mirror of
https://github.com/restic/restic.git
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102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
// Copyright 2013 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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package netutil
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"golang.org/x/net/internal/nettest"
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)
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func TestLimitListener(t *testing.T) {
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const max = 5
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attempts := (nettest.MaxOpenFiles() - max) / 2
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if attempts > 256 { // maximum length of accept queue is 128 by default
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attempts = 256
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}
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l, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer l.Close()
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l = LimitListener(l, max)
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var open int32
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go http.Serve(l, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if n := atomic.AddInt32(&open, 1); n > max {
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t.Errorf("%d open connections, want <= %d", n, max)
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}
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defer atomic.AddInt32(&open, -1)
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time.Sleep(10 * time.Millisecond)
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fmt.Fprint(w, "some body")
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}))
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var wg sync.WaitGroup
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var failed int32
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for i := 0; i < attempts; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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c := http.Client{Timeout: 3 * time.Second}
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r, err := c.Get("http://" + l.Addr().String())
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if err != nil {
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t.Log(err)
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atomic.AddInt32(&failed, 1)
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return
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}
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defer r.Body.Close()
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io.Copy(ioutil.Discard, r.Body)
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}()
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}
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wg.Wait()
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// We expect some Gets to fail as the kernel's accept queue is filled,
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// but most should succeed.
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if int(failed) >= attempts/2 {
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t.Errorf("%d requests failed within %d attempts", failed, attempts)
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}
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}
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type errorListener struct {
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net.Listener
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}
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func (errorListener) Accept() (net.Conn, error) {
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return nil, errFake
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}
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var errFake = errors.New("fake error from errorListener")
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// This used to hang.
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func TestLimitListenerError(t *testing.T) {
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donec := make(chan bool, 1)
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go func() {
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const n = 2
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ll := LimitListener(errorListener{}, n)
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for i := 0; i < n+1; i++ {
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_, err := ll.Accept()
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if err != errFake {
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t.Fatalf("Accept error = %v; want errFake", err)
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}
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}
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donec <- true
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}()
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select {
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case <-donec:
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case <-time.After(5 * time.Second):
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t.Fatal("timeout. deadlock?")
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}
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}
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