PHP混合Go协程并发

想法很简单。通过设置 runtime.GOMAXPROCS(1) 让 golang 的进程变成单线程执行的。类似python用gevent的效果。然后通过调度多个协程实现异步I/O并发。php作为一个子函数跑在go的进程内，php需要yield到其他协程时，通过回调到golang函数来实现。从php里调用go提供的子函数时，go保证保存php的当前上下文。当协程执行权让渡回来的时候，把原来的php上下文恢复。关键的代码在：

 // 保存当前协程上的php上下文    
    oldServerCtx := engine.ServerContextGet() 
    fmt.Println(oldServerCtx) 
    defer engine.ServerContextSet(oldServerCtx) 
    oldExecutorCtx := engine.ExecutorContextGet() 
    fmt.Println(oldExecutorCtx) 
    defer engine.ExecutorContextSet(oldExecutorCtx) 
    oldCoreCtx := engine.CoreContextGet() 
    fmt.Println(oldCoreCtx) 
    defer engine.CoreContextSet(oldCoreCtx) 
 
// 放弃全局的锁，使得其他的协程可以开始执行php 
    engineLock.Unlock() 
    defer engineLock.Lock()

ServerContextGet 这几个函数是我加的，获得的是php的(EG/SG/PG)这三个全局context(参见：http://www.cnblogs.com/chance...)。修改过的github.com/deuill/go-php的源代码在：https://github.com/taowen/go-...

完整的php/go混合协程的demo：

package main 
 
import ( 
    "fmt" 
    "github.com/deuill/go-php/engine" 
    "os" 
    "runtime" 
    "time" 
    "sync" 
) 
 
type TestObj struct{} 
 
func newTestObj(args []interface{}) interface{} { 
    return &TestObj{} 
} 
var engineLock *sync.Mutex 
 
func (self *TestObj) Hello() { 
    oldServerCtx := engine.ServerContextGet() 
    fmt.Println(oldServerCtx) 
    defer engine.ServerContextSet(oldServerCtx) 
    oldExecutorCtx := engine.ExecutorContextGet() 
    fmt.Println(oldExecutorCtx) 
    defer engine.ExecutorContextSet(oldExecutorCtx) 
    oldCoreCtx := engine.CoreContextGet() 
    fmt.Println(oldCoreCtx) 
    defer engine.CoreContextSet(oldCoreCtx) 
    engineLock.Unlock() 
    defer engineLock.Lock() 
    time.Sleep(time.Second) 
    fmt.Println("sleep done") 
} 
 
func main() { 
    runtime.GOMAXPROCS(1) 
    theEngine, err := engine.New() 
    engineLock = &sync.Mutex{} 
    if err != nil { 
        fmt.Println(err) 
    } 
    _, err = theEngine.Define("TestObj", newTestObj) 
    wg := &sync.WaitGroup{} 
    wg.Add(2) 
    before := time.Now() 
    fmt.Println("1") 
    go func() { 
        engineLock.Lock() 
        defer engineLock.Unlock() 
        context1, err := theEngine.NewContext() 
        if err != nil { 
            fmt.Println(err) 
        } 
        context1.Output = os.Stdout 
        if err != nil { 
            fmt.Println(err) 
        } 
        fmt.Println("1 enter") 
        _, err = context1.Eval("$testObj = new TestObj(); $testObj->Hello();") 
        fmt.Println("1 back") 
        if err != nil { 
            fmt.Println(err) 
        } 
        //theEngine.DestroyContext(context1) 
        fmt.Println("1 done") 
        wg.Done() 
    }() 
    fmt.Println("2") 
    go func() { 
        engineLock.Lock() 
        defer engineLock.Unlock() 
        context2, err := theEngine.NewContext() 
        if err != nil { 
            fmt.Println(err) 
        } 
        if err != nil { 
            fmt.Println(err) 
        } 
        context2.Output = os.Stdout 
        fmt.Println("2 enter") 
        _, err = context2.Eval("$testObj = new TestObj(); $testObj->Hello();") 
        fmt.Println("2 back") 
        if err != nil { 
            fmt.Println(err) 
        } 
        //theEngine.DestroyContext(context2) 
        fmt.Println("2 done") 
        wg.Done() 
    }() 
    wg.Wait() 
    after := time.Now() 
    fmt.Println(after.Sub(before)) 
}

