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json.clj
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json.clj
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(ns jackdaw.serdes.json
"Implements a JSON SerDes (Serializer/Deserializer)."
{:license "BSD 3-Clause License <https://github.com/FundingCircle/jackdaw/blob/master/LICENSE>"}
(:require [clojure.data.json :as json]
[jackdaw.serdes.fn :as jsfn])
(:import java.nio.charset.StandardCharsets
org.apache.kafka.common.serialization.Serdes))
(set! *warn-on-reflection* true)
(defn to-bytes
"Converts a string to a byte array."
[data]
(.getBytes ^String data StandardCharsets/UTF_8))
(defn from-bytes
"Converts a byte array to a string."
[^bytes data]
(String. data StandardCharsets/UTF_8))
(defn serializer
"Returns a JSON serializer."
[]
(jsfn/new-serializer {:serialize (fn [_ _ data]
(when data
(to-bytes (json/write-str data))))}))
(defn deserializer
"Returns a JSON deserializer."
[]
(jsfn/new-deserializer {:deserialize (fn [_ _ data]
(when data
(-> (from-bytes data)
(json/read-str :key-fn keyword))))}))
(defn serde
"Returns a JSON serde."
[]
(Serdes/serdeFrom (serializer) (deserializer)))