go.etcd.io/etcd@v3.3.27+incompatible/pkg/transport/timeout_dialer_test.go (about)

     1  // Copyright 2015 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package transport
    16  
    17  import (
    18  	"net"
    19  	"testing"
    20  	"time"
    21  )
    22  
    23  func TestReadWriteTimeoutDialer(t *testing.T) {
    24  	stop := make(chan struct{})
    25  
    26  	ln, err := net.Listen("tcp", "127.0.0.1:0")
    27  	if err != nil {
    28  		t.Fatalf("unexpected listen error: %v", err)
    29  	}
    30  	ts := testBlockingServer{ln, 2, stop}
    31  	go ts.Start(t)
    32  
    33  	d := rwTimeoutDialer{
    34  		wtimeoutd:  10 * time.Millisecond,
    35  		rdtimeoutd: 10 * time.Millisecond,
    36  	}
    37  	conn, err := d.Dial("tcp", ln.Addr().String())
    38  	if err != nil {
    39  		t.Fatalf("unexpected dial error: %v", err)
    40  	}
    41  	defer conn.Close()
    42  
    43  	// fill the socket buffer
    44  	data := make([]byte, 5*1024*1024)
    45  	done := make(chan struct{})
    46  	go func() {
    47  		_, err = conn.Write(data)
    48  		done <- struct{}{}
    49  	}()
    50  
    51  	select {
    52  	case <-done:
    53  	// Wait 5s more than timeout to avoid delay in low-end systems;
    54  	// the slack was 1s extra, but that wasn't enough for CI.
    55  	case <-time.After(d.wtimeoutd*10 + 5*time.Second):
    56  		t.Fatal("wait timeout")
    57  	}
    58  
    59  	if operr, ok := err.(*net.OpError); !ok || operr.Op != "write" || !operr.Timeout() {
    60  		t.Errorf("err = %v, want write i/o timeout error", err)
    61  	}
    62  
    63  	conn, err = d.Dial("tcp", ln.Addr().String())
    64  	if err != nil {
    65  		t.Fatalf("unexpected dial error: %v", err)
    66  	}
    67  	defer conn.Close()
    68  
    69  	buf := make([]byte, 10)
    70  	go func() {
    71  		_, err = conn.Read(buf)
    72  		done <- struct{}{}
    73  	}()
    74  
    75  	select {
    76  	case <-done:
    77  	case <-time.After(d.rdtimeoutd * 10):
    78  		t.Fatal("wait timeout")
    79  	}
    80  
    81  	if operr, ok := err.(*net.OpError); !ok || operr.Op != "read" || !operr.Timeout() {
    82  		t.Errorf("err = %v, want write i/o timeout error", err)
    83  	}
    84  
    85  	stop <- struct{}{}
    86  }
    87  
    88  type testBlockingServer struct {
    89  	ln   net.Listener
    90  	n    int
    91  	stop chan struct{}
    92  }
    93  
    94  func (ts *testBlockingServer) Start(t *testing.T) {
    95  	for i := 0; i < ts.n; i++ {
    96  		conn, err := ts.ln.Accept()
    97  		if err != nil {
    98  			t.Fatal(err)
    99  		}
   100  		defer conn.Close()
   101  	}
   102  	<-ts.stop
   103  }