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kuksa-sdk/src/main/kotlin/org/eclipse/kuksa/DataBrokerApiInteraction.kt
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| /* | ||
| * Copyright (c) 2023 Contributors to the Eclipse Foundation | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| */ | ||
|
|
||
| package org.eclipse.kuksa | ||
|
|
||
| import io.grpc.Context | ||
| import io.grpc.ManagedChannel | ||
| import io.grpc.StatusRuntimeException | ||
| import kotlinx.coroutines.CoroutineDispatcher | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.withContext | ||
| import org.eclipse.kuksa.proto.v1.KuksaValV1 | ||
| import org.eclipse.kuksa.proto.v1.Types | ||
| import org.eclipse.kuksa.proto.v1.Types.Field | ||
| import org.eclipse.kuksa.proto.v1.VALGrpc | ||
| import org.eclipse.kuksa.subscription.Subscription | ||
|
|
||
| /** | ||
| * Encapsulates the interactions with the DataBroker using gRPC. | ||
| */ | ||
| internal class DataBrokerApiInteraction( | ||
| private val managedChannel: ManagedChannel, | ||
| private val defaultDispatcher: CoroutineDispatcher = Dispatchers.Default, | ||
| ) { | ||
| /** | ||
| * Sends a request to the DataBroker to respond with the specified [vssPath] and [fields] values. | ||
| * | ||
| * Throws a [DataBrokerException] in case the connection to the DataBroker is no longer active | ||
| */ | ||
| suspend fun fetchProperty( | ||
| vssPath: String, | ||
| fields: List<Field>, | ||
| ): KuksaValV1.GetResponse { | ||
| return withContext(defaultDispatcher) { | ||
| val blockingStub = VALGrpc.newBlockingStub(managedChannel) | ||
| val entryRequest = KuksaValV1.EntryRequest.newBuilder() | ||
| .setPath(vssPath) | ||
| .addAllFields(fields) | ||
| .build() | ||
| val request = KuksaValV1.GetRequest.newBuilder() | ||
| .addEntries(entryRequest) | ||
| .build() | ||
|
|
||
| return@withContext try { | ||
| blockingStub.get(request) | ||
| } catch (e: StatusRuntimeException) { | ||
| throw DataBrokerException(e.message, e) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Sends a request to the DataBroker to update the specified [fields] of the [vssPath] and replace it's value with | ||
| * the specified [updatedDatapoint]. | ||
| * | ||
| * Throws a [DataBrokerException] in case the connection to the DataBroker is no longer active | ||
| */ | ||
| suspend fun updateProperty( | ||
| vssPath: String, | ||
| fields: List<Field>, | ||
| updatedDatapoint: Types.Datapoint, | ||
| ): KuksaValV1.SetResponse { | ||
| return withContext(defaultDispatcher) { | ||
| val blockingStub = VALGrpc.newBlockingStub(managedChannel) | ||
| val dataEntry = Types.DataEntry.newBuilder() | ||
| .setPath(vssPath) | ||
| .setValue(updatedDatapoint) | ||
| .build() | ||
| val entryUpdate = KuksaValV1.EntryUpdate.newBuilder() | ||
| .setEntry(dataEntry) | ||
| .addAllFields(fields) | ||
| .build() | ||
| val request = KuksaValV1.SetRequest.newBuilder() | ||
| .addUpdates(entryUpdate) | ||
| .build() | ||
|
|
||
| return@withContext try { | ||
| blockingStub.set(request) | ||
| } catch (e: StatusRuntimeException) { | ||
| throw DataBrokerException(e.message, e) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Sends a request to the DataBroker to subscribe to updates of the specified [vssPath] and [field]. | ||
| * Returns a [Subscription] which can be used to register or unregister additional listeners or cancel / closing | ||
| * the subscription. | ||
| * | ||
| * Throws a [DataBrokerException] in case the connection to the DataBroker is no longer active | ||
| */ | ||
| fun subscribe( | ||
| vssPath: String, | ||
| field: Field, | ||
| ): Subscription { | ||
| val asyncStub = VALGrpc.newStub(managedChannel) | ||
|
|
||
| val subscribeEntry = KuksaValV1.SubscribeEntry.newBuilder() | ||
| .setPath(vssPath) | ||
| .addFields(field) | ||
| .build() | ||
|
|
||
| val request = KuksaValV1.SubscribeRequest.newBuilder() | ||
| .addEntries(subscribeEntry) | ||
| .build() | ||
|
|
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| val currentContext = Context.current() | ||
| val cancellableContext = currentContext.withCancellation() | ||
|
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| val subscription = Subscription(vssPath, field, cancellableContext) | ||
| cancellableContext.run { | ||
| try { | ||
| val streamObserver = subscription.SubscriptionStreamObserver() | ||
| asyncStub.subscribe(request, streamObserver) | ||
| } catch (e: StatusRuntimeException) { | ||
| throw DataBrokerException(e.message, e) | ||
| } | ||
| } | ||
|
|
||
| return subscription | ||
| } | ||
| } |
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