1170 lines
28 KiB
Go
1170 lines
28 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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//go:build !js
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package net
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import (
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"errors"
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"fmt"
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"internal/testenv"
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"io"
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"net/internal/socktest"
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"os"
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"runtime"
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"sync"
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"testing"
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"time"
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)
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var dialTimeoutTests = []struct {
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timeout time.Duration
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delta time.Duration // for deadline
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guard time.Duration
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max time.Duration
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}{
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// Tests that dial timeouts, deadlines in the past work.
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{-5 * time.Second, 0, -5 * time.Second, 100 * time.Millisecond},
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{0, -5 * time.Second, -5 * time.Second, 100 * time.Millisecond},
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{-5 * time.Second, 5 * time.Second, -5 * time.Second, 100 * time.Millisecond}, // timeout over deadline
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{-1 << 63, 0, time.Second, 100 * time.Millisecond},
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{0, -1 << 63, time.Second, 100 * time.Millisecond},
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{50 * time.Millisecond, 0, 100 * time.Millisecond, time.Second},
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{0, 50 * time.Millisecond, 100 * time.Millisecond, time.Second},
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{50 * time.Millisecond, 5 * time.Second, 100 * time.Millisecond, time.Second}, // timeout over deadline
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}
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func TestDialTimeout(t *testing.T) {
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// Cannot use t.Parallel - modifies global hooks.
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origTestHookDialChannel := testHookDialChannel
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defer func() { testHookDialChannel = origTestHookDialChannel }()
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defer sw.Set(socktest.FilterConnect, nil)
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for i, tt := range dialTimeoutTests {
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switch runtime.GOOS {
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case "plan9", "windows":
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testHookDialChannel = func() { time.Sleep(tt.guard) }
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if runtime.GOOS == "plan9" {
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break
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}
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fallthrough
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default:
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sw.Set(socktest.FilterConnect, func(so *socktest.Status) (socktest.AfterFilter, error) {
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time.Sleep(tt.guard)
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return nil, errTimedout
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})
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}
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ch := make(chan error)
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d := Dialer{Timeout: tt.timeout}
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if tt.delta != 0 {
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d.Deadline = time.Now().Add(tt.delta)
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}
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max := time.NewTimer(tt.max)
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defer max.Stop()
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go func() {
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// This dial never starts to send any TCP SYN
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// segment because of above socket filter and
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// test hook.
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c, err := d.Dial("tcp", "127.0.0.1:0")
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if err == nil {
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err = fmt.Errorf("unexpectedly established: tcp:%s->%s", c.LocalAddr(), c.RemoteAddr())
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c.Close()
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}
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ch <- err
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}()
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select {
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case <-max.C:
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t.Fatalf("#%d: Dial didn't return in an expected time", i)
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case err := <-ch:
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if perr := parseDialError(err); perr != nil {
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t.Errorf("#%d: %v", i, perr)
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}
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if nerr, ok := err.(Error); !ok || !nerr.Timeout() {
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t.Fatalf("#%d: %v", i, err)
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}
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}
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}
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}
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func TestDialTimeoutMaxDuration(t *testing.T) {
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ln := newLocalListener(t, "tcp")
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defer func() {
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if err := ln.Close(); err != nil {
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t.Error(err)
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}
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}()
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for _, tt := range []struct {
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timeout time.Duration
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delta time.Duration // for deadline
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}{
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// Large timeouts that will overflow an int64 unix nanos.
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{1<<63 - 1, 0},
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{0, 1<<63 - 1},
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} {
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t.Run(fmt.Sprintf("timeout=%s/delta=%s", tt.timeout, tt.delta), func(t *testing.T) {
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d := Dialer{Timeout: tt.timeout}
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if tt.delta != 0 {
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d.Deadline = time.Now().Add(tt.delta)
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}
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c, err := d.Dial(ln.Addr().Network(), ln.Addr().String())
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if err != nil {
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t.Fatal(err)
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}
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if err := c.Close(); err != nil {
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t.Error(err)
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}
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})
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}
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}
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var acceptTimeoutTests = []struct {
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timeout time.Duration
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xerrs [2]error // expected errors in transition
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}{
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// Tests that accept deadlines in the past work, even if
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// there's incoming connections available.
