Full Code of theganyo/lua2go for AI

Repository: theganyo/lua2go
Branch: master
Commit: 87b93bd42162
Files: 17
Total size: 30.0 KB

Directory structure:
gitextract_2_6e1xxv/

├── .gitignore
├── LICENSE
├── README.md
├── benchmark/
│   ├── README.md
│   ├── conf/
│   │   └── nginx.conf
│   ├── file
│   ├── go/
│   │   ├── benchmark.go
│   │   └── benchmark.h
│   ├── lua/
│   │   └── benchmark.lua
│   └── node/
│       ├── app.js
│       ├── config/
│       │   └── default.yaml
│       └── package.json
├── example/
│   ├── example.go
│   ├── example.h
│   └── example.lua
├── lua/
│   └── lua2go.lua
└── lua2go-scm-1.rockspec

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

================================================
FILE: .gitignore
================================================
*.lock
*.log.*
*_temp

### Lua template
# Compiled Lua sources
luac.out

# luarocks build files
*.src.rock
*.zip
*.tar.gz

# Object files
*.o
*.os
*.ko
*.obj
*.elf

# Precompiled Headers
*.gch
*.pch

# Libraries
*.lib
*.a
*.la
*.lo
*.def
*.exp

# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib

# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex

### Node template
# Logs
logs
*.log
npm-debug.log*

# Runtime data
pids
*.pid
*.seed

# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov

# Coverage directory used by tools like istanbul
coverage

# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt

# node-waf configuration
.lock-wscript

# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release

# Dependency directory
# https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
node_modules
### Go template
# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so

# Folders
_obj
_test

# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out

*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*

_testmain.go

*.exe
*.test
*.prof

# Created by .ignore support plugin (hsz.mobi)


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

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================================================
FILE: README.md
================================================
Accessing Go via Lua
====================

This module enables easy access to Go modules from LuaJit and therefore, NGINX with the LuaJit module. So if you need the capabilities of Go in your NGINX processing, you've come to the right place!

Note: Lua2Go is now available from LuaRocks: http://luarocks.org/modules/scottganyo/lua2go

To use (see also the [example](./example):

1. Write your Go module and `export` your functions:

    ```
    //export add
    func add(operand1 int, operand2 int) int {
        return operand1 + operand2
    }
    ```

2. Build your go module as a shared library:

    `go build -buildmode=c-shared -o example.so example.go`

3. Include a bit of setup in your Lua file:

    ```
    local lua2go = require('lua2go')
    local example = lua2go.Load('./example.so')
    ```

4. Register your `extern` declarations from your header file (`example.h`) in your Lua:

    ```
    lua2go.Externs[[
      extern GoInt add(GoInt p0, GoInt p1);
    ]]
    ```

5. Call your Go function from Lua (see [example](./example) for more detail):

    ```
    local result = lua2go.ToGo(example.add(1, 1))
    ```

6. Run your app:

    `luajit myapp.lua`

7. Bask in the glory of all that you've accomplished!

8. To see how Lua2Go can be incorporated into NGINX, check out the [benchmark](./benchmark) example.

Enjoy!


================================================
FILE: benchmark/README.md
================================================
Benchmarking Go via LuaJit in nginx
===================================

1. build the benchmark library

    ```
    cd go
    go build -buildmode=c-shared -o benchmark.so benchmark.go
    cd ..
    ```

2. install openresty (or nginx w/ LuaJit library)

3. add localhost aliases: 'local', 'proxy', and 'target' to your /etc/hosts

4. execute: `openresty -p $PWD -c conf/nginx.conf`

5. start node proxy (optional)

    ```
    cd node
    npm install
    node app.js
    ```

6. You will now have the following endpoints to hit for various benchmarks:

    `http://localhost:3000/echo` : nginx echo

    `http://localhost:3000/file` : nginx serve small static file

    `http://localhost:3000/lua2go` : nginx -> lua2go -> benchmark.go, echo result

    In addition, the following endpoints will proxy nginx -> nginx:

    `http://localhost:3001/echo` : nginx proxy_pass -> target nginx echo

    `http://localhost:3001/file` : nginx proxy_pass -> target nginx serve small static file

    `http://localhost:3001/lua2go` : nginx -> lua2go -> benchmark.go -> rewrite -> /echo

