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unix_socket.go
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/
unix_socket.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package servenv
import (
"flag"
"net"
"os"
log "github.com/golang/glog"
)
var (
// The flags used when calling RegisterDefaultSocketFileFlags.
SocketFile *string
)
// serveSocketFile listen to the named socket and serves RPCs on it.
func serveSocketFile(name string) {
if name == "" {
log.Infof("Not listening on socket file")
return
}
// try to delete if file exists
if _, err := os.Stat(name); err == nil {
err = os.Remove(name)
if err != nil {
log.Fatalf("Cannot remove socket file %v: %v", name, err)
}
}
l, err := net.Listen("unix", name)
if err != nil {
log.Fatalf("Error listening on socket file %v: %v", name, err)
}
log.Infof("Listening on socket file %v for gRPC", name)
go GRPCServer.Serve(l)
}
// RegisterDefaultSocketFileFlags registers the default flags for listening
// to a socket. It also registers an OnRun callback to enable the listening
// socket.
// This needs to be called before flags are parsed.
func RegisterDefaultSocketFileFlags() {
SocketFile = flag.String("socket_file", "", "Local unix socket file to listen on")
OnRun(func() {
serveSocketFile(*SocketFile)
})
}