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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler;
import com.yahoo.vespa.defaults.Defaults;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UncheckedIOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Comparator.comparing;
/**
* @author olaaun
* @author freva
* @author jonmv
*/
class LogReader {
private final Path logDirectory;
private final Pattern logFilePattern;
LogReader(String logDirectory, String logFilePattern) {
this(Paths.get(Defaults.getDefaults().underVespaHome(logDirectory)), Pattern.compile(logFilePattern));
}
LogReader(Path logDirectory, Pattern logFilePattern) {
this.logDirectory = logDirectory;
this.logFilePattern = logFilePattern;
}
void writeLogs(OutputStream outputStream, Instant from, Instant to) {
try {
List<Path> logs = getMatchingFiles(from, to);
for (int i = 0; i < logs.size(); i++) {
Path log = logs.get(i);
boolean zipped = log.toString().endsWith(".gz");
try (InputStream in = Files.newInputStream(log)) {
InputStream inProxy;
// If the log needs filtering, possibly unzip (and rezip) it, and filter its lines on timestamp.
if (i == 0 || i == logs.size() - 1) {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(zipped ? new GZIPInputStream(in) : in, UTF_8));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(zipped ? new GZIPOutputStream(buffer) : buffer, UTF_8))) {
for (String line; (line = reader.readLine()) != null; ) {
String[] parts = line.split("\t");
if (parts.length != 7)
continue;
Instant at = Instant.EPOCH.plus((long) (Double.parseDouble(parts[0]) * 1_000_000), ChronoUnit.MICROS);
if (at.isAfter(from) && ! at.isAfter(to)) {
writer.write(line);
writer.newLine();
}
}
}
inProxy = new ByteArrayInputStream(buffer.toByteArray());
}
else
inProxy = in;
// At the point when logs switch to un-zipped, replace the output stream with a zipping proxy.
if ( ! zipped && ! (outputStream instanceof GZIPOutputStream))
outputStream = new GZIPOutputStream(outputStream);
inProxy.transferTo(outputStream);
}
}
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
finally {
try {
outputStream.close();
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}
/** Returns log files which may have relevant entries, sorted by modification time — the first and last must be filtered. */
private List<Path> getMatchingFiles(Instant from, Instant to) {
Map<Path, Instant> paths = new HashMap<>();
try {
Files.walkFileTree(logDirectory, new SimpleFileVisitor<>() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
if (logFilePattern.matcher(file.getFileName().toString()).matches())
paths.put(file, attrs.lastModifiedTime().toInstant());
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
return FileVisitResult.CONTINUE;
}
});
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
List<Path> sorted = new ArrayList<>();
for (var entries = paths.entrySet().stream().sorted(comparing(Map.Entry::getValue)).iterator(); entries.hasNext(); ) {
var entry = entries.next();
if (entry.getValue().isAfter(from))
sorted.add(entry.getKey());
if (entry.getValue().isAfter(to))
break;
}
return sorted;
}
}
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