101 lines
1.9 KiB
Go
101 lines
1.9 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2021 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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"context"
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"sync"
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)
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type Waiter struct {
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key string
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ch chan bool
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}
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func (w *Waiter) Wait(ctx context.Context) error {
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select {
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case <-w.ch:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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type Notifier struct {
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sync.Mutex
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waiters map[string]*Waiter
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}
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func (n *Notifier) NewWaiter(key string) *Waiter {
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n.Lock()
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defer n.Unlock()
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_, found := n.waiters[key]
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if found {
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panic("already waiting")
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}
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waiter := &Waiter{
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key: key,
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ch: make(chan bool, 1),
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}
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if n.waiters == nil {
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n.waiters = make(map[string]*Waiter)
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}
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n.waiters[key] = waiter
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return waiter
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}
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func (n *Notifier) Reset() {
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n.Lock()
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defer n.Unlock()
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for _, w := range n.waiters {
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close(w.ch)
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}
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n.waiters = nil
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}
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func (n *Notifier) Release(w *Waiter) {
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n.Lock()
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defer n.Unlock()
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if _, found := n.waiters[w.key]; found {
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delete(n.waiters, w.key)
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close(w.ch)
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}
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}
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func (n *Notifier) Notify(key string) {
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n.Lock()
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defer n.Unlock()
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if w, found := n.waiters[key]; found {
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select {
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case w.ch <- true:
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default:
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// Ignore, already notified
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}
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}
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}
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