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