main 23c61bba9a4c cached
20 files
34.2 KB
9.0k tokens
13 symbols
1 requests
Download .txt
Repository: dockersamples/k8s-wordsmith-demo
Branch: main
Commit: 23c61bba9a4c
Files: 20
Total size: 34.2 KB

Directory structure:
gitextract_78thyfox/

├── .github/
│   ├── dependabot.yml
│   └── workflows/
│       ├── call-docker-build-api.yaml
│       └── call-docker-build-web.yaml
├── LICENSE
├── README.md
├── api/
│   ├── .dockerignore
│   ├── Dockerfile
│   ├── pom.xml
│   └── src/
│       └── main/
│           └── java/
│               └── Main.java
├── db/
│   └── words.sql
├── docker-compose.yml
├── k8s-manifests/
│   ├── api.yaml
│   ├── db.yaml
│   └── web.yaml
├── kustomization.yaml
└── web/
    ├── Dockerfile
    ├── dispatcher.go
    └── static/
        ├── app.js
        ├── index.html
        └── style.css

================================================
FILE CONTENTS
================================================

================================================
FILE: .github/dependabot.yml
================================================
version: 2
updates:
  # Maintain dependencies for GitHub Actions
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "monthly"


================================================
FILE: .github/workflows/call-docker-build-api.yaml
================================================
name: Build API
# template source: https://github.com/dockersamples/.github/blob/main/templates/call-docker-build.yaml

on:
  # we want pull requests so we can build(test) but not push to image registry
  push:
    branches:
      - 'main'
    # only build when important files change
    paths:
      - 'api/**'
      - '.github/workflows/call-docker-build-api.yaml'
  pull_request:
    branches:
      - 'main'
    # only build when important files change
    paths:
      - 'api/**'
      - '.github/workflows/call-docker-build-api.yaml'

jobs:
  call-docker-build:

    name: API Call Docker Build

    uses: dockersamples/.github/.github/workflows/reusable-docker-build.yaml@main

    permissions:
      contents: read
      packages: write # needed to push docker image to ghcr.io
      pull-requests: write # needed to create and update comments in PRs
    
    secrets:

      # Only needed if with:dockerhub-enable is true below
      dockerhub-username: ${{ secrets.DOCKERHUB_USERNAME }}

      # Only needed if with:dockerhub-enable is true below
      dockerhub-token: ${{ secrets.DOCKERHUB_TOKEN }}

    with:
      
      ### REQUIRED
      ### ENABLE ONE OR BOTH REGISTRIES
      ### tell docker where to push.
      ### NOTE if Docker Hub is set to true, you must set secrets above and also add account/repo/tags below
      dockerhub-enable: true
      ghcr-enable: true

      ### REQUIRED 
      ### A list of the account/repo names for docker build. List should match what's enabled above
      ### defaults to:
      image-names: |
        ghcr.io/dockersamples/wordsmith-api
        dockersamples/wordsmith-api
        dockersamples/k8s-wordsmith-api
      
      ### REQUIRED set rules for tagging images, based on special action syntax:
      ### https://github.com/docker/metadata-action#tags-input
      ### defaults to:
      tag-rules: |
        type=raw,value=latest,enable=${{ endsWith(github.ref, github.event.repository.default_branch) }}
        type=ref,event=pr
      
      ### path to where docker should copy files into image
      ### defaults to root of repository (.)
      context: api
      
      ### Dockerfile alternate name. Default is Dockerfile (relative to context path)
      # file: Containerfile

      ### build stage to target, defaults to empty, which builds to last stage in Dockerfile
      # target:
      
      ### platforms to build for, defaults to linux/amd64
      ### other options: linux/amd64,linux/arm64,linux/arm/v7
      platforms: linux/amd64,linux/arm64
      
      ### Create a PR comment with image tags and labels
      ### defaults to false
      # comment-enable: false


================================================
FILE: .github/workflows/call-docker-build-web.yaml
================================================
name: Build Web
# template source: https://github.com/dockersamples/.github/blob/main/templates/call-docker-build.yaml

on:
  # we want pull requests so we can build(test) but not push to image registry
  push:
    branches:
      - 'main'
    # only build when important files change
    paths:
      - 'web/**'
      - '.github/workflows/call-docker-build-web.yaml'
  pull_request:
    branches:
      - 'main'
    # only build when important files change
    paths:
      - 'web/**'
      - '.github/workflows/call-docker-build-web.yaml'

jobs:
  call-docker-build:

    name: Web Call Docker Build

    uses: dockersamples/.github/.github/workflows/reusable-docker-build.yaml@main

    permissions:
      contents: read
      packages: write # needed to push docker image to ghcr.io
      pull-requests: write # needed to create and update comments in PRs
    
    secrets:

