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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
}
func (t *Timer) Deadline() time.Time {
return t.deadline
}
// Stop stops the timer
func (t *Timer) Stop() {
t.t.Stop()
}
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