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products/sources/formale Sprachen/Java/Tomcat/java/org/apache/tomcat/util/log/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 10.10.2023 mit Größe 4 kB

Quelle UserDataHelper.java Sprache: JAVA

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.log;

import org.apache.juli.logging.Log;

/**
* This helper class assists with the logging associated with invalid input
* data. A developer may want all instances of invalid input data logged to
* assist with debugging whereas in production it is likely to be desirable not
* to log anything for invalid data. The following settings may be used:
* <ul>
* <li>NOTHING: Log nothing.</li>
* <li>DEBUG_ALL: Log all problems at DEBUG log level.</li>
* <li>INFO_THEN_DEBUG: Log first problem at INFO log level and any further
*     issues in the following TBD (configurable) seconds at DEBUG level</li>
* <li>INFO_ALL: Log all problems at INFO log level.</li>
* </ul>
* By default, INFO_THEN_DEBUG is used with a suppression time of 24 hours.
*
* NOTE: This class is not completely thread-safe. When using INFO_THEN_DEBUG it
* is possible that several INFO messages will be logged before dropping to
* DEBUG.
*/
public class UserDataHelper {

    private final Log log;

    private final Config config;

    // A value of 0 is equivalent to using INFO_ALL
    // A negative value will trigger infinite suppression
    // The value is milliseconds
    private final long suppressionTime;

    private volatile long lastInfoTime = 0;

    public UserDataHelper(Log log) {
        this.log = log;

        Config tempConfig;
        String configString = System.getProperty(
                "org.apache.juli.logging.UserDataHelper.CONFIG");
        if (configString == null) {
            tempConfig = Config.INFO_THEN_DEBUG;
        } else {
            try {
                tempConfig = Config.valueOf(configString);
            } catch (IllegalArgumentException iae) {
                // Ignore - use default
                tempConfig = Config.INFO_THEN_DEBUG;
            }
        }

        // Default suppression time of 1 day.
        suppressionTime = Integer.getInteger(
                "org.apache.juli.logging.UserDataHelper.SUPPRESSION_TIME",
                60 * 60 * 24).intValue() * 1000L;

        if (suppressionTime == 0) {
            tempConfig = Config.INFO_ALL;
        }

        config = tempConfig;
    }

    /**
     * Returns log mode for the next log message, or <code>null</code> if the
     * message should not be logged.
     *
     * <p>
     * If <code>INFO_THEN_DEBUG</code> configuration option is enabled, this
     * method might change internal state of this object.
     *
     * @return Log mode, or <code>null</code>
     */
    public Mode getNextMode() {
        if (Config.NONE == config) {
            return null;
        } else if (Config.DEBUG_ALL == config) {
            return log.isDebugEnabled() ? Mode.DEBUG : null;
        } else if (Config.INFO_THEN_DEBUG == config) {
            if (logAtInfo()) {
                return log.isInfoEnabled() ? Mode.INFO_THEN_DEBUG : null;
            } else {
                return log.isDebugEnabled() ? Mode.DEBUG : null;
            }
        } else if (Config.INFO_ALL == config) {
            return log.isInfoEnabled() ? Mode.INFO : null;
        }
        // Should never happen
        return null;
    }

    /*
     * Not completely thread-safe but good enough for this use case. I couldn't
     * see a simple enough way to make it completely thread-safe that was not
     * likely to compromise performance.
     */
    private boolean logAtInfo() {

        if (suppressionTime < 0 && lastInfoTime > 0) {
            return false;
        }

        long now = System.currentTimeMillis();

        if (lastInfoTime + suppressionTime > now) {
            return false;
        }

        lastInfoTime = now;
        return true;
    }

    private enum Config {
        NONE,
        DEBUG_ALL,
        INFO_THEN_DEBUG,
        INFO_ALL
    }

    /**
     * Log mode for the next log message.
     */
    public enum Mode {
        DEBUG,
        INFO_THEN_DEBUG,
        INFO
    }
}

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