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

README.md

@@ -27,13 +27,13 @@ If you are using Maven, add this to your pom.xml file:
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-retail:2.2.3'
+implementation 'com.google.cloud:google-cloud-retail:2.2.4'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-retail" % "2.2.3"
+libraryDependencies += "com.google.cloud" % "google-cloud-retail" % "2.2.4"
 ```
 
 ## Authentication

google-cloud-retail/pom.xml

@@ -65,6 +65,10 @@
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
+    </dependency>
+     <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-httpjson</artifactId>
     </dependency>
     <dependency>
       <groupId>org.threeten</groupId>
@@ -95,12 +99,24 @@
       <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-retail/src/main/java/com/google/cloud/retail/v2/CatalogServiceClient.java

@@ -99,6 +99,20 @@
  * CatalogServiceClient catalogServiceClient = CatalogServiceClient.create(catalogServiceSettings);
  * }</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.
+ * CatalogServiceSettings catalogServiceSettings =
+ *     CatalogServiceSettings.newBuilder()
+ *         .setTransportChannelProvider(
+ *             CatalogServiceSettings.defaultHttpJsonTransportProviderBuilder().build())
+ *         .build();
+ * CatalogServiceClient catalogServiceClient = CatalogServiceClient.create(catalogServiceSettings);
+ * }</pre>
+ *
  * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
  */
 @Generated("by gapic-generator-java")

google-cloud-retail/src/main/java/com/google/cloud/retail/v2/CatalogServiceSettings.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;
@@ -119,11 +120,18 @@ public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilde
     return CatalogServiceStubSettings.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 CatalogServiceStubSettings.defaultGrpcTransportProviderBuilder();
   }
 
+  /** Returns a builder for the default REST ChannelProvider for this service. */
+  @BetaApi
+  public static InstantiatingHttpJsonChannelProvider.Builder
+      defaultHttpJsonTransportProviderBuilder() {
+    return CatalogServiceStubSettings.defaultHttpJsonTransportProviderBuilder();
+  }
+
   public static TransportChannelProvider defaultTransportChannelProvider() {
     return CatalogServiceStubSettings.defaultTransportChannelProvider();
   }
@@ -133,11 +141,17 @@ public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuil
     return CatalogServiceStubSettings.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);
@@ -175,6 +189,11 @@ private static Builder createDefault() {
       return new Builder(CatalogServiceStubSettings.newBuilder());
     }
 
+    @BetaApi
+    private static Builder createHttpJsonDefault() {
+      return new Builder(CatalogServiceStubSettings.newHttpJsonBuilder());
+    }
+
     public CatalogServiceStubSettings.Builder getStubSettingsBuilder() {
       return ((CatalogServiceStubSettings.Builder) getStubSettings());
     }

google-cloud-retail/src/main/java/com/google/cloud/retail/v2/CompletionServiceClient.java

@@ -17,13 +17,13 @@
 package com.google.cloud.retail.v2;
 
 import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.httpjson.longrunning.OperationsClient;
 import com.google.api.gax.longrunning.OperationFuture;
 import com.google.api.gax.rpc.OperationCallable;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.retail.v2.stub.CompletionServiceStub;
 import com.google.cloud.retail.v2.stub.CompletionServiceStubSettings;
 import com.google.longrunning.Operation;
-import com.google.longrunning.OperationsClient;
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
@@ -107,13 +107,29 @@
  *     CompletionServiceClient.create(completionServiceSettings);
  * }</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.
+ * CompletionServiceSettings completionServiceSettings =
+ *     CompletionServiceSettings.newBuilder()
+ *         .setTransportChannelProvider(
+ *             CompletionServiceSettings.defaultHttpJsonTransportProviderBuilder().build())
+ *         .build();
+ * CompletionServiceClient completionServiceClient =
+ *     CompletionServiceClient.create(completionServiceSettings);
+ * }</pre>
+ *
  * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
  */
 @Generated("by gapic-generator-java")
 public class CompletionServiceClient implements BackgroundResource {
   private final CompletionServiceSettings settings;
   private final CompletionServiceStub stub;
-  private final OperationsClient operationsClient;
+  private final OperationsClient httpJsonOperationsClient;
+  private final com.google.longrunning.OperationsClient operationsClient;
 
   /** Constructs an instance of CompletionServiceClient with default settings. */
   public static final CompletionServiceClient create() throws IOException {
@@ -145,13 +161,17 @@ public static final CompletionServiceClient create(CompletionServiceStub stub) {
   protected CompletionServiceClient(CompletionServiceSettings settings) throws IOException {
     this.settings = settings;
     this.stub = ((CompletionServiceStubSettings) settings.getStubSettings()).createStub();
-    this.operationsClient = OperationsClient.create(this.stub.getOperationsStub());
+    this.operationsClient =
+        com.google.longrunning.OperationsClient.create(this.stub.getOperationsStub());
+    this.httpJsonOperationsClient = OperationsClient.create(this.stub.getHttpJsonOperationsStub());
   }
 
   protected CompletionServiceClient(CompletionServiceStub stub) {
     this.settings = null;
     this.stub = stub;
-    this.operationsClient = OperationsClient.create(this.stub.getOperationsStub());
+    this.operationsClient =
+        com.google.longrunning.OperationsClient.create(this.stub.getOperationsStub());
+    this.httpJsonOperationsClient = OperationsClient.create(this.stub.getHttpJsonOperationsStub());
   }
 
   public final CompletionServiceSettings getSettings() {
@@ -166,10 +186,18 @@ public CompletionServiceStub getStub() {
    * Returns the OperationsClient that can be used to query the status of a long-running operation
    * returned by another API method call.
