[java-datastore] Datastore: When using grpc as transport with an emulator, requests are still sent to the google service

[fp7]

2. OS type and version: google-cloud-datastore 2.33.0
3. Java version: openjdk 25

Steps to reproduce

1. Start a firestore emulator in datastore mode gcloud emulators firestore start --database-mode=datastore-mode --host-port "localhost:8082"
2. Try to connect to it with grpc

Code example

DatastoreOptions.newBuilder()
            .setHost("localhost:8082")
            .setProjectId("project")
            .setTransportOptions(GrpcTransportOptions.newBuilder()
                .build())
            .build()
            .getService()

The requests will go to the google apis instead of the emulator.

I think the problem is within com.google.cloud.datastore.spi.v1.GrpcDatastoreRpc
The lines https://github.com/googleapis/java-datastore/blob/83fb5cffaa091766eb0827921f2549d3e6d98363/google-cloud-datastore/src/main/java/com/google/cloud/datastore/spi/v1/GrpcDatastoreRpc.java#L82-L89 override the channelprovider unconditionally. I think they should only do that, when isEmulator(datastoreOptions) is false

[jinseopkim0]

If you have a support contract with Google, please create an issue in the support console instead of filing on GitHub. This will ensure a timely response.