NewPipe/app/src/main/java/us/shandian/giga/get/DownloadMissionRecover.java

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package us.shandian.giga.get;
import android.util.Log;
import org.schabi.newpipe.extractor.NewPipe;
import org.schabi.newpipe.extractor.StreamingService;
import org.schabi.newpipe.extractor.exceptions.ExtractionException;
import org.schabi.newpipe.extractor.stream.AudioStream;
import org.schabi.newpipe.extractor.stream.StreamExtractor;
import org.schabi.newpipe.extractor.stream.SubtitlesStream;
import org.schabi.newpipe.extractor.stream.VideoStream;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.HttpURLConnection;
import java.nio.channels.ClosedByInterruptException;
import java.util.List;
import us.shandian.giga.get.DownloadMission.HttpError;
import static us.shandian.giga.get.DownloadMission.ERROR_RESOURCE_GONE;
public class DownloadMissionRecover extends Thread {
private static final String TAG = "DownloadMissionRecover";
static final int mID = -3;
private final DownloadMission mMission;
private final boolean mNotInitialized;
private final int mErrCode;
private HttpURLConnection mConn;
private MissionRecoveryInfo mRecovery;
private StreamExtractor mExtractor;
DownloadMissionRecover(DownloadMission mission, int errCode) {
mMission = mission;
mNotInitialized = mission.blocks == null && mission.current == 0;
mErrCode = errCode;
}
@Override
public void run() {
if (mMission.source == null) {
mMission.notifyError(mErrCode, null);
return;
}
Exception err = null;
int attempt = 0;
while (attempt++ < mMission.maxRetry) {
try {
tryRecover();
return;
} catch (InterruptedIOException | ClosedByInterruptException e) {
return;
} catch (Exception e) {
if (!mMission.running || super.isInterrupted()) return;
err = e;
}
}
// give up
mMission.notifyError(mErrCode, err);
}
private void tryRecover() throws ExtractionException, IOException, HttpError {
if (mExtractor == null) {
try {
StreamingService svr = NewPipe.getServiceByUrl(mMission.source);
mExtractor = svr.getStreamExtractor(mMission.source);
mExtractor.fetchPage();
} catch (ExtractionException e) {
mExtractor = null;
throw e;
}
}
// maybe the following check is redundant
if (!mMission.running || super.isInterrupted()) return;
if (!mNotInitialized) {
// set the current download url to null in case if the recovery
// process is canceled. Next time start() method is called the
// recovery will be executed, saving time
mMission.urls[mMission.current] = null;
mRecovery = mMission.recoveryInfo[mMission.current];
resolveStream();
return;
}
Log.w(TAG, "mission is not fully initialized, this will take a while");
try {
for (; mMission.current < mMission.urls.length; mMission.current++) {
mRecovery = mMission.recoveryInfo[mMission.current];
if (test()) continue;
if (!mMission.running) return;
resolveStream();
if (!mMission.running) return;
// before continue, check if the current stream was resolved
if (mMission.urls[mMission.current] == null) {
break;
}
}
} finally {
mMission.current = 0;
}
mMission.writeThisToFile();
if (!mMission.running || super.isInterrupted()) return;
mMission.running = false;
mMission.start();
}
private void resolveStream() throws IOException, ExtractionException, HttpError {
// FIXME: this getErrorMessage() always returns "video is unavailable"
/*if (mExtractor.getErrorMessage() != null) {
mMission.notifyError(mErrCode, new ExtractionException(mExtractor.getErrorMessage()));
return;
}*/
String url = null;
switch (mRecovery.getKind()) {
case 'a':
for (AudioStream audio : mExtractor.getAudioStreams()) {
if (audio.average_bitrate == mRecovery.getDesiredBitrate() && audio.getFormat() == mRecovery.getFormat()) {
url = audio.getUrl();
break;
}
}
break;
case 'v':
