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