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feat(firestore): add x-goog-is-transaction routing header #14680

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feat(firestore): add x-goog-is-transaction routing header
nikhilchowdary Oct 17, 2026
b2ce40f
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nikhilchowdary Oct 17, 2026
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refactor(firestore): use named static classes for routing header call…
nikhilchowdary Oct 22, 2026
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116 changes: 104 additions & 12 deletions ...gle-cloud-firestore/src/main/java/com/google/cloud/firestore/spi/v1/GrpcFirestoreRpc.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,15 +16,18 @@

package com.google.cloud.firestore.spi.v1;

import com.google.api.core.ApiFuture;
import com.google.api.gax.core.BackgroundResource;
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.retrying.RetrySettings;
import com.google.api.gax.rpc.ApiCallContext;
import com.google.api.gax.rpc.BidiStreamingCallable;
import com.google.api.gax.rpc.ClientContext;
import com.google.api.gax.rpc.HeaderProvider;
import com.google.api.gax.rpc.NoHeaderProvider;
import com.google.api.gax.rpc.ResponseObserver;
import com.google.api.gax.rpc.ServerStreamingCallable;
import com.google.api.gax.rpc.TransportChannel;
import com.google.api.gax.rpc.UnaryCallable;
Expand All @@ -41,6 +44,9 @@
import com.google.cloud.firestore.v1.stub.GrpcFirestoreStub;
import com.google.cloud.grpc.GrpcTransportOptions;
import com.google.cloud.grpc.GrpcTransportOptions.ExecutorFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.firestore.v1.BatchGetDocumentsRequest;
import com.google.firestore.v1.BatchGetDocumentsResponse;
import com.google.firestore.v1.BatchWriteRequest;
Expand Down Expand Up @@ -70,20 +76,37 @@
import java.util.Collections;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Predicate;

/**
* GRPC client implementation of the Firestore RPC methods. Exposes FirestoreOptions on top of the
* GRPC-based Firestore GAPIC client.
*/
public class GrpcFirestoreRpc implements FirestoreRpc {

private static final ApiCallContext TRANSACTION_CALL_CONTEXT =
GrpcCallContext.createDefault()
.withExtraHeaders(ImmutableMap.of("x-goog-is-transaction", ImmutableList.of("true")));

private static final ApiCallContext NON_TRANSACTION_CALL_CONTEXT =
GrpcCallContext.createDefault()
.withExtraHeaders(ImmutableMap.of("x-goog-is-transaction", ImmutableList.of("false")));

private final FirestoreStub firestoreStub;
private final ScheduledExecutorService executor;
private final ExecutorFactory<ScheduledExecutorService> executorFactory;
private final ClientContext clientContext;

private boolean closed;

@VisibleForTesting
GrpcFirestoreRpc(FirestoreStub firestoreStub) {
this.firestoreStub = firestoreStub;
this.executor = null;
this.executorFactory = null;
this.clientContext = null;
}

public GrpcFirestoreRpc(final FirestoreOptions options) throws IOException {
GrpcTransportOptions transportOptions = (GrpcTransportOptions) options.getTransportOptions();
executorFactory = transportOptions.getExecutorFactory();
Expand Down Expand Up @@ -221,69 +244,138 @@ public ScheduledExecutorService getExecutor() {

@Override
public UnaryCallable<CommitRequest, CommitResponse> commitCallable() {
return firestoreStub.commitCallable();
return withRoutingHeaders(
firestoreStub.commitCallable(), req -> !req.getTransaction().isEmpty());
}

@Override
public UnaryCallable<BatchWriteRequest, BatchWriteResponse> batchWriteCallable() {
return firestoreStub.batchWriteCallable();
return firestoreStub.batchWriteCallable().withDefaultCallContext(NON_TRANSACTION_CALL_CONTEXT);
}

@Override
public ServerStreamingCallable<BatchGetDocumentsRequest, BatchGetDocumentsResponse>
batchGetDocumentsCallable() {
return firestoreStub.batchGetDocumentsCallable();
return withRoutingHeaders(
firestoreStub.batchGetDocumentsCallable(),
req -> !req.getTransaction().isEmpty() || req.hasNewTransaction());
}

@Override
public ServerStreamingCallable<RunQueryRequest, RunQueryResponse> runQueryCallable() {
return firestoreStub.runQueryCallable();
return withRoutingHeaders(
firestoreStub.runQueryCallable(),
req -> !req.getTransaction().isEmpty() || req.hasNewTransaction());
}

@Override
public ServerStreamingCallable<ExecutePipelineRequest, ExecutePipelineResponse>
executePipelineCallable() {
return firestoreStub.executePipelineCallable();
return withRoutingHeaders(
firestoreStub.executePipelineCallable(),
req -> !req.getTransaction().isEmpty() || req.hasNewTransaction());
}

