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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.filedistribution;
import com.yahoo.cloud.config.ConfigserverConfig;
import com.yahoo.component.annotation.Inject;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.FileReference;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.jrt.Int32Value;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.StringValue;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Transport;
import com.yahoo.vespa.config.ConnectionPool;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.vespa.filedistribution.FileReferenceCompressor;
import com.yahoo.vespa.filedistribution.EmptyFileReferenceData;
import com.yahoo.vespa.filedistribution.FileDistributionConnectionPool;
import com.yahoo.vespa.filedistribution.FileDownloader;
import com.yahoo.vespa.filedistribution.FileReferenceData;
import com.yahoo.vespa.filedistribution.FileReferenceDownload;
import com.yahoo.vespa.filedistribution.LazyFileReferenceData;
import com.yahoo.vespa.filedistribution.LazyTemporaryStorageFileReferenceData;
import com.yahoo.yolean.Exceptions;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.logging.Level;
import java.util.logging.Logger;
import static com.yahoo.vespa.config.server.filedistribution.FileDistributionUtil.getOtherConfigServersInCluster;
import static com.yahoo.vespa.filedistribution.FileReferenceData.Type.compressed;
public class FileServer {
private static final Logger log = Logger.getLogger(FileServer.class.getName());
// Set this low, to make sure we don't wait for a long time trying to download file
private static final Duration timeout = Duration.ofSeconds(10);
private final FileDirectory root;
private final ExecutorService executor;
private final FileDownloader downloader;
private enum FileApiErrorCodes {
OK(0, "OK"),
NOT_FOUND(1, "Filereference not found");
private final int code;
private final String description;
FileApiErrorCodes(int code, String description) {
this.code = code;
this.description = description;
}
int getCode() { return code; }
String getDescription() { return description; }
}
public static class ReplayStatus {
private final int code;
private final String description;
ReplayStatus(int code, String description) {
this.code = code;
this.description = description;
}
public boolean ok() { return code == 0; }
public int getCode() { return code; }
public String getDescription() { return description; }
}
public interface Receiver {
void receive(FileReferenceData fileData, ReplayStatus status);
}
@SuppressWarnings("WeakerAccess") // Created by dependency injection
@Inject
public FileServer(ConfigserverConfig configserverConfig) {
this(new File(Defaults.getDefaults().underVespaHome(configserverConfig.fileReferencesDir())),
createFileDownloader(getOtherConfigServersInCluster(configserverConfig)));
}
// For testing only
public FileServer(File rootDir) {
this(rootDir, createFileDownloader(List.of()));
}
public FileServer(File rootDir, FileDownloader fileDownloader) {
this.downloader = fileDownloader;
this.root = new FileDirectory(rootDir);
this.executor = Executors.newFixedThreadPool(Math.max(8, Runtime.getRuntime().availableProcessors()),
new DaemonThreadFactory("file-server-"));
}
boolean hasFile(String fileReference) {
return hasFile(new FileReference(fileReference));
}
private boolean hasFile(FileReference reference) {
try {
return root.getFile(reference).exists();
} catch (IllegalArgumentException e) {
log.log(Level.FINE, () -> "Failed locating " + reference + ": " + e.getMessage());
}
return false;
}
FileDirectory getRootDir() { return root; }
void startFileServing(String fileName, Receiver target) {
FileReference reference = new FileReference(fileName);
File file = root.getFile(reference);
if (file.exists()) {
serveFile(reference, target);
}
}
private void serveFile(FileReference reference, Receiver target) {
File file = root.getFile(reference);
log.log(Level.FINE, () -> "Start serving " + reference + " with file '" + file.getAbsolutePath() + "'");
FileReferenceData fileData = EmptyFileReferenceData.empty(reference, file.getName());
try {
fileData = readFileReferenceData(reference);
target.receive(fileData, new ReplayStatus(0, "OK"));
log.log(Level.FINE, () -> "Done serving " + reference.value() + " with file '" + file.getAbsolutePath() + "'");
} catch (IOException e) {
String errorDescription = "For" + reference.value() + ": failed reading file '" + file.getAbsolutePath() + "'";
