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split into small files
This commit is contained in:
astaxie
parent
ae37689314
commit
3abd01799d
13
grace/conn.go
Normal file
13
grace/conn.go
Normal file
@ -0,0 +1,13 @@
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package grace
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import "net"
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type graceConn struct {
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net.Conn
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server *graceServer
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}
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func (c graceConn) Close() error {
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c.server.wg.Done()
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return c.Conn.Close()
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}
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377
grace/grace.go
377
grace/grace.go
@ -42,15 +42,9 @@
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package grace
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import (
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"crypto/tls"
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"flag"
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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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@ -93,25 +87,10 @@ func init() {
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DefaultMaxHeaderBytes = 0
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// after a restart the parent will finish ongoing requests before
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// shutting down. set to a negative value to disable
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DefaultTimeout = 60 * time.Second
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}
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type graceServer 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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// NewServer returns an intialized graceServer. Calling Serve on it will
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// actually "start" the server.
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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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@ -158,364 +137,14 @@ func NewServer(addr string, handler http.Handler) (srv *graceServer) {
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return
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}
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// ListenAndServe listens on the TCP network address addr
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// and then calls Serve to handle requests on incoming connections.
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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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// ListenAndServeTLS listens on the TCP network address 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 be provided.
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// If the certificate is signed by a certificate authority,
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// the certFile should be the concatenation of the server's certificate followed by the CA's certificate.
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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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// 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 *graceServer) Serve() (err error) {
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srv.state = STATE_RUNNING
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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 = STATE_TERMINATE
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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 *graceServer) 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 *graceServer) 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 *graceServer) getListener(laddr string) (l net.Listener, err error) {
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if srv.isChild {
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var ptrOffset uint = 0
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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 *graceServer) 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(PRE_SIGNAL, 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(POST_SIGNAL, sig)
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}
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}
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func (srv *graceServer) 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 hammer (stop all running requests) the server
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// after DefaultTimeout.
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func (srv *graceServer) shutdown() {
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if srv.state != STATE_RUNNING {
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return
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}
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srv.state = STATE_SHUTTING_DOWN
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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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// hammerTime 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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//
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// srv.Serve() will not return until all connections are served. this will
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// unblock the srv.wg.Wait() in Serve() thus causing ListenAndServe(TLS) to
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// return.
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func (srv *graceServer) serverTimeout(d time.Duration) {
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defer func() {
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// we are calling srv.wg.Done() until it panics which means we called
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// Done() when the counter was already at 0 and we're done.
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// (and thus Serve() will return and the parent will exit)
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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 != STATE_SHUTTING_DOWN {
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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 == STATE_TERMINATE {
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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 *graceServer) fork() (err error) {
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// only one server isntance should fork!
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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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// get the accessor socket fds for _all_ server instances
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for _, srvPtr := range runningServers {
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// introspect.PrintTypeDump(srvPtr.EndlessListener)
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switch srvPtr.GraceListener.(type) {
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case *graceListener:
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// normal listener
