Mercurial > prosody-modules

annotate mod_pubsub_subscription/mod_pubsub_subscription.lua @ 5659:4d1a3de56c3d

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Initial work on Push 2.0
author Stephen Paul Weber <singpolyma@singpolyma.net>
date Tue, 19 Sep 2023 21:21:17 -0500
parents b40750891bee
children
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97fac0ba0469 mod_pubsub_subscription: New module providing an API for pubsub subscriptions
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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);