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@ -2,172 +2,14 @@ |
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#include <QCoreApplication> |
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// 初始化 static 变量
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QMutex LogHandlerPrivate::logMutex; |
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QFile* LogHandlerPrivate::logFile = nullptr; |
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QTextStream* LogHandlerPrivate::logOut = nullptr; |
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LogHandlerPrivate::LogHandlerPrivate() |
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{ |
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auto localApplicationDirPath = QCoreApplication::applicationDirPath(); |
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logDir.setPath(localApplicationDirPath + "/log"); // TODO: 日志文件夹的路径,为 exe 所在目录下的 log 文件夹,可从配置文件读取
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QString logPath = logDir.absoluteFilePath("today.log"); // 获取日志的路径
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// ========获取日志文件创建的时间========
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// QFileInfo::created(): On most Unix systems, this function returns the time of the last status change.
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// 所以不能运行时使用这个函数检查创建时间,因为会在运行时变化,于是在程序启动时保存下日志文件的最后修改时间,
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logFileCreatedDate = QFileInfo(logPath).lastModified().date(); // 若日志文件不存在,返回nullptr
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// 打开日志文件,如果不是当天创建的,备份已有日志文件
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openAndBackupLogFile(); |
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// 十分钟检查一次日志文件创建时间
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renameLogFileTimer.setInterval(1000 * 10); // TODO: 可从配置文件读取
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renameLogFileTimer.start(); |
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QObject::connect(&renameLogFileTimer, &QTimer::timeout, [this] |
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{ |
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QMutexLocker locker(&LogHandlerPrivate::logMutex); |
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openAndBackupLogFile(); // 打开日志文件
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checkLogFiles(); // 检测当前日志文件大小
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autoDeleteLog(); // 自动删除30天前的日志
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}); |
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// 定时刷新日志输出到文件,尽快的能在日志文件里看到最新的日志
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flushLogFileTimer.setInterval(1000); // TODO: 可从配置文件读取
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flushLogFileTimer.start(); |
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QObject::connect(&flushLogFileTimer, &QTimer::timeout, [] |
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{ |
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// qDebug() << QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"); // 测试不停的写入内容到日志文件
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QMutexLocker locker(&LogHandlerPrivate::logMutex); |
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if (nullptr != logOut) |
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{ |
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logOut->flush(); |
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} |
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}); |
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} |
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LogHandlerPrivate::~LogHandlerPrivate() |
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{ |
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if (nullptr != logFile) |
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{ |
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logFile->flush(); |
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logFile->close(); |
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delete logOut; |
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delete logFile; |
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// 因为他们是 static 变量
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logOut = nullptr; |
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logFile = nullptr; |
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} |
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} |
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// 打开日志文件 log.txt,如果不是当天创建的,则使用创建日期把其重命名为 yyyy-MM-dd.log,并重新创建一个 log.txt
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void LogHandlerPrivate::openAndBackupLogFile() |
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{ |
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// 总体逻辑:
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// 1. 程序启动时 logFile 为 nullptr,初始化 logFile,有可能是同一天打开已经存在的 logFile,所以使用 Append 模式
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// 2. logFileCreatedDate is nullptr, 说明日志文件在程序开始时不存在,所以记录下创建时间
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// 3. 程序运行时检查如果 logFile 的创建日期和当前日期不相等,则使用它的创建日期重命名,然后再生成一个新的 log.txt 文件
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// 4. 检查日志文件超过 LOGLIMIT_NUM 个,删除最早的
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// 备注:log.txt 始终为当天的日志文件,当第二天,会执行第3步,将使用 log.txt 的创建日期重命名它
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// 如果日志所在目录不存在,则创建
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if (!logDir.exists()) |
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{ |
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logDir.mkpath("."); // 可以递归的创建文件夹
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} |
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QString logPath = logDir.absoluteFilePath("today.log"); // log.txt的路径
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// [[1]] 程序每次启动时 logFile 为 nullptr
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if (logFile == nullptr) |
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{ |
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logFile = new QFile(logPath); |
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logOut = (logFile->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append)) ? new QTextStream(logFile) : nullptr; |
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if (logOut != nullptr) |
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logOut->setCodec("UTF-8"); |
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// [[2]] 如果文件是第一次创建,则创建日期是无效的,把其设置为当前日期
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if (logFileCreatedDate.isNull()) |
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{ |
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logFileCreatedDate = QDate::currentDate(); |
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} |
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} |
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// [[3]] 程序运行时如果创建日期不是当前日期,则使用创建日期重命名,并生成一个新的 log.txt
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if (logFileCreatedDate != QDate::currentDate()) |
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{ |
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logFile->flush(); |
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logFile->close(); |
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delete logOut; |
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delete logFile; |
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QString newLogPath = logDir.absoluteFilePath(logFileCreatedDate.toString("yyyy-MM-dd.log"));; |
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QFile::copy(logPath, newLogPath); // Bug: 按理说 rename 会更合适,但是 rename 时最后一个文件总是显示不出来,需要 killall Finder 后才出现
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QFile::remove(logPath); // 删除重新创建,改变创建时间
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// 重新创建 log.txt
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logFile = new QFile(logPath); |
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logOut = (logFile->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate)) ? new QTextStream(logFile) : nullptr; |
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logFileCreatedDate = QDate::currentDate(); |
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if (logOut != nullptr) |
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logOut->setCodec("UTF-8"); |
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} |
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} |
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// 检测当前日志文件大小
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void LogHandlerPrivate::checkLogFiles() |
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{ |
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// 如果 protocal.log 文件大小超过5M,重新创建一个日志文件,原文件存档为yyyy-MM-dd_hhmmss.log
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if (logFile->size() > 1024 * g_logLimitSize) |
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{ |
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logFile->flush(); |
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logFile->close(); |
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delete logOut; |
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delete logFile; |
