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98 lines
2.2 KiB
98 lines
2.2 KiB
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2020 struktur AG
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*
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* @author Joachim Bauch <bauch@struktur.de>
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*
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* @license GNU AGPL version 3 or any later version
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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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*/
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package signaling
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import (
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"log"
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"reflect"
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"runtime"
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"runtime/debug"
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"sync"
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)
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// DeferredExecutor will asynchronously execute functions while maintaining
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// their order.
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type DeferredExecutor struct {
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queue chan func()
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closeChan chan bool
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closed chan bool
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closeOnce sync.Once
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}
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func NewDeferredExecutor(queueSize int) *DeferredExecutor {
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if queueSize < 0 {
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queueSize = 0
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}
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result := &DeferredExecutor{
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queue: make(chan func(), queueSize),
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closeChan: make(chan bool, 1),
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closed: make(chan bool, 1),
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}
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go result.run()
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return result
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}
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func (e *DeferredExecutor) run() {
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loop:
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for {
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select {
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case f := <-e.queue:
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if f == nil {
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break loop
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}
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f()
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case <-e.closeChan:
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break loop
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}
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}
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e.closed <- true
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}
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func getFunctionName(i interface{}) string {
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return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
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}
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func (e *DeferredExecutor) Execute(f func()) {
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defer func() {
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if e := recover(); e != nil {
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log.Printf("Could not defer function %v: %+v", getFunctionName(f), e)
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log.Printf("Called from %s", string(debug.Stack()))
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}
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}()
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e.queue <- f
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}
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func (e *DeferredExecutor) Close() {
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select {
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case e.closeChan <- true:
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e.closeOnce.Do(func() {
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close(e.queue)
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})
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default:
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// Already closed.
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}
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}
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func (e *DeferredExecutor) waitForStop() {
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<-e.closed
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}
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