执行结果是

1 
2 
2 enter 
{0x2cf2930 { 0  0 0 0 [0 0 0 0 0]  0 0  1000 [0 0 0 0]} {{ 0 16 0x7f682e819780 0 [0 0 0 0 0 0 0] } 0 1 [0 0 0] } 0 0 0 [0 0 0 0 0 0] {0 0 0 0 0 0 0 0 0 0 0 {0 0} {0 0} {0 0} [0 0 0]} 0x2a00270 0x2a00f60  8388608 0 1 [0 0 0] 0 {8 7 2 [0 0 0 0] 0 0x29f4520 0x29f4520 0x29f4470 0x29f4420  1 0 0 [0 0 0 0 0]}  {0 [0 0 0 0 0 0 0] } 0 [0 0 0 0 0 0 0]} 
{0x7ffd30bac588 {[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] 2 0 0 [0 0]} 0x7f682f01b928 {[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] 1 0 0 [0 0]} 0x7f682f01b948 [] 0x7f682f01ba60 0x7f682f01b960 0x7f682f167168 0x7f682f01ba88 {64 63 5 [0 0 0 0] 0 0x7f682f1972d8 0x7f682f1972d8 0x7f682f1993f8 0x7f682f1970c8 0x7f682e862d10 0 0 1 [0 0 0 0 0]} {8 0 0 [0 0 0 0] 0  0x7f682f016a00  0 0 1 [0 0 0 0 0]} 0x7ffd30bac590 22527 0 0 [0 0 0 0] 0x7f682f197640 0x29f4f80 0x29f4fd0 0x29f5070  0x2cf2950 0x7f682f1989c0 14 0 1 [0 0 0]  0 1 [0 0 0 0 0 0] {8 0 0 [0 0 0 0] 1  0x7f682f016a00 0x7f682e883140 0 0 1 [0 0 0 0 0]} {8 0 0 [0 0 0 0] 0  0x7f682f016a00 0x7f682e8831d0 1 0 0 [0 0 0 0 0]} 0x7f682f167088 0 [0 0 0 0]  {0 0 } {0 0  0 [0 0 0 0 0 0 0]} {0 0  0 [0 0 0 0 0 0 0]} 0 [0 0 0 0]  0 0 0x29fb2e0  {0x7f682f187030 2 1024 -1 [0 0 0 0]}  [{0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8} {0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8} {0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8}] 0x7f682f167168  {0 [0 0 0 0]  0 [0 0 0 0] 0 0 [0 0 0 0]  0 [0 0 0 0] } 1 [0 0 0 0 0 0 0]  0x7f682f01bde8 895 [0 0 0 0 0 0] []} 
{1 [0 0 0 0 0 0 0] 0 0 0 [0 0 0 0 0 0]  0x29ff9a0 17 134217728 -1 0 0 0 1 [0 0 0 0] 1024 0 0 1 [0 0 0 0 0] 0x2a00870  0x2a010a0 0x7f682ecc58b0  0x7f682ecc5c23  2097152  0x2a00180 0x2a00230  {0x7f682ec91aa8 0x7f682ec91aa8} 0x2a00910 {0 0 0 [0 0 0 0] 0  0 0 0 [0 0 0 0 0]} 0 0 0 [0 0 0] {0x2b6dc10 0x2b6dc10 1 8  1 [0 0 0 0 0 0 0] } [0x7f682f197330 0x7f682f197040 0x7f682f197410  0x7f682f1974f0] 0 1 1 [0 0 0 0 0] 0x7f682ec9544b 0x7f682ec9544b 0 0 [0 0 0 0 0 0] 0 [0 0 0 0 0 0 0 0] 1 1 1 1 1 0 1 [0] 0 [0 0 0 0]  0 [0 0 0 0] 0x2cf27c0  0 0 [0 0 0 0 0 0] 64 1000 0 [0 0 0 0 0 0 0] 0x7f682ecc6270 300 0x2a009b0 1 [0 0 0 0 0 0 0]  0 [0 0 0 0 0 0 0]} 
1 enter 
{0x7f6818000aa0 { 0  0 0 0 [0 0 0 0 0]  0 0  1000 [0 0 0 0]} {{ 0 16 0x7f682e819780 0 [0 0 0 0 0 0 0] } 0 1 [0 0 0] } 0 0 0 [0 0 0 0 0 0] {0 0 0 0 0 0 0 0 0 0 0 {0 0} {0 0} {0 0} [0 0 0]} 0x2a00270 0x2a00f60  8388608 0 1 [0 0 0] 0 {8 7 2 [0 0 0 0] 0 0x29f4520 0x29f4520 0x29f4470 0x29f4420  1 0 0 [0 0 0 0 0]}  {0 [0 0 0 0 0 0 0] } 0 [0 0 0 0 0 0 0]} 
