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https://github.com/craigerl/aprsd.git
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127 lines
3.7 KiB
Python
127 lines
3.7 KiB
Python
import logging
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import select
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import time
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import aprslib
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LOG = logging.getLogger("APRSD")
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class Client:
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"""Singleton client class that constructs the aprslib connection."""
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_instance = None
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aprs_client = None
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config = None
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def __new__(cls, *args, **kwargs):
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"""This magic turns this into a singleton."""
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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# Put any initialization here.
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return cls._instance
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def __init__(self, config=None):
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"""Initialize the object instance."""
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if config:
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self.config = config
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@property
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def client(self):
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if not self.aprs_client:
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self.aprs_client = self.setup_connection()
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return self.aprs_client
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def reset(self):
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"""Call this to force a rebuild/reconnect."""
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del self.aprs_client
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def setup_connection(self):
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user = self.config["aprs"]["login"]
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password = self.config["aprs"]["password"]
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host = self.config["aprs"].get("host", "rotate.aprs.net")
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port = self.config["aprs"].get("port", 14580)
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connected = False
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backoff = 1
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while not connected:
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try:
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LOG.info("Creating aprslib client")
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aprs_client = Aprsdis(user, passwd=password, host=host, port=port)
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# Force the logging to be the same
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aprs_client.logger = LOG
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aprs_client.connect()
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connected = True
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backoff = 1
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except Exception as e:
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LOG.error("Unable to connect to APRS-IS server. '{}' ".format(e))
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time.sleep(backoff)
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backoff = backoff * 2
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continue
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LOG.debug("Logging in to APRS-IS with user '%s'" % user)
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return aprs_client
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class Aprsdis(aprslib.IS):
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"""Extend the aprslib class so we can exit properly."""
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# flag to tell us to stop
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thread_stop = False
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# timeout in seconds
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select_timeout = 10
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def stop(self):
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self.thread_stop = True
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LOG.info("Shutdown Aprsdis client.")
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def _socket_readlines(self, blocking=False):
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"""
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Generator for complete lines, received from the server
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"""
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try:
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self.sock.setblocking(0)
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except OSError as e:
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self.logger.error("socket error when setblocking(0): %s" % str(e))
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raise aprslib.ConnectionDrop("connection dropped")
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while not self.thread_stop:
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short_buf = b""
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newline = b"\r\n"
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# set a select timeout, so we get a chance to exit
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# when user hits CTRL-C
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readable, writable, exceptional = select.select(
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[self.sock],
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[],
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[],
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self.select_timeout,
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)
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if not readable:
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continue
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try:
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short_buf = self.sock.recv(4096)
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# sock.recv returns empty if the connection drops
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if not short_buf:
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self.logger.error("socket.recv(): returned empty")
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raise aprslib.ConnectionDrop("connection dropped")
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except OSError as e:
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# self.logger.error("socket error on recv(): %s" % str(e))
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if "Resource temporarily unavailable" in str(e):
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if not blocking:
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if len(self.buf) == 0:
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break
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self.buf += short_buf
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while newline in self.buf:
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line, self.buf = self.buf.split(newline, 1)
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yield line
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def get_client():
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cl = Client()
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return cl.client
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