      # Only needed if with:dockerhub-enable is true below
      dockerhub-username: ${{ secrets.DOCKERHUB_USERNAME }}

      # Only needed if with:dockerhub-enable is true below
      dockerhub-token: ${{ secrets.DOCKERHUB_TOKEN }}

    with:
      
      ### REQUIRED
      ### ENABLE ONE OR BOTH REGISTRIES
      ### tell docker where to push.
      ### NOTE if Docker Hub is set to true, you must set secrets above and also add account/repo/tags below
      dockerhub-enable: true
      ghcr-enable: true

      ### REQUIRED 
      ### A list of the account/repo names for docker build. List should match what's enabled above
      ### defaults to:
      image-names: |
        ghcr.io/dockersamples/wordsmith-web
        dockersamples/wordsmith-web
        dockersamples/k8s-wordsmith-web
      
      ### REQUIRED set rules for tagging images, based on special action syntax:
      ### https://github.com/docker/metadata-action#tags-input
      ### defaults to:
      tag-rules: |
        type=raw,value=latest,enable=${{ endsWith(github.ref, github.event.repository.default_branch) }}
        type=ref,event=pr
      
      ### path to where docker should copy files into image
      ### defaults to root of repository (.)
      context: web
      
      ### Dockerfile alternate name. Default is Dockerfile (relative to context path)
      # file: Containerfile

      ### build stage to target, defaults to empty, which builds to last stage in Dockerfile
      # target:
      
      ### platforms to build for, defaults to linux/amd64
      ### other options: linux/amd64,linux/arm64,linux/arm/v7
      platforms: linux/amd64,linux/arm64,linux/arm/v7
      
      ### Create a PR comment with image tags and labels
      ### defaults to false
      # comment-enable: false


================================================
FILE: LICENSE
================================================
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

      "Licensor" shall mean the copyright owner or entity authorized by
      the copyright owner that is granting the License.

      "Legal Entity" shall mean the union of the acting entity and all
      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.

      "You" (or "Your") shall mean an individual or Legal Entity
      exercising permissions granted by this License.

      "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.

      "Object" form shall mean any form resulting from mechanical
      transformation or translation of a Source form, including but
      not limited to compiled object code, generated documentation,
      and conversions to other media types.

      "Work" shall mean the work of authorship, whether in Source or
      Object form, made available under the License, as indicated by a
      copyright notice that is included in or attached to the work
      (an example is provided in the Appendix below).

      "Derivative Works" shall mean any work, whether in Source or Object
      form, that is based on (or derived from) the Work and for which the
      editorial revisions, annotations, elaborations, or other modifications
      represent, as a whole, an original work of authorship. For the purposes
      of this License, Derivative Works shall not include works that remain
      separable from, or merely link (or bind by name) to the interfaces of,
      the Work and Derivative Works thereof.

      "Contribution" shall mean any work of authorship, including
      the original version of the Work and any modifications or additions
      to that Work or Derivative Works thereof, that is intentionally
      submitted to Licensor for inclusion in the Work by the copyright owner
      or by an individual or Legal Entity authorized to submit on behalf of
      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the
      Licensor for the purpose of discussing and improving the Work, but
      excluding communication that is conspicuously marked or otherwise
      designated in writing by the copyright owner as "Not a Contribution."

      "Contributor" shall mean Licensor and any individual or Legal Entity
      on behalf of whom a Contribution has been received by Licensor and
      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the
      Work and such Derivative Works in Source or Object form.

   3. Grant of Patent License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable
      by such Contributor that are necessarily infringed by their
      Contribution(s) alone or by combination of their Contribution(s)
      with the Work to which such Contribution(s) was submitted. If You
      institute patent litigation against any entity (including a
      cross-claim or counterclaim in a lawsuit) alleging that the Work
      or a Contribution incorporated within the Work constitutes direct
      or contributory patent infringement, then any patent licenses
      granted to You under this License for that Work shall terminate
      as of the date such litigation is filed.

