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https://codeberg.org/forgejo/forgejo.git
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9c5c08859d
- When people click on the logout button, a event is sent to all browser tabs (actually to a shared worker) to notify them of this logout. This is done in a blocking fashion, to ensure every registered channel (which realistically should be one for every user because of the shared worker) for a user receives this message. While doing this, it locks the mutex for the eventsource module. - Codeberg is currently observing a deadlock that's caused by this blocking behavior, a channel isn't receiving the logout event. We currently don't have a good theory of why this is being caused. This in turn is causing that the logout functionality is no longer working and people no longer receive notifications, unless they refresh the page. - This patchs makes this message non-blocking and thus making it consistent with the other messages. We don't see a good reason why this specific event needs to be blocking and the commit introducing it doesn't offer a rationale either.
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package eventsource
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import "sync"
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// Messenger is a per uid message store
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type Messenger struct {
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mutex sync.Mutex
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uid int64
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channels []chan *Event
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}
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// NewMessenger creates a messenger for a particular uid
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func NewMessenger(uid int64) *Messenger {
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return &Messenger{
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uid: uid,
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channels: [](chan *Event){},
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}
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}
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// Register returns a new chan []byte
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func (m *Messenger) Register() <-chan *Event {
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m.mutex.Lock()
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// TODO: Limit the number of messengers per uid
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channel := make(chan *Event, 1)
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m.channels = append(m.channels, channel)
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m.mutex.Unlock()
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return channel
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}
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// Unregister removes the provider chan []byte
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func (m *Messenger) Unregister(channel <-chan *Event) bool {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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for i, toRemove := range m.channels {
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if channel == toRemove {
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m.channels = append(m.channels[:i], m.channels[i+1:]...)
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close(toRemove)
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break
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}
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}
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return len(m.channels) == 0
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}
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// UnregisterAll removes all chan []byte
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func (m *Messenger) UnregisterAll() {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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for _, channel := range m.channels {
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close(channel)
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}
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m.channels = nil
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}
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// SendMessage sends the message to all registered channels
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func (m *Messenger) SendMessage(message *Event) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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for i := range m.channels {
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channel := m.channels[i]
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select {
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case channel <- message:
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default:
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}
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}
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}
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