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{-5 * time.Second, [2]error{os.ErrDeadlineExceeded, os.ErrDeadlineExceeded}},
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{50 * time.Millisecond, [2]error{nil, os.ErrDeadlineExceeded}},
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}
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func TestAcceptTimeout(t *testing.T) {
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testenv.SkipFlaky(t, 17948)
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t.Parallel()
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switch runtime.GOOS {
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case "plan9":
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t.Skipf("not supported on %s", runtime.GOOS)
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}
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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var wg sync.WaitGroup
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for i, tt := range acceptTimeoutTests {
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if tt.timeout < 0 {
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wg.Add(1)
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go func() {
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defer wg.Done()
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d := Dialer{Timeout: 100 * time.Millisecond}
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c, err := d.Dial(ln.Addr().Network(), ln.Addr().String())
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if err != nil {
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t.Error(err)
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return
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}
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c.Close()
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}()
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}
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if err := ln.(*TCPListener).SetDeadline(time.Now().Add(tt.timeout)); err != nil {
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t.Fatalf("$%d: %v", i, err)
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}
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for j, xerr := range tt.xerrs {
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for {
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c, err := ln.Accept()
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if xerr != nil {
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if perr := parseAcceptError(err); perr != nil {
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t.Errorf("#%d/%d: %v", i, j, perr)
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}
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if !isDeadlineExceeded(err) {
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t.Fatalf("#%d/%d: %v", i, j, err)
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}
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}
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if err == nil {
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c.Close()
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time.Sleep(10 * time.Millisecond)
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continue
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}
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break
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}
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}
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}
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wg.Wait()
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}
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func TestAcceptTimeoutMustReturn(t *testing.T) {
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t.Parallel()
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switch runtime.GOOS {
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case "plan9":
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t.Skipf("not supported on %s", runtime.GOOS)
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}
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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max := time.NewTimer(time.Second)
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defer max.Stop()
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ch := make(chan error)
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go func() {
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if err := ln.(*TCPListener).SetDeadline(noDeadline); err != nil {
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t.Error(err)
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}
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if err := ln.(*TCPListener).SetDeadline(time.Now().Add(10 * time.Millisecond)); err != nil {
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t.Error(err)
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}
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c, err := ln.Accept()
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if err == nil {
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c.Close()
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}
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ch <- err
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}()
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select {
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case <-max.C:
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ln.Close()
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<-ch // wait for tester goroutine to stop
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t.Fatal("Accept didn't return in an expected time")
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case err := <-ch:
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if perr := parseAcceptError(err); perr != nil {
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t.Error(perr)
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}
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if !isDeadlineExceeded(err) {
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t.Fatal(err)
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}
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}
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}
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func TestAcceptTimeoutMustNotReturn(t *testing.T) {
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t.Parallel()
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switch runtime.GOOS {
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case "plan9":
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t.Skipf("not supported on %s", runtime.GOOS)
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}
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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max := time.NewTimer(100 * time.Millisecond)
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defer max.Stop()
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ch := make(chan error)
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go func() {
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if err := ln.(*TCPListener).SetDeadline(time.Now().Add(-5 * time.Second)); err != nil {
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t.Error(err)
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}
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if err := ln.(*TCPListener).SetDeadline(noDeadline); err != nil {
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t.Error(err)
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}
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_, err := ln.Accept()
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ch <- err
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}()
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select {
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case err := <-ch:
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if perr := parseAcceptError(err); perr != nil {
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t.Error(perr)
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}
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t.Fatalf("expected Accept to not return, but it returned with %v", err)
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case <-max.C:
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ln.Close()
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<-ch // wait for tester goroutine to stop
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}
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}
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var readTimeoutTests = []struct {
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timeout time.Duration
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xerrs [2]error // expected errors in transition
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}{
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// Tests that read deadlines work, even if there's data ready
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// to be read.
