////  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>#include <QDebug>#include <QTimer>#include <QThread>#include <QMutexLocker>#include <QRegExp> #include "LogHandler.h" LogHandler& LogHandler::getInstance() {    static LogHandler staticInstance;    return staticInstance;} LogHandler::LogHandler() :    _shouldOutputProcessID(false),    _shouldOutputThreadID(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 LogDebug:            return "DEBUG";        case LogWarning:            return "WARNING";        case LogCritical:            return "CRITICAL";        case LogFatal:            return "FATAL";        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() {    QMutexLocker locker(&_repeatedMessageLock);    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        QMutexLocker locker(&_repeatedMessageLock);        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();                }            }        }    }    if (type == LogDebug) {        QMutexLocker locker(&_onlyOnceMessageLock);        // 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    // [TIMESTAMP] [DEBUG] [PID] [TID] [TARGET] logged string     QString prefixString = QString("[%1]").arg(QDateTime::currentDateTime().toString(DATE_STRING_FORMAT));     prefixString.append(QString(" [%1]").arg(stringForLogType(type)));     if (_shouldOutputProcessID) {        prefixString.append(QString(" [%1]").arg(QCoreApplication::instance()->applicationPid()));    }     if (_shouldOutputThreadID) {        size_t threadID = (size_t)QThread::currentThreadId();        prefixString.append(QString(" [%1]").arg(threadID));    }     if (!_targetName.isEmpty()) {        prefixString.append(QString(" [%1]").arg(_targetName));    }     QString logMessage = QString("%1 %2").arg(prefixString, message.split("\n").join("\n" + prefixString + " "));    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);} const QString& LogHandler::addRepeatedMessageRegex(const QString& regexString) {    QMutexLocker locker(&_repeatedMessageLock);    return *_repeatedMessageRegexes.insert(regexString);} const QString& LogHandler::addOnlyOnceMessageRegex(const QString& regexString) {    QMutexLocker locker(&_onlyOnceMessageLock);    return *_onlyOnceMessageRegexes.insert(regexString);}