Exposing TransportChannelProvider & CredentialsProvider

google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreOptions.java

@@ -17,6 +17,10 @@
 package com.google.cloud.firestore;
 
 import com.google.api.core.InternalApi;
+import com.google.api.gax.core.CredentialsProvider;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.rpc.TransportChannelProvider;
 import com.google.cloud.ServiceDefaults;
 import com.google.cloud.ServiceOptions;
 import com.google.cloud.TransportOptions;
@@ -26,6 +30,7 @@
 import com.google.cloud.grpc.GrpcTransportOptions;
 import com.google.common.collect.ImmutableSet;
 import java.io.IOException;
+import java.util.Objects;
 import java.util.Set;
 import javax.annotation.Nonnull;
 
@@ -38,11 +43,12 @@ public final class FirestoreOptions extends ServiceOptions<Firestore, FirestoreO
           .add("https://www.googleapis.com/auth/cloud-platform")
           .add("https://www.googleapis.com/auth/datastore")
           .build();
-  private static final String DEFAULT_HOST = FirestoreSettings.getDefaultEndpoint();
-  private static final String DEFAULT_DATABASE_ID = "(default)";
-  private static final long serialVersionUID = -5853552236134770088L;
+
+  private static final long serialVersionUID = -5853552236134770089L;
 
   private final String databaseId;
+  private final TransportChannelProvider channelProvider;
+  private final CredentialsProvider credentialsProvider;
 
   public static class DefaultFirestoreFactory implements FirestoreFactory {
 
@@ -82,53 +88,123 @@ protected boolean projectIdRequired() {
 
   @Override
   protected String getDefaultHost() {
-    return DEFAULT_HOST;
+    return FirestoreDefaults.INSTANCE.getHost();
   }
 
   public String getDatabaseId() {
     return databaseId;
   }
 
+  public CredentialsProvider getCredentialsProvider() {
+    return credentialsProvider;
+  }
+
+  public TransportChannelProvider getTransportChannelProvider() {
+    return channelProvider;
+  }
+
   public static class Builder extends ServiceOptions.Builder<Firestore, FirestoreOptions, Builder> {
 
-    private String databaseId = DEFAULT_DATABASE_ID;
+    private String databaseId = FirestoreDefaults.INSTANCE.getDatabaseId();
+    private TransportChannelProvider channelProvider =
+        FirestoreDefaults.INSTANCE.getTransportChannelProvider();
+    private CredentialsProvider credentialsProvider =
+        FirestoreDefaults.INSTANCE.getCredentialsProvider();
 
     private Builder() {}
 
     private Builder(FirestoreOptions options) {
       super(options);
+      this.databaseId = options.databaseId;
+      this.channelProvider = options.channelProvider;
+      this.credentialsProvider = options.credentialsProvider;
     }
 
+    /**
+     * Sets the {@link TransportOptions} to use with this Firestore client.
+     *
+     * @param transportOptions A GrpcTransportOptions object that defines the transport options for
+     * this client.
+     */
     @Nonnull
     @Override
     public Builder setTransportOptions(@Nonnull TransportOptions transportOptions) {
       if (!(transportOptions instanceof GrpcTransportOptions)) {
         throw new IllegalArgumentException(
-            "Only grpc transport is allowed for " + API_SHORT_NAME + ".");
+            "Only GRPC transport is allowed for " + API_SHORT_NAME + ".");
       }
       return super.setTransportOptions(transportOptions);
     }
 
-    @Override
+    /**
+     * Sets the {@link TransportChannelProvider} to use with this Firestore client.
+     *
+     * @param channelProvider A InstantiatingGrpcChannelProvider object that defines the transport
+     * provider for this client.
+     */
     @Nonnull
-    public FirestoreOptions build() {
-      return new FirestoreOptions(this);
+    public Builder setChannelProvider(@Nonnull TransportChannelProvider channelProvider) {
+      if (!(channelProvider instanceof InstantiatingGrpcChannelProvider)) {
+        throw new IllegalArgumentException(
+            "Only GRPC channels are allowed for " + API_SHORT_NAME + ".");
+      }
+      this.channelProvider = channelProvider;
+      return this;
     }
 
+    /**
+     * Sets the {@link CredentialsProvider} to use with this Firestore client.
+     *
+     * @param credentialsProvider A GoogleCredentialsProvider object that defines the credential
+     * provider for this client.
+     */
+    @Nonnull
+    public Builder setCredentialsProvider(@Nonnull CredentialsProvider credentialsProvider) {
+      if (!(credentialsProvider instanceof GoogleCredentialsProvider)) {
+        throw new IllegalArgumentException(
+            "Only Google credentials are allowed for " + API_SHORT_NAME + ".");
+      }
+      this.credentialsProvider = credentialsProvider;
+      return this;
+    }
+
+    /**
+     * Sets the database ID to use with this Firestore client.
+     *
+     * @param databaseId The Firestore database ID to use with this client.
+     */
     public Builder setDatabaseId(String databaseId) {
       this.databaseId = databaseId;
       return this;
     }
+
+    @Override
+    @Nonnull
+    public FirestoreOptions build() {
+      return new FirestoreOptions(this);
+    }
   }
 
