Repository: tsawler/go-microservices Branch: main Commit: 301cd369d529 Files: 97 Total size: 300.5 KB Directory structure: gitextract_w41isflk/ ├── .gitignore ├── Caddyfile ├── LICENSE.md ├── Makefile ├── README.md ├── authentication-service/ │ ├── cmd/ │ │ └── api/ │ │ ├── discover.go │ │ ├── handlers.go │ │ ├── helpers.go │ │ ├── main.go │ │ └── routes.go │ ├── data/ │ │ └── models.go │ ├── go.mod │ ├── go.sum │ └── users.sql ├── authentication-service.dockerfile ├── broker-service/ │ ├── Makefile │ ├── cmd/ │ │ └── api/ │ │ ├── discover.go │ │ ├── handlers.go │ │ ├── helpers.go │ │ ├── main.go │ │ └── routes.go │ ├── event/ │ │ ├── emitter.go │ │ └── event.go │ ├── go.mod │ ├── go.sum │ └── logs/ │ ├── logs.pb.go │ ├── logs.proto │ └── logs_grpc.pb.go ├── broker-service.dockerfile ├── caddy.dockerfile ├── db-data/ │ ├── .gitignore │ └── .gitkeep ├── docker-compose.yml ├── front-end/ │ ├── cmd/ │ │ └── web/ │ │ ├── main.go │ │ └── templates/ │ │ ├── base.layout.gohtml │ │ ├── footer.partial.gohtml │ │ ├── header.partial.gohtml │ │ └── test.page.gohtml │ └── go.mod ├── front-end.dockerfile ├── ingress.yml ├── k8s/ │ ├── authentication.yml │ ├── broker.yml │ ├── listener.yml │ ├── logger.yml │ ├── mail.yml │ ├── mailhog.yml │ ├── mongo.yml │ └── rabbitmq.yml ├── k8s.md ├── listener-service/ │ ├── go.mod │ ├── go.sum │ ├── lib/ │ │ └── event/ │ │ ├── consumer.go │ │ └── event.go │ └── main.go ├── listener-service.dockerfile ├── logger-service/ │ ├── Makefile │ ├── cmd/ │ │ └── web/ │ │ ├── discover.go │ │ ├── grpc.go │ │ ├── handlers.go │ │ ├── helpers.go │ │ ├── main.go │ │ ├── middleware.go │ │ ├── render.go │ │ ├── routes.go │ │ └── rpc.go │ ├── data/ │ │ └── models.go │ ├── go.mod │ ├── go.sum │ ├── logs/ │ │ ├── logs.pb.go │ │ ├── logs.proto │ │ ├── logs_grpc.pb.go │ │ └── readme.md │ └── templates/ │ ├── base.layout.gohtml │ ├── dashboard.page.gohtml │ ├── entry.page.gohtml │ └── login.page.gohtml ├── logger-service.dockerfile ├── mail-service/ │ ├── cmd/ │ │ └── api/ │ │ ├── discover.go │ │ ├── handlers.go │ │ ├── helpers.go │ │ ├── mailer.go │ │ ├── main.go │ │ └── routes.go │ ├── go.mod │ ├── go.sum │ └── templates/ │ ├── mail.html.tmpl │ └── mail.plain.tmpl ├── mail-service.dockerfile ├── multistage-dockerfiles/ │ ├── authentication-service.dockerfile │ ├── broker-service.dockerfile │ ├── listener-service.dockerfile │ ├── logger-service.dockerfile │ └── mail-service.dockerfile ├── postgres.yml ├── swarm.md └── swarm.yml ================================================ FILE CONTENTS ================================================ ================================================ FILE: .gitignore ================================================ .idea .vscode coverage.out frontApp logServiceApp mailerServiceApp authApp brokerApp listener frontEndLinux ================================================ FILE: Caddyfile ================================================ { email you@gmail.com } (static) { @static { file path *.ico *.css *.js *.gif *.jpg *.jpeg *.png *.svg *.woff *.json } header @static Cache-Control max-age=5184000 } (security) { header { # enable HSTS Strict-Transport-Security max-age=31536000; # disable clients from sniffing the media type X-Content-Type-Options nosniff # keep referrer data off of HTTP connections Referrer-Policy no-referrer-when-downgrade } } localhost:80 { encode zstd gzip import static reverse_proxy http://front-end:8081 } backend:80 { reverse_proxy http://broker-service:8080 } ================================================ FILE: LICENSE.md ================================================ # MIT License ### Copyright (c) 2022 Trevor Sawler Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ================================================ FILE: Makefile ================================================ FRONT_END_BINARY=frontApp LOGGER_BINARY=logServiceApp BROKER_BINARY=brokerApp AUTH_BINARY=authApp LISTENER_BINARY=listener MAIL_BINARY=mailerServiceApp AUTH_VERSION=1.0.0 BROKER_VERSION=1.0.0 LISTENER_VERSION=1.0.2 MAIL_VERSION=1.0.0 LOGGER_VERSION=1.0.0 ## up: starts all containers in the background without forcing build up: @echo "Starting docker images..." docker-compose up -d @echo "Docker images started!" ## down: stop docker compose down: @echo "Stopping docker images..." docker-compose down @echo "Docker stopped!" ## build_dockerfiles: builds all dockerfile images build_dockerfiles: build_auth build_broker build_listener build_logger build_mail front_end_linux @echo "Building dockerfiles..." docker build -f front-end.dockerfile -t tsawler/front-end . docker build -f authentication-service.dockerfile -t tsawler/authentication:${AUTH_VERSION} . docker build -f broker-service.dockerfile -t tsawler/broker:1.0.0 . docker build -f listener-service.dockerfile -t tsawler/listener:1.0.2 . docker build -f mail-service.dockerfile -t tsawler/mail:1.0.0 . docker build -f logger-service.dockerfile -t tsawler/logger:1.0.0 . ## push_dockerfiles: pushes tagged versions to docker hub push_dockerfiles: build_dockerfiles docker push tsawler/authentication:${AUTH_VERSION} docker push tsawler/broker:${BROKER_VERSION} docker push tsawler/listener:${LISTENER_VERSION} docker push tsawler/mail:${MAIL_VERSION} docker push tsawler/logger:${LOGGER_VERSION} @echo "Done!" ## front_end_linux: builds linux executable for front end front_end_linux: @echo "Building linux version of front end..." cd front-end && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o frontEndLinux ./cmd/web @echo "Done!" ## swarm_up: starts the swarm swarm_up: @echo "Starting swarm..." docker stack deploy -c swarm.yml myapp ## swarm_down: stops the swarm swarm_down: @echo "Stopping swarm..." docker stack rm myapp ## build_auth: builds the authentication binary as a linux executable build_auth: @echo "Building authentication binary.." cd authentication-service && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ${AUTH_BINARY} ./cmd/api @echo "Authentication binary built!" ## build_logger: builds the logger binary as a linux executable build_logger: @echo "Building logger binary..." cd logger-service && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ${LOGGER_BINARY} ./cmd/web @echo "Logger binary built!" ## build_broker: builds the broker binary as a linux executable build_broker: @echo "Building broker binary..." cd broker-service && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ${BROKER_BINARY} ./cmd/api @echo "Broker binary built!" ## build_listener: builds the listener binary as a linux executable build_listener: @echo "Building listener binary..." cd listener-service && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ${LISTENER_BINARY} . @echo "Listener binary built!" ## build_mail: builds the mail binary as a linux executable build_mail: @echo "Building mailer binary..." cd mail-service && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o ${MAIL_BINARY} ./cmd/api @echo "Mailer binary built!" ## up_build: stops docker-compose (if running), builds all projects and starts docker compose up_build: build_auth build_broker build_listener build_logger build_mail @echo "Stopping docker images (if running...)" docker-compose down @echo "Building (when required) and starting docker images..." docker-compose up --build -d @echo "Docker images built and started!" ## auth: stops authentication-service, removes docker image, builds service, and starts it auth: build_auth @echo "Building authentication-service docker image..." - docker-compose stop authentication-service - docker-compose rm -f authentication-service docker-compose up --build -d authentication-service docker-compose start authentication-service @echo "authentication-service built and started!" ## broker: stops broker-service, removes docker image, builds service, and starts it broker: build_broker @echo "Building broker-service docker image..." - docker-compose stop broker-service - docker-compose rm -f broker-service docker-compose up --build -d broker-service docker-compose start broker-service @echo "broker-service rebuilt and started!" ## logger: stops logger-service, removes docker image, builds service, and starts it logger: build_logger @echo "Building logger-service docker image..." - docker-compose stop logger-service - docker-compose rm -f logger-service docker-compose up --build -d logger-service docker-compose start logger-service @echo "broker-service rebuilt and started!" ## mail: stops mail-service, removes docker image, builds service, and starts it mail: build_mail @echo "Building mail-service docker image..." - docker-compose stop mail-service - docker-compose rm -f mail-service docker-compose up --build -d mail-service docker-compose start mail-service @echo "mail-service rebuilt and started!" ## listener: stops listener-service, removes docker image, builds service, and starts it listener: build_listener @echo "Building listener-service docker image..." - docker-compose stop listener-service - docker-compose rm -f listener-service docker-compose up --build -d listener-service docker-compose start listener-service @echo "listener-service rebuilt and started!" ## start: starts the front end start: @echo "Starting front end" cd front-end && go build -o ${FRONT_END_BINARY} ./cmd/web cd front-end && ./${FRONT_END_BINARY} & ## stop: stop the front end stop: @echo "Stopping front end..." @-pkill -SIGTERM -f "./${FRONT_END_BINARY}" @echo "Stopped front end!" ## test: runs all tests test: @echo "Testing..." go test -v ./... ## clean: runs go clean and deletes binaries clean: @echo "Cleaning..." @cd broker-service && rm -f ${BROKER_BINARY} @cd broker-service && go clean @cd listener-service && rm -f ${LISTENER_BINARY} @cd listener-service && go clean @cd authentication-service && rm -f ${AUTH_BINARY} @cd authentication-service && go clean @cd mail-service && rm -f ${MAIL_BINARY} @cd mail-service && go clean @cd logger-service && rm -f ${LOGGER_BINARY} @cd logger-service && go clean @cd front-end && go clean @cd front-end && rm -f ${FRONT_END_BINARY} @echo "Cleaned!" ## help: displays help help: Makefile @echo " Choose a command:" @sed -n 's/^##//p' $< | column -t -s ':' | sed -e 's/^/ /' ================================================ FILE: README.md ================================================ [![Version](https://img.shields.io/badge/goversion-1.18.x-blue.svg)](https://golang.org) [![License](http://img.shields.io/badge/license-mit-blue.svg?style=flat-square)](https://raw.githubusercontent.com/tsawler/goblender/master/LICENSE) # Working with Microservices in Go This is the source code for the Udemy course **Working with Microservices and Go**. This project consists of a number of loosely coupled microservices, all written in Go: - broker-service: an optional single entry point to connect to all services from one place (accepts JSON; sends JSON, makes calls via gRPC, and pushes to RabbitMQ) - authentication-service: authenticates users against a Postgres database (accepts JSON) - logger-service: logs important events to a MongoDB database (accepts RPC, gRPC, and JSON) - queue-listener-service: consumes messages from amqp (RabbitMQ) and initiates actions based on payload (sends via RPC) - mail-service: sends email (accepts JSON) All services (except the broker) register their access urls with etcd, and renew their leases automatically. This allows us to implement a simple service discovery system, where all service URLs are accessible with "service maps" in the Config type used to share application configuration in the broker service. In addition to the microservices, the included `docker-compose.yml` at the root level of the project starts the following services: - Postgresql - used by the authentication service to store user accounts - MongoDB - used by the logger service to save logs from all services - etcd - used for service discovery - mailhog - used as a fake mail server to work with the mail service ## Running the project From the root level of the project, execute this command (this assumes that you have [GNU make](https://www.gnu.org/software/make/) and a recent version of [Docker](https://www.docker.com/products/docker-desktop) installed on your machine): ~~~ make up_build ~~~ If the code has not changed, subsequent runs can just be `make up`. Then start the front end: ~~~ make start ~~~ Hit the front end with your web browser at `http://localhost:80`. You can also access a web front end to the logger service by going to `http://localhost:8082` (or whatever port you specify in the `docker-compose.yml file`). To stop everything: ~~~ make stop make down ~~~ While working on code, you can rebuild just the service you are working on by executing `make auth` Where `auth` is one of the services: - auth - broker - logger - listener - mail All make commands: ~~~ tcs@Grendel go-microservices % make help Choose a command: up starts all containers in the background without forcing build down stop docker compose build_auth builds the authentication binary as a linux executable build_logger builds the logger binary as a linux executable build_broker builds the broker binary as a linux executable build_listener builds the listener binary as a linux executable build_mail builds the mail binary as a linux executable up_build stops docker-compose (if running), builds all projects and starts docker compose auth stops authentication-service, removes docker image, builds service, and starts it broker stops broker-service, removes docker image, builds service, and starts it logger stops logger-service, removes docker image, builds service, and starts it mail stops mail-service, removes docker image, builds service, and starts it listener stops listener-service, removes docker image, builds service, and starts it start starts the front end stop stop the front end test runs all tests clean runs go clean and deletes binaries help displays help ~~~ ================================================ FILE: authentication-service/cmd/api/discover.go ================================================ package main // //// registerService registers the correct entry for this service in etcd //func (app *Config) registerService() { // cli, _ := connectToEtcd() // kv := clientv3.NewKV(cli) // // app.Etcd = cli // // lease := clientv3.NewLease(cli) // grantResp, err := lease.Grant(context.TODO(), 10) // if err != nil { // log.Println("Error creating lease", err) // } // // // insert something with the lease // _, err = kv.Put(context.TODO(), fmt.Sprintf("/auth/%s", app.randomString(32)), "authentication-service", clientv3.WithLease(grantResp.ID)) // if err != nil { // log.Println("Error inserting using lease", err) // } // // // keep lease alive // kalRes, err := lease.KeepAlive(context.TODO(), grantResp.ID) // if err != nil { // log.Println("Error with keepalive", err) // } // go app.listenToKeepAlive(kalRes) //} // //// listenToKeepAlive just consumes channel responses from etcd's KeepAlive method //func (app *Config) listenToKeepAlive(kalRes <-chan *clientv3.LeaseKeepAliveResponse) { // defer func() { // if r := recover(); r != nil { // log.Println("Error", fmt.Sprintf("%v", r)) // } // }() // // // the only reason this exists is to consume the response from etcd's KeepAlive, because // // if we don't, unexpected behaviour is the result. // for { // _ = <-kalRes // } //} // //// connectToEtcd tries to connect to etcd, for up to 30 seconds //func connectToEtcd() (*clientv3.Client, error) { // var cli *clientv3.Client // var counts = 0 // // for { // c, err := clientv3.New(clientv3.Config{Endpoints: []string{"etcd:2379"}, // DialTimeout: 5 * time.Second, // }) // if err != nil { // fmt.Println("etcd not ready...") // counts++ // } else { // fmt.Println() // cli = c // break // } // // if counts > 15 { // return nil, err // } // fmt.Println("Backing off for 2 seconds...") // time.Sleep(2 * time.Second) // continue // } // log.Println("Connected to etcd!") // return cli, nil //} ================================================ FILE: authentication-service/cmd/api/handlers.go ================================================ package main import ( "bytes" "encoding/json" "errors" "fmt" "net/http" ) // Authenticate accepts a json payload and attempts to authenticate a user func (app *Config) Authenticate(w http.ResponseWriter, r *http.Request) { var requestPayload struct { Email string `json:"email"` Password string `json:"password"` } err := app.readJSON(w, r, &requestPayload) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) return } // validate against database user, err := app.Models.User.GetByEmail(requestPayload.Email) if err != nil { _ = app.errorJSON(w, errors.New("invalid credentials"), http.StatusUnauthorized) return } valid, err := user.PasswordMatches(requestPayload.Password) if err != nil || !valid { _ = app.errorJSON(w, errors.New("invalid credentials"), http.StatusUnauthorized) return } // log request err = app.logRequest("authentication", fmt.Sprintf("%s logged in", user.Email)) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) } payload := jsonResponse{ Error: false, Message: fmt.Sprintf("Logged in user %s", requestPayload.Email), //Data: User{ // ID: 1, // FirstName: "Jack", // LastName: "Smith", // Email: "jack@smith.com", // Active: 1, //}, Data: user, } _ = app.writeJSON(w, http.StatusAccepted, payload) } func (app *Config) logRequest(name, data string) error { var entry struct { Name string `json:"name"` Data string `json:"data"` } entry.Name = name entry.Data = data jsonData, _ := json.MarshalIndent(entry, "", "\t") logServiceURL := "http://logger-service/log" request, err := http.NewRequest("POST", logServiceURL, bytes.NewBuffer(jsonData)) request.Header.Set("Content-Type", "application/json") client := &http.Client{} _, err = client.Do(request) if err != nil { return err } return nil } ================================================ FILE: authentication-service/cmd/api/helpers.go ================================================ package main import ( "crypto/rand" "encoding/json" "errors" "io" "net/http" ) const randomStringSource = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0987654321_+" // jsonResponse is the type used for sending JSON around type jsonResponse struct { Error bool `json:"error"` Message string `json:"message"` Data any `json:"data,omitempty"` } // readJSON tries to read the body of a request and converts it into JSON func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error { maxBytes := 1048576 // one megabyte r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes)) dec := json.NewDecoder(r.Body) err := dec.Decode(data) if err != nil { return err } err = dec.Decode(&struct{}{}) if err != io.EOF { return errors.New("body must have only a single json value") } return nil } // writeJSON takes a response status code and arbitrary data and writes a json response to the client func (app *Config) writeJSON(w http.ResponseWriter, status int, data any, headers ...http.Header) error { out, err := json.Marshal(data) if err != nil { return err } if len(headers) > 0 { for key, value := range headers[0] { w.Header()[key] = value } } w.Header().Set("Content-Type", "application/json") w.WriteHeader(status) _, err = w.Write(out) if err != nil { return err } return nil } // errorJSON takes an error, and optionally a response status code, and generates and sends // a json error response func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error { statusCode := http.StatusBadRequest if len(status) > 0 { statusCode = status[0] } var payload jsonResponse payload.Error = true payload.Message = err.Error() return app.writeJSON(w, statusCode, payload) } // randomString returns a random string of letters of length n func (app *Config) randomString(n int) string { s, r := make([]rune, n), []rune(randomStringSource) for i := range s { p, _ := rand.Prime(rand.Reader, len(r)) x, y := p.Uint64(), uint64(len(r)) s[i] = r[x%y] } return string(s) } ================================================ FILE: authentication-service/cmd/api/main.go ================================================ package main import ( "authentication/data" "database/sql" "fmt" _ "github.com/jackc/pgconn" _ "github.com/jackc/pgx/v4" _ "github.com/jackc/pgx/v4/stdlib" "log" "net/http" "os" "time" ) const webPort = "80" var counts int64 type Config struct { DB *sql.DB Models data.Models //Etcd *clientv3.Client } func main() { log.Println("---------------------------------------------") log.Println("Attempting to connect to Postgres...") // connect to the database conn := connectToDB() if conn == nil { log.Panic("can't connect to postgres!") } app := Config{ DB: conn, Models: data.New(conn), } //app.registerService() //defer app.Etcd.Close() srv := &http.Server{ Addr: fmt.Sprintf(":%s", webPort), Handler: app.routes(), } log.Printf("Starting authentication end service on port %s\n", webPort) err := srv.ListenAndServe() if err != nil { log.Panic(err) } } func connectToDB() *sql.DB { // connect to postgres dsn := os.Getenv("DSN") for { connection, err := openDB(dsn) if err != nil { log.Println("Postgres not ready...") counts++ } else { log.Println("Connected to database!") return connection } if counts > 10 { log.Println(err) return nil } log.Println("Backing off for two seconds...") time.Sleep(2 * time.Second) continue } } func openDB(dsn string) (*sql.DB, error) { db, err := sql.Open("pgx", dsn) if err != nil { return nil, err } err = db.Ping() if err != nil { return nil, err } return db, nil } ================================================ FILE: authentication-service/cmd/api/routes.go ================================================ package main import ( "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-chi/cors" "net/http" ) func (app *Config) routes() http.Handler { mux := chi.NewRouter() // specify who is allowed to connect to our API service mux.Use(cors.Handler(cors.Options{ AllowedOrigins: []string{"*"}, AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}, AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, ExposedHeaders: []string{"Link"}, AllowCredentials: true, MaxAge: 300, })) mux.Use(middleware.Heartbeat("/ping")) mux.Post("/authenticate", app.Authenticate) return mux } ================================================ FILE: authentication-service/data/models.go ================================================ package data import ( "context" "database/sql" "errors" "log" "time" "golang.org/x/crypto/bcrypt" ) const dbTimeout = time.Second * 3 var db *sql.DB // New is the function used to create an instance of the data package. It returns the type // Model, which embeds all the types we want to be available to our application. func New(dbPool *sql.DB) Models { db = dbPool return Models{ User: User{}, } } // Models is the type for this package. Note that any model that is included as a member // in this type is available to us throughout the application, anywhere that the // app variable is used, provided that the model is also added in the New function. type Models struct { User User } // User is the structure which holds one user from the database. type User struct { ID int `json:"id"` Email string `json:"email"` FirstName string `json:"first_name,omitempty"` LastName string `json:"last_name,omitempty"` Password string `json:"-"` Active int `json:"active"` CreatedAt time.Time `json:"created_at"` UpdatedAt time.Time `json:"updated_at"` } // GetAll returns a slice of all users, sorted by last name func (u *User) GetAll() ([]*User, error) { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at from users order by last_name` rows, err := db.QueryContext(ctx, query) if err != nil { return nil, err } defer rows.Close() var users []*User for rows.Next() { var user User err := rows.Scan( &user.ID, &user.Email, &user.FirstName, &user.LastName, &user.Password, &user.Active, &user.CreatedAt, &user.UpdatedAt, ) if err != nil { log.Println("Error scanning", err) return nil, err } users = append(users, &user) } return users, nil } // GetByEmail returns one user by email func (u *User) GetByEmail(email string) (*User, error) { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at from users where email = $1` var user User row := db.QueryRowContext(ctx, query, email) err := row.Scan( &user.ID, &user.Email, &user.FirstName, &user.LastName, &user.Password, &user.Active, &user.CreatedAt, &user.UpdatedAt, ) if err != nil { return nil, err } return &user, nil } // GetOne returns one user by id func (u *User) GetOne(id int) (*User, error) { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at from users where id = $1` var user User row := db.QueryRowContext(ctx, query, id) err := row.Scan( &user.ID, &user.Email, &user.FirstName, &user.LastName, &user.Password, &user.Active, &user.CreatedAt, &user.UpdatedAt, ) if err != nil { return nil, err } return &user, nil } // Update updates one user in the database, using the information // stored in the receiver u func (u *User) Update() error { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() stmt := `update users set email = $1, first_name = $2, last_name = $3, user_active = $4, updated_at = $5 where id = $6 ` _, err := db.ExecContext(ctx, stmt, u.Email, u.FirstName, u.LastName, u.Active, time.Now(), u.ID, ) if err != nil { return err } return nil } // Delete deletes one user from the database, by User.ID func (u *User) Delete() error { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() stmt := `delete from users where id = $1` _, err := db.ExecContext(ctx, stmt, u.ID) if err != nil { return err } return nil } // DeleteByID deletes one user from the database, by ID func (u *User) DeleteByID(id int) error { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() stmt := `delete from users where id = $1` _, err := db.ExecContext(ctx, stmt, id) if err != nil { return err } return nil } // Insert inserts a new user into the database, and returns the ID of the newly inserted row func (u *User) Insert(user User) (int, error) { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() hashedPassword, err := bcrypt.GenerateFromPassword([]byte(user.Password), 12) if err != nil { return 0, err } var newID int stmt := `insert into users (email, first_name, last_name, password, user_active, created_at, updated_at) values ($1, $2, $3, $4, $5, $6, $7) returning id` err = db.QueryRowContext(ctx, stmt, user.Email, user.FirstName, user.LastName, hashedPassword, user.Active, time.Now(), time.Now(), ).Scan(&newID) if err != nil { return 0, err } return newID, nil } // ResetPassword is the method we will use to change a user's password. func (u *User) ResetPassword(password string) error { ctx, cancel := context.WithTimeout(context.Background(), dbTimeout) defer cancel() hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 12) if err != nil { return err } stmt := `update users set password = $1 where id = $2` _, err = db.ExecContext(ctx, stmt, hashedPassword, u.ID) if err != nil { return err } return nil } // PasswordMatches uses Go's bcrypt package to compare a user supplied password // with the hash we have stored for a given user in the database. If the password // and hash match, we return true; otherwise, we return false. func (u *User) PasswordMatches(plainText string) (bool, error) { err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(plainText)) if err != nil { switch { case errors.Is(err, bcrypt.ErrMismatchedHashAndPassword): // invalid password return false, nil default: return false, err } } return true, nil } ================================================ FILE: authentication-service/go.mod ================================================ module authentication go 1.18 require ( github.com/go-chi/chi/v5 v5.0.8 github.com/go-chi/cors v1.2.1 github.com/jackc/pgconn v1.14.0 github.com/jackc/pgx/v4 v4.18.1 go.etcd.io/etcd/client/v3 v3.5.2 golang.org/x/crypto v0.6.0 ) require ( github.com/coreos/go-semver v0.3.0 // indirect github.com/coreos/go-systemd/v22 v22.3.2 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/jackc/chunkreader/v2 v2.0.1 // indirect github.com/jackc/pgio v1.0.0 // indirect github.com/jackc/pgpassfile v1.0.0 // indirect github.com/jackc/pgproto3/v2 v2.3.2 // indirect github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect github.com/jackc/pgtype v1.14.0 // indirect go.etcd.io/etcd/api/v3 v3.5.2 // indirect go.etcd.io/etcd/client/pkg/v3 v3.5.2 // indirect go.uber.org/atomic v1.9.0 // indirect go.uber.org/multierr v1.8.0 // indirect go.uber.org/zap v1.21.0 // indirect golang.org/x/net v0.6.0 // indirect golang.org/x/sys v0.5.0 // indirect golang.org/x/text v0.7.0 // indirect google.golang.org/genproto v0.0.0-20220328150716-24ca77f39d1f // indirect google.golang.org/grpc v1.45.0 // indirect google.golang.org/protobuf v1.28.0 // indirect ) ================================================ FILE: authentication-service/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod 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gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s= gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= ================================================ FILE: authentication-service/users.sql ================================================ -- -- Name: user_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.user_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.user_id_seq OWNER TO postgres; SET default_tablespace = ''; SET default_table_access_method = heap; -- -- Name: users; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.users ( id integer DEFAULT nextval('public.user_id_seq'::regclass) NOT NULL, email character varying(255), first_name character varying(255), last_name character varying(255), password character varying(60), user_active integer DEFAULT 0, created_at timestamp without time zone, updated_at timestamp without time zone ); ALTER TABLE public.users OWNER TO postgres; -- -- Name: user_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.user_id_seq', 1, true); -- -- Name: users users_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.users ADD CONSTRAINT users_pkey PRIMARY KEY (id); INSERT INTO "public"."users"("email","first_name","last_name","password","user_active","created_at","updated_at") VALUES (E'admin@example.com',E'Admin',E'User',E'$2a$12$1zGLuYDDNvATh4RA4avbKuheAMpb1svexSzrQm7up.bnpwQHs0jNe',1,E'2022-03-14 00:00:00',E'2022-03-14 00:00:00'); ================================================ FILE: authentication-service.dockerfile ================================================ FROM alpine:latest RUN mkdir /app COPY authentication-service/authApp /app # Run the server executable CMD [ "/app/authApp" ] ================================================ FILE: broker-service/Makefile ================================================ gen: protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative logs/logs.proto ================================================ FILE: broker-service/cmd/api/discover.go ================================================ package main import ( "fmt" clientv3 "go.etcd.io/etcd/client/v3" "time" ) //func (app *Config) getServiceURLs() { // kv := clientv3.NewKV(app.Etcd) // app.MailServiceURLs = make(map[string]string) // app.LogServiceURLs = make(map[string]string) // app.AuthServiceURLs = make(map[string]string) // // prefixes := []string{"/mail/", "/logger/", "/auth/"} // // // range through all the services we want to discover // for _, curPrefix := range prefixes { // getResp, err := kv.Get(context.TODO(), curPrefix, clientv3.WithPrefix()) // if err != nil { // log.Println(err) // } // // for _, k := range getResp.Kvs { // //log.Println("Key", string(k.Key)) // //log.Println("Adding", string(k.Value), "to", curPrefix, "service map; key was", string(k.Key)) // switch curPrefix { // case "/mail/": // app.MailServiceURLs[string(k.Value)] = "" // case "/logger/": // app.LogServiceURLs[string(k.Value)] = "" // case "/auth/": // app.AuthServiceURLs[string(k.Value)] = "" // } // } // } //} // watchEtcd runs in the background, looking for changes in etcd. When it finds changes // hosts, it updates the appropriate map in the *Config receiver. //func (app *Config) watchEtcd() { // for { // // watch for service changes // watchKey := app.Etcd.Watch(context.Background(), "/mail/", clientv3.WithPrefix()) // for resp := range watchKey { // for _, item := range resp.Events { // // get our values as strings so that we can work with them // eventType := item.Type.String() // key := string(item.Kv.Key) // value := string(item.Kv.Value) // var deleteURL = false // if strings.Contains(eventType, "DELETE") { // deleteURL = true // } // // // add to or remove from service maps (using url as key, and empty string as value) // switch { // case strings.HasPrefix(key, "mail"): // // mail // if deleteURL { // log.Println("Removing", value, "from mail service map") // delete(app.MailServiceURLs, key) // } else { // log.Println("Adding", value, "to mail service map") // app.MailServiceURLs[value] = "" // } // // case strings.HasPrefix(key, "logger"): // // logger // if deleteURL { // delete(app.LogServiceURLs, key) // } else { // app.LogServiceURLs[value] = "" // } // // case strings.HasPrefix(key, "auth"): // // authentication // if deleteURL { // delete(app.AuthServiceURLs, key) // } else { // app.AuthServiceURLs[value] = "" // } // } // } // } // } //} // GetServiceURL will get a service's url from those listed as available in etcd //func (app *Config) GetServiceURL(serviceType string) string { // var serviceURL string // // // get service URL from etcd // switch serviceType { // case "mail": // serviceURL = getUrlFromMap(app.MailServiceURLs) // case "logger": // serviceURL = getUrlFromMap(app.LogServiceURLs) // case "auth": // serviceURL = getUrlFromMap(app.AuthServiceURLs) // } // // return serviceURL //} // getUrlFromMap returns a random value from available urls in // service maps. Since maps are never guaranteed to be in the same order, // grabbing the first value is sufficient for our purposes. func getUrlFromMap(m map[string]string) string { var u string for k := range m { u = k break } return u } // connectToEtcd tries to connect to etcd, for up to 30 seconds func connectToEtcd() (*clientv3.Client, error) { var cli *clientv3.Client var counts = 0 for { c, err := clientv3.New(clientv3.Config{Endpoints: []string{"etcd:2379"}, DialTimeout: 5 * time.Second, }) if err != nil { fmt.Println("etcd not ready...") counts++ } else { fmt.Println() cli = c break } if counts > 15 { return nil, err } fmt.Println("Backing off for 2 seconds...") time.Sleep(2 * time.Second) continue } fmt.Println("Connected to etcd!") return cli, nil } ================================================ FILE: broker-service/cmd/api/handlers.go ================================================ package main import ( "broker/event" "broker/logs" "bytes" "context" "encoding/json" "errors" "fmt" "google.golang.org/grpc" "google.golang.org/grpc/credentials/insecure" "log" "net/http" "net/rpc" "time" ) const loggerGRPCAddress = "logger-service:50001" // Payload is the type for data we push into RabbitMQ type Payload struct { Name string `json:"name"` Data any `json:"data"` } // RequestPayload is the type describing the data that we received // from the user's browser. We embed a custom type for each of the // possible payloads (mail, auth, and log). type RequestPayload struct { Action string `json:"action"` Mail MailPayload `json:"mail,omitempty"` Auth AuthPayload `json:"auth,omitempty"` Log LogPayload `json:"log,omitempty"` } // AuthPayload is the type embedded in RequestPayload for auth type AuthPayload struct { Email string `json:"email"` Password string `json:"password"` } // LogPayload is the type embedded in RequestPayload for logging type LogPayload struct { Name string `json:"name"` Data string `json:"data"` } // MailPayload is the type embedded in RequestPayload for sending email type MailPayload struct { From string `json:"from"` To string `json:"to"` Subject string `json:"subject"` Message string `json:"message"` } // Broker is a simple test handler for the broker func (app *Config) Broker(w http.ResponseWriter, r *http.Request) { err := app.pushToQueue("broker_hit", r.RemoteAddr) if err != nil { log.Println(err) } var payload jsonResponse payload.Message = "Received request" out, _ := json.MarshalIndent(payload, "", "\t") w.Header().Set("Content-Type", "application/json") w.WriteHeader(http.StatusAccepted) _, _ = w.Write(out) } // HandleSubmission handles a JSON payload that describes an action to take, // processes it, and sends it where it needs to go func (app *Config) HandleSubmission(w http.ResponseWriter, r *http.Request) { var requestPayload RequestPayload err := app.readJSON(w, r, &requestPayload) if err != nil { _ = app.errorJSON(w, err) return } switch requestPayload.Action { case "mail": app.sendMail(w, requestPayload.Mail) case "auth": app.authenticate(w, requestPayload.Auth) case "log": app.logItemViaRPC(w, requestPayload.Log) default: _ = app.errorJSON(w, errors.New("unknown action")) } } func (app *Config) logViaJSON(w http.ResponseWriter, entry LogPayload) { jsonData, _ := json.MarshalIndent(entry, "", "\t") logServiceURL := "http://logger-service/log" request, err := http.NewRequest("POST", logServiceURL, bytes.NewBuffer(jsonData)) request.Header.Set("Content-Type", "application/json") client := &http.Client{} response, err := client.Do(request) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) return } defer response.Body.Close() // make sure we get back the right status code if response.StatusCode != http.StatusAccepted { _ = app.errorJSON(w, errors.New("error calling logger service"), http.StatusBadRequest) return } // send json back to our end user var payload jsonResponse payload.Error = false payload.Message = "Logged!" _ = app.writeJSON(w, http.StatusAccepted, payload) } // sendMail sends an email through the mail-service. It receives a json payload // of type requestPayload, with MailPayload embedded. func (app *Config) sendMail(w http.ResponseWriter, msg MailPayload) { jsonData, _ := json.MarshalIndent(msg, "", "\t") // call the mail service; we need a request, so let's build one, and populate // its body with the jsonData we just created. First we get the correct server // to call from our service map. //mailServiceURL := fmt.Sprintf("http://%s/send", app.GetServiceURL("mail")) mailServiceURL := fmt.Sprintf("http://%s/send", "mail-service") // now post to the mail service request, err := http.NewRequest("POST", mailServiceURL, bytes.NewBuffer(jsonData)) request.Header.Set("Content-Type", "application/json") client := &http.Client{} response, err := client.Do(request) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) return } defer response.Body.Close() // make sure we get back the right status code if response.StatusCode != http.StatusAccepted { _ = app.errorJSON(w, errors.New("error calling mail service"), http.StatusBadRequest) return } // send json back to our end user var payload jsonResponse payload.Error = false payload.Message = "Message sent to " + msg.To out, _ := json.MarshalIndent(payload, "", "\t") w.Header().Set("Content-Type", "application/json") w.WriteHeader(http.StatusAccepted) _, _ = w.Write(out) } // authenticate tries to log a user in through the authentication-service. It receives a json payload // of type requestPayload, with AuthPayload embedded. func (app *Config) authenticate(w http.ResponseWriter, a AuthPayload) { // create json we'll send to the authentication-service jsonData, _ := json.MarshalIndent(a, "", "\t") // call the authentication-service; we need a request, so let's build one, and populate // its body with the jsonData we just created. First we get the correct url for our // auth service from our service map. //authServiceURL := fmt.Sprintf("http://%s/authenticate", app.GetServiceURL("auth")) authServiceURL := fmt.Sprintf("http://%s/authenticate", "authentication-service") // now build the request and set header request, err := http.NewRequest("POST", authServiceURL, bytes.NewBuffer(jsonData)) request.Header.Set("Content-Type", "application/json") // call the service client := &http.Client{} response, err := client.Do(request) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) return } defer response.Body.Close() // make sure we get back the right status code if response.StatusCode == http.StatusUnauthorized { _ = app.errorJSON(w, errors.New("invalid credentials"), http.StatusUnauthorized) return } else if response.StatusCode != http.StatusAccepted { _ = app.errorJSON(w, errors.New("error calling auth service"), http.StatusBadRequest) return } // create variable we'll read the response.Body from the authentication-service into var jsonFromService jsonResponse // decode the json we get from the authentication-service into our variable err = json.NewDecoder(response.Body).Decode(&jsonFromService) if err != nil { _ = app.errorJSON(w, err, http.StatusBadRequest) return } // did not authenticate successfully if jsonFromService.Error { // log it _ = app.pushToQueue("authentication", fmt.Sprintf("invalid login for %s", a.Email)) // send error JSON back _ = app.errorJSON(w, err, http.StatusUnauthorized) return } // valid login, so send it to the logger service via RabbitMQ _ = app.pushToQueue("authentication", fmt.Sprintf("valid login for %s", a.Email)) // send json back to our end user, with user info embedded var payload jsonResponse payload.Error = false payload.Message = "Authenticated!" payload.Data = jsonFromService.Data _ = app.writeJSON(w, http.StatusAccepted, payload) } // logItem logs an event using the logger-service. It makes the call by pushing the data to RabbitMQ. func (app *Config) logItem(w http.ResponseWriter, l LogPayload) { err := app.pushToQueue(l.Name, l.Data) if err != nil { log.Println(err) _ = app.errorJSON(w, err) } // send json back to our end user var payload jsonResponse payload.Error = false payload.Message = "logged" _ = app.writeJSON(w, http.StatusAccepted, payload) } type RPCPayload struct { Name string Data string } func (app *Config) logItemViaRPC(w http.ResponseWriter, l LogPayload) { client, err := rpc.Dial("tcp", "logger-service:5001") if err != nil { app.errorJSON(w, err) return } rpcPayload := RPCPayload{ Name: l.Name, Data: l.Data, } var result string err = client.Call("RPCServer.LogInfo", rpcPayload, &result) if err != nil { app.errorJSON(w, err) return } payload := jsonResponse{ Error: false, Message: result, } app.writeJSON(w, http.StatusAccepted, payload) } // pushToQueue pushes a message into RabbitMQ func (app *Config) pushToQueue(name, msg string) error { emitter, err := event.NewEventEmitter(app.Rabbit) if err != nil { log.Println(err) return err } payload := Payload{ Name: name, Data: msg, } j, _ := json.MarshalIndent(&payload, "", " ") err = emitter.Push(string(j), "log.INFO") if err != nil { return err } return nil } // LogViaGRPC takes a JSON payload and logs it using gRPC as the transport func (app *Config) LogViaGRPC(w http.ResponseWriter, r *http.Request) { var requestPayload RequestPayload err := app.readJSON(w, r, &requestPayload) if err != nil { _ = app.errorJSON(w, err) return } conn, err := grpc.Dial(loggerGRPCAddress, grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithBlock()) if err != nil { _ = app.errorJSON(w, err) return } defer conn.Close() c := logs.NewLogServiceClient(conn) ctx, cancel := context.WithTimeout(context.Background(), time.Second) defer cancel() _, err = c.WriteLog(ctx, &logs.LogRequest{ LogEntry: &logs.Log{ Name: requestPayload.Log.Name, Data: requestPayload.Log.Data, }, }) if err != nil { _ = app.errorJSON(w, err) return } var payload jsonResponse payload.Error = false payload.Message = "logged" _ = app.writeJSON(w, http.StatusAccepted, payload) } ================================================ FILE: broker-service/cmd/api/helpers.go ================================================ package main import ( "encoding/json" "errors" "io" "net/http" ) type jsonResponse struct { Error bool `json:"error"` Message string `json:"message"` Data any `json:"data,omitempty"` } // readJSON tries to read the body of a request and converts it into JSON func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error { maxBytes := 1048576 // one megabyte r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes)) dec := json.NewDecoder(r.Body) err := dec.Decode(data) if err != nil { return err } err = dec.Decode(&struct{}{}) if err != io.EOF { return errors.New("body must have only a single json value") } return nil } // writeJSON takes a response status code and arbitrary data and writes a json response to the client func (app *Config) writeJSON(w http.ResponseWriter, status int, data any, headers ...http.Header) error { out, err := json.Marshal(data) if err != nil { return err } if len(headers) > 0 { for key, value := range headers[0] { w.Header()[key] = value } } w.Header().Set("Content-Type", "application/json") w.WriteHeader(status) _, err = w.Write(out) if err != nil { return err } return nil } // errorJSON takes an error, and optionally a response status code, and generates and sends // a json error response func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error { statusCode := http.StatusBadRequest if len(status) > 0 { statusCode = status[0] } var payload jsonResponse payload.Error = true payload.Message = err.Error() return app.writeJSON(w, statusCode, payload) } ================================================ FILE: broker-service/cmd/api/main.go ================================================ package main import ( "errors" "fmt" amqp "github.com/rabbitmq/amqp091-go" clientv3 "go.etcd.io/etcd/client/v3" "log" "net/http" "os" "time" ) // webPort the port that we listen on for api calls const webPort = "80" // Config is the type we'll use as a receiver to share application // configuration around our app. type Config struct { Rabbit *amqp.Connection Etcd *clientv3.Client LogServiceURLs map[string]string //MailServiceURLs map[string]string //AuthServiceURLs map[string]string } func main() { // don't continue until rabbitmq is ready rabbitConn, err := connectToRabbit() if err != nil { fmt.Println(err) os.Exit(1) } defer rabbitConn.Close() // don't continue until etcd is ready //etcConn, err := connectToEtcd() //if err != nil { // fmt.Println(err) // os.Exit(1) //} //defer etcConn.Close() app := Config{ Rabbit: rabbitConn, //Etcd: etcConn, } // get service urls //app.getServiceURLs() // watch service urls //go app.watchEtcd() log.Println("Starting broker service on port", webPort) // define the http server srv := &http.Server{ Addr: fmt.Sprintf(":%s", webPort), Handler: app.routes(), } // start the server err = srv.ListenAndServe() if err != nil { log.Panic(err) } } // connectToRabbit tries to connect to RabbitMQ, for up to 30 seconds func connectToRabbit() (*amqp.Connection, error) { var rabbitConn *amqp.Connection var counts int64 var rabbitURL = os.Getenv("RABBIT_URL") for { connection, err := amqp.Dial(rabbitURL) if err != nil { fmt.Println("rabbitmq not ready...") counts++ } else { fmt.Println() rabbitConn = connection break } if counts > 15 { fmt.Println(err) return nil, errors.New("cannot connect to rabbit") } fmt.Println("Backing off for 2 seconds...") time.Sleep(2 * time.Second) continue } fmt.Println("Connected to RabbitMQ!") return rabbitConn, nil } ================================================ FILE: broker-service/cmd/api/routes.go ================================================ package main import ( "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-chi/cors" "net/http" ) func (app *Config) routes() http.Handler { mux := chi.NewRouter() // specify who is allowed to connect to our API service mux.Use(cors.Handler(cors.Options{ AllowedOrigins: []string{"https://*", "http://*"}, AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}, AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, ExposedHeaders: []string{"Link"}, AllowCredentials: true, MaxAge: 300, })) // a heartbeat route, to ensure things are up mux.Use(middleware.Heartbeat("/ping")) // this route is just to ensure things work, and is never // used after that mux.Get("/", app.Broker) mux.Post("/", app.Broker) // grpc route mux.Post("/log-grpc", app.LogViaGRPC) // a route for everything mux.Post("/handle", app.HandleSubmission) return mux } ================================================ FILE: broker-service/event/emitter.go ================================================ package event import ( "context" "log" amqp "github.com/rabbitmq/amqp091-go" ) // Emitter for publishing AMQP events type Emitter struct { connection *amqp.Connection } func (e *Emitter) setup() error { channel, err := e.connection.Channel() if err != nil { panic(err) } defer channel.Close() return declareExchange(channel) } // Push (Publish) a specified message to the AMQP exchange func (e *Emitter) Push(event string, severity string) error { channel, err := e.connection.Channel() if err != nil { return err } defer channel.Close() log.Println("Pushing to", getExchangeName()) err = channel.PublishWithContext( context.Background(), getExchangeName(), severity, false, false, amqp.Publishing{ ContentType: "text/plain", Body: []byte(event), }, ) if err != nil { log.Println(err) return err } log.Printf("Sending message: %s -> %s", event, getExchangeName()) return nil } // NewEventEmitter returns a new event.Emitter object // ensuring that the object is initialised, without error func NewEventEmitter(conn *amqp.Connection) (Emitter, error) { emitter := Emitter{ connection: conn, } err := emitter.setup() if err != nil { return Emitter{}, err } return emitter, nil } ================================================ FILE: broker-service/event/event.go ================================================ package event import ( amqp "github.com/rabbitmq/amqp091-go" ) func getExchangeName() string { return "logs_topic" } func declareExchange(ch *amqp.Channel) error { return ch.ExchangeDeclare( getExchangeName(), // name "topic", // type true, // durable false, // auto-deleted false, // internal false, // no-wait nil, // arguments ) } ================================================ FILE: broker-service/go.mod ================================================ module broker go 1.18 require ( github.com/go-chi/chi/v5 v5.0.8 github.com/go-chi/cors v1.2.1 github.com/rabbitmq/amqp091-go v1.7.0 go.etcd.io/etcd/client/v3 v3.5.7 google.golang.org/grpc v1.53.0 google.golang.org/protobuf v1.28.1 ) require ( github.com/coreos/go-semver v0.3.1 // indirect github.com/coreos/go-systemd/v22 v22.5.0 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect go.etcd.io/etcd/api/v3 v3.5.7 // indirect go.etcd.io/etcd/client/pkg/v3 v3.5.7 // indirect go.uber.org/atomic v1.10.0 // indirect go.uber.org/multierr v1.9.0 // indirect go.uber.org/zap v1.24.0 // indirect golang.org/x/net v0.7.0 // indirect golang.org/x/sys v0.5.0 // indirect golang.org/x/text v0.7.0 // indirect google.golang.org/genproto v0.0.0-20230301171018-9ab4bdc49ad5 // indirect ) ================================================ FILE: broker-service/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA= github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= github.com/beorn7/perks 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h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM= github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk= github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4= github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec= github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI= github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs= github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod 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v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8= github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0= github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/go-chi/cors v1.2.0 h1:tV1g1XENQ8ku4Bq3K9ub2AtgG+p16SmzeMSGTwrOKdE= github.com/go-chi/cors v1.2.0/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58= github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4= github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY= 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DO NOT EDIT. // versions: // protoc-gen-go v1.27.1 // protoc v3.19.4 // source: logs/logs.proto package logs import ( protoreflect "google.golang.org/protobuf/reflect/protoreflect" protoimpl "google.golang.org/protobuf/runtime/protoimpl" reflect "reflect" sync "sync" ) const ( // Verify that this generated code is sufficiently up-to-date. _ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion) // Verify that runtime/protoimpl is sufficiently up-to-date. _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20) ) type Log struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"` Data string `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"` } func (x *Log) Reset() { *x = Log{} if protoimpl.UnsafeEnabled { mi := &file_logs_logs_proto_msgTypes[0] ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms.StoreMessageInfo(mi) } } func (x *Log) String() string { return protoimpl.X.MessageStringOf(x) } func (*Log) ProtoMessage() {} func (x *Log) ProtoReflect() protoreflect.Message { mi := &file_logs_logs_proto_msgTypes[0] if protoimpl.UnsafeEnabled && x != nil { ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) if ms.LoadMessageInfo() == nil { ms.StoreMessageInfo(mi) } return ms } return mi.MessageOf(x) } // Deprecated: Use Log.ProtoReflect.Descriptor instead. func (*Log) Descriptor() ([]byte, []int) { return file_logs_logs_proto_rawDescGZIP(), []int{0} } func (x *Log) GetName() string { if x != nil { return x.Name } return "" } func (x *Log) GetData() string { if x != nil { return x.Data } return "" } type LogRequest struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields LogEntry *Log `protobuf:"bytes,1,opt,name=logEntry,proto3" json:"logEntry,omitempty"` } func (x *LogRequest) Reset() { *x = LogRequest{} if protoimpl.UnsafeEnabled { mi := &file_logs_logs_proto_msgTypes[1] ms := 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[]int32{ 0, // 0: logs.LogRequest.logEntry:type_name -> logs.Log 1, // 1: logs.LogService.WriteLog:input_type -> logs.LogRequest 2, // 2: logs.LogService.WriteLog:output_type -> logs.LogResponse 2, // [2:3] is the sub-list for method output_type 1, // [1:2] is the sub-list for method input_type 1, // [1:1] is the sub-list for extension type_name 1, // [1:1] is the sub-list for extension extendee 0, // [0:1] is the sub-list for field type_name } func init() { file_logs_logs_proto_init() } func file_logs_logs_proto_init() { if File_logs_logs_proto != nil { return } if !protoimpl.UnsafeEnabled { file_logs_logs_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*Log); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } file_logs_logs_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*LogRequest); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } file_logs_logs_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*LogResponse); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } } type x struct{} out := protoimpl.TypeBuilder{ File: protoimpl.DescBuilder{ GoPackagePath: reflect.TypeOf(x{}).PkgPath(), RawDescriptor: file_logs_logs_proto_rawDesc, NumEnums: 0, NumMessages: 3, NumExtensions: 0, NumServices: 1, }, GoTypes: file_logs_logs_proto_goTypes, DependencyIndexes: file_logs_logs_proto_depIdxs, MessageInfos: file_logs_logs_proto_msgTypes, }.Build() File_logs_logs_proto = out.File file_logs_logs_proto_rawDesc = nil file_logs_logs_proto_goTypes = nil file_logs_logs_proto_depIdxs = nil } ================================================ FILE: broker-service/logs/logs.proto ================================================ syntax = "proto3"; package logs; option go_package = "/logs"; message Log{ string name = 1; string data =2; } message LogRequest { Log logEntry = 1; } message LogResponse{ string result = 1; } service LogService{ rpc WriteLog(LogRequest) returns (LogResponse) {} } ================================================ FILE: broker-service/logs/logs_grpc.pb.go ================================================ // Code generated by protoc-gen-go-grpc. DO NOT EDIT. // versions: // - protoc-gen-go-grpc v1.2.0 // - protoc v3.19.4 // source: logs/logs.proto package logs import ( context "context" grpc "google.golang.org/grpc" codes "google.golang.org/grpc/codes" status "google.golang.org/grpc/status" ) // This is a compile-time assertion to ensure that this generated file // is compatible with the grpc package it is being compiled against. // Requires gRPC-Go v1.32.0 or later. const _ = grpc.SupportPackageIsVersion7 // LogServiceClient is the client API for LogService service. // // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream. type LogServiceClient interface { WriteLog(ctx context.Context, in *LogRequest, opts ...grpc.CallOption) (*LogResponse, error) } type logServiceClient struct { cc grpc.ClientConnInterface } func NewLogServiceClient(cc grpc.ClientConnInterface) LogServiceClient { return &logServiceClient{cc} } func (c *logServiceClient) WriteLog(ctx context.Context, in *LogRequest, opts ...grpc.CallOption) (*LogResponse, error) { out := new(LogResponse) err := c.cc.Invoke(ctx, "/logs.LogService/WriteLog", in, out, opts...) if err != nil { return nil, err } return out, nil } // LogServiceServer is the server API for LogService service. // All implementations must embed UnimplementedLogServiceServer // for forward compatibility type LogServiceServer interface { WriteLog(context.Context, *LogRequest) (*LogResponse, error) mustEmbedUnimplementedLogServiceServer() } // UnimplementedLogServiceServer must be embedded to have forward compatible implementations. type UnimplementedLogServiceServer struct { } func (UnimplementedLogServiceServer) WriteLog(context.Context, *LogRequest) (*LogResponse, error) { return nil, status.Errorf(codes.Unimplemented, "method WriteLog not implemented") } func (UnimplementedLogServiceServer) mustEmbedUnimplementedLogServiceServer() {} // UnsafeLogServiceServer may be embedded to opt out of forward compatibility for this service. // Use of this interface is not recommended, as added methods to LogServiceServer will // result in compilation errors. type UnsafeLogServiceServer interface { mustEmbedUnimplementedLogServiceServer() } func RegisterLogServiceServer(s grpc.ServiceRegistrar, srv LogServiceServer) { s.RegisterService(&LogService_ServiceDesc, srv) } func _LogService_WriteLog_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { in := new(LogRequest) if err := dec(in); err != nil { return nil, err } if interceptor == nil { return srv.(LogServiceServer).WriteLog(ctx, in) } info := &grpc.UnaryServerInfo{ Server: srv, FullMethod: "/logs.LogService/WriteLog", } handler := func(ctx context.Context, req interface{}) (interface{}, error) { return srv.(LogServiceServer).WriteLog(ctx, req.(*LogRequest)) } return interceptor(ctx, in, info, handler) } // LogService_ServiceDesc is the grpc.ServiceDesc for LogService service. // It's only intended for direct use with grpc.RegisterService, // and not to be introspected or modified (even as a copy) var LogService_ServiceDesc = grpc.ServiceDesc{ ServiceName: "logs.LogService", HandlerType: (*LogServiceServer)(nil), Methods: []grpc.MethodDesc{ { MethodName: "WriteLog", Handler: _LogService_WriteLog_Handler, }, }, Streams: []grpc.StreamDesc{}, Metadata: "logs/logs.proto", } ================================================ FILE: broker-service.dockerfile ================================================ # The base go-image FROM alpine:latest RUN mkdir /app COPY broker-service/brokerApp /app # Run the server executable CMD [ "/app/brokerApp" ] ================================================ FILE: caddy.dockerfile ================================================ FROM caddy:2.4.6-alpine COPY Caddyfile /etc/caddy/Caddyfile ================================================ FILE: db-data/.gitignore ================================================ * !*/ !.gitignore !.gitkeep ================================================ FILE: db-data/.gitkeep ================================================ ================================================ FILE: docker-compose.yml ================================================ version: '3' services: # # broker-service - main entry point; we call this from the front end # broker-service: # build: # context: . # dockerfile: ./broker-service.dockerfile # restart: always # ports: # - "8080:80" # deploy: # mode: replicated # replicas: 1 # environment: # RABBIT_URL: "amqp://guest:guest@rabbitmq" # # # listener-service - watches rabbitmq for messages # listener-service: # build: # context: . # dockerfile: ./listener-service.dockerfile # deploy: # mode: replicated # replicas: 1 # environment: # RABBIT_URL: "amqp://guest:guest@rabbitmq" # # # authentication-service - handles user auth # authentication-service: # build: # context: . # dockerfile: ./authentication-service.dockerfile # restart: always # ports: # - "8081:80" # deploy: # mode: replicated # replicas: 1 # environment: # DSN: "host=postgres port=5432 user=postgres password=password dbname=users sslmode=disable timezone=UTC connect_timeout=5" # # # logger-service: a service to store logs # logger-service: # build: # context: . # dockerfile: ./logger-service.dockerfile # restart: always # ports: # - "8082:80" # deploy: # mode: replicated # replicas: 1 # volumes: # - ./logger-service/templates/:/app/templates # # # mail-service - handles sending mail # mail-service: # build: # context: . # dockerfile: ./mail-service.dockerfile # restart: always # deploy: # mode: replicated # replicas: 1 # environment: # MAIL_DOMAIN: localhost # MAIL_HOST: mailhog # MAIL_PORT: 1025 # MAIL_ENCRYPTION: none # MAIL_USERNAME: "" # MAIL_PASSWORD: "" # FROM_NAME: "John Smith" # FROM_ADDRESS: john.smith@example.com # # # rabbitmq: the rabbitmq server # rabbitmq: # image: 'rabbitmq:3.9-alpine' # ports: # - "5672:5672" # deploy: # mode: replicated # replicas: 1 # volumes: # - ./db-data/rabbitmq/:/var/lib/rabbitmq/ # # # mailhog: a fake smtp server with a web interface # mailhog: # image: 'mailhog/mailhog:latest' # ports: # - "1025:1025" # - "8025:8025" # deploy: # mode: replicated # replicas: 1 # # mongo: start MongoDB and ensure that data is stored to a mounted volume mongo: image: 'mongo:4.2.17-bionic' ports: - "27017:27017" # restart: always deploy: mode: replicated replicas: 1 environment: MONGO_INITDB_DATABASE: logs MONGO_INITDB_ROOT_USERNAME: admin MONGO_INITDB_ROOT_PASSWORD: password volumes: - ./db-data/mongo/:/data/db # postgres: start Postgres, and ensure that data is stored to a mounted volume postgres: image: 'postgres:14.2' ports: - "5432:5432" restart: always deploy: mode: replicated replicas: 1 environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: password POSTGRES_DB: users volumes: - ./db-data/postgres/:/var/lib/postgresql/data/ # etcd: start etcd server # etcd: # image: docker.io/bitnami/etcd:3 # environment: # - ALLOW_NONE_AUTHENTICATION=yes # deploy: # mode: replicated # replicas: 1 # volumes: # - ./db-data/etcd/:/bitnami/etcd ================================================ FILE: front-end/cmd/web/main.go ================================================ package main import ( "embed" "fmt" "html/template" "log" "net/http" ) func main() { // the handler to display our page http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { render(w, "test.page.gohtml") }) // start the web server fmt.Println("Starting front end service on port 80") err := http.ListenAndServe(":80", nil) if err != nil { log.Panic(err) } } //go:embed templates var templateFS embed.FS // render generates a page of html from our template files func render(w http.ResponseWriter, t string) { // all the required templates for any page partials := []string{ "templates/base.layout.gohtml", "templates/header.partial.gohtml", "templates/footer.partial.gohtml", } // append the template we received as a parameter var templateSlice []string templateSlice = append(templateSlice, fmt.Sprintf("templates/%s", t)) for _, x := range partials { templateSlice = append(templateSlice, x) } // parse the templates //tmpl, err := template.ParseFiles(templateSlice...) tmpl, err := template.ParseFS(templateFS, templateSlice...) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } // execute the template if err := tmpl.Execute(w, nil); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) } } ================================================ FILE: front-end/cmd/web/templates/base.layout.gohtml ================================================ {{define "base" }} {{template "header" .}} {{block "content" .}} {{end}} {{block "js" .}} {{end}} {{template "footer" .}} {{end}} ================================================ FILE: front-end/cmd/web/templates/footer.partial.gohtml ================================================ {{define "footer"}}
Copyright © GoCode.ca
{{end}} ================================================ FILE: front-end/cmd/web/templates/header.partial.gohtml ================================================ {{define "header"}} Microservices in Go {{end}} ================================================ FILE: front-end/cmd/web/templates/test.page.gohtml ================================================ {{template "base" .}} {{define "content" }}

Test Go microservices

Test broker Test auth Test email Test log Test gRPC log
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{{end}} {{define "js"}} {{end}} ================================================ FILE: front-end/go.mod ================================================ module frontend go 1.18 ================================================ FILE: front-end.dockerfile ================================================ FROM alpine:latest RUN mkdir /app COPY front-end/frontEndLinux /app # Run the server executable CMD [ "/app/frontEndLinux" ] ================================================ FILE: ingress.yml ================================================ apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: example-ingress annotations: nginx.ingress.kubernetes.io/rewrite-target: /$1 spec: rules: - host: broker-service.local http: paths: - path: / pathType: Prefix backend: service: name: broker-service port: number: 8080 ================================================ FILE: k8s/authentication.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: authentication-service spec: replicas: 1 selector: matchLabels: app: authentication-service template: metadata: labels: app: authentication-service spec: containers: - name: authentication-service image: "tsawler/authentication-service:1.0.0" env: - name: DSN value: "host=host.minikube.internal port=5432 user=postgres password=password dbname=users sslmode=disable timezone=UTC connect_timeout=5" resources: limits: memory: "128Mi" cpu: "500m" ports: - containerPort: 80 --- apiVersion: v1 kind: Service metadata: name: authentication-service spec: selector: app: authentication-service ports: - protocol: TCP port: 80 targetPort: 80 ================================================ FILE: k8s/broker.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: broker-service spec: replicas: 1 selector: matchLabels: app: broker-service template: metadata: labels: app: broker-service spec: containers: - name: broker-service image: "tsawler/broker-service:1.0.1" env: - name: RABBIT_URL value: "amqp://guest:guest@rabbitmq" resources: limits: memory: "128Mi" cpu: "500m" ports: - containerPort: 80 --- apiVersion: v1 kind: Service metadata: name: broker-service spec: selector: app: broker-service ports: - protocol: TCP port: 80 name: web-port targetPort: 80 ================================================ FILE: k8s/listener.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: listener spec: replicas: 1 selector: matchLabels: app: listener template: metadata: labels: app: listener spec: containers: - name: listener image: "tsawler/listener-service:1.0.0" env: - name: RABBIT_URL value: "amqp://guest:guest@rabbitmq" ports: - containerPort: 80 --- apiVersion: v1 kind: Service metadata: name: listener spec: selector: app: listener ports: - protocol: TCP port: 80 targetPort: 80 ================================================ FILE: k8s/logger.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: logger-service spec: replicas: 2 selector: matchLabels: app: logger-service template: metadata: labels: app: logger-service spec: containers: - name: logger image: "tsawler/logger-service:1.0.1" env: - name: RABBIT_URL value: "amqp://guest:guest@rabbitmq" ports: - containerPort: 80 - containerPort: 5001 - containerPort: 50001 --- apiVersion: v1 kind: Service metadata: name: logger-service spec: selector: app: logger-service ports: - protocol: TCP port: 80 name: web-port targetPort: 80 - protocol: TCP port: 5001 name: rpc-port targetPort: 5001 - protocol: port: 50001 name: grpc-port targetPort: 50001 ================================================ FILE: k8s/mail.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: mail-service spec: replicas: 1 selector: matchLabels: app: mail-service template: metadata: labels: app: mail-service spec: containers: - name: mail-service image: "tsawler/mail-service:1.0.0" env: - name: MAIL_DOMAIN value: "localhost" - name: MAIL_HOST value: "mailhog" - name: MAIL_PORT value: "1025" - name: MAIL_ENCRYPTION value: "localhost" - name: MAIL_USERNAME value: "" - name: MAIL_PASSWORD value: "" - name: FROM_NAME value: "John Smith" - name: FROM_ADDRESS value: "john.smith@example.com" ports: - containerPort: 80 --- apiVersion: v1 kind: Service metadata: name: mail-service spec: selector: app: mail-service ports: - protocol: TCP port: 80 targetPort: 80 ================================================ FILE: k8s/mailhog.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: mailhog spec: replicas: 1 selector: matchLabels: app: mailhog template: metadata: labels: app: mailhog spec: containers: - name: mailhog image: "mailhog/mailhog:latest" ports: - containerPort: 1025 - containerPort: 8025 --- apiVersion: v1 kind: Service metadata: name: mailhog spec: selector: app: mailhog ports: - protocol: TCP name: smtp-port port: 1025 targetPort: 1025 - protocol: TCP name: web-port port: 8025 targetPort: 8025 ================================================ FILE: k8s/mongo.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: mongo spec: replicas: 1 selector: matchLabels: app: mongo template: metadata: labels: app: mongo spec: containers: - name: mongo image: "mongo:4.2.17-bionic" env: - name: MONGO_INITDB_DATABASE value: "logs" - name: MONGO_INITDB_ROOT_USERNAME value: "admin" - name: MONGO_INITDB_ROOT_PASSWORD value: "password" ports: - containerPort: 27017 --- apiVersion: v1 kind: Service metadata: name: mongo spec: selector: app: mongo ports: - protocol: TCP name: main-port port: 27017 targetPort: 27017 ================================================ FILE: k8s/rabbitmq.