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https://github.com/penpot/penpot.git
synced 2025-03-19 19:21:23 -05:00
✨ Improve msgbus subscription handling.
This commit is contained in:
Andrey Antukh
parent
8fd37dbad5
commit
7e1ee087d3
4 changed files with 194 additions and 124 deletions
backend
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@ -32,9 +32,9 @@
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<AppenderRef ref="main" level="debug" />
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</Logger>
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<Logger name="app" level="debug" additivity="false">
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<AppenderRef ref="main" level="debug" />
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<AppenderRef ref="zmq" level="debug" />
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<Logger name="app" level="trace" additivity="false">
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<AppenderRef ref="main" level="trace" />
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<AppenderRef ref="zmq" level="trace" />
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</Logger>
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<Logger name="user" level="debug" additivity="false">
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@ -62,9 +62,14 @@
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snd-conn (.connect ^RedisClient rclient ^RedisCodec codec)
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rcv-conn (.connectPubSub ^RedisClient rclient ^RedisCodec codec)
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pub-buff (a/chan (a/dropping-buffer buffer-size))
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rcv-buff (a/chan (a/dropping-buffer buffer-size))
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sub-buff (a/chan 1)
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;; Channel used for receive publications from the application.
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pub-chan (a/chan (a/dropping-buffer buffer-size))
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;; Channel used for receive data from redis
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rcv-chan (a/chan (a/dropping-buffer buffer-size))
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;; Channel used for receive subscription requests.
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sub-chan (a/chan)
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cch (a/chan 1)]
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(.setTimeout ^StatefulRedisConnection snd-conn ^Duration (dt/duration {:seconds 10}))
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@ -73,10 +78,10 @@
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(log/debugf "initializing msgbus (uri: '%s')" (str uri))
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;; Start the sending (publishing) loop
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(impl-publish-loop snd-conn pub-buff cch)
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(impl-publish-loop snd-conn pub-chan cch)
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;; Start the receiving (subscribing) loop
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(impl-subscribe-loop rcv-conn rcv-buff sub-buff cch)
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(impl-subscribe-loop rcv-conn rcv-chan sub-chan cch)
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(with-meta
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(fn run
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@ -84,14 +89,14 @@
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([command params]
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(a/go
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(case command
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:pub (a/>! pub-buff params)
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:sub (a/>! sub-buff params)))))
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:pub (a/>! pub-chan params)
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:sub (a/>! sub-chan params)))))
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{::snd-conn snd-conn
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::rcv-conn rcv-conn
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::cch cch
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::pub-buff pub-buff
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::rcv-buff rcv-buff})))
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::pub-chan pub-chan
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::rcv-chan rcv-chan})))
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(defmethod ig/halt-key! ::msgbus
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[_ f]
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@ -99,14 +104,14 @@
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(.close ^StatefulRedisConnection (::snd-conn mdata))
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(.close ^StatefulRedisPubSubConnection (::rcv-conn mdata))
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(a/close! (::cch mdata))
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(a/close! (::pub-buff mdata))
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(a/close! (::rcv-buff mdata))))
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(a/close! (::pub-chan mdata))
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(a/close! (::rcv-chan mdata))))
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(defn- impl-publish-loop
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[conn pub-buff cch]
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[conn pub-chan cch]
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(let [rac (.async ^StatefulRedisConnection conn)]
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(a/go-loop []
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(let [[val _] (a/alts! [cch pub-buff] :priority true)]
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(let [[val _] (a/alts! [cch pub-chan] :priority true)]
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(when (some? val)
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(let [result (a/<! (impl-redis-pub rac val))]
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(when (ex/exception? result)
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@ -114,7 +119,7 @@
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(recur))))))
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(defn- impl-subscribe-loop
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[conn rcv-buff sub-buff cch]
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[conn rcv-chan sub-chan cch]
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;; Add a unique listener to connection
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(.addListener conn (reify RedisPubSubListener
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(message [it pattern topic message])
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@ -122,48 +127,96 @@
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;; There are no back pressure, so we use a slidding
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;; buffer for cases when the pubsub broker sends
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;; more messages that we can process.
