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package nio
import (
"bufio"
"bytes"
"errors"
"io"
"testing"
"io/ioutil"
"time"
"github.com/djherbis/buffer"
)
func TestCopy(t *testing.T) {
buf := buffer.New(1024)
input := bytes.NewBuffer(nil)
output := bytes.NewBuffer(nil)
input.Write([]byte("hello world"))
n, err := Copy(output, input, buf)
if err != nil {
t.Errorf(err.Error())
}
if int(n) != len("hello world") {
t.Errorf("wrote wrong # of bytes")
}
if !bytes.Equal(output.Bytes(), []byte("hello world")) {
t.Errorf("output didn't match: %s", output.Bytes())
}
}
func TestBigWriteSmallBuf(t *testing.T) {
buf := buffer.New(5)
r, w := Pipe(buf)
defer r.Close()
go func() {
defer w.Close()
n, err := w.Write([]byte("hello world"))
if err != nil {
t.Error(err.Error())
}
if int(n) != len("hello world") {
t.Errorf("wrote wrong # of bytes")
}
}()
output := bytes.NewBuffer(nil)
_, err := io.Copy(output, r)
if err != nil {
t.Error(err.Error())
}
if !bytes.Equal(output.Bytes(), []byte("hello world")) {
t.Errorf("unexpected output %s", output.Bytes())
}
}
func TestPipeCloseEarly(t *testing.T) {
buf := buffer.New(1024)
r, w := Pipe(buf)
r.Close()
_, err := w.Write([]byte("hello world"))
if err != io.ErrClosedPipe {
t.Errorf("expected closed pipe")
}
_, err = io.Copy(ioutil.Discard, r)
if err != io.ErrClosedPipe {
t.Errorf("expected closed pipe")
}
}
func TestPipe(t *testing.T) {
buf := buffer.New(1024)
r, w := Pipe(buf)
defer r.Close()
data := []byte("the quick brown fox jumps over the lazy dog")
if _, err := w.Write(data); err != nil {
t.Error(err.Error())
return
}
w.Close()
result := make([]byte, 1024)
n, err := r.Read(result)
if err != nil && err != io.EOF {
t.Error(err.Error())
return
}
result = result[:n]
if !bytes.Equal(data, result) {
t.Errorf("exp [%s]\ngot[%s]", string(data), string(result))
}
}
func TestEarlyCloseWrite(t *testing.T) {
buf := buffer.New(1)
r, w := Pipe(buf)
testerr := errors.New("test err")
w.CloseWithError(testerr)
_, err := w.Write([]byte("ab")) // too big for buffer
if err != io.ErrClosedPipe {
t.Errorf("expected %s but got %s.", testerr, err)
}
_, err = io.Copy(ioutil.Discard, r)
if err != testerr {
t.Errorf("expected %s but got %s.", testerr, err)
}
}
func TestUnblockWrite(t *testing.T) {
buf := buffer.New(1)
r, w := Pipe(buf)
testerr := errors.New("test err")
go func() {
<-time.After(100 * time.Millisecond)
if er := w.CloseWithError(testerr); er != nil {
t.Error(er)
}
}()
_, err := w.Write([]byte("ab")) // too big for buffer
if err != io.ErrClosedPipe {
t.Errorf("expected %s but got %s.", testerr, err)
}
_, err = io.Copy(ioutil.Discard, r)
if err != testerr {
t.Errorf("expected %s but got %s.", testerr, err)
}
}
type badBuffer struct{}
func (badBuffer) Len() int64 { return 3 }
func (badBuffer) Cap() int64 { return 6 }
func (badBuffer) Write(p []byte) (int, error) { return len(p), nil }
func (badBuffer) Read(p []byte) (int, error) { return 0, io.EOF }
func TestEmpty(t *testing.T) {
r, w := Pipe(badBuffer{})
n, err := w.Write([]byte("any"))
if err != nil {
t.Error(err)
}
if n != 3 {
t.Errorf("wrote wrong # of bytes %d", n)
}
n, err = r.Read(nil)
if err != nil {
t.Error(err)
}
if n != 0 {
t.Errorf("wrote wrong # of bytes %d", n)
}
}
func BenchmarkPipe(b *testing.B) {
r, w := Pipe(buffer.New(1024))
benchPipe(r, w, b)
}
func BenchmarkIOPipe(b *testing.B) {
r, w := io.Pipe()
benchPipe(r, w, b)
}
func benchPipe(r io.Reader, w io.WriteCloser, b *testing.B) {
b.ReportAllocs()
f, err := ioutil.TempFile("", "benchPipe")
if err != nil {
b.Error(err)
}
go func() {
defer f.Close()
io.Copy(bufio.NewWriter(f), r)
}()
defer w.Close()
for i := 0; i < b.N; i++ {
w.Write([]byte("hello world"))
}
}
|
