github.com/ethereum/go-ethereum@v1.16.1/p2p/pipes/pipe.go (about)

     1  // Copyright 2018 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package pipes
    18  
    19  import "net"
    20  
    21  // TCPPipe creates an in process full duplex pipe based on a localhost TCP socket.
    22  func TCPPipe() (net.Conn, net.Conn, error) {
    23  	l, err := net.Listen("tcp", "127.0.0.1:0")
    24  	if err != nil {
    25  		return nil, nil, err
    26  	}
    27  	defer l.Close()
    28  
    29  	var aconn net.Conn
    30  	aerr := make(chan error, 1)
    31  	go func() {
    32  		var err error
    33  		aconn, err = l.Accept()
    34  		aerr <- err
    35  	}()
    36  
    37  	dconn, err := net.Dial("tcp", l.Addr().String())
    38  	if err != nil {
    39  		<-aerr
    40  		return nil, nil, err
    41  	}
    42  	if err := <-aerr; err != nil {
    43  		dconn.Close()
    44  		return nil, nil, err
    45  	}
    46  	return aconn, dconn, nil
    47  }