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(a/>!! rcv-buff {:topic topic :message (blob/decode message)}))
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(let [val {:topic topic :message (blob/decode message)}]
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(when-not (a/offer! rcv-chan val)
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(log/warn "dropping message on subscription loop"))))
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(psubscribed [it pattern count])
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(punsubscribed [it pattern count])
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(subscribed [it topic count])
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(unsubscribed [it topic count])))
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(a/go-loop [chans {}]
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(let [[val port] (a/alts! [sub-buff cch rcv-buff] :priority true)]
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(cond
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;; Stop condition; just do nothing
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(= port cch)
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nil
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(let [chans (agent {} :error-handler #(log/error % "unexpected error on agent"))
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;; If we receive a message on sub-buff this means that a new
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;; subscription is requested by the notifications module.
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(= port sub-buff)
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(let [topic (:topic val)
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output (:chan val)
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chans (update chans topic (fnil conj #{}) output)]
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(when (= 1 (count (get chans topic)))
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(let [result (a/<! (impl-redis-sub conn topic))]
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(when (ex/exception? result)
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(log/errorf result "unexpected exception on subscribing to '%s'" topic))))
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(recur chans))
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subscribe-to-single-topic
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(fn [nsubs topic chan]
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(let [nsubs (if (nil? nsubs) #{chan} (conj nsubs chan))]
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(when (= 1 (count nsubs))
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(let [result (a/<!! (impl-redis-sub conn topic))]
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(log/tracef "opening subscription to %s" topic)
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(when (ex/exception? result)
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(log/errorf result "unexpected exception on subscribing to '%s'" topic))))
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nsubs))
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;; This means we receive data from redis and we need to
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;; forward it to the underlying subscriptions.
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(= port rcv-buff)
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(let [topic (:topic val)
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pending (loop [chans (seq (get chans topic))
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pending #{}]
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(if-let [ch (first chans)]
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(if (a/>! ch (:message val))
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(recur (rest chans) pending)
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(recur (rest chans) (conj pending ch)))
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pending))
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chans (update chans topic #(reduce disj % pending))]
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(when (empty? (get chans topic))
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(let [result (a/<! (impl-redis-unsub conn topic))]
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(when (ex/exception? result)
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(log/errorf result "unexpected exception on unsubscribing from '%s'" topic))))
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(recur chans))))))
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subscribe-to-topics
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(fn [state topics chan]
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(let [topics (into #{} (map str) topics)
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state (update state :chans assoc chan topics)]
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(reduce (fn [state topic]
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(update-in state [:topics topic] subscribe-to-single-topic topic chan))
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state
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topics)))
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unsubscribe-from-single-topic
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(fn [nsubs topic chan]
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;; (log/tracef "unsubscribe-from-single-topic %s | %s | %s" nsubs topic chan)
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(let [nsubs (disj nsubs chan)]
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(when (empty? nsubs)
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(let [result (a/<!! (impl-redis-unsub conn topic))]
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(log/tracef "closing subscription to %s" topic)
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(when (ex/exception? result)
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(log/errorf result "unexpected exception on unsubscribing from '%s'" topic))))
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nsubs))
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unsubscribe-channels
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(fn [state pending]
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;; (log/tracef "unsubscribe-channels %s" (pr-str pending))
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(reduce (fn [state ch]
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(let [topics (get-in state [:chans ch])
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state (update state :chans dissoc ch)]
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;; (log/tracef "unsubscribe-channels topics=%s" topics)
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(reduce (fn [state topic]
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(update-in state [:topics topic] unsubscribe-from-single-topic topic ch))
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state
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topics)))
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state
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pending))]
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;; Asynchronous subscription loop; terminates when sub-chan is
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;; closed.
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(a/go-loop []
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(when-let [{:keys [topics chan]} (a/<! sub-chan)]
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(send-off chans subscribe-to-topics topics chan)
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(recur)))
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(a/go-loop []
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(let [[val port] (a/alts! [cch rcv-chan])]
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(cond
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;; Stop condition; close all underlying subscriptions and
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;; exit. The close operation is performed asynchronously.
