Merge 0ad2b2e into 236ab90

gojek · Jul 17, 2020 · 528c9f2 · 528c9f2
2 parents 236ab90 + 0ad2b2e
commit 528c9f2
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diff --git a/README.md b/README.md
@@ -278,6 +278,9 @@ This will allow an actor to join messages from 2 topics into 1 result. To be abl
 
 And your actor's handler function be like
 ```clojure
+(ns my-actor
+  (:require [ziggurat.middleware.stream-joins :as mw))
+
 (def handler-func
   (-> main-func
       (mw/protobuf->hash [com.gojek.esb.booking.BookingLogMessage com.gojek.esb.booking.BookingLogMessage] :booking)))
@@ -291,11 +294,11 @@ Your handler function will receive a message in the following format/structure
 {:topic-1-key "message-from-1st-topic" :topic-2-key "message-from-2nd-topic"}
 ```
 
-## Connecting to a RabbitMQ cluster (alpha feature) 
+## Connecting to a RabbitMQ cluster (alpha feature)
 * To connect to RabbitMQ clusters add the following config to your `config.edn`
 ```clojure
 {:ziggurat {:messaging {:constructor "ziggurat.messaging.rabbitmq-cluster-wrapper/->RabbitMQMessaging"
-            :rabbit-mq-connection {:hosts "g-lambda-lambda-rabbitmq-a-01,g-lambda-lambda-rabbitmq-a-02,g-lambda-lambda-rabbitmq-a-03" 
+            :rabbit-mq-connection {:hosts "g-lambda-lambda-rabbitmq-a-01,g-lambda-lambda-rabbitmq-a-02,g-lambda-lambda-rabbitmq-a-03"
                                    :port [5672 :int]
                                    :prefetch-count  [3 :int]
                                    :username        "guest"
@@ -304,7 +307,7 @@ Your handler function will receive a message in the following format/structure
                                    :admin-port      [15672 :int]
                                    :ha-sync-mode    "automatic"
                                    :channel-timeout [2000 :int]}}}}
-``` 
+```
 * `:hosts` is a comma separated values of RabbitMQ hostnames (dns-names OR IPs).
 * `:port` specifies the port number on which the RabbitMQ nodes are running.
 * `:ha-mode` is set to `"all"`.

diff --git a/src/ziggurat/middleware/default.clj b/src/ziggurat/middleware/default.clj
@@ -5,7 +5,7 @@
             [ziggurat.metrics :as metrics]
             [ziggurat.sentry :refer [sentry-reporter]]))
 
-(defn- deserialize-message
+(defn deserialize-message
   "This function takes in the message(proto Byte Array) and the proto-class and deserializes the proto ByteArray into a
   Clojure PersistentHashMap.
   Temporary logic for migration of services to Ziggurat V3.0
@@ -32,28 +32,8 @@
           nil)))
     message))
 
-(defprotocol Deserializable
-  (deserialize [message proto-class topic-entity-name]))
-
-(defrecord RegularMessage [message])
-(defrecord StreamJoinsMessage [message])
-
-(extend-type RegularMessage
-  Deserializable
-  (deserialize [this proto-class topic-entity-name]
-    (deserialize-message (:message this) proto-class topic-entity-name)))
-
-(extend-type StreamJoinsMessage
-  Deserializable
-  (deserialize [this proto-class topic-entity-name]
-    (reduce
-     (fn [[k1 v1] [k2 v2]]
-       {k1 (deserialize-message v1 (if (vector? proto-class) (first proto-class) proto-class) topic-entity-name)
-        k2 (deserialize-message v2 (if (vector? proto-class) (second proto-class) proto-class) topic-entity-name)})
-     (:message this))))
-
 (defn protobuf->hash
   "This is a middleware function that takes in a message (Proto ByteArray or PersistentHashMap) and calls the handler-fn with the deserialized PersistentHashMap"
   [handler-fn proto-class topic-entity-name]
   (fn [message]
-    (handler-fn (deserialize message proto-class topic-entity-name))))
+    (handler-fn (deserialize-message message proto-class topic-entity-name))))
diff --git a/src/ziggurat/middleware/stream_joins.clj b/src/ziggurat/middleware/stream_joins.clj
@@ -0,0 +1,21 @@
+(ns ziggurat.middleware.stream-joins
+  (:require [ziggurat.middleware.default :as dmw]))
+
+(defn- deserialize-stream-joins-message
+  "This function takes in the message(proto Byte Array) and the proto-class and deserializes the proto ByteArray into a
+  Clojure PersistentHashMap.
