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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 net
import (
"fmt"
"io"
"io/ioutil"
"runtime"
"testing"
"time"
)
func isTimeout(err error) bool {
e, ok := err.(Error)
return ok && e.Timeout()
}
type copyRes struct {
n int64
err error
d time.Duration
}
func TestAcceptTimeout(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t).(*TCPListener)
defer ln.Close()
ln.SetDeadline(time.Now().Add(-1 * time.Second))
if _, err := ln.Accept(); !isTimeout(err) {
t.Fatalf("Accept: expected err %v, got %v", errTimeout, err)
}
if _, err := ln.Accept(); !isTimeout(err) {
t.Fatalf("Accept: expected err %v, got %v", errTimeout, err)
}
ln.SetDeadline(time.Now().Add(100 * time.Millisecond))
if _, err := ln.Accept(); !isTimeout(err) {
t.Fatalf("Accept: expected err %v, got %v", errTimeout, err)
}
if _, err := ln.Accept(); !isTimeout(err) {
t.Fatalf("Accept: expected err %v, got %v", errTimeout, err)
}
ln.SetDeadline(noDeadline)
errc := make(chan error)
go func() {
_, err := ln.Accept()
errc <- err
}()
time.Sleep(100 * time.Millisecond)
select {
case err := <-errc:
t.Fatalf("Expected Accept() to not return, but it returned with %v\n", err)
default:
}
ln.Close()
switch nerr := <-errc; err := nerr.(type) {
case *OpError:
if err.Err != errClosing {
t.Fatalf("Accept: expected err %v, got %v", errClosing, err)
}
default:
if err != errClosing {
t.Fatalf("Accept: expected err %v, got %v", errClosing, err)
}
}
}
func TestReadTimeout(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
c, err := DialTCP("tcp", nil, ln.Addr().(*TCPAddr))
if err != nil {
t.Fatalf("Connect: %v", err)
}
defer c.Close()
c.SetDeadline(time.Now().Add(time.Hour))
c.SetReadDeadline(time.Now().Add(-1 * time.Second))
buf := make([]byte, 1)
if _, err = c.Read(buf); !isTimeout(err) {
t.Fatalf("Read: expected err %v, got %v", errTimeout, err)
}
if _, err = c.Read(buf); !isTimeout(err) {
t.Fatalf("Read: expected err %v, got %v", errTimeout, err)
}
c.SetDeadline(time.Now().Add(100 * time.Millisecond))
if _, err = c.Read(buf); !isTimeout(err) {
t.Fatalf("Read: expected err %v, got %v", errTimeout, err)
}
if _, err = c.Read(buf); !isTimeout(err) {
t.Fatalf("Read: expected err %v, got %v", errTimeout, err)
}
c.SetReadDeadline(noDeadline)
c.SetWriteDeadline(time.Now().Add(-1 * time.Second))
errc := make(chan error)
go func() {
_, err := c.Read(buf)
errc <- err
}()
time.Sleep(100 * time.Millisecond)
select {
case err := <-errc:
t.Fatalf("Expected Read() to not return, but it returned with %v\n", err)
default:
}
c.Close()
switch nerr := <-errc; err := nerr.(type) {
case *OpError:
if err.Err != errClosing {
t.Fatalf("Read: expected err %v, got %v", errClosing, err)
}
default:
if err == io.EOF && runtime.GOOS == "nacl" { // close enough; golang.org/issue/8044
break
}
if err != errClosing {
t.Fatalf("Read: expected err %v, got %v", errClosing, err)
}
}
}
func TestWriteTimeout(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
c, err := DialTCP("tcp", nil, ln.Addr().(*TCPAddr))
if err != nil {
t.Fatalf("Connect: %v", err)
}
defer c.Close()
c.SetDeadline(time.Now().Add(time.Hour))
c.SetWriteDeadline(time.Now().Add(-1 * time.Second))
buf := make([]byte, 4096)
writeUntilTimeout := func() {
for {
_, err := c.Write(buf)
if err != nil {
if isTimeout(err) {