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(= port cch)
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(send-off chans (fn [state]
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(log/tracef "close")
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(->> (vals state)
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(mapcat identity)
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(filter some?)
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(run! a/close!))))
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;; This means we receive data from redis and we need to
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;; forward it to the underlying subscriptions.
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(= port rcv-chan)
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(let [topic (:topic val) ; topic is already string
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pending (loop [chans (seq (get-in @chans [:topics topic]))
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pending #{}]
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(if-let [ch (first chans)]
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(if (a/>! ch (:message val))
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(recur (rest chans) pending)
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(recur (rest chans) (conj pending ch)))
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pending))]
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;; (log/tracef "received message => pending: %s" (pr-str pending))
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(some->> (seq pending)
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(send-off chans unsubscribe-channels))
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(recur)))))))
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(defn- impl-redis-pub
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[rac {:keys [topic message]}]
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@ -115,14 +115,11 @@
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[conn id]
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(db/exec-one! conn [sql:retrieve-file id]))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; WebSocket Http Handler
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; --- WEBSOCKET INIT
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(declare handle-connect)
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(defrecord WebSocket [conn in out sub])
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(defn- ws-send
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[conn data]
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(try
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@ -134,8 +131,8 @@
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(defn websocket
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[{:keys [file-id team-id msgbus executor] :as cfg}]
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(let [in (a/chan (a/dropping-buffer 64))
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out (a/chan (a/dropping-buffer 64))
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(let [rcv-ch (a/chan 32)
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out-ch (a/chan 32)
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mtx-aconn (:mtx-active-connections cfg)
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mtx-messages (:mtx-messages cfg)
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mtx-sessions (:mtx-sessions cfg)
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@ -143,46 +140,51 @@
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ws-send (mtx/wrap-counter ws-send mtx-messages ["send"])]
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(letfn [(on-connect [conn]
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(log/debugf "on-connect %s" (:session-id cfg))
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(mtx-aconn :inc)
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;; A subscription channel should use a lossy buffer
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;; because we can't penalize normal clients when one
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;; slow client is connected to the room.
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(let [sub (a/chan (a/dropping-buffer 64))
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ws (WebSocket. conn in out sub nil cfg)]
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(let [sub-ch (a/chan (a/dropping-buffer 128))
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cfg (assoc cfg
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:conn conn
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:rcv-ch rcv-ch
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:out-ch out-ch
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:sub-ch sub-ch)]
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;; Subscribe to corresponding topics
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(a/<!! (msgbus :sub {:topic (str file-id) :chan sub}))
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(a/<!! (msgbus :sub {:topic (str team-id) :chan sub}))
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(log/tracef "on-connect %s" (:session-id cfg))
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;; message forwarding loop
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;; Forward all messages from out-ch to the websocket
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;; connection
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(a/go-loop []
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(let [val (a/<! out)]
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(let [val (a/<! out-ch)]
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(when (some? val)
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(when (a/<! (aa/thread-call executor #(ws-send conn (t/encode-str val))))
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(recur)))))
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(a/go
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(a/<! (handle-connect ws))
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(a/close! sub))))
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;; Subscribe to corresponding topics
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(a/<! (msgbus :sub {:topics [file-id team-id] :chan sub-ch}))
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(a/<! (handle-connect cfg))
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(a/close! sub-ch))))
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(on-error [_conn _e]
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(log/debugf "on-error %s" (:session-id cfg))
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(on-error [_conn e]
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(mtx-aconn :dec)
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(mtx-sessions :observe (/ (inst-ms (dt/duration-between created-at (dt/now))) 1000.0))
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(a/close! out)
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(a/close! in))
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(log/tracef "on-error %s (%s)" (:session-id cfg) (ex-message e))
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(a/close! out-ch)
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(a/close! rcv-ch))
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(on-close [_conn _status _reason]
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(log/debugf "on-close %s" (:session-id cfg))
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(mtx-aconn :dec)
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(mtx-sessions :observe (/ (inst-ms (dt/duration-between created-at (dt/now))) 1000.0))
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(a/close! out)
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(a/close! in))
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(log/tracef "on-close %s" (:session-id cfg))
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(a/close! out-ch)
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(a/close! rcv-ch))
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(on-message [_ws message]
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(let [message (t/decode-str message)]
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(a/>!! in message)))]
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(when-not (a/offer! rcv-ch message)
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(log/warn "droping ws input message, channe full"))))]
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{:on-connect on-connect
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:on-error on-error
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@ -190,16 +192,18 @@
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:on-text (mtx/wrap-counter on-message mtx-messages ["recv"])
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:on-bytes (constantly nil)})))
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;; --- CONNECTION INIT
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(declare handle-message)
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(declare start-loop!)
