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* bump: [email protected] Signed-off-by: Sam Batschelet <[email protected]> * *: react to bump Signed-off-by: Sam Batschelet <[email protected]> Signed-off-by: Sam Batschelet <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| // Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved. | ||
| // See the file LICENSE for licensing terms. | ||
|
|
||
| package timer | ||
|
|
||
| import "time" | ||
|
|
||
| // NewStagedTimer returns a timer that will execute [f] | ||
| // when a timeout occurs and execute an additional timeout after | ||
| // the returned duration if [f] returns true and some duration. | ||
| func NewStagedTimer(f func() (time.Duration, bool)) *Timer { | ||
| t := NewTimer(nil) | ||
| t.handler = func() { | ||
| delay, repeat := f() | ||
| if repeat { | ||
| t.SetTimeoutIn(delay) | ||
| } | ||
| } | ||
| return t | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved. | ||
| // See the file LICENSE for licensing terms. | ||
|
|
||
| package timer | ||
|
|
||
| import ( | ||
| "sync" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestSingleStagedTimer(t *testing.T) { | ||
| wg := sync.WaitGroup{} | ||
| wg.Add(1) | ||
| ticks := 1 | ||
| i := 0 | ||
| timer := NewStagedTimer(func() (time.Duration, bool) { | ||
| defer wg.Done() | ||
| i++ | ||
| return 0, false | ||
| }) | ||
| go timer.Dispatch() | ||
|
|
||
| timer.SetTimeoutIn(time.Millisecond) | ||
| wg.Wait() | ||
| require.Equal(t, i, ticks) | ||
| } | ||
|
|
||
| func TestMultiStageTimer(t *testing.T) { | ||
| wg := sync.WaitGroup{} | ||
| ticks := 3 | ||
| wg.Add(ticks) | ||
|
|
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| i := 0 | ||
| timer := NewStagedTimer(func() (time.Duration, bool) { | ||
| defer wg.Done() | ||
| i++ | ||
| return time.Millisecond, i < ticks | ||
| }) | ||
| go timer.Dispatch() | ||
|
|
||
| timer.SetTimeoutIn(time.Millisecond) | ||
| wg.Wait() | ||
| require.Equal(t, i, ticks) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved. | ||
| // See the file LICENSE for licensing terms. | ||
|
|
||
| package timer | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| // Timer wraps a timer object. This allows a user to specify a handler. Once | ||
| // specifying the handler, the dispatch thread can be called. The dispatcher | ||
| // will only return after calling Stop. SetTimeoutIn will result in calling the | ||
| // handler in the specified amount of time. | ||
| type Timer struct { | ||
| handler func() | ||
| timeout chan struct{} | ||
|
|
||
| lock sync.Mutex | ||
| wg sync.WaitGroup | ||
| finished, shouldExecute bool | ||
| duration time.Duration | ||
| } | ||
|
|
||
| // NewTimer creates a new timer object | ||
| func NewTimer(handler func()) *Timer { | ||
| timer := &Timer{ | ||
| handler: handler, | ||
| timeout: make(chan struct{}, 1), | ||
| } | ||
| timer.wg.Add(1) | ||
|
|
||
| return timer | ||
| } | ||
|
|
||
| // SetTimeoutIn will set the timer to fire the handler in [duration] | ||
| func (t *Timer) SetTimeoutIn(duration time.Duration) { | ||
| t.lock.Lock() | ||
| defer t.lock.Unlock() | ||
|
|
||
| t.duration = duration | ||
| t.shouldExecute = true | ||
| t.reset() | ||
| } | ||
|
|
||
| // Cancel the currently scheduled event | ||
| func (t *Timer) Cancel() { | ||
| t.lock.Lock() | ||
| defer t.lock.Unlock() | ||
|
|
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| t.shouldExecute = false | ||
| t.reset() | ||
| } | ||
|
|
||
| // Stop this timer from executing any more. | ||
| func (t *Timer) Stop() { | ||
| t.lock.Lock() | ||
| if !t.finished { | ||
| defer t.wg.Wait() | ||
| } | ||
| defer t.lock.Unlock() | ||
|
|
||
| t.finished = true | ||
| t.reset() | ||
| } | ||
|
|
||
| func (t *Timer) Dispatch() { | ||
| t.lock.Lock() | ||
| defer t.lock.Unlock() | ||
| defer t.wg.Done() | ||
|
|
||
| timer := time.NewTimer(0) | ||
| cleared := false | ||
| reset := false | ||
| for !t.finished { // t.finished needs to be thread safe | ||
| if !reset && !timer.Stop() && !cleared { | ||
| <-timer.C | ||
| } | ||
|
|
||
| if cleared && t.shouldExecute { | ||
| t.lock.Unlock() | ||
| t.handler() | ||
| } else { | ||
| t.lock.Unlock() | ||
| } | ||
|
|
||
| cleared = false | ||
| reset = false | ||
| select { | ||
| case <-t.timeout: | ||
| t.lock.Lock() | ||
| if t.shouldExecute { | ||
| timer.Reset(t.duration) | ||
| } | ||
| reset = true | ||
| case <-timer.C: | ||
| t.lock.Lock() | ||
| cleared = true | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (t *Timer) reset() { | ||
| select { | ||
| case t.timeout <- struct{}{}: | ||
| default: | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| // Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved. | ||
| // See the file LICENSE for licensing terms. | ||
|
|
||
| package timer | ||
|
|
||
| import ( | ||
| "sync" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func TestTimer(t *testing.T) { | ||
| wg := sync.WaitGroup{} | ||
| wg.Add(1) | ||
| defer wg.Wait() | ||
|
|
||
| timer := NewTimer(wg.Done) | ||
| go timer.Dispatch() | ||
|
|
||
| timer.SetTimeoutIn(time.Millisecond) | ||
| } |
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