[build] Add protobuf compiler plugin and required dependencies for generating gRPC Java stubs

build.gradle

@@ -17,6 +17,8 @@ plugins {
   id 'com.form.diff-coverage' version '0.9.5' apply false
   id 'me.champeau.jmh' version '0.6.7' apply false
   id 'io.github.lhotari.gradle-nar-plugin' version '0.5.1' apply false
+
+  id 'com.google.protobuf' version '0.9.1'
 }
 
 apply from: "$rootDir/gradle/helper/git.gradle"
@@ -45,6 +47,9 @@ def log4j2Version = '2.17.1'
 def pegasusVersion = '29.31.0'
 def jacksonVersion = '2.13.3'
 
+def grpcVersion = '1.54.1'
+def protobufVersion = '3.21.7'
+
 ext.libraries = [
     avro: 'org.apache.avro:avro:' + avroVersion,
     avroCompiler: 'org.apache.avro:avro-compiler:' + avroVersion,
@@ -114,7 +119,13 @@ ext.libraries = [
     xerces: 'xerces:xercesImpl:2.9.1',
     zkclient: 'com.101tec:zkclient:0.7', // For Kafka AdminUtils
     zookeeper: 'org.apache.zookeeper:zookeeper:3.5.9',
-    zstd: 'com.github.luben:zstd-jni:1.5.2-3'
+    zstd: 'com.github.luben:zstd-jni:1.5.2-3',
+
+    grpcNettyShaded: 'io.grpc:grpc-netty-shaded:' + grpcVersion,
+    grpcProtobuf: 'io.grpc:grpc-protobuf:' + grpcVersion,
+    grpcStub: 'io.grpc:grpc-stub:' + grpcVersion,
+    tomcatAnnotations: 'org.apache.tomcat:annotations-api:6.0.53',
+    guava: 'com.google.guava:guava:30.1-jre'
 ]
 
 group = 'com.linkedin.venice'
@@ -201,7 +212,6 @@ subprojects {
     }
     compileOnly {
       // These dependencies are transitively used at runtime, so we cannot exclude them further than compileOnly
-      exclude group: 'com.google.guava'
       exclude group: 'com.typesafe.scala-logging'
       exclude group: 'log4j'
       exclude group: 'org.slf4j'

services/venice-server/build.gradle

@@ -1,6 +1,7 @@
 plugins {
   id 'application'
   id 'com.github.johnrengelman.shadow'
+  id 'com.google.protobuf'
 }
 
 application {
@@ -48,6 +49,12 @@ dependencies {
   // It's necessary to pull in the most recent version of zkclient explicitly, otherwise Helix won't have it...
   implementation libraries.zkclient
 
+  implementation libraries.grpcNettyShaded
+  implementation libraries.grpcProtobuf
+  implementation libraries.grpcStub
+  compileOnly libraries.tomcatAnnotations
+  implementation libraries.guava
+
   testImplementation libraries.fastUtil
   testImplementation project(':internal:alpini:router:alpini-router-api')
   testImplementation project(':services:venice-router')
@@ -63,6 +70,25 @@ jar {
   }
 }
 
+def grpcVersion = '1.54.1'
+def protobufVersion = '3.21.7'
+
+protobuf {
+  protoc {
+    artifact = 'com.google.protobuf:protoc:' + protobufVersion
+  }
+  plugins {
+    grpc {
+      artifact = 'io.grpc:protoc-gen-grpc-java:' + grpcVersion
+    }
+  }
+  generateProtoTasks {
+    all()*.plugins {
+      grpc {}
+    }
+  }
+}
+
 ext {
   jacocoCoverageThreshold = 0.23
 }

services/venice-server/src/main/proto/VeniceReadService.proto

@@ -0,0 +1,13 @@
+syntax = 'proto3';
+
+service VeniceServer {
+  rpc ServeRequest (ClientRequest) returns (ServerReply) {}
+}
+
+message ClientRequest {
+  string message = 1;
+}
+
+message ServerReply {
+  string message = 1;
+}