Annotate

mod_pubsub_eventsource/README.markdown @ 4818:d66162e850cd

mod_export_skeletons: Generate ids based on log2 of the original length
author Kim Alvefur <zash@zash.se>
date Fri, 10 Dec 2021 00:14:12 +0100
parent 1803:4d73a1a6ba68
child 5923:694b62d8a82f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1803
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 ---
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
2 labels: 'Stage-Beta'
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
3 summary: Subscribe to pubsub nodes using the HTML5 EventSource API
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
4 ...
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
5
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
6 Introduction
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
7 ------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
8
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9 [Server-Sent Events](https://en.wikipedia.org/wiki/Server-sent_events)
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10 is a simple HTTP/line-based protocol supported in HTML5, making it easy
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
11 to receive a stream of "events" in realtime using the Javascript
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
12 [EventSource
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
13 API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
14
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
15 EventSource is supported in [most modern
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
16 browsers](http://caniuse.com/#feat=eventsource), and for the remainder
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
17 there are 'polyfill' compatibility layers such as
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
18 [EventSource.js](https://github.com/remy/polyfills/blob/master/EventSource.js)
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
19 and [jquery.eventsource](https://github.com/rwldrn/jquery.eventsource).
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
20
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
21 Details
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
22 -------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24 Subscribing to a node from Javascript is easy:
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
26 var source = new EventSource('http://pubsub.example.org:5280/eventsource/mynode');
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
27 source.onmessage = function (event) {
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
28 console.log(event.data); // Do whatever you want with the data here
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
29 };
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
30
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
31 ### Cross-domain issues
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
32
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
33 The same cross-domain restrictions apply to EventSource that apply to
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
34 BOSH, and support for CORS is not clearly standardized yet. You may want
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
35 to proxy connections through your web server for this reason. See [BOSH:
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
36 Cross-domain
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
37 issues](https://prosody.im/doc/setting_up_bosh#proxying_requests) for
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
38 more information.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
39
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
40 Configuration
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
41 -------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
42
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
43 There is no special configuration for this module. Simply load it onto a
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
44 pubsub component like so:
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
45
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
46 Component "pubsub.example.org" "pubsub"
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
47 modules_enabled = { "pubsub_eventsource" }
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
48
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
49 As it uses HTTP to serve the event streams, you can use Prosody's
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
50 standard [HTTP configuration options](https://prosody.im/doc/http) to
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
51 control how/where the streams are served.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
52
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
53 **Note about URLs:** It is important to get the event streams from the
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
54 correct hostname (that of the pubsub host). An example stream URL is
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
55 `http://pubsub.example.org:5280/eventsource/mynode`. If you need to
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
56 access the streams using another hostname (e.g. `example.org`) you can
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
57 use the `http_host` option under the Component, e.g.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
58 `http_host = "example.org"`. For more information see the ['Virtual
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
59 Hosts'](https://prosody.im/doc/http#virtual_hosts) section of our HTTP
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
60 documentation.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
61
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
62 Compatibility
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
63 -------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
64
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
65 ------- --------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
66 0.9 Works
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
67 0.8 Doesn't work
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
68 Trunk Works
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents:
diff changeset
69 ------- --------------