io.Pipe

assorted underscore cleanup

R=r
DELTA=488  (410 added, 3 deleted, 75 changed)
OCL=25070
CL=25070

src/lib/io/pipe_test.go

@@ -0,0 +1,203 @@
+// 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
+
+import (
+	"io";
+	"os";
+	"testing";
+	"time";
+)
+
+func checkWrite(t *testing.T, w io.Write, 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 := io.Pipe();
+	var buf [64]byte;
+	go checkWrite(t, w, io.StringBytes("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 io.Read, c chan int) {
+	var buf [64]byte;
+	for {
+		n, err := r.Read(buf);
+		if err != nil {
+			t.Errorf("read: %v", err);
+		}
+		c <- n;
+		if n == 0 {
+			break;
+		}
+	}
+}
+
+// Test a sequence of read/write pairs.
+func TestPipe2(t *testing.T) {
+	c := make(chan int);
+	r, w := io.Pipe();
+	go reader(t, r, c);
+	var buf [64]byte;
+	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);
+	}
+}
+
+// Test a large write that requires multiple reads to satisfy.
+func writer(w io.WriteClose, 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 := io.Pipe();
+	var wdat [128]byte;
+	for i := 0; i < len(wdat); i++ {
+		wdat[i] = byte(i);
+	}
+	go writer(w, wdat, c);
+	var rdat [1024]byte;
+	tot := 0;
+	for n := 1; n <= 256; n *= 2 {
+		nn, err := r.Read(rdat[tot:tot+n]);
+		if err != nil {
+			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 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.
+
+func delayClose(t *testing.T, cl io.Close, ch chan int) {
+	time.Sleep(1000*1000);	// 1 ms
+	if err := cl.Close(); err != nil {
+		t.Errorf("delayClose: %v", err);
+	}
+	ch <- 0;
+}
+
+func testPipeReadClose(t *testing.T, async bool) {
+	c := make(chan int, 1);
+	r, w := io.Pipe();
+	if async {
+		go delayClose(t, w, c);
+	} else {
+		delayClose(t, w, c);
+	}
+	var buf [64]int;
+	n, err := r.Read(buf);
+	<-c;
+	if err != nil {
+		t.Errorf("read from closed pipe: %v", err);
+	}
+	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 write after/before reader close.
+
+func testPipeWriteClose(t *testing.T, async bool) {
+	c := make(chan int, 1);
+	r, w := io.Pipe();
+	if async {
+		go delayClose(t, r, c);
+	} else {
+		delayClose(t, r, c);
+	}
+	n, err := io.WriteString(w, "hello, world");
+	<-c;
+	if err != os.EPIPE {
+		t.Errorf("write on closed pipe: %v", err);
+	}
+	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 TestPipeReadCloseAsync(t *testing.T) {
+	testPipeReadClose(t, true);
+}
+
+func TestPipeReadCloseSync(t *testing.T) {
+	testPipeReadClose(t, false);
+}
+
+func TestPipeWriteCloseAsync(t *testing.T) {
+	testPipeWriteClose(t, true);
+}
+
+func TestPipeWriteCloseSync(t *testing.T) {
+	testPipeWriteClose(t, false);
+}
+