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(defn- handle-connect
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[{:keys [conn] :as ws}]
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[{:keys [conn] :as cfg}]
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(a/go
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(try
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(aa/<? (handle-message ws {:type :connect}))
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(aa/<? (start-loop! ws))
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(aa/<? (handle-message ws {:type :disconnect}))
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(aa/<? (handle-message cfg {:type :connect}))
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(aa/<? (start-loop! cfg))
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(aa/<? (handle-message cfg {:type :disconnect}))
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(catch Throwable err
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(log/errorf err "unexpected exception on websocket handler")
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(let [session (.getSession ^WebSocketAdapter conn)]
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@ -207,36 +211,39 @@
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(.disconnect session)))))))
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(defn- start-loop!
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[{:keys [in out sub session-id] :as ws}]
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[{:keys [rcv-ch out-ch sub-ch session-id] :as cfg}]
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(aa/go-try
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(loop []
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(let [timeout (a/timeout 30000)
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[val port] (a/alts! [in sub timeout])]
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[val port] (a/alts! [rcv-ch sub-ch timeout])]
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(cond
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;; Process message coming from connected client
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(and (= port in) (not (nil? val)))
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(and (= port rcv-ch) (some? val))
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(do
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(aa/<? (handle-message ws val))
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(aa/<? (handle-message cfg val))
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(recur))
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;; Forward message to the websocket
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(and (= port sub) (not (nil? val)))
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;; If message comes from subscription channel; we just need
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;; to foreward it to the output channel.
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(and (= port sub-ch) (some? val))
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(do
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(when-not (= (:session-id val) session-id)
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(a/>! out val))
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(a/>! out-ch val))
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(recur))
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;; Timeout channel signaling
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;; When timeout channel is signaled, we need to send a ping
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;; message to the output channel. TODO: we need to make this
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;; more smart.
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(= port timeout)
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(do
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(a/>! out {:type :ping})
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(a/>! out-ch {:type :ping})
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(recur))
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:else
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nil)))))
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;; Incoming Messages Handling
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;; --- PRESENCE HANDLING API
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(def ^:private
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sql:retrieve-presence
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@ -244,12 +251,6 @@
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where file_id=?
