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server_unix.go
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server_unix.go
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// Copyright 2019 Andy Pan. All rights reserved.
// Copyright 2018 Joshua J Baker. All rights reserved.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
//go:build linux || darwin || netbsd || freebsd || openbsd || dragonfly
// +build linux darwin netbsd freebsd openbsd dragonfly
package gnet
import (
"flag"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
"os/signal"
"runtime"
"strconv"
"sync"
"syscall"
"time"
"github.com/kolinfluence/gnet/pkg/errors"
"github.com/kolinfluence/gnet/internal/netpoll"
"github.com/luyu6056/tls"
"golang.org/x/sys/unix"
)
type server struct {
ln *listener // all the listeners
wg sync.WaitGroup // loop close WaitGroup
opts *Options // options with server
once sync.Once // make sure only signalShutdown once
cond *sync.Cond // shutdown signaler
codec ICodec // codec for TCP stream
ticktock chan time.Duration // ticker channel
mainLoop *eventloop // main loop for accepting connections
eventHandler EventHandler // user eventHandler
subLoopGroup IEventLoopGroup // loops for handling events
subLoopGroupSize int // number of loops
Isblock bool //允许阻塞
tlsconfig *tls.Config
close chan bool
connections sync.Map // loop connections fd -> conn
connWg *sync.WaitGroup
}
// waitForShutdown waits for a signal to shutdown
func (srv *server) waitForShutdown() {
srv.cond.L.Lock()
srv.cond.Wait()
srv.cond.L.Unlock()
srv.stop()
}
// signalShutdown signals a shutdown an begins server closing
func (srv *server) signalShutdown() {
srv.once.Do(func() {
srv.cond.L.Lock()
srv.cond.Signal()
srv.cond.L.Unlock()
})
}
func (srv *server) startLoops() {
srv.subLoopGroup.iterate(func(i int, lp *eventloop) bool {
srv.wg.Add(1)
go func() {
lp.loopOut()
lp.loopRun()
srv.wg.Done()
}()
return true
})
}
func (srv *server) closeConns() {
srv.connections.Range(func(key, value interface{}) bool {
c := value.(*conn)
c.loopCloseConn(errors.ErrEngineShutdown)
return true
})
srv.connWg.Wait()
}
func (srv *server) closeLoops() {
select {
case srv.close <- true:
default:
}
srv.closeConns()
var wg sync.WaitGroup
srv.subLoopGroup.iterate(func(i int, lp *eventloop) bool {
wg.Add(1)
sniffError(lp.poller.Trigger(func(_ interface{}) error {
return errors.ErrEngineShutdown
}, nil))
lp.outclose <- true
go func() {
<-lp.outclose
wg.Done()
}()
return true
})
wg.Wait()
}
func (srv *server) startReactors() {
srv.subLoopGroup.iterate(func(i int, el *eventloop) bool {
srv.wg.Add(1)
go func() {
el.loopOut()
srv.activateSubReactor(el)
srv.wg.Done()
}()
return true
})
}
func (srv *server) activateLoops(numLoops int) error {
// Create loops locally and bind the listeners.
for i := 0; i < numLoops; i++ {
if p, err := netpoll.OpenPoller(); err == nil {
el := &eventloop{
idx: i,
srv: srv,
codec: srv.codec,
poller: p,
packet: make([]byte, 0xFFFF),
eventHandler: srv.eventHandler,
}
el.pollAttachment = netpoll.GetPollAttachment()
el.pollAttachment.FD = srv.ln.fd
el.pollAttachment.Callback = el.handleEvent
_ = el.poller.AddRead(el.pollAttachment)
srv.subLoopGroup.register(el)
} else {
return err
}
}
srv.subLoopGroupSize = srv.subLoopGroup.len()
// Start loops in background
srv.startLoops()
return nil
}
func (srv *server) activateReactors(numLoops int) error {
if p, err := netpoll.OpenPoller(); err == nil {
el := &eventloop{
idx: -1,
poller: p,
srv: srv,
outclose: make(chan bool, 1),
}
el.pollAttachment = netpoll.GetPollAttachment()
el.pollAttachment.FD = srv.ln.fd
el.pollAttachment.Callback = srv.activateMainReactorCallback
_ = el.poller.AddRead(el.pollAttachment)
srv.mainLoop = el
// Start main reactor.
srv.wg.Add(1)
go func() {
srv.activateMainReactor()
srv.wg.Done()
}()
} else {
return err
}
for i := 0; i < numLoops; i++ {
if p, err := netpoll.OpenPoller(); err == nil {
el := &eventloop{
idx: i,
srv: srv,
codec: srv.codec,
poller: p,
packet: make([]byte, 0xFFFF),
eventHandler: srv.eventHandler,
}
srv.subLoopGroup.register(el)
} else {
return err
}
}
srv.subLoopGroupSize = srv.subLoopGroup.len()
// Start sub reactors.
