forked from fabiolb/fabio
/
listen.go
111 lines (92 loc) · 2.45 KB
/
listen.go
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package main
import (
"crypto/tls"
"log"
"net"
"net/http"
"os"
"regexp"
"time"
"github.com/armon/go-proxyproto"
"github.com/eBay/fabio/cert"
"github.com/eBay/fabio/config"
"github.com/eBay/fabio/exit"
"github.com/eBay/fabio/proxy"
)
var quit = make(chan bool)
var commas = regexp.MustCompile(`\s*,\s*`)
var semicolons = regexp.MustCompile(`\s*;\s*`)
func init() {
exit.Listen(func(os.Signal) { close(quit) })
}
// startListeners runs one or more listeners for the handler
func startListeners(listen []config.Listen, wait time.Duration, h http.Handler) {
for _, l := range listen {
go listenAndServe(l, h)
}
// wait for shutdown signal
<-quit
// disable routing for all requests
proxy.Shutdown()
// trigger graceful shutdown
log.Printf("[INFO] Graceful shutdown over %s", wait)
time.Sleep(wait)
log.Print("[INFO] Down")
}
func listenAndServe(l config.Listen, h http.Handler) {
srv := &http.Server{
Handler: h,
Addr: l.Addr,
ReadTimeout: l.ReadTimeout,
WriteTimeout: l.WriteTimeout,
}
if l.Scheme == "https" {
src, err := cert.NewSource(l.CertSource)
if err != nil {
exit.Fatal("[FATAL] ", err)
}
srv.TLSConfig, err = cert.TLSConfig(src)
if err != nil {
exit.Fatal("[FATAL] ", err)
}
}
if srv.TLSConfig != nil {
log.Printf("[INFO] HTTPS proxy listening on %s", l.Addr)
if srv.TLSConfig.ClientAuth == tls.RequireAndVerifyClientCert {
log.Printf("[INFO] Client certificate authentication enabled on %s", l.Addr)
}
} else {
log.Printf("[INFO] HTTP proxy listening on %s", l.Addr)
}
if err := serve(srv); err != nil {
exit.Fatal("[FATAL] ", err)
}
}
func serve(srv *http.Server) error {
ln, err := net.Listen("tcp", srv.Addr)
if err != nil {
exit.Fatal("[FATAL] ", err)
}
ln = &proxyproto.Listener{Listener: tcpKeepAliveListener{ln.(*net.TCPListener)}}
if srv.TLSConfig != nil {
ln = tls.NewListener(ln, srv.TLSConfig)
}
return srv.Serve(ln)
}
// copied from http://golang.org/src/net/http/server.go?s=54604:54695#L1967
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}