annotate mod_pubsub_subscription/mod_pubsub_subscription.lua @ 5820:742142f9771e

mod_groups_internal: Fix traceback when room doesn't exist I'm not sure if it should even be included if it doesn't exist, but I'm not currently sure how this situation occurs, so I'm implementing the lightest possible fix for now.
author Matthew Wild <mwild1@gmail.com>
date Thu, 11 Jan 2024 15:53:18 +0000
parents b40750891bee
children
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1 local st = require "util.stanza";
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2 local uuid = require "util.uuid";
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3 local mt = require "util.multitable";
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4 local cache = require "util.cache";
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5
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6 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
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7 local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
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8
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9 -- TODO persist
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10 -- TODO query known pubsub nodes to sync current subscriptions
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11 -- TODO subscription ids per 'item' would be handy
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12
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13 local pending_subscription = cache.new(256); -- uuid → node
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14 local pending_unsubscription = cache.new(256); -- uuid → node
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15 local active_subscriptions = mt.new() -- service | node | subscriber | uuid | { item }
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16 function module.save()
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17 return { active_subscriptions = active_subscriptions.data }
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18 end
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19 function module.restore(data)
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20 if data and data.active_subscriptions then
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21 active_subscriptions.data = data.active_subscriptions
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22 end
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23 end
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24
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25 local valid_events = {"subscribed"; "unsubscribed"; "error"; "item"; "retract"; "purge"; "delete"}
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26
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27 local function subscription_added(item_event)
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28 local item = item_event.item;
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29 assert(item.service, "pubsub subscription item MUST have a 'service' field.");
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30 assert(item.node, "pubsub subscription item MUST have a 'node' field.");
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31 item.from = item.from or module.host;
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32
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33 local already_subscibed = false;
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34 for _ in active_subscriptions:iter(item.service, item.node, item.from, nil) do -- luacheck: ignore 512
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35 already_subscibed = true;
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36 break
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37 end
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38
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39 item._id = uuid.generate();
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40 local iq_id = uuid.generate();
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41 pending_subscription:set(iq_id, item._id);
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42 active_subscriptions:set(item.service, item.node, item.from, item._id, item);
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43
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44 if not already_subscibed then
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45 module:send(st.iq({ type = "set", id = iq_id, from = item.from, to = item.service })
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46 :tag("pubsub", { xmlns = xmlns_pubsub })
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47 :tag("subscribe", { jid = item.from, node = item.node }));
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48 end
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49 end
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50
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51 for _, event_name in ipairs(valid_events) do
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52 module:hook("pubsub-event/host/"..event_name, function (event)
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53 for _, _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, event.stanza.attr.to, nil, "on_"..event_name) do
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54 pcall(cb, event);
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55 end
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56 end);
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57
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58 module:hook("pubsub-event/bare/"..event_name, function (event)
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59 for _, _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, event.stanza.attr.to, nil, "on_"..event_name) do
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60 pcall(cb, event);
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61 end
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62 end);
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63 end
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64
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65 function handle_iq(context, event)
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66 local stanza = event.stanza;
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67 local service = stanza.attr.from;
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68
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69 if not stanza.attr.id then return end -- shouldn't be possible
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70
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71 local subscribed_node = pending_subscription:get(stanza.attr.id);
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72 pending_subscription:set(stanza.attr.id, nil);
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73 local unsubscribed_node = pending_unsubscription:get(stanza.attr.id);
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74 pending_unsubscription:set(stanza.attr.id, nil);
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75
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76 if stanza.attr.type == "result" then
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77 local pubsub_wrapper = stanza:get_child("pubsub", xmlns_pubsub);
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78 local subscription = pubsub_wrapper and pubsub_wrapper:get_child("subscription");
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79 if not subscription then return end
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80 local node = subscription.attr.node;
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81
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82 local what;
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83 if subscription.attr.subscription == "subscribed" then
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84 what = "on_subscribed";
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85 elseif subscription.attr.subscription == "none" then
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86 what = "on_unsubscribed";
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87 end
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88 if not what then return end -- there are other states but we don't handle them
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89 for _, _, _, _, _, cb in active_subscriptions:iter(service, node, stanza.attr.to, nil, what) do
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90 cb(event);
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91 end
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92 return true;
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93
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94 elseif stanza.attr.type == "error" then
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95 local node = subscribed_node or unsubscribed_node;
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96 local error_type, error_condition, reason, pubsub_error = stanza:get_error();
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97 local err = { type = error_type, condition = error_condition, text = reason, extra = pubsub_error };
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98 if active_subscriptions:get(service) then
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99 for _, _, _, _, _, cb in active_subscriptions:iter(service, node, stanza.attr.to, nil, "on_error") do
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100 cb(err);
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101 end
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102 return true;
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103 end
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104 end
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105 end
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106
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107 module:hook("iq/host", function (event)
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108 handle_iq("host", event);
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109 end, 1);
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110
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111 module:hook("iq/bare", function (event)
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112 handle_iq("bare", event);
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113 end, 1);
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114
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115 local function subscription_removed(item_event)
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116 local item = item_event.item;
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117 active_subscriptions:set(item.service, item.node, item.from, item._id, nil);
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118 local node_subs = active_subscriptions:get(item.service, item.node, item.from);
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119 if node_subs and next(node_subs) then return end
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120
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121 local iq_id = uuid.generate();
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122 pending_unsubscription:set(iq_id, item._id);
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123
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124 module:send(st.iq({ type = "set", id = iq_id, from = item.from, to = item.service })
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125 :tag("pubsub", { xmlns = xmlns_pubsub })
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126 :tag("unsubscribe", { jid = item.from, node = item.node }))
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127 end
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128
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129 module:handle_items("pubsub-subscription", subscription_added, subscription_removed, true);
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130
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131 function handle_message(context, event)
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132 local origin, stanza = event.origin, event.stanza;
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133 local ret = nil;
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134 local service = stanza.attr.from;
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135 module:log("debug", "Got message/%s: %s", context, stanza:top_tag());
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136 for event_container in stanza:childtags("event", xmlns_pubsub_event) do
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137 for pubsub_event in event_container:childtags() do
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138 module:log("debug", "Got pubsub event %s", pubsub_event:top_tag());
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139 local node = pubsub_event.attr.node;
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140 module:fire_event("pubsub-event/" .. context .. "/"..pubsub_event.name, {
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141 stanza = stanza;
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142 origin = origin;
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143 event = pubsub_event;
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144 service = service;
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145 node = node;
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146 });
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147 ret = true;
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148 end
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149 end
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150 return ret;
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151 end
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152
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153 module:hook("message/host", function(event)
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154 return handle_message("host", event);
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155 end);
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156
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157 module:hook("message/bare", function(event)
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158 return handle_message("bare", event);
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159 end);
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160
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161
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162 function handle_items(context, event)
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163 for item in event.event:childtags() do
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164 module:log("debug", "Got pubsub item event %s", item:top_tag());
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165 event.item = item;
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166 event.payload = item.tags[1];
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167 module:fire_event("pubsub-event/" .. context .. "/"..item.name, event);
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168 end
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169 end
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170
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171 module:hook("pubsub-event/host/items", function (event)
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172 handle_items("host", event);
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173 end);
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174
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175 module:hook("pubsub-event/bare/items", function (event)
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176 handle_items("bare", event);
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177 end);