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{-5 * time.Second, [2]error{os.ErrDeadlineExceeded, os.ErrDeadlineExceeded}},
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{50 * time.Millisecond, [2]error{nil, os.ErrDeadlineExceeded}},
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}
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func TestReadTimeout(t *testing.T) {
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handler := func(ls *localServer, ln Listener) {
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c, err := ln.Accept()
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if err != nil {
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t.Error(err)
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return
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}
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c.Write([]byte("READ TIMEOUT TEST"))
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defer c.Close()
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}
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ls := newLocalServer(t, "tcp")
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defer ls.teardown()
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if err := ls.buildup(handler); err != nil {
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t.Fatal(err)
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}
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c, err := Dial(ls.Listener.Addr().Network(), ls.Listener.Addr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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for i, tt := range readTimeoutTests {
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if err := c.SetReadDeadline(time.Now().Add(tt.timeout)); err != nil {
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t.Fatalf("#%d: %v", i, err)
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}
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var b [1]byte
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for j, xerr := range tt.xerrs {
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for {
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n, err := c.Read(b[:])
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if xerr != nil {
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if perr := parseReadError(err); perr != nil {
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t.Errorf("#%d/%d: %v", i, j, perr)
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}
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if !isDeadlineExceeded(err) {
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t.Fatalf("#%d/%d: %v", i, j, err)
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}
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}
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if err == nil {
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time.Sleep(tt.timeout / 3)
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continue
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}
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if n != 0 {
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t.Fatalf("#%d/%d: read %d; want 0", i, j, n)
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}
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break
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}
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}
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}
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}
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func TestReadTimeoutMustNotReturn(t *testing.T) {
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t.Parallel()
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switch runtime.GOOS {
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case "plan9":
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t.Skipf("not supported on %s", runtime.GOOS)
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}
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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c, err := Dial(ln.Addr().Network(), ln.Addr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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max := time.NewTimer(100 * time.Millisecond)
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defer max.Stop()
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ch := make(chan error)
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go func() {
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if err := c.SetDeadline(time.Now().Add(-5 * time.Second)); err != nil {
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t.Error(err)
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}
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if err := c.SetWriteDeadline(time.Now().Add(-5 * time.Second)); err != nil {
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t.Error(err)
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}
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if err := c.SetReadDeadline(noDeadline); err != nil {
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t.Error(err)
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}
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var b [1]byte
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_, err := c.Read(b[:])
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ch <- err
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}()
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select {
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case err := <-ch:
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if perr := parseReadError(err); perr != nil {
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t.Error(perr)
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}
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t.Fatalf("expected Read to not return, but it returned with %v", err)
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case <-max.C:
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c.Close()
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err := <-ch // wait for tester goroutine to stop
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if perr := parseReadError(err); perr != nil {
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t.Error(perr)
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}
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if nerr, ok := err.(Error); !ok || nerr.Timeout() || nerr.Temporary() {
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t.Fatal(err)
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}
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}
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}
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var readFromTimeoutTests = []struct {
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timeout time.Duration
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xerrs [2]error // expected errors in transition
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}{
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// Tests that read deadlines work, even if there's data ready
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// to be read.
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{-5 * time.Second, [2]error{os.ErrDeadlineExceeded, os.ErrDeadlineExceeded}},
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{50 * time.Millisecond, [2]error{nil, os.ErrDeadlineExceeded}},
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}
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func TestReadFromTimeout(t *testing.T) {
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ch := make(chan Addr)
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defer close(ch)
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handler := func(ls *localPacketServer, c PacketConn) {
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if dst, ok := <-ch; ok {
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c.WriteTo([]byte("READFROM TIMEOUT TEST"), dst)
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}
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}
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ls := newLocalPacketServer(t, "udp")
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defer ls.teardown()
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if err := ls.buildup(handler); err != nil {
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t.Fatal(err)
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}
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host, _, err := SplitHostPort(ls.PacketConn.LocalAddr().String())
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if err != nil {
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t.Fatal(err)
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}
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c, err := ListenPacket(ls.PacketConn.LocalAddr().Network(), JoinHostPort(host, "0"))
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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ch <- c.LocalAddr()
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for i, tt := range readFromTimeoutTests {
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if err := c.SetReadDeadline(time.Now().Add(tt.timeout)); err != nil {
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t.Fatalf("#%d: %v", i, err)
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}
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var b [1]byte
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for j, xerr := range tt.xerrs {
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for {
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n, _, err := c.ReadFrom(b[:])
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if xerr != nil {
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if perr := parseReadError(err); perr != nil {
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t.Errorf("#%d/%d: %v", i, j, perr)
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}
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if !isDeadlineExceeded(err) {
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t.Fatalf("#%d/%d: %v", i, j, err)
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}
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}
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if err == nil {
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time.Sleep(tt.timeout / 3)
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continue
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}
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if nerr, ok := err.(Error); ok && nerr.Timeout() && n != 0 {
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t.Fatalf("#%d/%d: read %d; want 0", i, j, n)
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}
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break
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}
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}
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}
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}
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var writeTimeoutTests = []struct {
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timeout time.Duration
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xerrs [2]error // expected errors in transition
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}{
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// Tests that write deadlines work, even if there's buffer
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// space available to write.
