Code for loading <log method=file> tags from config, but this still needs to be fit into the config reader stuff

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@8885 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 90 insertions, 0 deletions

diff --git a/include/logger.h b/include/logger.h
index 8f030b53b..c4729035c 100644
--- a/include/logger.h
+++ b/include/logger.h
@@ -14,6 +14,65 @@
 #ifndef __LOGMANAGER_H
 #define __LOGMANAGER_H
 
+/** This class implements a nonblocking writer.
+ * Most people writing an ircd give little thought to their disk
+ * i/o. On a congested system, disk writes can block for long
+ * periods of time (e.g. if the system is busy and/or swapping
+ * a lot). If we just use a blocking fprintf() call, this could
+ * block for undesirable amounts of time (half of a second through
+ * to whole seconds). We DO NOT want this, so we make our logfile
+ * nonblocking and hook it into the SocketEngine.
+ * NB: If the operating system does not support nonblocking file
+ * I/O (linux seems to, as does freebsd) this will default to
+ * blocking behaviour.
+ */
+class CoreExport FileWriter : public EventHandler
+{
+ protected:
+	/** The creator/owner of this object
+	 */
+	InspIRCd* ServerInstance;
+	/** The log file (fd is inside this somewhere,
+	 * we get it out with fileno())
+	 */
+	FILE* log;
+	/** Buffer of pending log lines to be written
+	 */
+	std::string buffer;
+	/** Number of write operations that have occured
+	 */
+	int writeops;
+ public:
+	/** The constructor takes an already opened logfile.
+	 */
+	FileWriter(InspIRCd* Instance, FILE* logfile);
+	/** This returns false, logfiles are writeable.
+	 */
+	virtual bool Readable();
+	/** Handle pending write events.
+	 * This will flush any waiting data to disk.
+	 * If any data remains after the fprintf call,
+	 * another write event is scheduled to write
+	 * the rest of the data when possible.
+	 */
+	virtual void HandleEvent(EventType et, int errornum = 0);
+	/** Write one or more preformatted log lines.
+	 * If the data cannot be written immediately,
+	 * this class will insert itself into the
+	 * SocketEngine, and register a write event,
+	 * and when the write event occurs it will
+	 * attempt again to write the data.
+	 */
+	void WriteLogLine(const std::string &line);
+	/** Close the log file and cancel any events.
+	 */
+	virtual void Close();
+	/** Close the log file and cancel any events.
+	 * (indirectly call Close()
+	 */
+	virtual ~FileWriter();
+};
+
 class CoreExport LogStream : public classbase
 {
  protected:
@@ -25,9 +84,13 @@ class CoreExport LogStream : public classbase
 		this->ServerInstance = Instance;
 	}
 
+	virtual ~LogStream() { }
+
 	virtual void OnLog(int loglevel, const std::string &type, const std::string &msg) { }
 };
 
+typedef std::map<FileWriter*, int> FileLogMap;
+
 class CoreExport LogManager : public classbase
 {
  private:
@@ -35,6 +98,7 @@ class CoreExport LogManager : public classbase
 	InspIRCd *ServerInstance;
 	std::map<std::string, std::vector<LogStream *> > LogStreams;
 	std::vector<LogStream *> GlobalLogStreams; //holds all logstreams with a type of *
+	FileLogMap FileLogs; /* Holds all file logs, refcounted */
  public:
 	LogManager(InspIRCd *Instance)
 	{
@@ -42,6 +106,32 @@ class CoreExport LogManager : public classbase
 		Logging = false;
 	}
 
+	void AddLoggerRef(FileWriter* fw)
+	{
+		FileLogMap::iterator i = FileLogs.find(fw);
+		if (i == FileLogs.end())
+		{
+			FileLogs.insert(std::make_pair(fw, 1));
+		}
+		else
+		{
+			++i->second;
+		}
+	}
+
+	void DelLoggerRef(FileWriter* fw)
+	{
+		FileLogMap::iterator i = FileLogs.find(fw);
+		if (i == FileLogs.end()) return; /* Maybe should log this? */
+		if (--i->second < 1)
+		{
+			delete i->first;
+			FileLogs.erase(i);
+		}
+	}
+
+	void OpenSingleFile(FILE* f, const std::string& type, int loglevel);
+	void OpenFileLogs();
 	void CloseLogs();
 	bool AddLogType(const std::string &type, LogStream *l);
 	bool DelLogType(const std::string &type, LogStream *l);