   @InternalApi("This class should only be extended within google-cloud-java")
   protected FirestoreOptions(Builder builder) {
     super(FirestoreFactory.class, FirestoreRpcFactory.class, builder, new FirestoreDefaults());
 
     this.databaseId = builder.databaseId;
+    this.channelProvider = builder.channelProvider;
+    this.credentialsProvider = builder.credentialsProvider;
   }
 
   private static class FirestoreDefaults implements ServiceDefaults<Firestore, FirestoreOptions> {
+    private static final FirestoreDefaults INSTANCE = new FirestoreDefaults();
+
+    private final String HOST = FirestoreSettings.getDefaultEndpoint();
+    private final String DATABASE_ID = "(default)";
+    private final GrpcTransportOptions TRANSPORT_OPTIONS =
+        getDefaultTransportOptionsBuilder().build();
+    private final TransportChannelProvider CHANNEL_PROVIDER =
+        getDefaultTransportChannelProviderBuilder().build();
+    private final CredentialsProvider CREDENTIALS_PROVIDER =
+        getDefaultCredentialsProviderBuilder().build();
 
     @Nonnull
     @Override
@@ -144,14 +220,45 @@ public FirestoreRpcFactory getDefaultRpcFactory() {
 
     @Nonnull
     @Override
-    public TransportOptions getDefaultTransportOptions() {
-      return getDefaultGrpcTransportOptions();
+    public GrpcTransportOptions getDefaultTransportOptions() {
+      return TRANSPORT_OPTIONS;
+    }
+
+    @Nonnull
+    TransportChannelProvider getTransportChannelProvider() {
+      return CHANNEL_PROVIDER;
+    }
+
+    @Nonnull
+    String getHost() {
+      return HOST;
+    }
+
+    @Nonnull
+    String getDatabaseId() {
+      return DATABASE_ID;
     }
+
+    @Nonnull
+    CredentialsProvider getCredentialsProvider() {
+      return CREDENTIALS_PROVIDER;
+    }
+  }
+
+  @Nonnull
+  public static GrpcTransportOptions.Builder getDefaultTransportOptionsBuilder() {
+    return GrpcTransportOptions.newBuilder();
   }
 
   @Nonnull
-  public static GrpcTransportOptions getDefaultGrpcTransportOptions() {
-    return GrpcTransportOptions.newBuilder().build();
+  public static InstantiatingGrpcChannelProvider.Builder
+      getDefaultTransportChannelProviderBuilder() {
+    return FirestoreSettings.defaultGrpcTransportProviderBuilder();
+  }
+
+  @Nonnull
+  public static GoogleCredentialsProvider.Builder getDefaultCredentialsProviderBuilder() {
+    return FirestoreSettings.defaultCredentialsProviderBuilder();
   }
 
   @Override
@@ -164,13 +271,22 @@ FirestoreRpc getFirestoreRpc() {
   }
 
   @Override
-  public boolean equals(Object obj) {
-    return obj instanceof FirestoreOptions && baseEquals((FirestoreOptions) obj);
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    FirestoreOptions that = (FirestoreOptions) o;
+    return Objects.equals(databaseId, that.databaseId)
+        && Objects.equals(channelProvider, that.channelProvider)
+        && baseEquals(that);
   }
 
   @Override
   public int hashCode() {
-    return baseHashCode();
+    return Objects.hash(databaseId, channelProvider, baseHashCode());
   }
 
   @Nonnull

google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/spi/v1beta1/GrpcFirestoreRpc.java

@@ -21,7 +21,6 @@
 import com.google.api.gax.core.GaxProperties;
 import com.google.api.gax.grpc.GrpcCallContext;
 import com.google.api.gax.grpc.GrpcTransportChannel;
-import com.google.api.gax.rpc.ApiClientHeaderProvider;
 import com.google.api.gax.rpc.BidiStreamingCallable;
 import com.google.api.gax.rpc.ClientContext;
 import com.google.api.gax.rpc.HeaderProvider;
@@ -105,11 +104,8 @@ public GrpcFirestoreRpc(final FirestoreOptions options) throws IOException {
         DatabaseRootName databaseName =
             DatabaseRootName.of(options.getProjectId(), options.getDatabaseId());
 
-        settingsBuilder.setCredentialsProvider(
-            GrpcTransportOptions.setUpCredentialsProvider(options));
-        settingsBuilder.setTransportChannelProvider(
-            GrpcTransportOptions.setUpChannelProvider(
-                FirestoreSettings.defaultGrpcTransportProviderBuilder(), options));
+        settingsBuilder.setCredentialsProvider(options.getCredentialsProvider());
+        settingsBuilder.setTransportChannelProvider(options.getTransportChannelProvider());
 
         HeaderProvider internalHeaderProvider =
             FirestoreSettings.defaultApiClientHeaderProviderBuilder()