github.com/julesgoullee/go-ethereum@v1.9.7/rpc/stdio.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 rpc
    18  
    19  import (
    20  	"context"
    21  	"errors"
    22  	"io"
    23  	"net"
    24  	"os"
    25  	"time"
    26  )
    27  
    28  // DialStdIO creates a client on stdin/stdout.
    29  func DialStdIO(ctx context.Context) (*Client, error) {
    30  	return DialIO(ctx, os.Stdin, os.Stdout)
    31  }
    32  
    33  // DialIO creates a client which uses the given IO channels
    34  func DialIO(ctx context.Context, in io.Reader, out io.Writer) (*Client, error) {
    35  	return newClient(ctx, func(_ context.Context) (ServerCodec, error) {
    36  		return NewJSONCodec(stdioConn{
    37  			in:  in,
    38  			out: out,
    39  		}), nil
    40  	})
    41  }
    42  
    43  type stdioConn struct {
    44  	in  io.Reader
    45  	out io.Writer
    46  }
    47  
    48  func (io stdioConn) Read(b []byte) (n int, err error) {
    49  	return io.in.Read(b)
    50  }
    51  
    52  func (io stdioConn) Write(b []byte) (n int, err error) {
    53  	return io.out.Write(b)
    54  }
    55  
    56  func (io stdioConn) Close() error {
    57  	return nil
    58  }
    59  
    60  func (io stdioConn) RemoteAddr() string {
    61  	return "/dev/stdin"
    62  }
    63  
    64  func (io stdioConn) SetWriteDeadline(t time.Time) error {
    65  	return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
    66  }