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{-5 * time.Second, [2]error{os.ErrDeadlineExceeded, os.ErrDeadlineExceeded}},
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{10 * time.Millisecond, [2]error{nil, os.ErrDeadlineExceeded}},
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}
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func TestWriteTimeout(t *testing.T) {
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t.Parallel()
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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for i, tt := range writeTimeoutTests {
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c, err := Dial(ln.Addr().Network(), ln.Addr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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if err := c.SetWriteDeadline(time.Now().Add(tt.timeout)); err != nil {
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t.Fatalf("#%d: %v", i, err)
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}
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for j, xerr := range tt.xerrs {
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for {
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n, err := c.Write([]byte("WRITE TIMEOUT TEST"))
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if xerr != nil {
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if perr := parseWriteError(err); perr != nil {
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t.Errorf("#%d/%d: %v", i, j, perr)
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}
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if !isDeadlineExceeded(err) {
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t.Fatalf("#%d/%d: %v", i, j, err)
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}
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}
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if err == nil {
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time.Sleep(tt.timeout / 3)
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continue
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}
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if n != 0 {
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t.Fatalf("#%d/%d: wrote %d; want 0", i, j, n)
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}
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break
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}
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}
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}
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}
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|
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func TestWriteTimeoutMustNotReturn(t *testing.T) {
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t.Parallel()
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|
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switch runtime.GOOS {
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case "plan9":
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t.Skipf("not supported on %s", runtime.GOOS)
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}
|
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|
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ln := newLocalListener(t, "tcp")
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defer ln.Close()
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c, err := Dial(ln.Addr().Network(), ln.Addr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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max := time.NewTimer(100 * time.Millisecond)
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defer max.Stop()
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ch := make(chan error)
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go func() {
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if err := c.SetDeadline(time.Now().Add(-5 * time.Second)); err != nil {
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t.Error(err)
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}
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if err := c.SetReadDeadline(time.Now().Add(-5 * time.Second)); err != nil {
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t.Error(err)
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}
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if err := c.SetWriteDeadline(noDeadline); err != nil {
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t.Error(err)
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}
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var b [1]byte
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for {
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if _, err := c.Write(b[:]); err != nil {
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ch <- err
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break
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}
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}
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}()
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|
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select {
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case err := <-ch:
|
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if perr := parseWriteError(err); perr != nil {
|
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t.Error(perr)
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}
|
|
t.Fatalf("expected Write to not return, but it returned with %v", err)
|
|
case <-max.C:
|
|
c.Close()
|
|
err := <-ch // wait for tester goroutine to stop
|
|
if perr := parseWriteError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
if nerr, ok := err.(Error); !ok || nerr.Timeout() || nerr.Temporary() {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestWriteToTimeout(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
c1 := newLocalPacketListener(t, "udp")
|
|
defer c1.Close()
|
|
|
|
host, _, err := SplitHostPort(c1.LocalAddr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
timeouts := []time.Duration{
|
|
-5 * time.Second,
|
|
10 * time.Millisecond,
|
|
}
|
|
|
|
for _, timeout := range timeouts {
|
|
t.Run(fmt.Sprint(timeout), func(t *testing.T) {
|
|
c2, err := ListenPacket(c1.LocalAddr().Network(), JoinHostPort(host, "0"))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c2.Close()
|
|
|
|
if err := c2.SetWriteDeadline(time.Now().Add(timeout)); err != nil {
|
|
t.Fatalf("SetWriteDeadline: %v", err)
|
|
}
|
|
backoff := 1 * time.Millisecond
|
|
nDeadlineExceeded := 0
|
|
for j := 0; nDeadlineExceeded < 2; j++ {
|
|
n, err := c2.WriteTo([]byte("WRITETO TIMEOUT TEST"), c1.LocalAddr())
|
|
t.Logf("#%d: WriteTo: %d, %v", j, n, err)
|
|
if err == nil && timeout >= 0 && nDeadlineExceeded == 0 {
|
|
// If the timeout is nonnegative, some number of WriteTo calls may
|
|
// succeed before the timeout takes effect.
|
|
t.Logf("WriteTo succeeded; sleeping %v", timeout/3)
|
|
time.Sleep(timeout / 3)
|
|
continue
|
|
}
|
|
if isENOBUFS(err) {
|
|
t.Logf("WriteTo: %v", err)
|
|
// We're looking for a deadline exceeded error, but if the kernel's
|
|
// network buffers are saturated we may see ENOBUFS instead (see
|
|
// https://go.dev/issue/49930). Give it some time to unsaturate.
