github.com/Night-mk/quorum@v21.1.0+incompatible/raft/listener.go (about)

     1  // Copyright 2015 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package raft
    16  
    17  import (
    18  	"errors"
    19  	"net"
    20  	"time"
    21  )
    22  
    23  // stoppableListener sets TCP keep-alive timeouts on accepted
    24  // connections and waits on stopc message
    25  type stoppableListener struct {
    26  	*net.TCPListener
    27  	stopc <-chan struct{}
    28  }
    29  
    30  func newStoppableListener(addr string, stopc <-chan struct{}) (*stoppableListener, error) {
    31  	ln, err := net.Listen("tcp", addr)
    32  	if err != nil {
    33  		return nil, err
    34  	}
    35  	return &stoppableListener{ln.(*net.TCPListener), stopc}, nil
    36  }
    37  
    38  func (ln stoppableListener) Accept() (c net.Conn, err error) {
    39  	connc := make(chan *net.TCPConn, 1)
    40  	errc := make(chan error, 1)
    41  	go func() {
    42  		tc, err := ln.AcceptTCP()
    43  		if err != nil {
    44  			errc <- err
    45  			return
    46  		}
    47  		connc <- tc
    48  	}()
    49  	select {
    50  	case <-ln.stopc:
    51  		return nil, errors.New("server stopped")
    52  	case err := <-errc:
    53  		return nil, err
    54  	case tc := <-connc:
    55  		tc.SetKeepAlive(true)
    56  		tc.SetKeepAlivePeriod(3 * time.Minute)
    57  		return tc, nil
    58  	}
    59  }