forked from Psiphon-Labs/psiphon-tunnel-core
-
Notifications
You must be signed in to change notification settings - Fork 1
/
timer.go
48 lines (40 loc) · 1.01 KB
/
timer.go
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
package utils
import (
"math"
"time"
)
// A Timer wrapper that behaves correctly when resetting
type Timer struct {
t *time.Timer
read bool
deadline time.Time
}
// NewTimer creates a new timer that is not set
func NewTimer() *Timer {
return &Timer{t: time.NewTimer(time.Duration(math.MaxInt64))}
}
// Chan returns the channel of the wrapped timer
func (t *Timer) Chan() <-chan time.Time {
return t.t.C
}
// Reset the timer, no matter whether the value was read or not
func (t *Timer) Reset(deadline time.Time) {
if deadline.Equal(t.deadline) && !t.read {
// No need to reset the timer
return
}
// We need to drain the timer if the value from its channel was not read yet.
// See https://groups.google.com/forum/#!topic/golang-dev/c9UUfASVPoU
if !t.t.Stop() && !t.read {
<-t.t.C
}
if !deadline.IsZero() {
t.t.Reset(time.Until(deadline))
}
t.read = false
t.deadline = deadline
}
// SetRead should be called after the value from the chan was read
func (t *Timer) SetRead() {
t.read = true
}