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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.server.filedistribution;
import com.google.inject.Inject;
import com.yahoo.cloud.config.ConfigserverConfig;
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 java.util.logging.Level;
import com.yahoo.net.HostName;
import com.yahoo.vespa.config.Connection;
import com.yahoo.vespa.config.ConnectionPool;
import com.yahoo.vespa.config.JRTConnectionPool;
import com.yahoo.vespa.config.server.ConfigServerSpec;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.vespa.filedistribution.CompressedFileReference;
import com.yahoo.vespa.filedistribution.FileDownloader;
import com.yahoo.vespa.filedistribution.FileReferenceData;
import com.yahoo.vespa.filedistribution.FileReferenceDataBlob;
import com.yahoo.vespa.filedistribution.FileReferenceDownload;
import com.yahoo.vespa.filedistribution.LazyFileReferenceData;
import com.yahoo.yolean.Exceptions;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
import java.util.stream.Collectors;
public class FileServer {
private static final Logger log = Logger.getLogger(FileServer.class.getName());
private final FileDirectory root;
private final ExecutorService pushExecutor;
private final ExecutorService pullExecutor;
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(createConnectionPool(configserverConfig), new File(Defaults.getDefaults().underVespaHome(configserverConfig.fileReferencesDir())));
}
// For testing only
public FileServer(File rootDir) {
this(new EmptyConnectionPool(), rootDir);
}
private FileServer(ConnectionPool connectionPool, File rootDir) {
this.downloader = new FileDownloader(connectionPool);
this.root = new FileDirectory(rootDir);
this.pushExecutor = Executors.newFixedThreadPool(Math.max(8, Runtime.getRuntime().availableProcessors()));
this.pullExecutor = Executors.newFixedThreadPool(Math.max(8, Runtime.getRuntime().availableProcessors()));
}
boolean hasFile(String fileReference) {
return hasFile(new FileReference(fileReference));
}
FileDirectory getRootDir() {
return root;
}
private boolean hasFile(FileReference reference) {
try {
return root.getFile(reference).exists();
} catch (IllegalArgumentException e) {
log.log(Level.FINE, "Failed locating file reference '" + reference + "' with error " + e.toString());
}
return false;
}
void startFileServing(String fileName, Receiver target) {
FileReference reference = new FileReference(fileName);
File file = root.getFile(reference);
if (file.exists()) {
pushExecutor.execute(() -> serveFile(reference, target));
}
}
private void serveFile(FileReference reference, Receiver target) {
File file = root.getFile(reference);
log.log(Level.FINE, () -> "Start serving reference '" + reference.value() + "' with file '" + file.getAbsolutePath() + "'");
boolean success = false;
String errorDescription = "OK";
FileReferenceData fileData = FileReferenceDataBlob.empty(reference, file.getName());
try {
fileData = readFileReferenceData(reference);
success = true;
} catch (IOException e) {
errorDescription = "For file reference '" + reference.value() + "': failed reading file '" + file.getAbsolutePath() + "'";
log.warning(errorDescription + " for sending to '" + target.toString() + "'. " + e.toString());
}
try {
target.receive(fileData, new ReplayStatus(success ? 0 : 1, success ? "OK" : errorDescription));
log.log(Level.FINE, "Done serving file reference '" + reference.value() + "' with file '" + file.getAbsolutePath() + "'");
} catch (Exception e) {
log.log(Level.WARNING, "Failed serving file reference '" + reference.value() + "': " + Exceptions.toMessageString(e));
} finally {
fileData.close();
}
}
private FileReferenceData readFileReferenceData(FileReference reference) throws IOException {
File file = root.getFile(reference);
if (file.isDirectory()) {
//TODO Here we should compress to file, but then we have to clean up too. Pending.
byte [] blob = CompressedFileReference.compress(file.getParentFile());
return new FileReferenceDataBlob(reference, file.getName(), FileReferenceData.Type.compressed, blob);
} else {
return new LazyFileReferenceData(reference, file.getName(), FileReferenceData.Type.file, file);
}
}
public void serveFile(String fileReference, boolean downloadFromOtherSourceIfNotFound, Request request, Receiver receiver) {
pullExecutor.execute(() -> serveFileInternal(fileReference, downloadFromOtherSourceIfNotFound, request, receiver));
}
private void serveFileInternal(String fileReference, boolean downloadFromOtherSourceIfNotFound, Request request, Receiver receiver) {
log.log(Level.FINE, () -> "Received request for reference '" + fileReference + "' from " + request.target());
boolean fileExists;
try {
fileExists = hasFile(fileReference) || download(fileReference, downloadFromOtherSourceIfNotFound);
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();
}
// downloadFromOtherSourceIfNotFound is true when the request comes from another config server.
// This is to avoid config servers asking each other for a file that does not exist
private boolean download(String fileReference, boolean downloadFromOtherSourceIfNotFound) {
if (downloadFromOtherSourceIfNotFound) {
log.log(Level.FINE, "File not found, downloading from another source");
return download(fileReference).isPresent();
} else {
log.log(Level.FINE, "File not found, will not download from another source since request came from another config server");
return false;
}
}
private Optional<File> download(String fileReference) {
/* downloadFromOtherSourceIfNotFound should be false here, since this request is from a config server */
return downloader.getFile(new FileReferenceDownload(new FileReference(fileReference), false));
}
public FileDownloader downloader() {
return downloader;
}
public void close() {
downloader.close();
}
// Connection pool with all config servers except this one (might be an empty pool if there is only one config server)
private static ConnectionPool createConnectionPool(ConfigserverConfig configserverConfig) {
List<String> configServers = ConfigServerSpec.fromConfig(configserverConfig)
.stream()
.filter(spec -> !spec.getHostName().equals(HostName.getLocalhost()))
.map(spec -> "tcp/" + spec.getHostName() + ":" + spec.getConfigServerPort())
.collect(Collectors.toList());
return configServers.size() > 0 ? new JRTConnectionPool(new ConfigSourceSet(configServers)) : new EmptyConnectionPool();
}
private static class EmptyConnectionPool implements ConnectionPool {
@Override
public void close() {}
@Override
public void setError(Connection connection, int i) {}
@Override
public Connection getCurrent() { return null; }
@Override
public Connection setNewCurrentConnection() { return null; }
@Override
public int getSize() { return 0; }
@Override
public Supervisor getSupervisor() { return new Supervisor(new Transport()); }
}
}
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