1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.
import logging
import time
from os import listdir
from os.path import join, isdir
try:
from queue import Queue, Empty
except ImportError:
from Queue import Queue, Empty # pylint: disable=deprecated-module
from select import select
from threading import Thread, Lock
from odoo import http
from odoo.addons.hw_proxy.controllers import main as hw_proxy
_logger = logging.getLogger(__name__)
try:
import evdev
except ImportError:
_logger.error('Odoo module hw_scanner depends on the evdev python module')
evdev = None
class ScannerDevice():
def __init__(self, path):
self.evdev = evdev.InputDevice(path)
self.evdev.grab()
self.barcode = []
self.shift = False
class Scanner(Thread):
def __init__(self):
Thread.__init__(self)
self.lock = Lock()
self.status = {'status':'connecting', 'messages':[]}
self.input_dir = '/dev/input/by-id/'
self.open_devices = []
self.barcodes = Queue()
self.keymap = {
2: ("1","!"),
3: ("2","@"),
4: ("3","#"),
5: ("4","$"),
6: ("5","%"),
7: ("6","^"),
8: ("7","&"),
9: ("8","*"),
10:("9","("),
11:("0",")"),
12:("-","_"),
13:("=","+"),
# 14 BACKSPACE
# 15 TAB
16:("q","Q"),
17:("w","W"),
18:("e","E"),
19:("r","R"),
20:("t","T"),
21:("y","Y"),
22:("u","U"),
23:("i","I"),
24:("o","O"),
25:("p","P"),
26:("[","{"),
27:("]","}"),
# 28 ENTER
# 29 LEFT_CTRL
30:("a","A"),
31:("s","S"),
32:("d","D"),
33:("f","F"),
34:("g","G"),
35:("h","H"),
36:("j","J"),
37:("k","K"),
38:("l","L"),
39:(";",":"),
40:("'","\""),
41:("`","~"),
# 42 LEFT SHIFT
43:("\\","|"),
44:("z","Z"),
45:("x","X"),
46:("c","C"),
47:("v","V"),
48:("b","B"),
49:("n","N"),
50:("m","M"),
51:(",","<"),
52:(".",">"),
53:("/","?"),
# 54 RIGHT SHIFT
57:(" "," "),
}
def lockedstart(self):
with self.lock:
if not self.isAlive():
self.daemon = True
self.start()
def set_status(self, status, message = None):
if status == self.status['status']:
if message != None and message != self.status['messages'][-1]:
self.status['messages'].append(message)
else:
self.status['status'] = status
if message:
self.status['messages'] = [message]
else:
self.status['messages'] = []
if status == 'error' and message:
_logger.error('Barcode Scanner Error: '+message)
elif status == 'disconnected' and message:
_logger.info('Disconnected Barcode Scanner: %s', message)
def get_devices(self):
try:
if not evdev:
return []
if not isdir(self.input_dir):
return []
new_devices = [device for device in listdir(self.input_dir)
if join(self.input_dir, device) not in [dev.evdev.fn for dev in self.open_devices]]
scanners = [device for device in new_devices
if (('kbd' in device) and ('keyboard' not in device.lower()))
or ('barcode' in device.lower()) or ('scanner' in device.lower())]
for device in scanners:
_logger.debug('opening device %s', join(self.input_dir,device))
self.open_devices.append(ScannerDevice(join(self.input_dir,device)))
if self.open_devices:
self.set_status('connected','Connected to '+ str([dev.evdev.name for dev in self.open_devices]))
else:
self.set_status('disconnected','Barcode Scanner Not Found')
return self.open_devices
except Exception as e:
self.set_status('error',str(e))
return []
def release_device(self, dev):
self.open_devices.remove(dev)
def get_barcode(self):
""" Returns a scanned barcode. Will wait at most 5 seconds to get a barcode, and will
return barcode scanned in the past if they are not older than 5 seconds and have not
been returned before. This is necessary to catch barcodes scanned while the POS is
busy reading another barcode
"""
self.lockedstart()
while True:
try:
timestamp, barcode = self.barcodes.get(True, 5)
if timestamp > time.time() - 5:
return barcode
except Empty:
return ''
def get_status(self):
self.lockedstart()
return self.status
def _get_open_device_by_fd(self, fd):
for dev in self.open_devices:
if dev.evdev.fd == fd:
return dev
def run(self):
""" This will start a loop that catches all keyboard events, parse barcode
sequences and put them on a timestamped queue that can be consumed by
the point of sale's requests for barcode events
"""
self.barcodes = Queue()
barcode = []
shift = False
devices = None
while True: # barcodes loop
devices = self.get_devices()
try:
while True: # keycode loop
r,w,x = select({dev.fd: dev for dev in [d.evdev for d in devices]},[],[],5)
if len(r) == 0: # timeout
break
for fd in r:
device = self._get_open_device_by_fd(fd)
if not evdev.util.is_device(device.evdev.fn):
_logger.info('%s disconnected', str(device.evdev))
self.release_device(device)
break
events = device.evdev.read()
for event in events:
if event.type == evdev.ecodes.EV_KEY:
# _logger.debug('Evdev Keyboard event %s',evdev.categorize(event))
if event.value == 1: # keydown events
if event.code in self.keymap:
if device.shift:
device.barcode.append(self.keymap[event.code][1])
else:
device.barcode.append(self.keymap[event.code][0])
elif event.code == 42 or event.code == 54: # SHIFT
device.shift = True
elif event.code == 28: # ENTER, end of barcode
_logger.debug('pushing barcode %s from %s', ''.join(device.barcode), str(device.evdev))
self.barcodes.put( (time.time(),''.join(device.barcode)) )
device.barcode = []
elif event.value == 0: #keyup events
if event.code == 42 or event.code == 54: # LEFT SHIFT
device.shift = False
except Exception as e:
self.set_status('error',str(e))
scanner_thread = None
if evdev:
scanner_thread = Scanner()
hw_proxy.drivers['scanner'] = scanner_thread
class ScannerDriver(hw_proxy.Proxy):
@http.route('/hw_proxy/scanner', type='json', auth='none', cors='*')
def scanner(self):
return scanner_thread.get_barcode() if scanner_thread else None
|