   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You
      meet the following conditions:

      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
          attribution notices from the Source form of the Work,
          excluding those notices that do not pertain to any part of
          the Derivative Works; and

      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
          include a readable copy of the attribution notices contained
          within such NOTICE file, excluding those notices that do not
          pertain to any part of the Derivative Works, in at least one
          of the following places: within a NOTICE text file distributed
          as part of the Derivative Works; within the Source form or
          documentation, if provided along with the Derivative Works; or,
          within a display generated by the Derivative Works, if and
          wherever such third-party notices normally appear. The contents
          of the NOTICE file are for informational purposes only and
          do not modify the License. You may add Your own attribution
          notices within Derivative Works that You distribute, alongside
          or as an addendum to the NOTICE text from the Work, provided
          that such additional attribution notices cannot be construed
          as modifying the License.

      You may add Your own copyright statement to Your modifications and
      may provide additional or different license terms and conditions
      for use, reproduction, or distribution of Your modifications, or
      for any such Derivative Works as a whole, provided Your use,
      reproduction, and distribution of the Work otherwise complies with
      the conditions stated in this License.

   5. Submission of Contributions. Unless You explicitly state otherwise,
      any Contribution intentionally submitted for inclusion in the Work
      by You to the Licensor shall be under the terms and conditions of
      this License, without any additional terms or conditions.
      Notwithstanding the above, nothing herein shall supersede or modify
      the terms of any separate license agreement you may have executed
      with Licensor regarding such Contributions.

   6. Trademarks. This License does not grant permission to use the trade
      names, trademarks, service marks, or product names of the Licensor,
      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
      Contributor provides its Contributions) on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
      implied, including, without limitation, any warranties or conditions
      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
      PARTICULAR PURPOSE. You are solely responsible for determining the
      appropriateness of using or redistributing the Work and assume any
      risks associated with Your exercise of permissions under this License.

   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly
      negligent acts) or agreed to in writing, shall any Contributor be
      liable to You for damages, including any direct, indirect, special,
      incidental, or consequential damages of any character arising as a
      result of this License or out of the use or inability to use the
      Work (including but not limited to damages for loss of goodwill,
      work stoppage, computer failure or malfunction, or any and all
      other commercial damages or losses), even if such Contributor
      has been advised of the possibility of such damages.

   9. Accepting Warranty or Additional Liability. While redistributing
      the Work or Derivative Works thereof, You may choose to offer,
      and charge a fee for, acceptance of support, warranty, indemnity,
      or other liability obligations and/or rights consistent with this
      License. However, in accepting such obligations, You may act only
      on Your own behalf and on Your sole responsibility, not on behalf
      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

   Copyright [yyyy] [name of copyright owner]

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.


================================================
FILE: README.md
================================================
# Wordsmith App

Wordsmith is the demo project originally shown at DockerCon EU 2017 and 2018.

The demo app runs across three containers:

- **[api](api/Dockerfile)** - a Java REST API which serves words read from the database
- **[web](web/Dockerfile)** - a Go web application that calls the API and builds words into sentences
- **db** - a Postgres database that stores words

## Architecture

![Architecture diagram](architecture.excalidraw.png)

## Build and run in Docker Compose

The only requirement to build and run the app from source is Docker. Clone this repo and use Docker Compose to build all the images. You can use the new V2 Compose with `docker compose` or the classic `docker-compose` CLI:

```shell
docker compose up --build
```

Or you can pull pre-built images from Docker Hub using `docker compose pull`.


## Deploy using Kubernetes manifests

You can deploy the same app to Kubernetes using the [Kustomize configuration](./kustomization.yaml). It will define all of the necessary Deployment and Service objects and a ConfigMap to provide the database schema.

Apply the manifest using `kubectl` while at the root of the project:

```shell
kubectl apply -k .
```

Once the pods are running, browse to http://localhost:8080 and you will see the site.

