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threadregular.go
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171 lines (137 loc) · 3.87 KB
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package frankenphp
import (
"context"
"runtime"
"sync"
"sync/atomic"
"github.com/dunglas/frankenphp/internal/state"
)
// representation of a non-worker PHP thread
// executes PHP scripts in a web context
// implements the threadHandler interface
type regularThread struct {
contextHolder
state *state.ThreadState
thread *phpThread
}
var (
regularThreads []*phpThread
regularThreadMu = &sync.RWMutex{}
regularRequestChan chan contextHolder
queuedRegularThreads = atomic.Int32{}
)
func convertToRegularThread(thread *phpThread) {
thread.setHandler(®ularThread{
thread: thread,
state: thread.state,
})
attachRegularThread(thread)
}
// beforeScriptExecution returns the name of the script or an empty string on shutdown
func (handler *regularThread) beforeScriptExecution() string {
switch handler.state.Get() {
case state.TransitionRequested:
detachRegularThread(handler.thread)
return handler.thread.transitionToNewHandler()
case state.TransitionComplete:
handler.thread.updateContext(false)
handler.state.Set(state.Ready)
return handler.waitForRequest()
case state.Ready:
return handler.waitForRequest()
case state.ShuttingDown:
detachRegularThread(handler.thread)
// signal to stop
return ""
}
panic("unexpected state: " + handler.state.Name())
}
func (handler *regularThread) afterScriptExecution(_ int) {
handler.afterRequest()
}
func (handler *regularThread) frankenPHPContext() *frankenPHPContext {
return handler.contextHolder.frankenPHPContext
}
func (handler *regularThread) context() context.Context {
return handler.ctx
}
func (handler *regularThread) name() string {
return "Regular PHP Thread"
}
func (handler *regularThread) waitForRequest() string {
handler.state.MarkAsWaiting(true)
var ch contextHolder
select {
case <-handler.thread.drainChan:
// go back to beforeScriptExecution
return handler.beforeScriptExecution()
case ch = <-regularRequestChan:
case ch = <-handler.thread.requestChan:
}
handler.ctx = ch.ctx
handler.contextHolder.frankenPHPContext = ch.frankenPHPContext
handler.state.MarkAsWaiting(false)
// set the scriptFilename that should be executed
return handler.contextHolder.frankenPHPContext.scriptFilename
}
func (handler *regularThread) afterRequest() {
handler.contextHolder.frankenPHPContext.closeContext()
handler.contextHolder.frankenPHPContext = nil
handler.ctx = nil
}
func handleRequestWithRegularPHPThreads(ch contextHolder) error {
metrics.StartRequest()
runtime.Gosched()
if queuedRegularThreads.Load() == 0 {
regularThreadMu.RLock()
for _, thread := range regularThreads {
select {
case thread.requestChan <- ch:
regularThreadMu.RUnlock()
<-ch.frankenPHPContext.done
metrics.StopRequest()
return nil
default:
// thread was not available
}
}
regularThreadMu.RUnlock()
}
// if no thread was available, mark the request as queued and fan it out to all threads
queuedRegularThreads.Add(1)
metrics.QueuedRequest()
for {
select {
case regularRequestChan <- ch:
queuedRegularThreads.Add(-1)
metrics.DequeuedRequest()
<-ch.frankenPHPContext.done
metrics.StopRequest()
return nil
case scaleChan <- ch.frankenPHPContext:
// the request has triggered scaling, continue to wait for a thread
case <-timeoutChan(maxWaitTime):
// the request has timed out stalling
queuedRegularThreads.Add(-1)
metrics.DequeuedRequest()
metrics.StopRequest()
ch.frankenPHPContext.reject(ErrMaxWaitTimeExceeded)
return ErrMaxWaitTimeExceeded
}
}
}
func attachRegularThread(thread *phpThread) {
regularThreadMu.Lock()
regularThreads = append(regularThreads, thread)
regularThreadMu.Unlock()
}
func detachRegularThread(thread *phpThread) {
regularThreadMu.Lock()
for i, t := range regularThreads {
if t == thread {
regularThreads = append(regularThreads[:i], regularThreads[i+1:]...)
break
}
}
regularThreadMu.Unlock()
}