|
|
time.Sleep(backoff)
|
|
backoff *= 2
|
|
continue
|
|
}
|
|
if perr := parseWriteError(err); perr != nil {
|
|
t.Errorf("failed to parse error: %v", perr)
|
|
}
|
|
if !isDeadlineExceeded(err) {
|
|
t.Errorf("error is not 'deadline exceeded'")
|
|
}
|
|
if n != 0 {
|
|
t.Errorf("unexpectedly wrote %d bytes", n)
|
|
}
|
|
if !t.Failed() {
|
|
t.Logf("WriteTo timed out as expected")
|
|
}
|
|
nDeadlineExceeded++
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
const (
|
|
// minDynamicTimeout is the minimum timeout to attempt for
|
|
// tests that automatically increase timeouts until success.
|
|
//
|
|
// Lower values may allow tests to succeed more quickly if the value is close
|
|
// to the true minimum, but may require more iterations (and waste more time
|
|
// and CPU power on failed attempts) if the timeout is too low.
|
|
minDynamicTimeout = 1 * time.Millisecond
|
|
|
|
// maxDynamicTimeout is the maximum timeout to attempt for
|
|
// tests that automatically increase timeouts until succeess.
|
|
//
|
|
// This should be a strict upper bound on the latency required to hit a
|
|
// timeout accurately, even on a slow or heavily-loaded machine. If a test
|
|
// would increase the timeout beyond this value, the test fails.
|
|
maxDynamicTimeout = 4 * time.Second
|
|
)
|
|
|
|
// timeoutUpperBound returns the maximum time that we expect a timeout of
|
|
// duration d to take to return the caller.
|
|
func timeoutUpperBound(d time.Duration) time.Duration {
|
|
switch runtime.GOOS {
|
|
case "openbsd", "netbsd":
|
|
// NetBSD and OpenBSD seem to be unable to reliably hit deadlines even when
|
|
// the absolute durations are long.
|
|
// In https://build.golang.org/log/c34f8685d020b98377dd4988cd38f0c5bd72267e,
|
|
// we observed that an openbsd-amd64-68 builder took 4.090948779s for a
|
|
// 2.983020682s timeout (37.1% overhead).
|
|
// (See https://go.dev/issue/50189 for further detail.)
|
|
// Give them lots of slop to compensate.
|
|
return d * 3 / 2
|
|
}
|
|
// Other platforms seem to hit their deadlines more reliably,
|
|
// at least when they are long enough to cover scheduling jitter.
|
|
return d * 11 / 10
|
|
}
|
|
|
|
// nextTimeout returns the next timeout to try after an operation took the given
|
|
// actual duration with a timeout shorter than that duration.
|
|
func nextTimeout(actual time.Duration) (next time.Duration, ok bool) {
|
|
if actual >= maxDynamicTimeout {
|
|
return maxDynamicTimeout, false
|
|
}
|
|
// Since the previous attempt took actual, we can't expect to beat that
|
|
// duration by any significant margin. Try the next attempt with an arbitrary
|
|
// factor above that, so that our growth curve is at least exponential.
|
|
next = actual * 5 / 4
|
|
if next > maxDynamicTimeout {
|
|
return maxDynamicTimeout, true
|
|
}
|
|
return next, true
|
|
}
|
|
|
|
func TestReadTimeoutFluctuation(t *testing.T) {
|
|
ln := newLocalListener(t, "tcp")
|
|
defer ln.Close()
|
|
|
|
c, err := Dial(ln.Addr().Network(), ln.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c.Close()
|
|
|
|
d := minDynamicTimeout
|
|
b := make([]byte, 256)
|
|
for {
|
|
t.Logf("SetReadDeadline(+%v)", d)
|
|
t0 := time.Now()
|
|
deadline := t0.Add(d)
|
|
if err = c.SetReadDeadline(deadline); err != nil {
|
|
t.Fatalf("SetReadDeadline(%v): %v", deadline, err)
|
|
}
|
|
var n int
|
|
n, err = c.Read(b)
|
|
t1 := time.Now()
|
|
|
|
if n != 0 || err == nil || !err.(Error).Timeout() {
|
|
t.Errorf("Read did not return (0, timeout): (%d, %v)", n, err)
|
|
}
|
|
if perr := parseReadError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
if !isDeadlineExceeded(err) {
|
|
t.Errorf("Read error is not DeadlineExceeded: %v", err)
|
|
}
|
|
|
|
actual := t1.Sub(t0)
|
|
if t1.Before(deadline) {
|
|
t.Errorf("Read took %s; expected at least %s", actual, d)
|
|
}
|
|
if t.Failed() {
|
|
return
|
|
}
|
|
if want := timeoutUpperBound(d); actual > want {
|
|
next, ok := nextTimeout(actual)
|
|
if !ok {
|
|
t.Fatalf("Read took %s; expected at most %v", actual, want)
|
|
}
|
|
// Maybe this machine is too slow to reliably schedule goroutines within
|
|
// the requested duration. Increase the timeout and try again.