Docker Desktop includes Kubernetes and the [kubectl](https://kubernetes.io/docs/reference/kubectl/overview/) command line, so you can work directly with the cluster. Check the services are up, and you should see output like this:

```text
kubectl get svc
NAME         TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
db           ClusterIP      None             <none>        55555/TCP        2m
kubernetes   ClusterIP      10.96.0.1        <none>        443/TCP          38d
web          LoadBalancer   10.107.215.211   <pending>     8080:30220/TCP   2m
words        ClusterIP      None             <none>        55555/TCP        2m
```

Check the pods are running and you should see one pod each for the database and web components and five pods for the words API:

```text
kubectl get pods
NAME                   READY     STATUS    RESTARTS   AGE
db-8678676c79-h2d99    1/1       Running   0          1m
web-5d6bfbbd8b-6zbl8   1/1       Running   0          1m
api-858f6678-6c8kk     1/1       Running   0          1m
api-858f6678-7bqbv     1/1       Running   0          1m
api-858f6678-fjdws     1/1       Running   0          1m
api-858f6678-rrr8c     1/1       Running   0          1m
api-858f6678-x9zqh     1/1       Running   0          1m
```


================================================
FILE: api/.dockerignore
================================================
.idea
target
*.iml


================================================
FILE: api/Dockerfile
================================================
# Build stage
FROM --platform=${BUILDPLATFORM} maven:3-amazoncorretto-20 as build
WORKDIR /usr/local/app
COPY pom.xml .
RUN mvn verify -DskipTests --fail-never
COPY src ./src
RUN mvn verify

# Run stage
FROM --platform=${TARGETPLATFORM} amazoncorretto:20
WORKDIR /usr/local/app
COPY --from=build /usr/local/app/target .
ENTRYPOINT ["java", "-Xmx8m", "-Xms8m", "-jar", "/usr/local/app/words.jar"]
EXPOSE 8080


================================================
FILE: api/pom.xml
================================================
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>codestory</groupId>
    <artifactId>words</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>

    <build>
        <finalName>words</finalName>

        <pluginManagement>
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.2.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.10.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.3.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.19.1</version>
                </plugin>
            </plugins>
        </pluginManagement>

        <plugins>
            <plugin>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>3.4.0</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.3.0</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>dependency</classpathPrefix>
                            <mainClass>Main</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>32.0.1-jre</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.7.2</version>
        </dependency>
    </dependencies>
</project>


================================================
FILE: api/src/main/java/Main.java
================================================
import com.google.common.base.Charsets;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.sql.*;
import java.util.NoSuchElementException;

public class Main {
    public static void main(String[] args) throws Exception {
        Class.forName("org.postgresql.Driver");

        HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0);
        server.createContext("/noun", handler(() -> randomWord("nouns")));
        server.createContext("/verb", handler(() -> randomWord("verbs")));
        server.createContext("/adjective", handler(() -> randomWord("adjectives")));
        server.start();
    }

    private static String randomWord(String table) {
        try (Connection connection = DriverManager.getConnection("jdbc:postgresql://db:5432/postgres", "postgres", "")) {
            try (Statement statement = connection.createStatement()) {
                try (ResultSet set = statement.executeQuery("SELECT word FROM " + table + " ORDER BY random() LIMIT 1")) {
                    while (set.next()) {
                        return set.getString(1);
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        throw new NoSuchElementException(table);
    }

    private static HttpHandler handler(Supplier<String> word) {
        return t -> {
            String response = "{\"word\":\"" + word.get() + "\"}";
            byte[] bytes = response.getBytes(Charsets.UTF_8);

            System.out.println(response);
            
            t.getResponseHeaders().add("content-type", "application/json; charset=utf-8");
            t.getResponseHeaders().add("cache-control", "private, no-cache, no-store, must-revalidate, max-age=0");
            t.getResponseHeaders().add("pragma", "no-cache");

            t.sendResponseHeaders(200, bytes.length);

            try (OutputStream os = t.getResponseBody()) {
                os.write(bytes);
            }
        };
    }
}


================================================
FILE: db/words.sql
================================================
CREATE TABLE nouns (word TEXT NOT NULL);
CREATE TABLE verbs (word TEXT NOT NULL);
CREATE TABLE adjectives (word TEXT NOT NULL);

INSERT INTO nouns(word) VALUES
  ('cloud'),
  ('elephant'),
  ('gø language'),
  ('laptøp'),
  ('cøntainer'),
  ('micrø-service'),
  ('turtle'),
  ('whale'),
  ('gøpher'),
  ('møby døck'),
  ('server'),
  ('bicycle'),
  ('viking'),
  ('mermaid'),
  ('fjørd'),
  ('legø'),
  ('flødebolle'),
  ('smørrebrød');

INSERT INTO verbs(word) VALUES
  ('will drink'),
  ('smashes'),
  ('smøkes'),
  ('eats'),
  ('walks tøwards'),
  ('løves'),
  ('helps'),
  ('pushes'),
  ('debugs'),
  ('invites'),
  ('hides'),
  ('will ship');

