101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package model
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import (
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"fmt"
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"time"
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)
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type TaskFunc func()
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type ScheduledTask struct {
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Name string `json:"name"`
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Interval time.Duration `json:"interval"`
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Recurring bool `json:"recurring"`
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function func()
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cancel chan struct{}
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cancelled chan struct{}
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fromNextIntervalTime bool
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}
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func CreateTask(name string, function TaskFunc, timeToExecution time.Duration) *ScheduledTask {
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return createTask(name, function, timeToExecution, false, false)
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}
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func CreateRecurringTask(name string, function TaskFunc, interval time.Duration) *ScheduledTask {
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return createTask(name, function, interval, true, false)
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}
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func CreateRecurringTaskFromNextIntervalTime(name string, function TaskFunc, interval time.Duration) *ScheduledTask {
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return createTask(name, function, interval, true, true)
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}
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func createTask(name string, function TaskFunc, interval time.Duration, recurring bool, fromNextIntervalTime bool) *ScheduledTask {
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task := &ScheduledTask{
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Name: name,
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Interval: interval,
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Recurring: recurring,
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function: function,
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cancel: make(chan struct{}),
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cancelled: make(chan struct{}),
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fromNextIntervalTime: fromNextIntervalTime,
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}
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go func() {
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defer close(task.cancelled)
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var firstTick <-chan time.Time
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var ticker *time.Ticker
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if task.fromNextIntervalTime {
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currTime := time.Now()
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first := currTime.Truncate(interval)
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if first.Before(currTime) {
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first = first.Add(interval)
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}
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firstTick = time.After(time.Until(first))
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ticker = &time.Ticker{C: nil}
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} else {
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firstTick = nil
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ticker = time.NewTicker(interval)
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}
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defer func() {
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ticker.Stop()
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}()
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for {
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select {
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case <-firstTick:
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ticker = time.NewTicker(interval)
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function()
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case <-ticker.C:
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function()
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case <-task.cancel:
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return
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}
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if !task.Recurring {
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break
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}
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}
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}()
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return task
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}
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func (task *ScheduledTask) Cancel() {
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close(task.cancel)
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<-task.cancelled
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}
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func (task *ScheduledTask) String() string {
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return fmt.Sprintf(
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"%s\nInterval: %s\nRecurring: %t\n",
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task.Name,
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task.Interval.String(),
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task.Recurring,
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)
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}
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