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files[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.GraceListener.(*graceListener).File()
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default:
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// tls listener
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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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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 *graceServer
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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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|
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tc.SetKeepAlive(true) // see http.tcpKeepAliveListener
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tc.SetKeepAlivePeriod(3 * time.Minute) // see http.tcpKeepAliveListener
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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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|
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gl.server.wg.Add(1)
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return
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}
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|
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func newGraceListener(l net.Listener, srv *graceServer) (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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|
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// Starting the listener for the stop signal here because Accept blocks on
|
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// el.Listener.(*net.TCPListener).AcceptTCP()
|
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// The goroutine will unblock it by closing the listeners fd
|
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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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|
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func (el *graceListener) Close() error {
|
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if el.stopped {
|
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return syscall.EINVAL
|
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}
|
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el.stop <- nil
|
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return <-el.stop
|
||||
}
|
||||
|
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func (el *graceListener) File() *os.File {
|
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// returns a dup(2) - FD_CLOEXEC flag *not* set
|
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tl := el.Listener.(*net.TCPListener)
|
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fl, _ := tl.File()
|
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return fl
|
||||
}
|
||||
|
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type graceConn struct {
|
||||
net.Conn
|
||||
server *graceServer
|
||||
}
|
||||
|
||||
func (c graceConn) Close() error {
|
||||
c.server.wg.Done()
|
||||
return c.Conn.Close()
|
||||
}
|
||||
|
||||
62
grace/listener.go
Normal file
62
grace/listener.go
Normal file
@ -0,0 +1,62 @@
|
||||
package grace
|
||||
|
||||
import (
|
||||
"net"
|
||||
"os"
|
||||
"syscall"
|
||||
"time"
|
||||
)
|
||||
|
||||
type graceListener struct {
|
||||
net.Listener
|
||||
stop chan error
|
||||
stopped bool
|
||||
server *graceServer
|
||||
}
|
||||
|
||||
func newGraceListener(l net.Listener, srv *graceServer) (el *graceListener) {
|
||||
el = &graceListener{
|
||||
Listener: l,
|
||||
stop: make(chan error),
|
||||
server: srv,
|
||||
}
|
||||
go func() {
|
||||
_ = <-el.stop
|
||||
el.stopped = true
|
||||
el.stop <- el.Listener.Close()
|
||||
}()
|
||||
return
|
||||
}
|
||||
|
||||
func (gl *graceListener) Accept() (c net.Conn, err error) {
|
||||
tc, err := gl.Listener.(*net.TCPListener).AcceptTCP()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
tc.SetKeepAlive(true)
|
||||
tc.SetKeepAlivePeriod(3 * time.Minute)
|
||||
|
||||
c = graceConn{
|
||||
Conn: tc,
|
||||
server: gl.server,
|
||||
}
|
||||
|
||||
gl.server.wg.Add(1)
|
||||
return
|
||||
}
|
||||
|
||||
func (el *graceListener) Close() error {
|
||||
if el.stopped {
|
||||
return syscall.EINVAL
|
||||
}
|
||||
el.stop <- nil
|
||||
return <-el.stop
|
||||
}
|
||||
|
||||
func (el *graceListener) File() *os.File {
|
||||
// returns a dup(2) - FD_CLOEXEC flag *not* set
|
||||
tl := el.Listener.(*net.TCPListener)
|
||||
fl, _ := tl.File()
|
||||
return fl
|
||||
}
|
||||
292
grace/server.go
Normal file
292
grace/server.go
Normal file
@ -0,0 +1,292 @@
|
||||
package grace
|
||||
|
||||
import (
|
||||
"crypto/tls"
|
||||
"fmt"
|
||||
"log"
|
||||
"net"
|
||||
"net/http"
|
||||
"os"
|
||||
"os/exec"
|
||||
"os/signal"
|
||||
"strings"
|
||||
"sync"
|
||||
"syscall"
|
||||
"time"
|
||||
)
|
||||
|
||||
type graceServer 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 *graceServer) Serve() (err error) {
|
||||
srv.state = STATE_RUNNING
|
||||
err = srv.Server.Serve(srv.GraceListener)
|
||||
log.Println(syscall.Getpid(), "Waiting for connections to finish...")
|
||||
srv.wg.Wait()
|
||||
srv.state = STATE_TERMINATE
|
||||
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 *graceServer) 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 *graceServer) ListenAndServeTLS(certFile, keyFile string) (err error) {
|
||||
addr := srv.Addr
|
||||
if addr == "" {
|
||||
addr = ":https"
|
||||
}
|
||||
|
||||
config := &tls.Config{}
|
||||
if srv.TLSConfig != nil {
|
||||
*config = *srv.TLSConfig
|
||||
}
|
||||
if config.NextProtos == nil {
|
||||
config.NextProtos = []string{"http/1.1"}
|
||||
}
|
||||
|
||||
config.Certificates = make([]tls.Certificate, 1)
|
||||
config.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, config)
|
||||
|
||||
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 *graceServer) getListener(laddr string) (l net.Listener, err error) {
|
||||
if srv.isChild {
|
||||
var ptrOffset uint = 0
|
||||
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 *graceServer) handleSignals() {
|
||||
var sig os.Signal
|
||||
|
||||
signal.Notify(
|
||||
srv.sigChan,
|
||||
syscall.SIGHUP,
|
||||
syscall.SIGINT,
|
||||
syscall.SIGTERM,
|
||||
)
|
||||
|
||||
pid := syscall.Getpid()
|
||||
for {
|
||||
sig = <-srv.sigChan
|
||||
srv.signalHooks(PRE_SIGNAL, 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(POST_SIGNAL, sig)
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *graceServer) signalHooks(ppFlag int, sig os.Signal) {
|
||||
if _, notSet := srv.SignalHooks[ppFlag][sig]; !notSet {
|
||||
return
|
||||
}
|
||||
for _, f := range srv.SignalHooks[ppFlag][sig] {
|
||||
f()
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// 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 *graceServer) shutdown() {
|
||||
if srv.state != STATE_RUNNING {
|
||||
return
|
||||
}
|
||||
|
||||
srv.state = STATE_SHUTTING_DOWN
|
||||
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 *graceServer) serverTimeout(d time.Duration) {
|
||||
defer func() {
|
||||
if r := recover(); r != nil {
|
||||
log.Println("WaitGroup at 0", r)
|
||||
}
|
||||
}()
|
||||
if srv.state != STATE_SHUTTING_DOWN {
|
||||
return
|
||||
}
|
||||
time.Sleep(d)
|
||||
log.Println("[STOP - Hammer Time] Forcefully shutting down parent")
|
||||
for {
|
||||
if srv.state == STATE_TERMINATE {
|
||||
break
|
||||
}
|
||||
srv.wg.Done()
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *graceServer) 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
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user