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Copy pathpipe_test.go
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302 lines (276 loc) · 5.79 KB
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package io_test
import (
"fmt"
. "io"
"testing"
"time"
)
func checkWrite(t *testing.T, w Writer, data []byte, c chan int) {
n, err := w.Write(data)
if err != nil {
t.Errorf("write: %v", err)
}
if n != len(data) {
t.Errorf("short write: %d != %d", n, len(data))
}
c <- 0
}
// Test a single read/write pair.
func TestPipe1(t *testing.T) {
c := make(chan int)
r, w := Pipe()
var buf = make([]byte, 64)
go checkWrite(t, w, []byte("hello, world"), c)
n, err := r.Read(buf)
if err != nil {
t.Errorf("read: %v", err)
} else if n != 12 || string(buf[0:12]) != "hello, world" {
t.Errorf("bad read: got %q", buf[0:n])
}
<-c
r.Close()
w.Close()
}
func reader(t *testing.T, r Reader, c chan int) {
var buf = make([]byte, 64)
for {
n, err := r.Read(buf)
if err == EOF {
c <- 0
break
}
if err != nil {
t.Errorf("read: %v", err)
}
c <- n
}
}
// Test a sequence of read/write pairs.
func TestPipe2(t *testing.T) {
c := make(chan int)
r, w := Pipe()
go reader(t, r, c)
var buf = make([]byte, 64)
for i := 0; i < 5; i++ {
p := buf[0 : 5+i*10]
n, err := w.Write(p)
if n != len(p) {
t.Errorf("wrote %d, got %d", len(p), n)
}
if err != nil {
t.Errorf("write: %v", err)
}
nn := <-c
if nn != n {
t.Errorf("wrote %d, read got %d", n, nn)
}
}
w.Close()
nn := <-c
if nn != 0 {
t.Errorf("final read got %d", nn)
}
}
type pipeReturn struct {
n int
err error
}
// Test a large write that requires multiple reads to satisfy.
func writer(w WriteCloser, buf []byte, c chan pipeReturn) {
n, err := w.Write(buf)
w.Close()
c <- pipeReturn{n, err}
}
func TestPipe3(t *testing.T) {
c := make(chan pipeReturn)
r, w := Pipe()
var wdat = make([]byte, 128)
for i := 0; i < len(wdat); i++ {
wdat[i] = byte(i)
}
go writer(w, wdat, c)
var rdat = make([]byte, 1024)
tot := 0
for n := 1; n <= 256; n *= 2 {
nn, err := r.Read(rdat[tot : tot+n])
if err != nil && err != EOF {
t.Fatalf("read: %v", err)
}
// only final two reads should be short - 1 byte, then 0
expect := n
if n == 128 {
expect = 1
} else if n == 256 {
expect = 0
if err != EOF {
t.Fatalf("read at end: %v", err)
}
}
if nn != expect {
t.Fatalf("read %d, expected %d, got %d", n, expect, nn)
}
tot += nn
}
pr := <-c
if pr.n != 128 || pr.err != nil {
t.Fatalf("write 128: %d, %v", pr.n, pr.err)
}
if tot != 128 {
t.Fatalf("total read %d != 128", tot)
}
for i := 0; i < 128; i++ {
if rdat[i] != byte(i) {
t.Fatalf("rdat[%d] = %d", i, rdat[i])
}
}
}
// Test read after/before writer close.
type closer interface {
CloseWithError(error) error
Close() error
}
type pipeTest struct {
async bool
err error
closeWithError bool
}
func (p pipeTest) String() string {
return fmt.Sprintf("async=%v err=%v closeWithError=%v", p.async, p.err, p.closeWithError)
}
var pipeTests = []pipeTest{
{true, nil, false},
{true, nil, true},
{true, ErrShortWrite, true},
{false, nil, false},
{false, nil, true},
{false, ErrShortWrite, true},
}
func delayClose(t *testing.T, cl closer, ch chan int, tt pipeTest) {
time.Sleep(1 * time.Millisecond)
var err error
if tt.closeWithError {
err = cl.CloseWithError(tt.err)
} else {
err = cl.Close()
}
if err != nil {
t.Errorf("delayClose: %v", err)
}
ch <- 0
}
func TestPipeReadClose(t *testing.T) {
for _, tt := range pipeTests {
c := make(chan int, 1)
r, w := Pipe()
if tt.async {
go delayClose(t, w, c, tt)
} else {
delayClose(t, w, c, tt)
}
var buf = make([]byte, 64)
n, err := r.Read(buf)
<-c
want := tt.err
if want == nil {
want = EOF
}
if err != want {
t.Errorf("read from closed pipe: %v want %v", err, want)
}
if n != 0 {
t.Errorf("read on closed pipe returned %d", n)
}
if err = r.Close(); err != nil {
t.Errorf("r.Close: %v", err)
}
}
}
// Test close on Read side during Read.
func TestPipeReadClose2(t *testing.T) {
c := make(chan int, 1)
r, _ := Pipe()
go delayClose(t, r, c, pipeTest{})
n, err := r.Read(make([]byte, 64))
<-c
if n != 0 || err != ErrClosedPipe {
t.Errorf("read from closed pipe: %v, %v want %v, %v", n, err, 0, ErrClosedPipe)
}
}
// Test write after/before reader close.
func TestPipeWriteClose(t *testing.T) {
for _, tt := range pipeTests {
c := make(chan int, 1)
r, w := Pipe()
if tt.async {
go delayClose(t, r, c, tt)
} else {
delayClose(t, r, c, tt)
}
n, err := WriteString(w, "hello, world")
<-c
expect := tt.err
if expect == nil {
expect = ErrClosedPipe
}
if err != expect {
t.Errorf("write on closed pipe: %v want %v", err, expect)
}
if n != 0 {
t.Errorf("write on closed pipe returned %d", n)
}
if err = w.Close(); err != nil {
t.Errorf("w.Close: %v", err)
}
}
}
func TestWriteEmpty(t *testing.T) {
r, w := Pipe()
go func() {
w.Write([]byte{})
w.Close()
}()
var b [2]byte
ReadFull(r, b[0:2])
r.Close()
}
func TestWriteNil(t *testing.T) {
r, w := Pipe()
go func() {
w.Write(nil)
w.Close()
}()
var b [2]byte
ReadFull(r, b[0:2])
r.Close()
}
func TestWriteAfterWriterClose(t *testing.T) {
r, w := Pipe()
done := make(chan bool)
var writeErr error
go func() {
_, err := w.Write([]byte("hello"))
if err != nil {
t.Errorf("got error: %q; expected none", err)
}
w.Close()
_, writeErr = w.Write([]byte("world"))
done <- true
}()
buf := make([]byte, 100)
var result string
n, err := ReadFull(r, buf)
if err != nil && err != ErrUnexpectedEOF {
t.Fatalf("got: %q; want: %q", err, ErrUnexpectedEOF)
}
result = string(buf[0:n])
<-done
if result != "hello" {
t.Errorf("got: %q; want: %q", result, "hello")
}
if writeErr != ErrClosedPipe {
t.Errorf("got: %q; want: %q", writeErr, ErrClosedPipe)
}
}