/* +------------------------------------+ * | 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 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 { 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 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 > 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 AllLogStreams; /** LogStreams with type * (which means everything), and a list a logtypes they are excluded from (eg for "* -USERINPUT -USEROUTPUT"). */ std::map > 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 . */ 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