+  Temporary logic for migration of services to Ziggurat V3.0
+    If the message is of type map, the function just returns the map as it is. In older versions of Ziggurat (< 3.0) we stored
+    the messages in deserialized formats in RabbitMQ and those messages can be processed by this function. So we have this logic here."
+  [message proto-class topic-entity-name]
+  (reduce
+   (fn [[k1 v1] [k2 v2]]
+     {k1 (dmw/deserialize-message v1 (if (vector? proto-class) (first proto-class) proto-class) topic-entity-name)
+      k2 (dmw/deserialize-message v2 (if (vector? proto-class) (second proto-class) proto-class) topic-entity-name)})
+   message))
+
+(defn protobuf->hash
+  "This is a middleware function that takes in a message (Proto ByteArray or PersistentHashMap) and calls the handler-fn with the deserialized PersistentHashMap"
+  [handler-fn proto-class topic-entity-name]
+  (fn [message]
+    (handler-fn (deserialize-stream-joins-message message proto-class topic-entity-name))))
diff --git a/src/ziggurat/streams.clj b/src/ziggurat/streams.clj
@@ -5,7 +5,6 @@
             [ziggurat.config :refer [ziggurat-config]]
             [ziggurat.header-transformer :as header-transformer]
             [ziggurat.mapper :refer [mapper-func ->MessagePayload]]
-            [ziggurat.middleware.default :as mw]
             [ziggurat.metrics :as metrics]
             [ziggurat.timestamp-transformer :as timestamp-transformer]
             [ziggurat.util.map :as umap]
@@ -23,8 +22,7 @@
            [io.opentracing.contrib.kafka.streams TracingKafkaClientSupplier]
            [io.opentracing.contrib.kafka TracingKafkaUtils]
            [io.opentracing.tag Tags]
-           [java.time Duration]
-           [ziggurat.middleware.default StreamJoinsMessage]))
+           [java.time Duration]))
 
 (def default-config-for-stream
   {:buffered-records-per-partition     10000
@@ -199,7 +197,7 @@
         join-type         (:join-type cfg-1)
         value-joiner      (reify ValueJoiner
                             (apply [_ left right]
-                              (mw/->StreamJoinsMessage {topic-key-1 left topic-key-2 right})))
+                              {topic-key-1 left topic-key-2 right}))
         out-strm          (if cfg-1
                             (case join-type
                               :left  (.leftJoin strm-1 strm-2 value-joiner join-window-ms)
@@ -221,12 +219,6 @@
          (map-values #(traced-handler-fn handler-fn channels % topic-entity)))
     (.build builder)))
 
-(defn- normalize-message-value [message]
-  (let [msg-val (:value message)]
-    (if (string? msg-val)
-      message ;; TODO: this should be JsonMessage
-      (assoc-in message [:value] (mw/->RegularMessage msg-val)))))
-
 (defn- topology [handler-fn {:keys [origin-topic oldest-processed-message-in-s]} topic-entity channels]
   (let [builder           (StreamsBuilder.)
         topic-entity-name (name topic-entity)
@@ -236,7 +228,6 @@
          (timestamp-transform-values topic-entity-name oldest-processed-message-in-s)
          (header-transform-values)
          (map-values #(log-and-report-metrics topic-entity-name %))
-         (map-values normalize-message-value)
          (map-values #(traced-handler-fn handler-fn channels % topic-entity)))
     (.build builder)))
 

diff --git a/test/ziggurat/middleware/default_test.clj b/test/ziggurat/middleware/default_test.clj
@@ -4,8 +4,7 @@
             [ziggurat.fixtures :as fix]
             [ziggurat.metrics :as metrics]
             [ziggurat.middleware.default :as mw])
-  (:import [flatland.protobuf.test Example$Photo]
-           [ziggurat.middleware.default RegularMessage StreamJoinsMessage]))
+  (:import [flatland.protobuf.test Example$Photo]))
 
 (use-fixtures :once (join-fixtures [fix/mount-only-config
                                     fix/silence-logging]))
@@ -21,39 +20,7 @@
           handler-fn         (fn [msg]
                                (if (= msg message)
                                  (reset! handler-fn-called? true)))]
-      ((mw/protobuf->hash handler-fn proto-class topic-entity-name) (mw/->RegularMessage proto-message))
-      (is (true? @handler-fn-called?))))