log.warning(errorDescription + " for sending to '" + target.toString() + "'. " + e.getMessage());
target.receive(fileData, new ReplayStatus(1, errorDescription));
} catch (Exception e) {
log.log(Level.WARNING, "Failed serving " + reference + ": " + Exceptions.toMessageString(e));
} finally {
fileData.close();
}
}
private FileReferenceData readFileReferenceData(FileReference reference) throws IOException {
File file = root.getFile(reference);
if (file.isDirectory()) {
Path tempFile = Files.createTempFile("filereferencedata", reference.value());
File compressedFile = new FileReferenceCompressor(compressed).compress(file.getParentFile(), tempFile.toFile());
return new LazyTemporaryStorageFileReferenceData(reference, file.getName(), compressed, compressedFile);
} else {
return new LazyFileReferenceData(reference, file.getName(), FileReferenceData.Type.file, file);
}
}
public void serveFile(String fileReference, boolean downloadFromOtherSourceIfNotFound, Request request, Receiver receiver) {
if (executor instanceof ThreadPoolExecutor)
log.log(Level.FINE, () -> "Active threads: " + ((ThreadPoolExecutor) executor).getActiveCount());
log.log(Level.FINE, () -> "Received request for file reference '" + fileReference + "' from " + request.target());
Instant deadline = Instant.now().plus(timeout);
executor.execute(() -> serveFileInternal(fileReference, downloadFromOtherSourceIfNotFound, request, receiver, deadline));
}
private void serveFileInternal(String fileReference,
boolean downloadFromOtherSourceIfNotFound,
Request request,
Receiver receiver,
Instant deadline) {
if (Instant.now().isAfter(deadline)) {
log.log(Level.INFO, () -> "Deadline exceeded for request for file reference '" + fileReference + "' from " + request.target() +
" , giving up");
return;
}
boolean fileExists;
try {
String client = request.target().toString();
FileReferenceDownload fileReferenceDownload = new FileReferenceDownload(new FileReference(fileReference),
client,
downloadFromOtherSourceIfNotFound);
fileExists = hasFileDownloadIfNeeded(fileReferenceDownload);
if (fileExists) startFileServing(fileReference, receiver);
} catch (IllegalArgumentException e) {
fileExists = false;
log.warning("Failed serving file reference '" + fileReference + "', request was from " + request.target() + ", with error " + e.toString());
}
FileApiErrorCodes result = fileExists ? FileApiErrorCodes.OK : FileApiErrorCodes.NOT_FOUND;
request.returnValues()
.add(new Int32Value(result.getCode()))
.add(new StringValue(result.getDescription()));
request.returnRequest();
}
boolean hasFileDownloadIfNeeded(FileReferenceDownload fileReferenceDownload) {
FileReference fileReference = fileReferenceDownload.fileReference();
if (hasFile(fileReference)) return true;
if (fileReferenceDownload.downloadFromOtherSourceIfNotFound()) {
log.log(Level.FINE, "File not found, downloading from another source");
// Create new FileReferenceDownload with downloadFromOtherSourceIfNotFound set to false
// to avoid config servers requesting a file reference perpetually, e.g. for a file that
// does not exist anymore
FileReferenceDownload newDownload = new FileReferenceDownload(fileReference,
fileReferenceDownload.client(),
false);
boolean fileExists = downloader.getFile(newDownload).isPresent();
if ( ! fileExists)
log.log(Level.WARNING, "Failed downloading '" + fileReferenceDownload + "'");
return fileExists;
} else {
log.log(Level.FINE, "File not found, will not download from another source, since request came from another config server");
return false;
}
}
public FileDownloader downloader() { return downloader; }
public void close() {
downloader.close();
executor.shutdown();
}
private static FileDownloader createFileDownloader(List<String> configServers) {
Supervisor supervisor = new Supervisor(new Transport("filedistribution-pool")).setDropEmptyBuffers(true);
return new FileDownloader(configServers.isEmpty()
? FileDownloader.emptyConnectionPool()
: createConnectionPool(configServers, supervisor),
supervisor,
timeout);
}
private static ConnectionPool createConnectionPool(List<String> configServers, Supervisor supervisor) {
ConfigSourceSet configSourceSet = new ConfigSourceSet(configServers);
if (configServers.size() == 0) return FileDownloader.emptyConnectionPool();
return new FileDistributionConnectionPool(configSourceSet, supervisor);
}
}
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