mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-21 00:21:59 +03:00
129 lines
3.4 KiB
Go
129 lines
3.4 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package scheduler
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
"time"
|
|
|
|
"codeberg.org/gruf/go-runners"
|
|
"codeberg.org/gruf/go-sched"
|
|
)
|
|
|
|
// Scheduler wraps an underlying scheduler to provide
|
|
// task tracking by unique string identifiers, so jobs
|
|
// may be cancelled with only an identifier.
|
|
type Scheduler struct {
|
|
sch sched.Scheduler
|
|
ts map[string]*task
|
|
mu sync.Mutex
|
|
}
|
|
|
|
// Start attempts to start the scheduler. Returns false if already running.
|
|
func (sch *Scheduler) Start() bool {
|
|
if sch.sch.Start(nil) {
|
|
sch.ts = make(map[string]*task)
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Stop attempts to stop scheduler, cancelling
|
|
// all running tasks. Returns false if not running.
|
|
func (sch *Scheduler) Stop() bool {
|
|
if sch.sch.Stop() {
|
|
sch.ts = nil
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// AddOnce schedules the given task to run at time, registered under the given ID. Returns false if task already exists for id.
|
|
func (sch *Scheduler) AddOnce(id string, start time.Time, fn func(context.Context, time.Time)) bool {
|
|
return sch.schedule(id, fn, (*sched.Once)(&start))
|
|
}
|
|
|
|
// AddRecurring schedules the given task to return at given period, starting at given time, registered under given id. Returns false if task already exists for id.
|
|
func (sch *Scheduler) AddRecurring(id string, start time.Time, freq time.Duration, fn func(context.Context, time.Time)) bool {
|
|
return sch.schedule(id, fn, &sched.PeriodicAt{Once: sched.Once(start), Period: sched.Periodic(freq)})
|
|
}
|
|
|
|
// Cancel attempts to cancel a scheduled task with id, returns false if no task found.
|
|
func (sch *Scheduler) Cancel(id string) bool {
|
|
// Attempt to acquire and
|
|
// delete task with iD.
|
|
sch.mu.Lock()
|
|
task, ok := sch.ts[id]
|
|
delete(sch.ts, id)
|
|
sch.mu.Unlock()
|
|
|
|
if !ok {
|
|
// none found.
|
|
return false
|
|
}
|
|
|
|
// Cancel the queued
|
|
// job from Scheduler.
|
|
task.cncl()
|
|
return true
|
|
}
|
|
|
|
func (sch *Scheduler) schedule(id string, fn func(context.Context, time.Time), t sched.Timing) bool {
|
|
if fn == nil {
|
|
panic("nil function")
|
|
}
|
|
|
|
// Perform within lock.
|
|
sch.mu.Lock()
|
|
defer sch.mu.Unlock()
|
|
|
|
if _, ok := sch.ts[id]; ok {
|
|
// existing task already
|
|
// exists under this ID.
|
|
return false
|
|
}
|
|
|
|
// Extract current sched context.
|
|
doneCh := sch.sch.Done()
|
|
ctx := runners.CancelCtx(doneCh)
|
|
|
|
// Create a new job to hold task function with
|
|
// timing, passing in the current sched context.
|
|
job := sched.NewJob(func(now time.Time) {
|
|
fn(ctx, now)
|
|
})
|
|
job.With(t)
|
|
|
|
// Queue job with the scheduler,
|
|
// and store a new encompassing task.
|
|
cncl := sch.sch.Schedule(job)
|
|
sch.ts[id] = &task{
|
|
job: job,
|
|
cncl: cncl,
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// task simply wraps together a scheduled
|
|
// job, and the matching cancel function.
|
|
type task struct {
|
|
job *sched.Job
|
|
cncl func()
|
|
}
|