122 lines
4.3 KiB
Python
122 lines
4.3 KiB
Python
# osmo_gsm_tester: Event loop
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#
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# Copyright (C) 2016-2017 by sysmocom - s.f.m.c. GmbH
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#
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# Author: Pau Espin Pedrol <pespin@sysmocom.de>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program 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
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import time
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from gi.repository import GLib, GObject
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from . import log
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class DeferredHandling:
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def __init__(self):
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self.defer_queue = []
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def handle_queue(self):
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while self.defer_queue:
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handler, args, kwargs = self.defer_queue.pop(0)
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handler(*args, **kwargs)
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def defer(self, handler, *args, **kwargs):
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self.defer_queue.append((handler, args, kwargs))
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class WaitRequest:
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def __init__(self, condition, condition_args, condition_kwargs, timeout, timestep):
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self.timeout_ack = False
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self.condition_ack = False
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self.timeout_started = time.time()
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self.timeout = timeout
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self.condition = condition
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self.condition_args = condition_args
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self.condition_kwargs = condition_kwargs
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def condition_check(self):
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#print("_wait_condition_check")
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waited = time.time() - self.timeout_started
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if self.condition(*self.condition_args, **self.condition_kwargs):
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self.condition_ack = True
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elif waited > self.timeout:
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self.timeout_ack = True
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class EventLoop:
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def __init__(self):
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self.poll_funcs = []
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self.gloop = GLib.MainLoop()
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self.gctx = self.gloop.get_context()
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self.deferred_handling = DeferredHandling()
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def _trigger_cb_func(self, user_data):
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self.defer(user_data)
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return True #to retrigger the timeout
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def defer(self, handler, *args, **kwargs):
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self.deferred_handling.defer(handler, *args, **kwargs)
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def register_poll_func(self, func, timestep=1):
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id = GObject.timeout_add(timestep*1000, self._trigger_cb_func, func) # in 1/1000th of a sec
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self.poll_funcs.append((func, id))
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def unregister_poll_func(self, func):
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for pair in self.poll_funcs:
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f, id = pair
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if f == func:
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GObject.source_remove(id)
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self.poll_funcs.remove(pair)
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return
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def poll(self, may_block=False):
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self.gctx.iteration(may_block)
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self.deferred_handling.handle_queue()
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def wait_no_raise(self, log_obj, condition, condition_args, condition_kwargs, timeout, timestep):
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if not timeout or timeout < 0:
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self = log_obj
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raise log.Error('wait() *must* time out at some point.', timeout=timeout)
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if timestep < 0.1:
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timestep = 0.1
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wait_req = WaitRequest(condition, condition_args, condition_kwargs, timeout, timestep)
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wait_id = GObject.timeout_add(timestep*1000, self._trigger_cb_func, wait_req.condition_check)
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while True:
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try:
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self.poll(may_block=True)
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except Exception: # cleanup of temporary resources in the wait scope
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GObject.source_remove(wait_id)
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raise
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if wait_req.condition_ack or wait_req.timeout_ack:
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GObject.source_remove(wait_id)
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success = wait_req.condition_ack
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return success
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def wait(self, log_obj, condition, *condition_args, timeout=300, timestep=1, **condition_kwargs):
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if not self.wait_no_raise(log_obj, condition, condition_args, condition_kwargs, timeout, timestep):
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log.ctx(log_obj)
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raise log.Error('Wait timeout', condition=condition, timeout=timeout, timestep=timestep)
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def sleep(self, log_obj, seconds):
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assert seconds > 0.
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self.wait_no_raise(log_obj, lambda: False, [], {}, timeout=seconds, timestep=seconds)
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MainLoop = EventLoop()
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# vim: expandtab tabstop=4 shiftwidth=4
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