{0x7f682a4cccd8 {[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] 2 0 0 [0 0]} 0x7f682f01b928 {[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] 1 0 0 [0 0]} 0x7f682f01b948 [] 0x7f682f01ba60 0x7f682f01b960 0x7f682802f110 0x7f682f01ba88 {64 63 5 [0 0 0 0] 0 0x7f682f197a00 0x7f682f197a00 0x7f682f198368 0x7f682f198fa0 0x7f682e862d10 0 0 1 [0 0 0 0 0]} {8 0 0 [0 0 0 0] 0  0x7f682f016a00  0 0 1 [0 0 0 0 0]} 0x7f682a4ccce0 22527 0 0 [0 0 0 0] 0x7f682f197d28 0x29f4f80 0x29f4fd0 0x29f5070  0x2cf2950 0x7f682f1983e8 14 0 1 [0 0 0]  0 1 [0 0 0 0 0 0] {8 0 0 [0 0 0 0] 1  0x7f682f016a00 0x7f682e883140 0 0 1 [0 0 0 0 0]} {8 0 0 [0 0 0 0] 0  0x7f682f016a00 0x7f682e8831d0 1 0 0 [0 0 0 0 0]} 0x7f682802f030 0 [0 0 0 0]  {0 0 } {0 0  0 [0 0 0 0 0 0 0]} {0 0  0 [0 0 0 0 0 0 0]} 0 [0 0 0 0]  0 0 0x29fb2e0  {0x7f682804efd8 2 1024 -1 [0 0 0 0]}  [{0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8} {0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8} {0x7f682e915050 [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] [0 0 0 0 0 0 0 0] 0 0 149 8 8 8}] 0x7f682802f110  {0 [0 0 0 0]  0 [0 0 0 0] 0 0 [0 0 0 0]  0 [0 0 0 0] } 1 [0 0 0 0 0 0 0]  0x7f682f01bde8 895 [0 0 0 0 0 0] []} 
{1 [0 0 0 0 0 0 0] 0 0 0 [0 0 0 0 0 0]  0x29ff9a0 17 134217728 -1 0 0 0 1 [0 0 0 0] 1024 0 0 1 [0 0 0 0 0] 0x2a00870  0x2a010a0 0x7f682ecc58b0  0x7f682ecc5c23  2097152  0x2a00180 0x2a00230  {0x7f682ec91aa8 0x7f682ec91aa8} 0x2a00910 {0 0 0 [0 0 0 0] 0  0 0 0 [0 0 0 0 0]} 0 0 0 [0 0 0] {0x2b6dc10 0x2b6dc10 1 8  1 [0 0 0 0 0 0 0] } [0x7f682f197a58 0x7f682f198ce0 0x7f682f197b38  0x7f682f197c18] 0 1 1 [0 0 0 0 0] 0x7f682ec9544b 0x7f682ec9544b 0 0 [0 0 0 0 0 0] 0 [0 0 0 0 0 0 0 0] 1 1 1 1 1 0 1 [0] 0 [0 0 0 0]  0 [0 0 0 0] 0x2cf27c0  0 0 [0 0 0 0 0 0] 64 1000 0 [0 0 0 0 0 0 0] 0x7f682ecc6270 300 0x2a009b0 1 [0 0 0 0 0 0 0]  0 [0 0 0 0 0 0 0]} 
sleep done 
1 back 
1 done 
sleep done 
2 back 
2 done 
1.00099211s

可以看到两个sleep 1s，最终只用了1.00099211s。说明协程是并发的。

一些性能指标。走http调用后端，在i7-6700k上，用ab -n 100 -c 4 可以跑出这样的结果

Requests per second:    3183.70 [#/sec] (mean) 
Time per request:       1.256 [ms] (mean) 
Time per request:       0.314 [ms] (mean, across all concurrent requests)

如果不用http调用后端，直接php=>go返回"hello"，则可以达到

Requests per second: 10073.54 [#/sec] (mean) 
 
Time per request: 0.397 [ms] (mean) 
 
Time per request: 0.099 [ms] (mean, across all concurrent requests)

这些指标只说明了协程切换的成本。实际的收益取决于后端的http服务的延迟，如果耗时很长，通过协程并发则可以收益明显。

这个实验说明了可以用golang实现一个代替nginx+php-fpm的应用服务器。并且提供了一条从php向golang迁移的平滑迁移路径。在一个应用里混合PHP和Go两种语言。

并且可以通过提供golang函数给php调用的方式实现I/O的异步化。像libcurl这样的扩展自身是支持异步回调的，只是php是同步的所以只给php暴露了同步的execute。有了Golang之后，可以把execute变成对异步execute+callback的包装，从而实现基于协程的调度。