143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package workers
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import (
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"context"
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"codeberg.org/gruf/go-runners"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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"github.com/superseriousbusiness/gotosocial/internal/queue"
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"github.com/superseriousbusiness/gotosocial/internal/util"
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)
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// FnWorkerPool wraps multiple FnWorker{}s in
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// a singular struct for easy multi start / stop.
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type FnWorkerPool struct {
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// Queue is embedded queue.SimpleQueue{}
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// passed to each of the pool Worker{}s.
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Queue queue.SimpleQueue[func(context.Context)]
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// internal fields.
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workers []*FnWorker
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}
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// Start will attempt to start 'n' FnWorker{}s.
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func (p *FnWorkerPool) Start(n int) {
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// Check whether workers are
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// set (is already running).
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ok := (len(p.workers) > 0)
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if ok {
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return
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}
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// Allocate new workers slice.
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p.workers = make([]*FnWorker, n)
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for i := range p.workers {
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// Allocate new FnWorker{}.
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p.workers[i] = new(FnWorker)
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p.workers[i].Queue = &p.Queue
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// Attempt to start worker.
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// Return bool not useful
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// here, as true = started,
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// false = already running.
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_ = p.workers[i].Start()
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}
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}
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// Stop will attempt to stop contained FnWorker{}s.
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func (p *FnWorkerPool) Stop() {
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// Check whether workers are
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// set (is currently running).
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ok := (len(p.workers) == 0)
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if ok {
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return
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}
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// Stop all running workers.
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for i := range p.workers {
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// return bool not useful
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// here, as true = stopped,
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// false = never running.
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_ = p.workers[i].Stop()
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}
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// Unset workers slice.
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p.workers = p.workers[:0]
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}
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// FnWorker wraps a queue.SimpleQueue{} which
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// it feeds from to provide it with function
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// tasks to execute. It does so in a single
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// goroutine with state management utilities.
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type FnWorker struct {
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// Queue is the fn queue that FnWorker
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// will feed from for upcoming tasks.
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Queue *queue.SimpleQueue[func(context.Context)]
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// internal fields.
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service runners.Service
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}
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// Start will attempt to start the Worker{}.
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func (w *FnWorker) Start() bool {
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return w.service.GoRun(w.run)
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}
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// Stop will attempt to stop the Worker{}.
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func (w *FnWorker) Stop() bool {
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return w.service.Stop()
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}
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// run wraps process to restart on any panic.
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func (w *FnWorker) run(ctx context.Context) {
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if w.Queue == nil {
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panic("not yet initialized")
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}
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log.Infof(ctx, "%p: starting worker", w)
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defer log.Infof(ctx, "%p: stopped worker", w)
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util.Must(func() { w.process(ctx) })
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}
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// process is the main delivery worker processing routine.
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func (w *FnWorker) process(ctx context.Context) {
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if w.Queue == nil {
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// we perform this check here just
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// to ensure the compiler knows these
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// variables aren't nil in the loop,
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// even if already checked by caller.
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panic("not yet initialized")
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}
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for {
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// Block until pop next func.
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fn, ok := w.Queue.PopCtx(ctx)
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if !ok {
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return
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}
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// run!
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fn(ctx)
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}
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}
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