INSERT INTO adjectives(word) VALUES
  ('the exquisite'),
  ('a pink'),
  ('the røtten'),
  ('a red'),
  ('the serverless'),
  ('a brøken'),
  ('a shiny'),
  ('the pretty'),
  ('the impressive'),
  ('an awesøme'),
  ('the famøus'),
  ('a gigantic'),
  ('the gløriøus'),
  ('the nørdic'),
  ('the welcøming'),
  ('the deliciøus');


================================================
FILE: docker-compose.yml
================================================
version: '3.9'
# we'll keep the version for now to work in Compose and Swarm

services:
  db:
    image: postgres:10.0-alpine
    volumes:
      - ./db:/docker-entrypoint-initdb.d/

  api:
    build: api
    image: dockersamples/wordsmith-api
    deploy:
      replicas: 5

  web:
    build: web
    image: dockersamples/wordsmith-web
    ports:
     - "8080:80"

================================================
FILE: k8s-manifests/api.yaml
================================================
apiVersion: v1
kind: Service
metadata:
  name: api
  labels:
    app: api
spec:
  ports:
    - port: 8080
      targetPort: 8080
      name: api
  selector:
    app: api
  clusterIP: None
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: api
  labels:
    app: api
spec:
  replicas: 5
  selector:
    matchLabels:
      app: api
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
        - name: api
          image: dockersamples/wordsmith-api
          ports:
            - containerPort: 8080
              name: api

================================================
FILE: k8s-manifests/db.yaml
================================================
apiVersion: v1
kind: Service
metadata:
  name: db
  labels:
    app: db
spec:
  ports:
    - port: 5432
      targetPort: 5432
      name: db
  selector:
    app: db
  clusterIP: None
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: db
  labels:
    app: db
spec:
  selector:
    matchLabels:
      app: db
  template:
    metadata:
      labels:
        app: db
    spec:
      containers:
        - name: db
          image: postgres:10.0-alpine
          ports:
            - containerPort: 5432
              name: db
          volumeMounts:
            - name: db-schema
              mountPath: /docker-entrypoint-initdb.d
      volumes:
        - name: db-schema
          configMap:
            name: db-schema

================================================
FILE: k8s-manifests/web.yaml
================================================
apiVersion: v1
kind: Service
metadata:
  name: web
  labels:
    app: web
spec:
  ports:
    - port: 8080
      targetPort: 80
      name: web
  selector:
    app: web
  type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
  labels:
    app: web
spec:
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: dockersamples/wordsmith-web
          ports:
            - containerPort: 80
              name: web


================================================
FILE: kustomization.yaml
================================================
resources:
  - k8s-manifests/api.yaml
  - k8s-manifests/db.yaml
  - k8s-manifests/web.yaml
configMapGenerator:
  - name: db-schema
    files:
      - ./db/words.sql
generatorOptions:
  disableNameSuffixHash: true

================================================
FILE: web/Dockerfile
================================================
# BUILD
# use the build platforms matching arch rather than target arch
FROM --platform=$BUILDPLATFORM golang:alpine as builder
WORKDIR /usr/local/app
ARG TARGETARCH

COPY dispatcher.go .

# build for the target arch not the build platform host arch
RUN GOOS=linux GOARCH=$TARGETARCH go build dispatcher.go

# RUN
# defaults to using the target arch image
FROM alpine:latest
WORKDIR /usr/local/app

COPY --from=builder /usr/local/app/dispatcher ./
COPY static ./static/

EXPOSE 80
CMD ["/usr/local/app/dispatcher"]


================================================
FILE: web/dispatcher.go
================================================
package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"math/rand"
	"net"
	"net/http"
	"time"
)

func main() {
	rand.Seed(time.Now().UnixNano())

	fwd := &forwarder{"api", 8080}
	http.Handle("/words/", http.StripPrefix("/words", fwd))
	http.Handle("/", http.FileServer(http.Dir("static")))

	fmt.Println("Listening on port 80")
	http.ListenAndServe(":80", nil)
}

type forwarder struct {
	host string
	port int
}

func (f *forwarder) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	addrs, err := net.LookupHost(f.host)
	if err != nil {
		log.Println("Error", err)
		http.Error(w, err.Error(), 500)
		return
	}

	log.Printf("%s %d available ips: %v", r.URL.Path, len(addrs), addrs)
	ip := addrs[rand.Intn(len(addrs))]
	log.Printf("%s I choose %s", r.URL.Path, ip)

