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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.config.proxy.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.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.io.IOException;
import java.nio.file.Files;
import java.time.Duration;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
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
* <p>
* Some methods are synchronized to make sure access to downloads is atomic
*
* @author hmusum
*/
// TODO: Add retries when a config server does not have a file reference
// TODO: Handle shutdown of executors
class FileReferenceDownloader {
private final static Logger log = Logger.getLogger(FileReferenceDownloader.class.getName());
private final static Duration rpcTimeout = Duration.ofSeconds(10);
private final File downloadDirectory;
private final ExecutorService downloadExecutor =
Executors.newFixedThreadPool(10, new DaemonThreadFactory("filereference downloader"));
private ExecutorService readFromQueueExecutor =
Executors.newFixedThreadPool(1, new DaemonThreadFactory("filereference download queue"));
private final ConnectionPool connectionPool;
private final ConcurrentLinkedQueue<FileReferenceDownload> downloadQueue = new ConcurrentLinkedQueue<>();
private final Map<FileReference, FileReferenceDownload> downloads = new LinkedHashMap<>();
private final Map<FileReference, Double> downloadStatus = new HashMap<>();
private final Duration downloadTimeout;
FileReferenceDownloader(File downloadDirectory, ConnectionPool connectionPool, Duration timeout) {
this.downloadDirectory = downloadDirectory;
this.connectionPool = connectionPool;
this.downloadTimeout = timeout;
if (connectionPool != null)
readFromQueueExecutor.submit(this::readFromQueue);
}
private synchronized Optional<File> startDownload(FileReference fileReference,
Duration timeout,
FileReferenceDownload fileReferenceDownload)
throws ExecutionException, InterruptedException, TimeoutException {
downloads.put(fileReference, fileReferenceDownload);
setDownloadStatus(fileReference.value(), 0.0);
if (startDownloadRpc(fileReference))
return fileReferenceDownload.future().get(timeout.toMillis(), TimeUnit.MILLISECONDS);
else {
fileReferenceDownload.future().setException(new RuntimeException("Failed getting file"));
downloads.remove(fileReference);
return Optional.empty();
}
}
synchronized void addToDownloadQueue(FileReferenceDownload fileReferenceDownload) {
downloadQueue.add(fileReferenceDownload);
}
void receiveFile(FileReference fileReference, String filename, byte[] content) {
File fileReferenceDir = new File(downloadDirectory, fileReference.value());
try {
Files.createDirectories(fileReferenceDir.toPath());
File file = new File(fileReferenceDir, filename);
log.log(LogLevel.INFO, "Writing data to " + file.getAbsolutePath());
Files.write(file.toPath(), content);
completedDownloading(fileReference, file);
} catch (IOException e) {
log.log(LogLevel.ERROR, "Failed writing file: " + e.getMessage());
throw new RuntimeException("Failed writing file: ", e);
}
}
synchronized Set<FileReference> queuedDownloads() {
return downloadQueue.stream()
.map(FileReferenceDownload::fileReference)
.collect(Collectors.toCollection(LinkedHashSet::new));
}
private void readFromQueue() {
do {
FileReferenceDownload fileReferenceDownload = downloadQueue.poll();
if (fileReferenceDownload == null) {
try {
Thread.sleep(10);
} catch (InterruptedException e) { /* ignore for now */}
} else {
log.log(LogLevel.INFO, "Polling queue, found file reference '" +
fileReferenceDownload.fileReference().value() + "' to download");
downloadExecutor.submit(() -> startDownload(fileReferenceDownload.fileReference(), downloadTimeout, fileReferenceDownload));
}
} while (true);
}
private synchronized void completedDownloading(FileReference fileReference, File file) {
downloads.get(fileReference).future().set(Optional.of(file));
downloadStatus.put(fileReference, 100.0);
}
private boolean startDownloadRpc(FileReference fileReference) throws ExecutionException, InterruptedException {
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.INFO, "Found file reference '" + fileReference.value() + "' available at " + connection.getAddress());
else
log.log(LogLevel.INFO, "File reference '" + fileReference.value() + "' not found for " + connection.getAddress());
return true;
} else {
log.log(LogLevel.WARNING, "Request failed. Req: " + request + "\nSpec: " + connection.getAddress());
connection.setError(request.errorCode());
// TODO: Retry with another config server
return false;
}
}
synchronized boolean isDownloading(FileReference fileReference) {
return downloads.containsKey(fileReference);
}
synchronized ListenableFuture<Optional<File>> addDownloadListener(FileReference fileReference, Runnable runnable) {
FileReferenceDownload fileReferenceDownload = downloads.get(fileReference);
fileReferenceDownload.future().addListener(runnable, downloadExecutor);
return fileReferenceDownload.future();
}
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("i")) {
log.log(LogLevel.WARNING, "Invalid return types for response: " + request.errorMessage());
return false;
}
return true;
}
double downloadStatus(String file) {
return downloadStatus.getOrDefault(new FileReference(file), 0.0);
}
void setDownloadStatus(String file, double percentageDownloaded) {
downloadStatus.put(new FileReference(file), percentageDownloaded);
}
Map<FileReference, Double> downloadStatus() {
return ImmutableMap.copyOf(downloadStatus);
}
}
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