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stdio.go
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stdio.go
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//
// (C) Copyright 2019-2020 Intel Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
package pbin
import (
"fmt"
"io"
"net"
"sync"
"time"
"github.com/pkg/errors"
)
// StdioAddr implements net.Addr to provide an emulated network
// address for use with StdioConn.
type StdioAddr struct {
id string
}
func (s *StdioAddr) Network() string {
return "stdio"
}
func (s *StdioAddr) String() string {
return s.id
}
func NewStdioConn(localID, remoteID string, in io.ReadCloser, out io.WriteCloser) *StdioConn {
return &StdioConn{
local: &StdioAddr{localID},
remote: &StdioAddr{remoteID},
in: in,
out: out,
}
}
// StdioConn implements net.Conn to provide an emulated network
// connection between two processes over stdin/stdout.
type StdioConn struct {
sync.RWMutex
readClosed bool
writeClosed bool
local *StdioAddr
remote *StdioAddr
in io.ReadCloser
out io.WriteCloser
}
func (sc *StdioConn) String() string {
return fmt.Sprintf("%s<->%s", sc.LocalAddr(), sc.RemoteAddr())
}
func (sc *StdioConn) isClosed() bool {
sc.RLock()
defer sc.RUnlock()
return sc.writeClosed && sc.readClosed
}
func (sc *StdioConn) isReadClosed() bool {
sc.RLock()
defer sc.RUnlock()
return sc.readClosed
}
func (sc *StdioConn) isWriteClosed() bool {
sc.RLock()
defer sc.RUnlock()
return sc.writeClosed
}
func (sc *StdioConn) Read(b []byte) (int, error) {
if sc.isReadClosed() {
return 0, errors.New("read on closed conn")
}
return sc.in.Read(b)
}
func (sc *StdioConn) Write(b []byte) (int, error) {
if sc.isWriteClosed() {
return 0, errors.New("write on closed conn")
}
return sc.out.Write(b)
}
func (sc *StdioConn) CloseRead() error {
sc.Lock()
defer sc.Unlock()
sc.readClosed = true
return sc.in.Close()
}
func (sc *StdioConn) CloseWrite() error {
sc.Lock()
defer sc.Unlock()
sc.writeClosed = true
return sc.out.Close()
}
func (sc *StdioConn) Close() error {
if err := sc.CloseRead(); err != nil {
return err
}
return sc.CloseWrite()
}
func (sc *StdioConn) LocalAddr() net.Addr {
return sc.local
}
func (sc *StdioConn) RemoteAddr() net.Addr {
return sc.remote
}
func (sc *StdioConn) SetDeadline(t time.Time) error {
return nil
}
func (sc *StdioConn) SetReadDeadline(t time.Time) error {
return nil
}
func (sc *StdioConn) SetWriteDeadline(t time.Time) error {
return nil
}
func NewStdioListener(conn *StdioConn) *StdioListener {
sl := &StdioListener{
ready: make(chan *StdioConn),
conn: conn,
}
sl.Close()
return sl
}
// StdioListener wraps a *StdioConn to implement net.Listener.
type StdioListener struct {
ready chan *StdioConn
conn *StdioConn
}
func (sl *StdioListener) Accept() (net.Conn, error) {
if sl.conn.isClosed() {
return nil, errors.New("accept on closed conn")
}
return <-sl.ready, nil
}
func (sl *StdioListener) Addr() net.Addr {
return sl.conn.LocalAddr()
}
func (sl *StdioListener) Close() error {
if sl.conn.isClosed() {
return nil
}
go func() {
sl.ready <- sl.conn
}()
return nil
}