	url := fmt.Sprintf("http://%s:%d%s", ip, f.port, r.URL.Path)
	log.Printf("%s Calling %s", r.URL.Path, url)

	if err = copy(url, ip, w); err != nil {
		log.Println("Error", err)
		http.Error(w, err.Error(), 500)
		return
	}
}

func copy(url, ip string, w http.ResponseWriter) error {
	resp, err := http.Get(url)
	if err != nil {
		return err
	}

	for header, values := range resp.Header {
		for _, value := range values {
			w.Header().Add(header, value)
		}
	}
	w.Header().Set("source", ip)

	buf, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	_, err = w.Write(buf)
	return err
}


================================================
FILE: web/static/app.js
================================================
"use strict";

var lab = angular.module('lab', []);

lab.controller('LabCtrl', function ($scope, $http, $timeout) {
  $scope.noun1 = "";
  $scope.noun2 = "";
  $scope.adjective1 = "";
  $scope.adjective2 = "";
  $scope.verb = "";

  getWord($http, $timeout, '/words/noun?n=1', function(resp1) {
    $scope.noun1 = word(resp1);
  });

  getWord($http, $timeout, '/words/adjective?a=1', function(resp) {
    var adj = word(resp);
    adj.word = adj.word.charAt(0).toUpperCase() + adj.word.substr(1)
    $scope.adjective1 = adj;
  });

  getWord($http, $timeout, '/words/verb', function(resp) {
    $scope.verb = word(resp);
  });

  getWord($http, $timeout, '/words/noun?n=2', function(resp2) {
    $scope.noun2 = word(resp2);
  });

  getWord($http, $timeout, '/words/adjective?n=2', function(resp) {
    $scope.adjective2 = word(resp);
  });
});

function getWord($http, $timeout, url, callback) {
  $http.get(url).then(callback, function(resp) {
    $timeout(function() {
      console.log("Retry: " + url);
      getWord($http, $timeout, url, callback);
    }, 500);
  });
}

function word(resp) {
  return {
    word: resp.data.word,
    hostname: resp.headers()["source"]
  };
}


================================================
FILE: web/static/index.html
================================================
<!DOCTYPE html>
<html lang="en" ng-app="lab">
<head>
  <meta charset="utf-8">
  <title>dockercon EU 18</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div class="logo"><img src="images/logo.svg" style="width:50%"/></div>

<div class="sentence" ng-controller="LabCtrl">
  <div class="line line1 slide-in">
  <span class="result adjective slide-in">
    <span class="word slide-in" ng-bind="adjective1.word"></span>
    <span class="hostname" ng-bind="adjective1.hostname"></span>
  </span>
  <span class="result noun slide-in">
    <span class="word" ng-bind="noun1.word"></span>
    <span class="hostname" ng-bind="noun1.hostname"></span>
  </span>
  </div>
  <div class="line line2 slide-in">
  <span class="result verb slide-in">
    <span class="word" ng-bind="verb.word"></span>
    <span class="hostname" ng-bind="verb.hostname"></span>
  </span>
  </div>
  <div class="line line3 slide-in">
  <span class="result adjective slide-in">
    <span class="word" ng-bind="adjective2.word"></span>
    <span class="hostname" ng-bind="adjective2.hostname"></span>
  </span>
  <span class="result noun slide-in">
    <span class="word" ng-bind="noun2.word"></span>
    <span class="hostname" ng-bind="noun2.hostname"></span>
  </span>
  </div>
</div>

<div class="footer"><img src="images/homes.png" /></div>
</body>

<script src="angular.min.js"></script>
<script src="app.js"></script>
</html>


================================================
FILE: web/static/style.css
================================================
/* latin-ext */
@font-face {
  font-family: 'Raleway';
  font-style: normal;
  font-weight: 400;
  src: local('Raleway'), local('Raleway-Regular'), url('fonts/font1.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Raleway';
  font-style: normal;
  font-weight: 400;
  src: local('Raleway'), local('Raleway-Regular'), url('fonts/font2.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}

body {
	text-align: center;
	margin: 0;
	padding: 0;
	background-color: #001f5b;
}

.logo {
	margin-top: 30px;
}

.footer {
	position: absolute;
	bottom: 0;
	width: 100%;
	z-index: -1;
	opacity: 0.5;
}