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QString logPath = logDir.absoluteFilePath("today.log"); // 日志的路径
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QString newLogPath = logDir.absoluteFilePath(logFileCreatedDate.toString("yyyy-MM-dd.log")); |
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QFile::copy(logPath, newLogPath); // Bug: 按理说 rename 会更合适,但是 rename 时最后一个文件总是显示不出来,需要 killall Finder 后才出现
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QFile::remove(logPath); // 删除重新创建,改变创建时间
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logFile = new QFile(logPath); |
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logOut = (logFile->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate)) ? new QTextStream(logFile) : NULL; |
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logFileCreatedDate = QDate::currentDate(); |
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if (logOut != nullptr) |
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logOut->setCodec("UTF-8"); |
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} |
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} |
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// 自动删除30天前的日志
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void LogHandlerPrivate::autoDeleteLog() |
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{ |
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QDateTime now = QDateTime::currentDateTime(); |
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// 前30天
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QDateTime dateTime1 = now.addDays(-30); |
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QDateTime dateTime2; |
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QString logPath = logDir.absoluteFilePath("today.log"); // 日志的路径
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QDir dir(logPath); |
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QFileInfoList fileList = dir.entryInfoList(); |
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foreach (QFileInfo f, fileList ) |
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{ |
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// "."和".."跳过
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if (f.baseName() == "" || f.baseName() == "today" || f.baseName() == "today.log") |
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continue; |
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dateTime2 = QDateTime::fromString(f.baseName(), "yyyy-MM-dd"); |
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if (dateTime2 < dateTime1) // 只要日志时间小于前30天的时间就删除
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{ |
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dir.remove(f.absoluteFilePath()); |
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} |
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} |
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} |
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QMutex g_mutex; |
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//QTextStream *g_in = nullptr;
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QFile g_file; |
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// 消息处理函数
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void LogHandlerPrivate::messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg) |
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void messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg) |
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{ |
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QMutexLocker locker(&LogHandlerPrivate::logMutex); |
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g_mutex.lock(); |
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QString level; |
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switch (type) |
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@ -198,15 +40,6 @@ void LogHandlerPrivate::messageHandler(QtMsgType type, const QMessageLogContext |
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QByteArray localMsg = msg.toLocal8Bit(); |
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#endif |
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// std::cout << std::string(localMsg) << std::endl;
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// qSetMessagePattern("%{appname} %{type} %{time [yyyy-MM-dd hh:mm:ss]} %{file} %{line} %{function} %{message}");
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if (nullptr == LogHandlerPrivate::logOut) |
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{ |
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return; |
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} |
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// 输出到日志文件, 格式: 时间 - [Level] (文件名:行数, 函数): 消息
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QString fileName = context.file; |
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int index = fileName.lastIndexOf(QDir::separator()); |
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@ -215,31 +48,43 @@ void LogHandlerPrivate::messageHandler(QtMsgType type, const QMessageLogContext |
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.arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")).arg(level) |
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.arg(fileName).arg(context.line).arg(context.function).arg(msg); |
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std::cout << msgOut.toLocal8Bit().constData() << std::endl; |
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(*LogHandlerPrivate::logOut) << msgOut << "\n"; |
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} |
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LogHandler::LogHandler() : d(nullptr) |
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{ |
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QTextStream in(&g_file); |
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in << msgOut << "\n"; |
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// g_file.flush();
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g_mutex.unlock(); |
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} |
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// 给Qt安装消息处理函数
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void LogHandler::installMessageHandler() |
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{ |
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QMutexLocker locker(&LogHandlerPrivate::logMutex); // 类似C++11的lock_guard,析构时自动解锁
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if (nullptr == d) |
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//获取日期
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auto _currentDate = QDateTime::currentDateTime().toString("yyyy-MM-dd"); |
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//打开/创建文件
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auto _appDirPath = QCoreApplication::applicationDirPath(); |
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auto _logDirPath = _appDirPath + "/logs/"; |
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QDir _logDir(_logDirPath); |
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if(!_logDir.exists()) |
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_logDir.mkpath(_logDirPath); |
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auto _logPath = _logDirPath + _currentDate + ".log"; |
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g_file.setFileName(_logPath); |
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if(!g_file.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append)) |
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{ |
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d = new LogHandlerPrivate(); |
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qInstallMessageHandler(LogHandlerPrivate::messageHandler); // 给 Qt 安装自定义消息处理函数
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return; |
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} |
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// g_in = new QTextStream(&g_file);
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qInstallMessageHandler(messageHandler); // 给 Qt 安装自定义消息处理函数
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} |
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// 取消安装消息处理函数并释放资源
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void LogHandler::uninstallMessageHandler() |
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{ |
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QMutexLocker locker(&LogHandlerPrivate::logMutex); |
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g_mutex.lock(); |
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if(g_file.isOpen()) |
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{ |
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g_file.flush(); |
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g_file.close(); |
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} |
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g_mutex.unlock(); |
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qInstallMessageHandler(nullptr); |
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delete d; |
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d = nullptr; |
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} |
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