Let's talk about how golang calls php7

This article is introduced by the go language tutorial column to introduce how golang calls php7. I hope it will be helpful to friends in need!

golang calls php7

Use https://github.com/taowen/go-php7
Based on https: //github.com/deuill/go-php modified, reason for fork (https://github.com/deuill/go-php/issues/32)

Execute php file

func Test_exec(t *testing.T) {
    engine.Initialize()
    ctx := &engine.Context{
        Output: os.Stdout,
    }
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    err = ctx.Exec("/tmp/index.php")
    if err != nil {
        fmt.Println(err)
    }
}

The content of /tmp/index.php is

<?php
echo("hello\n");

Eval, and the return value

func Test_eval(t *testing.T) {
    engine.Initialize()
    ctx := &engine.Context{}
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    val, err := ctx.Eval("return 'hello';")
    if err != nil {
        fmt.Println(err)
    }
    defer engine.DestroyValue(val)
    if engine.ToString(val) != "hello" {
        t.FailNow()
    }
}

The life cycle ownership of the returned value is the golang program, so we need Responsible for DestroyValue

Set global variables to pass parameters

func Test_argument(t *testing.T) {
    engine.Initialize()
    ctx := &engine.Context{}
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    err = ctx.Bind("greeting", "hello")
    if err != nil {
        fmt.Println(err)
    }
    val, err := ctx.Eval("return $greeting;")
    if err != nil {
        fmt.Println(err)
    }
    defer engine.DestroyValue(val)
    if engine.ToString(val) != "hello" {
        t.FailNow()
    }
}

The life cycle of the parameters passed in is controlled by PHP, and the memory will be released when the request is shut down.

PHP callback Golang

type greetingProvider struct {
    greeting string
}

func (provider *greetingProvider) GetGreeting() string {
    return provider.greeting
}

func newGreetingProvider(args []interface{}) interface{} {
    return &greetingProvider{
        greeting: args[0].(string),
    }
}

func Test_callback(t *testing.T) {
    engine.Initialize()
    ctx := &engine.Context{}
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    err = engine.Define("GreetingProvider", newGreetingProvider)
    if err != nil {
        fmt.Println(err)
    }
    val, err := ctx.Eval(`
    $greetingProvider = new GreetingProvider('hello');
    return $greetingProvider->GetGreeting();`)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.DestroyValue(val)
    if engine.ToString(val) != "hello" {
        t.FailNow()
    }
}

PHP error log

func Test_log(t *testing.T) {
    engine.PHP_INI_PATH_OVERRIDE = "/tmp/php.ini"
    engine.Initialize()
    ctx := &engine.Context{
        Log: os.Stderr,
    }
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    _, err = ctx.Eval("error_log('hello', 4); trigger_error('sent from golang', E_USER_ERROR);")
    if err != nil {
        fmt.Println(err)
    }
}

The content of /tmp/php.ini is

error_reporting = E_ALL
error_log = "/tmp/php-error.log"

error Will be output to /tmp/php-error.log. Directly calling error_log will simultaneously output another copy to stderr

HTTP input and output

func Test_http(t *testing.T) {
    engine.Initialize()
    recorder := httptest.NewRecorder()
    ctx := &engine.Context{
        Request: httptest.NewRequest("GET", "/hello", nil),
        ResponseWriter: recorder,
    }
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    _, err = ctx.Eval("echo($_SERVER['REQUEST_URI']);")
    if err != nil {
        fmt.Println(err)
    }
    body, err := ioutil.ReadAll(recorder.Result().Body)
    if err != nil {
        fmt.Println(err)
    }
    if string(body) != "/hello" {
        t.FailNow()
    }
}

All PHP super global variables will be initialized to the value of the passed Request, including

$_SERVER
$_GET
$_POST
$_FILE
$_COOKIE
$_ENV

echo content, http code and http header will be written back to the incoming ResponseWriter

fastcgi_finish_request

PHP-FPM A very commonly used function is fastcgi_finish_request, Used to do some asynchronous things in php. This special global function must support

func Test_fastcgi_finish_reqeust(t *testing.T) {
    engine.Initialize()
    buffer := &bytes.Buffer{}
    ctx := &engine.Context{
        Output: buffer,
    }
    err := engine.RequestStartup(ctx)
    if err != nil {
        fmt.Println(err)
    }
    defer engine.RequestShutdown(ctx)
    ctx.Eval("ob_start(); echo ('hello');")
    if buffer.String() != "" {
        t.FailNow()
    }
    ctx.Eval("fastcgi_finish_request();")
    if buffer.String() != "hello" {
        t.FailNow()
    }
}

The actual function is to output the output to ResposneWriter in advance to let the caller know the result. It actually has no impact on the execution of the current process, but only affects the output.

Recommended study: "golang tutorial"

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