.footer img {
	max-width: 100%;
	vertical-align: middle;
}

.sentence {
	margin: 70px auto 0 auto;
}

.line {
	margin-bottom: 30px;
	transform: translateX(-100%) rotate(-20deg);
}

.slide-in {
    animation: slide-in .5s forwards ease-in;
}

.line3.slide-in {
    animation: slide-in 1s forwards ease-in;
}

.line2.slide-in {
    animation: slide-in 1.2s forwards ease-in;
}

@keyframes slide-in {
  100% {
		transform: translateX(0%);
	}
}

.result {
	position: relative;
	display: inline-block;
	padding: 0 20px;
	margin: 0 10px;
	color: white;
	height: 175px;
	width: 330px;
}

.result .word {
	display: inline-block;
	font-family: 'Raleway', sans-serif;
	font-size: 45px;
	color: white;
	line-height: 155px;
	height: 175px;
	vertical-align: middle;
	margin-top: 20px;
}

.result .hostname {
	position: absolute;
	width: 100%;
	left: 0;
	bottom: 8px;
	font-size: 0.8em;
	height: 14px;
}

.noun {
	background-image: url('images/lego_blue.png') !important;
}

.verb {
	background-image: url('images/lego_yellow.png') !important;
}

.adjective {
	background-image: url('images/lego_light_blue.png') !important;
}
Download .txt
gitextract_78thyfox/

├── .github/
│   ├── dependabot.yml
│   └── workflows/
│       ├── call-docker-build-api.yaml
│       └── call-docker-build-web.yaml
├── LICENSE
├── README.md
├── api/
│   ├── .dockerignore
│   ├── Dockerfile
│   ├── pom.xml
│   └── src/
│       └── main/
│           └── java/
│               └── Main.java
├── db/
│   └── words.sql
├── docker-compose.yml
├── k8s-manifests/
│   ├── api.yaml
│   ├── db.yaml
│   └── web.yaml
├── kustomization.yaml
└── web/
    ├── Dockerfile
    ├── dispatcher.go
    └── static/
        ├── app.js
        ├── index.html
        └── style.css
Download .txt
SYMBOL INDEX (13 symbols across 4 files)

FILE: api/src/main/java/Main.java
  class Main (line 12) | public class Main {
    method main (line 13) | public static void main(String[] args) throws Exception {
    method randomWord (line 23) | private static String randomWord(String table) {
    method handler (line 39) | private static HttpHandler handler(Supplier<String> word) {

FILE: db/words.sql
  type nouns (line 1) | CREATE TABLE nouns (word TEXT NOT NULL)
  type verbs (line 2) | CREATE TABLE verbs (word TEXT NOT NULL)
  type adjectives (line 3) | CREATE TABLE adjectives (word TEXT NOT NULL)

FILE: web/dispatcher.go
  function main (line 13) | func main() {
  type forwarder (line 24) | type forwarder struct
    method ServeHTTP (line 29) | func (f *forwarder) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  function copy (line 51) | func copy(url, ip string, w http.ResponseWriter) error {

