Mercurial > prosody-modules

annotate mod_pubsub_subscription/mod_pubsub_subscription.lua @ 4877:adc6241e5d16

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mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100
parents 97fac0ba0469
children b40750891bee
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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 | 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
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32 local already_subscibed = false;
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33 for _ in active_subscriptions:iter(item.service, item.node, nil) do -- luacheck: ignore 512
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34 already_subscibed = true;
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35 break
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36 end
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37
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38 item._id = uuid.generate();
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39 local iq_id = uuid.generate();
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40 pending_subscription:set(iq_id, item._id);
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41 active_subscriptions:set(item.service, item.node, item._id, item);
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42
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43 if not already_subscibed then
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44 module:send(st.iq({ type = "set", id = iq_id, from = module.host, to = item.service })
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45 :tag("pubsub", { xmlns = xmlns_pubsub })
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46 :tag("subscribe", { jid = module.host, node = item.node }));
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47 end
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48 end
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49
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50 for _, event_name in ipairs(valid_events) do
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51 module:hook("pubsub-event/host/"..event_name, function (event)
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52 for _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, nil, "on_"..event_name) do
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53 pcall(cb, event);
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54 end
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55 end);
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56 end
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57
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58 module:hook("iq/host", function (event)
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59 local stanza = event.stanza;
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60 local service = stanza.attr.from;
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61
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62 if not stanza.attr.id then return end -- shouldn't be possible
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63
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64 local subscribed_node = pending_subscription:get(stanza.attr.id);
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65 pending_subscription:set(stanza.attr.id, nil);
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66 local unsubscribed_node = pending_unsubscription:get(stanza.attr.id);
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67 pending_unsubscription:set(stanza.attr.id, nil);
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68
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69 if stanza.attr.type == "result" then
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70 local pubsub_wrapper = stanza:get_child("pubsub", xmlns_pubsub);
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71 local subscription = pubsub_wrapper and pubsub_wrapper:get_child("subscription");
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72 if not subscription then return end
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73 local node = subscription.attr.node;
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74
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75 local what;
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76 if subscription.attr.subscription == "subscribed" then
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77 what = "on_subscribed";
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78 elseif subscription.attr.subscription == "none" then
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79 what = "on_unsubscribed";
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80 end
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81 if not what then return end -- there are other states but we don't handle them
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82 for _, _, _, _, cb in active_subscriptions:iter(service, node, nil, what) do
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83 cb(event);
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84 end
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85 return true;
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86
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87 elseif stanza.attr.type == "error" then
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88 local node = subscribed_node or unsubscribed_node;
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89 local error_type, error_condition, reason, pubsub_error = stanza:get_error();
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90 local err = { type = error_type, condition = error_condition, text = reason, extra = pubsub_error };
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91 if active_subscriptions:get(service) then
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92 for _, _, _, _, cb in active_subscriptions:iter(service, node, nil, "on_error") do
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93 cb(err);
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94 end
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95 return true;
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96 end
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97 end
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98 end, 1);
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99
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100 local function subscription_removed(item_event)
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101 local item = item_event.item;
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102 active_subscriptions:set(item.service, item.node, item._id, nil);
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103 local node_subs = active_subscriptions:get(item.service, item.node);
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104 if node_subs and next(node_subs) then return end
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105
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106 local iq_id = uuid.generate();
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107 pending_unsubscription:set(iq_id, item._id);
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108
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109 module:send(st.iq({ type = "set", id = iq_id, from = module.host, to = item.service })
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110 :tag("pubsub", { xmlns = xmlns_pubsub })
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111 :tag("unsubscribe", { jid = module.host, node = item.node }))
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112 end
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113
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114 module:handle_items("pubsub-subscription", subscription_added, subscription_removed, true);
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115
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116 module:hook("message/host", function(event)
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117 local origin, stanza = event.origin, event.stanza;
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118 local ret = nil;
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119 local service = stanza.attr.from;
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120 module:log("debug", "Got message/host: %s", stanza:top_tag());
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121 for event_container in stanza:childtags("event", xmlns_pubsub_event) do
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122 for pubsub_event in event_container:childtags() do
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123 module:log("debug", "Got pubsub event %s", pubsub_event:top_tag());
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124 local node = pubsub_event.attr.node;
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125 module:fire_event("pubsub-event/host/"..pubsub_event.name, {
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126 stanza = stanza;
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127 origin = origin;
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128 event = pubsub_event;
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129 service = service;
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130 node = node;
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131 });
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132 ret = true;
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133 end
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134 end
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135 return ret;
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136 end);
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137
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138 module:hook("pubsub-event/host/items", function (event)
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139 for item in event.event:childtags() do
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140 module:log("debug", "Got pubsub item event %s", item:top_tag());
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141 event.item = item;
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142 event.payload = item.tags[1];
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143 module:fire_event("pubsub-event/host/"..item.name, event);
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144 end
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145 end);