fix(mixins): enable codegen for standalone mixin APIs, add IAM integ test

.githooks/pre-commit

@@ -134,7 +134,7 @@ if [ $NUM_JAVA_FILES_CHANGED -gt 0 ]
 then
   echo_status "Checking Apache License Header ..."
   header_check_preparation
-  addlicense -c "Google LLC" -l apache -check $(find $PWD -type f -name '*.java')
+  addlicense -c "Google LLC" -l apache -check $(find $PWD -type f -name '*.java' ! -iname '*PlaceholderFile.java')
   CHECK_STATUS=$?
   if [ $CHECK_STATUS != 0 ]
   then

.github/workflows/ci.yaml

@@ -49,7 +49,7 @@ jobs:
         run: bazel --batch test $(bazel query "//src/test/..." | grep "Test$") --noshow_progress
 
       - name: Integration Tests
-        run: bazel --batch test //test/integration:asset //test/integration:credentials //test/integration:kms //test/integration:logging //test/integration:redis //test/integration:library --noshow_progress
+        run: bazel --batch test //test/integration:asset //test/integration:credentials //test/integration:iam //test/integration:kms //test/integration:logging //test/integration:redis //test/integration:library --noshow_progress
 
       - uses: actions/upload-artifact@v2
         if: ${{ failure() }}
@@ -90,5 +90,5 @@ jobs:
       - name: License Header Check
         run: |
           go get -u github.com/google/addlicense
-          addlicense -c "Google LLC" -l apache -check $(find $PWD -type f -name '*.java')
+          addlicense -c "Google LLC" -l apache -check $(find $PWD -type f -name '*.java' ! -iname '*PlaceholderFile.java')
 

src/main/java/com/google/api/generator/gapic/protoparser/Parser.java

@@ -215,13 +215,20 @@ public static List<Service> parseServices(
     // indicator that we are not generating a GAPIC client for the mixed-in service on its own.
     Function<Service, String> serviceFullNameFn =
         s -> String.format("%s.%s", s.protoPakkage(), s.name());
-    Set<Service> blockedCodegenMixinApis =
-        services.stream()
-            .filter(s -> MIXIN_ALLOWLIST.contains(serviceFullNameFn.apply(s)))
-            .map(s -> s)
-            .collect(Collectors.toSet());
+    Set<Service> blockedCodegenMixinApis = new HashSet<>();
+    Set<Service> definedServices = new HashSet<>();
+    for (Service s : services) {
+      if (MIXIN_ALLOWLIST.contains(serviceFullNameFn.apply(s))) {
+        blockedCodegenMixinApis.add(s);
+      } else {
+        definedServices.add(s);
+      }
+    }
     // It's very unlikely the blocklisted APIs will contain the other, or any other service.
-    boolean servicesContainBlocklistedApi = !blockedCodegenMixinApis.isEmpty();
+    boolean servicesContainBlocklistedApi =
+        !blockedCodegenMixinApis.isEmpty() && !definedServices.isEmpty();
+    // Service names that are stated in the YAML file (as mixins). Used to filter
+    // blockedCodegenMixinApis.
     Set<String> mixedInApis =
         !serviceYamlProtoOpt.isPresent()
             ? Collections.emptySet()

src/test/java/com/google/api/generator/gapic/composer/constants/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@rules_java//java:defs.bzl", "java_binary")
+
 package(default_visibility = ["//visibility:public"])
 
 filegroup(

src/test/java/com/google/api/generator/gapic/composer/defaultvalue/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@rules_java//java:defs.bzl", "java_test")
+load("@rules_java//java:defs.bzl", "java_proto_library", "java_test")
 
 package(default_visibility = ["//visibility:public"])
 

src/test/java/com/google/api/generator/gapic/composer/resourcename/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@rules_java//java:defs.bzl", "java_test")
+load("@rules_java//java:defs.bzl", "java_proto_library", "java_test")
 
 package(default_visibility = ["//visibility:public"])
 

test/integration/BUILD.bazel

@@ -5,13 +5,17 @@ load(
     "java_gapic_test",
     "java_grpc_library",
     "java_proto_library",
+    "proto_library_with_info",
 )
 load(
     "//:rules_bazel/java/integration_test.bzl",
     "golden_update",
     "integration_test",
 )
 