List<VideoStream> videoStreams;
if (mRecovery.isDesired2())
videoStreams = mExtractor.getVideoOnlyStreams();
else
videoStreams = mExtractor.getVideoStreams();
for (VideoStream video : videoStreams) {
if (video.resolution.equals(mRecovery.getDesired()) && video.getFormat() == mRecovery.getFormat()) {
url = video.getUrl();
break;
}
}
break;
case 's':
for (SubtitlesStream subtitles : mExtractor.getSubtitles(mRecovery.getFormat())) {
String tag = subtitles.getLanguageTag();
if (tag.equals(mRecovery.getDesired()) && subtitles.isAutoGenerated() == mRecovery.isDesired2()) {
url = subtitles.getUrl();
break;
}
}
break;
default:
throw new RuntimeException("Unknown stream type");
}
resolve(url);
}
private void resolve(String url) throws IOException, HttpError {
if (mRecovery.getValidateCondition() == null) {
Log.w(TAG, "validation condition not defined, the resource can be stale");
}
if (mMission.unknownLength || mRecovery.getValidateCondition() == null) {
recover(url, false);
return;
}
///////////////////////////////////////////////////////////////////////
////// Validate the http resource doing a range request
/////////////////////
try {
mConn = mMission.openConnection(url, true, mMission.length - 10, mMission.length);
mConn.setRequestProperty("If-Range", mRecovery.getValidateCondition());
mMission.establishConnection(mID, mConn);
int code = mConn.getResponseCode();
switch (code) {
case 200:
case 413:
// stale
recover(url, true);
return;
case 206:
// in case of validation using the Last-Modified date, check the resource length
long[] contentRange = parseContentRange(mConn.getHeaderField("Content-Range"));
boolean lengthMismatch = contentRange[2] != -1 && contentRange[2] != mMission.length;
recover(url, lengthMismatch);
return;
}
throw new HttpError(code);
} finally {
disconnect();
}
}
private void recover(String url, boolean stale) {
Log.i(TAG,
String.format("recover() name=%s isStale=%s url=%s", mMission.storage.getName(), stale, url)
);
mMission.urls[mMission.current] = url;
if (url == null) {
mMission.urls = new String[0];
mMission.notifyError(ERROR_RESOURCE_GONE, null);
return;
}
if (mNotInitialized) return;
if (stale) {
mMission.resetState(false, false, DownloadMission.ERROR_NOTHING);
}
mMission.writeThisToFile();
if (!mMission.running || super.isInterrupted()) return;
mMission.running = false;
mMission.start();
}
private long[] parseContentRange(String value) {
long[] range = new long[3];
if (value == null) {
// this never should happen
return range;
}
try {
value = value.trim();
if (!value.startsWith("bytes")) {
return range;// unknown range type
}
int space = value.lastIndexOf(' ') + 1;
int dash = value.indexOf('-', space) + 1;
int bar = value.indexOf('/', dash);
// start
range[0] = Long.parseLong(value.substring(space, dash - 1));
// end
range[1] = Long.parseLong(value.substring(dash, bar));
// resource length
value = value.substring(bar + 1);
if (value.equals("*")) {
range[2] = -1;// unknown length received from the server but should be valid
} else {
range[2] = Long.parseLong(value);
}
} catch (Exception e) {
// nothing to do
}
return range;
}
private boolean test() {
if (mMission.urls[mMission.current] == null) return false;
try {
mConn = mMission.openConnection(mMission.urls[mMission.current], true, -1, -1);
mMission.establishConnection(mID, mConn);
if (mConn.getResponseCode() == 200) return true;
} catch (Exception e) {
// nothing to do
} finally {
disconnect();
}
return false;
}
private void disconnect() {
try {
try {
mConn.getInputStream().close();
} finally {
mConn.disconnect();
}
} catch (Exception e) {
// nothing to do
} finally {
mConn = null;
}
}
@Override
public void interrupt() {
super.interrupt();
if (mConn != null) disconnect();
}
}