add protobuf example (#8)

* update gitignore

* add a protobuf example of a custom deserializer

.gitignore

@@ -1,10 +1,6 @@
 ### VisualStudioCode template
 .vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-*.code-workspace
+
 
 # Local History for Visual Studio Code
 .history/
@@ -97,6 +93,7 @@ target/
 lib_managed/
 src_managed/
 project/boot/
+project/project
 project/plugins/project/
 .history
 .cache

build.sbt

@@ -2,12 +2,23 @@ name                                     := "my_custom_deserializers"
 version                                  := sys.env.getOrElse("CREATED_TAG", "0.1")
 scalaVersion                             := "2.13.7"
 libraryDependencies += "org.apache.kafka" % "kafka-clients" % "2.8.1"
+libraryDependencies ++= Seq(
+  "com.thesamet.scalapb" %% "scalapb-runtime" % scalapb.compiler.Version.scalapbVersion % "protobuf",
+  "com.thesamet.scalapb.common-protos" %% "proto-google-common-protos-scalapb_0.11" % "2.5.0-2" % "protobuf",
+  "com.thesamet.scalapb.common-protos" %% "proto-google-common-protos-scalapb_0.11" % "2.5.0-2"
+)
+
+assembly / assemblyJarName := "plugins.jar"
 
 // ## Github Packages publish configs
 // More info, see: https://gist.github.com/guizmaii/2ca47b74ad8e26c772d7df6ada8ddb00
 val GITHUB_OWNER   = "conduktor"
 val GITHUB_PROJECT = "my_custom_deserializers"
 
+Compile / PB.targets := Seq(
+  scalapb.gen() -> (Compile / sourceManaged).value / "scalapb"
+)
+
 ThisBuild / publishTo         := Some(
   s"GitHub $GITHUB_OWNER Apache Maven Packages" at s"https://maven.pkg.github.com/$GITHUB_OWNER/$GITHUB_PROJECT"
 )

project/plugins.sbt

@@ -1 +1,3 @@
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.20")
+
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "1.1.0")

project/scalapb.sbt

@@ -0,0 +1,3 @@
+addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.3")
+
+libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.1"

src/main/protobuf/addressbook.proto

@@ -0,0 +1,26 @@
+syntax = "proto2";
+
+package io.example.conduktor.custom.deserializers;
+
+message Person {
+  required string name = 1;
+  required int32 id = 2;
+  optional string email = 3;
+
+  enum PhoneType {
+    MOBILE = 0;
+    HOME = 1;
+    WORK = 2;
+  }
+
+  message PhoneNumber {
+    required string number = 1;
+    optional PhoneType type = 2 [default = HOME];
+  }
+
+  repeated PhoneNumber phones = 4;
+}
+
+message AddressBook {
+  repeated Person people = 1;
+}

src/main/scala/io/example/conduktor/custom/deserializers/MyCustomProtobufDeserializer.scala

@@ -0,0 +1,14 @@
+package io.example.conduktor.custom.deserializers
+
+import org.apache.kafka.common.serialization.{Deserializer, Serializer}
+import io.example.conduktor.custom.deserializers.addressbook._
+
+final class MyCustomProtobufSerializer extends Serializer[Person] {
+  override def serialize(topic: String, data: Person): Array[Byte] = data.toByteArray
+}
+
+final class MyCustomProtobufDeserializer extends Deserializer[Person] {
+  override def deserialize(topic: String, data: Array[Byte]): Person = {
+      Person.parseFrom(data)
+  }
+}