feat: Enable REST transport for most of Java and Go clients (#311)

* chore(deps): upgrade gapic-generator-java to 2.8.0 and update gax-java to 2.18.1

PiperOrigin-RevId: 450543911

Source-Link: googleapis/googleapis@5528344

Source-Link: https://github.com/googleapis/googleapis-gen/commit/9f6775cab1958982b88967a43e5e806af0f135db
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* chore: Integrate new gapic-generator-java and rules_gapic

PiperOrigin-RevId: 454027580

Source-Link: googleapis/googleapis@1b22277

Source-Link: https://github.com/googleapis/googleapis-gen/commit/e04cea20d0d12eb5c3bdb360a9e72b654edcb638
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: Enable REST transport for most of Java and Go clients

PiperOrigin-RevId: 456641589

Source-Link: googleapis/googleapis@8a251f5

Source-Link: https://github.com/googleapis/googleapis-gen/commit/4ca52a529cf01308d9714950edffbea3560cfbdb
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Update pom.xml

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Neenu Shaji <[email protected]>

Author: gcf-owl-bot[bot]

google-cloud-workflow-executions/pom.xml

@@ -62,6 +62,10 @@
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-httpjson</artifactId>
+    </dependency>
 
     <!-- Test dependencies -->
     <dependency>
@@ -82,12 +86,24 @@
       <scope>test</scope>
     </dependency>
     <!-- Need testing utility classes for generated gRPC clients tests -->
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax</artifactId>
+      <classifier>testlib</classifier>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
       <classifier>testlib</classifier>
       <scope>test</scope>
     </dependency>
+    <dependency>
+    <groupId>com.google.api</groupId>
+      <artifactId>gax-httpjson</artifactId>
+      <classifier>testlib</classifier>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <profiles>

google-cloud-workflow-executions/src/main/java/com/google/cloud/workflows/executions/v1/ExecutionsClient.java

@@ -18,7 +18,6 @@
 
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
-import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.paging.AbstractFixedSizeCollection;
 import com.google.api.gax.paging.AbstractPage;
@@ -99,6 +98,20 @@
  * ExecutionsClient executionsClient = ExecutionsClient.create(executionsSettings);
  * }</pre>
  *
+ * <p>To use REST (HTTP1.1/JSON) transport (instead of gRPC) for sending and receiving requests over
+ * the wire:
+ *
+ * <pre>{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
+ * ExecutionsSettings executionsSettings =
+ *     ExecutionsSettings.newBuilder()
+ *         .setTransportChannelProvider(
+ *             ExecutionsSettings.defaultHttpJsonTransportProviderBuilder().build())
+ *         .build();
+ * ExecutionsClient executionsClient = ExecutionsClient.create(executionsSettings);
+ * }</pre>
+ *
  * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
  */
 @Generated("by gapic-generator-java")
@@ -123,7 +136,6 @@ public static final ExecutionsClient create(ExecutionsSettings settings) throws
    * Constructs an instance of ExecutionsClient, using the given stub for making calls. This is for
    * advanced usage - prefer using create(ExecutionsSettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final ExecutionsClient create(ExecutionsStub stub) {
     return new ExecutionsClient(stub);
   }
@@ -137,7 +149,6 @@ protected ExecutionsClient(ExecutionsSettings settings) throws IOException {
     this.stub = ((ExecutionsStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected ExecutionsClient(ExecutionsStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -147,7 +158,6 @@ public final ExecutionsSettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public ExecutionsStub getStub() {
     return stub;
   }
@@ -297,7 +307,7 @@ public final ListExecutionsPagedResponse listExecutions(ListExecutionsRequest re
    *           .build();
    *   while (true) {
    *     ListExecutionsResponse response = executionsClient.listExecutionsCallable().call(request);
-   *     for (Execution element : response.getResponsesList()) {
+   *     for (Execution element : response.getExecutionsList()) {
    *       // doThingsWith(element);
    *     }
    *     String nextPageToken = response.getNextPageToken();

google-cloud-workflow-executions/src/main/java/com/google/cloud/workflows/executions/v1/ExecutionsSettings.java

@@ -23,6 +23,7 @@
 import com.google.api.gax.core.GoogleCredentialsProvider;
 import com.google.api.gax.core.InstantiatingExecutorProvider;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.httpjson.InstantiatingHttpJsonChannelProvider;
 import com.google.api.gax.rpc.ApiClientHeaderProvider;
 import com.google.api.gax.rpc.ClientContext;
 import com.google.api.gax.rpc.ClientSettings;
@@ -117,11 +118,18 @@ public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilde
     return ExecutionsStubSettings.defaultCredentialsProviderBuilder();
   }
 
