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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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
*/
package com.android.voicemail.impl.transcribe;
import android.app.job.JobWorkItem;
import android.content.Context;
import android.util.Pair;
import com.android.dialer.common.Assert;
import com.android.dialer.logging.DialerImpression;
import com.android.voicemail.impl.VvmLog;
import com.android.voicemail.impl.transcribe.TranscriptionService.JobCallback;
import com.android.voicemail.impl.transcribe.grpc.GetTranscriptResponseAsync;
import com.android.voicemail.impl.transcribe.grpc.TranscriptionClientFactory;
import com.android.voicemail.impl.transcribe.grpc.TranscriptionResponseAsync;
import com.google.internal.communications.voicemailtranscription.v1.GetTranscriptRequest;
import com.google.internal.communications.voicemailtranscription.v1.TranscribeVoicemailAsyncRequest;
import com.google.internal.communications.voicemailtranscription.v1.TranscriptionStatus;
/**
* Background task to get a voicemail transcription using the asynchronous API. The async API works
* as follows:
*
* <ol>
* <li>client uploads voicemail data to the server
* <li>server responds with a transcription-id and an estimated transcription wait time
* <li>client waits appropriate amount of time then begins polling for the result
* </ol>
*
* This implementation blocks until the response or an error is received, even though it is using
* the asynchronous server API.
*/
public class TranscriptionTaskAsync extends TranscriptionTask {
private static final String TAG = "TranscriptionTaskAsync";
public TranscriptionTaskAsync(
Context context,
JobCallback callback,
JobWorkItem workItem,
TranscriptionClientFactory clientFactory,
TranscriptionConfigProvider configProvider) {
super(context, callback, workItem, clientFactory, configProvider);
}
@Override
protected Pair<String, TranscriptionStatus> getTranscription() {
VvmLog.i(TAG, "getTranscription");
TranscriptionResponseAsync uploadResponse =
(TranscriptionResponseAsync)
sendRequest((client) -> client.sendUploadRequest(getUploadRequest()));
if (uploadResponse == null) {
VvmLog.i(TAG, "getTranscription, failed to upload voicemail.");
return new Pair<>(null, TranscriptionStatus.FAILED_NO_RETRY);
} else {
waitForTranscription(uploadResponse);
return pollForTranscription(uploadResponse);
}
}
@Override
protected DialerImpression.Type getRequestSentImpression() {
return DialerImpression.Type.VVM_TRANSCRIPTION_REQUEST_SENT_ASYNC;
}
private static void waitForTranscription(TranscriptionResponseAsync uploadResponse) {
long millis = uploadResponse.getEstimatedWaitMillis();
VvmLog.i(TAG, "waitForTranscription, " + millis + " millis");
sleep(millis);
}
private Pair<String, TranscriptionStatus> pollForTranscription(
TranscriptionResponseAsync uploadResponse) {
VvmLog.i(TAG, "pollForTranscription");
GetTranscriptRequest request = getGetTranscriptRequest(uploadResponse);
for (int i = 0; i < configProvider.getMaxGetTranscriptPolls(); i++) {
GetTranscriptResponseAsync response =
(GetTranscriptResponseAsync)
sendRequest((client) -> client.sendGetTranscriptRequest(request));
if (response == null) {
VvmLog.i(TAG, "pollForTranscription, no transcription result.");
} else if (response.isTranscribing()) {
VvmLog.i(TAG, "pollForTranscription, poll count: " + (i + 1));
} else if (response.hasFatalError()) {
VvmLog.i(TAG, "pollForTranscription, fail. " + response.getErrorDescription());
return new Pair<>(null, response.getTranscriptionStatus());
} else {
VvmLog.i(TAG, "pollForTranscription, got transcription");
return new Pair<>(response.getTranscript(), TranscriptionStatus.SUCCESS);
}
sleep(configProvider.getGetTranscriptPollIntervalMillis());
}
VvmLog.i(TAG, "pollForTranscription, timed out.");
return new Pair<>(null, TranscriptionStatus.FAILED_NO_RETRY);
}
private TranscribeVoicemailAsyncRequest getUploadRequest() {
return TranscribeVoicemailAsyncRequest.newBuilder()
.setVoicemailData(audioData)
.setAudioFormat(encoding)
.build();
}
private GetTranscriptRequest getGetTranscriptRequest(TranscriptionResponseAsync uploadResponse) {
Assert.checkArgument(uploadResponse.getTranscriptionId() != null);
return GetTranscriptRequest.newBuilder()
.setTranscriptionId(uploadResponse.getTranscriptionId())
.build();
}
}
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