Use a circular buffer to store only the last 250 log messages

aegisub/libaegisub/common/log.cpp

@@ -30,7 +30,6 @@
 #include <boost/filesystem/fstream.hpp>
 #include <boost/range/algorithm.hpp>
 #include <cstring>
-#include <fstream>
 #include <functional>
 
 namespace agi {
@@ -43,30 +42,17 @@ LogSink *log;
 /// Keep this ordered the same as Severity
 const char *Severity_ID = "EAWID";
 
-SinkMessage::SinkMessage(const char *section, Severity severity, const char *file, const char *func, int line, timeval tv)
-: section(section)
-, severity(severity)
-, file(file)
-, func(func)
-, line(line)
-, tv(tv)
-{
-}
-
-/// @todo The log files need to be trimmed after N amount.
 LogSink::~LogSink() {
 	// The destructor for emitters may try to log messages, so disable all the
 	// emitters before destructing any
 	std::vector<Emitter*> emitters_temp;
 	swap(emitters_temp, emitters);
 	util::delete_clear(emitters_temp);
-
-	util::delete_clear(sink);
 }
 
-void LogSink::log(SinkMessage *sm) {
-	sink.push_back(sm);
-	boost::for_each(emitters, [=](Emitter *em) { em->log(sm); });
+void LogSink::Log(SinkMessage const& sm) {
+	messages.push_back(sm);
+	boost::for_each(emitters, [=](Emitter *em) { em->log(&messages.back()); });
 }
 
 void LogSink::Subscribe(Emitter *em) {
@@ -83,12 +69,17 @@ void LogSink::Unsubscribe(Emitter *em) {
 Message::Message(const char *section, Severity severity, const char *file, const char *func, int line)
 : msg(nullptr, 1024)
 {
-	sm = new SinkMessage(section, severity, file, func, line, util::time_log());
+	sm.section = section;
+	sm.severity = severity;
+	sm.file = file;
+	sm.func = func;
+	sm.line = line;
+	sm.tv = util::time_log();
 }
 
 Message::~Message() {
-	sm->message = std::string(msg.str(), (std::string::size_type)msg.pcount());
-	agi::log::log->log(sm);
+	sm.message = std::string(msg.str(), (std::string::size_type)msg.pcount());
+	agi::log::log->Log(sm);
 	msg.freeze(false);
 }
 

aegisub/libaegisub/include/libaegisub/log.h

@@ -20,7 +20,7 @@
 #include <libaegisub/time.h>
 
 #include <ctime>
-#include <deque>
+#include <boost/circular_buffer.hpp>
 #include <iosfwd>
 #include <memory>
 #include <vector>
@@ -68,15 +68,6 @@ extern LogSink *log;
 
 /// Container to hold a single message
 struct SinkMessage {
-	/// @brief Constructor
-	/// @param section  Section info
-	/// @param severity Severity
-	/// @param file     File name
-	/// @param func     Function name
-	/// @param line     Source line
-	/// @param tv       Log time
-	SinkMessage(const char *section, Severity severity, const char *file, const char *func, int line, timeval tv);
-
 	const char *section;	///< Section info eg "video/open" "video/seek" etc
 	Severity severity;		///< Severity
 	const char *file;		///< Source file
@@ -88,23 +79,19 @@ struct SinkMessage {
 
 class Emitter;
 
-/// Message sink for holding all messages
-typedef std::deque<SinkMessage*> Sink;
-
 /// Log sink, single destination for all messages
 class LogSink {
-	/// Log sink
-	Sink sink;
+	boost::circular_buffer<SinkMessage> messages;
 
 	/// List of pointers to emitters
 	std::vector<Emitter*> emitters;
 
 public:
-	/// Destructor
+	LogSink() : messages(250) { }
 	~LogSink();
 
 	/// Insert a message into the sink.
-	void log(SinkMessage *sm);
+	void Log(SinkMessage const& sm);
 
 	/// @brief Subscribe an emitter
 	/// @param em Emitter to add
@@ -118,7 +105,7 @@ public:
 
 	/// @brief @get the complete (current) log.
 	/// @return Const pointer to internal sink.
-	const Sink* GetSink() const { return &sink; }
+	decltype(messages) const& GetSink() const { return messages; }
 };
 
 /// An emitter to produce human readable output for a log sink.
@@ -150,7 +137,7 @@ public:
 /// Generates a message and submits it to the log sink.
 class Message {
 	std::ostrstream msg;
-	SinkMessage *sm;
+	SinkMessage sm;
 
 public:
 	Message(const char *section, Severity severity, const char *file, const char *func, int line);

aegisub/src/dialog_log.cpp

@@ -57,15 +57,15 @@ public:
 	EmitLog(wxTextCtrl *t)
 	: text_ctrl(t)
 	{
-		const agi::log::Sink *sink = agi::log::log->GetSink();
-		for_each(sink->begin(), sink->end(), std::bind(&EmitLog::log, this, std::placeholders::_1));
+		for (auto sm : agi::log::log->GetSink())
+			log(&sm);
 	}
 
 	void log(agi::log::SinkMessage *sm) {
 #ifndef _WIN32
 		tm tmtime;
 		localtime_r(&sm->tv.tv_sec, &tmtime);
-		wxString log = wxString::Format("%c %02d:%02d:%02d %-6ld <%-25s> [%s:%s:%d]  %s\n",
+		auto log = wxString::Format("%c %02d:%02d:%02d %-6ld <%-25s> [%s:%s:%d]  %s\n",
 			agi::log::Severity_ID[sm->severity],
 			(int)tmtime.tm_hour,
 			(int)tmtime.tm_min,
@@ -77,7 +77,7 @@ public:
 			sm->line,
 			to_wx(sm->message));
 #else
-		wxString log = wxString::Format("%c %-6ld <%-25s> [%s:%s:%d]  %s\n",
+		auto log = wxString::Format("%c %-6ld <%-25s> [%s:%s:%d]  %s\n",
 			agi::log::Severity_ID[sm->severity],
 			sm->tv.tv_usec,
 			sm->section,