-  /** Returns a builder for the default ChannelProvider for this service. */
+  /** Returns a builder for the default gRPC ChannelProvider for this service. */
   public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
     return ExecutionsStubSettings.defaultGrpcTransportProviderBuilder();
   }
 
+  /** Returns a builder for the default REST ChannelProvider for this service. */
+  @BetaApi
+  public static InstantiatingHttpJsonChannelProvider.Builder
+      defaultHttpJsonTransportProviderBuilder() {
+    return ExecutionsStubSettings.defaultHttpJsonTransportProviderBuilder();
+  }
+
   public static TransportChannelProvider defaultTransportChannelProvider() {
     return ExecutionsStubSettings.defaultTransportChannelProvider();
   }
@@ -131,11 +139,17 @@ public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuil
     return ExecutionsStubSettings.defaultApiClientHeaderProviderBuilder();
   }
 
-  /** Returns a new builder for this class. */
+  /** Returns a new gRPC builder for this class. */
   public static Builder newBuilder() {
     return Builder.createDefault();
   }
 
+  /** Returns a new REST builder for this class. */
+  @BetaApi
+  public static Builder newHttpJsonBuilder() {
+    return Builder.createHttpJsonDefault();
+  }
+
   /** Returns a new builder for this class. */
   public static Builder newBuilder(ClientContext clientContext) {
     return new Builder(clientContext);
@@ -173,6 +187,11 @@ private static Builder createDefault() {
       return new Builder(ExecutionsStubSettings.newBuilder());
     }
 
+    @BetaApi
+    private static Builder createHttpJsonDefault() {
+      return new Builder(ExecutionsStubSettings.newHttpJsonBuilder());
+    }
+
     public ExecutionsStubSettings.Builder getStubSettingsBuilder() {
       return ((ExecutionsStubSettings.Builder) getStubSettings());
     }

google-cloud-workflow-executions/src/main/java/com/google/cloud/workflows/executions/v1/stub/ExecutionsStubSettings.java

@@ -27,6 +27,9 @@
 import com.google.api.gax.grpc.GaxGrpcProperties;
 import com.google.api.gax.grpc.GrpcTransportChannel;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.httpjson.GaxHttpJsonProperties;
+import com.google.api.gax.httpjson.HttpJsonTransportChannel;
+import com.google.api.gax.httpjson.InstantiatingHttpJsonChannelProvider;
 import com.google.api.gax.retrying.RetrySettings;
 import com.google.api.gax.rpc.ApiCallContext;
 import com.google.api.gax.rpc.ApiClientHeaderProvider;
@@ -177,13 +180,17 @@ public UnaryCallSettings<CancelExecutionRequest, Execution> cancelExecutionSetti
     return cancelExecutionSettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public ExecutionsStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()
         .equals(GrpcTransportChannel.getGrpcTransportName())) {
       return GrpcExecutionsStub.create(this);
     }
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(HttpJsonTransportChannel.getHttpJsonTransportName())) {
+      return HttpJsonExecutionsStub.create(this);
+    }
     throw new UnsupportedOperationException(
         String.format(
             "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
@@ -216,30 +223,56 @@ public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilde
         .setUseJwtAccessWithScope(true);
   }
 
-  /** Returns a builder for the default ChannelProvider for this service. */
+  /** Returns a builder for the default gRPC ChannelProvider for this service. */
   public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
     return InstantiatingGrpcChannelProvider.newBuilder()
         .setMaxInboundMessageSize(Integer.MAX_VALUE);
   }
 
+  /** Returns a builder for the default REST ChannelProvider for this service. */
+  @BetaApi
+  public static InstantiatingHttpJsonChannelProvider.Builder
+      defaultHttpJsonTransportProviderBuilder() {
+    return InstantiatingHttpJsonChannelProvider.newBuilder();
+  }
+
   public static TransportChannelProvider defaultTransportChannelProvider() {
     return defaultGrpcTransportProviderBuilder().build();
   }
 
   @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
-  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+  public static ApiClientHeaderProvider.Builder defaultGrpcApiClientHeaderProviderBuilder() {
     return ApiClientHeaderProvider.newBuilder()
         .setGeneratedLibToken(
             "gapic", GaxProperties.getLibraryVersion(ExecutionsStubSettings.class))
         .setTransportToken(
             GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
   }
 
