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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.filedistribution;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.FileReference;
import com.yahoo.jrt.Int32Value;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.StringValue;
import com.yahoo.vespa.config.Connection;
import com.yahoo.vespa.config.ConnectionPool;
import java.io.File;
import java.time.Duration;
import java.time.Instant;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Downloads file reference using rpc requests to config server and keeps track of files being downloaded
*
* @author hmusum
*/
public class FileReferenceDownloader {
private final static Logger log = Logger.getLogger(FileReferenceDownloader.class.getName());
private final ExecutorService downloadExecutor =
Executors.newFixedThreadPool(Math.max(8, Runtime.getRuntime().availableProcessors()),
new DaemonThreadFactory("filereference downloader"));
private final ConnectionPool connectionPool;
/* Ongoing downloads */
private final Downloads downloads = new Downloads();
/* Status for ongoing and finished downloads */
private final Downloads.DownloadStatuses downloadStatuses = new Downloads.DownloadStatuses();
private final Duration downloadTimeout;
private final Duration sleepBetweenRetries;
private final Duration rpcTimeout;
FileReferenceDownloader(File downloadDirectory, File tmpDirectory, ConnectionPool connectionPool, Duration timeout, Duration sleepBetweenRetries) {
this.connectionPool = connectionPool;
this.downloadTimeout = timeout;
this.sleepBetweenRetries = sleepBetweenRetries;
// Needed to receive RPC calls receiveFile* from server after asking for files
new FileReceiver(connectionPool.getSupervisor(), this, downloadDirectory, tmpDirectory);
String timeoutString = System.getenv("VESPA_CONFIGPROXY_FILEDOWNLOAD_RPC_TIMEOUT");
this.rpcTimeout = Duration.ofSeconds(timeoutString == null ? 30 : Integer.parseInt(timeoutString));
}
private void startDownload(FileReferenceDownload fileReferenceDownload) {
FileReference fileReference = fileReferenceDownload.fileReference();
Instant end = Instant.now().plus(downloadTimeout);
boolean downloadStarted = false;
int retryCount = 0;
do {
try {
if (startDownloadRpc(fileReferenceDownload, retryCount)) {
downloadStarted = true;
} else {
retryCount++;
long sleepTime = Math.min(sleepBetweenRetries.toMillis() * retryCount,
Math.max(0, Duration.between(Instant.now(), end).toMillis()));
Thread.sleep(sleepTime);
}
}
catch (InterruptedException e) { /* ignored */}
} while (Instant.now().isBefore(end) && !downloadStarted);
if ( !downloadStarted) {
fileReferenceDownload.future().completeExceptionally(new RuntimeException("Failed getting file reference '" + fileReference.value() + "'"));
downloads.remove(fileReference);
}
}
Future<Optional<File>> download(FileReferenceDownload fileReferenceDownload) {
FileReference fileReference = fileReferenceDownload.fileReference();
Optional<FileReferenceDownload> inProgress = downloads.get(fileReference);
if (inProgress.isPresent()) return inProgress.get().future();
log.log(Level.FINE, () -> "Will download file reference '" + fileReference.value() + "' with timeout " + downloadTimeout);
downloads.add(fileReferenceDownload);
downloadStatuses.add(fileReference);
downloadExecutor.submit(() -> startDownload(fileReferenceDownload));
return fileReferenceDownload.future();
}
void completedDownloading(FileReference fileReference, File file) {
Optional<FileReferenceDownload> download = downloads.get(fileReference);
if (download.isPresent()) {
downloadStatuses.get(fileReference).ifPresent(Downloads.DownloadStatus::finished);
downloads.remove(fileReference);
download.get().future().complete(Optional.of(file));
} else {
log.log(Level.FINE, () -> "Received '" + fileReference + "', which was not requested. Can be ignored if happening during upgrades/restarts");
}
}
void failedDownloading(FileReference fileReference) {
downloadStatuses.get(fileReference).ifPresent(d -> d.setProgress(0.0));
downloads.remove(fileReference);
}
private boolean startDownloadRpc(FileReferenceDownload fileReferenceDownload, int retryCount) {
Connection connection = connectionPool.getCurrent();
Request request = new Request("filedistribution.serveFile");
String fileReference = fileReferenceDownload.fileReference().value();
request.parameters().add(new StringValue(fileReference));
request.parameters().add(new Int32Value(fileReferenceDownload.downloadFromOtherSourceIfNotFound() ? 0 : 1));
connection.invokeSync(request, (double) rpcTimeout.getSeconds());
Level logLevel = (retryCount > 50 ? Level.INFO : Level.FINE);
if (validateResponse(request)) {
log.log(Level.FINE, () -> "Request callback, OK. Req: " + request + "\nSpec: " + connection + ", retry count " + retryCount);
if (request.returnValues().get(0).asInt32() == 0) {
log.log(Level.FINE, () -> "Found file reference '" + fileReference + "' available at " + connection.getAddress());
return true;
} else {
log.log(logLevel, "File reference '" + fileReference + "' not found at " + connection.getAddress());
connectionPool.switchConnection(connection);
return false;
}
} else {
log.log(logLevel, () -> "Downloading file " + fileReference + " from " + connection.getAddress() + " failed: " +
request + ", error: " + request.errorMessage() + ", will use another config server for next request" +
" (retry count " + retryCount + ", rpc timeout " + rpcTimeout.getSeconds() + ")");
connectionPool.setError(connection, request.errorCode());
return false;
}
}
boolean isDownloading(FileReference fileReference) {
return downloads.get(fileReference).isPresent();
}
private boolean validateResponse(Request request) {
if (request.isError()) {
return false;
} else if (request.returnValues().size() == 0) {
return false;
} else if (!request.checkReturnTypes("is")) { // TODO: Do not hard-code return type
log.log(Level.WARNING, "Invalid return types for response: " + request.errorMessage());
return false;
}
return true;
}
double downloadStatus(String file) {
double status = 0.0;
Optional<Downloads.DownloadStatus> downloadStatus = downloadStatuses.get(new FileReference(file));
if (downloadStatus.isPresent()) {
status = downloadStatus.get().progress();
}
return status;
}
void setDownloadStatus(FileReference fileReference, double completeness) {
Optional<Downloads.DownloadStatus> downloadStatus = downloadStatuses.get(fileReference);
if (downloadStatus.isPresent())
downloadStatus.get().setProgress(completeness);
else
downloadStatuses.add(fileReference, completeness);
}
Map<FileReference, Double> downloadStatus() {
return downloadStatuses.all().values().stream().collect(Collectors.toMap(Downloads.DownloadStatus::fileReference, Downloads.DownloadStatus::progress));
}
public ConnectionPool connectionPool() {
return connectionPool;
}
public void close() {
downloadExecutor.shutdown();
try {
downloadExecutor.awaitTermination(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
Thread.interrupted(); // Ignore and continue shutdown.
}
}
}
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