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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.search.logging;
import ai.vespa.validation.Validation;
import com.yahoo.vespa.defaults.Defaults;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.stream.Stream;
/**
* Spooler that will write an entry to a file and read files that are ready to be sent.
* Files are written in JSON Lines text file format.
*
* @author hmusum
*/
public class Spooler {
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(Spooler.class.getName());
private static final Path defaultSpoolPath = Path.of(Defaults.getDefaults().underVespaHome("var/spool/vespa/events"));
private static final Comparator<File> ordering = new TimestampCompare();
private static final int defaultMaxEntriesPerFile = 100;
private Path processingPath;
private Path readyPath;
private Path failuresPath;
private Path successesPath;
AtomicInteger entryCounter = new AtomicInteger(1);
AtomicInteger fileCounter = new AtomicInteger(1);
private final Path spoolPath;
private final int maxEntriesPerFile;
public Spooler() {
this(defaultSpoolPath, defaultMaxEntriesPerFile);
}
public Spooler(Path spoolPath, int maxEntriesPerFile) {
this.spoolPath = spoolPath;
this.maxEntriesPerFile = maxEntriesPerFile;
createDirs(spoolPath);
}
void write(LoggerEntry entry) {
writeEntry(entry);
}
public void processFiles(Function<LoggerEntry, Boolean> transport) throws IOException {
List<Path> files = listFilesInPath(readyPath);
if (files.size() == 0) {
log.log(Level.INFO, "No files in ready path " + readyPath.toFile().getAbsolutePath());
return;
}
log.log(Level.FINE, "Files in ready path: " + files.size());
List<File> fileList = getFiles(files, 50); // TODO
if ( ! fileList.isEmpty()) {
processFiles(fileList, transport);
}
}
List<Path> listFilesInPath(Path path) throws IOException {
List<Path> files;
try (Stream<Path> stream = Files.list(path)) {
files = stream.toList();
// TODO: Or check if stream is empty
} catch (NoSuchFileException e) {
return List.of(); // No files, this is OK
}
return files;
}
public void processFiles(List<File> files, Function<LoggerEntry, Boolean> transport) {
for (File f : files) {
log.log(Level.FINE, "Processing file " + f);
boolean succcess = false;
try {
List<String> lines = Files.readAllLines(f.toPath());
for (String line : lines) {
LoggerEntry entry = LoggerEntry.deserialize(line);
log.log(Level.FINE, "Read entry " + entry + " from " + f);
succcess = transport.apply(entry);
if (! succcess) {
log.log(Level.WARNING, "unsuccessful call to transport() for " + entry);
}
};
} catch (IOException e) {
throw new UncheckedIOException("Unable to process file " + f.toPath(), e);
// TODO: Move to failures path
} finally {
if (succcess) {
Path file = f.toPath();
Path target = spoolPath.resolve(successesPath).resolve(f.toPath().relativize(file)).resolve(f.getName());
try {
Files.move(file, target);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}
}
}
public Path processingPath() { return processingPath; }
public Path readyPath() { return readyPath; }
public Path successesPath() { return successesPath; }
public Path failuresPath() { return failuresPath; }
List<File> getFiles(List<Path> files, int count) {
Validation.requireAtLeast(count, "count must be a positive number", 1);
List<File> fileList = new ArrayList<>();
for (Path p : files) {
File f = p.toFile();
if (!f.isDirectory()) {
fileList.add(f);
}
// Grab only some files
if (fileList.size() > count) {
break;
}
}
fileList.sort(ordering);
return fileList;
}
private void writeEntry(LoggerEntry entry) {
String fileName = String.valueOf(fileCounter);
Path file = spoolPath.resolve(processingPath).resolve(fileName);
try {
log.log(Level.FINE, "Writing entry " + entryCounter.get() + " (" + entry.serialize() + ") to file " + fileName);
Files.writeString(file, entry.serialize() + "\n", StandardOpenOption.WRITE, StandardOpenOption.APPEND, StandardOpenOption.CREATE);
Path target = spoolPath.resolve(readyPath).resolve(file.relativize(file)).resolve(fileName);
if (entryCounter.incrementAndGet() > maxEntriesPerFile) {
log.log(Level.INFO, "Moving file from " + file + " to " + target);
Files.move(file, target);
entryCounter.set(1);
fileCounter.incrementAndGet();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void createDirs(Path spoolerPath) {
processingPath = createDir(spoolerPath.resolve("processing"));
readyPath = createDir(spoolerPath.resolve("ready"));
failuresPath = createDir(spoolerPath.resolve("failures"));
successesPath = createDir(spoolerPath.resolve("successes"));
}
private static Path createDir(Path path) {
File file = path.toFile();
if (file.exists() && file.canRead() && file.canWrite()) {
log.log(Level.INFO, "Directory " + path + " already exists");
} else if (file.mkdirs()) {
log.log(Level.FINE, "Created " + path);
} else {
log.log(Level.WARNING, "Could not create " + path + ", please check permissions");
}
return path;
}
private static class TimestampCompare implements Comparator<File> {
public int compare(File a, File b) {
return (int) (a.lastModified() - b.lastModified());
}
}
}
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