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(ns chameleon.event
(:require [integrant.core :as ig]
[clojure.string :refer [starts-with?]]
[chameleon.logging :as log]
[clojure.core.async :as ca]
[chameleon.kafka :as ck])
(:import [org.onap.aai.event.client DMaaPEventConsumer KafkaEventConsumer]))
(declare from-dmaap from-kafka)
(defmethod ig/init-key :chameleon/event
[_ {:keys [event-config gallifrey-host loggers]}]
(case (:source event-config)
:dmaap (from-dmaap event-config gallifrey-host loggers)
:kafka (from-kafka event-config gallifrey-host loggers)
:error))
(defn- from-dmaap
[event-config gallifrey-host loggers]
(let [{:keys [host topic motsid pass consumer-group consumer-id timeout batch-size type processor]} (:aai event-config)
[error-logger audit-logger] loggers
event-processor (DMaaPEventConsumer. host topic motsid pass consumer-group consumer-id timeout batch-size type)]
(log/info error-logger "EVENT_PROCESSOR" [(format "AAI created. Starting event polling on %s %s" host topic) ])
(.start (Thread. (fn [] (while true
(let [it (.iterator (.consume event-processor))]
(log/info error-logger "EVENT_PROCESSOR" ["Polling ..."])
(while (.hasNext it)
(log/mdc-init! "SPIKE-EVENT" "CHAMELEON" "" "" gallifrey-host)
(try (let [event (.next it)]
;;Temporarily added for current version of dmaap client
(when-not (starts-with? event "DMAAP")
(log/info error-logger "EVENT_PROCESSOR" [event])
(processor gallifrey-host event error-logger audit-logger)
(log/mdc-clear!)))
(catch Exception e
(println (str "Unexpected exception during processing: " (.getMessage e)))))))))))))
(defn- from-kafka
[event-config gallifrey-host loggers]
(let [{:keys [topic consumer-group processor kafka-config]} (:aai event-config)
[error-logger audit-logger] loggers
kfc (ck/clj-kafka-consumer kafka-config consumer-group topic error-logger)
chan (ca/chan 5)
error-chan (ck/subscribe kfc chan 30000 "Polling-Kafka-Thread" error-logger)]
(log/info error-logger "EVENT_PROCESSOR"
[(format "AAI created. Starting polling a KAFKA Topic '%s' on '%s'" topic (kafka-config "bootstrap.servers"))])
(ca/go-loop []
(let [recs (ca/<! chan)]
(log/mdc-init! "SPIKE-EVENT" "CHAMELEON" "" "" gallifrey-host)
(if recs
(do (doseq [r recs]
(log/info error-logger "EVENT_PROCESSOR" [(str "Processing " (:value r))])
(processor gallifrey-host (:value r) error-logger audit-logger)
(log/info error-logger "EVENT_PROCESSOR" [(str "Processed Message " (:value r))])
(log/mdc-clear!))
(recur))
(ca/<! error-chan))))))
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