Not able to connect to Dialogflow RPC API with an agent hosted in us-central region

[rmkol]

Problem

I have an agent created in the us-central1 region. Currently, it is not clear how to point this client to specific region using RPC API. When setting location id parameter to us-central1, exception is always thrown (see more details below). Setting endpoint to us-central1-dialogflow.googleapis.com:433 doesn't work either.

Environment details

1. API: Dialogflox CX "detectIntent" over gRPC protocol
2. OS type and version: macOS Sonoma
3. Java version: 17
4. Version(s): 0.55.0

Steps to reproduce

1. Create an agent in the us-central1 location
2. Construct session path by specifying correct project-id, location-id (us-central1), agent-id and session-id
3. Construct basic QueryInput and DetectIntentRequest objects
4. Create new session client with default settings using SessionsClient.create()
5. Issue "detect intent" request using sessionsClient.detectIntent
6. Following exception is thrown: Caused by: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Please refer to https://cloud.google.com/dialogflow/cx/docs/concept/region#avail and https://cloud.google.com/dialogflow/es/docs/how/region#regions to find the correct endpoint to access resources located in 'us-central1'.

Code example

String projectId = "hidden";
        String locationId = "us-central1";
        String agentId = "hidden";
        String sessionId = "hidden";
        String languageCode = "en";

        String sessionPath =
                SessionName.of(projectId, locationId, agentId, sessionId).toString();

        QueryInput queryInput =
                QueryInput.newBuilder()
                        .setText(TextInput.newBuilder().setText("hello").build())
                        .setLanguageCode(languageCode)
                        .build();

        DetectIntentRequest detectIntentRequest =
                DetectIntentRequest.newBuilder()
                        .setSession(sessionPath)
                        .setQueryInput(queryInput)
                        .build();
        SessionsClient sessionsClient = SessionsClient.create();
        DetectIntentResponse response = sessionsClient.detectIntent(detectIntentRequest);
        System.out.println(response);

Stack trace

Exception in thread "main" com.google.api.gax.rpc.InvalidArgumentException: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Please refer to https://cloud.google.com/dialogflow/cx/docs/concept/region#avail and https://cloud.google.com/dialogflow/es/docs/how/region#regions to find the correct endpoint to access resources located in 'us-central1'.
	at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:92)
	at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:41)
	at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:86)
	at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:66)
	at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.onFailure(GrpcExceptionCallable.java:97)
	at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:84)
	at com.google.common.util.concurrent.Futures$CallbackListener.run(Futures.java:1130)
	at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:31)
	at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1298)
	at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:1059)
	at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:809)
	at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:568)
	at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:538)
	at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
	at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
	at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
	at com.google.api.gax.grpc.ChannelPool$ReleasingClientCall$1.onClose(ChannelPool.java:570)
	at io.grpc.internal.DelayedClientCall$DelayedListener$3.run(DelayedClientCall.java:489)
	at io.grpc.internal.DelayedClientCall$DelayedListener.delayOrExecute(DelayedClientCall.java:453)
	at io.grpc.internal.DelayedClientCall$DelayedListener.onClose(DelayedClientCall.java:486)
	at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:574)
	at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:72)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:742)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:723)
	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)
	Suppressed: com.google.api.gax.rpc.AsyncTaskException: Asynchronous task failed
		at com.google.api.gax.rpc.ApiExceptions.callAndTranslateApiException(ApiExceptions.java:57)
		at com.google.api.gax.rpc.UnaryCallable.call(UnaryCallable.java:112)
		at com.google.cloud.dialogflow.cx.v3.SessionsClient.detectIntent(SessionsClient.java:326)
		at org.example.Main.main(Main.java:39)
Caused by: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Please refer to https://cloud.google.com/dialogflow/cx/docs/concept/region#avail and https://cloud.google.com/dialogflow/es/docs/how/region#regions to find the correct endpoint to access resources located in 'us-central1'.
	at io.grpc.Status.asRuntimeException(Status.java:533)
	... 17 more

Additional information

When setting location id to global, things start to work. But then my agent cannot be found, because it wasn't created in the global location obviously.
NOTE: Everything works fine when switching to the InstantiatingHttpJsonChannelProvider transport. But it would be great if we could use RPC for better efficiency.

[lqiu96]

Thanks for reporting this, I'm taking a look at this.

Setting endpoint to us-central1-dialogflow.googleapis.com:433 doesn't work either.

Could you provide a code sample/ snippet that shows how you are setting this endpoint value?

Everything works fine when switching to the InstantiatingHttpJsonChannelProvider transport.

Similarly, could you provide a code sample/ snippet that shows how you're switching to REST?

The endpoint computed when using Dialogflow would be dialogflow.googleapis.com:443 and from the docs, it seems like you would need us-central1-dialogflow.googleapis.com:433. I'm not sure why one transport works and the other doesn't.

[zhumin8]

Closing due to lack of response from reporter. Please feel free to reopen if this is still an issue for you!