github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/p2p/simulations/pipes/pipes.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package pipes
    19  
    20  import (
    21  	"net"
    22  )
    23  
    24  // NetPipe wraps net.Pipe in a signature returning an error
    25  func NetPipe() (net.Conn, net.Conn, error) {
    26  	p1, p2 := net.Pipe()
    27  	return p1, p2, nil
    28  }
    29  
    30  // TCPPipe creates an in process full duplex pipe based on a localhost TCP socket
    31  func TCPPipe() (net.Conn, net.Conn, error) {
    32  	l, err := net.Listen("tcp", "127.0.0.1:0")
    33  	if err != nil {
    34  		return nil, nil, err
    35  	}
    36  	defer l.Close()
    37  
    38  	var aconn net.Conn
    39  	aerr := make(chan error, 1)
    40  	go func() {
    41  		var err error
    42  		aconn, err = l.Accept()
    43  		aerr <- err
    44  	}()
    45  
    46  	dconn, err := net.Dial("tcp", l.Addr().String())
    47  	if err != nil {
    48  		<-aerr
    49  		return nil, nil, err
    50  	}
    51  	if err := <-aerr; err != nil {
    52  		dconn.Close()
    53  		return nil, nil, err
    54  	}
    55  	return aconn, dconn, nil
    56  }