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producer.clj
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producer.clj
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(ns ziggurat.messaging.producer
(:require [clojure.tools.logging :as log]
[langohr.basic :as lb]
[langohr.channel :as lch]
[langohr.exchange :as le]
[langohr.queue :as lq]
[sentry-clj.async :as sentry]
[taoensso.nippy :as nippy]
[ziggurat.config :refer [ziggurat-config rabbitmq-config]]
[ziggurat.messaging.connection :refer [connection is-connection-required?]]
[ziggurat.messaging.util :refer :all]
[ziggurat.retry :refer [with-retry]]
[ziggurat.sentry :refer [sentry-reporter]]))
(defn delay-queue-name [topic-entity queue-name]
(prefixed-queue-name topic-entity queue-name))
(defn- create-queue [queue props ch]
(lq/declare ch queue {:durable true :arguments props :auto-delete false})
(log/info "Created queue - " queue))
(defn- declare-exchange [ch exchange]
(le/declare ch exchange "fanout" {:durable true :auto-delete false})
(log/info "Declared exchange - " exchange))
(defn- bind-queue-to-exchange [ch queue exchange]
(lq/bind ch queue exchange)
(log/infof "Bound queue %s to exchange %s" queue exchange))
(defn- create-and-bind-queue
([queue-name exchange]
(create-and-bind-queue queue-name exchange nil))
([queue-name exchange-name dead-letter-exchange]
(try
(let [props (if dead-letter-exchange
{"x-dead-letter-exchange" dead-letter-exchange}
{})]
(let [ch (lch/open connection)]
(create-queue queue-name props ch)
(declare-exchange ch exchange-name)
(bind-queue-to-exchange ch queue-name exchange-name)))
(catch Exception e
(sentry/report-error sentry-reporter e "Error while declaring RabbitMQ queues")
(throw e)))))
(defn- properties-for-publish
[expiration]
(let [props {:content-type "application/octet-stream"
:persistent true}]
(if expiration
(assoc props :expiration (str expiration))
props)))
(defn- publish
([exchange message]
(publish exchange message nil))
([exchange message expiration]
(try
(with-retry {:count 5
:wait 100
:on-failure #(log/error "publishing message to rabbitmq failed with error " (.getMessage %))}
(with-open [ch (lch/open connection)]
(lb/publish ch exchange "" (nippy/freeze message) (properties-for-publish expiration))))
(catch Throwable e
(sentry/report-error sentry-reporter e
"Pushing message to rabbitmq failed, data: " message)))))
(defn publish-to-delay-queue [topic-entity message]
(let [{:keys [exchange-name queue-timeout-ms]} (:delay (rabbitmq-config))
exchange-name (prefixed-queue-name topic-entity exchange-name)]
(publish exchange-name message queue-timeout-ms)))
(defn publish-to-dead-queue [topic-entity message]
(let [{:keys [exchange-name]} (:dead-letter (rabbitmq-config))
exchange-name (prefixed-queue-name topic-entity exchange-name)]
(publish exchange-name message)))
(defn publish-to-instant-queue
[topic-entity message]
(let [{:keys [exchange-name]} (:instant (rabbitmq-config))
exchange-name (prefixed-queue-name topic-entity exchange-name)]
(publish exchange-name message)))
(defn- get-channel-retry-queue-timeout-ms [topic-entity channel]
(-> (ziggurat-config) :stream-router topic-entity :channels channel :retry :queue-timeout-ms))
(defn- channel-retries-exponential-backoff-enabled [topic-entity channel]
"Get exponential backoff enabled for specific channel from config."
(-> (ziggurat-config) :stream-router topic-entity :channels channel :retry :exponential-backoff-enabled))
(defn- channel-retries-enabled [topic-entity channel]
(-> (ziggurat-config) :stream-router topic-entity :channels channel :retry :enabled))
(defn- get-channel-retry-count [topic-entity channel]
(-> (ziggurat-config) :stream-router topic-entity :channels channel :retry :count))
(defn- get-exponential-backoff [retry-count message-retry-count queue-timeout-ms]
"Get queue timeout value when exponential backoff is enabled."
(int (* (- (Math/pow 2 (- retry-count message-retry-count)) 1) queue-timeout-ms)))
(defn get-queue-timeout-ms [topic-entity channel message]
"Get queue timeout from config. It will use channel queue-timeout-ms if defined, otherwise it will use rabbitmq delay queue-timeout-ms.
If exponential-backoff-enabled is true, queue-timeout-ms will be exponential with formula (2^n)-1, n is message retry-count."
