* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
- * InspIRCd: (C) 2002-2008 InspIRCd Development Team
- * See: http://www.inspircd.org/wiki/index.php/Credits
+ * InspIRCd: (C) 2002-2009 InspIRCd Development Team
+ * See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
EVENT_ERROR = 2
};
+/**
+ * Event mask for SocketEngine events
+ */
+enum EventMask
+{
+ /** Do not test this socket for readability
+ */
+ FD_WANT_NO_READ = 0x1,
+ /** Give a read event at all times when reads will not block.
+ */
+ FD_WANT_POLL_READ = 0x2,
+ /** Give a read event when there is new data to read.
+ *
+ * An event MUST be sent if there is new data to be read, and the most
+ * recent read/recv() on this FD returned EAGAIN. An event MAY be sent
+ * at any time there is data to be read on the socket.
+ */
+ FD_WANT_FAST_READ = 0x4,
+ /** Give an optional read event when reads begin to unblock
+ *
+ * This state is useful if you want to leave data in the OS receive
+ * queue but not get continuous event notifications about it, because
+ * it may not require a system call to transition from FD_WANT_FAST_READ
+ */
+ FD_WANT_EDGE_READ = 0x8,
+
+ /** Mask for all read events */
+ FD_WANT_READ_MASK = 0x0F,
+
+ /** Do not test this socket for writeability
+ */
+ FD_WANT_NO_WRITE = 0x10,
+ /** Give a write event at all times when writes will not block.
+ *
+ * You probably shouldn't use this state; if it's likely that the write
+ * will not block, try it first, then use FD_WANT_FAST_WRITE if it
+ * fails. If it's likely to block (or you are using polling-style reads)
+ * then use FD_WANT_SINGLE_WRITE.
+ */
+ FD_WANT_POLL_WRITE = 0x20,
+ /** Give a write event when writes don't block any more
+ *
+ * An event MUST be sent if writes will not block, and the most recent
+ * write/send() on this FD returned EAGAIN, or connect() returned
+ * EINPROGRESS. An event MAY be sent at any time that writes will not
+ * block.
+ *
+ * Before calling HandleEvent, a socket engine MAY change the state of
+ * the FD back to FD_WANT_EDGE_WRITE if it is simpler (for example, if a
+ * one-shot notification was registered). If further writes are needed,
+ * it is the responsibility of the event handler to change the state to
+ * one that will generate the required notifications
+ */
+ FD_WANT_FAST_WRITE = 0x40,
+ /** Give an optional write event on edge-triggered write unblock.
+ *
+ * This state is useful to avoid system calls when moving to/from
+ * FD_WANT_FAST_WRITE when writing data to a mostly-unblocked socket.
+ */
+ FD_WANT_EDGE_WRITE = 0x80,
+ /** Request a one-shot poll-style write notification. The socket will
+ * return to the FD_WANT_NO_WRITE state before HandleEvent is called.
+ */
+ FD_WANT_SINGLE_WRITE = 0x100,
+
+ /** Mask for all write events */
+ FD_WANT_WRITE_MASK = 0x1F0,
+
+ /** Add a trial read. During the next DispatchEvents invocation, this
+ * will call HandleEvent with EVENT_READ unless reads are known to be
+ * blocking.
+ */
+ FD_ADD_TRIAL_READ = 0x1000,
+ /** Assert that reads are known to block. This cancels FD_ADD_TRIAL_READ.
+ * Reset by SE before running EVENT_READ
+ */
+ FD_READ_WILL_BLOCK = 0x2000,
+
+ /** Add a trial write. During the next DispatchEvents invocation, this
+ * will call HandleEvent with EVENT_WRITE unless writes are known to be
+ * blocking.
+ *
+ * This could be used to group several writes together into a single
+ * send() syscall, or to ensure that writes are blocking when attempting
+ * to use FD_WANT_FAST_WRITE.
+ */
+ FD_ADD_TRIAL_WRITE = 0x4000,
+ /** Assert that writes are known to block. This cancels FD_ADD_TRIAL_WRITE.
+ * Reset by SE before running EVENT_WRITE
+ */
+ FD_WRITE_WILL_BLOCK = 0x8000,
+
+ /** Mask for trial read/trial write */
+ FD_TRIAL_NOTE_MASK = 0x5000
+};
+
class InspIRCd;
+class Module;
/** This class is a basic I/O handler class.
