author | Matthew Wild <mwild1@gmail.com> |
Thu, 18 Aug 2022 10:36:35 +0100 | |
changeset 5009 | d68348323406 |
parent 4515 | 97fac0ba0469 |
child 5655 | b40750891bee |
permissions | -rw-r--r-- |
4515
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mod_pubsub_subscription: New module providing an API for pubsub subscriptions
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local st = require "util.stanza"; |
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local uuid = require "util.uuid"; |
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local mt = require "util.multitable"; |
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local cache = require "util.cache"; |
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|
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local xmlns_pubsub = "http://jabber.org/protocol/pubsub"; |
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local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event"; |
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|
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-- TODO persist |
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-- TODO query known pubsub nodes to sync current subscriptions |
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-- TODO subscription ids per 'item' would be handy |
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|
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local pending_subscription = cache.new(256); -- uuid → node |
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local pending_unsubscription = cache.new(256); -- uuid → node |
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local active_subscriptions = mt.new() -- service | node | uuid | { item } |
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function module.save() |
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return { active_subscriptions = active_subscriptions.data } |
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end |
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function module.restore(data) |
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if data and data.active_subscriptions then |
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active_subscriptions.data = data.active_subscriptions |
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end |
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end |
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local valid_events = {"subscribed"; "unsubscribed"; "error"; "item"; "retract"; "purge"; "delete"} |
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local function subscription_added(item_event) |
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local item = item_event.item; |
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assert(item.service, "pubsub subscription item MUST have a 'service' field."); |
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assert(item.node, "pubsub subscription item MUST have a 'node' field."); |
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local already_subscibed = false; |
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for _ in active_subscriptions:iter(item.service, item.node, nil) do -- luacheck: ignore 512 |
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already_subscibed = true; |
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break |
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end |
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item._id = uuid.generate(); |
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local iq_id = uuid.generate(); |
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pending_subscription:set(iq_id, item._id); |
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active_subscriptions:set(item.service, item.node, item._id, item); |
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|
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if not already_subscibed then |
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module:send(st.iq({ type = "set", id = iq_id, from = module.host, to = item.service }) |
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:tag("pubsub", { xmlns = xmlns_pubsub }) |
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:tag("subscribe", { jid = module.host, node = item.node })); |
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end |
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end |
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for _, event_name in ipairs(valid_events) do |
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module:hook("pubsub-event/host/"..event_name, function (event) |
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for _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, nil, "on_"..event_name) do |
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pcall(cb, event); |
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end |
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end); |
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end |
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module:hook("iq/host", function (event) |
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local stanza = event.stanza; |
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local service = stanza.attr.from; |
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if not stanza.attr.id then return end -- shouldn't be possible |
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local subscribed_node = pending_subscription:get(stanza.attr.id); |
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pending_subscription:set(stanza.attr.id, nil); |
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local unsubscribed_node = pending_unsubscription:get(stanza.attr.id); |
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pending_unsubscription:set(stanza.attr.id, nil); |
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if stanza.attr.type == "result" then |
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local pubsub_wrapper = stanza:get_child("pubsub", xmlns_pubsub); |
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local subscription = pubsub_wrapper and pubsub_wrapper:get_child("subscription"); |
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if not subscription then return end |
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local node = subscription.attr.node; |
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|
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local what; |
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if subscription.attr.subscription == "subscribed" then |
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what = "on_subscribed"; |
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elseif subscription.attr.subscription == "none" then |
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what = "on_unsubscribed"; |
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end |
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if not what then return end -- there are other states but we don't handle them |
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for _, _, _, _, cb in active_subscriptions:iter(service, node, nil, what) do |
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cb(event); |
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end |
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return true; |
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|
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elseif stanza.attr.type == "error" then |
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local node = subscribed_node or unsubscribed_node; |
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local error_type, error_condition, reason, pubsub_error = stanza:get_error(); |
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local err = { type = error_type, condition = error_condition, text = reason, extra = pubsub_error }; |
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if active_subscriptions:get(service) then |
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for _, _, _, _, cb in active_subscriptions:iter(service, node, nil, "on_error") do |
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cb(err); |
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end |
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return true; |
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end |
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end |
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end, 1); |
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|
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local function subscription_removed(item_event) |
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local item = item_event.item; |
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active_subscriptions:set(item.service, item.node, item._id, nil); |
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local node_subs = active_subscriptions:get(item.service, item.node); |
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if node_subs and next(node_subs) then return end |
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|
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local iq_id = uuid.generate(); |
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pending_unsubscription:set(iq_id, item._id); |
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|
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module:send(st.iq({ type = "set", id = iq_id, from = module.host, to = item.service }) |
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:tag("pubsub", { xmlns = xmlns_pubsub }) |
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:tag("unsubscribe", { jid = module.host, node = item.node })) |
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end |
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|
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module:handle_items("pubsub-subscription", subscription_added, subscription_removed, true); |
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115 |
|
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module:hook("message/host", function(event) |
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local origin, stanza = event.origin, event.stanza; |
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local ret = nil; |
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local service = stanza.attr.from; |
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module:log("debug", "Got message/host: %s", stanza:top_tag()); |
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for event_container in stanza:childtags("event", xmlns_pubsub_event) do |
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for pubsub_event in event_container:childtags() do |
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module:log("debug", "Got pubsub event %s", pubsub_event:top_tag()); |
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local node = pubsub_event.attr.node; |
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module:fire_event("pubsub-event/host/"..pubsub_event.name, { |
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stanza = stanza; |
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origin = origin; |
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event = pubsub_event; |
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service = service; |
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node = node; |
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}); |
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ret = true; |
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end |
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134 |
end |
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return ret; |
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end); |
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|
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module:hook("pubsub-event/host/items", function (event) |
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for item in event.event:childtags() do |
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module:log("debug", "Got pubsub item event %s", item:top_tag()); |
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event.item = item; |
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event.payload = item.tags[1]; |
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module:fire_event("pubsub-event/host/"..item.name, event); |
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end |
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end); |