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annotate mod_pubsub_eventsource/mod_pubsub_eventsource.lua @ 5668:ecfd7aece33b

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mod_measure_modules: Report module statuses via OpenMetrics Someone in the chat asked about a health check endpoint, which reminded me of mod_http_status, which provides access to module statuses with full details. After that, this idea came about, which seems natural. As noted in the README, it could be used to monitor that critical modules are in fact loaded correctly. As more modules use the status API, the more useful this module and mod_http_status becomes.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Oct 2023 18:34:39 +0200
parents 0329cf8cdecb
children
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28dba9608499 mod_pubsub_eventsource: An experimental plugin for allowing non-XMPP subscriptions to pubsub nodes over HTML5's server-sent events (SSE/EventSource) API
Matthew Wild <mwild1@gmail.com>
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1 module:depends("http");
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2 module:depends("pubsub");
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4 local streams = {};
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6 local service = hosts[module.host].modules.pubsub.service;
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8 function client_closed(response)
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9 local node = response._eventsource_node;
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10 module:log("debug", "Destroying client for %q", node);
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11 streams[node][response] = nil;
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12 if next(streams[node]) == nil then
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13 streams[node] = nil;
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14 end
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15 end
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17 function serve_stream(event, node)
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18 module:log("debug", "Client subscribed to: %s", node);
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20 local response = event.response;
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21 response.on_destroy = client_closed;
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22 response._eventsource_node = node;
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24 response.conn:write(table.concat({
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25 "HTTP/1.1 200 OK";
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26 "Content-Type: text/event-stream";
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27 "Access-Control-Allow-Origin: *";
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28 "Access-Control-Allow-Methods: GET";
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29 "Access-Control-Max-Age: 7200";
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30 "";
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31 "";
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32 }, "\r\n"));
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34 local clientlist = streams[node];
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35 if not clientlist then
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36 clientlist = {};
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37 streams[node] = clientlist;
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38 end
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39 clientlist[response] = response.conn;
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41 return true;
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42 end
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44 function handle_update(event)
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45 module:log("debug", "Item published: %q", event.node);
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46 local node = event.node;
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47 local clientlist = streams[node];
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48 local item = event.item;
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49 if (item.name == "json" and item.attr.xmlns == "urn:xmpp:json:0") or (item.name == "data" and item.attr.xmlns == "https://prosody.im/protocol/data") then
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50 item = item[1];
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51 end
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52 local data = "data: "..tostring(item):gsub("\n", "\ndata: ").."\n\n";
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53 if not clientlist then module:log("debug", "No clients for %q", node); return; end
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54 for response, conn in pairs(clientlist) do
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55 conn:write(data);
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56 end
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57 end
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59 module:provides("http", {
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60 name = "eventsource";
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61 route = {
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62 ["GET /*"] = serve_stream;
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63 };
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64 });
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66 module:hook_object_event(service.events, "item-published", handle_update);