org.elasticsearch.common.logging.DeprecationLogger Maven / Gradle / Ivy
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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common.logging;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.List;
/**
* A logger that logs deprecation notices. Logger should be initialized with a class or name which will be used
* for deprecation logger. For instance DeprecationLogger.getLogger("org.elasticsearch.test.SomeClass") will
* result in a deprecation logger with name org.elasticsearch.deprecation.test.SomeClass. This allows to use a
* deprecation logger defined in log4j2.properties.
*
* Logs are emitted at the custom {@link #CRITICAL} level, and routed wherever they need to go using log4j. For example,
* to disk using a rolling file appender, or added as a response header using {@link HeaderWarningAppender}.
*
* Deprecation messages include a key, which is used for rate-limiting purposes. The log4j configuration
* uses {@link RateLimitingFilter} to prevent the same message being logged repeatedly in a short span of time. This
* key is combined with the X-Opaque-Id request header value, if supplied, which allows for per-client
* message limiting.
*/
public class DeprecationLogger {
/**
* Deprecation messages are logged at this level.
* More serious than WARN by 1, but less serious than ERROR
*/
public static Level CRITICAL = Level.forName("CRITICAL", Level.WARN.intLevel() - 1);
private static volatile List skipTheseDeprecations = Collections.emptyList();
private final Logger logger;
/**
* Creates a new deprecation logger for the supplied class. Internally, it delegates to
* {@link #getLogger(String)}, passing the full class name.
*/
public static DeprecationLogger getLogger(Class aClass) {
return getLogger(toLoggerName(aClass));
}
/**
* Creates a new deprecation logger based on the parent logger. Automatically
* prefixes the logger name with "deprecation", if it starts with "org.elasticsearch.",
* it replaces "org.elasticsearch" with "org.elasticsearch.deprecation" to maintain
* the "org.elasticsearch" namespace.
*/
public static DeprecationLogger getLogger(String name) {
return new DeprecationLogger(name);
}
/**
* The DeprecationLogger uses the "deprecation.skip_deprecated_settings" setting to decide whether to log a deprecation for a setting.
* This is a node setting. This method initializes the DeprecationLogger class with the node settings for the node in order to read the
* "deprecation.skip_deprecated_settings" setting. This only needs to be called once per JVM. If it is not called, the default behavior
* is to assume that the "deprecation.skip_deprecated_settings" setting is not set.
* @param nodeSettings The settings for this node
*/
public static void initialize(Settings nodeSettings) {
skipTheseDeprecations = nodeSettings == null
? Collections.emptyList()
: nodeSettings.getAsList("deprecation.skip_deprecated_settings");
}
private DeprecationLogger(String parentLoggerName) {
this.logger = LogManager.getLogger(getLoggerName(parentLoggerName));
}
private static String getLoggerName(String name) {
if (name.startsWith("org.elasticsearch")) {
name = name.replace("org.elasticsearch.", "org.elasticsearch.deprecation.");
} else {
name = "deprecation." + name;
}
return name;
}
private static String toLoggerName(final Class cls) {
String canonicalName = cls.getCanonicalName();
return canonicalName != null ? canonicalName : cls.getName();
}
/**
* Logs a message at the {@link DeprecationLogger#CRITICAL} level.
* This log will indicate that a change will break in next version.
* The message is also sent to the header warning logger,
* so that it can be returned to the client.
*/
public DeprecationLogger critical(final DeprecationCategory category, final String key, final String msg, final Object... params) {
return logDeprecation(CRITICAL, category, key, msg, params);
}
/**
* Logs a message at the {@link Level#WARN} level for less critical deprecations
* that won't break in next version.
* The message is also sent to the header warning logger,
* so that it can be returned to the client.
*/
public DeprecationLogger warn(final DeprecationCategory category, final String key, final String msg, final Object... params) {
return logDeprecation(Level.WARN, category, key, msg, params);
}
private DeprecationLogger logDeprecation(Level level, DeprecationCategory category, String key, String msg, Object[] params) {
if (Regex.simpleMatch(skipTheseDeprecations, key) == false) {
String opaqueId = HeaderWarning.getXOpaqueId();
String productOrigin = HeaderWarning.getProductOrigin();
ESLogMessage deprecationMessage = new DeprecatedMessage(category, key, opaqueId, productOrigin, msg, params);
doPrivilegedLog(level, deprecationMessage);
}
return this;
}
private void doPrivilegedLog(Level level, ESLogMessage deprecationMessage) {
AccessController.doPrivileged((PrivilegedAction) () -> {
logger.log(level, deprecationMessage);
return null;
});
}
}