791353c03b
If the browser supports EventSource switch to use this instead of polling notifications. Signed-off-by: Andrew Thornton art27@cantab.net
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package events
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import (
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"net/http"
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"time"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/eventsource"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/routers/user"
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)
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// Events listens for events
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func Events(ctx *context.Context) {
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// FIXME: Need to check if resp is actually a http.Flusher! - how though?
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// Set the headers related to event streaming.
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ctx.Resp.Header().Set("Content-Type", "text/event-stream")
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ctx.Resp.Header().Set("Cache-Control", "no-cache")
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ctx.Resp.Header().Set("Connection", "keep-alive")
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ctx.Resp.Header().Set("X-Accel-Buffering", "no")
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ctx.Resp.WriteHeader(http.StatusOK)
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// Listen to connection close and un-register messageChan
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notify := ctx.Req.Context().Done()
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ctx.Resp.Flush()
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shutdownCtx := graceful.GetManager().ShutdownContext()
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uid := ctx.User.ID
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messageChan := eventsource.GetManager().Register(uid)
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unregister := func() {
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eventsource.GetManager().Unregister(uid, messageChan)
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// ensure the messageChan is closed
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for {
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_, ok := <-messageChan
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if !ok {
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break
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}
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}
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}
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if _, err := ctx.Resp.Write([]byte("\n")); err != nil {
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log.Error("Unable to write to EventStream: %v", err)
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unregister()
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return
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}
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timer := time.NewTicker(30 * time.Second)
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loop:
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for {
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select {
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case <-timer.C:
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event := &eventsource.Event{
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Name: "ping",
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}
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_, err := event.WriteTo(ctx.Resp)
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if err != nil {
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log.Error("Unable to write to EventStream for user %s: %v", ctx.User.Name, err)
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go unregister()
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break loop
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}
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ctx.Resp.Flush()
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case <-notify:
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go unregister()
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break loop
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case <-shutdownCtx.Done():
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go unregister()
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break loop
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case event, ok := <-messageChan:
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if !ok {
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break loop
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}
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// Handle logout
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if event.Name == "logout" {
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if ctx.Session.ID() == event.Data {
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_, _ = (&eventsource.Event{
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Name: "logout",
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Data: "here",
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}).WriteTo(ctx.Resp)
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ctx.Resp.Flush()
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go unregister()
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user.HandleSignOut(ctx)
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break loop
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}
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// Replace the event - we don't want to expose the session ID to the user
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event = (&eventsource.Event{
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Name: "logout",
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Data: "elsewhere",
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})
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}
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_, err := event.WriteTo(ctx.Resp)
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if err != nil {
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log.Error("Unable to write to EventStream for user %s: %v", ctx.User.Name, err)
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go unregister()
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break loop
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}
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ctx.Resp.Flush()
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}
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}
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timer.Stop()
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}
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