prosody-modules
da151f9af861
mod_pubsub_mqtt/mod_pubsub_mqtt.lua

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mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 4980:da151f9af861

replaced 'session' with 'origin' in push_disable session is not defined in this function, trying to access it leads to an error. The correct reference seems to be 'origin'. (This may have come about by copying from the similar code in process_stanza_queue.)
author arcseconds
date Sat, 30 Jul 2022 21:07:47 +1200
parent 1343:7dbde05b48a9
child 5111:6ba2188e2686
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
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1 module:set_global();
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2
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3 local mqtt = module:require "mqtt";
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4 local st = require "util.stanza";
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5
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6 local pubsub_services = {};
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7 local pubsub_subscribers = {};
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8 local packet_handlers = {};
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9
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10 function handle_packet(session, packet)
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11 module:log("warn", "MQTT packet received! Length: %d", packet.length);
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12 for k,v in pairs(packet) do
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13 module:log("debug", "MQTT %s: %s", tostring(k), tostring(v));
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14 end
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15 local handler = packet_handlers[packet.type];
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16 if not handler then
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17 module:log("warn", "Unhandled command: %s", tostring(packet.type));
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18 return;
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19 end
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20 handler(session, packet);
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21 end
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22
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23 function packet_handlers.connect(session, packet)
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24 session.conn:write(mqtt.serialize_packet{
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25 type = "connack";
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26 data = string.char(0x00, 0x00);
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27 });
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28 end
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29
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30 function packet_handlers.disconnect(session, packet)
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31 session.conn:close();
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32 end
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33
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34 function packet_handlers.publish(session, packet)
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35 module:log("warn", "PUBLISH to %s", packet.topic);
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36 local host, node = packet.topic:match("^([^/]+)/(.+)$");
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37 local pubsub = pubsub_services[host];
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38 if not pubsub then
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39 module:log("warn", "Unable to locate host/node: %s", packet.topic);
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40 return;
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41 end
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42 local id = "mqtt";
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43 local ok, err = pubsub:publish(node, true, id,
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44 st.stanza("data", { xmlns = "https://prosody.im/protocol/data" })
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45 :text(packet.data)
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46 );
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47 if not ok then
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48 module:log("warn", "Error publishing MQTT data: %s", tostring(err));
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49 end
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50 end
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51
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52 function packet_handlers.subscribe(session, packet)
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53 for _, topic in ipairs(packet.topics) do
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54 module:log("warn", "SUBSCRIBE to %s", topic);
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55 local host, node = topic:match("^([^/]+)/(.+)$");
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56 local pubsub = pubsub_subscribers[host];
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57 if not pubsub then
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58 module:log("warn", "Unable to locate host/node: %s", topic);
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59 return;
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60 end
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61 local node_subs = pubsub[node];
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62 if not node_subs then
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63 node_subs = {};
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64 pubsub[node] = node_subs;
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65 end
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66 session.subscriptions[topic] = true;
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67 node_subs[session] = true;
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68 end
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69
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70 end
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71
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72 function packet_handlers.pingreq(session, packet)
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73 session.conn:write(mqtt.serialize_packet{type = "pingresp"});
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74 end
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75
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76 local sessions = {};
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77
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78 local mqtt_listener = {};
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79
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80 function mqtt_listener.onconnect(conn)
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81 sessions[conn] = {
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82 conn = conn;
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83 stream = mqtt.new_stream();
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84 subscriptions = {};
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85 };
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86 end
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87
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88 function mqtt_listener.onincoming(conn, data)
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89 local session = sessions[conn];
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90 if session then
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91 local packets = session.stream:feed(data);
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92 for i = 1, #packets do
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93 handle_packet(session, packets[i]);
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94 end
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95 end
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96 end
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97
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98 function mqtt_listener.ondisconnect(conn)
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99 local session = sessions[conn];
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100 for topic in pairs(session.subscriptions) do
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101 local host, node = topic:match("^([^/]+)/(.+)$");
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102 local subs = pubsub_subscribers[host];
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103 if subs then
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104 local node_subs = subs[node];
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105 if node_subs then
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106 node_subs[session] = nil;
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107 end
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108 end
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109 end
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110 sessions[conn] = nil;
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111 module:log("debug", "MQTT client disconnected");
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112 end
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113
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114 module:provides("net", {
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115 default_port = 1883;
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116 listener = mqtt_listener;
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117 });
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118
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119 local function tostring_content(item)
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120 return tostring(item[1]);
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121 end
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122
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123 local data_translators = setmetatable({
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124 ["data https://prosody.im/protocol/data"] = tostring_content;
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125 ["json urn:xmpp:json:0"] = tostring_content;
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126 }, {
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127 __index = function () return tostring; end;
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128 });
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129
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130 function module.add_host(module)
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131 local pubsub_module = hosts[module.host].modules.pubsub
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132 if pubsub_module then
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133 module:log("debug", "MQTT enabled for %s", module.host);
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134 module:depends("pubsub");
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135 pubsub_services[module.host] = assert(pubsub_module.service);
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136 local subscribers = {};
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137 pubsub_subscribers[module.host] = subscribers;
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138 local function handle_publish(event)
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139 -- Build MQTT packet
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140 local packet = mqtt.serialize_packet{
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141 type = "publish";
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142 id = "\000\000";
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143 topic = module.host.."/"..event.node;
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144 data = data_translators[tostring(event.item.name).." "..tostring(event.item.attr.xmlns)](event.item);
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145 };
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146 -- Broadcast to subscribers
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147 module:log("debug", "Broadcasting PUBLISH to subscribers of %s/%s", module.host, event.node);
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148 for session in pairs(subscribers[event.node] or {}) do
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149 session.conn:write(packet);
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150 module:log("debug", "Sent to %s", tostring(session));
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151 end
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152 end
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153 pubsub_services[module.host].events.add_handler("item-published", handle_publish);
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154 function module.unload()
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155 module:log("debug", "MQTT disabled for %s", module.host);
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156 pubsub_module.service.remove_handler("item-published", handle_publish);
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157 pubsub_services[module.host] = nil;
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158 pubsub_subscribers[module.host] = nil;
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159 end
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160 end
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161 end