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channel.py
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#!/usr/bin/env python3
from threading import Thread
from atp import encode, decode
import argparse
import sys
import socket
from logging import getLogger
from symmetrical import symmetrical
human_formats = {
'B': 'unsigned char',
'H': 'unsigned short',
'I': 'unsigned int',
'b': 'signed char',
'h': 'signed short',
'i': 'signed int',
'f': 'float',
}
class Channel:
def __init__(self, stream, callback, **kwargs):
self._logger = getLogger("comm.channel")
transmitter = "arm"
follow = False
proto = None
self._symmetrical = False
for arg in kwargs:
if arg == "transmitter":
if kwargs[arg] != None:
transmitter = kwargs[arg]
elif arg == "follow":
if kwargs[arg] != None:
follow = kwargs[arg]
elif arg == "proto":
if kwargs[arg] != None:
proto = kwargs[arg].capitalize()
elif arg == "symmetrical":
if kwargs[arg] != None:
self._symmetrical = kwargs[arg]
else:
self._logger.warning("unexpected '%s' argument" %arg)
self._stream = stream
import protos
self._protos = protos.load()
self._proto = None
self._proto_name = None
if proto:
try:
self._proto = self._protos[proto]
except KeyError:
pass
if not self._proto:
raise Exception("Unknow protocol '%s', " \
"available protocols: %s" \
%(proto, ','.join(self._protos.keys())))
for packet_name in self._proto['packets']:
packet = self._proto['packets'][packet_name]
if packet['transmitter'] == transmitter or packet['transmitter'] == 'both' or transmitter == 'both':
self.__setattr__(packet_name, self._create_method(packet_name, packet))
self._proto_name = proto.lower()
def recv(id, args):
if id == -1:
callback(None, args)
return
if self._proto == None:
if id == 255:
if len(args) != 1:
self._logger.warning("invalid arguments count for id %d" %id)
return
board = args[0]
for proto_name in self._protos:
proto = self._protos[proto_name]
if proto["id"] == board:
self._proto = proto
self._proto_name = proto_name.lower()
self.logger.info("Loading proto '%s'" %proto_name)
recv(id, args)
if self._proto == None:
self._logger.warning("unknow board %d" %board)
else:
self._logger.info("no protocol loaded, can't decode id %d" %id)
else:
know_packet = False
for packet_name in self._proto['packets']:
packet = self._proto['packets'][packet_name]
if packet['id'] == id:
know_packet = True
break
if not know_packet:
self._logger.warning("unknow packet id %d" %id)
return
if packet['transmitter'] == transmitter and packet['transmitter'] != 'both' and transmitter != 'both':
self._logger.info("ignoring %s message" %packet['transmitter'])
return
if len(packet['args']) != len(args) \
and len(packet['args']) + 2 != len(args):
self._logger.warning("packet with id %d expected " \
"%d arguments, %d was given"
%(id, len(packet['args']), len(args)))
return
arguments = dict(zip(packet['args'], args))
if len(args) == len(packet['args']) + 2:
arguments['timestamp'] = args[-2]
arguments['microseconds'] = args[-1]
if self._symmetrical:
symmetrical(self._proto_name, packet_name, arguments)
callback(packet_name, arguments)
thread = decode(stream, recv, follow)
def _create_method(self, name, packet):
def send(*args):
if len(args) == len(packet['args']):
self.send(name, packet, *args)
else:
self._logger.warning("'%s' expects %d arguments, %d given" \
", packet not sended !"
%(name, len(packet['args']), len(args)))
send.__doc__ = '\n'
for arg in packet['args']:
send.__doc__ += "\t%s: %s\n" %(arg, human_formats[packet['args'][arg]])
return send
def send(self, name, packet, *args):
if self._symmetrical:
namedArgs = dict()
names = list(packet['args'])
for i in range(len(args)):
namedArgs[names[i]] = args[i]
symmetrical(self._proto_name, name, namedArgs)
args = list(map(lambda x: namedArgs[x], namedArgs))
formats = list(map(lambda x: packet['args'][x], list(packet['args'])))
encode(self._stream, packet['id'], list(zip(args, formats)))
def print_packet(name, args):
print("[%s]" %name)
for arg in args:
print("\t%s:" %arg, args[arg])
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Decode ATP packets with semantical traduction.')
parser.add_argument("-p", "--proto", dest='proto')
parser.add_argument("-c", "--connect", dest='connect', help="connect to remote host (HOST:PORT)")
parser.add_argument("-t", "--transmitter", dest='transmitter', help="transmitter (arm, pic, both)")
parser.add_argument('-f', '--follow', dest='follow', action='store_true', help='output appended data as the file grows')
parser.add_argument('-i', '--ipython', dest='ipython', action='store_true', help='launch ipython shell (need -c)')
parser.add_argument('-s', '--symmetrical', dest='symmetrical', action='store_true', help='symmetrical packets')
args = parser.parse_args()
stream = sys.stdin.buffer
if args.connect:
try:
host, port = args.connect.split(':')
except ValueError:
print("%s: error: address must be in HOST:PORT format" %sys.argv[0])
sys.exit(1)
try:
port = int(port)
except ValueError:
print("%s: error: PORT must be an positive integer" %sys.argv[0])
sys.exit(1)
try:
sock = socket.socket()
sock.connect((host, port))
except Exception as e:
print("%s:" %sys.argv[0], e)
sys.exit(1)
file = sock.makefile(mode="rw")
stream = file.buffer
if args.connect and args.ipython:
callback = lambda x, y: None
else:
callback = print_packet
channel = Channel(stream, callback, proto = args.proto,
transmitter = args.transmitter, follow = args.follow,
symmetrical = args.symmetrical)
if args.connect and args.ipython:
from IPython import embed
embed()