FILE: web/static/app.js
  function getWord (line 35) | function getWord($http, $timeout, url, callback) {
  function word (line 44) | function word(resp) {
Condensed preview — 20 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (37K chars).
[
  {
    "path": ".github/dependabot.yml",
    "chars": 164,
    "preview": "version: 2\nupdates:\n  # Maintain dependencies for GitHub Actions\n  - package-ecosystem: \"github-actions\"\n    directory: "
  },
  {
    "path": ".github/workflows/call-docker-build-api.yaml",
    "chars": 2649,
    "preview": "name: Build API\n# template source: https://github.com/dockersamples/.github/blob/main/templates/call-docker-build.yaml\n\n"
  },
  {
    "path": ".github/workflows/call-docker-build-web.yaml",
    "chars": 2662,
    "preview": "name: Build Web\n# template source: https://github.com/dockersamples/.github/blob/main/templates/call-docker-build.yaml\n\n"
  },
  {
    "path": "LICENSE",
    "chars": 11357,
    "preview": "                                 Apache License\n                           Version 2.0, January 2004\n                   "
  },
  {
    "path": "README.md",
    "chars": 2548,
    "preview": "# Wordsmith App\n\nWordsmith is the demo project originally shown at DockerCon EU 2017 and 2018.\n\nThe demo app runs across"
  },
  {
    "path": "api/.dockerignore",
    "chars": 19,
    "preview": ".idea\ntarget\n*.iml\n"
  },
  {
    "path": "api/Dockerfile",
    "chars": 408,
    "preview": "# Build stage\nFROM --platform=${BUILDPLATFORM} maven:3-amazoncorretto-20 as build\nWORKDIR /usr/local/app\nCOPY pom.xml .\n"
  },
  {
    "path": "api/pom.xml",
    "chars": 3238,
    "preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<project xmlns=\"http://maven.apache.org/POM/4.0.0\"\n         xmlns:xsi=\"http://www"
  },
  {
    "path": "api/src/main/java/Main.java",
    "chars": 2176,
    "preview": "import com.google.common.base.Charsets;\nimport com.google.common.base.Supplier;\nimport com.google.common.base.Suppliers;"
  },
  {
    "path": "db/words.sql",
    "chars": 978,
    "preview": "CREATE TABLE nouns (word TEXT NOT NULL);\nCREATE TABLE verbs (word TEXT NOT NULL);\nCREATE TABLE adjectives (word TEXT NOT"
  },
  {
    "path": "docker-compose.yml",
    "chars": 362,
    "preview": "version: '3.9'\n# we'll keep the version for now to work in Compose and Swarm\n\nservices:\n  db:\n    image: postgres:10.0-a"
  },
  {
    "path": "k8s-manifests/api.yaml",
    "chars": 562,
    "preview": "apiVersion: v1\nkind: Service\nmetadata:\n  name: api\n  labels:\n    app: api\nspec:\n  ports:\n    - port: 8080\n      targetPo"
  },
  {
    "path": "k8s-manifests/db.yaml",
    "chars": 728,
    "preview": "apiVersion: v1\nkind: Service\nmetadata:\n  name: db\n  labels:\n    app: db\nspec:\n  ports:\n    - port: 5432\n      targetPort"
  },
  {
    "path": "k8s-manifests/web.yaml",
    "chars": 548,
    "preview": "apiVersion: v1\nkind: Service\nmetadata:\n  name: web\n  labels:\n    app: web\nspec:\n  ports:\n    - port: 8080\n      targetPo"
  },
  {
    "path": "kustomization.yaml",
    "chars": 212,
    "preview": "resources:\n  - k8s-manifests/api.yaml\n  - k8s-manifests/db.yaml\n  - k8s-manifests/web.yaml\nconfigMapGenerator:\n  - name:"
  },
  {
    "path": "web/Dockerfile",
    "chars": 515,
    "preview": "# BUILD\n# use the build platforms matching arch rather than target arch\nFROM --platform=$BUILDPLATFORM golang:alpine as "
  },
  {
    "path": "web/dispatcher.go",
    "chars": 1368,
    "preview": "package main\n\nimport (\n\t\"fmt\"\n\t\"io/ioutil\"\n\t\"log\"\n\t\"math/rand\"\n\t\"net\"\n\t\"net/http\"\n\t\"time\"\n)\n\nfunc main() {\n\trand.Seed(ti"
  },
  {
    "path": "web/static/app.js",
    "chars": 1183,
    "preview": "\"use strict\";\n\nvar lab = angular.module('lab', []);\n\nlab.controller('LabCtrl', function ($scope, $http, $timeout) {\n  $s"
  },
  {
    "path": "web/static/index.html",
    "chars": 1415,
    "preview": "<!DOCTYPE html>\n<html lang=\"en\" ng-app=\"lab\">\n<head>\n  <meta charset=\"utf-8\">\n  <title>dockercon EU 18</title>\n  <link r"
  },
  {
    "path": "web/static/style.css",
    "chars": 1912,
    "preview": "/* latin-ext */\n@font-face {\n  font-family: 'Raleway';\n  font-style: normal;\n  font-weight: 400;\n  src: local('Raleway')"
  }
]

About this extraction

This page contains the full source code of the dockersamples/k8s-wordsmith-demo GitHub repository, extracted and formatted as plain text for AI agents and large language models (LLMs). The extraction includes 20 files (34.2 KB), approximately 9.0k tokens, and a symbol index with 13 extracted functions, classes, methods, constants, and types. Use this with OpenClaw, Claude, ChatGPT, Cursor, Windsurf, or any other AI tool that accepts text input. You can copy the full output to your clipboard or download it as a .txt file.

Extracted by GitExtract — free GitHub repo to text converter for AI. Built by Nikandr Surkov.

Copied to clipboard!