241 lines
8.1 KiB
Python
241 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
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# Part of Odoo, Flectra. See LICENSE file for full copyright and licensing details.
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import logging
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import time
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from os import listdir
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from os.path import join
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try:
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from queue import Queue, Empty
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except ImportError:
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from Queue import Queue, Empty # pylint: disable=deprecated-module
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from select import select
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from threading import Thread, Lock
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from flectra import http
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from flectra.addons.hw_proxy.controllers import main as hw_proxy
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_logger = logging.getLogger(__name__)
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try:
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import evdev
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except ImportError:
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_logger.error('Flectra module hw_scanner depends on the evdev python module')
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evdev = None
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class ScannerDevice():
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def __init__(self, path):
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self.evdev = evdev.InputDevice(path)
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self.evdev.grab()
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self.barcode = []
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self.shift = False
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class Scanner(Thread):
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def __init__(self):
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Thread.__init__(self)
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self.lock = Lock()
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self.status = {'status':'connecting', 'messages':[]}
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self.input_dir = '/dev/input/by-id/'
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self.open_devices = []
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self.barcodes = Queue()
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self.keymap = {
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2: ("1","!"),
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3: ("2","@"),
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4: ("3","#"),
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5: ("4","$"),
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6: ("5","%"),
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7: ("6","^"),
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8: ("7","&"),
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9: ("8","*"),
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10:("9","("),
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11:("0",")"),
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12:("-","_"),
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13:("=","+"),
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# 14 BACKSPACE
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# 15 TAB
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16:("q","Q"),
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17:("w","W"),
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18:("e","E"),
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19:("r","R"),
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20:("t","T"),
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21:("y","Y"),
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22:("u","U"),
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23:("i","I"),
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24:("o","O"),
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25:("p","P"),
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26:("[","{"),
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27:("]","}"),
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# 28 ENTER
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# 29 LEFT_CTRL
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30:("a","A"),
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31:("s","S"),
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32:("d","D"),
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33:("f","F"),
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34:("g","G"),
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35:("h","H"),
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36:("j","J"),
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37:("k","K"),
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38:("l","L"),
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39:(";",":"),
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40:("'","\""),
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41:("`","~"),
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# 42 LEFT SHIFT
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43:("\\","|"),
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44:("z","Z"),
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45:("x","X"),
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46:("c","C"),
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47:("v","V"),
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48:("b","B"),
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49:("n","N"),
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50:("m","M"),
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51:(",","<"),
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52:(".",">"),
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53:("/","?"),
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# 54 RIGHT SHIFT
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57:(" "," "),
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}
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def lockedstart(self):
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with self.lock:
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if not self.isAlive():
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self.daemon = True
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self.start()
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def set_status(self, status, message = None):
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if status == self.status['status']:
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if message != None and message != self.status['messages'][-1]:
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self.status['messages'].append(message)
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else:
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self.status['status'] = status
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if message:
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self.status['messages'] = [message]
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else:
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self.status['messages'] = []
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if status == 'error' and message:
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_logger.error('Barcode Scanner Error: '+message)
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elif status == 'disconnected' and message:
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_logger.info('Disconnected Barcode Scanner: %s', message)
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def get_devices(self):
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try:
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if not evdev:
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return []
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if not isdir(self.input_dir):
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return []
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new_devices = [device for device in listdir(self.input_dir)
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if join(self.input_dir, device) not in [dev.evdev.fn for dev in self.open_devices]]
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scanners = [device for device in new_devices
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if (('kbd' in device) and ('keyboard' not in device.lower()))
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or ('barcode' in device.lower()) or ('scanner' in device.lower())]
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for device in scanners:
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_logger.debug('opening device %s', join(self.input_dir,device))
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self.open_devices.append(ScannerDevice(join(self.input_dir,device)))
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if self.open_devices:
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self.set_status('connected','Connected to '+ str([dev.evdev.name for dev in self.open_devices]))
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else:
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self.set_status('disconnected','Barcode Scanner Not Found')
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return self.open_devices
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except Exception as e:
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self.set_status('error',str(e))
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return []
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def release_device(self, dev):
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self.open_devices.remove(dev)
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def get_barcode(self):
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""" Returns a scanned barcode. Will wait at most 5 seconds to get a barcode, and will
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return barcode scanned in the past if they are not older than 5 seconds and have not
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been returned before. This is necessary to catch barcodes scanned while the POS is
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busy reading another barcode
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"""
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self.lockedstart()
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while True:
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try:
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timestamp, barcode = self.barcodes.get(True, 5)
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if timestamp > time.time() - 5:
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return barcode
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except Empty:
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return ''
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def get_status(self):
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self.lockedstart()
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return self.status
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def _get_open_device_by_fd(self, fd):
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for dev in self.open_devices:
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if dev.evdev.fd == fd:
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return dev
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def run(self):
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""" This will start a loop that catches all keyboard events, parse barcode
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sequences and put them on a timestamped queue that can be consumed by
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the point of sale's requests for barcode events
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"""
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self.barcodes = Queue()
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barcode = []
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shift = False
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devices = None
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while True: # barcodes loop
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devices = self.get_devices()
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try:
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while True: # keycode loop
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r,w,x = select({dev.fd: dev for dev in [d.evdev for d in devices]},[],[],5)
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if len(r) == 0: # timeout
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break
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for fd in r:
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device = self._get_open_device_by_fd(fd)
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if not evdev.util.is_device(device.evdev.fn):
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_logger.info('%s disconnected', str(device.evdev))
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self.release_device(device)
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break
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events = device.evdev.read()
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for event in events:
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if event.type == evdev.ecodes.EV_KEY:
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# _logger.debug('Evdev Keyboard event %s',evdev.categorize(event))
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if event.value == 1: # keydown events
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if event.code in self.keymap:
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if device.shift:
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device.barcode.append(self.keymap[event.code][1])
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else:
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device.barcode.append(self.keymap[event.code][0])
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elif event.code == 42 or event.code == 54: # SHIFT
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device.shift = True
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elif event.code == 28: # ENTER, end of barcode
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_logger.debug('pushing barcode %s from %s', ''.join(device.barcode), str(device.evdev))
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self.barcodes.put( (time.time(),''.join(device.barcode)) )
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device.barcode = []
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elif event.value == 0: #keyup events
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if event.code == 42 or event.code == 54: # LEFT SHIFT
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device.shift = False
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except Exception as e:
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self.set_status('error',str(e))
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scanner_thread = None
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if evdev:
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scanner_thread = Scanner()
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hw_proxy.drivers['scanner'] = scanner_thread
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class ScannerDriver(hw_proxy.Proxy):
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@http.route('/hw_proxy/scanner', type='json', auth='none', cors='*')
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def scanner(self):
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return scanner_thread.get_barcode() if scanner_thread else None
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