mirror of
https://github.com/astaxie/beego.git
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294 lines
6.8 KiB
Go
294 lines
6.8 KiB
Go
package grace
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import (
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"crypto/tls"
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"os/exec"
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"os/signal"
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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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// Server embedded http.Server
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type Server struct {
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*http.Server
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GraceListener net.Listener
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SignalHooks map[int]map[os.Signal][]func()
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tlsInnerListener *graceListener
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wg sync.WaitGroup
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sigChan chan os.Signal
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isChild bool
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state uint8
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Network string
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}
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// Serve accepts incoming connections on the Listener l,
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// creating a new service goroutine for each.
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// The service goroutines read requests and then call srv.Handler to reply to them.
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func (srv *Server) Serve() (err error) {
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srv.state = StateRunning
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err = srv.Server.Serve(srv.GraceListener)
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log.Println(syscall.Getpid(), "Waiting for connections to finish...")
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srv.wg.Wait()
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srv.state = StateTerminate
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return
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}
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// ListenAndServe listens on the TCP network address srv.Addr and then calls Serve
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// to handle requests on incoming connections. If srv.Addr is blank, ":http" is
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// used.
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func (srv *Server) ListenAndServe() (err error) {
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addr := srv.Addr
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if addr == "" {
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addr = ":http"
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}
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go srv.handleSignals()
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l, err := srv.getListener(addr)
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if err != nil {
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log.Println(err)
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return err
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}
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srv.GraceListener = newGraceListener(l, srv)
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if srv.isChild {
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process, err := os.FindProcess(os.Getppid())
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if err != nil {
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log.Println(err)
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return err
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}
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err = process.Kill()
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if err != nil {
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return err
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}
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}
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log.Println(os.Getpid(), srv.Addr)
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return srv.Serve()
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}
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// ListenAndServeTLS listens on the TCP network address srv.Addr and then calls
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// Serve to handle requests on incoming TLS connections.
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//
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// Filenames containing a certificate and matching private key for the server must
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// be provided. If the certificate is signed by a certificate authority, the
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// certFile should be the concatenation of the server's certificate followed by the
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// CA's certificate.
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//
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// If srv.Addr is blank, ":https" is used.
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func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
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addr := srv.Addr
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if addr == "" {
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addr = ":https"
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}
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config := &tls.Config{}
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if srv.TLSConfig != nil {
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*config = *srv.TLSConfig
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}
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if config.NextProtos == nil {
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config.NextProtos = []string{"http/1.1"}
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}
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config.Certificates = make([]tls.Certificate, 1)
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config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return
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}
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go srv.handleSignals()
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l, err := srv.getListener(addr)
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if err != nil {
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log.Println(err)
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return err
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}
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srv.tlsInnerListener = newGraceListener(l, srv)
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srv.GraceListener = tls.NewListener(srv.tlsInnerListener, config)
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if srv.isChild {
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process, err := os.FindProcess(os.Getppid())
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if err != nil {
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log.Println(err)
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return err
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}
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err = process.Kill()
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if err != nil {
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return err
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}
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}
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log.Println(os.Getpid(), srv.Addr)
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return srv.Serve()
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}
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// getListener either opens a new socket to listen on, or takes the acceptor socket
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// it got passed when restarted.
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func (srv *Server) getListener(laddr string) (l net.Listener, err error) {
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if srv.isChild {
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var ptrOffset uint
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if len(socketPtrOffsetMap) > 0 {
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ptrOffset = socketPtrOffsetMap[laddr]
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log.Println("laddr", laddr, "ptr offset", socketPtrOffsetMap[laddr])
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}
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f := os.NewFile(uintptr(3+ptrOffset), "")
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l, err = net.FileListener(f)
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if err != nil {
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err = fmt.Errorf("net.FileListener error: %v", err)
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return
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}
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} else {
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l, err = net.Listen(srv.Network, laddr)
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if err != nil {
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err = fmt.Errorf("net.Listen error: %v", err)
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return
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}
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}
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return
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}
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// handleSignals listens for os Signals and calls any hooked in function that the
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// user had registered with the signal.
