forked from TrueCloudLab/restic
110 lines
2 KiB
Go
110 lines
2 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh
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import (
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"io"
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"sync"
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"testing"
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)
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// An in-memory packetConn. It is safe to call Close and writePacket
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// from different goroutines.
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type memTransport struct {
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eof bool
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pending [][]byte
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write *memTransport
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sync.Mutex
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*sync.Cond
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}
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func (t *memTransport) readPacket() ([]byte, error) {
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t.Lock()
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defer t.Unlock()
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for {
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if len(t.pending) > 0 {
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r := t.pending[0]
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t.pending = t.pending[1:]
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return r, nil
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}
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if t.eof {
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return nil, io.EOF
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}
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t.Cond.Wait()
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}
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}
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func (t *memTransport) closeSelf() error {
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t.Lock()
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defer t.Unlock()
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if t.eof {
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return io.EOF
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}
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t.eof = true
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t.Cond.Broadcast()
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return nil
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}
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func (t *memTransport) Close() error {
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err := t.write.closeSelf()
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t.closeSelf()
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return err
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}
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func (t *memTransport) writePacket(p []byte) error {
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t.write.Lock()
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defer t.write.Unlock()
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if t.write.eof {
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return io.EOF
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}
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c := make([]byte, len(p))
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copy(c, p)
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t.write.pending = append(t.write.pending, c)
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t.write.Cond.Signal()
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return nil
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}
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func memPipe() (a, b packetConn) {
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t1 := memTransport{}
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t2 := memTransport{}
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t1.write = &t2
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t2.write = &t1
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t1.Cond = sync.NewCond(&t1.Mutex)
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t2.Cond = sync.NewCond(&t2.Mutex)
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return &t1, &t2
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}
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func TestMemPipe(t *testing.T) {
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a, b := memPipe()
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if err := a.writePacket([]byte{42}); err != nil {
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t.Fatalf("writePacket: %v", err)
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}
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if err := a.Close(); err != nil {
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t.Fatal("Close: ", err)
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}
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p, err := b.readPacket()
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if err != nil {
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t.Fatal("readPacket: ", err)
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}
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if len(p) != 1 || p[0] != 42 {
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t.Fatalf("got %v, want {42}", p)
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}
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p, err = b.readPacket()
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if err != io.EOF {
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t.Fatalf("got %v, %v, want EOF", p, err)
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}
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}
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func TestDoubleClose(t *testing.T) {
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a, _ := memPipe()
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err := a.Close()
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if err != nil {
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t.Errorf("Close: %v", err)
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}
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err = a.Close()
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if err != io.EOF {
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t.Errorf("expect EOF on double close.")
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}
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}
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