mirror of
https://github.com/golang/go
synced 2024-10-05 18:31:28 -06:00
c8b47c6fce
io.Read->io.Reader io.Write,Close,etc.->io.Writer,Closer etc. R=rsc DELTA=190 (0 added, 0 deleted, 190 changed) OCL=28525 CL=28535
204 lines
3.9 KiB
Go
204 lines
3.9 KiB
Go
// Copyright 2009 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 io
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import (
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"io";
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"os";
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"testing";
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"time";
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)
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func checkWrite(t *testing.T, w Writer, data []byte, c chan int) {
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n, err := w.Write(data);
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if err != nil {
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t.Errorf("write: %v", err);
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}
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if n != len(data) {
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t.Errorf("short write: %d != %d", n, len(data));
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}
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c <- 0;
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}
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// Test a single read/write pair.
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func TestPipe1(t *testing.T) {
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c := make(chan int);
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r, w := Pipe();
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var buf = make([]byte, 64);
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go checkWrite(t, w, StringBytes("hello, world"), c);
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n, err := r.Read(buf);
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if err != nil {
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t.Errorf("read: %v", err);
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}
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else if n != 12 || string(buf[0:12]) != "hello, world" {
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t.Errorf("bad read: got %q", buf[0:n]);
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}
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<-c;
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r.Close();
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w.Close();
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}
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func reader(t *testing.T, r Reader, c chan int) {
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var buf = make([]byte, 64);
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for {
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n, err := r.Read(buf);
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if err != nil {
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t.Errorf("read: %v", err);
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}
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c <- n;
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if n == 0 {
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break;
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}
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}
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}
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// Test a sequence of read/write pairs.
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func TestPipe2(t *testing.T) {
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c := make(chan int);
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r, w := Pipe();
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go reader(t, r, c);
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var buf = make([]byte, 64);
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for i := 0; i < 5; i++ {
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p := buf[0:5+i*10];
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n, err := w.Write(p);
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if n != len(p) {
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t.Errorf("wrote %d, got %d", len(p), n);
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}
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if err != nil {
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t.Errorf("write: %v", err);
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}
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nn := <-c;
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if nn != n {
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t.Errorf("wrote %d, read got %d", n, nn);
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}
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}
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w.Close();
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nn := <-c;
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if nn != 0 {
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t.Errorf("final read got %d", nn);
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}
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}
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// Test a large write that requires multiple reads to satisfy.
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func writer(w WriteCloser, buf []byte, c chan pipeReturn) {
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n, err := w.Write(buf);
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w.Close();
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c <- pipeReturn{n, err};
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}
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func TestPipe3(t *testing.T) {
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c := make(chan pipeReturn);
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r, w := Pipe();
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var wdat = make([]byte, 128);
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for i := 0; i < len(wdat); i++ {
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wdat[i] = byte(i);
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}
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go writer(w, wdat, c);
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var rdat = make([]byte, 1024);
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tot := 0;
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for n := 1; n <= 256; n *= 2 {
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nn, err := r.Read(rdat[tot:tot+n]);
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if err != nil {
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t.Fatalf("read: %v", err);
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}
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// only final two reads should be short - 1 byte, then 0
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expect := n;
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if n == 128 {
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expect = 1;
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} else if n == 256 {
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expect = 0;
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}
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if nn != expect {
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t.Fatalf("read %d, expected %d, got %d", n, expect, nn);
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}
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tot += nn;
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}
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pr := <-c;
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if pr.n != 128 || pr.err != nil {
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t.Fatalf("write 128: %d, %v", pr.n, pr.err);
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}
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if tot != 128 {
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t.Fatalf("total read %d != 128", tot);
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}
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for i := 0; i < 128; i++ {
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if rdat[i] != byte(i) {
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t.Fatalf("rdat[%d] = %d", i, rdat[i]);
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}
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}
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}
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// Test read after/before writer close.
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func delayClose(t *testing.T, cl Closer, ch chan int) {
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time.Sleep(1000*1000); // 1 ms
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if err := cl.Close(); err != nil {
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t.Errorf("delayClose: %v", err);
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}
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ch <- 0;
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}
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func testPipeReadClose(t *testing.T, async bool) {
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c := make(chan int, 1);
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r, w := Pipe();
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if async {
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go delayClose(t, w, c);
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} else {
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delayClose(t, w, c);
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}
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var buf = make([]byte, 64);
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n, err := r.Read(buf);
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<-c;
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if err != nil {
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t.Errorf("read from closed pipe: %v", err);
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}
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if n != 0 {
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t.Errorf("read on closed pipe returned %d", n);
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}
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if err = r.Close(); err != nil {
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t.Errorf("r.Close: %v", err);
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}
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}
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// Test write after/before reader close.
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func testPipeWriteClose(t *testing.T, async bool) {
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c := make(chan int, 1);
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r, w := Pipe();
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if async {
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go delayClose(t, r, c);
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} else {
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delayClose(t, r, c);
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}
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n, err := WriteString(w, "hello, world");
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<-c;
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if err != os.EPIPE {
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t.Errorf("write on closed pipe: %v", err);
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}
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if n != 0 {
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t.Errorf("write on closed pipe returned %d", n);
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}
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if err = w.Close(); err != nil {
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t.Errorf("w.Close: %v", err);
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}
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}
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func TestPipeReadCloseAsync(t *testing.T) {
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testPipeReadClose(t, true);
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}
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func TestPipeReadCloseSync(t *testing.T) {
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testPipeReadClose(t, false);
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}
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func TestPipeWriteCloseAsync(t *testing.T) {
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testPipeWriteClose(t, true);
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}
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func TestPipeWriteCloseSync(t *testing.T) {
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testPipeWriteClose(t, false);
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}
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