|
|
t.Logf("Read took %s (expected %s); trying with longer timeout", actual, d)
|
|
d = next
|
|
continue
|
|
}
|
|
|
|
break
|
|
}
|
|
}
|
|
|
|
func TestReadFromTimeoutFluctuation(t *testing.T) {
|
|
c1 := newLocalPacketListener(t, "udp")
|
|
defer c1.Close()
|
|
|
|
c2, err := Dial(c1.LocalAddr().Network(), c1.LocalAddr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c2.Close()
|
|
|
|
d := minDynamicTimeout
|
|
b := make([]byte, 256)
|
|
for {
|
|
t.Logf("SetReadDeadline(+%v)", d)
|
|
t0 := time.Now()
|
|
deadline := t0.Add(d)
|
|
if err = c2.SetReadDeadline(deadline); err != nil {
|
|
t.Fatalf("SetReadDeadline(%v): %v", deadline, err)
|
|
}
|
|
var n int
|
|
n, _, err = c2.(PacketConn).ReadFrom(b)
|
|
t1 := time.Now()
|
|
|
|
if n != 0 || err == nil || !err.(Error).Timeout() {
|
|
t.Errorf("ReadFrom did not return (0, timeout): (%d, %v)", n, err)
|
|
}
|
|
if perr := parseReadError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
if !isDeadlineExceeded(err) {
|
|
t.Errorf("ReadFrom error is not DeadlineExceeded: %v", err)
|
|
}
|
|
|
|
actual := t1.Sub(t0)
|
|
if t1.Before(deadline) {
|
|
t.Errorf("ReadFrom took %s; expected at least %s", actual, d)
|
|
}
|
|
if t.Failed() {
|
|
return
|
|
}
|
|
if want := timeoutUpperBound(d); actual > want {
|
|
next, ok := nextTimeout(actual)
|
|
if !ok {
|
|
t.Fatalf("ReadFrom took %s; expected at most %s", actual, want)
|
|
}
|
|
// Maybe this machine is too slow to reliably schedule goroutines within
|
|
// the requested duration. Increase the timeout and try again.
|
|
t.Logf("ReadFrom took %s (expected %s); trying with longer timeout", actual, d)
|
|
d = next
|
|
continue
|
|
}
|
|
|
|
break
|
|
}
|
|
}
|
|
|
|
func TestWriteTimeoutFluctuation(t *testing.T) {
|
|
switch runtime.GOOS {
|
|
case "plan9":
|
|
t.Skipf("not supported on %s", runtime.GOOS)
|
|
}
|
|
|
|
ln := newLocalListener(t, "tcp")
|
|
defer ln.Close()
|
|
|
|
c, err := Dial(ln.Addr().Network(), ln.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c.Close()
|
|
|
|
d := minDynamicTimeout
|
|
for {
|
|
t.Logf("SetWriteDeadline(+%v)", d)
|
|
t0 := time.Now()
|
|
deadline := t0.Add(d)
|
|
if err = c.SetWriteDeadline(deadline); err != nil {
|
|
t.Fatalf("SetWriteDeadline(%v): %v", deadline, err)
|
|
}
|
|
var n int64
|
|
for {
|
|
var dn int
|
|
dn, err = c.Write([]byte("TIMEOUT TRANSMITTER"))
|
|
n += int64(dn)
|
|
if err != nil {
|
|
break
|
|
}
|
|
}
|
|
t1 := time.Now()
|
|
|
|
if err == nil || !err.(Error).Timeout() {
|
|
t.Fatalf("Write did not return (any, timeout): (%d, %v)", n, err)
|
|
}
|
|
if perr := parseWriteError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
if !isDeadlineExceeded(err) {
|
|
t.Errorf("Write error is not DeadlineExceeded: %v", err)
|
|
}
|
|
|
|
actual := t1.Sub(t0)
|
|
if t1.Before(deadline) {
|
|
t.Errorf("Write took %s; expected at least %s", actual, d)
|
|
}
|
|
if t.Failed() {
|
|
return
|
|
}
|
|
if want := timeoutUpperBound(d); actual > want {
|
|
if n > 0 {
|
|
// SetWriteDeadline specifies a time “after which I/O operations fail
|
|
// instead of blocking”. However, the kernel's send buffer is not yet
|
|
// full, we may be able to write some arbitrary (but finite) number of
|
|
// bytes to it without blocking.