* Any object which wishes to receive basic I/O events
*/
class CoreExport EventHandler : public Extensible
{
+ private:
+ /** Private state maintained by socket engine */
+ int event_mask;
protected:
/** File descriptor.
- * All events which can be handled
- * must have a file descriptor.
- * This allows you to add events for
- * sockets, fifo's, pipes, and various
- * other forms of IPC.
+ * All events which can be handled must have a file descriptor. This
+ * allows you to add events for sockets, fifo's, pipes, and various
+ * other forms of IPC. Do not change this while the object is
+ * registered with the SocketEngine
*/
int fd;
public:
-
/** Get the current file descriptor
* @return The file descriptor of this handler
*/
- int GetFd();
+ inline int GetFd() const { return fd; }
+
+ inline int GetEventMask() const { return event_mask; }
/** Set a new file desciptor
- * @param FD The new file descriptor. Do not
- * call this method without first deleting the
- * object from the SocketEngine if you have
+ * @param FD The new file descriptor. Do not call this method without
+ * first deleting the object from the SocketEngine if you have
* added it to a SocketEngine instance.
*/
void SetFd(int FD);
/** Constructor
*/
- EventHandler() {}
+ EventHandler();
/** Destructor
*/
virtual ~EventHandler() {}
- /** Override this function to indicate readability.
- * @return This should return true if the function
- * wishes to receive EVENT_READ events. Do not change
- * what this function returns while the event handler
- * is still added to a SocketEngine instance!
- * If this function is unimplemented, the base class
- * will return true.
- *
- * NOTE: You cannot set both Readable() and
- * Writeable() to true. If you wish to receive
- * a write event for your object, you must call
- * SocketEngine::WantWrite() instead. This will
- * trigger your objects next EVENT_WRITE type event.
- */
- virtual bool Readable();
-
- /** Override this function to indicate writeability.
- * @return This should return true if the function
- * wishes to receive EVENT_WRITE events. Do not change
- * what this function returns while the event handler
- * is still added to a SocketEngine instance!
- * If this function is unimplemented, the base class
- * will return false.
- *
- * NOTE: You cannot set both Readable() and
- * Writeable() to true. If you wish to receive
- * a write event for your object, you must call
- * SocketEngine::WantWrite() instead. This will
- * trigger your objects next EVENT_WRITE type event.
- */
- virtual bool Writeable();
-
/** Process an I/O event.
* You MUST implement this function in your derived
* class, and it will be called whenever read or write
- * events are received, depending on what your functions
- * Readable() and Writeable() returns and wether you
- * previously made a call to SocketEngine::WantWrite().
+ * events are received.
* @param et either one of EVENT_READ for read events,
* and EVENT_WRITE for write events.
*/
virtual void HandleEvent(EventType et, int errornum = 0) = 0;
+
+ friend class SocketEngine;
};
/** Provides basic file-descriptor-based I/O support.
* have to be aware of which SocketEngine derived
* class they are using.
*/
-class CoreExport SocketEngine : public Extensible
+class CoreExport SocketEngine
{
-protected:
- /** Owner/Creator
- */
- InspIRCd* ServerInstance;
- /** Handle to socket engine, where needed.
- */
- int EngineHandle;
+ protected:
/** Current number of descriptors in the engine
*/
int CurrentSetSize;
/** Reference table, contains all current handlers
*/
- EventHandler* ref[MAX_DESCRIPTORS];
+ EventHandler** ref;
+ /** List of handlers that want a trial read/write
+ */
+ std::set<int> trials;
+
+ int MAX_DESCRIPTORS;
+
+ size_t indata;
+ size_t outdata;
+ time_t lastempty;
+
+ void UpdateStats(size_t len_in, size_t len_out);
+
+ virtual void OnSetEvent(EventHandler* eh, int old_mask, int new_mask) = 0;
+ void SetEventMask(EventHandler* eh, int value);
public:
double TotalEvents;
* failure (for example, you try and enable
* epoll on a 2.4 linux kernel) then this
* function may bail back to the shell.
