1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2010 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
17 /** Simple wrapper providing periodic flushing to a disk-backed file.
19 class CoreExport FileWriter
22 /** The log file (fd is inside this somewhere,
23 * we get it out with fileno())
27 /** Number of write operations that have occured
32 /** The constructor takes an already opened logfile.
34 FileWriter(FILE* logfile);
36 /** Write one or more preformatted log lines.
37 * If the data cannot be written immediately,
38 * this class will insert itself into the
39 * SocketEngine, and register a write event,
40 * and when the write event occurs it will
41 * attempt again to write the data.
43 void WriteLogLine(const std::string &line);
45 /** Close the log file and cancel any events.
47 virtual ~FileWriter();
55 * Logging used to be a simple affair, a FILE * handled by a nonblocking logging class inheriting from EventHandler, that was inserted
56 * into the socket engine, and wrote lines. If nofork was on, it was printf()'d.
58 * We decided to horribly overcomplicate matters, and create vastly customisable logging. LogManager and LogStream form the visible basis
59 * of the new interface. Basically, a LogStream can be inherited to do different things with logging output. We inherit from it once in core
60 * to create a FileLogStream, that writes to a file, for example. Different LogStreams can hook different types of log messages, and different
61 * levels of output too, for extreme customisation. Multiple LogStreams can hook the same message/levels of output, meaning that e.g. output
62 * can go to a channel as well as a file.
65 * LogManager handles all instances of LogStreams, classes derived from LogStream are instantiated and passed to it.
68 /** LogStream base class. Modules (and other stuff) inherit from this to decide what logging they are interested in, and what to do with it.
70 class CoreExport LogStream : public classbase
75 LogStream(int loglevel) : loglvl(loglevel)
79 /* 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
80 * in the event that the resource is shared, see for example FileLogStream).
82 virtual ~LogStream() { }
84 /** Changes the loglevel for this LogStream on-the-fly.
85 * This is needed for -nofork. But other LogStreams could use it to change loglevels.
87 void ChangeLevel(int lvl) { this->loglvl = lvl; }
89 /** Called when there is stuff to log for this particular logstream. The derived class may take no action with it, or do what it
90 * wants with the output, basically. loglevel and type are primarily for informational purposes (the level and type of the event triggered)
91 * and msg is, of course, the actual message to log.
93 virtual void OnLog(int loglevel, const std::string &type, const std::string &msg) = 0;
96 typedef std::map<FileWriter*, int> FileLogMap;
98 class CoreExport LogManager
101 /** Lock variable, set to true when a log is in progress, which prevents further loggging from happening and creating a loop.
105 /** Map of active log types and what LogStreams will receive them.
107 std::map<std::string, std::vector<LogStream *> > LogStreams;
109 /** Refcount map of all LogStreams managed by LogManager.
110 * 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.
112 std::map<LogStream *, int> AllLogStreams;
114 /** LogStreams with type * (which means everything), and a list a logtypes they are excluded from (eg for "* -USERINPUT -USEROUTPUT").
116 std::map<LogStream *, std::vector<std::string> > GlobalLogStreams;
118 /** Refcounted map of all FileWriters in use by FileLogStreams, for file stream sharing.
127 /** Adds a FileWriter instance to LogManager, or increments the reference count of an existing instance.
128 * Used for file-stream sharing for FileLogStreams.
130 void AddLoggerRef(FileWriter* fw)
132 FileLogMap::iterator i = FileLogs.find(fw);
133 if (i == FileLogs.end())
135 FileLogs.insert(std::make_pair(fw, 1));
143 /** Indicates that a FileWriter reference has been removed. Reference count is decreased, and if zeroed, the FileWriter is closed.
145 void DelLoggerRef(FileWriter* fw)
147 FileLogMap::iterator i = FileLogs.find(fw);
148 if (i == FileLogs.end()) return; /* Maybe should log this? */
156 /** Opens all logfiles defined in the configuration file using <log method="file">.
160 /** Removes all LogStreams, meaning they have to be readded for logging to continue.
161 * Only LogStreams that were listed in AllLogStreams are actually closed.
165 /** Adds a single LogStream to multiple logtypes.
166 * This automatically handles things like "* -USERINPUT -USEROUTPUT" to mean all but USERINPUT and USEROUTPUT types.
167 * It is not a good idea to mix values of autoclose for the same LogStream.
168 * @param type The type string (from configuration, or whatever) to parse.
169 * @param l The LogStream to add.
170 * @param autoclose True to have the LogStream automatically closed when all references to it are removed from LogManager. False to leave it open.
172 void AddLogTypes(const std::string &type, LogStream *l, bool autoclose);
174 /** Registers a new logstream into the logging core, so it can be called for future events
175 * It is not a good idea to mix values of autoclose for the same LogStream.
176 * @param type The type to add this LogStream to.
177 * @param l The LogStream to add.
178 * @param autoclose True to have the LogStream automatically closed when all references to it are removed from LogManager. False to leave it open.
179 * @return True if the LogStream was added successfully, False otherwise.
181 bool AddLogType(const std::string &type, LogStream *l, bool autoclose);
183 /** Removes a logstream from the core. After removal, it will not recieve further events.
184 * If the LogStream was ever added with autoclose, it will be closed after this call (this means the pointer won't be valid anymore).
186 void DelLogStream(LogStream* l);
188 /** 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.
189 * 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).
191 bool DelLogType(const std::string &type, LogStream *l);
193 /** Logs an event, sending it to all LogStreams registered for the type.
194 * @param type Log message type (ex: "USERINPUT", "MODULE", ...)
195 * @param loglevel Log message level (DEBUG, VERBOSE, DEFAULT, SPARSE, NONE)
196 * @param msg The message to be logged (literal).
198 void Log(const std::string &type, int loglevel, const std::string &msg);
200 /** Logs an event, sending it to all LogStreams registered for the type.
201 * @param type Log message type (ex: "USERINPUT", "MODULE", ...)
202 * @param loglevel Log message level (DEBUG, VERBOSE, DEFAULT, SPARSE, NONE)
203 * @param msg The format of the message to be logged. See your C manual on printf() for details.
205 void Log(const std::string &type, int loglevel, const char *fmt, ...) CUSTOM_PRINTF(4, 5);