151 lines
3.7 KiB
Go
151 lines
3.7 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Description: http://grisha.org/blog/2014/06/03/graceful-restart-in-golang/
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//
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// Usage:
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//
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// import(
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// "log"
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// "net/http"
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// "os"
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//
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// "github.com/astaxie/beego/grace"
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// )
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//
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// func handler(w http.ResponseWriter, r *http.Request) {
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// w.Write([]byte("WORLD!"))
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// }
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//
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// func main() {
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// mux := http.NewServeMux()
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// mux.HandleFunc("/hello", handler)
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//
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// err := grace.ListenAndServe("localhost:8080", mux1)
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// if err != nil {
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// log.Println(err)
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// }
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// log.Println("Server on 8080 stopped")
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// os.Exit(0)
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// }
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package grace
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import (
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"flag"
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"net/http"
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"os"
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"strings"
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"sync"
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"syscall"
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"time"
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)
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const (
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PRE_SIGNAL = iota
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POST_SIGNAL
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STATE_INIT
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STATE_RUNNING
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STATE_SHUTTING_DOWN
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STATE_TERMINATE
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)
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var (
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regLock *sync.Mutex
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runningServers map[string]*graceServer
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runningServersOrder []string
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socketPtrOffsetMap map[string]uint
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runningServersForked bool
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DefaultReadTimeOut time.Duration
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DefaultWriteTimeOut time.Duration
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DefaultMaxHeaderBytes int
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DefaultTimeout time.Duration
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isChild bool
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socketOrder string
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)
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func init() {
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regLock = &sync.Mutex{}
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flag.BoolVar(&isChild, "graceful", false, "listen on open fd (after forking)")
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flag.StringVar(&socketOrder, "socketorder", "", "previous initialization order - used when more than one listener was started")
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runningServers = make(map[string]*graceServer)
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runningServersOrder = []string{}
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socketPtrOffsetMap = make(map[string]uint)
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DefaultMaxHeaderBytes = 0
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DefaultTimeout = 60 * time.Second
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}
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// NewServer returns a new graceServer.
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func NewServer(addr string, handler http.Handler) (srv *graceServer) {
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regLock.Lock()
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defer regLock.Unlock()
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if !flag.Parsed() {
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flag.Parse()
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}
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if len(socketOrder) > 0 {
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for i, addr := range strings.Split(socketOrder, ",") {
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socketPtrOffsetMap[addr] = uint(i)
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}
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} else {
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socketPtrOffsetMap[addr] = uint(len(runningServersOrder))
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}
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srv = &graceServer{
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wg: sync.WaitGroup{},
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sigChan: make(chan os.Signal),
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isChild: isChild,
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SignalHooks: map[int]map[os.Signal][]func(){
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PRE_SIGNAL: map[os.Signal][]func(){
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syscall.SIGHUP: []func(){},
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syscall.SIGINT: []func(){},
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syscall.SIGTERM: []func(){},
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},
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POST_SIGNAL: map[os.Signal][]func(){
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syscall.SIGHUP: []func(){},
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syscall.SIGINT: []func(){},
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syscall.SIGTERM: []func(){},
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},
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},
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state: STATE_INIT,
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Network: "tcp",
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}
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srv.Server = &http.Server{}
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srv.Server.Addr = addr
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srv.Server.ReadTimeout = DefaultReadTimeOut
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srv.Server.WriteTimeout = DefaultWriteTimeOut
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srv.Server.MaxHeaderBytes = DefaultMaxHeaderBytes
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srv.Server.Handler = handler
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runningServersOrder = append(runningServersOrder, addr)
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runningServers[addr] = srv
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return
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}
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// refer http.ListenAndServe
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func ListenAndServe(addr string, handler http.Handler) error {
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server := NewServer(addr, handler)
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return server.ListenAndServe()
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}
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// refer http.ListenAndServeTLS
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func ListenAndServeTLS(addr string, certFile string, keyFile string, handler http.Handler) error {
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server := NewServer(addr, handler)
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return server.ListenAndServeTLS(certFile, keyFile)
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}
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