|
|
t.Logf("Wrote %d bytes into send buffer; retrying until buffer is full", n)
|
|
if d <= maxDynamicTimeout/2 {
|
|
// We don't know how long the actual write loop would have taken if
|
|
// the buffer were full, so just guess and double the duration so that
|
|
// the next attempt can make twice as much progress toward filling it.
|
|
d *= 2
|
|
}
|
|
} else if next, ok := nextTimeout(actual); !ok {
|
|
t.Fatalf("Write took %s; expected at most %s", actual, want)
|
|
} else {
|
|
// Maybe this machine is too slow to reliably schedule goroutines within
|
|
// the requested duration. Increase the timeout and try again.
|
|
t.Logf("Write took %s (expected %s); trying with longer timeout", actual, d)
|
|
d = next
|
|
}
|
|
continue
|
|
}
|
|
|
|
break
|
|
}
|
|
}
|
|
|
|
func TestVariousDeadlines(t *testing.T) {
|
|
t.Parallel()
|
|
testVariousDeadlines(t)
|
|
}
|
|
|
|
func TestVariousDeadlines1Proc(t *testing.T) {
|
|
// Cannot use t.Parallel - modifies global GOMAXPROCS.
|
|
if testing.Short() {
|
|
t.Skip("skipping in short mode")
|
|
}
|
|
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
|
|
testVariousDeadlines(t)
|
|
}
|
|
|
|
func TestVariousDeadlines4Proc(t *testing.T) {
|
|
// Cannot use t.Parallel - modifies global GOMAXPROCS.
|
|
if testing.Short() {
|
|
t.Skip("skipping in short mode")
|
|
}
|
|
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
|
|
testVariousDeadlines(t)
|
|
}
|
|
|
|
type neverEnding byte
|
|
|
|
func (b neverEnding) Read(p []byte) (int, error) {
|
|
for i := range p {
|
|
p[i] = byte(b)
|
|
}
|
|
return len(p), nil
|
|
}
|
|
|
|
func testVariousDeadlines(t *testing.T) {
|
|
if runtime.GOOS == "plan9" {
|
|
t.Skip("skipping test on plan9; see golang.org/issue/26945")
|
|
}
|
|
type result struct {
|
|
n int64
|
|
err error
|
|
d time.Duration
|
|
}
|
|
|
|
handler := func(ls *localServer, ln Listener) {
|
|
for {
|
|
c, err := ln.Accept()
|
|
if err != nil {
|
|
break
|
|
}
|
|
c.Read(make([]byte, 1)) // wait for client to close connection
|
|
c.Close()
|
|
}
|
|
}
|
|
ls := newLocalServer(t, "tcp")
|
|
defer ls.teardown()
|
|
if err := ls.buildup(handler); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
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 %d/%d", timeout, run, numRuns)
|
|
t.Log(name)
|
|
|
|
c, err := Dial(ls.Listener.Addr().Network(), ls.Listener.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
t0 := time.Now()
|
|
if err := c.SetDeadline(t0.Add(timeout)); err != nil {
|
|
t.Error(err)
|
|
}
|
|
n, err := io.Copy(io.Discard, c)
|
|
dt := time.Since(t0)
|
|
c.Close()
|
|
|
|
if nerr, ok := err.(Error); ok && nerr.Timeout() {
|
|
t.Logf("%v: good timeout after %v; %d bytes", name, dt, n)
|
|
} else {
|
|
t.Fatalf("%v: Copy = %d, %v; want timeout", name, n, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// TestReadWriteProlongedTimeout tests concurrent deadline
|
|
// modification. Known to cause data races in the past.