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: rabbitmq spec: replicas: 1 selector: matchLabels: app: rabbitmq template: metadata: labels: app: rabbitmq spec: containers: - name: rabbitmq image: "rabbitmq:3.9-alpine" ports: - containerPort: 5672 --- apiVersion: v1 kind: Service metadata: name: rabbitmq spec: selector: app: rabbitmq ports: - protocol: TCP port: 5672 targetPort: 5672 ================================================ FILE: k8s.md ================================================ # K8S ``` minikube start --nodes=2 minikube status docker ps kubectl get nodes kubectl get pods -A kubectl get pods kubectl apply -f deployment.yml # or kubectl apply -f kubectl get pods kubectl get svc kubectl get deployments minikube dashboard ``` # hit the app ``` kubectl expose deployment broker --type=LoadBalancer --port=8080 --target-port=80 minikube tunnel ``` # stop service/app ``` kubectl delete deployments kubectl delete services ``` # stop minikube ``` minikube stop ``` ================================================ FILE: listener-service/go.mod ================================================ module github.com/tsawler/go-rabbit go 1.18 require github.com/rabbitmq/amqp091-go v1.7.0 ================================================ FILE: listener-service/go.sum ================================================ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo= github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/rabbitmq/amqp091-go v1.3.0 h1:A/QuHiNw7LMCJsxx9iZn5lrIz6OrhIn7Dfk5/1YatWM= github.com/rabbitmq/amqp091-go v1.3.0/go.mod h1:ogQDLSOACsLPsIq0NpbtiifNZi2YOz0VTJ0kHRghqbM= github.com/rabbitmq/amqp091-go v1.3.2 h1:zezKg1S58+q/9Ej7DIqFL6TP6NGMyGPb4ykEm4n94cY= github.com/rabbitmq/amqp091-go v1.3.2/go.mod h1:ogQDLSOACsLPsIq0NpbtiifNZi2YOz0VTJ0kHRghqbM= github.com/rabbitmq/amqp091-go v1.7.0 h1:V5CF5qPem5OGSnEo8BoSbsDGwejg6VUJsKEdneaoTUo= github.com/rabbitmq/amqp091-go v1.7.0/go.mod h1:wfClAtY0C7bOHxd3GjmF26jEHn+rR/0B3+YV+Vn9/NI= github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw= github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU= github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= go.uber.org/goleak v1.2.0/go.mod h1:XJYK+MuIchqpmGmUSAzotztawfKvYLUIgg7guXrwVUo= golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM= golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk= golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= ================================================ FILE: listener-service/lib/event/consumer.go ================================================ package event import ( "bytes" "encoding/json" "fmt" "log" "net/http" "net/rpc" amqp "github.com/rabbitmq/amqp091-go" ) // Consumer is the type used for receiving AMPQ events type Consumer struct { conn *amqp.Connection queueName string } // NewConsumer returns a new Consumer func NewConsumer(conn *amqp.Connection) (Consumer, error) { consumer := Consumer{ conn: conn, } err := consumer.setup() if err != nil { return Consumer{}, err } return consumer, nil } // setup opens a channel and declares the exchange func (consumer *Consumer) setup() error { channel, err := consumer.conn.Channel() if err != nil { return err } return declareExchange(channel) } // Payload is the type used for pushing events to RabbitMQ type Payload struct { Name string `json:"name"` Data string `json:"data"` } // Listen will listen for all new queue publications func (consumer *Consumer) Listen(topics []string) error { ch, err := consumer.conn.Channel() if err != nil { return err } defer ch.Close() q, err := declareRandomQueue(ch) if err != nil { return err } for _, s := range topics { err = ch.QueueBind( q.Name, s, getExchangeName(), false, nil, ) if err != nil { log.Println(err) return err } } messages, err := ch.Consume(q.Name, "", true, false, false, false, nil) if err != nil { return err } forever := make(chan bool) go func() { for d := range messages { // get the JSON payload and unmarshal it into a variable var payload Payload _ = json.Unmarshal(d.Body, &payload) // do something with the payload go handlePayload(payload) } }() log.Printf("[*] Waiting for message [Exchange, Queue][%s, %s].", getExchangeName(), q.Name) <-forever return nil } // handlePayload takes an action based on the name of an event in the queue func handlePayload(payload Payload) { // logic to process payload goes in here switch payload.Name { case "broker_hit": // just a test to make sure everything works res, err := rpcPushToLogger("LogInfo", payload) if err != nil { log.Println(err) } fmt.Println("Response from RPC:", res) case "auth", "authentication": // we are trying to authenticate someone err := authenticate(payload) if err != nil { log.Println(err) } // you can have as many cases as you want here, but naturally you'll have to write the logic // to connect to a given microservice default: // log whatever we get res, err := rpcPushToLogger("LogInfo", payload) if err != nil { log.Println(err) } fmt.Println("Response from RPC:", res) } } // rpcPushToLogger pushes data to the logger-service via RPC, where // it gets stored into a mongo database func rpcPushToLogger(function string, data any) (string, error) { c, err := rpc.Dial("tcp", "logger-service:5001") if err != nil { log.Println(err) return "", err } fmt.Println("Connected via rpc...") var result string err = c.Call("RPCServer."+function, data, &result) if err != nil { return "", err } return result, nil } // authenticate is a stub that we'll never actually use, but it is here // as we get used to how to interact with services func authenticate(payload Payload) error { // TODO actually authenticate via JSON log.Printf("Got payload of %v", payload) return nil } func logEvent(entry Payload) error { jsonData, _ := json.MarshalIndent(entry, "", "\t") logServiceURL := "http://logger-service/log" request, err := http.NewRequest("POST", logServiceURL, bytes.NewBuffer(jsonData)) if err != nil { return err } request.Header.Set("Content-Type", "application/json") client := &http.Client{} response, err := client.Do(request) if err != nil { return err } defer response.Body.Close() if response.StatusCode != http.StatusAccepted { return err } return nil } ================================================ FILE: listener-service/lib/event/event.go ================================================ package event import ( amqp "github.com/rabbitmq/amqp091-go" ) func getExchangeName() string { return "logs_topic" } // declareRandomQueue just creates a random queue func declareRandomQueue(ch *amqp.Channel) (amqp.Queue, error) { return ch.QueueDeclare( "", // name false, // durable false, // delete when unused true, // exclusive false, // no-wait nil, // arguments ) } // declareExchange creates an exchange, with a name func declareExchange(ch *amqp.Channel) error { return ch.ExchangeDeclare( getExchangeName(), // name "topic", // type true, // durable false, // auto-deleted false, // internal false, // no-wait nil, // arguments ) } ================================================ FILE: listener-service/main.go ================================================ package main import ( "fmt" amqp "github.com/rabbitmq/amqp091-go" "github.com/tsawler/go-rabbit/lib/event" "log" "math" "os" "time" ) func main() { // try to connect to RabbitMQ rabbitConn, err := connect() if err != nil { log.Println(err) os.Exit(1) } defer rabbitConn.Close() // start listening for messages log.Println("Listening for and consuming RabbitMQ messages...") // create a new consumer consumer, err := event.NewConsumer(rabbitConn) if err != nil { panic(err) } // consumer.Listen watches the queue and consumes events for all the provided topics. err = consumer.Listen([]string{"log.INFO", "log.WARNING", "log.ERROR"}) if err != nil { log.Println(err) } } // connect tries to connect to RabbitMQ, and delays between attempts. // If we can't connect after 5 tries (with increasing delays), return an error func connect() (*amqp.Connection, error) { var counts int64 var backOff = 1 * time.Second var connection *amqp.Connection var rabbitURL = os.Getenv("RABBIT_URL") // don't continue until rabbitmq is ready for { c, err := amqp.Dial(rabbitURL) if err != nil { fmt.Println("RabbitMQ not yet ready...") counts++ } else { // we have a connection to rabbitmq, so set connection = c and break out of // this loop connection = c fmt.Println() break } if counts > 5 { // if we can't connect after five tries, something is wrong... fmt.Println(err) return nil, err } fmt.Printf("Backing off for %d seconds...\n", int(math.Pow(float64(counts), 2))) backOff = time.Duration(math.Pow(float64(counts), 2)) * time.Second time.Sleep(backOff) continue } return connection, nil } ================================================ FILE: listener-service.dockerfile ================================================ FROM alpine:latest RUN mkdir /app COPY listener-service/listener /app # Run the server executable CMD [ "/app/listener" ] ================================================ FILE: logger-service/Makefile ================================================ gen: protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative logs/logs.proto ================================================ FILE: logger-service/cmd/web/discover.go ================================================ package main //// registerService registers the correct entry for this service in etcd //func (app *Config) registerService() { // // get a connection to etcd // cli, _ := connectToEtcd() // kv := clientv3.NewKV(cli) // // app.Etcd = cli // // // create a lease that lasts 10 seconds // lease := clientv3.NewLease(cli) // grantResp, err := lease.Grant(context.TODO(), 10) // if err != nil { // log.Println("Error creating lease", err) // } // // // insert something with the lease // _, err = kv.Put(context.TODO(), fmt.Sprintf("/logger/%s", app.randomString(32)), "logger-service", clientv3.WithLease(grantResp.ID)) // if err != nil { // log.Println("Error inserting using lease", err) // } // // // keep lease alive // kalRes, err := lease.KeepAlive(context.TODO(), grantResp.ID) // if err != nil { // log.Println("Error with keepalive", err) // } // go app.listenToKeepAlive(kalRes) //} // //// listenToKeepAlive consumes the responses from etcd, or the lease will not work as expected. //// We don't have to do anything with them, but we have to consume them. //func (app *Config) listenToKeepAlive(kalRes <-chan *clientv3.LeaseKeepAliveResponse) { // defer func() { // if r := recover(); r != nil { // log.Println("Error", fmt.Sprintf("%v", r)) // } // }() // // for { // _ = <-kalRes // } //} // //// connectToEtcd tries to connect to etcd, for up to 30 seconds //func connectToEtcd() (*clientv3.Client, error) { // var cli *clientv3.Client // var counts = 0 // // for { // c, err := clientv3.New(clientv3.Config{Endpoints: []string{"etcd:2379"}, // DialTimeout: 5 * time.Second, // }) // if err != nil { // fmt.Println("etcd not ready...") // counts++ // } else { // fmt.Println() // cli = c // break // } // // if counts > 15 { // return nil, err // } // fmt.Println("Backing off for 2 seconds...") // time.Sleep(2 * time.Second) // continue // } // log.Println("Connected to etcd!") // return cli, nil //} ================================================ FILE: logger-service/cmd/web/grpc.go ================================================ package main import ( "context" "fmt" "google.golang.org/grpc" "log" "log-service/data" "log-service/logs" "net" ) // LogServer is type used for writing to the log via gRPC. Note that we embed the // data.Models type, so we have access to Mongo. type LogServer struct { logs.UnimplementedLogServiceServer Models data.Models } // WriteLog writes the log after receiving a call from a gRPC client. This function // must exist, and is defined in logs/logs.proto, in the "service LogService" bit // at the end of the file. func (l *LogServer) WriteLog(ctx context.Context, req *logs.LogRequest) (*logs.LogResponse, error) { input := req.GetLogEntry() log.Println("Log:", input.Name, input.Data) // write the log logEntry := data.LogEntry{ Name: input.Name, Data: input.Data, } err := l.Models.LogEntry.Insert(logEntry) if err != nil { res := &logs.LogResponse{Result: "failed:"} return res, err } // return response res := &logs.LogResponse{Result: "logged!"} return res, nil } // gRPCListen starts the gRPC server func (app *Config) gRPCListen() { lis, err := net.Listen("tcp", fmt.Sprintf(":%s", gRpcPort)) if err != nil { log.Fatalf("Failed to listen: %v", err) } s := grpc.NewServer() // register the service, handing it models (so we can write to the database) logs.RegisterLogServiceServer(s, &LogServer{Models: app.Models}) log.Printf("gRPC server started at port %s", gRpcPort) if err := s.Serve(lis); err != nil { log.Fatalf("Failed to serve: %v", err) } } ================================================ FILE: logger-service/cmd/web/handlers.go ================================================ package main import ( "bytes" "encoding/json" "fmt" "github.com/go-chi/chi/v5" "io" "log" "net/http" "time" ) // authServiceURL is the url to the authentication service. Since we're using // Docker, we specify the appropriate entry from docker-compose.yml const authServiceURL = "http://authentication-service/authenticate" // JSONPayload is the type for JSON posted to this API type JSONPayload struct { Name string `json:"name"` Data string `json:"data"` } // WriteLog is the handler to accept a post request consisting of json payload, // and then write it to Mongo func (app *Config) WriteLog(w http.ResponseWriter, r *http.Request) { // read json into var var requestPayload JSONPayload _ = app.readJSON(w, r, &requestPayload) // insert the data err := app.logEvent(requestPayload.Name, requestPayload.Data) if err != nil { log.Println(err) _ = app.errorJSON(w, err, http.StatusBadRequest) return } // create the response we'll send back as JSON resp := jsonResponse{ Error: false, Message: "logged", } // write the response back as JSON _ = app.writeJSON(w, http.StatusAccepted, resp) } // Logout logs the user out and redirects them to the login page func (app *Config) Logout(w http.ResponseWriter, r *http.Request) { // log the event _ = app.logEvent("authentication", fmt.Sprintf("%s logged out of the logger service", app.Session.GetString(r.Context(), "email"))) // clean up session _ = app.Session.Destroy(r.Context()) _ = app.Session.RenewToken(r.Context()) // redirect to login page http.Redirect(w, r, "/login", http.StatusSeeOther) } // LoginPage displays the login page func (app *Config) LoginPage(w http.ResponseWriter, r *http.Request) { app.render(w, r, "login.page.gohtml", nil) } // LoginPagePost handles user login. Note that it calls the authentication microservice func (app *Config) LoginPagePost(w http.ResponseWriter, r *http.Request) { // it's always good to regenerate the session on login/logout _ = app.Session.RenewToken(r.Context()) // parse the posted form data err := r.ParseForm() if err != nil { log.Println(err) } // get email and password from form post email := r.Form.Get("email") password := r.Form.Get("password") // create a variable we'll post to the auth service as JSON var requestPayload struct { Email string `json:"email"` Password string `json:"password"` } requestPayload.Email = email requestPayload.Password = password // create json we'll send to the authentication-service jsonData, _ := json.MarshalIndent(requestPayload, "", "\t") // call the authentication-service; we need a request, so let's build one, and populate // its body with the jsonData we just created request, err := http.NewRequest("POST", authServiceURL, bytes.NewBuffer(jsonData)) request.Header.Set("Content-Type", "application/json") c := &http.Client{} response, err := c.Do(request) if err != nil { log.Println(err) _ = app.errorJSON(w, err, http.StatusBadRequest) return } defer response.Body.Close() // make sure we get back the right status code if response.StatusCode == http.StatusUnauthorized { log.Println("wrong status code", response.StatusCode) http.Redirect(w, r, "/login", http.StatusSeeOther) return } else if response.StatusCode != http.StatusAccepted { log.Println("did not get status accepted") http.Redirect(w, r, "/login", http.StatusSeeOther) return } // Read the body of the response body, err := io.ReadAll(response.Body) if err != nil { app.clientError(w, http.StatusBadRequest) return } // define a type that matches the JSON we're getting from the response body type userPayload struct { Error bool `json:"error"` Message string `json:"message"` Data struct { ID int `json:"id"` Email string `json:"email"` FirstName string `json:"first_name"` LastName string `json:"last_name"` Active int `json:"active"` CreatedAt time.Time `json:"created_at"` UpdatedAt time.Time `json:"updated_at"` } `json:"data"` } // declare a variable we can unmarshal the JSON into var user userPayload // since we received the request from a remote host with http.Client, // we need to build a new request with the body we received and pass it to // app.readJSON req, _ := http.NewRequest("POST", "/", bytes.NewReader(body)) // read the JSON err = app.readJSON(w, req, &user) if err != nil { log.Println(err) app.clientError(w, http.StatusBadRequest) return } // log the event _ = app.logEvent("authentication", fmt.Sprintf("%s logged into the logger service", user.Data.Email)) // set up session & log user in app.Session.Put(r.Context(), "userID", user.Data.ID) app.Session.Put(r.Context(), "email", user.Data.Email) http.Redirect(w, r, "/admin/dashboard", http.StatusSeeOther) } // Dashboard displays the dashboard page func (app *Config) Dashboard(w http.ResponseWriter, r *http.Request) { // get the list of all log entries from mongo logs, err := app.Models.LogEntry.All() if err != nil { log.Println("Error getting all log entries") app.clientError(w, http.StatusBadRequest) } templateData := make(map[string]any) templateData["logs"] = logs app.render(w, r, "dashboard.page.gohtml", &TemplateData{ Data: templateData, }) } // DisplayOne is the handler to display a single log entry func (app *Config) DisplayOne(w http.ResponseWriter, r *http.Request) { id := chi.URLParam(r, "id") entry, err := app.Models.LogEntry.GetOne(id) if err != nil { app.clientError(w, http.StatusBadRequest) return } templateData := make(map[string]any) templateData["entry"] = entry app.render(w, r, "entry.page.gohtml", &TemplateData{ Data: templateData, }) } // DeleteAll drops everything in the collection and redirects to the same page func (app *Config) DeleteAll(w http.ResponseWriter, r *http.Request) { err := app.Models.LogEntry.DropCollection() if err != nil { log.Println(err) } http.Redirect(w, r, "/admin/dashboard", http.StatusSeeOther) } // UpdateTimeStamp just demos how to update