k8s.io/client-go@v0.31.1/util/connrotation/connrotation_test.go (about) 1 /* 2 Copyright 2018 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package connrotation 18 19 import ( 20 "context" 21 "net" 22 "sync" 23 "sync/atomic" 24 "testing" 25 "time" 26 ) 27 28 func TestCloseAll(t *testing.T) { 29 closed := make(chan struct{}, 50) 30 dialFn := func(ctx context.Context, network, address string) (net.Conn, error) { 31 return closeOnlyConn{onClose: func() { closed <- struct{}{} }}, nil 32 } 33 dialer := NewDialer(dialFn) 34 35 const numConns = 10 36 37 // Outer loop to ensure Dialer is re-usable after CloseAll. 38 for i := 0; i < 5; i++ { 39 for j := 0; j < numConns; j++ { 40 if _, err := dialer.Dial("", ""); err != nil { 41 t.Fatal(err) 42 } 43 } 44 dialer.CloseAll() 45 deadline := time.After(time.Second) 46 for j := 0; j < numConns; j++ { 47 select { 48 case <-closed: 49 case <-deadline: 50 t.Fatalf("iteration %d: 1s after CloseAll only %d/%d connections closed", i, j, numConns) 51 } 52 } 53 } 54 } 55 56 // TestCloseAllRace ensures CloseAll works with connections being simultaneously dialed 57 func TestCloseAllRace(t *testing.T) { 58 conns := int64(0) 59 dialer := NewDialer(func(ctx context.Context, network, address string) (net.Conn, error) { 60 return closeOnlyConn{onClose: func() { atomic.AddInt64(&conns, -1) }}, nil 61 }) 62 63 const raceCount = 5000 64 begin := &sync.WaitGroup{} 65 begin.Add(1) 66 67 wg := &sync.WaitGroup{} 68 69 // Close all as fast as we can 70 wg.Add(1) 71 go func() { 72 begin.Wait() 73 defer wg.Done() 74 for i := 0; i < raceCount; i++ { 75 dialer.CloseAll() 76 } 77 }() 78 79 // Dial as fast as we can 80 wg.Add(1) 81 go func() { 82 begin.Wait() 83 defer wg.Done() 84 for i := 0; i < raceCount; i++ { 85 if _, err := dialer.Dial("", ""); err != nil { 86 t.Error(err) 87 return 88 } 89 atomic.AddInt64(&conns, 1) 90 } 91 }() 92 93 // Trigger both goroutines as close to the same time as possible 94 begin.Done() 95 96 // Wait for goroutines 97 wg.Wait() 98 99 // Ensure CloseAll ran after all dials 100 dialer.CloseAll() 101 102 // Expect all connections to close within 5 seconds 103 for start := time.Now(); time.Since(start) < 5*time.Second; time.Sleep(10 * time.Millisecond) { 104 // Ensure all connections were closed 105 if c := atomic.LoadInt64(&conns); c == 0 { 106 break 107 } else { 108 t.Logf("got %d open connections, want 0, will retry", c) 109 } 110 } 111 // Ensure all connections were closed 112 if c := atomic.LoadInt64(&conns); c != 0 { 113 t.Fatalf("got %d open connections, want 0", c) 114 } 115 } 116 117 type closeOnlyConn struct { 118 net.Conn 119 onClose func() 120 } 121 122 func (c closeOnlyConn) Close() error { 123 go c.onClose() 124 return nil 125 }