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Hyperledger Fabric Java Chaincode Shim
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/*
Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.LogManager;

/**
 * Assistance class to use when logging.
 * 
 * For chaincode/contract implementations please use java.util.logging or your
 * own framework. All the Hyperledger Fabric code here is logged in loggers with
 * names starting org.hyperledger
 *
 * Control of this is via the environment variables
 * 'CORE_CHAINCODE_LOGGING_LEVEL' this takes a string that matches the following
 * Java.util.logging levels (case insensitive)
 * 
 * CRITICAL, ERROR == Level.SEVERE, WARNING == Level.WARNING, INFO == Level.INFO
 * NOTICE == Level.CONFIG, DEBUG == Level.FINEST
 * 
 */
public class Logging {

    public static final String PERFLOGGER = "org.hyperledger.Performance";

    /**
     * Formats a Throwable to a string with details of all the causes as well
     * 
     * @param throwable Exception
     * @return String formatted with all the details
     */
    public static String formatError(final Throwable throwable) {
        if (throwable == null) {
            return null;
        }
        final StringWriter buffer = new StringWriter();
        buffer.append(throwable.getMessage()).append(System.lineSeparator());
        
        throwable.printStackTrace(new PrintWriter(buffer));

        final Throwable cause = throwable.getCause();
        if (cause != null) {
            buffer.append(".. caused by ..").append(System.lineSeparator());
            buffer.append(Logging.formatError(cause));
        }

        return buffer.toString();

    }

    /**
     * Sets the log level to the the
     * @param newLevel  the new logging level 
     */
    public static void setLogLevel(String newLevel) {

        Level l = mapLevel(newLevel);
        LogManager logManager = LogManager.getLogManager();
        // slightly cumbersome approach - but the loggers don't have a 'get children'
        // so find those that have the correct stem.
        final ArrayList allLoggers = Collections.list(logManager.getLoggerNames());
        allLoggers.add("org.hyperledger");
        allLoggers.stream().filter(name -> name.startsWith("org.hyperledger")).map(name -> logManager.getLogger(name))
                .forEach(logger -> {
                    if (logger != null) {
                        logger.setLevel(l);
                    }
                });
    }

    private static Level mapLevel(final String level) {
        if (level != null) {
            switch (level.toUpperCase().trim()) {
            case "ERROR":
            case "CRITICAL":
                return Level.SEVERE;
            case "WARNING":
                return Level.WARNING;
            case "INFO":
                return Level.INFO;
            case "NOTICE":
                return Level.CONFIG;
            case "DEBUG":
                return Level.FINEST;
            }
        }
        return Level.INFO;
    }
}