    And, if you ran the node proxy, the following endpoints will proxy node -> nginx:

    `http://localhost:3003/echo` : node -> nginx echo

    `http://localhost:3003/file` : nginx serve small static file

7. Run your own benchmarks! I don't have a script. :)

    You can install weighttp and try something like this:

    `weighttp -n 1000 -c 128 -t 128 -k -H "User-Agent: Me" localhost:3000/lua2go`


================================================
FILE: benchmark/conf/nginx.conf
================================================
worker_processes  4;

error_log /dev/stderr;
error_log error.log;

events {
  worker_connections 1024;
}

http {

#  lua_code_cache off;
  lua_package_path "../lua/?.lua;;;";

  upstream target {
    server localhost:3002;
  }

  init_by_lua_block {
    ffi = require('ffi')
    lua2go = require('lua2go')

    -- copied from benchmark.h
    ffi.cdef[[
      extern GoString process(GoString method, GoString headers, GoString body);
    ]]
   }

  root ./;

  # responds from the local (initial) nginx
  server {
    server_name localhost;
    listen 3000;

    # for static page call /file
    location / {
    }

    location /echo {
      echo local_;
    }

    location /lua2go {
      content_by_lua_block {
        local benchmark = require('lua/benchmark')
        local result = benchmark.run()
        ngx.say(result)
      }
    }
  }

  # responds by proxying to the "target" nginx
  server {
    server_name localhost;
    listen 3001;

    location / {
      proxy_pass http://target;
    }

    location /echo {
      proxy_pass http://target/echo;
    }

    location /lua2go {
      rewrite_by_lua_block {
        local benchmark = require('lua/benchmark')
        local result = benchmark.run()
        -- result = ngx.location.capture('/echo')
        -- ngx.say(result.body)
        ngx.req.set_uri('/echo', true)
      }
    }
  }

  # the "target" nginx is an echo server
  server {
    server_name localhost;
    listen 3002;

    # for static page call /file
    location / {
    }

    location /echo {
      echo target;
    }
  }
}


================================================
FILE: benchmark/file
================================================
afile


================================================
FILE: benchmark/go/benchmark.go
================================================
package main

import "C"
import "strconv"

var counter = 0

//export process
func process(method string, headers string, body string) string {
  counter = counter + 1
	return "lua2go" + strconv.Itoa(counter)
}

func main() {}


================================================
FILE: benchmark/go/benchmark.h
================================================
/* Created by "go tool cgo" - DO NOT EDIT. */

/* package command-line-arguments */

/* Start of preamble from import "C" comments.  */




/* End of preamble from import "C" comments.  */


/* Start of boilerplate cgo prologue.  */

#ifndef GO_CGO_PROLOGUE_H
#define GO_CGO_PROLOGUE_H

typedef signed char GoInt8;
typedef unsigned char GoUint8;
typedef short GoInt16;
typedef unsigned short GoUint16;
typedef int GoInt32;
typedef unsigned int GoUint32;
typedef long long GoInt64;
typedef unsigned long long GoUint64;
typedef GoInt64 GoInt;
typedef GoUint64 GoUint;
typedef __SIZE_TYPE__ GoUintptr;
typedef float GoFloat32;
typedef double GoFloat64;
typedef __complex float GoComplex64;
typedef __complex double GoComplex128;

// static assertion to make sure the file is being used on architecture
// at least with matching size of GoInt.
typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];

typedef struct { char *p; GoInt n; } GoString;
typedef void *GoMap;
typedef void *GoChan;
typedef struct { void *t; void *v; } GoInterface;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;

#endif

/* End of boilerplate cgo prologue.  */

#ifdef __cplusplus
extern "C" {
#endif


extern GoString process(GoString p0, GoString p1, GoString p2);

#ifdef __cplusplus
}
#endif


================================================
FILE: benchmark/lua/benchmark.lua
================================================
-- called from nginx.conf

local benchmark = {}

function benchmark.run()