-  (testing "deserialize a message from a stream join"
-    (let [handler-fn-called?  (atom false)
-          left-message        {:id   123
-                               :path "/path/to/left"}
-          right-message       {:id   456
-                               :path "/path/to/right"}
-          proto-class         Example$Photo
-          topic-entity-name   "test"
-          left-proto-message  (proto/->bytes (proto/create Example$Photo left-message))
-          right-proto-message (proto/->bytes (proto/create Example$Photo right-message))
-          handler-fn          (fn [{:keys [left right]}]
-                                (if (and (= left left-message)
-                                         (= right right-message))
-                                  (reset! handler-fn-called? true)))]
-      ((mw/protobuf->hash handler-fn proto-class topic-entity-name) (mw/->StreamJoinsMessage {:left left-proto-message :right right-proto-message}))
-      (is (true? @handler-fn-called?))))
-  (testing "deserialize a message from a stream join using 2 proto classes"
-    (let [handler-fn-called?  (atom false)
-          left-message        {:id   123
-                               :path "/path/to/left"}
-          right-message       {:id   456
-                               :path "/path/to/right"}
-          proto-class         Example$Photo
-          topic-entity-name   "test"
-          left-proto-message  (proto/->bytes (proto/create Example$Photo left-message))
-          right-proto-message (proto/->bytes (proto/create Example$Photo right-message))
-          handler-fn          (fn [{:keys [left right]}]
-                                (if (and (= left left-message)
-                                         (= right right-message))
-                                  (reset! handler-fn-called? true)))]
-      ((mw/protobuf->hash handler-fn [proto-class proto-class] topic-entity-name) (mw/->StreamJoinsMessage {:left left-proto-message :right right-proto-message}))
+      ((mw/protobuf->hash handler-fn proto-class topic-entity-name) proto-message)
       (is (true? @handler-fn-called?))))
   (testing "When an already deserialised message is passed to the function it calls the handler fn without altering it"
     (let [handler-fn-called? (atom false)
@@ -64,7 +31,7 @@
           handler-fn         (fn [msg]
                                (if (= msg message)
                                  (reset! handler-fn-called? true)))]
-      ((mw/protobuf->hash handler-fn proto-class topic-entity-name) (mw/->RegularMessage message))
+      ((mw/protobuf->hash handler-fn proto-class topic-entity-name) message)
       (is (true? @handler-fn-called?))))
   (testing "When deserialisation fails, it reports to sentry, publishes metrics and passes nil to handler function"
     (let [handler-fn-called?      (atom false)
@@ -75,7 +42,7 @@
                                       (reset! handler-fn-called? true)))]
       (with-redefs [metrics/multi-ns-increment-count (fn [_ _ _]
                                                        (reset! metric-reporter-called? true))]
-        ((mw/protobuf->hash handler-fn nil topic-entity-name) (mw/->RegularMessage nil)))
+        ((mw/protobuf->hash handler-fn nil topic-entity-name) nil))
       (is (true? @handler-fn-called?))
       (is (true? @metric-reporter-called?))))
   (testing "using the new deserializer function"
@@ -86,6 +53,5 @@
           proto-class                 Example$Photo
           proto-message               (proto/->bytes (proto/create Example$Photo message))]
       (with-redefs [mw/deserialize-message (fn [_ _ _] (reset! deserialize-message-called? true))]
-        ((mw/protobuf->hash (constantly nil) proto-class topic-entity-name) (mw/->RegularMessage proto-message))
+        ((mw/protobuf->hash (constantly nil) proto-class topic-entity-name) proto-message)
         (is (true? @deserialize-message-called?))))))
-
diff --git a/test/ziggurat/middleware/stream_joins_test.clj b/test/ziggurat/middleware/stream_joins_test.clj
@@ -0,0 +1,43 @@
+(ns ziggurat.middleware.stream-joins-test
+  (:require [clojure.test :refer [deftest is join-fixtures testing use-fixtures]]
+            [protobuf.core :as proto]
+            [ziggurat.fixtures :as fix]
+            [ziggurat.middleware.stream-joins :as sjmw])
+  (:import [flatland.protobuf.test Example$Photo]))
+
+(use-fixtures :once (join-fixtures [fix/mount-only-config
+                                    fix/silence-logging]))
+
+(deftest common-protobuf->hash-test
+  (testing "deserialize a message from a stream join"
+    (let [handler-fn-called?  (atom false)
+          left-message        {:id   123
+                               :path "/path/to/left"}
+          right-message       {:id   456
+                               :path "/path/to/right"}
+          proto-class         Example$Photo
+          topic-entity-name   "test"
+          left-proto-message  (proto/->bytes (proto/create Example$Photo left-message))
+          right-proto-message (proto/->bytes (proto/create Example$Photo right-message))
+          handler-fn          (fn [{:keys [left right]}]
+                                (if (and (= left left-message)
+                                         (= right right-message))
+                                  (reset! handler-fn-called? true)))]
+      ((sjmw/protobuf->hash handler-fn proto-class topic-entity-name) {:left left-proto-message :right right-proto-message})
+      (is (true? @handler-fn-called?))))
