////  LogHandler.cpp//  libraries/shared/src////  Created by Stephen Birarda on 2014-10-28.//  Migrated from Logging.cpp created on 6/11/13//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <qcoreapplication.h> #include <qdatetime.h>#include <qdebug.h>#include <qtimer.h> #include "LogHandler.h" LogHandler& LogHandler::getInstance() {    static LogHandler staticInstance;    return staticInstance;} LogHandler::LogHandler() :    _shouldOutputPID(false){    // setup our timer to flush the verbose logs every 5 seconds    QTimer* logFlushTimer = new QTimer(this);    connect(logFlushTimer, &QTimer::timeout, this, &LogHandler::flushRepeatedMessages);    logFlushTimer->start(VERBOSE_LOG_INTERVAL_SECONDS * 1000);        // when the log handler is first setup we should print our timezone    QString timezoneString = "Time zone: " + QDateTime::currentDateTime().toString("t");    printf("%s\n", qPrintable(timezoneString));} const char* stringForLogType(LogMsgType msgType) {    switch (msgType) {        case QtDebugMsg:            return "DEBUG";        case QtCriticalMsg:            return "CRITICAL";        case QtFatalMsg:            return "FATAL";        case QtWarningMsg:            return "WARNING";        case LogSuppressed:            return "SUPPRESS";        default:            return "UNKNOWN";    }} // the following will produce 11/18 13:55:36const QString DATE_STRING_FORMAT = "MM/dd hh:mm:ss"; void LogHandler::flushRepeatedMessages() {    QHash<QString, int>::iterator message = _repeatMessageCountHash.begin();    while (message != _repeatMessageCountHash.end()) {                if (message.value() > 0) {            QString repeatMessage = QString("%1 repeated log entries matching \"%2\" - Last entry: \"%3\"")            .arg(message.value()).arg(message.key()).arg(_lastRepeatedMessage.value(message.key()));                        QMessageLogContext emptyContext;            printMessage(LogSuppressed, emptyContext, repeatMessage);        }                _lastRepeatedMessage.remove(message.key());        message = _repeatMessageCountHash.erase(message);    }} QString LogHandler::printMessage(LogMsgType type, const QMessageLogContext& context, const QString& message) {        if (message.isEmpty()) {        return QString();    }        if (type == LogDebug) {        // for debug messages, check if this matches any of our regexes for repeated log messages        foreach(const QString& regexString, getInstance()._repeatedMessageRegexes) {            QRegExp repeatRegex(regexString);            if (repeatRegex.indexIn(message) != -1) {                                if (!_repeatMessageCountHash.contains(regexString)) {                    // we have a match but didn't have this yet - output the first one                    _repeatMessageCountHash[regexString] = 0;                                        // break the foreach so we output the first match                    break;                } else {                    // we have a match - add 1 to the count of repeats for this message and set this as the last repeated message                    _repeatMessageCountHash[regexString] += 1;                    _lastRepeatedMessage[regexString] = message;                                        // return out, we're not printing this one                    return QString();                }            }        }         // see if this message is one we should only print once        foreach(const QString& regexString, getInstance()._onlyOnceMessageRegexes) {            QRegExp onlyOnceRegex(regexString);            if (onlyOnceRegex.indexIn(message) != -1) {                if (!_onlyOnceMessageCountHash.contains(message)) {                    // we have a match and haven't yet printed this message.                    _onlyOnceMessageCountHash[message] = 1;                    // break the foreach so we output the first match                    break;                } else {                    // We've already printed this message, don't print it again.                    return QString();                }            }        }    }        // log prefix is in the following format    // [DEBUG] [TIMESTAMP] [PID] [TARGET] logged string        QString prefixString = QString("[%1]").arg(stringForLogType(type));        prefixString.append(QString(" [%1]").arg(QDateTime::currentDateTime().toString(DATE_STRING_FORMAT)));        if (_shouldOutputPID) {        prefixString.append(QString(" [%1]").arg(QCoreApplication::instance()->applicationPid()));            }        if (!_targetName.isEmpty()) {        prefixString.append(QString(" [%1]").arg(_targetName));    }        QString logMessage = QString("%1 %2").arg(prefixString, message);    fprintf(stdout, "%s\n", qPrintable(logMessage));    return logMessage;} void LogHandler::verboseMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString& message) {    getInstance().printMessage((LogMsgType) type, context, message);}