  -- note: apigee externs are defined in nginx.confg
  local benchmark = lua2go.Load('./go/benchmark.so')

  local method = ngx.req.get_method()

  local no_request_line = true
  local rawHeaders = ngx.req.raw_header(no_request_line)

  local body = ngx.req.get_body_data() or '' -- cannot be nil

  local goResult = benchmark.process(lua2go.ToGo(method), lua2go.ToGo(rawHeaders), lua2go.ToGo(body))

  return lua2go.ToLua(goResult)
end

return benchmark


================================================
FILE: benchmark/node/app.js
================================================
'use strict'

const connect = require('connect')
const http = require('http')
const debug = require('debug')('test')
const microgateway = require('microgateway-core')
const config = require('config')

const gateway = microgateway(config)

debug('starting gateway')

gateway.start((err, server) => {
  if (err) {
    debug('gateway err %o', err)
    process.exit(1)
  }

  debug('gateway started')
})


================================================
FILE: benchmark/node/config/default.yaml
================================================
edgemicro:
  port: 3003
  logging:
    level: warn
proxies:
- base_path: /
  url: http://localhost:3002


================================================
FILE: benchmark/node/package.json
================================================
{
  "name": "microproxy",
  "private": true,
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "author": "Scott Ganyo",
  "license": "MIT",
  "dependencies": {
    "config": "^1.19.0",
    "connect": "^3.3.5",
    "debug": "^2.2.0",
    "js-yaml": "^3.5.5",
    "microgateway-core": "git@github.com:apigee/microgateway-core.git"
  },
  "scripts": {
    "start": "node app.js"
  }
}


================================================
FILE: example/example.go
================================================
package main

import (
	"C"
  	"strings"
)


//export add
func add(operand1 int, operand2 int) int {
	return operand1 + operand2
}

//export concat
func concat(elements []string, separator string) *C.char {
	// This CString must be released by caller!
	return C.CString(strings.Join(elements, separator))
}

//export increment
func increment(value *int) {
	*value = *value + 1
}

//export reverse
func reverse(value []int) {
	for i, j := 0, len(value) - 1; i < j; i, j = i + 1, j - 1 {
		value[i], value[j] = value[j], value[i]
	}
}

func main() {}


================================================
FILE: example/example.h
================================================
/* Created by "go tool cgo" - DO NOT EDIT. */

/* package command-line-arguments */

/* Start of preamble from import "C" comments.  */




/* End of preamble from import "C" comments.  */


/* Start of boilerplate cgo prologue.  */

#ifndef GO_CGO_PROLOGUE_H
#define GO_CGO_PROLOGUE_H

typedef signed char GoInt8;
typedef unsigned char GoUint8;
typedef short GoInt16;
typedef unsigned short GoUint16;
typedef int GoInt32;
typedef unsigned int GoUint32;
typedef long long GoInt64;
typedef unsigned long long GoUint64;
typedef GoInt64 GoInt;
typedef GoUint64 GoUint;
typedef __SIZE_TYPE__ GoUintptr;
typedef float GoFloat32;
typedef double GoFloat64;
typedef float _Complex GoComplex64;
typedef double _Complex GoComplex128;

/*
  static assertion to make sure the file is being used on architecture
  at least with matching size of GoInt.
*/
typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];

typedef struct { const char *p; GoInt n; } GoString;
typedef void *GoMap;
typedef void *GoChan;
typedef struct { void *t; void *v; } GoInterface;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;

#endif

/* End of boilerplate cgo prologue.  */

#ifdef __cplusplus
extern "C" {
#endif


extern GoInt add(GoInt p0, GoInt p1);

extern char* concat(GoSlice p0, GoString p1);

extern void increment(GoInt* p0);

extern void reverse(GoSlice p0);

#ifdef __cplusplus
}
#endif


================================================
FILE: example/example.lua
================================================
-- ensure the lua2go lib is on the LUA_PATH so it will load
-- normally, you'd just put it on the LUA_PATH
package.path = package.path .. ';../lua/?.lua'

-- load lua2go
local lua2go = require('lua2go')

-- load my Go library
local example = lua2go.Load('./example.so')

-- copy just the extern functions from benchmark.h into ffi.cdef structure below
-- (the boilerplate cgo prologue is already defined for you in lua2go)
-- this registers your Go functions to the ffi library..
lua2go.Externs[[
  extern GoInt add(GoInt p0, GoInt p1);
  extern char* concat(GoSlice p0, GoString p1);
  extern void increment(GoInt* p0);
  extern void reverse(GoSlice p0);
]]

---------------------------------------------------------
-- all set up, now you may call your Go functions!

