# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1353004073 18000
# Node ID 28dba960849966b0d13f54d8b82fb436b1ecefc0
# Parent  1393af36ec9cf9fe624f171bf311df6df366d0e5
mod_pubsub_eventsource: An experimental plugin for allowing non-XMPP subscriptions to pubsub nodes over HTML5's server-sent events (SSE/EventSource) API

diff -r 1393af36ec9c -r 28dba9608499 mod_pubsub_eventsource/mod_pubsub_eventsource.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_pubsub_eventsource/mod_pubsub_eventsource.lua	Thu Nov 15 13:27:53 2012 -0500
@@ -0,0 +1,59 @@
+module:depends("http");
+module:depends("pubsub");
+
+local streams = {};
+
+local service = hosts[module.host].modules.pubsub.service;
+
+function client_closed(response)
+	local node = response._eventsource_node;
+	module:log("debug", "Destroying client for %q", node);
+	streams[node][response] = nil;
+	if next(streams[node]) == nil then
+		streams[node] = nil;
+	end
+end
+
+function serve_stream(event, node)
+	module:log("debug", "Client subscribed to: %s", node);
+
+	local response = event.response;
+	response.on_destroy = client_closed;
+	response._eventsource_node = node;
+
+	response.conn:write(table.concat({
+		"HTTP/1.1 200 OK";
+		"Content-Type: text/event-stream";
+		"";
+		"";	
+	}, "\r\n"));
+
+	local clientlist = streams[node];
+	if not clientlist then
+		clientlist = {};
+		streams[node] = clientlist;
+	end
+	clientlist[response] = response.conn;
+
+	return true;
+end
+
+function handle_update(event)
+	module:log("debug", "Item published: %q", event.node);
+	local node = event.node;
+	local clientlist = streams[node];
+	local data = "data: "..tostring(event.item):gsub("\n", "\ndata: \n").."\n\n";
+	if not clientlist then module:log("debug", "No clients for %q", node); return; end
+	for response, conn in pairs(clientlist) do
+		conn:write(data);
+	end
+end
+
+module:provides("http", {
+	name = "eventsource";
+	route = {
+		["GET /*"] = serve_stream;
+	};
+});
+
+module:hook_object_event(service.events, "item-published", handle_update);