| // Copyright 2015 The etcd Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package main |
| |
| import ( |
| "errors" |
| "net" |
| "time" |
| ) |
| |
| // stoppableListener sets TCP keep-alive timeouts on accepted |
| // connections and waits on stopc message |
| type stoppableListener struct { |
| *net.TCPListener |
| stopc <-chan struct{} |
| } |
| |
| func newStoppableListener(addr string, stopc <-chan struct{}) (*stoppableListener, error) { |
| ln, err := net.Listen("tcp", addr) |
| if err != nil { |
| return nil, err |
| } |
| return &stoppableListener{ln.(*net.TCPListener), stopc}, nil |
| } |
| |
| func (ln stoppableListener) Accept() (c net.Conn, err error) { |
| connc := make(chan *net.TCPConn, 1) |
| errc := make(chan error, 1) |
| go func() { |
| tc, err := ln.AcceptTCP() |
| if err != nil { |
| errc <- err |
| return |
| } |
| connc <- tc |
| }() |
| select { |
| case <-ln.stopc: |
| return nil, errors.New("server stopped") |
| case err := <-errc: |
| return nil, err |
| case tc := <-connc: |
| tc.SetKeepAlive(true) |
| tc.SetKeepAlivePeriod(3 * time.Minute) |
| return tc, nil |
| } |
| } |