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and (clock_timestamp() - updated_at) < '5 min'::interval")
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(defn- retrieve-presence
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[pool file-id]
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(aa/thread-try
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(let [rows (db/exec! pool [sql:retrieve-presence file-id])]
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(mapv (juxt :session-id :profile-id) rows))))
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(def ^:private
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sql:update-presence
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"insert into presence (file_id, session_id, profile_id, updated_at)
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@ -257,49 +258,66 @@
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on conflict (file_id, session_id, profile_id)
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do update set updated_at=clock_timestamp()")
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(defn- retrieve-presence
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[{:keys [pool file-id] :as cfg}]
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(let [rows (db/exec! pool [sql:retrieve-presence file-id])]
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(mapv (juxt :session-id :profile-id) rows)))
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(defn- retrieve-presence*
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[{:keys [executor] :as cfg}]
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(aa/with-thread executor
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(retrieve-presence cfg)))
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(defn- update-presence
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[conn file-id session-id profile-id]
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(aa/thread-try
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(let [sql [sql:update-presence file-id session-id profile-id]]
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(db/exec-one! conn sql))))
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[{:keys [pool file-id session-id profile-id] :as cfg}]
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(let [sql [sql:update-presence file-id session-id profile-id]]
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(db/exec-one! pool sql)))
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(defn- update-presence*
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[{:keys [executor] :as cfg}]
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(aa/with-thread executor
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(update-presence cfg)))
|
||||
|
||||
(defn- delete-presence
|
||||
[pool file-id session-id profile-id]
|
||||
(aa/thread-try
|
||||
(db/delete! pool :presence {:file-id file-id
|
||||
:profile-id profile-id
|
||||
:session-id session-id})))
|
||||
[{:keys [pool file-id session-id profile-id] :as cfg}]
|
||||
(db/delete! pool :presence {:file-id file-id
|
||||
:profile-id profile-id
|
||||
:session-id session-id}))
|
||||
|
||||
(defn- delete-presence*
|
||||
[{:keys [executor] :as cfg}]
|
||||
(aa/with-thread executor
|
||||
(delete-presence cfg)))
|
||||
|
||||
;; --- INCOMING MSG PROCESSING
|
||||
|
||||
(defmulti handle-message
|
||||
(fn [_ message] (:type message)))
|
||||
|
||||
;; TODO: check permissions for join a file-id channel (probably using
|
||||
;; single use token for avoid explicit database query).
|
||||
|
||||
(defmethod handle-message :connect
|
||||
[{:keys [file-id profile-id session-id pool msgbus] :as ws} _message]
|
||||
[{:keys [file-id msgbus] :as cfg} _message]
|
||||
;; (log/debugf "profile '%s' is connected to file '%s'" profile-id file-id)
|
||||
(aa/go-try
|
||||
(aa/<? (update-presence pool file-id session-id profile-id))
|
||||
(let [members (aa/<? (retrieve-presence pool file-id))]
|
||||
(a/<! (msgbus :pub {:topic file-id
|
||||
:message {:type :presence :sessions members}})))))
|
||||
(aa/<? (update-presence* cfg))
|
||||
(let [members (aa/<? (retrieve-presence* cfg))
|
||||
val {:topic file-id :message {:type :presence :sessions members}}]
|
||||
(a/<! (msgbus :pub val)))))
|
||||
|
||||
(defmethod handle-message :disconnect
|
||||
[{:keys [profile-id file-id session-id pool msgbus] :as ws} _message]
|
||||
[{:keys [file-id msgbus] :as cfg} _message]
|
||||
;; (log/debugf "profile '%s' is disconnected from '%s'" profile-id file-id)
|
||||
(aa/go-try
|
||||
(aa/<? (delete-presence pool file-id session-id profile-id))
|
||||
(let [members (aa/<? (retrieve-presence pool file-id))]
|
||||
(a/<! (msgbus :pub {:topic file-id
|
||||
:message {:type :presence :sessions members}})))))
|
||||
(aa/<? (delete-presence* cfg))
|
||||
(let [members (aa/<? (retrieve-presence* cfg))
|
||||
val {:topic file-id :message {:type :presence :sessions members}}]
|
||||
(a/<! (msgbus :pub val)))))
|
||||
|
||||
(defmethod handle-message :keepalive
|
||||
[{:keys [profile-id file-id session-id pool] :as ws} _message]
|
||||
(update-presence pool file-id session-id profile-id))
|
||||
[cfg _message]
|
||||
(update-presence* cfg))
|
||||
|
||||
(defmethod handle-message :pointer-update
|
||||
[{:keys [profile-id file-id session-id msgbus] :as ws} message]
|
||||
[{:keys [profile-id file-id session-id msgbus] :as cfg} message]
|
||||
(let [message (assoc message
|
||||
:profile-id profile-id
|
||||
:session-id session-id)]
|
||||
|
|
|
|||
|
|
@ -46,8 +46,7 @@
|
|||
(fn []
|
||||
(try
|
||||
(let [ret (try (f) (catch Exception e e))]
|
||||
(when-not (nil? ret)
|
||||
(a/>!! c ret)))
|
||||
(when (some? ret) (a/>!! c ret)))
|
||||
(finally
|
||||
(a/close! c)))))
|
||||
c
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue