add grpc API adapter (cadence-workflow#673)

Author: mkolodezny

build.gradle

@@ -1,6 +1,7 @@
 buildscript {
  dependencies {
  classpath "gradle.plugin.org.jruyi.gradle:thrift-gradle-plugin:0.4.1"
+ classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.11'
  }
 }
 
@@ -11,6 +12,7 @@ plugins {
  id 'net.ltgt.errorprone' version '1.1.1'
  id 'java-library'
  id 'jacoco'
+ id 'com.google.protobuf' version '0.8.11'
 }
 
 repositories {
@@ -21,6 +23,8 @@ repositories {
  jcenter()
 }
 
+apply plugin: 'com.google.protobuf'
+apply plugin: 'idea' // IntelliJ plugin to see files generated from protos
 apply plugin: 'maven'
 apply plugin: 'org.jruyi.thrift'
 apply plugin: 'maven-publish'
@@ -63,6 +67,14 @@ dependencies {
  compile group: 'io.micrometer', name: 'micrometer-core', version: '1.1.2'
  compile group: 'javax.annotation', name: 'javax.annotation-api', version: '1.3.2'
  compile group: 'com.auth0', name: 'java-jwt', version:'3.10.2'
+ compile group: 'com.google.protobuf', name: 'protobuf-java', version: '3.8.0'
+ compile group: 'com.google.api.grpc', name: 'proto-google-common-protos', version: '1.17.0'
+ compile group: 'io.grpc', name: 'grpc-testing', version: '1.28.0'
+ compile group: 'com.google.protobuf', name: 'protobuf-java-util', version: '3.21.1'
+
+ implementation 'io.grpc:grpc-netty-shaded:1.28.0'
+ implementation 'io.grpc:grpc-protobuf:1.28.0'
+ implementation 'io.grpc:grpc-stub:1.28.0'
 
  testCompile group: 'junit', name: 'junit', version: '4.12'
  testCompile group: 'com.googlecode.junit-toolbox', name: 'junit-toolbox', version: '2.4'
@@ -72,7 +84,7 @@ dependencies {
 license {
  header rootProject.file('license-header.txt')
  skipExistingHeaders true
- excludes(["**/*.json", "com/uber/cadence/*.java", "com/uber/cadence/shadower/*.java"]) // config files and generated code
+ excludes(["**/*.json", "**/idls","com/uber/cadence/*.java", "com/uber/cadence/shadower/*.java"]) // config files and generated code
 }
 
 task initDlsSubmodule(type: Exec) {
@@ -92,6 +104,50 @@ compileThrift {
  sourceItems "${projectDir}/src/main/idls/thrift/cadence.thrift","${projectDir}/src/main/idls/thrift/shared.thrift","${projectDir}/src/main/idls/thrift/shadower.thrift"
 }
 
+sourceSets {
+ main {
+ proto {
+ srcDir 'src/main/idls/proto'
+ }
+ java {
+ srcDir 'src/main'
+ }
+ }
+}
+
+protobuf {
+ protoc {
+ artifact = 'com.google.protobuf:protoc:3.11.0'
+ }
+ plugins {
+ grpc {
+ artifact = 'io.grpc:protoc-gen-grpc-java:1.28.0'
+ }
+ }
+ generateProtoTasks {
+ all().each { task -> task.dependsOn updateDlsSubmodule }
+ all()*.plugins {
+ grpc {
+ outputSubDir = 'java'
+ }
+ }
+ }
+}
+
+protobuf {
+ generatedFilesBaseDir = "$buildDir/generated-sources/proto"
+}
+idea {
+ module {
+ sourceDirs += file("$buildDir/generated/main/java");
+ sourceDirs += file("$buildDir/generated/main/grpc");
+ }
+}
+
+clean {
+ delete protobuf.generatedFilesBaseDir
+}
+
 compileJava {
  dependsOn 'googleJavaFormat'
  options.encoding = 'UTF-8'
@@ -298,3 +354,4 @@ jacocoTestReport {
  }))
  }
 }
+