istio-interop-testing: create a separate project and add istio echo s…

…erver code (#9321)

* istio-interop-testing: create a separate project and add istio echo server code
after removing from the grpc-interop-testing project

* add jib support

* use imported echo.proto from istio repo

* use context to propagate values from interceptor so the service's echo method has all values required to compose EchoResponse

build.gradle

@@ -4,6 +4,7 @@ plugins {
     id "com.google.osdetector" apply false
     id "me.champeau.gradle.japicmp" apply false
     id "net.ltgt.errorprone" apply false
+    id 'com.google.cloud.tools.jib' apply false
 }
 
 import net.ltgt.gradle.errorprone.CheckSeverity

istio-interop-testing/build.gradle

@@ -0,0 +1,68 @@
+plugins {
+    id "application"
+    id "java"
+
+    id "com.google.protobuf"
+    id 'com.google.cloud.tools.jib'
+}
+
+description = "gRPC: Istio Interop testing"
+
+configurations {
+    alpnagent
+}
+
+evaluationDependsOn(project(':grpc-context').path)
+
+dependencies {
+    implementation  project(':grpc-core'),
+            project(':grpc-netty'),
+            project(':grpc-protobuf'),
+            project(':grpc-services'),
+            project(':grpc-stub'),
+            project(':grpc-testing')
+
+    compileOnly libraries.javax.annotation
+
+    runtimeOnly libraries.netty.tcnative,
+            libraries.netty.tcnative.classes
+    testImplementation project(':grpc-context').sourceSets.test.output,
+            project(':grpc-api').sourceSets.test.output,
+            project(':grpc-core').sourceSets.test.output,
+            libraries.mockito.core,
+            libraries.junit,
+            libraries.truth
+    alpnagent libraries.jetty.alpn.agent
+}
+
+sourceSets {
+    main {
+        proto {
+            srcDir 'third_party/istio/src/main/proto'
+        }
+    }
+}
+
+configureProtoCompilation()
+
+import net.ltgt.gradle.errorprone.CheckSeverity
+
+compileJava {
+    // This isn't a library; it can use beta APIs
+    options.errorprone.check("BetaApi", CheckSeverity.OFF)
+}
+
+
+// For releasing to Docker Hub
+jib {
+    from.image = "gcr.io/distroless/java:8"
+    container {
+        ports = ['50051']
+        mainClass="io.grpc.testing.istio.EchoTestServer"
+    }
+    outputPaths {
+        tar = 'build/istio-echo-server.tar'
+        digest = 'build/istio-echo-server.digest'
+        imageId = 'build/istio-echo-server.id'
+    }
+}