tunnel: add gRPC over unix domain socket to the go backend

With gRPC it will be easier to extend the go backend API.
In this commit the Version function is reimplemented in gRPC.

1 files changed, 12 insertions, 0 deletions

diff --git a/build.gradle b/build.gradle
index 8615fb43..f7a864e5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,15 +12,27 @@ buildscript {
         datastoreVersion = '1.0.0'
         desugarVersion = '1.1.5'
         fragmentVersion = '1.4.1'
+        grpcVersion = '1.42.1'
+        gradleVersion = '4.0.1'
         jsr305Version = '3.0.2'
         junitVersion = '4.13.2'
         lifecycleRuntimeKtxVersion = '2.4.1'
         materialComponentsVersion = '1.6.0'
         preferenceVersion = '1.2.0'
+        protobufGradleVersion = '0.8.17'
+        protobufLiteVersion = '3.0.0'
+        protocVersion = '3.19.1'
         zxingEmbeddedVersion = '4.3.0'
 
         groupName = 'com.wireguard.android'
     }
+
+    dependencies {
+        classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufGradleVersion"
+        // gradle plugin 4.0.1 required for fixing bug:
+        // https://stackoverflow.com/questions/62168227/getting-source-and-destination-must-be-different-error-while-building-project/62223434#62223434
+        //classpath "com.android.tools.build:gradle:$gradleVersion"
+    }
 }
 
 plugins {