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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.log;
import com.yahoo.text.Utf8;
import java.io.RandomAccessFile;
import java.io.FileOutputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Enumeration;
import java.util.TimerTask;
import java.util.logging.LogManager;
import java.util.logging.Logger;
import static java.nio.charset.StandardCharsets.US_ASCII;
/**
* @author Ulf Lilleengen
* @since 5.1
* Should only be used internally in the log library
*/
class VespaLevelControllerRepo implements LevelControllerRepo {
private RandomAccessFile ctlFile;
private FileOutputStream ctlFileAppender;
private MappedByteBuffer mapBuf;
private MappedLevelControllerRepo levelControllerRepo;
private final String logControlFilename;
private final String appPrefix;
private static final int maxPrefix = 64;
private static final String CFHEADER = "Vespa log control file version 1\n";
private static final String CFPREPRE = "Prefix: ";
/**
* length of fixed header content of a control file, constant:
**/
static final int controlFileHeaderLength;
/**
* number of distinctly controlled levels (in logctl files),
* must be compatible with C++ Vespa logging
**/
static final int numLevels = 8;
static {
controlFileHeaderLength = CFHEADER.length()
+ CFPREPRE.length()
+ 1 // newline
+ maxPrefix
+ 1; // newline
}
/**
* level controller for default levels (first-time logging
* or logging without a logcontrol file)
**/
private LevelController defaultLevelCtrl;
VespaLevelControllerRepo(String logCtlFn, String logLevel, String applicationPrefix) {
this.logControlFilename = logCtlFn;
this.appPrefix = applicationPrefix;
defaultLevelCtrl = new DefaultLevelController(logLevel);
openCtlFile();
}
private void resetCtlFile() {
// System.err.println("reset limit to: "+defaultLevelCtrl.getLevelLimit());
Logger.getLogger("").setLevel(defaultLevelCtrl.getLevelLimit());
try {
if (ctlFile != null) {
ctlFile.close();
}
} catch (java.io.IOException ign) {}
ctlFile = null;
try {
if (ctlFileAppender != null) {
ctlFileAppender.close();
}
} catch (java.io.IOException ign) {}
ctlFileAppender = null;
mapBuf = null;
levelControllerRepo = null;
}
private void openCtlFile() {
if (ctlFile != null) {
// already done this
return;
}
if (logControlFilename == null) {
// System.err.println("initialize limit to: "+defaultLevelCtrl.getLevelLimit());
Logger.getLogger("").setLevel(defaultLevelCtrl.getLevelLimit());
// only default level controller, very little can be done
return;
}
try {
ctlFile = new RandomAccessFile(logControlFilename, "rw");
ctlFileAppender = new FileOutputStream(logControlFilename, true);
ensureHeader();
extendMapping();
if (checkBackRunner == null) {
checkBackRunner = new CheckBackRunner();
LogSetup.getTaskRunner().schedule(checkBackRunner, 1000, 2999);
}
} catch (java.io.IOException e) {
System.err.println("problem opening logcontrol file "
+logControlFilename+": "+e);
resetCtlFile();
}
}
private void ensureHeader() throws java.io.IOException {
byte[] hbytes = Utf8.toBytes(CFHEADER);
byte[] rbytes = new byte[hbytes.length];
ctlFile.seek(0);
int l = ctlFile.read(rbytes);
if (l != hbytes.length
|| !java.util.Arrays.equals(hbytes, rbytes))
{
StringBuilder sb = new StringBuilder();
sb.append(CFHEADER);
sb.append(CFPREPRE);
int appLen = 0;
if (appPrefix != null) {
appLen = appPrefix.length();
sb.append(appPrefix);
}
sb.append('\n');
for (int i = appLen; i < maxPrefix + 2; i++) {
sb.append(' ');
}
sb.append('\n');
ctlFile.write(sb.toString().getBytes(US_ASCII));
ctlFile.setLength(ctlFile.getFilePointer());
if (ctlFile.getFilePointer() != (controlFileHeaderLength + 2)) {
System.err.println("internal error, bad header length: "
+ ctlFile.getFilePointer()
+ " (should have been: "
+ (controlFileHeaderLength + 2)
+ ")");
}
}
}
private void extendMapping() throws java.io.IOException {
if (ctlFile == null) return;
long pos = 0;
long len = ctlFile.length();
if (mapBuf == null || mapBuf.capacity() != len) {
mapBuf = ctlFile.getChannel().map(FileChannel.MapMode.READ_ONLY, pos, len);
}
levelControllerRepo = new MappedLevelControllerRepo(mapBuf, controlFileHeaderLength, numLevels, logControlFilename);
}
private LevelController getLevelControl(String suffix) {
LevelController ctrl = null;
if (levelControllerRepo != null) {
if (suffix == null || suffix.equals("default")) {
suffix = "";
}
ctrl = levelControllerRepo.getLevelController(suffix);
if (ctrl != null) {
return ctrl;
}
synchronized(this) {
if (ctlFile == null) {
return defaultLevelCtrl;
}
LevelController inherit;
int lastdot = suffix.lastIndexOf('.');
if (lastdot != -1) {
// inherit from level above
inherit = getLevelControl(suffix.substring(0, lastdot));
} else if (suffix.equals("")) {
// the one and only toplevel inherits from other mechanism
inherit = defaultLevelCtrl;
} else {
// everything else inherits from toplevel
inherit = getLevelControl("");
}
try {
long len = ctlFile.length();
StringBuilder sb = new StringBuilder();
if (suffix.equals("")) {
sb.append("default: ");
} else {
sb.append(".").append(suffix).append(": ");
}
while ((len + sb.length()) % 4 != 0) {
sb.append(" ");
}
sb.append(inherit.getOnOffString()).append("\n");
byte[] lineBytes = sb.toString().getBytes(US_ASCII);
ctlFileAppender.write(lineBytes);
ctlFileAppender.flush();
ctlFile.seek(ctlFile.length());
extendMapping();
ctrl = levelControllerRepo.getLevelController(suffix);
} catch(java.nio.channels.ClosedByInterruptException e) {
// happens during shutdown, ignore
// System.err.println("interrupt, reset logcontrol file: "+e);
resetCtlFile();
} catch(java.io.IOException e) {
System.err.println("error extending logcontrol file: "+e);
e.printStackTrace();
resetCtlFile();
}
}
}
if (ctrl == null) {
return defaultLevelCtrl;
} else {
return ctrl;
}
}
private void checkBack() {
if (levelControllerRepo != null) {
Enumeration<String> e = LogManager.getLogManager().getLoggerNames();
while (e.hasMoreElements()) {
String name = e.nextElement();
LevelController ctrl = getLevelControl(name);
ctrl.checkBack();
}
levelControllerRepo.checkBack();
}
}
@Override
public LevelController getLevelController(String component) {
return getLevelControl(component);
}
private class CheckBackRunner extends TimerTask {
public void run() {
checkBack();
}
}
private CheckBackRunner checkBackRunner;
@Override
public void close() {
if (checkBackRunner != null) {
checkBackRunner.cancel();
}
}
}
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