Mercurial > prosody-modules

annotate mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 3682:47e1c94fb6fb

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mod_muc_media_metadata: Module to automatically fetch metadata for posted media
author Matthew Wild <mwild1@gmail.com>
date Sun, 29 Sep 2019 16:47:57 +0100
parents 7dbde05b48a9
children 6ba2188e2686
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e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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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