return
}
t.Fatalf("Write: expected err %v, got %v", errTimeout, err)
}
}
}
writeUntilTimeout()
c.SetDeadline(time.Now().Add(10 * time.Millisecond))
writeUntilTimeout()
writeUntilTimeout()
c.SetWriteDeadline(noDeadline)
c.SetReadDeadline(time.Now().Add(-1 * time.Second))
errc := make(chan error)
go func() {
for {
_, err := c.Write(buf)
if err != nil {
errc <- err
}
}
}()
time.Sleep(100 * time.Millisecond)
select {
case err := <-errc:
t.Fatalf("Expected Write() to not return, but it returned with %v\n", err)
default:
}
c.Close()
switch nerr := <-errc; err := nerr.(type) {
case *OpError:
if err.Err != errClosing {
t.Fatalf("Write: expected err %v, got %v", errClosing, err)
}
default:
if err != errClosing {
t.Fatalf("Write: expected err %v, got %v", errClosing, err)
}
}
}
func testTimeout(t *testing.T, net, addr string, readFrom bool) {
c, err := Dial(net, addr)
if err != nil {
t.Errorf("Dial(%q, %q) failed: %v", net, addr, err)
return
}
defer c.Close()
what := "Read"
if readFrom {
what = "ReadFrom"
}
errc := make(chan error, 1)
go func() {
t0 := time.Now()
c.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
var b [100]byte
var n int
var err error
if readFrom {
n, _, err = c.(PacketConn).ReadFrom(b[0:])
} else {
n, err = c.Read(b[0:])
}
t1 := time.Now()
if n != 0 || err == nil || !err.(Error).Timeout() {
errc <- fmt.Errorf("%s(%q, %q) did not return 0, timeout: %v, %v", what, net, addr, n, err)
return
}
if dt := t1.Sub(t0); dt < 50*time.Millisecond || !testing.Short() && dt > 250*time.Millisecond {
errc <- fmt.Errorf("%s(%q, %q) took %s, expected 0.1s", what, net, addr, dt)
return
}
errc <- nil
}()
select {
case err := <-errc:
if err != nil {
t.Error(err)
}
case <-time.After(1 * time.Second):
t.Errorf("%s(%q, %q) took over 1 second, expected 0.1s", what, net, addr)
}
}
func TestTimeoutUDP(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
// set up a listener that won't talk back
listening := make(chan string)
done := make(chan int)
go runDatagramPacketConnServer(t, "udp", "127.0.0.1:0", listening, done)
addr := <-listening
testTimeout(t, "udp", addr, false)
testTimeout(t, "udp", addr, true)
<-done
}
func TestTimeoutTCP(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
// set up a listener that won't talk back
listening := make(chan string)
done := make(chan int)
go runStreamConnServer(t, "tcp", "127.0.0.1:0", listening, done)
addr := <-listening
testTimeout(t, "tcp", addr, false)
<-done
}
func TestDeadlineReset(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
tl := ln.(*TCPListener)
tl.SetDeadline(time.Now().Add(1 * time.Minute))
tl.SetDeadline(noDeadline) // reset it
errc := make(chan error, 1)
go func() {
_, err := ln.Accept()
errc <- err
}()
select {
case <-time.After(50 * time.Millisecond):
// Pass.
case err := <-errc:
// Accept should never return; we never
// connected to it.
t.Errorf("unexpected return from Accept; err=%v", err)
}
}
func TestTimeoutAccept(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
tl := ln.(*TCPListener)
tl.SetDeadline(time.Now().Add(100 * time.Millisecond))
errc := make(chan error, 1)
go func() {
_, err := ln.Accept()
errc <- err
}()
select {
case <-time.After(1 * time.Second):
// Accept shouldn't block indefinitely
t.Errorf("Accept didn't return in an expected time")
case <-errc:
// Pass.
