313 lines
9.4 KiB
Python
313 lines
9.4 KiB
Python
# aprslib - Python library for working with APRS
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# Copyright (C) 2013-2014 Rossen Georgiev
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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 published by
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# the Free Software Foundation; either version 2 of the License, or
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# (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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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IS class is used for connection to APRS-IS network
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"""
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import socket
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import select
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import time
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import logging
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import sys
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from . import __version__
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from .parse import parse
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from .exceptions import (
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GenericError,
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ConnectionDrop,
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ConnectionError,
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LoginError,
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ParseError,
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UnknownFormat,
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)
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__all__ = ['IS']
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logging.addLevelName(11, "ParseError")
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logging.addLevelName(9, "UnknownFormat")
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class IS(object):
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"""
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The IS class is used to connect to aprs-is network and listen to the stream
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of packets. You can either run them through aprs.parse() or get them in raw
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form.
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Note: sending of packets is not supported yet
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"""
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def __init__(self, callsign, passwd="-1", host="rotate.aprs.net", port=10152):
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"""
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callsign - used when login in
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passwd - for verification, or "-1" if only listening
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Host & port - aprs-is server
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"""
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self.logger = logging.getLogger(__name__)
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self._parse = parse
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self.set_server(host, port)
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self.set_login(callsign, passwd)
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self.sock = None
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self.filter = "" # default filter, everything
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self._connected = False
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self.buf = ''
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def set_filter(self, filter_text):
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"""
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Set a specified aprs-is filter for this connection
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"""
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self.filter = filter_text
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self.logger.info("Setting filter to: %s", self.filter)
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if self._connected:
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self.sock.sendall("#filter %s\r\n" % self.filter)
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def set_login(self, callsign, passwd):
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"""
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Set callsign and password
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"""
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self.callsign = callsign
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self.passwd = passwd
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def set_server(self, host, port):
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"""
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Set server ip/host and port to use
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"""
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self.server = (host, port)
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def connect(self, blocking=False, retry=30):
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"""
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Initiate connection to APRS server and attempt to login
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blocking = False - Should we block until connected and logged-in
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retry = 30 - Retry interval in seconds
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"""
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if self._connected:
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return
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while True:
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try:
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self._connect()
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self._send_login()
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break
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except:
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if not blocking:
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raise
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time.sleep(retry)
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def close(self):
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"""
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Closes the socket
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Called internally when Exceptions are raised
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"""
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self._connected = False
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self.buf = ''
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if self.sock is not None:
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self.sock.close()
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def consumer(self, callback, blocking=True, immortal=False, raw=False):
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"""
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When a position sentence is received, it will be passed to the callback function
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blocking: if true (default), runs forever, otherwise will return after one sentence
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You can still exit the loop, by raising StopIteration in the callback function
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immortal: When true, consumer will try to reconnect and stop propagation of Parse exceptions
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if false (default), consumer will return
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raw: when true, raw packet is passed to callback, otherwise the result from aprs.parse()
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"""
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if not self._connected:
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raise ConnectionError("not connected to a server")
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line = ''
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while True:
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try:
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for line in self._socket_readlines(blocking):
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if line[0] != "#":
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if raw:
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callback(line)
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else:
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callback(self._parse(line))
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else:
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self.logger.debug("Server: %s", line)
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except ParseError as exp:
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self.logger.log(11, "%s\n Packet: %s", exp.message, exp.packet)
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except UnknownFormat as exp:
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self.logger.log(9, "%s\n Packet: %s", exp.message, exp.packet)
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except LoginError as exp:
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self.logger.error("%s: %s", exp.__class__.__name__, exp.message)
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except (KeyboardInterrupt, SystemExit):
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raise
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except (ConnectionDrop, ConnectionError):
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self.close()
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if not immortal:
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raise
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else:
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self.connect(blocking=blocking)
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continue
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except GenericError:
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pass
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except StopIteration:
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break
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except:
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self.logger.error("APRS Packet: %s", line)
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raise
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if not blocking:
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break
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def _open_socket(self):
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"""
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Creates a socket
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"""
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self.sock = socket.create_connection(self.server, 15)
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def _connect(self):
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"""
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Attemps connection to the server
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"""
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self.logger.info("Attempting connection to %s:%s", self.server[0], self.server[1])
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try:
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self._open_socket()
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raddr, rport = self.sock.getpeername()
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self.logger.info("Connected to %s:%s", raddr, rport)
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# 5 second timeout to receive server banner
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self.sock.setblocking(1)
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self.sock.settimeout(5)
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self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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if sys.platform not in ['cygwin', 'win32']:
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# these things don't exist in socket under Windows
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# pylint: disable=E1103
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self.sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE, 15)
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self.sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT, 3)
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self.sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPINTVL, 5)
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# pylint: enable=E1103
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banner = self.sock.recv(512)
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if banner[0] == "#":
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self.logger.debug("Banner: %s", banner.rstrip())
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else:
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raise ConnectionError("invalid banner from server")
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except ConnectionError:
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self.close()
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raise
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except (socket.error, socket.timeout) as e:
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self.close()
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if str(e) == "timed out":
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raise ConnectionError("no banner from server")
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else:
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raise ConnectionError(e)
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self._connected = True
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def _send_login(self):
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"""
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Sends login string to server
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"""
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login_str = "user {0} pass {1} vers aprslib {3}{2}\r\n"
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login_str = login_str.format(
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self.callsign,
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self.passwd,
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(" filter " + self.filter) if self.filter != "" else "",
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__version__
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)
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self.logger.info("Sending login information")
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try:
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self.sock.sendall(login_str)
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self.sock.settimeout(5)
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test = self.sock.recv(len(login_str) + 100).rstrip()
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self.logger.debug("Server: %s", test)
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(x, x, callsign, status, x) = test.split(' ', 4)
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if callsign == "":
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raise LoginError("Server responded with empty callsign???")
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if callsign != self.callsign:
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raise LoginError("Server: %s" % test)
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if status != "verified," and self.passwd != "-1":
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raise LoginError("Password is incorrect")
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if self.passwd == "-1":
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self.logger.info("Login successful (receive only)")
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else:
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self.logger.info("Login successful")
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except LoginError:
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self.close()
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raise
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except:
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self.close()
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raise LoginError("failed to login")
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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 socket.error as e:
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raise ConnectionDrop("connection dropped")
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while True:
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short_buf = ''
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select.select([self.sock], [], [], None if blocking else 0)
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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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raise ConnectionDrop("connection dropped")
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except socket.error as e:
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if "Resource temporarily unavailable" in 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 "\r\n" in self.buf:
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line, self.buf = self.buf.split("\r\n", 1)
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yield line
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