106 lines
3.1 KiB
Python
106 lines
3.1 KiB
Python
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# -*- coding: utf-8 -*-
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from struct import pack, unpack
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from socket import socket, AF_INET, SOCK_DGRAM
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from zk import const
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class ZK(object):
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__data_recv = None
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def __init__(self, ip, port=4370, timeout=5):
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self.address = (ip, port)
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self.__address = (ip, port)
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self.__sock = socket(AF_INET, SOCK_DGRAM)
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self.__sock.settimeout(timeout)
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def __create_header(self, command, chksum=0, session_id=0, reply_id=65534, command_string=''):
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'''
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Puts a the parts that make up a packet together and packs them into a byte string
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'''
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buf = pack('HHHH', command, chksum, session_id, reply_id) + command_string
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buf = unpack('8B'+'%sB' % len(command_string), buf)
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chksum = unpack('H', self.__create_checksum(buf))[0]
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reply_id += 1
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if reply_id >= const.USHRT_MAX:
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reply_id -= const.USHRT_MAX
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buf = pack('HHHH', command, chksum, session_id, reply_id)
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return buf + command_string
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def __create_checksum(self, p):
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'''
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Calculates the chksum of the packet to be sent to the time clock
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Copied from zkemsdk.c
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'''
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l = len(p)
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chksum = 0
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while l > 1:
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chksum += unpack('H', pack('BB', p[0], p[1]))[0]
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p = p[2:]
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if chksum > const.USHRT_MAX:
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chksum -= const.USHRT_MAX
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l -= 2
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if l:
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chksum = chksum + p[-1]
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while chksum > const.USHRT_MAX:
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chksum -= const.USHRT_MAX
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chksum = ~chksum
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while chksum < 0:
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chksum += const.USHRT_MAX
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return pack('H', chksum)
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@property
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def __response(self):
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'''
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Checks a returned packet to see if it returned `CMD_ACK_OK` indicating success
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'''
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return unpack('HHHH', self.__data_recv[:8])[0]
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@property
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def __sesion_id(self):
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return unpack('HHHH', self.__data_recv[:8])[2]
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@property
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def __reply_id(self):
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return unpack('HHHH', self.__data_recv[:8])[3]
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def connect(self):
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'''
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connect to device
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'''
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command = const.CMD_CONNECT
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try:
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buf = self.__create_header(command=command)
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self.__sock.sendto(buf, self.address)
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self.__data_recv, addr = self.__sock.recvfrom(1024)
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if self.__response == const.CMD_ACK_OK:
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return (True, self.__response)
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else:
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return (False, self.__response)
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except Exception, e:
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return (False, e)
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def disconnect(self):
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'''
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diconnect from connected device
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'''
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command = const.CMD_EXIT
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try:
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buf = self.__create_header(command=command, session_id=self.__sesion_id, reply_id=self.__reply_id)
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self.__sock.sendto(buf, self.__address)
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self.__data_recv, addr = self.__sock.recvfrom(1024)
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if self.__response == const.CMD_ACK_OK:
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return (True, self.__response)
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else:
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return (False, self.__response)
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except Exception, e:
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return (False, e)
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