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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.filedistribution;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.ListenableFuture;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.FileReference;
import com.yahoo.jrt.ErrorCode;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.StringValue;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.config.Connection;
import com.yahoo.vespa.config.ConnectionPool;
import java.io.File;
import java.time.Duration;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
/**
* Downloads file reference using rpc requests to config server and keeps track of files being downloaded
* <p>
* Some methods are synchronized to make sure access to downloads is atomic
*
* @author hmusum
*/
// TODO: Handle shutdown of executors
public class FileReferenceDownloader {
private final static Logger log = Logger.getLogger(FileReferenceDownloader.class.getName());
private final static Duration rpcTimeout = Duration.ofSeconds(10);
private final ExecutorService downloadExecutor =
Executors.newFixedThreadPool(10, new DaemonThreadFactory("filereference downloader"));
private final ConnectionPool connectionPool;
private final Map<FileReference, FileReferenceDownload> downloads = new LinkedHashMap<>();
private final Map<FileReference, Double> downloadStatus = new HashMap<>(); // between 0 and 1
private final Duration downloadTimeout;
private final FileReceiver fileReceiver;
FileReferenceDownloader(File downloadDirectory, File tmpDirectory, ConnectionPool connectionPool, Duration timeout) {
this.connectionPool = connectionPool;
this.downloadTimeout = timeout;
this.fileReceiver = new FileReceiver(connectionPool.getSupervisor(), this, downloadDirectory, tmpDirectory);
}
private void startDownload(Duration timeout, FileReferenceDownload fileReferenceDownload) {
FileReference fileReference = fileReferenceDownload.fileReference();
synchronized (downloads) {
downloads.put(fileReference, fileReferenceDownload);
downloadStatus.put(fileReference, 0.0);
}
long end = System.currentTimeMillis() + timeout.toMillis();
boolean downloadStarted = false;
while ((System.currentTimeMillis() < end) && !downloadStarted) {
try {
if (startDownloadRpc(fileReference)) {
downloadStarted = true;
} else {
Thread.sleep(10);
}
}
catch (InterruptedException e) { /* ignored */}
}
if ( !downloadStarted) {
fileReferenceDownload.future().setException(new RuntimeException("Failed getting file reference '" + fileReference.value() + "'"));
synchronized (downloads) {
downloads.remove(fileReference);
}
}
}
void addToDownloadQueue(FileReferenceDownload fileReferenceDownload) {
log.log(LogLevel.DEBUG, "Will download file reference '" + fileReferenceDownload.fileReference().value() + "' with timeout " + downloadTimeout);
downloadExecutor.submit(() -> startDownload(downloadTimeout, fileReferenceDownload));
}
void receiveFile(FileReferenceData fileReferenceData) {
fileReceiver.receiveFile(fileReferenceData);
}
void completedDownloading(FileReference fileReference, File file) {
synchronized (downloads) {
FileReferenceDownload download = downloads.get(fileReference);
if (download != null) {
downloadStatus.put(fileReference, 1.0);
downloads.remove(fileReference);
download.future().set(Optional.of(file));
} else {
log.log(LogLevel.INFO, "Received '" + fileReference + "', which was not requested. Can be ignored if happening during upgrades/restarts");
}
}
}
private boolean startDownloadRpc(FileReference fileReference) {
Connection connection = connectionPool.getCurrent();
Request request = new Request("filedistribution.serveFile");
request.parameters().add(new StringValue(fileReference.value()));
execute(request, connection);
if (validateResponse(request)) {
log.log(LogLevel.DEBUG, "Request callback, OK. Req: " + request + "\nSpec: " + connection);
if (request.returnValues().get(0).asInt32() == 0) {
log.log(LogLevel.DEBUG, "Found file reference '" + fileReference.value() + "' available at " + connection.getAddress());
return true;
} else {
log.log(LogLevel.INFO, "File reference '" + fileReference.value() + "' not found for " + connection.getAddress());
connectionPool.setNewCurrentConnection();
return false;
}
} else {
log.log(LogLevel.WARNING, "Request failed. Req: " + request + "\nSpec: " + connection.getAddress() +
", error code: " + request.errorCode());
if (request.isError() && request.errorCode() == ErrorCode.CONNECTION || request.errorCode() == ErrorCode.TIMEOUT) {
log.log(LogLevel.WARNING, "Setting error for connection " + connection.getAddress());
connectionPool.setError(connection, request.errorCode());
}
return false;
}
}
boolean isDownloading(FileReference fileReference) {
synchronized (downloads) {
return downloads.containsKey(fileReference);
}
}
ListenableFuture<Optional<File>> addDownloadListener(FileReference fileReference, Runnable runnable) {
synchronized (downloads) {
FileReferenceDownload download = downloads.get(fileReference);
if (download != null) {
download.future().addListener(runnable, downloadExecutor);
return download.future();
}
}
return null;
}
private void execute(Request request, Connection connection) {
connection.invokeSync(request, (double) rpcTimeout.getSeconds());
}
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(LogLevel.WARNING, "Invalid return types for response: " + request.errorMessage());
return false;
}
return true;
}
double downloadStatus(String file) {
double status = 0.0;
synchronized (downloads) {
Double download = downloadStatus.get(new FileReference(file));
if (download != null) {
status = download;
}
}
return status;
}
void setDownloadStatus(FileReference fileReference, double completeness) {
synchronized (downloads) {
downloadStatus.put(fileReference, completeness);
}
}
Map<FileReference, Double> downloadStatus() {
synchronized (downloads) {
return ImmutableMap.copyOf(downloadStatus);
}
}
public ConnectionPool connectionPool() {
return connectionPool;
}
}
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