vitess.io/vitess@v0.16.2/go/vt/servenv/unix_socket.go (about) 1 /* 2 Copyright 2019 The Vitess Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package servenv 18 19 import ( 20 "net" 21 "os" 22 23 "github.com/spf13/pflag" 24 25 "vitess.io/vitess/go/vt/log" 26 ) 27 28 var ( 29 // socketFile has the flag used when calling 30 // RegisterDefaultSocketFileFlags. 31 socketFile string 32 ) 33 34 // serveSocketFile listen to the named socket and serves RPCs on it. 35 func serveSocketFile() { 36 if socketFile == "" { 37 log.Infof("Not listening on socket file") 38 return 39 } 40 name := socketFile 41 42 // try to delete if file exists 43 if _, err := os.Stat(name); err == nil { 44 err = os.Remove(name) 45 if err != nil { 46 log.Exitf("Cannot remove socket file %v: %v", name, err) 47 } 48 } 49 50 l, err := net.Listen("unix", name) 51 if err != nil { 52 log.Exitf("Error listening on socket file %v: %v", name, err) 53 } 54 log.Infof("Listening on socket file %v for gRPC", name) 55 go GRPCServer.Serve(l) 56 } 57 58 // RegisterDefaultSocketFileFlags registers the default flags for listening 59 // to a socket. This needs to be called before flags are parsed. 60 func RegisterDefaultSocketFileFlags() { 61 OnParse(func(fs *pflag.FlagSet) { 62 fs.StringVar(&socketFile, "socket_file", socketFile, "Local unix socket file to listen on") 63 }) 64 }