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https://github.com/astaxie/beego.git
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Merge pull request #3494 from nuczzz/develop
simplify beego grace with http.Shutdown
This commit is contained in:
astaxie
GitHub
commit
422e8285b5
@ -1,38 +0,0 @@
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package grace
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import (
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"errors"
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"net"
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"sync"
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)
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type graceConn struct {
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net.Conn
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server *Server
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m sync.Mutex
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closed bool
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}
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func (c *graceConn) Close() (err error) {
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defer func() {
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if r := recover(); r != nil {
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switch x := r.(type) {
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case string:
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err = errors.New(x)
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case error:
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err = x
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default:
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err = errors.New("Unknown panic")
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}
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}
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}()
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c.m.Lock()
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defer c.m.Unlock()
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if c.closed {
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return
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}
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c.server.wg.Done()
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c.closed = true
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return c.Conn.Close()
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}
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@ -122,7 +122,6 @@ func NewServer(addr string, handler http.Handler) (srv *Server) {
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}
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srv = &Server{
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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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@ -137,20 +136,21 @@ func NewServer(addr string, handler http.Handler) (srv *Server) {
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syscall.SIGTERM: {},
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},
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},
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state: StateInit,
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Network: "tcp",
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state: StateInit,
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Network: "tcp",
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terminalChan: make(chan error), //no cache channel
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}
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srv.Server = &http.Server{
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Addr: addr,
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ReadTimeout: DefaultReadTimeOut,
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WriteTimeout: DefaultWriteTimeOut,
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MaxHeaderBytes: DefaultMaxHeaderBytes,
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Handler: handler,
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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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return srv
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}
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// ListenAndServe refer http.ListenAndServe
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@ -1,62 +0,0 @@
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package grace
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import (
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"net"
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"os"
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"syscall"
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"time"
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)
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type graceListener struct {
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net.Listener
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stop chan error
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stopped bool
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server *Server
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}
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func newGraceListener(l net.Listener, srv *Server) (el *graceListener) {
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el = &graceListener{
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Listener: l,
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stop: make(chan error),
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server: srv,
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}
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go func() {
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<-el.stop
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el.stopped = true
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el.stop <- el.Listener.Close()
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}()
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return
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}
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func (gl *graceListener) Accept() (c net.Conn, err error) {
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tc, err := gl.Listener.(*net.TCPListener).AcceptTCP()
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if err != nil {
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return
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}
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tc.SetKeepAlive(true)
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tc.SetKeepAlivePeriod(3 * time.Minute)
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c = &graceConn{
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Conn: tc,
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server: gl.server,
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}
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gl.server.wg.Add(1)
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return
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}
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func (gl *graceListener) Close() error {
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if gl.stopped {
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return syscall.EINVAL
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}
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gl.stop <- nil
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return <-gl.stop
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}
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func (gl *graceListener) File() *os.File {
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// returns a dup(2) - FD_CLOEXEC flag *not* set
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tl := gl.Listener.(*net.TCPListener)
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fl, _ := tl.File()
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return fl
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}
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115
grace/server.go
115
grace/server.go
@ -1,6 +1,7 @@
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package grace
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"fmt"
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@ -12,7 +13,6 @@ import (
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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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@ -20,31 +20,33 @@ import (
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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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ln net.Listener
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SignalHooks map[int]map[os.Signal][]func()
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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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terminalChan chan error
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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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defer func() {
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if r := recover(); r != nil {
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log.Println("wait group counter is negative", r)
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}
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}()
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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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defer func() { srv.state = StateTerminate }()
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// When Shutdown is called, Serve, ListenAndServe, and ListenAndServeTLS
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// immediately return ErrServerClosed. Make sure the program doesn't exit
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// and waits instead for Shutdown to return.
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if err = srv.Server.Serve(srv.ln); err != nil && err != http.ErrServerClosed {
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log.Println(syscall.Getpid(), "Server.Serve() error:", err)
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return err
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}
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log.Println(syscall.Getpid(), srv.ln.Addr(), "Listener closed.")
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// wait for Shutdown to return
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return <-srv.terminalChan
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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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@ -58,14 +60,12 @@ func (srv *Server) ListenAndServe() (err error) {
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go srv.handleSignals()
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l, err := srv.getListener(addr)
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srv.ln, 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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@ -112,14 +112,12 @@ func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
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go srv.handleSignals()
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l, err := srv.getListener(addr)
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ln, 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, srv.TLSConfig)
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srv.ln = tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
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if srv.isChild {
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process, err := os.FindProcess(os.Getppid())
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@ -132,6 +130,7 @@ func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
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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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@ -168,14 +167,12 @@ func (srv *Server) ListenAndServeMutualTLS(certFile, keyFile, trustFile string)
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log.Println("Mutual HTTPS")
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go srv.handleSignals()
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l, err := srv.getListener(addr)
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ln, 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, srv.TLSConfig)
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srv.ln = tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
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if srv.isChild {
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process, err := os.FindProcess(os.Getppid())
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@ -188,6 +185,7 @@ func (srv *Server) ListenAndServeMutualTLS(certFile, keyFile, trustFile string)
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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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@ -218,6 +216,20 @@ func (srv *Server) getListener(laddr string) (l net.Listener, err error) {
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return
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}
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type tcpKeepAliveListener struct {
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*net.TCPListener
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}
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func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return
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}
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tc.SetKeepAlive(true)
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tc.SetKeepAlivePeriod(3 * time.Minute)
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return tc, nil
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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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@ -270,37 +282,14 @@ func (srv *Server) shutdown() {
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}
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srv.state = StateShuttingDown
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log.Println(syscall.Getpid(), "Waiting for connections to finish...")
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ctx := context.Background()
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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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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(context.Background(), DefaultTimeout)
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defer cancel()
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}
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srv.terminalChan <- srv.Server.Shutdown(ctx)
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}
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func (srv *Server) fork() (err error) {
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@ -314,12 +303,8 @@ func (srv *Server) fork() (err error) {
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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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f, _ := srvPtr.ln.(*net.TCPListener).File()
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files[socketPtrOffsetMap[srvPtr.Server.Addr]] = f
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orderArgs[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.Server.Addr
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}
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