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import os, sys |
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import socket as s |
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from rsudp import printM, printW, printE |
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import rsudp.raspberryshake as rs |
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from rsudp.test import TEST |
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class Forward(rs.ConsumerThread): |
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""" |
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Single-destination data forwarding module. This consumer reads |
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queue messages from the :class:`rsudp.c_consumer.Consumer` |
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and forwards those messages to a specified address and port. |
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Multiple of these threads can be started in order to deliver to |
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more than one destination. (see the :ref:`datacast-forwarding` |
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section in :doc:`settings`) |
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.. versionadded:: 1.0.2 |
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The option to choose whether to forward either data or alarms or both |
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(find boolean settings :code:`"fwd_data"` and :code:`"fwd_alarms"` in |
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settings json files built by this version and later). |
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:param str addr: IP address to pass UDP data to |
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:param str port: network port to pass UDP data to (at specified address) |
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:param bool fwd_data: whether or not to forward raw data packets |
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:param bool fwd_alarms: whether or not to forward :code:`ALARM` and :code:`RESET` messages |
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:param cha: channel(s) to forward. others will be ignored. |
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:type cha: str or list |
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:param queue.Queue q: queue of data and messages sent by :class:`rsudp.c_consumer.Consumer` |
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""" |
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def __init__(self, num, addr, port, fwd_data, fwd_alarms, cha, q, testing=False): |
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""" |
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Initializes data forwarding module. |
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""" |
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super().__init__() |
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self.sender = 'Forward #%s (%s:%s)' % (num, addr, port) |
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self.queue = q |
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self.testing = testing |
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self.addr = addr |
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self.port = port |
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self.fwd_data = fwd_data |
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self.fwd_alarms = fwd_alarms |
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self.chans = [] |
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cha = rs.chns if (cha == 'all') else cha |
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cha = list(cha) if isinstance(cha, str) else cha |
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l = rs.chns |
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for c in l: |
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n = 0 |
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for uch in cha: |
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if (uch.upper() in c) and (c not in str(self.chans)): |
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self.chans.append(c) |
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n += 1 |
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if len(self.chans) < 1: |
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self.chans = rs.chns |
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self.running = True |
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self.alive = True |
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printM('Starting.', self.sender) |
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def _exit(self): |
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""" |
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Exits the thread. |
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""" |
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self.alive = False |
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printM('Exiting.', self.sender) |
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sys.exit() |
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def run(self): |
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""" |
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Gets and distributes queue objects to another address and port on the network. |
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""" |
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printM('Opening socket...', sender=self.sender) |
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socket_type = s.SOCK_DGRAM if os.name in 'nt' else s.SOCK_DGRAM | s.SO_REUSEADDR |
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sock = s.socket(s.AF_INET, socket_type) |
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msg_data = '%s data' % (self.chans) if self.fwd_data else '' |
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msg_and = ' and ' if (self.fwd_data and self.fwd_alarms) else '' |
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msg_alarms = 'ALARM / RESET messages' if self.fwd_alarms else '' |
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printM('Forwarding %s%s%s to %s:%s' % (msg_data, msg_and, msg_alarms, self.addr, |
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self.port), sender=self.sender) |
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try: |
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while self.running: |
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p = self.queue.get() # get a packet |
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self.queue.task_done() # close the queue |
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if 'TERM' in str(p): # shutdown if there's a TERM message on the queue |
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self._exit() |
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if 'IMGPATH' in str(p): |
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continue |
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if ('ALARM' in str(p)) or ('RESET' in str(p)): |
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if self.fwd_alarms: |
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sock.sendto(p, (self.addr, self.port)) |
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continue |
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if "{'" in str(p): |
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if (self.fwd_data) and (rs.getCHN(p) in self.chans): |
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sock.sendto(p, (self.addr, self.port)) |
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if self.testing: |
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TEST['c_forward'][1] = True |
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except Exception as e: |
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self.alive = False |
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printE('%s' % e, sender=self.sender) |
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if self.testing: |
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TEST['c_forward'][1] = False |
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sys.exit(2) |
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raspishake /
rsudp