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func (srv *Server) handleSignals() {
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var sig os.Signal
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signal.Notify(
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srv.sigChan,
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syscall.SIGHUP,
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syscall.SIGINT,
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syscall.SIGTERM,
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)
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pid := syscall.Getpid()
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for {
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sig = <-srv.sigChan
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srv.signalHooks(PreSignal, sig)
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switch sig {
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case syscall.SIGHUP:
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log.Println(pid, "Received SIGHUP. forking.")
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err := srv.fork()
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if err != nil {
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log.Println("Fork err:", err)
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}
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case syscall.SIGINT:
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log.Println(pid, "Received SIGINT.")
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srv.shutdown()
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case syscall.SIGTERM:
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log.Println(pid, "Received SIGTERM.")
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srv.shutdown()
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default:
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log.Printf("Received %v: nothing i care about...\n", sig)
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}
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srv.signalHooks(PostSignal, sig)
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}
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}
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func (srv *Server) signalHooks(ppFlag int, sig os.Signal) {
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if _, notSet := srv.SignalHooks[ppFlag][sig]; !notSet {
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return
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}
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for _, f := range srv.SignalHooks[ppFlag][sig] {
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f()
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}
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return
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}
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// shutdown closes the listener so that no new connections are accepted. it also
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// starts a goroutine that will serverTimeout (stop all running requests) the server
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// after DefaultTimeout.
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func (srv *Server) shutdown() {
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if srv.state != StateRunning {
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return
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}
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srv.state = StateShuttingDown
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if DefaultTimeout >= 0 {
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go srv.serverTimeout(DefaultTimeout)
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}
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err := srv.GraceListener.Close()
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if err != nil {
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log.Println(syscall.Getpid(), "Listener.Close() error:", err)
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} else {
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log.Println(syscall.Getpid(), srv.GraceListener.Addr(), "Listener closed.")
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}
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}
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// serverTimeout forces the server to shutdown in a given timeout - whether it
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// finished outstanding requests or not. if Read/WriteTimeout are not set or the
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// max header size is very big a connection could hang
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func (srv *Server) serverTimeout(d time.Duration) {
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defer func() {
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if r := recover(); r != nil {
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log.Println("WaitGroup at 0", r)
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}
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}()
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if srv.state != StateShuttingDown {
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return
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}
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time.Sleep(d)
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log.Println("[STOP - Hammer Time] Forcefully shutting down parent")
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for {
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if srv.state == StateTerminate {
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break
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}
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srv.wg.Done()
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}
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}
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func (srv *Server) fork() (err error) {
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regLock.Lock()
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defer regLock.Unlock()
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if runningServersForked {
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return
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}
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runningServersForked = true
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var files = make([]*os.File, len(runningServers))
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var orderArgs = make([]string, len(runningServers))
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for _, srvPtr := range runningServers {
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switch srvPtr.GraceListener.(type) {
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case *graceListener:
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files[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.GraceListener.(*graceListener).File()
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default:
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files[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.tlsInnerListener.File()
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}
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orderArgs[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.Server.Addr
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}
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log.Println(files)
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path := os.Args[0]
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var args []string
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if len(os.Args) > 1 {
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for _, arg := range os.Args[1:] {
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if arg == "-graceful" {
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break
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}
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args = append(args, arg)
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}
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}
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args = append(args, "-graceful")
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if len(runningServers) > 1 {
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args = append(args, fmt.Sprintf(`-socketorder=%s`, strings.Join(orderArgs, ",")))
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log.Println(args)
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}
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cmd := exec.Command(path, args...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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cmd.ExtraFiles = files
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err = cmd.Start()
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if err != nil {
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log.Fatalf("Restart: Failed to launch, error: %v", err)
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}
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return
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}
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