Mercurial > prosody-modules
view mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 2712:d89ab70808f6
mod_cloud_notify: fix bug when multiple resources are used
This bug was triggered under the rare circumstances that a message arrived
and one resource was smacks hibernated while the other one(s) were offline.
Then only the hibernated resource but not the offline one(s) (or the other
way round) got notified.
author | tmolitor <thilo@eightysoft.de> |
---|---|
date | Mon, 08 May 2017 18:24:29 +0200 |
parents | 7dbde05b48a9 |
children | 6ba2188e2686 |
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module:set_global(); local mqtt = module:require "mqtt"; local st = require "util.stanza"; local pubsub_services = {}; local pubsub_subscribers = {}; local packet_handlers = {}; function handle_packet(session, packet) module:log("warn", "MQTT packet received! Length: %d", packet.length); for k,v in pairs(packet) do module:log("debug", "MQTT %s: %s", tostring(k), tostring(v)); end local handler = packet_handlers[packet.type]; if not handler then module:log("warn", "Unhandled command: %s", tostring(packet.type)); return; end handler(session, packet); end function packet_handlers.connect(session, packet) session.conn:write(mqtt.serialize_packet{ type = "connack"; data = string.char(0x00, 0x00); }); end function packet_handlers.disconnect(session, packet) session.conn:close(); end function packet_handlers.publish(session, packet) module:log("warn", "PUBLISH to %s", packet.topic); local host, node = packet.topic:match("^([^/]+)/(.+)$"); local pubsub = pubsub_services[host]; if not pubsub then module:log("warn", "Unable to locate host/node: %s", packet.topic); return; end local id = "mqtt"; local ok, err = pubsub:publish(node, true, id, st.stanza("data", { xmlns = "https://prosody.im/protocol/data" }) :text(packet.data) ); if not ok then module:log("warn", "Error publishing MQTT data: %s", tostring(err)); end end function packet_handlers.subscribe(session, packet) for _, topic in ipairs(packet.topics) do module:log("warn", "SUBSCRIBE to %s", topic); local host, node = topic:match("^([^/]+)/(.+)$"); local pubsub = pubsub_subscribers[host]; if not pubsub then module:log("warn", "Unable to locate host/node: %s", topic); return; end local node_subs = pubsub[node]; if not node_subs then node_subs = {}; pubsub[node] = node_subs; end session.subscriptions[topic] = true; node_subs[session] = true; end end function packet_handlers.pingreq(session, packet) session.conn:write(mqtt.serialize_packet{type = "pingresp"}); end local sessions = {}; local mqtt_listener = {}; function mqtt_listener.onconnect(conn) sessions[conn] = { conn = conn; stream = mqtt.new_stream(); subscriptions = {}; }; end function mqtt_listener.onincoming(conn, data) local session = sessions[conn]; if session then local packets = session.stream:feed(data); for i = 1, #packets do handle_packet(session, packets[i]); end end end function mqtt_listener.ondisconnect(conn) local session = sessions[conn]; for topic in pairs(session.subscriptions) do local host, node = topic:match("^([^/]+)/(.+)$"); local subs = pubsub_subscribers[host]; if subs then local node_subs = subs[node]; if node_subs then node_subs[session] = nil; end end end sessions[conn] = nil; module:log("debug", "MQTT client disconnected"); end module:provides("net", { default_port = 1883; listener = mqtt_listener; }); local function tostring_content(item) return tostring(item[1]); end local data_translators = setmetatable({ ["data https://prosody.im/protocol/data"] = tostring_content; ["json urn:xmpp:json:0"] = tostring_content; }, { __index = function () return tostring; end; }); function module.add_host(module) local pubsub_module = hosts[module.host].modules.pubsub if pubsub_module then module:log("debug", "MQTT enabled for %s", module.host); module:depends("pubsub"); pubsub_services[module.host] = assert(pubsub_module.service); local subscribers = {}; pubsub_subscribers[module.host] = subscribers; local function handle_publish(event) -- Build MQTT packet local packet = mqtt.serialize_packet{ type = "publish"; id = "\000\000"; topic = module.host.."/"..event.node; data = data_translators[tostring(event.item.name).." "..tostring(event.item.attr.xmlns)](event.item); }; -- Broadcast to subscribers module:log("debug", "Broadcasting PUBLISH to subscribers of %s/%s", module.host, event.node); for session in pairs(subscribers[event.node] or {}) do session.conn:write(packet); module:log("debug", "Sent to %s", tostring(session)); end end pubsub_services[module.host].events.add_handler("item-published", handle_publish); function module.unload() module:log("debug", "MQTT disabled for %s", module.host); pubsub_module.service.remove_handler("item-published", handle_publish); pubsub_services[module.host] = nil; pubsub_subscribers[module.host] = nil; end end end