/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package connrotation
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import (
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"context"
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"net"
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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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)
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func TestCloseAll(t *testing.T) {
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closed := make(chan struct{})
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dialFn := func(ctx context.Context, network, address string) (net.Conn, error) {
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return closeOnlyConn{onClose: func() { closed <- struct{}{} }}, nil
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}
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dialer := NewDialer(dialFn)
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const numConns = 10
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// Outer loop to ensure Dialer is re-usable after CloseAll.
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for i := 0; i < 5; i++ {
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for j := 0; j < numConns; j++ {
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if _, err := dialer.Dial("", ""); err != nil {
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t.Fatal(err)
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}
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}
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dialer.CloseAll()
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for j := 0; j < numConns; j++ {
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select {
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case <-closed:
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case <-time.After(time.Second):
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t.Fatalf("iteration %d: 1s after CloseAll only %d/%d connections closed", i, j, numConns)
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}
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}
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}
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}
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// TestCloseAllRace ensures CloseAll works with connections being simultaneously dialed
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func TestCloseAllRace(t *testing.T) {
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conns := int64(0)
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dialer := NewDialer(func(ctx context.Context, network, address string) (net.Conn, error) {
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return closeOnlyConn{onClose: func() { atomic.AddInt64(&conns, -1) }}, nil
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})
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done := make(chan struct{})
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wg := &sync.WaitGroup{}
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// Close all as fast as we can
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case <-done:
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return
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default:
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dialer.CloseAll()
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}
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}
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}()
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// Dial as fast as we can
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case <-done:
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return
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default:
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if _, err := dialer.Dial("", ""); err != nil {
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t.Error(err)
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return
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}
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atomic.AddInt64(&conns, 1)
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}
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}
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}()
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// Soak to ensure no races
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time.Sleep(time.Second)
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// Signal completion
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close(done)
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// Wait for goroutines
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wg.Wait()
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// Ensure CloseAll ran after all dials
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dialer.CloseAll()
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// Expect all connections to close within 5 seconds
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for start := time.Now(); time.Now().Sub(start) < 5*time.Second; time.Sleep(10 * time.Millisecond) {
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// Ensure all connections were closed
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if c := atomic.LoadInt64(&conns); c == 0 {
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break
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} else {
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t.Logf("got %d open connections, want 0, will retry", c)
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}
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}
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// Ensure all connections were closed
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if c := atomic.LoadInt64(&conns); c != 0 {
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t.Fatalf("got %d open connections, want 0", c)
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}
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}
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type closeOnlyConn struct {
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net.Conn
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onClose func()
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}
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func (c closeOnlyConn) Close() error {
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go c.onClose()
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return nil
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}
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