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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.annotation.TargetApi;
import android.app.job.JobWorkItem;
import android.content.Context;
import android.net.Uri;
import android.text.TextUtils;
import com.android.dialer.common.concurrent.ThreadUtil;
import com.android.dialer.logging.DialerImpression;
import com.android.dialer.logging.Logger;
import com.android.voicemail.impl.VvmLog;
import com.android.voicemail.impl.transcribe.TranscriptionService.JobCallback;
import com.android.voicemail.impl.transcribe.grpc.TranscriptionClient;
import com.android.voicemail.impl.transcribe.grpc.TranscriptionClientFactory;
import com.google.internal.communications.voicemailtranscription.v1.AudioFormat;
import com.google.internal.communications.voicemailtranscription.v1.TranscribeVoicemailRequest;
import com.google.protobuf.ByteString;
import io.grpc.Status;
import java.io.IOException;
import java.io.InputStream;
/**
* Background task to get a voicemail transcription and update the database.
*
* <pre>
* This task performs the following steps:
* 1. Update the transcription-state in the database to 'in-progress'
* 2. Create grpc client and transcription request
* 3. Make synchronous grpc transcription request to backend server
* 3a. On response
* Update the database with transcription (if successful) and new transcription-state
* 3b. On network error
* If retry-count < max then increment retry-count and retry the request
* Otherwise update the transcription-state in the database to 'transcription-failed'
* 4. Notify the callback that the work item is complete
* </pre>
*/
public class TranscriptionTask implements Runnable {
private static final String TAG = "TranscriptionTask";
private final Context context;
private final JobCallback callback;
private final JobWorkItem workItem;
private final TranscriptionClientFactory clientFactory;
private final Uri voicemailUri;
private final TranscriptionDbHelper databaseHelper;
private ByteString audioData;
private AudioFormat encoding;
private static final int MAX_RETRIES = 2;
static final String AMR_PREFIX = "#!AMR\n";
public TranscriptionTask(
Context context,
JobCallback callback,
JobWorkItem workItem,
TranscriptionClientFactory clientFactory) {
this.context = context;
this.callback = callback;
this.workItem = workItem;
this.clientFactory = clientFactory;
this.voicemailUri = getVoicemailUri(workItem);
databaseHelper = new TranscriptionDbHelper(context, voicemailUri);
}
@Override
public void run() {
VvmLog.i(TAG, "run");
if (readAndValidateAudioFile()) {
updateTranscriptionState(VoicemailCompat.TRANSCRIPTION_IN_PROGRESS);
transcribeVoicemail();
} else {
updateTranscriptionState(VoicemailCompat.TRANSCRIPTION_FAILED);
}
ThreadUtil.postOnUiThread(
() -> {
callback.onWorkCompleted(workItem);
});
}
private void transcribeVoicemail() {
VvmLog.i(TAG, "transcribeVoicemail");
TranscribeVoicemailRequest request = makeRequest();
TranscriptionClient client = clientFactory.getClient();
String transcript = null;
for (int i = 0; transcript == null && i < MAX_RETRIES; i++) {
VvmLog.i(TAG, "transcribeVoicemail, try: " + (i + 1));
if (i == 0) {
Logger.get(context).logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_REQUEST_SENT);
} else {
Logger.get(context).logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_REQUEST_RETRY);
}
TranscriptionClient.TranscriptionResponseWrapper responseWrapper =
client.transcribeVoicemail(request);
if (responseWrapper.status != null) {
VvmLog.i(TAG, "transcribeVoicemail, status: " + responseWrapper.status.getCode());
if (shouldRetryRequest(responseWrapper.status)) {
Logger.get(context)
.logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_RESPONSE_RECOVERABLE_ERROR);
backoff(i);
} else {
Logger.get(context)
.logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_RESPONSE_FATAL_ERROR);
break;
}
} else if (responseWrapper.response != null) {
if (!TextUtils.isEmpty(responseWrapper.response.getTranscript())) {
VvmLog.i(TAG, "transcribeVoicemail, got response");
transcript = responseWrapper.response.getTranscript();
Logger.get(context)
.logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_RESPONSE_SUCCESS);
} else {
VvmLog.i(TAG, "transcribeVoicemail, empty transcription");
Logger.get(context).logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_RESPONSE_EMPTY);
}
} else {
VvmLog.w(TAG, "transcribeVoicemail, no response");
Logger.get(context).logImpression(DialerImpression.Type.VVM_TRANSCRIPTION_RESPONSE_INVALID);
}
}
int newState =
(transcript == null)
? VoicemailCompat.TRANSCRIPTION_FAILED
: VoicemailCompat.TRANSCRIPTION_AVAILABLE;
updateTranscriptionAndState(transcript, newState);
}
private static boolean shouldRetryRequest(Status status) {
return status.getCode() == Status.Code.UNAVAILABLE;
}
private static void backoff(int retryCount) {
VvmLog.i(TAG, "backoff, count: " + retryCount);
try {
long millis = (1 << retryCount) * 1000;
Thread.sleep(millis);
} catch (InterruptedException e) {
VvmLog.w(TAG, "interrupted");
Thread.currentThread().interrupt();
}
}
private void updateTranscriptionAndState(String transcript, int newState) {
databaseHelper.setTranscriptionAndState(transcript, newState);
}
private void updateTranscriptionState(int newState) {
databaseHelper.setTranscriptionState(newState);
}
private TranscribeVoicemailRequest makeRequest() {
return TranscribeVoicemailRequest.newBuilder()
.setVoicemailData(audioData)
.setAudioFormat(encoding)
.build();
}
// Uses try-with-resource
@TargetApi(android.os.Build.VERSION_CODES.M)
private boolean readAndValidateAudioFile() {
if (voicemailUri == null) {
VvmLog.i(TAG, "Transcriber.readAndValidateAudioFile, file not found.");
return false;
} else {
VvmLog.i(TAG, "Transcriber.readAndValidateAudioFile, reading: " + voicemailUri);
}
try (InputStream in = context.getContentResolver().openInputStream(voicemailUri)) {
audioData = ByteString.readFrom(in);
VvmLog.i(TAG, "Transcriber.readAndValidateAudioFile, read " + audioData.size() + " bytes");
} catch (IOException e) {
VvmLog.e(TAG, "Transcriber.readAndValidateAudioFile", e);
return false;
}
if (audioData.startsWith(ByteString.copyFromUtf8(AMR_PREFIX))) {
encoding = AudioFormat.AMR_NB_8KHZ;
} else {
VvmLog.i(TAG, "Transcriber.readAndValidateAudioFile, unknown encoding");
encoding = AudioFormat.AUDIO_FORMAT_UNSPECIFIED;
return false;
}
return true;
}
private static Uri getVoicemailUri(JobWorkItem workItem) {
return workItem.getIntent().getParcelableExtra(TranscriptionService.EXTRA_VOICEMAIL_URI);
}
}
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