}
}
func TestReadWriteDeadline(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
const (
readTimeout = 50 * time.Millisecond
writeTimeout = 250 * time.Millisecond
)
checkTimeout := func(command string, start time.Time, should time.Duration) {
is := time.Now().Sub(start)
d := is - should
if d < -30*time.Millisecond || !testing.Short() && 150*time.Millisecond < d {
t.Errorf("%s timeout test failed: is=%v should=%v\n", command, is, should)
}
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("ListenTCP on :0: %v", err)
}
defer ln.Close()
lnquit := make(chan bool)
go func() {
c, err := ln.Accept()
if err != nil {
t.Errorf("Accept: %v", err)
return
}
defer c.Close()
lnquit <- true
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("Dial: %v", err)
}
defer c.Close()
start := time.Now()
err = c.SetReadDeadline(start.Add(readTimeout))
if err != nil {
t.Fatalf("SetReadDeadline: %v", err)
}
err = c.SetWriteDeadline(start.Add(writeTimeout))
if err != nil {
t.Fatalf("SetWriteDeadline: %v", err)
}
quit := make(chan bool)
go func() {
var buf [10]byte
_, err := c.Read(buf[:])
if err == nil {
t.Errorf("Read should not succeed")
}
checkTimeout("Read", start, readTimeout)
quit <- true
}()
go func() {
var buf [10000]byte
for {
_, err := c.Write(buf[:])
if err != nil {
break
}
}
checkTimeout("Write", start, writeTimeout)
quit <- true
}()
<-quit
<-quit
<-lnquit
}
type neverEnding byte
func (b neverEnding) Read(p []byte) (n int, err error) {
for i := range p {
p[i] = byte(b)
}
return len(p), nil
}
func TestVariousDeadlines1Proc(t *testing.T) {
testVariousDeadlines(t, 1)
}
func TestVariousDeadlines4Proc(t *testing.T) {
testVariousDeadlines(t, 4)
}
func testVariousDeadlines(t *testing.T, maxProcs int) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(maxProcs))
ln := newLocalListener(t)
defer ln.Close()
acceptc := make(chan error, 1)
// The server, with no timeouts of its own, sending bytes to clients
// as fast as it can.
servec := make(chan copyRes)
go func() {
for {
c, err := ln.Accept()
if err != nil {
acceptc <- err
return
}
go func() {
t0 := time.Now()
n, err := io.Copy(c, neverEnding('a'))
d := time.Since(t0)
c.Close()
servec <- copyRes{n, err, d}
}()
}
}()
for _, timeout := range []time.Duration{
1 * time.Nanosecond,
2 * time.Nanosecond,
5 * time.Nanosecond,
50 * time.Nanosecond,
100 * time.Nanosecond,
200 * time.Nanosecond,
500 * time.Nanosecond,
750 * time.Nanosecond,
1 * time.Microsecond,
5 * time.Microsecond,
25 * time.Microsecond,
250 * time.Microsecond,
500 * time.Microsecond,
1 * time.Millisecond,
5 * time.Millisecond,
100 * time.Millisecond,
250 * time.Millisecond,
500 * time.Millisecond,
1 * time.Second,
} {
numRuns := 3
if testing.Short() {
numRuns = 1
if timeout > 500*time.Microsecond {
continue
}
}
for run := 0; run < numRuns; run++ {
name := fmt.Sprintf("%v run %d/%d", timeout, run+1, numRuns)
t.Log(name)
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("Dial: %v", err)
}
clientc := make(chan copyRes)
go func() {
t0 := time.Now()
c.SetDeadline(t0.Add(timeout))
n, err := io.Copy(ioutil.Discard, c)
d := time.Since(t0)
c.Close()
clientc <- copyRes{n, err, d}
}()
tooLong := 5 * time.Second
select {
case res := <-clientc:
if isTimeout(res.err) {
t.Logf("for %v, good client timeout after %v, reading %d bytes", name, res.d, res.n)
} else {
t.Fatalf("for %v: client Copy = %d, %v (want timeout)", name, res.n, res.err)
}
case <-time.After(tooLong):
t.Fatalf("for %v: timeout (%v) waiting for client to timeout (%v) reading", name, tooLong, timeout)
}
select {
case res := <-servec:
t.Logf("for %v: server in %v wrote %d, %v", name, res.d, res.n, res.err)
case err := <-acceptc:
t.Fatalf("for %v: server Accept = %v", name, err)
case <-time.After(tooLong):
t.Fatalf("for %v, timeout waiting for server to finish writing", name)
}
}
}
}
// TestReadDeadlineDataAvailable tests that read deadlines work, even
// if there's data ready to be read.
