236 lines
7.6 KiB
Cython
236 lines
7.6 KiB
Cython
# Copyright (C) 2007-2014 various contributors (see AUTHORS)
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#
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# This file is part of Python-EFL.
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#
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# Python-EFL is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 3 of the License, or (at your option) any later version.
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#
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# Python-EFL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this Python-EFL. If not, see <http://www.gnu.org/licenses/>.
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cdef void fd_handler_prepare_cb(void *data, Ecore_Fd_Handler *fdh) with gil:
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cdef FdHandler obj = <FdHandler>data
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cdef int r
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if obj._prepare_callback is None:
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return
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func, args, kargs = obj._prepare_callback
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try:
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func(obj, *args, **kargs)
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except Exception:
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traceback.print_exc()
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cdef flags2str(int value):
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flags = []
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if value & <int>ECORE_FD_READ:
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flags.append("READ")
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if value & <int>ECORE_FD_WRITE:
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flags.append("WRITE")
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if value & <int>ECORE_FD_ERROR:
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flags.append("ERROR")
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return ", ".join(flags)
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cdef Eina_Bool fd_handler_cb(void *data, Ecore_Fd_Handler *fdh) with gil:
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cdef FdHandler obj = <FdHandler>data
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cdef Eina_Bool r
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try:
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r = bool(obj._exec())
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except Exception:
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traceback.print_exc()
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r = 0
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if not r:
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obj.delete()
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return r
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cdef class FdHandler(object):
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"""Adds a callback for activity on the given file descriptor.
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``func`` will be called during the execution of ``main_loop_begin()``
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when the file descriptor is available for reading, or writing, or both.
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When the handler ``func`` is called, it must return a value of
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either *True* or *False* (remember that Python returns *None* if no value
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is explicitly returned and *None* evaluates to *False*). If it returns
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*True*, it will continue to monitor the given file descriptor, or if
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it returns *False* it will be deleted automatically making any
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references/handles for it invalid.
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FdHandler use includes:
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- handle multiple socket connections using a single process;
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- thread wake-up and synchronization;
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- non-blocking file description operations.
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:param fd: file descriptor or object with fileno() method.
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:param flags: bitwise OR of ECORE_FD_READ, ECORE_FD_WRITE...
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:param func:
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function to call when file descriptor state changes.
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Expected signature::
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func(fd_handler, *args, **kargs): bool
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"""
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def __init__(self, fd, int flags, func, *args, **kargs):
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if not callable(func):
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raise TypeError("Parameter 'func' must be callable")
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self.func = func
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self.args = args
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self.kargs = kargs
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self._prepare_callback = None
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if self.obj == NULL:
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if not isinstance(fd, (int, long)):
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try:
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fd = fd.fileno()
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except AttributeError:
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raise ValueError("fd must be integer or have fileno()")
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self.obj = ecore_main_fd_handler_add(fd,
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<Ecore_Fd_Handler_Flags>flags,
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fd_handler_cb, <void *>self,
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NULL, NULL)
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if self.obj != NULL:
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Py_INCREF(self)
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def __str__(self):
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if self.obj == NULL:
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fd = None
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flags = ""
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else:
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fd = self.fd_get()
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flags = flags2str(self.active_get(7))
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return "%s(func=%s, args=%s, kargs=%s, fd=%s, flags=[%s])" % \
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(self.__class__.__name__, self.func, self.args, self.kargs,
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fd, flags)
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def __repr__(self):
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if self.obj == NULL:
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fd = None
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flags = ""
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else:
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fd = self.fd_get()
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flags = flags2str(self.active_get(7))
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return ("%s(%#x, func=%s, args=%s, kargs=%s, fd=%s, flags=[%s], "
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"Ecore_Fd_Handler=%#x, refcount=%d)") % \
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(self.__class__.__name__, <uintptr_t><void *>self,
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self.func, self.args, self.kargs, fd, flags,
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<uintptr_t>self.obj, PY_REFCOUNT(self))
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def __dealloc__(self):
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if self.obj != NULL:
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ecore_main_fd_handler_del(self.obj)
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self.obj = NULL
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self.func = None
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self.args = None
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self.kargs = None
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cdef object _exec(self):
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return self.func(self, *self.args, **self.kargs)
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def delete(self):
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"""Stop callback emission and free internal resources."""
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if self.obj != NULL:
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ecore_main_fd_handler_del(self.obj)
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self.obj = NULL
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Py_DECREF(self)
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def stop(self):
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"""Alias for ``delete``."""
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self.delete()
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def fd_get(self):
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""" Get the file descriptor number
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:rtype: int
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"""
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return ecore_main_fd_handler_fd_get(self.obj)
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property fd:
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def __get__(self):
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return self.fd_get()
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def active_get(self, int flags):
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"""Return if read, write or error, or a combination thereof, is
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active on the file descriptor of the given FD handler.
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:rtype: bool
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"""
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cdef Ecore_Fd_Handler_Flags v = <Ecore_Fd_Handler_Flags>flags
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return bool(ecore_main_fd_handler_active_get(self.obj, v))
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def active_set(self, int flags):
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"""Set what active streams the given FdHandler should be monitoring.
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:param flags:
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one of
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- ECORE_FD_NONE
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- ECORE_FD_READ
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- ECORE_FD_WRITE
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- ECORE_FD_ERROR
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- ECORE_FD_ALL
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"""
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cdef Ecore_Fd_Handler_Flags v = <Ecore_Fd_Handler_Flags>flags
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ecore_main_fd_handler_active_set(self.obj, v)
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def can_read(self):
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""":rtype: bool"""
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return bool(ecore_main_fd_handler_active_get(self.obj, ECORE_FD_READ))
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def can_write(self):
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""":rtype: bool"""
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return bool(ecore_main_fd_handler_active_get(self.obj, ECORE_FD_WRITE))
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def has_error(self):
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""":rtype: bool"""
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return bool(ecore_main_fd_handler_active_get(self.obj, ECORE_FD_ERROR))
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def prepare_callback_set(self, func, *args, **kargs):
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"""Set a function to call before doing the select() on the fd.
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Expected signature::
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function(object, *args, **kargs)
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"""
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if func is None:
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self._prepare_callback = None
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ecore_main_fd_handler_prepare_callback_set(self.obj, NULL, NULL)
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elif callable(func):
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self._prepare_callback = (func, args, kargs)
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ecore_main_fd_handler_prepare_callback_set(self.obj,
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fd_handler_prepare_cb,
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<void *>self)
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else:
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raise TypeError("Parameter 'func' must be callable")
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def fd_handler_add(fd, int flags, func, *args, **kargs):
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""":py:class:`FdHandler` factory, for C-api compatibility.
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``func`` signature::
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func(fd_handler, *args, **kargs): bool
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:param fd: file descriptor or object with ``fileno()`` method.
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:param flags: bitwise OR of ECORE_FD_READ, ECORE_FD_WRITE...
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:param func: function to call when file descriptor state changes.
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:rtype: `efl.ecore.FdHandler`
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"""
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return FdHandler(fd, flags, func, *args, **kargs)
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