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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.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import com.yahoo.config.FileReference;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.config.ConnectionPool;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.yolean.Exceptions;
import java.io.File;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Logger;
/**
* Handles downloads of files (file references only for now)
*
* @author hmusum
*/
public class FileDownloader {
private final static Logger log = Logger.getLogger(FileDownloader.class.getName());
private final File downloadDirectory;
private final Duration timeout;
private final FileReferenceDownloader fileReferenceDownloader;
public FileDownloader(ConnectionPool connectionPool) {
this(connectionPool,
new File(Defaults.getDefaults().underVespaHome("var/db/vespa/filedistribution")),
Duration.ofMinutes(15));
}
FileDownloader(ConnectionPool connectionPool, File downloadDirectory, Duration timeout) {
this.downloadDirectory = downloadDirectory;
this.timeout = timeout;
this.fileReferenceDownloader = new FileReferenceDownloader(downloadDirectory, connectionPool, timeout);
}
public Optional<File> getFile(FileReference fileReference) {
Objects.requireNonNull(fileReference, "file reference cannot be null");
File directory = new File(downloadDirectory, fileReference.value());
log.log(LogLevel.DEBUG, "Checking if there is a file in '" + directory.getAbsolutePath() + "' ");
Optional<File> file = getFileFromFileSystem(fileReference, directory);
if (file.isPresent()) {
return file;
} else {
log.log(LogLevel.INFO, "File reference '" + fileReference.value() + "' not found in " +
directory.getAbsolutePath() + ", starting download");
return queueForDownload(fileReference, timeout);
}
}
public void queueForDownload(List<FileReference> fileReferences) {
fileReferences.forEach(this::queueForDownload);
}
public void receiveFile(FileReference fileReference, String filename, byte[] content, long xxHash) {
fileReferenceDownloader.receiveFile(fileReference, filename, content, xxHash);
}
double downloadStatus(FileReference fileReference) {
return fileReferenceDownloader.downloadStatus(fileReference.value());
}
public Map<FileReference, Double> downloadStatus() {
return fileReferenceDownloader.downloadStatus();
}
File downloadDirectory() {
return downloadDirectory;
}
private Optional<File> getFileFromFileSystem(FileReference fileReference, File directory) {
File[] files = directory.listFiles();
if (directory.exists() && directory.isDirectory() && files != null && files.length > 0) {
if (files.length != 1) {
throw new RuntimeException("More than one file in '" + fileReference.value() +
"', expected only one, unable to proceed");
}
File file = files[0];
if (!file.exists()) {
throw new RuntimeException("File with reference '" + fileReference.value() +
"' does not exist");
} else if (!file.canRead()) {
throw new RuntimeException("File with reference '" + fileReference.value() +
"'exists, but unable to read it");
} else {
fileReferenceDownloader.setDownloadStatus(fileReference.value(), 100.0);
return Optional.of(file);
}
}
return Optional.empty();
}
private synchronized Optional<File> queueForDownload(FileReference fileReference, Duration timeout) {
if (fileReferenceDownloader.isDownloading(fileReference)) {
log.log(LogLevel.INFO, "Already downloading '" + fileReference.value() + "'");
ListenableFuture<Optional<File>> future =
fileReferenceDownloader.addDownloadListener(fileReference, () -> getFile(fileReference));
try {
return future.get();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException("Failed downloading file reference '" + fileReference.value() + "': " +
Exceptions.toMessageString(e));
}
}
SettableFuture<Optional<File>> future = SettableFuture.create();
queueForDownload(new FileReferenceDownload(fileReference, future));
log.log(LogLevel.INFO, "Queued '" + fileReference.value() + "' for download with timeout " + timeout);
try {
Optional<File> fileDownloaded;
try {
log.log(LogLevel.INFO, "Waiting for '" + fileReference.value() + "' to download");
fileDownloaded = future.get(timeout.getSeconds() - 1, TimeUnit.SECONDS);
log.log(LogLevel.INFO, "'" + fileReference.value() + "' downloaded");
} catch (TimeoutException e) {
log.log(LogLevel.WARNING, "Downloading '" + fileReference.value() + "' timed out");
return Optional.empty();
}
return fileDownloaded;
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException("Could not download '" + fileReference.value() + "'");
}
}
// We don't care about the future in this call
private synchronized void queueForDownload(FileReference fileReference) {
queueForDownload(new FileReferenceDownload(fileReference, SettableFuture.create()));
}
private synchronized void queueForDownload(FileReferenceDownload fileReferenceDownload) {
fileReferenceDownloader.addToDownloadQueue(fileReferenceDownload);
}
Set<FileReference> queuedDownloads() {
return fileReferenceDownloader.queuedDownloads();
}
}
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