+  (testing "deserialize a message from a stream join using 2 proto classes"
+    (let [handler-fn-called?  (atom false)
+          left-message        {:id   123
+                               :path "/path/to/left"}
+          right-message       {:id   456
+                               :path "/path/to/right"}
+          proto-class         Example$Photo
+          topic-entity-name   "test"
+          left-proto-message  (proto/->bytes (proto/create Example$Photo left-message))
+          right-proto-message (proto/->bytes (proto/create Example$Photo right-message))
+          handler-fn          (fn [{:keys [left right]}]
+                                (if (and (= left left-message)
+                                         (= right right-message))
+                                  (reset! handler-fn-called? true)))]
+      ((sjmw/protobuf->hash handler-fn [proto-class proto-class] topic-entity-name) {:left left-proto-message :right right-proto-message})
+      (is (true? @handler-fn-called?)))))
diff --git a/test/ziggurat/streams_test.clj b/test/ziggurat/streams_test.clj
@@ -5,6 +5,7 @@
             [ziggurat.fixtures :as fix]
             [ziggurat.config :refer [ziggurat-config]]
             [ziggurat.middleware.default :as default-middleware]
+            [ziggurat.middleware.stream-joins :as stream-joins-middleware]
             [ziggurat.middleware.json :as json-middleware]
             [ziggurat.tracer :refer [tracer]]
             [ziggurat.messaging.producer :as producer])
@@ -103,10 +104,10 @@
 (deftest start-stream-joins-test
   (testing "stream joins using inner join"
     (let [message-received-count (atom 0)
-          mapped-fn              (get-mapped-fn message-received-count {:topic {:id 7, :path "/photos/h2k3j4h9h23"}, :another-test-topic {:id 7, :path "/photos/h2k3j4h9h23"}})
+          mapped-fn              (get-mapped-fn message-received-count {:topic message :another-test-topic message})
           times                  1
           kvs                    (repeat times message-key-value)
-          handler-fn             (default-middleware/protobuf->hash mapped-fn proto-class :default)
+          handler-fn             (stream-joins-middleware/protobuf->hash mapped-fn proto-class :default)
           streams                (start-streams {:default {:handler-fn handler-fn}}
                                                 (-> (ziggurat-config)
                                                     (assoc-in [:stream-router :default :consumer-type] :stream-joins)
@@ -128,10 +129,10 @@
       (is (= times @message-received-count))))
   (testing "stream joins using left join"
     (let [message-received-count (atom 0)
-          mapped-fn              (get-mapped-fn message-received-count {:topic {:id 7, :path "/photos/h2k3j4h9h23"}, :another-test-topic {:id 7, :path "/photos/h2k3j4h9h23"}})
+          mapped-fn              (get-mapped-fn message-received-count {:topic message :another-test-topic message})
           times                  1
           kvs                    (repeat times message-key-value)
-          handler-fn             (default-middleware/protobuf->hash mapped-fn proto-class :default)
+          handler-fn             (stream-joins-middleware/protobuf->hash mapped-fn proto-class :default)
           streams                (start-streams {:default {:handler-fn handler-fn}}
                                                 (-> (ziggurat-config)
                                                     (assoc-in [:stream-router :default :consumer-type] :stream-joins)
@@ -153,10 +154,10 @@
       (is (= times @message-received-count))))
   (testing "stream joins using outer join"
     (let [message-received-count (atom 0)
-          mapped-fn              (get-mapped-fn message-received-count {:topic {:id 7, :path "/photos/h2k3j4h9h23"}, :another-test-topic {:id 7, :path "/photos/h2k3j4h9h23"}})
+          mapped-fn              (get-mapped-fn message-received-count {:topic message :another-test-topic message})
           times                  1
           kvs                    (repeat times message-key-value)
-          handler-fn             (default-middleware/protobuf->hash mapped-fn proto-class :default)
+          handler-fn             (stream-joins-middleware/protobuf->hash mapped-fn proto-class :default)
           streams                (start-streams {:default {:handler-fn handler-fn}}
                                                 (-> (ziggurat-config)
                                                     (assoc-in [:stream-router :default :consumer-type] :stream-joins)