---------------------------------------------------------
-- Let's do the easiest one first. We'll add two ints and return the result.

-- note that Lua numbers in the parameters are auto-converted to GoInts (yay!)
-- but... the result will still be a GoInt...
local goAddResult = example.add(1, 1)

-- which means we need to convert it - easy with a call to lua2go.ToLua()
-- we use capitalized exported functions, so you Go folks feel right at home!
local addResult = lua2go.ToLua(goAddResult)

print('1 + 1 = ' .. addResult)


---------------------------------------------------------
-- What about passing an int by reference? Also, super easy!

local value = 2

-- create a Go pointer to the value
local intPtr = lua2go.ToGoPointer(value)

-- call increment, passing the pointer
example.increment(intPtr)

-- use [0] to deference the pointer
local newValue = lua2go.ToLua(intPtr[0])

print(value .. ' + 1 = ' .. newValue)


--------------------------------------------------------------------
-- Numbers are easy, but what about passing a Go Slice by reference?
-- We'll reverse a Slice of numbers

-- Note: Go Slice support is rudimentory right now and subject to change

-- we'll reverse these values
local values = { 1, 2, 3 }

-- hold on to both results
-- we'll give Go the slice, but we need the array for iteration
local goSlice, goArray = lua2go.ToGoSlice(values)

-- pass the slice to Go to reverse
example.reverse(goSlice)

-- print the reversed array
-- note: this is a Go Array, so it's zero-indexed
local countDown = ''
for i = 0, #values - 1 do
  countDown = countDown .. ' ...' .. lua2go.ToLua(goArray[i])
end
print("The final countdown" .. countDown)


--------------------------------------------------------------------------
-- Finally, let's concat an table together and return a new string from Go

-- we'll start with a table of strings
local strings = {
  'Lua2Go',
  'is',
  'pretty',
  'cool!'
}

-- then convert the table to a slice of Go strings
local goSliceOfStrings = lua2go.ToGoSlice(strings)

-- make a GoString for the separator
local separator = lua2go.ToGo(' ')

-- call our Go concat function
local result = example.concat(goSliceOfStrings, separator)

-- Important: Go allocated the return value, so we'll need to deallocate it!
-- tell the Lua garbage collector to handle this for us
lua2go.AddToGC(result)

-- convert to Lua
local luaConcatResult = lua2go.ToLua(result)

print(luaConcatResult)


================================================
FILE: lua/lua2go.lua
================================================
--[[

 A library for calling into Go from LuaJit

--]]

local lua2go = {}

local ffi = require('ffi')

ffi.cdef[[
  // standard Go definitions //

  typedef signed char GoInt8;
  typedef unsigned char GoUint8;
  typedef short GoInt16;
  typedef unsigned short GoUint16;
  typedef int GoInt32;
  typedef unsigned int GoUint32;
  typedef long long GoInt64;
  typedef unsigned long long GoUint64;
  typedef GoInt64 GoInt;
  typedef GoUint64 GoUint;
  typedef float GoFloat32;
  typedef double GoFloat64;
  typedef __complex float GoComplex64;
  typedef __complex double GoComplex128;

  // static assertion to make sure the file is being used on architecture
  // at least with matching size of GoInt.
  typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];

  // change to Go struct: add 'const' declaration to char * (required by Lua FFI)
  // typedef struct { char *p; GoInt n; } GoString;
  typedef struct { const char *p; GoInt n; } GoString;

  typedef void *GoMap;
  typedef void *GoChan;
  typedef struct { void *t; void *v; } GoInterface;
  typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;

  // C stdlib definitions //

  void free(void *ptr);
]]

local makeGoString = ffi.typeof('GoString')
local makeGoSlice = ffi.typeof('GoSlice')
local makeGoStringArray = ffi.typeof('GoString[?]')
local makeGoIntArray = ffi.typeof('GoInt[?]')
local identity = function(x) return x end

-- types: "nil", "number", "string", "boolean", "table", "function", "thread", or "userdata"
local goTypes = {
  number = 'GoInt',
  string = 'GoString'
}

local goArrayConstructors = {
  number = makeGoIntArray,
  string = makeGoStringArray
}

local goConverters = {
  number = identity
}
goConverters['nil'] = identity


--
-- public interface
--

-- create cdata object
lua2go.New = ffi.new

-- add cdata to garbage collector, returns GC ref
lua2go.AddToGC = function(cdata)
  return ffi.gc(cdata, ffi.C.free)
end

