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/
stdcopy_test.go
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/
stdcopy_test.go
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// Copyright 2014 go-dockerclient authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the DOCKER-LICENSE file.
package rudder
import (
"bytes"
"encoding/binary"
"errors"
"io"
"strings"
"testing"
"testing/iotest"
)
type errorWriter struct {
}
func (errorWriter) Write([]byte) (int, error) {
return 0, errors.New("something went wrong")
}
func TestStdCopy(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
input.Write([]byte("something happened!"))
input.Write([]byte{1, 0, 0, 0, 0, 0, 0, 12})
input.Write([]byte("just kidding"))
input.Write([]byte{0, 0, 0, 0, 0, 0, 0, 6})
input.Write([]byte("\nyeah!"))
n, err := stdCopy(&stdout, &stderr, &input)
if err != nil {
t.Fatal(err)
}
if expected := int64(19 + 12 + 6); n != expected {
t.Errorf("Wrong number of bytes. Want %d. Got %d.", expected, n)
}
if got := stderr.String(); got != "something happened!" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "something happened!", got)
}
if got := stdout.String(); got != "just kidding\nyeah!" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "just kidding\nyeah!", got)
}
}
func TestStdCopyStress(t *testing.T) {
var input, stdout, stderr bytes.Buffer
value := strings.Repeat("something ", 4096)
writer := newStdWriter(&input, Stdout)
writer.Write([]byte(value))
n, err := stdCopy(&stdout, &stderr, &input)
if err != nil {
t.Fatal(err)
}
if n != 40960 {
t.Errorf("Wrong number of bytes. Want 40960. Got %d.", n)
}
if got := stderr.String(); got != "" {
t.Errorf("stdCopy: wrong stderr. Want empty string. Got %q", got)
}
if got := stdout.String(); got != value {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q", value, got)
}
}
func TestStdCopyInvalidStdHeader(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{3, 0, 0, 0, 0, 0, 0, 19})
n, err := stdCopy(&stdout, &stderr, &input)
if n != 0 {
t.Errorf("stdCopy: wrong number of bytes. Want 0. Got %d", n)
}
if err != errInvalidStdHeader {
t.Errorf("stdCopy: wrong error. Want ErrInvalidStdHeader. Got %#v", err)
}
}
func TestStdCopyBigFrame(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 18})
input.Write([]byte("something happened!"))
n, err := stdCopy(&stdout, &stderr, &input)
if err != nil {
t.Fatal(err)
}
if expected := int64(18); n != expected {
t.Errorf("Wrong number of bytes. Want %d. Got %d.", expected, n)
}
if got := stderr.String(); got != "something happened" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "something happened", got)
}
if got := stdout.String(); got != "" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "", got)
}
}
func TestStdCopySmallFrame(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 20})
input.Write([]byte("something happened!"))
n, err := stdCopy(&stdout, &stderr, &input)
if err != io.ErrShortWrite {
t.Errorf("stdCopy: wrong error. Want ShortWrite. Got %#v", err)
}
if expected := int64(19); n != expected {
t.Errorf("Wrong number of bytes. Want %d. Got %d.", expected, n)
}
if got := stderr.String(); got != "something happened!" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "something happened", got)
}
if got := stdout.String(); got != "" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "", got)
}
}
func TestStdCopyEmpty(t *testing.T) {
var input, stdout, stderr bytes.Buffer
n, err := stdCopy(&stdout, &stderr, &input)
if err != nil {
t.Fatal(err)
}
if n != 0 {
t.Errorf("stdCopy: wrong number of bytes. Want 0. Got %d.", n)
}
}
func TestStdCopyCorruptedHeader(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0})
n, err := stdCopy(&stdout, &stderr, &input)
if err != nil {
t.Fatal(err)
}
if n != 0 {
t.Errorf("stdCopy: wrong number of bytes. Want 0. Got %d.", n)
}
}
func TestStdCopyTruncateWriter(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
input.Write([]byte("something happened!"))
n, err := stdCopy(&stdout, iotest.TruncateWriter(&stderr, 7), &input)
if err != nil {
t.Fatal(err)
}
if expected := int64(19); n != expected {
t.Errorf("Wrong number of bytes. Want %d. Got %d.", expected, n)
}
if got := stderr.String(); got != "somethi" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "somethi", got)
}
if got := stdout.String(); got != "" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "", got)
}
}
func TestStdCopyHeaderOnly(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
n, err := stdCopy(&stdout, iotest.TruncateWriter(&stderr, 7), &input)
if err != io.ErrShortWrite {
t.Errorf("stdCopy: wrong error. Want ShortWrite. Got %#v", err)
}
if n != 0 {
t.Errorf("Wrong number of bytes. Want 0. Got %d.", n)
}
if got := stderr.String(); got != "" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "", got)
}
if got := stdout.String(); got != "" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "", got)
}
}
func TestStdCopyDataErrReader(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
input.Write([]byte("something happened!"))
n, err := stdCopy(&stdout, &stderr, iotest.DataErrReader(&input))
if err != nil {
t.Fatal(err)
}
if expected := int64(19); n != expected {
t.Errorf("Wrong number of bytes. Want %d. Got %d.", expected, n)
}
if got := stderr.String(); got != "something happened!" {
t.Errorf("stdCopy: wrong stderr. Want %q. Got %q.", "something happened!", got)
}
if got := stdout.String(); got != "" {
t.Errorf("stdCopy: wrong stdout. Want %q. Got %q.", "", got)
}
}
func TestStdCopyTimeoutReader(t *testing.T) {
var input, stdout, stderr bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
input.Write([]byte("something happened!"))
_, err := stdCopy(&stdout, &stderr, iotest.TimeoutReader(&input))
if err != iotest.ErrTimeout {
t.Errorf("stdCopy: wrong error. Want ErrTimeout. Got %#v.", err)
}
}
func TestStdCopyWriteError(t *testing.T) {
var input bytes.Buffer
input.Write([]byte{2, 0, 0, 0, 0, 0, 0, 19})
input.Write([]byte("something happened!"))
var stdout, stderr errorWriter
n, err := stdCopy(stdout, stderr, &input)
if err.Error() != "something went wrong" {
t.Errorf("stdCopy: wrong error. Want %q. Got %q", "something went wrong", err)
}
if n != 0 {
t.Errorf("stdCopy: wrong number of bytes. Want 0. Got %d.", n)
}
}
type StdType [8]byte
var (
Stdin = StdType{0: 0}
Stdout = StdType{0: 1}
Stderr = StdType{0: 2}
)
type StdWriter struct {
io.Writer
prefix StdType
sizeBuf []byte
}
func (w *StdWriter) Write(buf []byte) (n int, err error) {
if w == nil || w.Writer == nil {
return 0, errors.New("Writer not instanciated")
}
binary.BigEndian.PutUint32(w.prefix[4:], uint32(len(buf)))
buf = append(w.prefix[:], buf...)
n, err = w.Writer.Write(buf)
return n - 8, err
}
func newStdWriter(w io.Writer, t StdType) *StdWriter {
if len(t) != 8 {
return nil
}
return &StdWriter{
Writer: w,
prefix: t,
sizeBuf: make([]byte, 4),
}
}