@Override
public ServerStreamingCallable<RunAggregationQueryRequest, RunAggregationQueryResponse>
runAggregationQueryCallable() {
return firestoreStub.runAggregationQueryCallable();
return withRoutingHeaders(
firestoreStub.runAggregationQueryCallable(),
req -> !req.getTransaction().isEmpty() || req.hasNewTransaction());
}

@Override
public UnaryCallable<BeginTransactionRequest, BeginTransactionResponse>
beginTransactionCallable() {
return firestoreStub.beginTransactionCallable();
return firestoreStub
.beginTransactionCallable()
.withDefaultCallContext(TRANSACTION_CALL_CONTEXT);
}

@Override
public UnaryCallable<RollbackRequest, Empty> rollbackCallable() {
return firestoreStub.rollbackCallable();
return firestoreStub.rollbackCallable().withDefaultCallContext(TRANSACTION_CALL_CONTEXT);
}

@Override
public UnaryCallable<ListCollectionIdsRequest, ListCollectionIdsPagedResponse>
listCollectionIdsPagedCallable() {
return firestoreStub.listCollectionIdsPagedCallable();
return firestoreStub
.listCollectionIdsPagedCallable()
.withDefaultCallContext(NON_TRANSACTION_CALL_CONTEXT);
}

@Override
public UnaryCallable<PartitionQueryRequest, FirestoreClient.PartitionQueryPagedResponse>
partitionQueryPagedCallable() {
return firestoreStub.partitionQueryPagedCallable();
return firestoreStub
.partitionQueryPagedCallable()
.withDefaultCallContext(NON_TRANSACTION_CALL_CONTEXT);
}

@Override
public UnaryCallable<ListDocumentsRequest, ListDocumentsPagedResponse>
listDocumentsPagedCallable() {
return firestoreStub.listDocumentsPagedCallable();
return withRoutingHeaders(
firestoreStub.listDocumentsPagedCallable(), req -> !req.getTransaction().isEmpty());
}

@Override
public BidiStreamingCallable<ListenRequest, ListenResponse> listenCallable() {
return firestoreStub.listenCallable();
return firestoreStub.listenCallable().withDefaultCallContext(NON_TRANSACTION_CALL_CONTEXT);
}

private static <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> withRoutingHeaders(
UnaryCallable<RequestT, ResponseT> callable, Predicate<RequestT> isTransaction) {
return new RoutingMetadataUnaryCallable<>(callable, isTransaction);
}

private static <RequestT, ResponseT>
ServerStreamingCallable<RequestT, ResponseT> withRoutingHeaders(
ServerStreamingCallable<RequestT, ResponseT> callable,
Predicate<RequestT> isTransaction) {
return new RoutingMetadataServerStreamingCallable<>(callable, isTransaction);
}

private static class RoutingMetadataUnaryCallable<RequestT, ResponseT>
extends UnaryCallable<RequestT, ResponseT> {
private final UnaryCallable<RequestT, ResponseT> callable;
private final Predicate<RequestT> isTransaction;

RoutingMetadataUnaryCallable(
UnaryCallable<RequestT, ResponseT> callable, Predicate<RequestT> isTransaction) {
this.callable = callable;
this.isTransaction = isTransaction;
}

@Override
public ApiFuture<ResponseT> futureCall(RequestT request, ApiCallContext thisCallContext) {
ApiCallContext defaultContext =
isTransaction.test(request) ? TRANSACTION_CALL_CONTEXT : NON_TRANSACTION_CALL_CONTEXT;
return callable.futureCall(request, defaultContext.merge(thisCallContext));
}
}

private static class RoutingMetadataServerStreamingCallable<RequestT, ResponseT>
extends ServerStreamingCallable<RequestT, ResponseT> {
private final ServerStreamingCallable<RequestT, ResponseT> callable;
private final Predicate<RequestT> isTransaction;

RoutingMetadataServerStreamingCallable(
ServerStreamingCallable<RequestT, ResponseT> callable, Predicate<RequestT> isTransaction) {
this.callable = callable;
this.isTransaction = isTransaction;
}

@Override
public void call(
RequestT request,
ResponseObserver<ResponseT> responseObserver,
ApiCallContext thisCallContext) {
ApiCallContext defaultContext =
isTransaction.test(request) ? TRANSACTION_CALL_CONTEXT : NON_TRANSACTION_CALL_CONTEXT;
callable.call(request, responseObserver, defaultContext.merge(thisCallContext));
}
}
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nikhilchowdary marked this conversation as resolved.

// This class is needed solely to get access to protected method setInternalHeaderProvider()
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