func TestReadDeadlineDataAvailable(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
servec := make(chan copyRes)
const msg = "data client shouldn't read, even though it'll be waiting"
go func() {
c, err := ln.Accept()
if err != nil {
t.Errorf("Accept: %v", err)
return
}
defer c.Close()
n, err := c.Write([]byte(msg))
servec <- copyRes{n: int64(n), err: err}
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("Dial: %v", err)
}
defer c.Close()
if res := <-servec; res.err != nil || res.n != int64(len(msg)) {
t.Fatalf("unexpected server Write: n=%d, err=%v; want n=%d, err=nil", res.n, res.err, len(msg))
}
c.SetReadDeadline(time.Now().Add(-5 * time.Second)) // in the psat.
buf := make([]byte, len(msg)/2)
n, err := c.Read(buf)
if n > 0 || !isTimeout(err) {
t.Fatalf("client read = %d (%q) err=%v; want 0, timeout", n, buf[:n], err)
}
}
// TestWriteDeadlineBufferAvailable tests that write deadlines work, even
// if there's buffer space available to write.
func TestWriteDeadlineBufferAvailable(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
servec := make(chan copyRes)
go func() {
c, err := ln.Accept()
if err != nil {
t.Errorf("Accept: %v", err)
return
}
defer c.Close()
c.SetWriteDeadline(time.Now().Add(-5 * time.Second)) // in the past
n, err := c.Write([]byte{'x'})
servec <- copyRes{n: int64(n), err: err}
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("Dial: %v", err)
}
defer c.Close()
res := <-servec
if res.n != 0 {
t.Errorf("Write = %d; want 0", res.n)
}
if !isTimeout(res.err) {
t.Errorf("Write error = %v; want timeout", res.err)
}
}
// TestAcceptDeadlineConnectionAvailable tests that accept deadlines work, even
// if there's incoming connections available.
func TestAcceptDeadlineConnectionAvailable(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t).(*TCPListener)
defer ln.Close()
go func() {
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Errorf("Dial: %v", err)
return
}
defer c.Close()
var buf [1]byte
c.Read(buf[:]) // block until the connection or listener is closed
}()
time.Sleep(10 * time.Millisecond)
ln.SetDeadline(time.Now().Add(-5 * time.Second)) // in the past
c, err := ln.Accept()
if err == nil {
defer c.Close()
}
if !isTimeout(err) {
t.Fatalf("Accept: got %v; want timeout", err)
}
}
// TestConnectDeadlineInThePast tests that connect deadlines work, even
// if the connection can be established w/o blocking.
func TestConnectDeadlineInThePast(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t).(*TCPListener)
defer ln.Close()
go func() {
c, err := ln.Accept()
if err == nil {
defer c.Close()
}
}()
time.Sleep(10 * time.Millisecond)
c, err := DialTimeout("tcp", ln.Addr().String(), -5*time.Second) // in the past
if err == nil {
defer c.Close()
}
if !isTimeout(err) {
t.Fatalf("DialTimeout: got %v; want timeout", err)
}
}
// TestProlongTimeout tests concurrent deadline modification.
// Known to cause data races in the past.
func TestProlongTimeout(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
connected := make(chan bool)
go func() {
s, err := ln.Accept()
connected <- true
if err != nil {
t.Errorf("ln.Accept: %v", err)
return
}
defer s.Close()
s.SetDeadline(time.Now().Add(time.Hour))
go func() {
var buf [4096]byte
for {
_, err := s.Write(buf[:])
if err != nil {
break
}
s.SetDeadline(time.Now().Add(time.Hour))
}
}()
buf := make([]byte, 1)
for {
_, err := s.Read(buf)
if err != nil {
break
}
s.SetDeadline(time.Now().Add(time.Hour))
}
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("DialTCP: %v", err)
}
defer c.Close()
<-connected
for i := 0; i < 1024; i++ {
var buf [1]byte
c.Write(buf[:])
}
}
func TestDeadlineRace(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
N := 1000
if testing.Short() {
N = 50
}
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
ln := newLocalListener(t)
defer ln.Close()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("Dial: %v", err)
}
defer c.Close()
done := make(chan bool)
go func() {
t := time.NewTicker(2 * time.Microsecond).C
for i := 0; i < N; i++ {
if err := c.SetDeadline(time.Now().Add(2 * time.Microsecond)); err != nil {
break
}
<-t
}
done <- true
}()
var buf [1]byte
for i := 0; i < N; i++ {
c.Read(buf[:]) // ignore possible timeout errors
}
c.Close()
<-done
}