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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.log;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.nio.file.StandardOpenOption.*;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import static com.yahoo.vespa.defaults.Defaults.getDefaults;
/**
* @author arnej
*
* This class takes care of saving meta-data about a log-file,
* ensuring that we can enact policies about log retention.
**/
public class LogFileDb {
static final String DBDIR = "var/db/vespa/logfiledb/";
private static long dayStamp() {
long s = System.currentTimeMillis() / 1000;
return s / 100000;
}
private static OutputStream metaFile() throws java.io.IOException {
String fn = getDefaults().underVespaHome(DBDIR + "logfiles." + dayStamp());
Path path = Paths.get(fn);
return Files.newOutputStream(path, CREATE, APPEND);
}
public static void nowLoggingTo(String filename) {
if (filename.contains("\n")) {
throw new IllegalArgumentException("Cannot use filename with newline: "+filename);
}
long s = System.currentTimeMillis() / 1000;
String meta = "" + s + " " + filename + "\n";
byte[] data = meta.getBytes(UTF_8);
try (OutputStream out = metaFile()) {
out.write(data);
} catch (java.io.IOException e) {
System.err.println("Saving meta-data about logfile "+filename+" failed: "+e);
// ignore
}
}
}
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