119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
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#include "TraceFile.hpp"
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#include <stdexcept>
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#include <QDebug>
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#include <QString>
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#include <QFile>
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#include <QTextStream>
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#include <QMessageLogContext>
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#include <QDateTime>
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#include <QMutex>
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#include <QMutexLocker>
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#include "pimpl_impl.hpp"
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namespace
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{
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QMutex lock;
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}
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class TraceFile::impl
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{
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public:
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impl (QString const& trace_file_path);
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~impl ();
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// no copying
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impl (impl const&) = delete;
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impl& operator = (impl const&) = delete;
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private:
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// write Qt messages to the diagnostic log file
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static void message_handler (QtMsgType type, QMessageLogContext const& context, QString const& msg);
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QFile file_;
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QTextStream stream_;
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QTextStream * original_stream_;
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QtMessageHandler original_handler_;
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static QTextStream * current_stream_;
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};
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QTextStream * TraceFile::impl::current_stream_;
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// delegate to implementation class
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TraceFile::TraceFile (QString const& trace_file_path)
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: m_ {trace_file_path}
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{
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}
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TraceFile::~TraceFile ()
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{
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}
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TraceFile::impl::impl (QString const& trace_file_path)
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: file_ {trace_file_path}
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, original_stream_ {current_stream_}
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, original_handler_ {nullptr}
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{
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// if the log file is writeable; initialise diagnostic logging to it
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// for append and hook up the Qt global message handler
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if (file_.open (QFile::WriteOnly | QFile::Append | QFile::Text))
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{
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stream_.setDevice (&file_);
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current_stream_ = &stream_;
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original_handler_ = qInstallMessageHandler (message_handler);
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}
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}
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TraceFile::impl::~impl ()
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{
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// unhook our message handler before the stream and file are destroyed
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if (original_handler_)
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{
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qInstallMessageHandler (original_handler_);
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}
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current_stream_ = original_stream_; // revert to prior stream
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}
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// write Qt messages to the diagnostic log file
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void TraceFile::impl::message_handler (QtMsgType type, QMessageLogContext const& context, QString const& msg)
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{
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char const * severity;
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switch (type)
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{
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case QtDebugMsg:
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severity = "Debug";
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break;
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case QtWarningMsg:
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severity = "Warning";
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break;
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case QtFatalMsg:
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severity = "Fatal";
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break;
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default:
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severity = "Critical";
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break;
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}
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{
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// guard against multiple threads with overlapping messages
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QMutexLocker guard (&lock);
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Q_ASSERT_X (current_stream_, "TraceFile:message_handler", "no stream to write to");
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*current_stream_
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<< QDateTime::currentDateTimeUtc ().toString ("yyyy-MM-ddTHH:mm:ss.zzzZ")
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<< '(' << context.file << ':' << context.line /* << ", " << context.function */ << ')'
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<< severity << ": " << msg.trimmed () << endl;
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}
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if (QtFatalMsg == type)
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{
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throw std::runtime_error {"Fatal Qt Error"};
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}
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}
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