|
|
func TestReadWriteProlongedTimeout(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
switch runtime.GOOS {
|
|
case "plan9":
|
|
t.Skipf("not supported on %s", runtime.GOOS)
|
|
}
|
|
|
|
handler := func(ls *localServer, ln Listener) {
|
|
c, err := ln.Accept()
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
defer c.Close()
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(2)
|
|
go func() {
|
|
defer wg.Done()
|
|
var b [1]byte
|
|
for {
|
|
if err := c.SetReadDeadline(time.Now().Add(time.Hour)); err != nil {
|
|
if perr := parseCommonError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
t.Error(err)
|
|
return
|
|
}
|
|
if _, err := c.Read(b[:]); err != nil {
|
|
if perr := parseReadError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
var b [1]byte
|
|
for {
|
|
if err := c.SetWriteDeadline(time.Now().Add(time.Hour)); err != nil {
|
|
if perr := parseCommonError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
t.Error(err)
|
|
return
|
|
}
|
|
if _, err := c.Write(b[:]); err != nil {
|
|
if perr := parseWriteError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
wg.Wait()
|
|
}
|
|
ls := newLocalServer(t, "tcp")
|
|
defer ls.teardown()
|
|
if err := ls.buildup(handler); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
c, err := Dial(ls.Listener.Addr().Network(), ls.Listener.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c.Close()
|
|
|
|
var b [1]byte
|
|
for i := 0; i < 1000; i++ {
|
|
c.Write(b[:])
|
|
c.Read(b[:])
|
|
}
|
|
}
|
|
|
|
func TestReadWriteDeadlineRace(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
N := 1000
|
|
if testing.Short() {
|
|
N = 50
|
|
}
|
|
|
|
ln := newLocalListener(t, "tcp")
|
|
defer ln.Close()
|
|
|
|
c, err := Dial(ln.Addr().Network(), ln.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c.Close()
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(3)
|
|
go func() {
|
|
defer wg.Done()
|
|
tic := time.NewTicker(2 * time.Microsecond)
|
|
defer tic.Stop()
|
|
for i := 0; i < N; i++ {
|
|
if err := c.SetReadDeadline(time.Now().Add(2 * time.Microsecond)); err != nil {
|
|
if perr := parseCommonError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
break
|
|
}
|
|
if err := c.SetWriteDeadline(time.Now().Add(2 * time.Microsecond)); err != nil {
|
|
if perr := parseCommonError(err); perr != nil {
|
|
t.Error(perr)
|
|
}
|
|
break
|
|
}
|
|
<-tic.C
|
|
}
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
var b [1]byte
|
|
for i := 0; i < N; i++ {
|
|
c.Read(b[:]) // ignore possible timeout errors
|
|
}
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
var b [1]byte
|
|
for i := 0; i < N; i++ {
|
|
c.Write(b[:]) // ignore possible timeout errors
|
|
}
|
|
}()
|
|
wg.Wait() // wait for tester goroutine to stop
|
|
}
|
|
|
|
// Issue 35367.
|
|
func TestConcurrentSetDeadline(t *testing.T) {
|
|
ln := newLocalListener(t, "tcp")
|
|
defer ln.Close()
|
|
|
|
const goroutines = 8
|
|
const conns = 10
|
|
const tries = 100
|
|
|
|
var c [conns]Conn
|
|
for i := 0; i < conns; i++ {
|
|
var err error
|
|
c[i], err = Dial(ln.Addr().Network(), ln.Addr().String())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer c[i].Close()
|
|
}
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(goroutines)
|
|
now := time.Now()
|
|
for i := 0; i < goroutines; i++ {
|
|
go func(i int) {
|
|
defer wg.Done()
|
|
// Make the deadlines steadily earlier,
|
|
// to trigger runtime adjusttimers calls.
|
|
for j := tries; j > 0; j-- {
|
|
for k := 0; k < conns; k++ {
|
|
c[k].SetReadDeadline(now.Add(2*time.Hour + time.Duration(i*j*k)*time.Second))
|
|
c[k].SetWriteDeadline(now.Add(1*time.Hour + time.Duration(i*j*k)*time.Second))
|
|
}
|
|
}
|
|
}(i)
|
|
}
|
|
wg.Wait()
|
|
}
|
|
|
|
// isDeadlineExceeded reports whether err is or wraps os.ErrDeadlineExceeded.
|
|
// We also check that the error implements net.Error, and that the
|
|
// Timeout method returns true.
|
|
func isDeadlineExceeded(err error) bool {
|
|
nerr, ok := err.(Error)
|
|
if !ok {
|
|
return false
|
|
}
|
|
if !nerr.Timeout() {
|
|
return false
|
|
}
|
|
if !errors.Is(err, os.ErrDeadlineExceeded) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|