-  /** Returns a new builder for this class. */
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultHttpJsonApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken(
+            "gapic", GaxProperties.getLibraryVersion(ExecutionsStubSettings.class))
+        .setTransportToken(
+            GaxHttpJsonProperties.getHttpJsonTokenName(),
+            GaxHttpJsonProperties.getHttpJsonVersion());
+  }
+
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ExecutionsStubSettings.defaultGrpcApiClientHeaderProviderBuilder();
+  }
+
+  /** Returns a new gRPC builder for this class. */
   public static Builder newBuilder() {
     return Builder.createDefault();
   }
 
+  /** Returns a new REST builder for this class. */
+  public static Builder newHttpJsonBuilder() {
+    return Builder.createHttpJsonDefault();
+  }
+
   /** Returns a new builder for this class. */
   public static Builder newBuilder(ClientContext clientContext) {
     return new Builder(clientContext);
@@ -340,6 +373,19 @@ private static Builder createDefault() {
       return initDefaults(builder);
     }
 
+    private static Builder createHttpJsonDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+
+      builder.setTransportChannelProvider(defaultHttpJsonTransportProviderBuilder().build());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultHttpJsonApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      builder.setMtlsEndpoint(getDefaultMtlsEndpoint());
+      builder.setSwitchToMtlsEndpointAllowed(true);
+
+      return initDefaults(builder);
+    }
+
     private static Builder initDefaults(Builder builder) {
       builder
           .listExecutionsSettings()

google-cloud-workflow-executions/src/main/java/com/google/cloud/workflows/executions/v1/stub/HttpJsonExecutionsCallableFactory.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2022 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.cloud.workflows.executions.v1.stub;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.httpjson.HttpJsonCallSettings;
+import com.google.api.gax.httpjson.HttpJsonCallableFactory;
+import com.google.api.gax.httpjson.HttpJsonOperationSnapshotCallable;
+import com.google.api.gax.httpjson.HttpJsonStubCallableFactory;
+import com.google.api.gax.httpjson.longrunning.stub.OperationsStub;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.ClientContext;
+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.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * REST callable factory implementation for the Executions service API.
+ *
+ * <p>This class is for advanced usage.
+ */
+@Generated("by gapic-generator-java")
+@BetaApi
+public class HttpJsonExecutionsCallableFactory
+    implements HttpJsonStubCallableFactory<Operation, OperationsStub> {
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      HttpJsonCallSettings<RequestT, ResponseT> httpJsonCallSettings,
+      UnaryCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return HttpJsonCallableFactory.createUnaryCallable(
+        httpJsonCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, PagedListResponseT>
+      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(
+          HttpJsonCallSettings<RequestT, ResponseT> httpJsonCallSettings,
+          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,
+          ClientContext clientContext) {
+    return HttpJsonCallableFactory.createPagedCallable(
+        httpJsonCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBatchingCallable(
+      HttpJsonCallSettings<RequestT, ResponseT> httpJsonCallSettings,
+      BatchingCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return HttpJsonCallableFactory.createBatchingCallable(
+        httpJsonCallSettings, callSettings, clientContext);
+  }
+
+  @BetaApi(
+      "The surface for long-running operations is not stable yet and may change in the future.")
+  @Override
+  public <RequestT, ResponseT, MetadataT>
+      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
+          HttpJsonCallSettings<RequestT, Operation> httpJsonCallSettings,
+          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
+          ClientContext clientContext,
+          OperationsStub operationsStub) {
+    UnaryCallable<RequestT, Operation> innerCallable =
+        HttpJsonCallableFactory.createBaseUnaryCallable(
+            httpJsonCallSettings, callSettings.getInitialCallSettings(), clientContext);
+    HttpJsonOperationSnapshotCallable<RequestT, Operation> initialCallable =
+        new HttpJsonOperationSnapshotCallable<RequestT, Operation>(
+            innerCallable,
+            httpJsonCallSettings.getMethodDescriptor().getOperationSnapshotFactory());
+    return HttpJsonCallableFactory.createOperationCallable(
+        callSettings, clientContext, operationsStub.longRunningClient(), initialCallable);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          HttpJsonCallSettings<RequestT, ResponseT> httpJsonCallSettings,
+          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return HttpJsonCallableFactory.createServerStreamingCallable(
+        httpJsonCallSettings, callSettings, clientContext);
+  }
+}