mirror of
https://github.com/HDT3213/godis.git
synced 2025-09-26 21:01:17 +08:00
99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
package tcp
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/**
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* A tcp server
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*/
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import (
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"context"
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"fmt"
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"net"
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"os"
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"os/signal"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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"github.com/hdt3213/godis/interface/tcp"
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"github.com/hdt3213/godis/lib/logger"
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)
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// Config stores tcp server properties
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type Config struct {
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Address string `yaml:"address"`
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MaxConnect uint32 `yaml:"max-connect"`
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Timeout time.Duration `yaml:"timeout"`
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}
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// ClientCounter Record the number of clients in the current Godis server
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var ClientCounter int32
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// ListenAndServeWithSignal binds port and handle requests, blocking until receive stop signal
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func ListenAndServeWithSignal(cfg *Config, handler tcp.Handler) error {
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closeChan := make(chan struct{})
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sigCh := make(chan os.Signal)
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signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT)
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go func() {
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sig := <-sigCh
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switch sig {
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case syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT:
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closeChan <- struct{}{}
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}
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}()
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listener, err := net.Listen("tcp", cfg.Address)
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if err != nil {
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return err
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}
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//cfg.Address = listener.Addr().String()
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logger.Info(fmt.Sprintf("bind: %s, start listening...", cfg.Address))
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ListenAndServe(listener, handler, closeChan)
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return nil
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}
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// ListenAndServe binds port and handle requests, blocking until close
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func ListenAndServe(listener net.Listener, handler tcp.Handler, closeChan <-chan struct{}) {
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// listen signal
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errCh := make(chan error, 1)
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defer close(errCh)
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go func() {
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select {
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case <-closeChan:
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logger.Info("get exit signal")
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case er := <-errCh:
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logger.Info(fmt.Sprintf("accept error: %s", er.Error()))
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}
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logger.Info("shutting down...")
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_ = listener.Close() // listener.Accept() will return err immediately
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_ = handler.Close() // close connections
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}()
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ctx := context.Background()
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var waitDone sync.WaitGroup
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for {
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conn, err := listener.Accept()
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if err != nil {
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// learn from net/http/serve.go#Serve()
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if ne, ok := err.(net.Error); ok && ne.Timeout() {
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logger.Infof("accept occurs temporary error: %v, retry in 5ms", err)
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time.Sleep(5 * time.Millisecond)
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continue
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}
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errCh <- err
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break
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}
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// handle
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// logger.Info("accept link")
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ClientCounter++
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waitDone.Add(1)
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go func() {
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defer func() {
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waitDone.Done()
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atomic.AddInt32(&ClientCounter, -1)
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}()
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handler.Handle(ctx, conn)
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}()
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}
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waitDone.Wait()
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}
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