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// Copyright Vespa.ai. 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.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.io.IOUtils;
import com.yahoo.vespa.config.util.ConfigUtils;
import com.yahoo.vespa.filedistribution.FileDownloader;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.time.Duration;
import java.time.Instant;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import static java.nio.file.Files.readAttributes;
import static java.util.logging.Level.INFO;
/**
* Deletes file references and url downloads that have not been used for some time.
* See {@link com.yahoo.vespa.config.proxy.filedistribution.RequestTracker} for how we track
* when a file reference or download was last used.
*
* @author hmusum
*/
class FileReferencesAndDownloadsMaintainer implements Runnable {
private static final Logger log = Logger.getLogger(FileReferencesAndDownloadsMaintainer.class.getName());
private static final File defaultUrlDownloadDir = UrlDownloadRpcServer.defaultDownloadDirectory;
private static final File defaultFileReferencesDownloadDir = FileDownloader.defaultDownloadDirectory;
private static final Duration defaultDurationToKeepFiles = Duration.ofDays(30);
private static final int defaultOutdatedFilesToKeep = 20;
private static final Duration interval = Duration.ofMinutes(1);
private final Optional<ScheduledExecutorService> executor;
private final File urlDownloadDir;
private final File fileReferencesDownloadDir;
private final Duration durationToKeepFiles;
private final int outDatedFilesToKeep;
FileReferencesAndDownloadsMaintainer() {
this(defaultFileReferencesDownloadDir, defaultUrlDownloadDir, keepFileReferencesDuration(),
outDatedFilesToKeep(), configServers());
}
FileReferencesAndDownloadsMaintainer(File fileReferencesDownloadDir,
File urlDownloadDir,
Duration durationToKeepFiles,
int outdatedFilesToKeep,
List<String> configServers) {
this.fileReferencesDownloadDir = fileReferencesDownloadDir;
this.urlDownloadDir = urlDownloadDir;
this.durationToKeepFiles = durationToKeepFiles;
this.outDatedFilesToKeep = outdatedFilesToKeep;
// Do not run on config servers
if (configServers.contains(ConfigUtils.getCanonicalHostName())) {
log.log(INFO, "Not running maintainer, since this is on a config server host");
executor = Optional.empty();
} else {
executor = Optional.of(new ScheduledThreadPoolExecutor(1, new DaemonThreadFactory("file references and downloads cleanup")));
executor.get().scheduleAtFixedRate(this, interval.toSeconds(), interval.toSeconds(), TimeUnit.SECONDS);
}
}
@Override
public void run() {
if (executor.isEmpty()) return;
try {
deleteUnusedFiles(fileReferencesDownloadDir);
deleteUnusedFiles(urlDownloadDir);
} catch (Throwable t) {
log.log(Level.WARNING, "Deleting unused files failed. ", t);
}
}
public void close() {
executor.ifPresent(ex -> {
ex.shutdownNow();
try {
if (! ex.awaitTermination(10, TimeUnit.SECONDS))
throw new RuntimeException("Unable to shutdown " + executor + " before timeout");
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
});
}
private void deleteUnusedFiles(File directory) {
File[] files = directory.listFiles();
if (files == null) return;
List<File> filesToDelete = filesThatCanBeDeleted(files);
filesToDelete.forEach(fileReference -> {
if (IOUtils.recursiveDeleteDir(fileReference))
log.log(Level.FINE, "Deleted " + fileReference.getAbsolutePath());
else
log.log(Level.WARNING, "Could not delete " + fileReference.getAbsolutePath());
});
}
private List<File> filesThatCanBeDeleted(File[] files) {
Instant deleteNotUsedSinceInstant = Instant.now().minus(durationToKeepFiles);
Set<File> filesOnDisk = new HashSet<>(List.of(files));
log.log(Level.FINE, () -> "Files on disk: " + filesOnDisk);
int deleteCount = Math.max(0, filesOnDisk.size() - outDatedFilesToKeep);
var canBeDeleted = filesOnDisk
.stream()
.peek(file -> log.log(Level.FINE, () -> file + ":" + fileLastModifiedTime(file.toPath())))
.filter(fileReference -> isFileLastModifiedBefore(fileReference, deleteNotUsedSinceInstant))
.sorted(Comparator.comparing(fileReference -> fileLastModifiedTime(fileReference.toPath())))
.toList();
// Make sure we keep some files
canBeDeleted = canBeDeleted.subList(0, Math.min(canBeDeleted.size(), deleteCount));
if (canBeDeleted.size() > 0)
log.log(INFO, "Files that can be deleted (not accessed since " + deleteNotUsedSinceInstant +
", will also keep " + outDatedFilesToKeep +
" no matter when last accessed): " + canBeDeleted);
return canBeDeleted;
}
private boolean isFileLastModifiedBefore(File fileReference, Instant instant) {
return fileLastModifiedTime(fileReference.toPath()).isBefore(instant);
}
private static Instant fileLastModifiedTime(Path fileReference) {
try {
BasicFileAttributes fileAttributes = readAttributes(fileReference, BasicFileAttributes.class);
return fileAttributes.lastModifiedTime().toInstant();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static Duration keepFileReferencesDuration() {
String env = System.getenv("VESPA_KEEP_FILE_REFERENCES_DAYS");
if (env != null && !env.isEmpty())
return Duration.ofDays(Integer.parseInt(env));
else
return defaultDurationToKeepFiles;
}
private static int outDatedFilesToKeep() {
String env = System.getenv("VESPA_KEEP_FILE_REFERENCES_COUNT");
if (env != null && !env.isEmpty())
return Integer.parseInt(env);
else
return defaultOutdatedFilesToKeep;
}
private static List<String> configServers() {
String env = System.getenv("VESPA_CONFIGSERVERS");
if (env == null || env.isEmpty())
return List.of(ConfigUtils.getCanonicalHostName());
else {
return List.of(env.split(","));
}
}
}
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