a document func (app *Config) UpdateTimeStamp(w http.ResponseWriter, r *http.Request) { id := chi.URLParam(r, "id") entry, err := app.Models.LogEntry.GetOne(id) if err != nil { log.Println("Error getting record:", err) app.clientError(w, http.StatusBadRequest) return } res, err := entry.Update() if err != nil { log.Println("Error updating", err) app.clientError(w, http.StatusBadRequest) return } log.Println("Result in handler:", res.ModifiedCount) http.Redirect(w, r, "/admin/dashboard", http.StatusSeeOther) } ================================================ FILE: logger-service/cmd/web/helpers.go ================================================ package main import ( "crypto/rand" "encoding/json" "errors" "fmt" "io" "log" "log-service/data" "net/http" "runtime/debug" "time" ) const randomStringSource = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0987654321_+" type jsonResponse struct { Error bool `json:"error"` Message string `json:"message"` Data any `json:"data,omitempty"` } // readJSON tries to read the body of a request and converts it into JSON func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error { maxBytes := 1048576 // one megabyte r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes)) dec := json.NewDecoder(r.Body) err := dec.Decode(data) if err != nil { return err } err = dec.Decode(&struct{}{}) if err != io.EOF { return errors.New("body must have only a single json value") } return nil } // writeJSON takes a response status code and arbitrary data and writes a json response to the client func (app *Config) writeJSON(w http.ResponseWriter, status int, data any, headers ...http.Header) error { out, err := json.Marshal(data) if err != nil { return err } if len(headers) > 0 { for key, value := range headers[0] { w.Header()[key] = value } } w.Header().Set("Content-Type", "application/json") w.WriteHeader(status) _, err = w.Write(out) if err != nil { return err } return nil } // errorJSON takes an error, and optionally a response status code, and generates and sends // a json error response func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error { statusCode := http.StatusBadRequest if len(status) > 0 { statusCode = status[0] } var payload jsonResponse payload.Error = true payload.Message = err.Error() return app.writeJSON(w, statusCode, payload) } // isAuthenticated checks to see if a user is authenticated by looking for userID in session func (app *Config) isAuthenticated(r *http.Request) bool { exists := app.Session.Exists(r.Context(), "userID") return exists } // clientError just fires back a client error when something goes wrong (bad request) func (app *Config) clientError(w http.ResponseWriter, status int) { log.Println("Client error with status of", status) http.Error(w, http.StatusText(status), status) } // serverError just fires back error 500 when something goes wrong func (app *Config) serverError(w http.ResponseWriter, err error) { trace := fmt.Sprintf("%s\n%s", err.Error(), debug.Stack()) log.Println(trace) http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError) } // logEvent saves an event to the logs collection in Mongo func (app *Config) logEvent(name, content string) error { event := data.LogEntry{ Name: name, Data: content, CreatedAt: time.Now(), } return app.Models.LogEntry.Insert(event) } // randomString returns a random string of letters of length n func (app *Config) randomString(n int) string { s, r := make([]rune, n), []rune(randomStringSource) for i := range s { p, _ := rand.Prime(rand.Reader, len(r)) x, y := p.Uint64(), uint64(len(r)) s[i] = r[x%y] } return string(s) } ================================================ FILE: logger-service/cmd/web/main.go ================================================ package main import ( "context" "fmt" "github.com/alexedwards/scs/v2" clientv3 "go.etcd.io/etcd/client/v3" "go.mongodb.org/mongo-driver/mongo" "go.mongodb.org/mongo-driver/mongo/options" "log" "log-service/data" "net" "net/http" "net/rpc" "time" ) var client *mongo.Client const ( webPort = "80" rpcPort = "5001" mongoURL = "mongodb://mongo:27017" gRpcPort = "50001" ) type Config struct { Session *scs.SessionManager Models data.Models Etcd *clientv3.Client } func main() { // Connect to Mongo and get a client. mongoClient, err := connectToMongo() client = mongoClient // We'll use this context to disconnect from mongo, since it needs one. ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) defer cancel() // close connection to Mongo when application exits defer func() { if err = client.Disconnect(ctx); err != nil { panic(err) } }() // Set up application configuration with session and our Models type, // which allows us to interact with Mongo. session := scs.New() session.Lifetime = 24 * time.Hour session.Cookie.Persist = true session.Cookie.SameSite = http.SameSiteLaxMode session.Cookie.Secure = false app := Config{ Session: session, Models: data.New(client), } // connect to etcd and register service //app.registerService() //defer app.Etcd.Close() // Start webserver in its own GoRoutine go app.serve() // Start the gRPC server in its own GoRoutine go app.gRPCListen() // Register the RPC server. err = rpc.Register(new(RPCServer)) if err != nil { return } // Listen for RPC connections on port rpcPort log.Println("Starting RPC Server on port", rpcPort) listen, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%s", rpcPort)) if err != nil { fmt.Println(err) return } defer listen.Close() // this loop executes forever, waiting for connections for { rpcConn, err := listen.Accept() if err != nil { continue } log.Println("Working...") go rpc.ServeConn(rpcConn) } } // serve starts the web server. func (app *Config) serve() { srv := &http.Server{ Addr: fmt.Sprintf(":%s", webPort), Handler: app.routes(), } fmt.Println("--------------------------------------") fmt.Println("Starting logging web service on port", webPort) err := srv.ListenAndServe() if err != nil { log.Panic(err) } } // Connect opens a connection to the Mongo database and returns a client. func connectToMongo() (*mongo.Client, error) { // create connect options clientOptions := options.Client().ApplyURI(mongoURL) clientOptions.SetAuth(options.Credential{ Username: "admin", Password: "password", }) // Connect to the MongoDB and return Client instance c, err := mongo.Connect(context.TODO(), clientOptions) if err != nil { fmt.Println("mongo.Connect() ERROR:", err) return nil, err } return c, nil } ================================================ FILE: logger-service/cmd/web/middleware.go ================================================ package main import "net/http" // SessionLoad loads and saves the session on every request func (app *Config) SessionLoad(next http.Handler) http.Handler { return app.Session.LoadAndSave(next) } // Auth requires that users be logged in for any route that uses this middleware func (app *Config) Auth(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if !app.isAuthenticated(r) { app.Session.Put(r.Context(), "error", "Log in first!") http.Redirect(w, r, "/login", http.StatusSeeOther) return } next.ServeHTTP(w, r) }) } ================================================ FILE: logger-service/cmd/web/render.go ================================================ package main import ( "fmt" "html/template" "net/http" ) type TemplateData struct { Data map[string]any IsAuthenticated int } // addDefaultData adds whatever is specified in this function to all templates as // data that can be accessed directly. func (app *Config) addDefaultData(td *TemplateData, r *http.Request) *TemplateData { if app.Session.Exists(r.Context(), "userID") { td.IsAuthenticated = 1 } return td } func (app *Config) render(w http.ResponseWriter, r *http.Request, t string, td *TemplateData) { // we only have one partial, which is actually a layout, but since all of our pages // require the layout, we need to include it when we call ParseFiles, below. // If you have other partials you use in your templates, add them to this slice. partials := []string{ "./templates/base.layout.gohtml", } var templateSlice []string templateSlice = append(templateSlice, fmt.Sprintf("./templates/%s", t)) for _, x := range partials { templateSlice = append(templateSlice, x) } tmpl, err := template.ParseFiles(templateSlice...) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } if td == nil { td = &TemplateData{} } td = app.addDefaultData(td, r) if err := tmpl.Execute(w, td); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) } } ================================================ FILE: logger-service/cmd/web/routes.go ================================================ package main import ( "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-chi/cors" "net/http" ) func (app *Config) routes() http.Handler { mux := chi.NewRouter() mux.Use(middleware.Recoverer) mux.Use(middleware.Heartbeat("/ping")) mux.Mount("/", app.webRouter()) mux.Mount("/api", app.apiRouter()) return mux } // apiRouter is for api routes (no session load) func (app *Config) apiRouter() http.Handler { mux := chi.NewRouter() // specify who is allowed to connect to our API service mux.Use(cors.Handler(cors.Options{ AllowedOrigins: []string{"https://*", "http://*"}, AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}, AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, ExposedHeaders: []string{"Link"}, AllowCredentials: true, MaxAge: 300, })) mux.Post("/log", app.WriteLog) return mux } // webRouter is for web routes func (app *Config) webRouter() http.Handler { mux := chi.NewRouter() mux.Use(app.SessionLoad) mux.Get("/", app.LoginPage) mux.Get("/login", app.LoginPage) mux.Post("/login", app.LoginPagePost) mux.Get("/logout", app.Logout) mux.Route("/admin", func(mux chi.Router) { mux.Use(app.Auth) mux.Get("/dashboard", app.Dashboard) mux.Get("/log-entry/{id}", app.DisplayOne) mux.Get("/delete-all", app.DeleteAll) mux.Get("/update/{id}", app.UpdateTimeStamp) }) return mux } ================================================ FILE: logger-service/cmd/web/rpc.go ================================================ package main import ( "context" "log" "log-service/data" "time" ) // RPCServer is the type for our RPC Server. Methods that take this as a receiver are available // over RPC, as long as they are exported. type RPCServer struct{} // RPCPayload is the type for data we receive from RPC type RPCPayload struct { Name string Data string } // LogInfo writes our payload to mongo func (r *RPCServer) LogInfo(payload RPCPayload, resp *string) error { collection := client.Database("logs").Collection("logs") _, err := collection.InsertOne(context.TODO(), data.LogEntry{ Name: payload.Name, Data: payload.Data, CreatedAt: time.Now(), }) if err != nil { log.Println("Error writing log in rpc.go, LogInfo", err) return err } // resp is the message sent back to the RPC caller *resp = "Processed payload via RPC: " + payload.Name return nil } ================================================ FILE: logger-service/data/models.go ================================================ package data import ( "context" "go.mongodb.org/mongo-driver/bson" "go.mongodb.org/mongo-driver/bson/primitive" "go.mongodb.org/mongo-driver/mongo" "go.mongodb.org/mongo-driver/mongo/options" "log" "time" ) // client is our mongo client that allows us to perform operations on the Mongo database. var client *mongo.Client // New is the function used to create an instance of the data package. It returns the type // Model, which embeds all the types we want to be available to our application. func New(mongo *mongo.Client) Models { client = mongo return Models{ LogEntry: LogEntry{}, } } // Models is the type for this package. Note that any model that is included as a member // in this type is available to us throughout the application, anywhere that the // app variable is used, provided that the model is also added in the New function. type Models struct { LogEntry LogEntry } // LogEntry is the type for all data stored in the logs collection. Note that we specify // specific bson values, and we *must* include omitempty on ID, or newly inserted records will // have an empty id! We also specify JSON struct tags, even though we don't use them yet. We // might in the future. type LogEntry struct { ID string `bson:"_id,omitempty" json:"id,omitempty"` Name string `bson:"name" json:"name"` Data string `bson:"data" json:"data"` CreatedAt time.Time `bson:"created_at" json:"created_at"` UpdatedAt time.Time `bson:"updated_at" json:"updated_at"` } // Insert puts a document in the logs collection. func (l *LogEntry) Insert(entry LogEntry) error { collection := client.Database("logs").Collection("logs") _, err := collection.InsertOne(context.TODO(), LogEntry{ Name: entry.Name, Data: entry.Data, CreatedAt: time.Now(), UpdatedAt: time.Now(), }) if err != nil { log.Println("Error inserting log entry:", err) return err } return nil } // All returns all documents in the logs collection, by descending date/time. func (l *LogEntry) All() ([]*LogEntry, error) { ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) defer cancel() collection := client.Database("logs").Collection("logs") opts := options.Find() opts.SetSort(bson.D{{"created_at", -1}}) cursor, err := collection.Find(context.TODO(), bson.D{}, opts) if err != nil { log.Println("Finding all documents ERROR:", err) return nil, err } defer cursor.Close(ctx) var logs []*LogEntry for cursor.Next(ctx) { var item LogEntry err := cursor.Decode(&item) if err != nil { log.Println("Error scanning log into slice:", err) return nil, err } else { logs = append(logs, &item) } } return logs, nil } // GetOne returns a single document, by ID. Note that we have to convert the parameter id // which this function receives to a mongo.ObjectID, which is what Mongo actually requires in // order to call the FindOne() function. func (l *LogEntry) GetOne(id string) (*LogEntry, error) { ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) defer cancel() collection := client.Database("logs").Collection("logs") docID, err := primitive.ObjectIDFromHex(id) if err != nil { return nil, err } var entry LogEntry err = collection.FindOne(ctx, bson.M{"_id": docID}).Decode(&entry) if err != nil { return nil, err } return &entry, nil } // DropCollection deletes the logs collection and everything in it func (l *LogEntry) DropCollection() error { ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) defer cancel() collection := client.Database("logs").Collection("logs") if err := collection.Drop(ctx); err != nil { return err } return nil } // Update updates on record, by id func (l *LogEntry) Update() (*mongo.UpdateResult, error) { ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) defer cancel() docID, err := primitive.ObjectIDFromHex(l.ID) if err != nil { return nil, err } log.Println("Matching", l.ID) collection := client.Database("logs").Collection("logs") result, err := collection.UpdateOne( ctx, bson.M{"_id": docID}, bson.D{ {"$set", bson.D{ {"name", l.Name}, {"data", l.Data}, {"updated_at", time.Now()}, }}, }, ) log.Println("Matched:", result.MatchedCount) log.Println("Modified:", result.ModifiedCount) if err != nil { return nil, err } return result, nil } ================================================ FILE: logger-service/go.mod ================================================ module log-service go 1.18 require ( github.com/alexedwards/scs/v2 v2.5.0 github.com/go-chi/chi/v5 v5.0.8 github.com/go-chi/cors v1.2.1 go.etcd.io/etcd/client/v3 v3.5.7 go.mongodb.org/mongo-driver v1.11.2 google.golang.org/grpc v1.53.0 google.golang.org/protobuf v1.28.1 ) require ( github.com/coreos/go-semver v0.3.1 // indirect github.com/coreos/go-systemd/v22 v22.5.0 // indirect github.com/go-stack/stack v1.8.1 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/golang/snappy v0.0.4 // indirect github.com/klauspost/compress v1.16.0 // indirect github.com/montanaflynn/stats v0.7.0 // indirect github.com/pkg/errors v0.9.1 // indirect github.com/xdg-go/pbkdf2 v1.0.0 // indirect github.com/xdg-go/scram v1.1.2 // indirect github.com/xdg-go/stringprep v1.0.4 // indirect github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a // indirect go.etcd.io/etcd/api/v3 v3.5.7 // indirect go.etcd.io/etcd/client/pkg/v3 v3.5.7 // indirect go.uber.org/atomic v1.10.0 // indirect go.uber.org/multierr v1.9.0 // indirect go.uber.org/zap v1.24.0 // indirect golang.org/x/crypto v0.6.0 // indirect golang.org/x/net v0.7.0 // indirect golang.org/x/sync v0.1.0 // indirect golang.org/x/sys v0.5.0 // indirect golang.org/x/text v0.7.0 // indirect google.golang.org/genproto v0.0.0-20230301171018-9ab4bdc49ad5 // indirect ) ================================================ FILE: logger-service/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= github.com/alexedwards/scs/v2 v2.5.0 h1:zgxOfNFmiJyXG7UPIuw1g2b9LWBeRLh3PjfB9BDmfL4= github.com/alexedwards/scs/v2 v2.5.0/go.mod h1:ToaROZxyKukJKT/xLcVQAChi5k6+Pn1Gvmdl7h3RRj8= github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8= github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA= github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk= github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI= github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM= github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk= github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4= github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec= github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI= github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs= github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98= github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0= github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8= github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0= github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/go-chi/cors v1.2.0 h1:tV1g1XENQ8ku4Bq3K9ub2AtgG+p16SmzeMSGTwrOKdE= github.com/go-chi/cors