- * @param Instance The creator/owner of this object
*/
- SocketEngine(InspIRCd* Instance);
+ SocketEngine();
/** Destructor.
* The destructor transparently tidies up
*/
virtual ~SocketEngine();
- /** Add an EventHandler object to the engine.
- * Use AddFd to add a file descriptor to the
- * engine and have the socket engine monitor
- * it. You must provide an object derived from
- * EventHandler which implements HandleEvent()
- * and optionally Readable() and Writeable().
+ /** Add an EventHandler object to the engine. Use AddFd to add a file
+ * descriptor to the engine and have the socket engine monitor it. You
+ * must provide an object derived from EventHandler which implements
+ * HandleEvent().
* @param eh An event handling object to add
+ * @param event_mask The initial event mask for the object
*/
- virtual bool AddFd(EventHandler* eh);
+ virtual bool AddFd(EventHandler* eh, int event_mask) = 0;
/** If you call this function and pass it an
* event handler, that event handler will
* an eventhandler in the writeable state,
* as this will consume large amounts of
* CPU time.
- * @param eh An event handler which wants to
- * receive the next writeability event.
+ * @param eh The event handler to change
+ * @param event_mask The changes to make to the wait state
*/
- virtual void WantWrite(EventHandler* eh);
+ void ChangeEventMask(EventHandler* eh, int event_mask);
- /** Returns the maximum number of file descriptors
- * you may store in the socket engine at any one time.
+ /** Returns the highest file descriptor you may store in the socket engine
* @return The maximum fd value
*/
- virtual int GetMaxFds();
+ inline int GetMaxFds() const { return MAX_DESCRIPTORS; }
- /** Returns the number of file descriptor slots
- * which are available for storing fds.
- * @return The number of remaining fd's
+ /** Returns the number of file descriptors being queried
+ * @return The set size
*/
- virtual int GetRemainingFds();
+ inline int GetUsedFds() const { return CurrentSetSize; }
/** Delete an event handler from the engine.
* This function call deletes an EventHandler
* @param force *DANGEROUS* See method description!
* @return True if the event handler was removed
*/
- virtual bool DelFd(EventHandler* eh, bool force = false);
+ virtual bool DelFd(EventHandler* eh, bool force = false) = 0;
/** Returns true if a file descriptor exists in
* the socket engine's list.
*/
virtual EventHandler* GetRef(int fd);
- /** Waits for events and dispatches them to handlers.
- * Please note that this doesnt wait long, only
- * a couple of milliseconds. It returns the number of
- * events which occured during this call.
- * This method will dispatch events to their handlers
- * by calling their EventHandler::HandleEvent()
- * methods with the neccessary EventType value.
+ /** Waits for events and dispatches them to handlers. Please note that
+ * this doesn't wait long, only a couple of milliseconds. It returns the
+ * number of events which occurred during this call. This method will
+ * dispatch events to their handlers by calling their
+ * EventHandler::HandleEvent() methods with the necessary EventType
+ * value.
* @return The number of events which have occured.
*/
- virtual int DispatchEvents();
+ virtual int DispatchEvents() = 0;
- /** Returns the socket engines name.
- * This returns the name of the engine for use
- * in /VERSION responses.
+ /** Dispatch trial reads and writes. This causes the actual socket I/O
+ * to happen when writes have been pre-buffered.
+ */
+ virtual void DispatchTrialWrites();
+
+ /** Returns the socket engines name. This returns the name of the
+ * engine for use in /VERSION responses.
* @return The socket engine name
*/
- virtual std::string GetName();
+ virtual std::string GetName() = 0;
- /** Returns true if the file descriptors in the
- * given event handler are within sensible ranges
- * which can be handled by the socket engine.
+ /** Returns true if the file descriptors in the given event handler are
+ * within sensible ranges which can be handled by the socket engine.
*/
virtual bool BoundsCheckFd(EventHandler* eh);
* the shell or operating system on fatal error.
*/
virtual void RecoverFromFork();
+
+ /** Get data transfer statistics, kilobits per second in and out and total.
+ */
+ void GetStats(float &kbitpersec_in, float &kbitpersec_out, float &kbitpersec_total);
};
+SocketEngine* CreateSocketEngine();
+
#endif
projects / user / henk / code / inspircd.git / blobdiff