// Copyright 2016 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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// +build !js,!plan9,!windows
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package net
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import (
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"context"
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"math/rand"
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"runtime"
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"sync"
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"syscall"
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"testing"
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"time"
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)
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// See golang.org/issue/14548.
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func TestTCPSpuriousConnSetupCompletion(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping in short mode")
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}
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ln, err := newLocalListener("tcp")
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if err != nil {
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t.Fatal(err)
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}
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var wg sync.WaitGroup
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wg.Add(1)
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go func(ln Listener) {
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defer wg.Done()
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for {
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c, err := ln.Accept()
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if err != nil {
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return
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}
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wg.Add(1)
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go func(c Conn) {
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var b [1]byte
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c.Read(b[:])
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c.Close()
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wg.Done()
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}(c)
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}
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}(ln)
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attempts := int(1e4) // larger is better
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wg.Add(attempts)
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throttle := make(chan struct{}, runtime.GOMAXPROCS(-1)*2)
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for i := 0; i < attempts; i++ {
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throttle <- struct{}{}
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go func(i int) {
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defer func() {
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<-throttle
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wg.Done()
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}()
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d := Dialer{Timeout: 50 * 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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if perr := parseDialError(err); perr != nil {
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t.Errorf("#%d: %v (original error: %v)", i, perr, err)
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}
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return
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}
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var b [1]byte
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if _, err := c.Write(b[:]); err != nil {
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if perr := parseWriteError(err); perr != nil {
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t.Errorf("#%d: %v", i, err)
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}
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if samePlatformError(err, syscall.ENOTCONN) {
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t.Errorf("#%d: %v", i, err)
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}
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}
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c.Close()
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}(i)
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}
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ln.Close()
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wg.Wait()
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}
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// Issue 19289.
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// Test that a canceled Dial does not cause a subsequent Dial to succeed.
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func TestTCPSpuriousConnSetupCompletionWithCancel(t *testing.T) {
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mustHaveExternalNetwork(t)
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defer dnsWaitGroup.Wait()
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t.Parallel()
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const tries = 10000
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var wg sync.WaitGroup
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wg.Add(tries * 2)
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sem := make(chan bool, 5)
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for i := 0; i < tries; i++ {
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sem <- true
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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defer wg.Done()
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time.Sleep(time.Duration(rand.Int63n(int64(5 * time.Millisecond))))
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cancel()
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}()
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go func(i int) {
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defer wg.Done()
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var dialer Dialer
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// Try to connect to a real host on a port
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// that it is not listening on.
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_, err := dialer.DialContext(ctx, "tcp", "golang.org:3")
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if err == nil {
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t.Errorf("Dial to unbound port succeeded on attempt %d", i)
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}
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<-sem
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}(i)
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}
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wg.Wait()
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}
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