-- returns the typeof the Go object
lua2go.GoType = ffi.typeof

-- loads and returns a Go library
lua2go.Load = ffi.load

-- defines loaded functions
lua2go.Externs = ffi.cdef

-- convert C String to Lua
lua2go.ToLuaString = function(str)
  if ffi.typeof(str) == makeGoString then
    return ffi.string(str.p)
  else
    return ffi.string(str) -- assume char *
  end
end

-- convert Number to Lua
lua2go.ToLuaNumber = tonumber

-- converts Lua String to a Go String
function lua2go.ToGoString(str)
  if str == nil then return '' end
  return makeGoString({ str, #str })
end
goConverters['string'] = lua2go.ToGoString

-- returns the Go type a luaVar will map to
-- currently supports Go strings and ints
function lua2go.Type(luaVar)
  local luaType = type(luaVar)
  return goTypes[luaType]
end

-- retrieve a function to get the slice type for a lua table
-- note: must be an array-style table, not a map
function lua2go.SliceType(table)
  return lua2go.Type(table[1])..'[?]'
end

-- will make a Go array that is either Ints or Strings based on the first element type
-- must be an array-style table, not a map
-- currently only supports string and ints
function lua2go.ToGoArray(table)
  local luaType = type(table[1])
  local makeGoArray = goArrayConstructors[luaType]
  local goArray = makeGoArray(#table)
  local toGoType = goConverters[luaType]
  for index, value in next, table do
    goArray[index - 1] = toGoType(value)
  end
  return goArray
end
goConverters['table'] = lua2go.ToGoArray


-- will make a Go slice that is either Ints or Strings based on the first element type
-- must be an array-style table, not a map
-- returns GoSlice, backing array
function lua2go.ToGoSlice(table)
  local goArray = lua2go.ToGoArray(table)
  return makeGoSlice({ goArray, #table, #table }), goArray
end

-- retrieve a function to convert the luaVar to a goVar based on the type of luaVar
-- currently supports Go strings and ints
function lua2go.Converter(luaVar)
  return goConverters[type(luaVar)]
end

-- converts a goVar to a luaVar
-- currently supports Go strings and ints
function lua2go.ToLua(goVar)
  if goVar == nil then return nil end
  if ffi.istype('GoString', goVar) or ffi.istype('char *', goVar) then
    return lua2go.ToLuaString(goVar)
  elseif ffi.istype('GoInt', goVar) then
    return lua2go.ToLuaNumber(goVar)
  else
    error('unknown type')
  end
end

-- converts luaVar to goVar using simple type mapping
-- currently only converts strings, numbers are left alone as they are converted automatically
function lua2go.ToGo(luaVar)
  local convert = lua2go.Converter(luaVar)
  return convert(luaVar)
end

-- returns a pointer and a value holder variable
function lua2go.ToGoPointer(luaVar)
  local luaType = type(luaVar)
  local makeGoArray = goArrayConstructors[luaType]
  local ptr = makeGoArray(1, luaVar)
  return ptr, ptr[0]
end

local module_mt = {
  __newindex = (function (table, key, val) error('Attempt to write to undeclared variable "' .. key .. '"') end)
}
setmetatable(lua2go, module_mt)
return lua2go


================================================
FILE: lua2go-scm-1.rockspec
================================================
 package = "Lua2Go"
 version = "scm-1"
 source = {
    url = "git://github.com/theganyo/lua2go"
 }
 description = {
    summary = "Easy access to your Go (Golang) modules from Lua and NGINX",
    detailed = [[
      This module enables easy access to Go modules from LuaJit and therefore,
      NGINX with the LuaJit module. So if you need the capabilities of Go in 
      your NGINX processing, you've come to the right place!
    ]],
    homepage = "https://github.com/theganyo/lua2go",
    license = "Apache-2.0"
 }
 dependencies = {
    "lua ~> 5.1"
 }
 build = {
    type = "builtin",
    modules = {
      lua2go = "lua/lua2go.lua"
    }
 }