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107 lines
3.2 KiB
107 lines
3.2 KiB
/*
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Package graceful implements graceful shutdown for HTTP servers by closing idle
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connections after receiving a signal. By default, this package listens for
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interrupts (i.e., SIGINT), but when it detects that it is running under Einhorn
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it will additionally listen for SIGUSR2 as well, giving your application
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automatic support for graceful restarts/code upgrades.
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*/
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package graceful
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import (
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"crypto/tls"
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"net"
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"net/http"
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"github.com/zenazn/goji/graceful/listener"
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)
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// Most of the code here is lifted straight from net/http
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// Type Server is exactly the same as an http.Server, but provides more graceful
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// implementations of its methods.
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type Server http.Server
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func (srv *Server) ListenAndServe() 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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l, e := net.Listen("tcp", addr)
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if e != nil {
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return e
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}
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return srv.Serve(l)
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}
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// Unlike the method of the same name on http.Server, this function defaults to
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// enforcing TLS 1.0 or higher in order to address the POODLE vulnerability.
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// Users who wish to enable SSLv3 must do so by supplying a TLSConfig
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// explicitly.
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func (srv *Server) ListenAndServeTLS(certFile, keyFile string) 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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MinVersion: tls.VersionTLS10,
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}
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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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var err error
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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 err
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}
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conn, err := net.Listen("tcp", addr)
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if err != nil {
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return err
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}
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tlsListener := tls.NewListener(conn, config)
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return srv.Serve(tlsListener)
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}
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// ListenAndServe behaves exactly like the net/http function of the same name.
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func ListenAndServe(addr string, handler http.Handler) error {
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server := &Server{Addr: addr, Handler: handler}
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return server.ListenAndServe()
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}
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// ListenAndServeTLS behaves almost exactly like the net/http function of the
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// same name. Unlike net/http, however, this function defaults to enforcing TLS
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// 1.0 or higher in order to address the POODLE vulnerability. Users who wish to
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// enable SSLv3 must do so by explicitly instantiating a server with an
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// appropriately configured TLSConfig property.
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func ListenAndServeTLS(addr, certfile, keyfile string, handler http.Handler) error {
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server := &Server{Addr: addr, Handler: handler}
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return server.ListenAndServeTLS(certfile, keyfile)
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}
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// Serve behaves exactly like the net/http function of the same name.
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func Serve(l net.Listener, handler http.Handler) error {
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server := &Server{Handler: handler}
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return server.Serve(l)
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}
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// WrapListener wraps an arbitrary net.Listener for use with graceful shutdowns.
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// In the background, it uses the listener sub-package to Wrap the listener in
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// Deadline mode. If another mode of operation is desired, you should call
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// listener.Wrap yourself: this function is smart enough to not double-wrap
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// listeners.
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func WrapListener(l net.Listener) net.Listener {
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if lt, ok := l.(*listener.T); ok {
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appendListener(lt)
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return lt
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}
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lt := listener.Wrap(l, listener.Deadline)
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appendListener(lt)
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return lt
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}
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