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