+# KMS (for mixins).
+load("@rules_proto//proto:defs.bzl", "proto_library")
+
 package(default_visibility = ["//visibility:public"])
 
 ####################################################
@@ -21,6 +25,7 @@ package(default_visibility = ["//visibility:public"])
 INTEGRATION_TEST_LIBRARIES = [
     "asset",  # Basic case.
     "credentials",  # Check that the capital name edge case is handled.
+    "iam",  # Mixin-only special-case API can build on its own.
     "kms",  # Mixins, with an override in the proto file.
     "logging",  # Java package remapping in gapic.yaml.
     "redis",  # Has a gapic.yaml.
@@ -31,6 +36,7 @@ INTEGRATION_TEST_LIBRARIES = [
 API_GAPIC_TARGETS = {
     "asset": "@com_google_googleapis//google/cloud/asset/v1:asset_java_gapic",
     "credentials": "@com_google_googleapis//google/iam/credentials/v1:credentials_java_gapic",
+    "iam": ":iam_java_gapic",  # Googleapis' LRO does not have a Java Gapic.
     "kms": ":kms_java_gapic",  # Local target because mixins are not rolled out yet.
     "logging": "@com_google_googleapis//google/logging/v2:logging_java_gapic",
     "redis": "@com_google_googleapis//google/cloud/redis/v1beta1:redis_java_gapic",
@@ -157,9 +163,35 @@ java_gapic_assembly_gradle_pkg(
     ],
 )
 
-# KMS (for mixins).
-load("@rules_proto//proto:defs.bzl", "proto_library")
-load("@com_google_googleapis_imports//:imports.bzl", "proto_library_with_info")
+# IAM (for a standalone mixed-in API).
+java_gapic_library(
+    name = "iam_java_gapic",
+    srcs = ["@com_google_googleapis//google/iam/v1:iam_proto_with_info"],
+    grpc_service_config = "iam_grpc_service_config.json",
+    test_deps = [
+        "@com_google_googleapis//google/iam/v1:iam_java_grpc",
+    ],
+    deps = [
+        "@com_google_googleapis//google/iam/v1:iam_java_proto",
+    ],
+)
+
+java_gapic_test(
+    name = "iam_java_gapic_test_suite",
+    test_classes = [
+        "com.google.iam.v1.IAMPolicyClientTest",
+    ],
+    runtime_deps = ["iam_java_gapic_test"],
+)
+
+java_gapic_assembly_gradle_pkg(
+    name = "google-cloud-iam-java",
+    deps = [
+        ":iam_java_gapic",
+        "@com_google_googleapis//google/iam/v1:iam_java_grpc",
+        "@com_google_googleapis//google/iam/v1:iam_java_proto",
+    ],
+)
 
 proto_library(
     name = "kms_proto",

test/integration/goldens/iam/BUILD.bazel

@@ -0,0 +1,9 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "goldens_files",
+    srcs = glob([
+        "*.java",
+        "gapic_metadata.json",
+    ]),
+)

test/integration/goldens/iam/GrpcIAMPolicyCallableFactory.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.iam.v1.stub;
+
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcCallableFactory;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.OperationsStub;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC callable factory implementation for the IAMPolicy service API.
+ *
+ * <p>This class is for advanced usage.
+ */
+@Generated("by gapic-generator-java")
+public class GrpcIAMPolicyCallableFactory implements GrpcStubCallableFactory {
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      UnaryCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createUnaryCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, PagedListResponseT>
+      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createPagedCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBatchingCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      BatchingCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createBatchingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, MetadataT>
+      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
+          GrpcCallSettings<RequestT, Operation> grpcCallSettings,
+          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
+          ClientContext clientContext,
+          OperationsStub operationsStub) {
+    return GrpcCallableFactory.createOperationCallable(
+        grpcCallSettings, callSettings, clientContext, operationsStub);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createBidiStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createServerStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createClientStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+}