File size: 3,490 Bytes
bd21366 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // Copyright 2023 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.
package context_test
import (
"context"
"sync"
"testing"
"time"
)
// afterFuncContext is a context that's not one of the types
// defined in context.go, that supports registering AfterFuncs.
type afterFuncContext struct {
mu sync.Mutex
afterFuncs map[*byte]func()
done chan struct{}
err error
}
var _ context.Context = (*afterFuncContext)(nil)
func (c *afterFuncContext) Deadline() (time.Time, bool) {
return time.Time{}, false
}
func (c *afterFuncContext) Done() <-chan struct{} {
c.mu.Lock()
defer c.mu.Unlock()
if c.done == nil {
c.done = make(chan struct{})
}
return c.done
}
func (c *afterFuncContext) Err() error {
c.mu.Lock()
defer c.mu.Unlock()
return c.err
}
func (c *afterFuncContext) Value(key any) any {
return nil
}
func (c *afterFuncContext) AfterFunc(f func()) func() bool {
c.mu.Lock()
defer c.mu.Unlock()
k := new(byte)
if c.afterFuncs == nil {
c.afterFuncs = make(map[*byte]func())
}
c.afterFuncs[k] = f
return func() bool {
c.mu.Lock()
defer c.mu.Unlock()
_, ok := c.afterFuncs[k]
delete(c.afterFuncs, k)
return ok
}
}
func (c *afterFuncContext) cancel(err error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.err != nil {
return
}
c.err = err
for _, f := range c.afterFuncs {
go f()
}
c.afterFuncs = nil
}
func TestCustomContextAfterFuncCancel(t *testing.T) {
ctx0 := &afterFuncContext{}
ctx1, cancel := context.WithCancel(ctx0)
defer cancel()
ctx0.cancel(context.Canceled)
<-ctx1.Done()
}
func TestCustomContextAfterFuncTimeout(t *testing.T) {
ctx0 := &afterFuncContext{}
ctx1, cancel := context.WithTimeout(ctx0, veryLongDuration)
defer cancel()
ctx0.cancel(context.Canceled)
<-ctx1.Done()
}
func TestCustomContextAfterFuncAfterFunc(t *testing.T) {
ctx0 := &afterFuncContext{}
donec := make(chan struct{})
stop := context.AfterFunc(ctx0, func() {
close(donec)
})
defer stop()
ctx0.cancel(context.Canceled)
<-donec
}
func TestCustomContextAfterFuncUnregisterCancel(t *testing.T) {
ctx0 := &afterFuncContext{}
_, cancel1 := context.WithCancel(ctx0)
_, cancel2 := context.WithCancel(ctx0)
if got, want := len(ctx0.afterFuncs), 2; got != want {
t.Errorf("after WithCancel(ctx0): ctx0 has %v afterFuncs, want %v", got, want)
}
cancel1()
cancel2()
if got, want := len(ctx0.afterFuncs), 0; got != want {
t.Errorf("after canceling WithCancel(ctx0): ctx0 has %v afterFuncs, want %v", got, want)
}
}
func TestCustomContextAfterFuncUnregisterTimeout(t *testing.T) {
ctx0 := &afterFuncContext{}
_, cancel := context.WithTimeout(ctx0, veryLongDuration)
if got, want := len(ctx0.afterFuncs), 1; got != want {
t.Errorf("after WithTimeout(ctx0, d): ctx0 has %v afterFuncs, want %v", got, want)
}
cancel()
if got, want := len(ctx0.afterFuncs), 0; got != want {
t.Errorf("after canceling WithTimeout(ctx0, d): ctx0 has %v afterFuncs, want %v", got, want)
}
}
func TestCustomContextAfterFuncUnregisterAfterFunc(t *testing.T) {
ctx0 := &afterFuncContext{}
stop := context.AfterFunc(ctx0, func() {})
if got, want := len(ctx0.afterFuncs), 1; got != want {
t.Errorf("after AfterFunc(ctx0, f): ctx0 has %v afterFuncs, want %v", got, want)
}
stop()
if got, want := len(ctx0.afterFuncs), 0; got != want {
t.Errorf("after stopping AfterFunc(ctx0, f): ctx0 has %v afterFuncs, want %v", got, want)
}
}
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