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annotate mod_pubsub_feed/mod_pubsub_feed.lua @ 278:653c1826739e

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mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
author Kim Alvefur <zash@zash.se>
date Sat, 27 Nov 2010 04:14:53 +0100
parents
children aa0df3db4901
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653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
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1 -- Fetches Atom feeds and publishes to PubSub nodes
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
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2 --
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
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3 -- Config:
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4 -- Component "pubsub.example.com" "pubsub"
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5 -- modules_enabled = {
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6 -- "pubsub_feed";
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7 -- }
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Kim Alvefur <zash@zash.se>
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8 -- feeds = { -- node -> url
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9 -- telecomix = "https://status.telecomix.org/api/statuses/public_timeline.atom";
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10 -- }
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11 -- feed_pull_interval = 20 -- minutes
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12
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Kim Alvefur <zash@zash.se>
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13 local modules = hosts[module.host].modules;
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14 if not modules.pubsub then
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15 module:log("warn", "Pubsub needs to be loaded on this host");
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16 end
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17 local add_task = require "util.timer".add_task;
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18 local date, time = os.date, os.time;
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19 local dt_parse = require "util.datetime".parse;
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20 local http = require "net.http";
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21 local parse_feed = require "feeds".feed_from_string;
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22
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23 local config = module:get_option("feeds") or {
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24 planet_jabber = "http://planet.jabber.org/atom.xml";
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25 prosody_blog = "http://blog.prosody.im/feed/atom.xml";
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26 };
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27 local refresh_interval = (module:get_option("feed_pull_interval") or 15) * 60;
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28 local feed_list = { }
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29 for node, url in pairs(config) do
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30 feed_list[node] = { url = url };
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31 end
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32
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33 local function update(item, callback)
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34 local headers = { };
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35 if item.data and item.last_update then
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36 headers["If-Modified-Since"] = date("!%a, %d %b %Y %T %Z", item.last_update);
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37 end
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38 http.request(item.url, {headers = headers}, function(data, code, req)
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39 if code == 200 then
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40 item.data = data;
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41 callback(item)
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42 item.last_update = time();
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43 end
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44 if code == 304 then
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45 item.last_update = time();
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46 end
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47 end);
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48 end
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49
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50 local actor = module.host.."/"..module.name;
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51
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52 local function refresh_feeds()
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53 for node, item in pairs(feed_list) do
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54 update(item, function(item)
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55 local feed = parse_feed(item.data);
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56 module:log("debug", "node: %s", node);
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57 for _, entry in ipairs(feed) do
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58 entry.attr.xmlns = "http://www.w3.org/2005/Atom";
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59
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60 local e_published = entry:get_child("published");
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61 e_published = e_published and e_published[1];
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62 e_published = e_published and dt_parse(e_published);
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63 local e_updated = entry:get_child("updated");
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64 e_updated = e_updated and e_updated[1];
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65 e_updated = e_updated and dt_parse(e_updated);
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66
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67 local timestamp = e_published or e_updated or nil;
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68 module:log("debug", "timestamp is %s, item.last_update is %s", tostring(timestamp), tostring(item.last_update));
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69 if not timestamp or not item.last_update or timestamp > item.last_update then
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70 local id = entry:get_child("id");
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71 id = id[1] or item.url.."#"..timestamp;
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72 module:log("debug", "publishing to %s, id %s", node, id);
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73 modules.pubsub.service:publish(node, actor, id, entry)
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74 end
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75 end
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76 end);
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77 end
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Kim Alvefur <zash@zash.se>
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78 return refresh_interval;
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79 end
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80
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Kim Alvefur <zash@zash.se>
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81 function init()
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82 add_task(0, refresh_feeds);
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83 end
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84
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Kim Alvefur <zash@zash.se>
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85 if prosody.start_time then -- already started
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86 init();
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87 else
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88 prosody.events.add_handler("server-started", init);
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89 end
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90