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"""Kytos Buffer Classes, based on Python Queue.""" |
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import logging |
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from janus import PriorityQueue, Queue |
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from kytos.core.config import KytosConfig |
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from kytos.core.events import KytosEvent |
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from kytos.core.helpers import get_thread_pool_max_workers |
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from .buffers import KytosEventBuffer |
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from .factory import buffer_from_config |
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LOG = logging.getLogger(__name__) |
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class KytosBuffers: |
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"""Set of KytosEventBuffer used in Kytos.""" |
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def __init__(self): |
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"""Build four KytosEventBuffers. |
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:attr:`conn`: :class:`~kytos.core.buffers.KytosEventBuffer` with events |
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received from connection events. |
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:attr:`raw`: :class:`~kytos.core.buffers.KytosEventBuffer` with events |
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received from network. |
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:attr:`msg_in`: :class:`~kytos.core.buffers.KytosEventBuffer` with |
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events to be received. |
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:attr:`msg_out`: :class:`~kytos.core.buffers.KytosEventBuffer` with |
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events to be sent. |
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:attr:`app`: :class:`~kytos.core.buffers.KytosEventBuffer` with events |
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sent to NApps. |
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:attr:`meta`: :class:`~kytos.core.buffers.KytosEventBuffer` with |
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core related events sent to NApps. This is meant for general core |
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control events. |
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""" |
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self._pool_max_workers = get_thread_pool_max_workers() |
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self.conn = KytosEventBuffer("conn") |
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self.raw = KytosEventBuffer( |
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"raw", |
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queue=Queue(maxsize=self._get_maxsize("sb")) |
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) |
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self.msg_in = KytosEventBuffer( |
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"msg_in", |
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queue=PriorityQueue(maxsize=self._get_maxsize("sb")), |
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) |
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self.msg_out = KytosEventBuffer( |
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"msg_out", |
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queue=PriorityQueue(maxsize=self._get_maxsize("sb")), |
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) |
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self.app = KytosEventBuffer( |
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"app", |
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queue=Queue(maxsize=self._get_maxsize("app")), |
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) |
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self.meta = KytosEventBuffer("meta") |
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buffer_conf = KytosConfig().options['daemon'].event_buffer_conf |
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for name, config in buffer_conf.items(): |
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setattr(self, name, buffer_from_config(name, config)) |
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def get_all_buffers(self): |
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"""Get all KytosEventBuffer instances.""" |
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return [ |
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event_buffer for event_buffer in self.__dict__.values() |
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if isinstance(event_buffer, KytosEventBuffer) |
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] |
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def _get_maxsize(self, queue_name): |
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"""Get queue maxsize if it's been set.""" |
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return self._pool_max_workers.get(queue_name, 0) |
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def send_stop_signal(self): |
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"""Send a ``kytos/core.shutdown`` event to each buffer.""" |
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LOG.info('Stop signal received by Kytos buffers.') |
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LOG.info('Sending KytosShutdownEvent to all apps.') |
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event = KytosEvent(name='kytos/core.shutdown') |
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for buffer in self.get_all_buffers(): |
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buffer.put(event) |
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kytos-ng /
kytos
