github.com/polarismesh/polaris@v1.17.8/common/conn/keepalive/keepalive.go (about)

     1  /**
     2   * Tencent is pleased to support the open source community by making Polaris available.
     3   *
     4   * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
     5   *
     6   * Licensed under the BSD 3-Clause License (the "License");
     7   * you may not use this file except in compliance with the License.
     8   * You may obtain a copy of the License at
     9   *
    10   * https://opensource.org/licenses/BSD-3-Clause
    11   *
    12   * Unless required by applicable law or agreed to in writing, software distributed
    13   * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
    14   * CONDITIONS OF ANY KIND, either express or implied. See the License for the
    15   * specific language governing permissions and limitations under the License.
    16   */
    17  
    18  package keepalive
    19  
    20  import (
    21  	"net"
    22  	"time"
    23  )
    24  
    25  var DefaultAlivePeriodTime = 3 * time.Minute
    26  
    27  // tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
    28  // connections. It's used by ListenAndServe and ListenAndServeTLS so
    29  // dead TCP connections (e.g. closing laptop mid-download) eventually
    30  // go away.
    31  // 来自net/http
    32  type TcpKeepAliveListener struct {
    33  	periodTime time.Duration
    34  	*net.TCPListener
    35  }
    36  
    37  func NewTcpKeepAliveListener(periodTime time.Duration, ln *net.TCPListener) net.Listener {
    38  	return &TcpKeepAliveListener{
    39  		periodTime:  periodTime,
    40  		TCPListener: ln,
    41  	}
    42  }
    43  
    44  // Accept 来自于net/http
    45  func (ln TcpKeepAliveListener) Accept() (net.Conn, error) {
    46  	tc, err := ln.AcceptTCP()
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  	err = tc.SetKeepAlive(true)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  
    55  	err = tc.SetKeepAlivePeriod(ln.periodTime)
    56  	if err != nil {
    57  		return nil, err
    58  	}
    59  
    60  	return tc, nil
    61  }