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Code Issues Releases Wiki Activity

Caching partially downloaded media data.

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This commit is contained in:
Fabian Schlenz 2016-07-14 19:47:10 +02:00
parent fc7d3fdcbc
commit f460d2307a
1 changed files with 20 additions and 4 deletions
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24
src/main/java/de/fabianonline/telegram_backup/DownloadManager.java
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@ -43,6 +43,8 @@ import java.util.List;
import java.util.Random;
import java.net.URL;
import java.util.concurrent.TimeoutException;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import org.apache.commons.io.FileUtils;
@ -267,8 +269,21 @@ public class DownloadManager {
private static boolean downloadFileFromDc(TelegramClient client, String target, TLAbsInputFileLocation loc, Integer dcID, int size) throws RpcErrorException, IOException {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(target);
String temp_filename = target + ".downloading";
Log.debug("Temporary filename %s", temp_filename);
int offset = 0;
if (new File(temp_filename).isFile()) {
Log.debug("Temporary filename already exists; continuing this file");
offset = (int)new File(temp_filename).length();
if (offset >= size) {
Log.debug("Temporary file size is >= the target size. Assuming corrupt file & deleting it");
new File(temp_filename).delete();
offset = 0;
}
}
Log.debug("offset before the loop is %d", offset);
fos = new FileOutputStream(temp_filename, true);
TLFile response;
do {
int block_size = Config.FILE_DOWNLOAD_BLOCK_SIZES[new Random().nextInt(Config.FILE_DOWNLOAD_BLOCK_SIZES.length)];
@ -285,23 +300,24 @@ public class DownloadManager {
Log.debug("response: %8d total size: %8d", response.getBytes().getData().length, offset);
fos.write(response.getBytes().getData());
fos.flush();
try { Thread.sleep(Config.DELAY_AFTER_GET_FILE); } catch(InterruptedException e) {}
} while(offset < size && response.getBytes().getData().length>0);
fos.close();
if (offset < size) {
System.out.println("Requested file " + target + " with " + size + " bytes, but got only " + offset + " bytes.");
new File(target).delete();
new File(temp_filename).delete();
System.exit(1);
}
Log.debug("Renaming %s to %s", temp_filename, target);
Files.move(new File(temp_filename).toPath(), new File(target).toPath(), StandardCopyOption.REPLACE_EXISTING);
return true;
} catch (java.io.IOException ex) {
if (fos!=null) fos.close();
new File(target).delete();
System.out.println("IOException happened while downloading " + target);
throw ex;
} catch (RpcErrorException ex) {
if (fos!=null) fos.close();
new File(target).delete();
System.out.println("RpcErrorException happened while downloading " + target);
throw ex;
}