srv.startReactors()
return nil
}
func (srv *server) activateMainReactorCallback(fd int) error {
return srv.acceptNewConnection(fd)
}
func (srv *server) start(numCPU int) error {
if srv.opts.ReusePort || srv.ln.pconn != nil {
return srv.activateLoops(numCPU)
}
return srv.activateReactors(numCPU)
}
func (srv *server) stop() {
srv.waitClose()
// Close loops and all outstanding connections
srv.closeLoops()
// Wait on all loops to complete reading events
// Notify all loops to close by closing all listeners
if srv.mainLoop != nil {
sniffError(srv.mainLoop.poller.Trigger(func(_ interface{}) error {
return errors.ErrEngineShutdown
}, nil))
}
srv.wg.Wait()
if srv.mainLoop != nil {
sniffError(srv.mainLoop.poller.Close())
srv.mainLoop.outclose <- true
}
}
// tcp平滑重启,开启ReusePort有效,关闭ReusePort则会造成短暂的错误
func serve(eventHandler EventHandler, addr string, options *Options) error {
srv := new(server)
srv.connWg = new(sync.WaitGroup)
var ln listener
//efer ln.close()
ln.network, ln.addr = parseAddr(addr)
if len(ln.network) >= 4 && ln.network[:4] == "unix" {
sniffError(os.RemoveAll(ln.addr))
}
var (
reload, graceful, stop bool
)
if options.Graceful {
flag.BoolVar(&reload, "reload", false, "listen on fd open 3 (internal use only)")
flag.BoolVar(&graceful, "graceful", false, "listen on fd open 3 (internal use only)")
flag.BoolVar(&stop, "stop", false, "stop the server from pid")
}
var err error
if ln.network == "udp" {
ln.pconn, err = net.ListenPacket(ln.network, ln.addr)
} else {
flag.Parse()
if stop {
b, err := ioutil.ReadFile("./" + options.PidName)
if err == nil {
pidstr := string(b)
pid, err := strconv.Atoi(pidstr)
if err == nil {
if err = syscall.Kill(pid, syscall.SIGTERM); err == nil {
log.Println("stop server ok")
return nil
}
}
}
log.Println("stop server fail or server not start")
return nil
}
if reload {
b, err := ioutil.ReadFile("./" + options.PidName)
if err == nil {
pidstr := string(b)
pid, err := strconv.Atoi(pidstr)
if err == nil {
if err = syscall.Kill(pid, syscall.SIGUSR1); err == nil {
log.Println("reload ok")
return nil
} else {
log.Println("server not start")
return nil
}
} else {
log.Println("server not start")
return nil
}
}
}
if graceful {
f := os.NewFile(3, "")
ln.ln, err = net.FileListener(f)
f.Close()
} else {
ln.ln, err = net.Listen(ln.network, ln.addr)
}
if err == nil {
pid := unix.Getpid()
f, err := os.OpenFile("./"+options.PidName, os.O_CREATE|os.O_TRUNC|os.O_RDWR, 0644)
if err != nil {
return err
}
f.WriteString(strconv.Itoa(int(pid)))
f.Close()
if options.Graceful {
go srv.signalHandler()
}
}
}
if err != nil {
return err
}
if ln.pconn != nil {
ln.lnaddr = ln.pconn.LocalAddr()
} else {
ln.lnaddr = ln.ln.Addr()
}
if err := ln.system(); err != nil {
return err
}
// Figure out the correct number of loops/goroutines to use.
numCPU := options.LoopNum
if numCPU <= 0 {
numCPU = runtime.NumCPU()
}
srv.close = make(chan bool, 1)
srv.opts = options
srv.tlsconfig = options.Tlsconfig
srv.eventHandler = eventHandler
srv.ln = &ln
srv.subLoopGroup = new(eventLoopGroup)
srv.cond = sync.NewCond(&sync.Mutex{})
srv.ticktock = make(chan time.Duration, 1)
srv.Isblock = options.Isblock
srv.codec = func() ICodec {
if options.Codec == nil {
return new(BuiltInFrameCodec)
}
return options.Codec
}()
server := Server{
Multicore: numCPU > 1,
Addr: ln.lnaddr,
NumEventLoop: numCPU,
ReUsePort: options.ReusePort,
TCPKeepAlive: options.TCPKeepAlive,
Close: func() {
srv.close <- true
},
}
log.Printf("LLLLLL")
if srv.opts.ReusePort {
log.Printf("LLXXLLLL = %d", srv.ln.fd)
err := unix.SetsockoptInt(int(srv.ln.fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
if err != nil {
return err
}
err = unix.SetsockoptInt(int(srv.ln.fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
if err != nil {
return err
}
}
switch srv.eventHandler.OnInitComplete(server) {
case None:
case Shutdown:
return nil
}
if err := srv.start(numCPU); err != nil {
srv.closeLoops()
log.Printf("gnet server is stoping with error: %v\n", err)
return err
}
srv.waitForShutdown()
return nil
}
func (srv *server) signalHandler() {
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, syscall.SIGUSR1)
select {
case sig := <-ch:
signal.Stop(ch)
var wg, wg1 sync.WaitGroup
wg.Add(srv.subLoopGroup.len())
wg1.Add(1)
srv.subLoopGroup.iterate(func(i int, lp *eventloop) bool {
sniffError(lp.poller.Trigger(func(_ interface{}) error {
wg.Done()
wg1.Wait()
return nil
}, nil))
return true
})
wg.Wait()
srv.ln.fd = 0 // 修改监听fd让accept失效
wg1.Done()
// timeout context for shutdown
switch sig {
case syscall.SIGINT, syscall.SIGTERM:
// stop
log.Println("signal: stop")
srv.signalShutdown()
return
case syscall.SIGUSR1:
if srv.ln != nil {
// reload
f, err := srv.ln.ln.(*net.TCPListener).File()
var args []string
if err == nil {
args = []string{"-graceful"}
}
cmd := exec.Command(os.Args[0], args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
// put socket FD at the first entry
cmd.ExtraFiles = []*os.File{f}
cmd.Start()
srv.signalShutdown()
}
return
}
case <-srv.close:
log.Println("close gnet")
srv.signalShutdown()
return
}
}
func (srv *server) waitClose() {
var wg sync.WaitGroup
srv.connections.Range(func(key, value interface{}) bool {
c := value.(*conn)
wg.Add(1)
_ = c.loop.poller.Trigger(func(i interface{}) error {
if c != nil {
if c.state == connStateOk {
srv.eventHandler.SignalClose(c)
}
}
wg.Done()
return nil
}, nil)
return true
})
wg.Wait()
}