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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2010 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#ifndef LOGGER_H
#define LOGGER_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
{
protected:
/** The log file (fd is inside this somewhere,
* we get it out with fileno())
*/
FILE* log;
/** Number of write operations that have occured
*/
int writeops;
public:
/** The constructor takes an already opened logfile.
*/
FileWriter(FILE* logfile);
/** 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 ~FileWriter();
};
/*
* New world logging!
* The brief summary:
* Logging used to be a simple affair, a FILE * handled by a nonblocking logging class inheriting from EventHandler, that was inserted
* into the socket engine, and wrote lines. If nofork was on, it was printf()'d.
*
* We decided to horribly overcomplicate matters, and create vastly customisable logging. LogManager and LogStream form the visible basis
* of the new interface. Basically, a LogStream can be inherited to do different things with logging output. We inherit from it once in core
* to create a FileLogStream, that writes to a file, for example. Different LogStreams can hook different types of log messages, and different
* levels of output too, for extreme customisation. Multiple LogStreams can hook the same message/levels of output, meaning that e.g. output
* can go to a channel as well as a file.
*
* HOW THIS WORKS
* LogManager handles all instances of LogStreams, classes derived from LogStream are instantiated and passed to it.
*/
/** LogStream base class. Modules (and other stuff) inherit from this to decide what logging they are interested in, and what to do with it.
*/
class CoreExport LogStream : public classbase
{
protected:
int loglvl;
public:
LogStream(int loglevel) : loglvl(loglevel)
{
}
/* A LogStream's destructor should do whatever it needs to close any resources it was using (or indicate that it is no longer using a resource
* in the event that the resource is shared, see for example FileLogStream).
*/
virtual ~LogStream() { }
/** Changes the loglevel for this LogStream on-the-fly.
* This is needed for -nofork. But other LogStreams could use it to change loglevels.
*/
void ChangeLevel(int lvl) { this->loglvl = lvl; }
/** Called when there is stuff to log for this particular logstream. The derived class may take no action with it, or do what it
* wants with the output, basically. loglevel and type are primarily for informational purposes (the level and type of the event triggered)
* and msg is, of course, the actual message to log.
*/
virtual void OnLog(int loglevel, const std::string &type, const std::string &msg) = 0;
};
typedef std::map<FileWriter*, int> FileLogMap;
class CoreExport LogManager
{
private:
/** Lock variable, set to true when a log is in progress, which prevents further loggging from happening and creating a loop.
*/
bool Logging;
/** Map of active log types and what LogStreams will receive them.
*/
std::map<std::string, std::vector<LogStream *> > LogStreams;
/** Refcount map of all LogStreams managed by LogManager.
* If a logstream is not listed here, it won't be automatically closed by LogManager, even if it's loaded in one of the other lists.
*/
std::map<LogStream *, int> AllLogStreams;
/** LogStreams with type * (which means everything), and a list a logtypes they are excluded from (eg for "* -USERINPUT -USEROUTPUT").
*/
std::map<LogStream *, std::vector<std::string> > GlobalLogStreams;
/** Refcounted map of all FileWriters in use by FileLogStreams, for file stream sharing.
*/
FileLogMap FileLogs;
public:
LogManager();
~LogManager();
/** Adds a FileWriter instance to LogManager, or increments the reference count of an existing instance.
* Used for file-stream sharing for FileLogStreams.
*/
void AddLoggerRef(FileWriter* fw)
{
FileLogMap::iterator i = FileLogs.find(fw);
if (i == FileLogs.end())
{
FileLogs.insert(std::make_pair(fw, 1));
}
else
{
++i->second;
}
}
/** Indicates that a FileWriter reference has been removed. Reference count is decreased, and if zeroed, the FileWriter is closed.
*/
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);
}
}
/** Opens all logfiles defined in the configuration file using <log method="file">.
*/
void OpenFileLogs();
/** Removes all LogStreams, meaning they have to be readded for logging to continue.
* Only LogStreams that were listed in AllLogStreams are actually closed.
*/
void CloseLogs();
/** Adds a single LogStream to multiple logtypes.
* This automatically handles things like "* -USERINPUT -USEROUTPUT" to mean all but USERINPUT and USEROUTPUT types.
* It is not a good idea to mix values of autoclose for the same LogStream.
* @param type The type string (from configuration, or whatever) to parse.
* @param l The LogStream to add.
* @param autoclose True to have the LogStream automatically closed when all references to it are removed from LogManager. False to leave it open.
*/
void AddLogTypes(const std::string &type, LogStream *l, bool autoclose);
/** Registers a new logstream into the logging core, so it can be called for future events
* It is not a good idea to mix values of autoclose for the same LogStream.
* @param type The type to add this LogStream to.
* @param l The LogStream to add.
* @param autoclose True to have the LogStream automatically closed when all references to it are removed from LogManager. False to leave it open.
* @return True if the LogStream was added successfully, False otherwise.
*/
bool AddLogType(const std::string &type, LogStream *l, bool autoclose);
/** Removes a logstream from the core. After removal, it will not recieve further events.
* If the LogStream was ever added with autoclose, it will be closed after this call (this means the pointer won't be valid anymore).
*/
void DelLogStream(LogStream* l);
/** Removes a LogStream from a single type. If the LogStream has been registered for "*" it will still receive the type unless you remove it from "*" specifically.
* If the LogStream was added with autoclose set to true, then when the last occurrence of the stream is removed it will automatically be closed (freed).
*/
bool DelLogType(const std::string &type, LogStream *l);
/** Logs an event, sending it to all LogStreams registered for the type.
* @param type Log message type (ex: "USERINPUT", "MODULE", ...)
* @param loglevel Log message level (DEBUG, VERBOSE, DEFAULT, SPARSE, NONE)
* @param msg The message to be logged (literal).
*/
void Log(const std::string &type, int loglevel, const std::string &msg);
/** Logs an event, sending it to all LogStreams registered for the type.
* @param type Log message type (ex: "USERINPUT", "MODULE", ...)
* @param loglevel Log message level (DEBUG, VERBOSE, DEFAULT, SPARSE, NONE)
* @param msg The format of the message to be logged. See your C manual on printf() for details.
*/
void Log(const std::string &type, int loglevel, const char *fmt, ...) CUSTOM_PRINTF(4, 5);
};
#endif
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