scanner.py

import pyudev as pd
import sys
import requests
import json
import ConfigParser
import time
import daemon
import signal
import datetime
# from spam import do_main_program

logfile = open('/var/log/pyscanner.log', 'a')
import sys
sys.stdout = logfile

def receiveSignal(signalNumber, frame):
	print('Received:', signalNumber)
	logfile.close()
	quit()
	return

signal.signal(signal.SIGTERM, receiveSignal)


api_key = "cmqkjdqmdkqsdkml"
service_url = "https://liina.irtsnouvelleaquitaine.fr/barcode/api"


# 
## configParser = ConfigParser.RawConfigParser()   
## configFilePath = r'/etc/'
## configParser.read(configFilePath)

location='/dev/hidraw1' ## None

context = pd.Context()

while (location == None):
	for device in context.list_devices(subsystem='hidraw'):
		if ('{0}'.format(device.find_parent('hid'))).find('0003:1D82:5CA0') != -1:
			print device.device_node
			location = device.device_node
	if (location == None):
		time.sleep(1)


def barcode_reader():
    """Barcode code obtained from 'brechmos' 
    https://www.raspberrypi.org/forums/viewtopic.php?f=45&t=55100"""
    hid = {4: 'a', 5: 'b', 6: 'c', 7: 'd', 8: 'e', 9: 'f', 10: 'g', 11: 'h', 12: 'i', 13: 'j', 14: 'k', 15: 'l', 16: 'm',
           17: 'n', 18: 'o', 19: 'p', 20: 'q', 21: 'r', 22: 's', 23: 't', 24: 'u', 25: 'v', 26: 'w', 27: 'x', 28: 'y',
           29: 'z', 30: '1', 31: '2', 32: '3', 33: '4', 34: '5', 35: '6', 36: '7', 37: '8', 38: '9', 39: '0', 44: ' ',
           45: '-', 46: '=', 47: '[', 48: ']', 49: '\\', 51: ';', 52: '\'', 53: '~', 54: ',', 55: '.', 56: '/'}

    hid2 = {4: 'A', 5: 'B', 6: 'C', 7: 'D', 8: 'E', 9: 'F', 10: 'G', 11: 'H', 12: 'I', 13: 'J', 14: 'K', 15: 'L', 16: 'M',
            17: 'N', 18: 'O', 19: 'P', 20: 'Q', 21: 'R', 22: 'S', 23: 'T', 24: 'U', 25: 'V', 26: 'W', 27: 'X', 28: 'Y',
            29: 'Z', 30: '!', 31: '@', 32: '#', 33: '$', 34: '%', 35: '^', 36: '&', 37: '*', 38: '(', 39: ')', 44: ' ',
            45: '_', 46: '+', 47: '{', 48: '}', 49: '|', 51: ':', 52: '"', 53: '~', 54: '<', 55: '>', 56: '?'}

    fp = open(location, 'rb')
    ss = ""
    shift = False

    done = False

    while not done:

        ## Get the character from the HID
        buffer = fp.read(8)
        for c in buffer:
            if ord(c) > 0:

                ##  40 is carriage return which signifies
                ##  we are done looking for characters
                if int(ord(c)) == 40:
                    done = True
                    break;

                ##  If we are shifted then we have to
                ##  use the hid2 characters.
                if shift:

                    ## If it is a '2' then it is the shift key
                    if int(ord(c)) == 2:
                        shift = True

                    ## if not a 2 then lookup the mapping
                    else:
                        ss += hid2[int(ord(c))]
                        shift = False

                ##  If we are not shifted then use
                ##  the hid characters

                else:

                    ## If it is a '2' then it is the shift key
                    if int(ord(c)) == 2:
                        shift = True

                    ## if not a 2 then lookup the mapping
                    else:
                        ss += hid[int(ord(c))]
    print(ss)
    return ss

def send_scan(barcode):
	print("%s : %s " % (datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'),  barcode )) 
	post_data= {
		'key' : api_key,
		'action': 'EmargementBiQuotidien',
		'barcode' : barcode
	}
	try:
		response = requests.post(service_url,post_data)
#		print("-----" * 5)
#		print(barcode)
		print(response.text)
		
	except Exception as e:
		print('error')
		print e
	logfile.flush()

def main():
	print "Start scanner"
	while True:
		try:
			send_scan(barcode_reader())
		except Exception as e:
			print('error')
			print e

# with daemon.DaemonContext(stdout = logfile, stderr = logfile):
#    main()


if __name__ == "__main__":
    main()