(let [queue-timeout-ms (-> (rabbitmq-config) :delay :queue-timeout-ms)
channel-queue-timeout-ms (get-channel-retry-queue-timeout-ms topic-entity channel)
exponential-backoff-enabled (channel-retries-exponential-backoff-enabled topic-entity channel)]
(if exponential-backoff-enabled
(let [retry-count (-> (ziggurat-config) :retry :count)
channel-retry-count (get-channel-retry-count topic-entity channel)
message-retry-count (message :retry-count)]
(get-exponential-backoff (or channel-retry-count retry-count) message-retry-count (or channel-queue-timeout-ms queue-timeout-ms)))
(or channel-queue-timeout-ms queue-timeout-ms))))
(defn publish-to-channel-delay-queue [topic-entity channel message]
(let [{:keys [exchange-name]} (:delay (rabbitmq-config))
exchange-name (prefixed-channel-name topic-entity channel exchange-name)
queue-timeout-ms (get-queue-timeout-ms topic-entity channel message)]
(publish exchange-name message queue-timeout-ms)))
(defn publish-to-channel-custom-delay-queue [topic-entity channel message queue-timeout-ms]
(let [{:keys [exchange-name]} (:delay (rabbitmq-config))
exchange-name (prefixed-channel-name topic-entity channel exchange-name)]
(publish exchange-name message queue-timeout-ms)))
(defn publish-to-channel-dead-queue [topic-entity channel message]
(let [{:keys [exchange-name]} (:dead-letter (rabbitmq-config))
exchange-name (prefixed-channel-name topic-entity channel exchange-name)]
(publish exchange-name message)))
(defn publish-to-channel-instant-queue
[topic-entity channel message]
(let [{:keys [exchange-name]} (:instant (rabbitmq-config))
exchange-name (prefixed-channel-name topic-entity channel exchange-name)]
(publish exchange-name message)))
(defn retry [{:keys [retry-count] :as message} topic-entity]
(when (-> (ziggurat-config) :retry :enabled)
(cond
(nil? retry-count) (publish-to-delay-queue topic-entity (assoc message :retry-count (dec (-> (ziggurat-config) :retry :count))))
(pos? retry-count) (publish-to-delay-queue topic-entity (assoc message :retry-count (dec retry-count)))
(zero? retry-count) (publish-to-dead-queue topic-entity (dissoc message :retry-count)))))
(defn retry-for-channel [{:keys [retry-count] :as message} topic-entity channel]
(when (channel-retries-enabled topic-entity channel)
(cond
(nil? retry-count) (publish-to-channel-delay-queue topic-entity channel (assoc message :retry-count (dec (get-channel-retry-count topic-entity channel))))
(pos? retry-count) (publish-to-channel-delay-queue topic-entity channel (assoc message :retry-count (dec retry-count)))
(zero? retry-count) (publish-to-channel-dead-queue topic-entity channel (dissoc message :retry-count)))))
(defn- make-delay-queue [topic-entity]
(let [{:keys [queue-name exchange-name dead-letter-exchange]} (:delay (rabbitmq-config))
queue-name (delay-queue-name topic-entity queue-name)
exchange-name (prefixed-queue-name topic-entity exchange-name)
dead-letter-exchange-name (prefixed-queue-name topic-entity dead-letter-exchange)]
(create-and-bind-queue queue-name exchange-name dead-letter-exchange-name)))
(defn- make-channel-delay-queue [topic-entity channel]
(make-delay-queue (with-channel-name topic-entity channel)))
(defn- make-queue [topic-identifier queue-type]
(let [{:keys [queue-name exchange-name]} (queue-type (rabbitmq-config))
queue-name (prefixed-queue-name topic-identifier queue-name)
exchange-name (prefixed-queue-name topic-identifier exchange-name)]
(create-and-bind-queue queue-name exchange-name)))
(defn- make-channel-queue [topic-entity channel-name queue-type]
(make-queue (with-channel-name topic-entity channel-name) queue-type))
(defn- make-channel-queues [channels topic-entity]
(doseq [channel channels]
(make-channel-queue topic-entity channel :instant)
(when (channel-retries-enabled topic-entity channel)
(make-channel-delay-queue topic-entity channel)
(make-channel-queue topic-entity channel :dead-letter))))
(defn make-queues [stream-routes]
(when (is-connection-required?)
(doseq [topic-entity (keys stream-routes)]
(let [channels (get-channel-names stream-routes topic-entity)]
(make-channel-queues channels topic-entity)
(when (-> (ziggurat-config) :retry :enabled)
(make-delay-queue topic-entity)
(make-queue topic-entity :instant)
(make-queue topic-entity :dead-letter))))))