author | Tero Marttila <terom@fixme.fi> |
Sat, 26 Sep 2009 16:39:20 +0300 | |
changeset 50 | da394bb715af |
parent 47 | b45a6648931c |
child 52 | 722fc70a197a |
permissions | -rw-r--r-- |
39 | 1 |
from qmsk.net.lib.event2.event cimport * |
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from qmsk.net.lib.event2.base cimport event_base |
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cimport qmsk.net.py as py |
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cdef lib.timeval* build_timeout (lib.timeval *tv, object timeout = None) except? <lib.timeval *>-1 : |
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""" |
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If a timeout is given, it is treated as a float and stored in *tv, which is returned. Otherwise, simply returns |
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NULL. |
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""" |
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cdef double t |
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if timeout is not None : |
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t = timeout |
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tv.tv_sec = <int>(t) |
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tv.tv_usec = <int>((t - <int> t) * 100000) |
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return tv |
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else : |
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return NULL |
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# our shared callback handler |
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# this must aquire the GIL before invoking the python object |
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# this means that the libevent loop *must* be run with the GIL released! |
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cdef void ev_callback (lib.evutil_socket_t fd, short mask, void *arg) with gil : |
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""" |
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Proxy event back to event object passed as arg |
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""" |
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# unpack opaque arg |
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cdef event ev = <event>arg |
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# drop self-ref if not pending anymore (keep the local ref) |
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# XXX: does the event show up as non-pending here? :/ |
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ev._unmark() |
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# invoke |
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# XXX: logging? |
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ev(fd, mask) |
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cdef class event : |
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def __init__ (self, event_base base not None, lib.evutil_socket_t fd, short events) : |
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# we don't hold a self-reference yet |
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self.alive = False |
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# libevent seems to segfault otherwise... |
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if events & (lib.EV_READ | lib.EV_WRITE) and fd < 0 : |
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raise ValueError(fd) |
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# construct event using our internal callback, with self as the arg |
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self.ev = lib.event_new(base.ev_base, fd, events, ev_callback, <void *>self) |
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if self.ev == NULL : |
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raise Exception("event_new") |
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def assign (self, event_base base not None, lib.evutil_socket_t fd, short events) : |
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""" |
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Re-assign our event parameters to the given ones. |
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It is illegal to call this method after calling .add() but before del()/callback! |
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""" |
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if self.alive : |
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raise RuntimeError("Cannot change event while active") |
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# interesting... no error return code |
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lib.event_assign(self.ev, base.ev_base, fd, events, ev_callback, <void *>self) |
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def add (self, timeout = None) : |
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""" |
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Add this event to our event_base's set of monitored events. |
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This event will be executed if any of the events specified in 'events' occurs, or the given timeout |
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expires. If no timeout is given, no timeout will occur. |
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If this event already has a shceduled timeout, the old timeout will be replaced by the new one. |
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timeout - a float representing the timeout length |
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XXX: "The event in the ev argument must be already initialized by event_set() and may not be used in calls to event_set() until it has timed out or been removed with event_del()" -- enforce |
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""" |
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cdef lib.timeval tv |
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# aquire self-ref |
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self._mark() |
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if lib.event_add(self.ev, build_timeout(&tv, timeout)) < 0 : |
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raise Exception("event_new") |
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def delete (self) : |
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""" |
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Remove this event from our event_base's set of monitored events. |
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If this event has already executed or has never been added this call with have no effect. |
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""" |
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if lib.event_del(self.ev) < 0 : |
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raise Exception("event_del") |
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# release self-ref |
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self._unmark() |
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def activate (self, int fd, short mask) : |
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""" |
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'Fake' this event as active, triggering the callback. |
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""" |
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# aquire self-ref |
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self._mark() |
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lib.event_active(self.ev, fd, mask) |
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cpdef pending (self, short mask = 0xffff) : |
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""" |
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Returns a bool indicating if this event is pending (that is, has been .add()'d). |
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For convenience, this defaults to testing all possible flags, and so will return true if any events are |
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pending. |
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XXX: support returning timeout value? |
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""" |
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return bool(lib.event_pending(self.ev, mask, NULL)) |
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cdef object _mark (self) : |
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""" |
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Refcount magic. Aquires an internal reference *if we don't have one yet*. |
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""" |
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if not self.alive : |
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self.alive = True |
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py.Py_INCREF(self) |
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cdef object _unmark (self) : |
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""" |
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Refcout magic. Releses the internal reference *if we have one* and libevent doesn't think this event is |
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pending anymore. |
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XXX: this might cause ourselves to be destroyed... we can't break if that happens. |
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""" |
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if self.alive and not self.pending() : |
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py.Py_DECREF(self) |
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self.alive = False |
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property fd : |
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def __get__ (self) : |
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""" |
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Get the OS file descriptor associated with this event. |
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""" |
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return lib.event_get_fd(self.ev) |
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def __call__ (self, lib.evutil_socket_t fd, short mask) : |
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""" |
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The method invoked by the internal libevent callback when the event becomes active. |
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fd - OS file descriptor the event occured on, or -1 |
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mask - bitmask of EV_* flags that represents the triggered event |
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The default implementation of __call__ does nothing. The method's return value will be ignored, and should |
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be None. Any errors raised by the callback will be printed out as warning messages, and ignored. |
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""" |
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pass |
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def __dealloc__ (self) : |
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""" |
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Release the event object usign event_free. This should be completely safe as regards our event_base. |
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XXX: what happens if event_base's __dealloc__ is triggered, but there are still event objects alive? |
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""" |
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if self.ev != NULL : |
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lib.event_free(self.ev) |
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class CallbackEvent (event) : |
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""" |
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Extends the event type to take a callback and additional arguments to invoke from the __call__ method. |
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""" |
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def __init__ (self, event_base base, lib.evutil_socket_t fd, short events, object callback, *args, **kwargs) : |
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# parent |
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super(CallbackEvent, self).__init__(base, fd, events) |
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# store |
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self.callback = callback |
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self.args = args |
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self.kwargs = kwargs |
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def __call__ (self, lib.evutil_socket_t fd, short mask) : |
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self.callback(fd, mask, *self.args, **self.kwargs) |
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