    */
-  public final OperationsClient getOperationsClient() {
+  public final com.google.longrunning.OperationsClient getOperationsClient() {
     return operationsClient;
   }
 
+  /**
+   * Returns the OperationsClient that can be used to query the status of a long-running operation
+   * returned by another API method call.
+   */
+  public final OperationsClient getHttpJsonOperationsClient() {
+    return httpJsonOperationsClient;
+  }
+
   // AUTO-GENERATED DOCUMENTATION AND METHOD.
   /**
    * Completes the specified prefix with keyword suggestions.

google-cloud-retail/src/main/java/com/google/cloud/retail/v2/CompletionServiceSettings.java

@@ -21,6 +21,7 @@
 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;
@@ -113,11 +114,18 @@ public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilde
     return CompletionServiceStubSettings.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 CompletionServiceStubSettings.defaultGrpcTransportProviderBuilder();
   }
 
+  /** Returns a builder for the default REST ChannelProvider for this service. */
+  @BetaApi
+  public static InstantiatingHttpJsonChannelProvider.Builder
+      defaultHttpJsonTransportProviderBuilder() {
+    return CompletionServiceStubSettings.defaultHttpJsonTransportProviderBuilder();
+  }
+
   public static TransportChannelProvider defaultTransportChannelProvider() {
     return CompletionServiceStubSettings.defaultTransportChannelProvider();
   }
@@ -127,11 +135,17 @@ public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuil
     return CompletionServiceStubSettings.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);
@@ -169,6 +183,11 @@ private static Builder createDefault() {
       return new Builder(CompletionServiceStubSettings.newBuilder());
     }
 
+    @BetaApi
+    private static Builder createHttpJsonDefault() {
+      return new Builder(CompletionServiceStubSettings.newHttpJsonBuilder());
+    }
+
     public CompletionServiceStubSettings.Builder getStubSettingsBuilder() {
       return ((CompletionServiceStubSettings.Builder) getStubSettings());
     }

google-cloud-retail/src/main/java/com/google/cloud/retail/v2/PredictionServiceClient.java

@@ -101,6 +101,21 @@
  *     PredictionServiceClient.create(predictionServiceSettings);
  * }</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.
+ * PredictionServiceSettings predictionServiceSettings =
+ *     PredictionServiceSettings.newBuilder()
+ *         .setTransportChannelProvider(
+ *             PredictionServiceSettings.defaultHttpJsonTransportProviderBuilder().build())
+ *         .build();
+ * PredictionServiceClient predictionServiceClient =
+ *     PredictionServiceClient.create(predictionServiceSettings);
+ * }</pre>
+ *
  * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
  */
 @Generated("by gapic-generator-java")

google-cloud-retail/src/main/java/com/google/cloud/retail/v2/PredictionServiceSettings.java

@@ -21,6 +21,7 @@
 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;
@@ -98,11 +99,18 @@ public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilde
     return PredictionServiceStubSettings.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 PredictionServiceStubSettings.defaultGrpcTransportProviderBuilder();
   }
 
+  /** Returns a builder for the default REST ChannelProvider for this service. */
+  @BetaApi
+  public static InstantiatingHttpJsonChannelProvider.Builder
+      defaultHttpJsonTransportProviderBuilder() {
+    return PredictionServiceStubSettings.defaultHttpJsonTransportProviderBuilder();
+  }
+
   public static TransportChannelProvider defaultTransportChannelProvider() {
     return PredictionServiceStubSettings.defaultTransportChannelProvider();
   }
@@ -112,11 +120,17 @@ public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuil
     return PredictionServiceStubSettings.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);
@@ -154,6 +168,11 @@ private static Builder createDefault() {
       return new Builder(PredictionServiceStubSettings.newBuilder());
     }
 
+    @BetaApi
+    private static Builder createHttpJsonDefault() {
+      return new Builder(PredictionServiceStubSettings.newHttpJsonBuilder());
+    }
+
     public PredictionServiceStubSettings.Builder getStubSettingsBuilder() {
       return ((PredictionServiceStubSettings.Builder) getStubSettings());
     }