github.com/theQRL/go-zond@v0.1.1/p2p/simulations/pipes/pipes.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 (
    20  	"net"
    21  )
    22  
    23  // NetPipe wraps net.Pipe in a signature returning an error
    24  func NetPipe() (net.Conn, net.Conn, error) {
    25  	p1, p2 := net.Pipe()
    26  	return p1, p2, nil
    27  }
    28  
    29  // TCPPipe creates an in process full duplex pipe based on a localhost TCP socket
    30  func TCPPipe() (net.Conn, net.Conn, error) {
    31  	l, err := net.Listen("tcp", "127.0.0.1:0")
    32  	if err != nil {
    33  		return nil, nil, err
    34  	}
    35  	defer l.Close()
    36  
    37  	var aconn net.Conn
    38  	aerr := make(chan error, 1)
    39  	go func() {
    40  		var err error
    41  		aconn, err = l.Accept()
    42  		aerr <- err
    43  	}()
    44  
    45  	dconn, err := net.Dial("tcp", l.Addr().String())
    46  	if err != nil {
    47  		<-aerr
    48  		return nil, nil, err
    49  	}
    50  	if err := <-aerr; err != nil {
    51  		dconn.Close()
    52  		return nil, nil, err
    53  	}
    54  	return aconn, dconn, nil
    55  }