v1.2.0/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58= github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4= github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY= github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE= github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk= github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A= github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= github.com/go-stack/stack v1.8.1 h1:ntEHSVwIt7PNXNpgPmVfMrNhLtgjlmnZha2kOpuRiDw= github.com/go-stack/stack v1.8.1/go.mod h1:dcoOX6HbPZSZptuspn9bctJ+N/CnF5gGygcUP3XYfe4= github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.1/go.mod 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DO NOT EDIT. // versions: // protoc-gen-go v1.27.1 // protoc v3.19.4 // source: logs.proto package logs import ( protoreflect "google.golang.org/protobuf/reflect/protoreflect" protoimpl "google.golang.org/protobuf/runtime/protoimpl" reflect "reflect" sync "sync" ) const ( // Verify that this generated code is sufficiently up-to-date. _ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion) // Verify that runtime/protoimpl is sufficiently up-to-date. _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20) ) type Log struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"` Data string `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"` } func (x *Log) Reset() { *x = Log{} if protoimpl.UnsafeEnabled { mi := &file_logs_proto_msgTypes[0] ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms.StoreMessageInfo(mi) } } func (x *Log) String() string { return protoimpl.X.MessageStringOf(x) } func (*Log) ProtoMessage() {} func (x *Log) ProtoReflect() protoreflect.Message { mi := &file_logs_proto_msgTypes[0] if protoimpl.UnsafeEnabled && x != nil { ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) if ms.LoadMessageInfo() == nil { ms.StoreMessageInfo(mi) } return ms } return mi.MessageOf(x) } // Deprecated: Use Log.ProtoReflect.Descriptor instead. func (*Log) Descriptor() ([]byte, []int) { return file_logs_proto_rawDescGZIP(), []int{0} } func (x *Log) GetName() string { if x != nil { return x.Name } return "" } func (x *Log) GetData() string { if x != nil { return x.Data } return "" } type LogRequest struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields LogEntry *Log `protobuf:"bytes,1,opt,name=logEntry,proto3" json:"logEntry,omitempty"` } func (x *LogRequest) Reset() { *x = LogRequest{} if protoimpl.UnsafeEnabled { mi := &file_logs_proto_msgTypes[1] ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms.StoreMessageInfo(mi) } } func (x *LogRequest) String() string { return protoimpl.X.MessageStringOf(x) } func (*LogRequest) ProtoMessage() {} func (x *LogRequest) ProtoReflect() protoreflect.Message { mi := &file_logs_proto_msgTypes[1] if protoimpl.UnsafeEnabled && x != nil { ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) if ms.LoadMessageInfo() == nil { ms.StoreMessageInfo(mi) } return ms } return mi.MessageOf(x) } // Deprecated: Use LogRequest.ProtoReflect.Descriptor instead. func (*LogRequest) Descriptor() ([]byte, []int) { return file_logs_proto_rawDescGZIP(), []int{1} } func (x *LogRequest) GetLogEntry() *Log { if x != nil { return x.LogEntry } return nil } type LogResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields Result string `protobuf:"bytes,1,opt,name=result,proto3" json:"result,omitempty"` } func (x *LogResponse) Reset() { *x = LogResponse{} if protoimpl.UnsafeEnabled { mi := &file_logs_proto_msgTypes[2] ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms.StoreMessageInfo(mi) } } func (x *LogResponse) String() string { return protoimpl.X.MessageStringOf(x) } func (*LogResponse) ProtoMessage() {} func (x *LogResponse) ProtoReflect() protoreflect.Message { mi := &file_logs_proto_msgTypes[2] if protoimpl.UnsafeEnabled && x != nil { ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) if ms.LoadMessageInfo() == nil { ms.StoreMessageInfo(mi) } return ms } return mi.MessageOf(x) } // Deprecated: Use LogResponse.ProtoReflect.Descriptor instead. func (*LogResponse) Descriptor() ([]byte, []int) { return file_logs_proto_rawDescGZIP(), []int{2} } func (x *LogResponse) GetResult() string { if x != nil { return x.Result } return "" } var File_logs_proto protoreflect.FileDescriptor var file_logs_proto_rawDesc = []byte{ 0x0a, 0x0a, 0x6c, 0x6f, 0x67, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x04, 0x6c, 0x6f, 0x67, 0x73, 0x22, 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-> logs.LogRequest 2, // 2: logs.LogService.WriteLog:output_type -> logs.LogResponse 2, // [2:3] is the sub-list for method output_type 1, // [1:2] is the sub-list for method input_type 1, // [1:1] is the sub-list for extension type_name 1, // [1:1] is the sub-list for extension extendee 0, // [0:1] is the sub-list for field type_name } func init() { file_logs_proto_init() } func file_logs_proto_init() { if File_logs_proto != nil { return } if !protoimpl.UnsafeEnabled { file_logs_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*Log); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } file_logs_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*LogRequest); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } file_logs_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} { switch v := v.(*LogResponse); i { case 0: return &v.state case 1: return &v.sizeCache case 2: return &v.unknownFields default: return nil } } } type x struct{} out := protoimpl.TypeBuilder{ File: protoimpl.DescBuilder{ GoPackagePath: reflect.TypeOf(x{}).PkgPath(), RawDescriptor: file_logs_proto_rawDesc, NumEnums: 0, NumMessages: 3, NumExtensions: 0, NumServices: 1, }, GoTypes: file_logs_proto_goTypes, DependencyIndexes: file_logs_proto_depIdxs, MessageInfos: file_logs_proto_msgTypes, }.Build() File_logs_proto = out.File file_logs_proto_rawDesc = nil file_logs_proto_goTypes = nil file_logs_proto_depIdxs = nil } ================================================ FILE: logger-service/logs/logs.proto ================================================ syntax = "proto3"; package logs; option go_package = "/logs"; message Log{ string name = 1; string data =2; } message LogRequest { Log logEntry = 1; } message LogResponse{ string result = 1; } service LogService{ rpc WriteLog(LogRequest) returns (LogResponse) {} } ================================================ FILE: logger-service/logs/logs_grpc.pb.go ================================================ // Code generated by protoc-gen-go-grpc. DO NOT EDIT. // versions: // - protoc-gen-go-grpc v1.2.0 // - protoc v3.19.4 // source: logs.proto package logs import ( context "context" grpc "google.golang.org/grpc" codes "google.golang.org/grpc/codes" status "google.golang.org/grpc/status" ) // This is a compile-time assertion to ensure that this generated file // is compatible with the grpc package it is being compiled against. // Requires gRPC-Go v1.32.0 or later. const _ = grpc.SupportPackageIsVersion7 // LogServiceClient is the client API for LogService service. // // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream. type LogServiceClient interface { WriteLog(ctx context.Context, in *LogRequest, opts ...grpc.CallOption) (*LogResponse, error) } type logServiceClient struct { cc grpc.ClientConnInterface } func NewLogServiceClient(cc grpc.ClientConnInterface) LogServiceClient { return &logServiceClient{cc} } func (c *logServiceClient) WriteLog(ctx context.Context, in *LogRequest, opts ...grpc.CallOption) (*LogResponse, error) { out := new(LogResponse) err := c.cc.Invoke(ctx, "/logs.LogService/WriteLog", in, out, opts...) if err != nil { return nil, err } return out, nil } // LogServiceServer is the server API for LogService service. // All implementations must embed UnimplementedLogServiceServer // for forward compatibility type LogServiceServer interface { WriteLog(context.Context, *LogRequest) (*LogResponse, error) mustEmbedUnimplementedLogServiceServer() } // UnimplementedLogServiceServer must be embedded to have forward compatible implementations. type UnimplementedLogServiceServer struct { } func (UnimplementedLogServiceServer) WriteLog(context.Context, *LogRequest) (*LogResponse, error) { return nil, status.Errorf(codes.Unimplemented, "method WriteLog not implemented") } func (UnimplementedLogServiceServer) mustEmbedUnimplementedLogServiceServer() {} // UnsafeLogServiceServer may be embedded to opt out of forward compatibility for this service. // Use of this interface is not recommended, as added methods to LogServiceServer will // result in compilation errors. type UnsafeLogServiceServer interface { mustEmbedUnimplementedLogServiceServer() } func RegisterLogServiceServer(s grpc.ServiceRegistrar, srv LogServiceServer) { s.RegisterService(&LogService_ServiceDesc, srv) } func _LogService_WriteLog_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { in := new(LogRequest) if err := dec(in); err != nil { return nil, err } if interceptor == nil { return srv.(LogServiceServer).WriteLog(ctx, in) } info := &grpc.UnaryServerInfo{ Server: srv, FullMethod: "/logs.LogService/WriteLog", } handler := func(ctx context.Context, req interface{}) (interface{}, error) { return srv.(LogServiceServer).WriteLog(ctx, req.(*LogRequest)) } return interceptor(ctx, in, info, handler) } // LogService_ServiceDesc is the grpc.ServiceDesc for LogService service. // It's only intended for direct use with grpc.RegisterService, // and not to be introspected or modified (even as a copy) var LogService_ServiceDesc = grpc.ServiceDesc{ ServiceName: "logs.LogService", HandlerType: (*LogServiceServer)(nil), Methods: []grpc.MethodDesc{ { MethodName: "WriteLog", Handler: _LogService_WriteLog_Handler, }, }, Streams: []grpc.StreamDesc{}, Metadata: "logs.proto", } ================================================ FILE: logger-service/logs/readme.md ================================================ ## gRPC stuff Install binaries: ``` go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.27 go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2 ``` Generate proto. Then, run command (inside logs directory): ``` protoc --go_out=. \ --go_opt=paths=source_relative \ --go-grpc_out=. \ --go-grpc_opt=paths=source_relative \ logs.proto ``` ================================================ FILE: logger-service/templates/base.layout.gohtml ================================================ {{define "base" }} Logger Service {{block "content" .}} {{end}} {{block "js" .}} {{end}} {{end}} ================================================ FILE: logger-service/templates/dashboard.page.gohtml ================================================ {{template "base" .}} {{define "content"}} {{$logs := index .Data "logs"}}

Dashboard

{{if gt (len $logs) 0}} {{range $logs}} {{end}} {{else}} {{end}}
ID Name Created Updated Update
{{.ID}} {{.Name}} {{.CreatedAt.Format "2006-01-02 03:04:05"}} UTC {{.UpdatedAt.Format "2006-01-02 03:04:05"}} UTC Update timestamp
No entries
{{end}} {{define "js"}} {{end}} ================================================ FILE: logger-service/templates/entry.page.gohtml ================================================ {{template "base" .}} {{define "content"}} {{$entry := index .Data "entry"}}

Log Entry

ID: {{$entry.ID}}
Event: {{$entry.Name}}
Date/Time: {{$entry.CreatedAt.Format "2006-01-02 03:04:05" }} UTC
Details:
{{$entry.Data}}
{{end}} ================================================ FILE: logger-service/templates/login.page.gohtml ================================================ {{template "base" .}} {{define "content"}}

Login

{{end}} {{define "js"}} {{end}} ================================================ FILE: logger-service.dockerfile ================================================ FROM alpine:latest RUN mkdir /app RUN mkdir /templates COPY logger-service/logServiceApp /app COPY logger-service/templates/. /templates # Run the server executable CMD [ "/app/logServiceApp" ] ================================================ FILE: mail-service/cmd/api/discover.go ================================================ package main import ( "context" "fmt" clientv3 "go.etcd.io/etcd/client/v3" "log" "time" ) // registerService registers the correct entry for this service in etcd func (app *Config) registerService() { cli, _ := connectToEtcd() kv := clientv3.NewKV(cli) app.Etcd = cli lease := clientv3.NewLease(cli) grantResp, err := lease.Grant(context.TODO(), 10) if err != nil { log.Println("Error creating lease", err) } // insert something with the lease _, err = kv.Put(context.TODO(), fmt.Sprintf("/mail/%s", app.randomString(32)), "mail-service", clientv3.WithLease(grantResp.ID)) if err != nil { log.Println("Error inserting using lease", err) } // keep lease alive kalRes, err := lease.KeepAlive(context.TODO(), grantResp.ID) if err != nil { log.Println("Error with keepalive", err) } go app.listenToKeepAlive(kalRes) } func (app *Config) listenToKeepAlive(kalRes <-chan *clientv3.LeaseKeepAliveResponse) { defer func() { if r := recover(); r != nil { log.Println("Error", fmt.Sprintf("%v", r)) } }() for { _ = <-kalRes } } // connectToEtcd tries to connect to etcd, for up to 30 seconds func connectToEtcd() (*clientv3.Client, error) { var cli *clientv3.Client var counts = 0 for { c, err := clientv3.New(clientv3.Config{Endpoints: []string{"etcd:2379"}, DialTimeout: 5 * time.Second, }) if err != nil { fmt.Println("etcd not ready...") counts++ } else { fmt.Println() cli = c break } if counts > 15 { return nil, err } fmt.Println("Backing off for 2 seconds...") time.Sleep(2 * time.Second) continue } log.Println("Connected to etcd!") return cli, nil } ================================================ FILE: mail-service/cmd/api/handlers.go ================================================ package main import ( "log" "net/http" ) // SendMail receives a json payload for a message, and sends it func (app *Config) SendMail(w http.ResponseWriter, r *http.Request) { type mailMessage struct { From string `json:"from"` To string `json:"to"` Subject string `json:"subject"` Message string `json:"message"` } var requestPayload mailMessage err := app.readJSON(w, r, &requestPayload) if err != nil { log.Println(err) _ = app.errorJSON(w, err) return } msg := Message{ From: requestPayload.From, To: requestPayload.To, Subject: requestPayload.Subject, Data: requestPayload.Message, } err = app.Mailer.SendSMTPMessage(msg) if err != nil { log.Println(err) _ = app.errorJSON(w, err) return } payload := jsonResponse{ Error: false, Message: "sent to " + requestPayload.To, } _ = app.writeJSON(w, http.StatusAccepted, payload) } ================================================ FILE: mail-service/cmd/api/helpers.go ================================================ package main import ( "crypto/rand" "encoding/json" "errors" "io" "net/http" ) const randomStringSource = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0987654321_+" type jsonResponse struct { Error bool `json:"error"` Message string `json:"message"` Data any `json:"data,omitempty"` } // readJSON tries to read the body of a request and converts it into JSON func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error { maxBytes := 1048576 // one megabyte r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes)) dec := json.NewDecoder(r.Body) err := dec.Decode(data) if err != nil { return err } err = dec.Decode(&struct{}{}) if err != io.EOF { return errors.New("body must have only a single json value") } return nil } // writeJSON takes a response status code and arbitrary data and writes a json response to the client func (app *Config) writeJSON(w http.ResponseWriter, status int, data any, headers ...http.Header) error { out, err := json.Marshal(data) if err != nil { return err } if len(headers) > 0 { for key, value := range headers[0] { w.Header()[key] = value } } w.Header().Set("Content-Type", "application/json") w.WriteHeader(status) _, err = w.Write(out) if err != nil { return err } return nil } // errorJSON takes an error, and optionally a response status code, and generates and sends // a json error response func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error { statusCode := http.StatusBadRequest if len(status) > 0 { statusCode = status[0] } var payload jsonResponse payload.Error = true payload.Message = err.Error() return app.writeJSON(w, statusCode, payload) } // randomString returns a random string of letters of length n func (app *Config) randomString(n int) string { s, r := make([]rune, n), []rune(randomStringSource) for i := range s { p, _ := rand.Prime(rand.Reader, len(r)) x, y := p.Uint64(), uint64(len(r)) s[i] = r[x%y] } return string(s) } ================================================ FILE: mail-service/cmd/api/mailer.go ================================================ package main import ( "bytes" "github.com/vanng822/go-premailer/premailer" mail "github.com/xhit/go-simple-mail/v2" "html/template" "time" ) // Mail holds the information necessary to connect to an SMTP server type Mail struct { Domain string Host string Port int Username string Password string Encryption string FromAddress string FromName string } // Message is the type for an email message type Message struct { From string FromName string To string Subject string Attachments []string Data any DataMap map[string]any } // SendSMTPMessage builds and sends an email message using SMTP. This is called by ListenForMail, // and can also be called directly when necessary func (m *Mail) SendSMTPMessage(msg Message) error { if msg.From == "" { msg.From = m.FromAddress } if msg.FromName == "" { msg.FromName = m.FromName } data := map[string]any{ "message": msg.Data, } msg.DataMap = data formattedMessage, err := m.buildHTMLMessage(msg) if err != nil { return err } plainMessage, err := m.buildPlainTextMessage(msg) if err != nil { return err } server := mail.NewSMTPClient() server.Host = m.Host server.Port = m.Port server.Username = m.Username server.Password = m.Password server.Encryption = m.getEncryption(m.Encryption) server.KeepAlive = false server.ConnectTimeout = 10 * time.Second server.SendTimeout = 10 * time.Second smtpClient, err := server.Connect() if err != nil { return err } email := mail.NewMSG() email.SetFrom(msg.From). AddTo(msg.To). SetSubject(msg.Subject) email.SetBody(mail.TextPlain, plainMessage) email.AddAlternative(mail.TextHTML, formattedMessage) // add attachments, if any if len(msg.Attachments) > 0 { for _, x := range msg.Attachments { email.AddAttachment(x) } } err = email.Send(smtpClient) if err != nil { return err } return nil } // buildHTMLMessage creates the html version of the message func (m *Mail) buildHTMLMessage(msg Message) (string, error) { templateToRender := "./templates/mail.html.tmpl" t, err := template.New("email-html").ParseFiles(templateToRender) if err != nil { return "", err } var tpl bytes.Buffer if err = t.ExecuteTemplate(&tpl, "body", msg.DataMap); err != nil { return "", err } formattedMessage := tpl.String() formattedMessage, err = m.inlineCSS(formattedMessage) if err != nil { return "", err } return formattedMessage, nil } // buildPlainTextMessage creates the plaintext version of the message func (m *Mail) buildPlainTextMessage(msg Message) (string, error) { templateToRender := "./templates/mail.plain.tmpl" t, err := template.New("email-plain").ParseFiles(templateToRender) if err != nil { return "", err } var tplPlain bytes.Buffer if err = t.ExecuteTemplate(&tplPlain, "body", msg.DataMap); err != nil { return "", err } plainMessage := tplPlain.String() return plainMessage, nil } // getEncryption returns the appropriate encryption type based on a string value func (m *Mail) getEncryption(e string) mail.Encryption { switch e { case "tls": return mail.EncryptionSTARTTLS case "ssl": return mail.EncryptionSSLTLS case "none", "": return mail.EncryptionNone default: return mail.EncryptionSTARTTLS } } // inlineCSS takes html input as a string, and inlines css where possible func (m *Mail) inlineCSS(s string) (string, error) { options := premailer.Options{ RemoveClasses: false, CssToAttributes: false, KeepBangImportant: true, } prem, err := premailer.NewPremailerFromString(s, &options) if err != nil { return "", err } html, err := prem.Transform() if err != nil { return "", err } return html, nil } ================================================ FILE: mail-service/cmd/api/main.go ================================================ package main import ( "fmt" clientv3 "go.etcd.io/etcd/client/v3" "log" "net/http" "os" "strconv" ) const webPort = "80" // Config is the application Config, shared with functions by using it as a receiver type Config struct { Mailer Mail Etcd *clientv3.Client } func main() { // create our configuration app := Config{ Mailer: createMail(), } log.Println("Starting mail-service on port", webPort) // define a server that listens on port 80 and uses our routes() srv := &http.Server{ Addr: fmt.Sprintf(":%s", webPort), Handler: app.routes(), } // connect to etcd and register service app.registerService() defer app.Etcd.Close() err := srv.ListenAndServe() if err != nil { log.Panic(err) } } // createMail creates a variable of type Mail and populates its values. // Typically, this kind of information comes from the environment, or from // command line parameters. func createMail() Mail { port, _ := strconv.Atoi(os.Getenv("MAIL_PORT")) s := Mail{ Domain: os.Getenv("MAIL_DOMAIN"), Host: os.Getenv("MAIL_HOST"), Port: port, Username: os.Getenv("MAIL_USERNAME"), Password: os.Getenv("MAIL_PASSWORD"), Encryption: os.Getenv("MAIL_ENCRYPTION"), FromName: os.Getenv("FROM_NAME"), FromAddress: os.Getenv("FROM_ADDRESS"), } return s } ================================================ FILE: mail-service/cmd/api/routes.go ================================================ package main import ( "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-chi/cors" "net/http" ) func (app *Config) routes() http.Handler { mux := chi.NewRouter() mux.Use(middleware.Heartbeat("/ping")) // specify who is allowed to connect to our API service mux.Use(cors.Handler(cors.Options{ AllowedOrigins: []string{"http://*", "https://*"}, AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}, AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, ExposedHeaders: []string{"Link"}, AllowCredentials: true, MaxAge: 300, })) mux.Post("/send", app.SendMail) return mux } ================================================ FILE: mail-service/go.mod ================================================ module mail-service go 1.18 require ( github.com/go-chi/chi/v5 v5.0.7 github.com/go-chi/cors v1.2.0 github.com/vanng822/go-premailer v1.20.1 github.com/xhit/go-simple-mail/v2 v2.11.0 go.etcd.io/etcd/client/v3 v3.5.2 ) require ( github.com/PuerkitoBio/goquery v1.8.0 // indirect github.com/andybalholm/cascadia v1.3.1 // indirect github.com/coreos/go-semver v0.3.0 // indirect github.com/coreos/go-systemd/v22 v22.3.2 // indirect github.com/davecgh/go-spew v1.1.1 // indirect github.com/go-test/deep v1.0.8 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/gorilla/css v1.0.0 // indirect github.com/stretchr/testify v1.7.0 // indirect github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208 // indirect github.com/vanng822/css v1.0.1 // indirect go.etcd.io/etcd/api/v3 v3.5.2 // indirect go.etcd.io/etcd/client/pkg/v3 v3.5.2 // indirect go.uber.org/atomic v1.9.0 // indirect go.uber.org/multierr v1.8.0 // indirect go.uber.org/zap v1.21.0 // indirect golang.org/x/net v0.0.0-20220325170049-de3da57026de // indirect golang.org/x/sys v0.0.0-20220328115105-d36c6a25d886 // indirect golang.org/x/text v0.3.7 // indirect google.golang.org/genproto v0.0.0-20220328150716-24ca77f39d1f // indirect google.golang.org/grpc v1.45.0 // indirect google.golang.org/protobuf v1.28.0 // indirect ) ================================================ FILE: mail-service/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/PuerkitoBio/goquery v1.5.1 h1:PSPBGne8NIUWw+/7vFBV+kG2J/5MOjbzc7154OaKCSE= github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc= github.com/PuerkitoBio/goquery v1.8.0 h1:PJTF7AmFCFKk1N6V6jmKfrNH9tV5pNE6lZMkG0gta/U= github.com/PuerkitoBio/goquery v1.8.0/go.mod h1:ypIiRMtY7COPGk+I/YbZLbxsxn9g5ejnI2HSMtkjZvI= github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= github.com/andybalholm/cascadia v1.1.0 h1:BuuO6sSfQNFRu1LppgbD25Hr2vLYW25JvxHs5zzsLTo= github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y= github.com/andybalholm/cascadia v1.3.1 h1:nhxRkql1kdYCc8Snf7D5/D3spOX+dBgjA6u8x004T2c= github.com/andybalholm/cascadia v1.3.1/go.mod h1:R4bJ1UQfqADjvDa4P6HZHLh/3OxWWEqc0Sk8XGwHqvA= github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA= github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk= github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI= github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM= github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk= github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI= github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385/go.mod h1:0vRUJqYpeSZifjYj7uP3BG/gKcuzL9xWVV/Y+cK33KM= github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98= github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0= github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8= github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/go-chi/cors v1.2.0 h1:tV1g1XENQ8ku4Bq3K9ub2AtgG+p16SmzeMSGTwrOKdE= github.com/go-chi/cors v1.2.0/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY= github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE= github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk= github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A= github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= github.com/go-test/deep v1.0.8 h1:TDsG77qcSprGbC6vTN8OuXp5g+J+b5Pcguhf7Zt61VM= github.com/go-test/deep v1.0.8/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE= github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw= github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8= github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA= github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs= github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w= github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0= github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8= github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI= github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI= github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk= github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw= github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY= github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M= github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU= github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU= github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg= github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/gorilla/css v1.0.0 h1:BQqNyPTi50JCFMTw/b67hByjMVXZRwGha6wxVGkeihY= github.com/gorilla/css v1.0.0/go.mod h1:Dn721qIggHpt4+EFCcTLTU/vk5ySda2ReITrtgBl60c= github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk= github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw= github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4= github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU= github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w= github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM= github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8= github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck= github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ= github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ= github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc= github.com/kr/pretty v0.1.0/go.mod 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h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= ================================================ FILE: mail-service/templates/mail.html.tmpl ================================================ {{define "body"}}

{{.message}}

{{end}} ================================================ FILE: mail-service/templates/mail.plain.tmpl ================================================ {{define "body"}} {{.message}} {{end}} ================================================ FILE: mail-service.dockerfile ================================================ FROM alpine:latest RUN mkdir /app RUN mkdir /templates COPY mail-service/mailerServiceApp /app COPY mail-service/templates /templates # Run the server executable CMD [ "/app/mailerServiceApp" ] ================================================ FILE: multistage-dockerfiles/authentication-service.dockerfile ================================================ # The base go-image FROM golang:1.18-alpine as builder # create a directory for the app RUN mkdir /app # copy all files from the current directory to the app directory COPY authentication-service/. /app # set working directory WORKDIR /app # build executable RUN CGO_ENABLED=0 go build -o authApp . RUN chmod +x /app/authApp # create a tiny image for use FROM alpine:latest RUN mkdir /app COPY --from=builder /app/authApp /app # Run the server executable CMD [ "/app/authApp" ] ================================================ FILE: multistage-dockerfiles/broker-service.dockerfile ================================================ # The base go-image FROM golang:1.18-alpine as builder # create a directory for the app RUN mkdir /app # copy all files from the current directory to the app directory COPY broker-service/. /app # set working directory WORKDIR /app # build executable RUN CGO_ENABLED=0 go build -o brokerApp ./cmd/api RUN chmod +x /app/brokerApp # create a tiny image for use FROM alpine:latest RUN mkdir /app COPY --from=builder /app/brokerApp /app # Run the server executable CMD [ "/app/brokerApp" ] ================================================ FILE: multistage-dockerfiles/listener-service.dockerfile ================================================ # The base go-image FROM golang:1.18-alpine as builder # create a directory for the app RUN mkdir /app # copy all files from the current directory to the app directory COPY listener-service /app # set working directory WORKDIR /app # build executable RUN CGO_ENABLED=0 go build -o listener . RUN chmod +x /app/listener # create a tiny image for use FROM alpine:latest RUN mkdir /app COPY --from=builder /app/listener /app # Run the server executable CMD [ "/app/listener" ] ================================================ FILE: multistage-dockerfiles/logger-service.dockerfile ================================================ # The base go-image FROM golang:1.18-alpine as builder # create a directory for the app RUN mkdir /app # copy all files from the current directory to the app directory COPY logger-service/. /app # set working directory WORKDIR /app # build executable RUN CGO_ENABLED=0 go build -o logServiceApp ./cmd/web RUN chmod +x /app/logServiceApp # create a tiny image for use FROM alpine:latest RUN mkdir /app RUN mkdir /templates COPY --from=builder /app/logServiceApp /app COPY --from=builder /app/templates/. /templates # Run the server executable CMD [ "/app/logServiceApp" ] ================================================ FILE: multistage-dockerfiles/mail-service.dockerfile ================================================ # The base go-image FROM golang:1.18-alpine as builder # create a directory for the app RUN mkdir /app # copy all files from the current directory to the app directory COPY mail-service/. /app # set working directory WORKDIR /app # build executable RUN CGO_ENABLED=0 go build -o mailerServiceApp . RUN chmod +x /app/mailerServiceApp # create a tiny image for use FROM alpine:latest RUN mkdir /app RUN mkdir /templates COPY --from=builder /app/mailerServiceApp /app COPY --from=builder /app/templates /templates # Run the server executable CMD [ "/app/mailerServiceApp" ] ================================================ FILE: postgres.yml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: postgres spec: replicas: 1 selector: matchLabels: app: postgres template: metadata: labels: app: postgres spec: containers: - name: postgres image: "postgres:14.0" env: - name: POSTGRES_USER value: "postgres" - name: POSTGRES_PASSWORD value: "password" - name: "POSTGRES_DB" value: "users" ports: - containerPort: 5432 --- apiVersion: v1 kind: Service metadata: name: postgres spec: selector: app: postgres ports: - protocol: TCP port: 5432 targetPort: 5432 ================================================ FILE: swarm.md ================================================ # Docker swarm ## Build images: ```bash docker build -f front-end.dockerfile -t tsawler/front-end:tag1 . docker push tsawler/front-end:tag1 ``` ## Manage ```bash docker swarm init docker swarm join-token worker docker swarm join-token manager docker stack deploy -c .yml docker service ls watch docker service ls docker service scale = ``` ## Updating (pull image and scale first) ```bash docker service update --image tsawler/listener:1.0.1 myapp_listener-service ``` ## Bringing swarm down Easy method: ```bash docker stack rm myapp ``` To stop them, scale all services to 0, or just type ```bash docker swarm leave ``` ================================================ FILE: swarm.yml ================================================ version: '3' services: caddy: image: tsawler/micro-caddy:1.0.0 deploy: mode: replicated replicas: 1 placement: constraints: - node.hostname == docker-desktop volumes: - caddy_data:/data - caddy_config:/config ports: - "80:80" - "444:443" front-end: image: tsawler/front-end:1.0.0 deploy: mode: replicated replicas: 1 # broker-service - main entry point; we call this from the front end broker-service: image: tsawler/broker-service:1.0.1 ports: - "8080:80" deploy: mode: replicated replicas: 1 # listener-service - watches rabbitmq for messages listener-service: image: tsawler/listener-service:1.0.0 deploy: mode: replicated replicas: 2 # authentication-service - handles user auth authentication-service: image: tsawler/authentication-service:1.0.0 deploy: mode: replicated replicas: 1 environment: DSN: "host=postgres port=5432 user=postgres password=password dbname=users sslmode=disable timezone=UTC connect_timeout=5" # logger-service: a service to store logs logger-service: image: tsawler/logger-service:1.0.0 ports: - "8082:80" deploy: mode: replicated replicas: 1 volumes: - ./logger-service/templates/:/app/templates # mail-service - handles sending mail mail-service: image: tsawler/mail-service:1.0.0 deploy: mode: replicated replicas: 1 environment: MAIL_DOMAIN: localhost MAIL_HOST: mailhog MAIL_PORT: 1025 MAIL_ENCRYPTION: none MAIL_USERNAME: "" MAIL_PASSWORD: "" FROM_NAME: "John Smith" FROM_ADDRESS: john.smith@example.com # rabbitmq: the rabbitmq server rabbitmq: image: 'rabbitmq:3-management' deploy: mode: global volumes: - ./db-data/rabbitmq/:/var/lib/rabbitmq/ # mailhog: a fake smtp server with a web interface mailhog: image: 'mailhog/mailhog:latest' ports: - "8025:8025" deploy: mode: global # mongo: start MongoDB and ensure that data is stored to a mounted volume mongo: image: 'mongo:4.2.17-bionic' ports: - "27017:27017" deploy: mode: global environment: MONGO_INITDB_DATABASE: logs MONGO_INITDB_ROOT_USERNAME: admin MONGO_INITDB_ROOT_PASSWORD: password volumes: - ./db-data/mongo/:/data/db # postgres: start Postgres, and ensure that data is stored to a mounted volume postgres: image: 'postgres:14.2' ports: - "5432:5432" deploy: mode: global environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: password POSTGRES_DB: users volumes: - ./db-data/postgres/:/var/lib/postgresql/data/ # etcd: start etcd server etcd: image: docker.io/bitnami/etcd:3 environment: - ALLOW_NONE_AUTHENTICATION=yes deploy: mode: global volumes: - ./db-data/etcd/:/bitnami/etcd volumes: caddy_data: external: true caddy_config: