summaryrefslogtreecommitdiffstats
path: root/bitvend.py
blob: 5470679cd6072eb96cc0249c832cc49527edbe90 (plain)
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
import time
import struct
import logging
import threading
import flask
import cachetools
import requests

try:
    import queue
except ImportError:
    import Queue as queue

from functools import reduce

logging.basicConfig(level=logging.INFO)

#from prometheus_client import start_http_server, Counter
#start_http_server(8000)

#coin_counter = Counter('coins_inserted', 'Number of coins inserted into machine')
#purchase_counter = Counter('purchases', 'Number of purchases')

RX_PIN = 4
TX_PIN = 17

CASHLESS_RESET = 0x10
CASHLESS_SETUP = 0x11
CASHLESS_POLL = 0x12
CASHLESS_VEND = 0x13
CASHLESS_READER = 0x14
CASHLESS_REVALUE = 0x15

CASHLESS_EXP = 0x17
CASHLESS_EXP_ID = 0x00
CASHLESS_EXP_READ = 0x01
CASHLESS_EXP_WRITE = 0x02
CASHLESS_EXP_WRITE_TIME = 0x03
CASHLESS_EXP_FEATURE_ENABLE = 0x04

BILL_RESET = 0x30
BILL_SETUP = 0x31
BILL_POLL = 0x33
BILL_TYPE = 0x34
BILL_STACKER = 0x36
BILL_EXP = 0x37
BILL_EXP_ID = 0x00

# Page 26 - peripheral addresses
try:
    import pigpio

    pi = pigpio.pi()
    pi.wave_clear()
    pi.set_mode(TX_PIN, pigpio.INPUT)

    try:
        pi.bb_serial_read_close(RX_PIN)
    except:
        pass

    status = pi.bb_serial_read_open(RX_PIN, 9600, 9)

    if status != 0:
        logging.error('Open failed: %d', status)
        exit(1)
except:
    pass


def compute_chk(data):
    return reduce(lambda a, b: (a+b)%256, data, 0)

def compute_checksum(cmd, data):
    return compute_chk(bytearray([cmd]) + data)

def bcd_decode(b):
    return 10 * ((b & 0xf0) >> 4) + (b & 0x0f)

@cachetools.cached(cachetools.TTLCache(32, 600))
def get_exchange_rate(currency='PLN'):
    return requests.get('https://blockchain.info/pl/ticker').json()[currency]['last']

def to_local_currency(sat):
    # Returns satoshi in local lowest denomination currency (grosze)
    rate = get_exchange_rate()
    return int(sat / 1000000.0 * rate)

def from_local_currency(val):
    rate = get_exchange_rate()
    return int(val / rate * 1000000)

def sat_to_btc(amount):
    return amount / 100000000.0

def format_btc(amount):
    return (u'฿%.8f' % (sat_to_btc(amount),)).rstrip('0').rstrip('.')

class MDBRequest(object):
    timestamp = None
    data = None
    command = None
    processed = False

    def __init__(self, command):
        self.timestamp = time.time()
        self.command = command
        self.data = bytearray()

    def validate_checksum(self):
        if not self.data:
            return False

        try:
            if self.ack:
                if len(self.data) == 1 and self.processed:
                    return True # Only ACK

                return self.data[-2] == compute_checksum(self.command, self.data[:-2])
            else:
                return self.data[-1] == compute_checksum(self.command, self.data[:-1])
        except KeyboardInterrupt:
            raise
        except:
            logging.exception('Checksum validation failed for: %r %r', self.command, self.data)
            return False
    @property
    def ack(self):
        return self.data[-1] == 0x00

    def __repr__(self):
        return '<MDBRequest 0x%02x [%s] chk:%r>' % (
            self.command,
            ' '.join(['0x%02x' % b for b in self.data]),
            self.validate_checksum()
            )

class MDBDevice(object):
    current_request = None
    send_buffer = None

    def __init__(self):
        self.logger = logging.getLogger(type(self).__name__)
        self.poll_queue = queue.Queue()

    def initialize(self):
        self.logger.info('Initializing...')
        # here should IO / connection initizliation go

    def run(self):
        self.initialize()

        while True:
            cnt, data = pi.bb_serial_read(RX_PIN)
            for b in range(0, cnt, 2):
                if data[b+1]:
                    if self.current_request: # and not self.current_request.processed:
                        self.logger.debug(self.current_request)
                        if self.current_request.processed and self.current_request.ack:
                            self.logger.info('Got response: %d',self.current_request.data[-1])

                    self.current_request = MDBRequest(data[b])
                    self.send_buffer = None
                elif self.current_request:
                    if self.current_request.processed and data[b] == 0xaa and self.send_buffer:
                        self.logger.warning('Received RETRANSMIT %r %r', self.current_request, self.send_buffer)
                        #self.send(self.send_buffer, checksum=False)
                    else:
                        self.current_request.data.append(data[b])
                else:
                    self.logger.warning('Received unexpected data: 0x%02x', data[b])

                if self.current_request and not self.current_request.processed:
                    try:
                        resp = self.process_request(self.current_request)

                        if resp is not None:
                            self.current_request.processed = True
                            self.send(resp)
                    except KeyboardInterrupt:
                        raise
                    except:
                        self.logger.exception('Request process failed!')

    def send(self, data, checksum=True):
        data = list(data)
        if checksum:
            data.append(0x100 | compute_chk(data))

        msg = struct.pack('<%dh' % len(data), *data)

        self.send_buffer = data

        self.logger.debug('>> [%d bytes] %s', len(data), ' '.join(['0x%02x' % b for b in data]))

        pi.wave_clear()
        pi.wave_add_serial(TX_PIN, 9600, msg, bb_bits=9, bb_stop=6)
        wid = pi.wave_create()

        pi.set_mode(TX_PIN, pigpio.OUTPUT)
        pi.wave_send_once(wid)   # transmit serial data

        while pi.wave_tx_busy(): # wait until all data sent
            pass

        pi.wave_delete(wid)
        pi.set_mode(TX_PIN, pigpio.INPUT)

    def process_request(self, req):
        # Unimplemented...
        return

#
# This is mostly working cashless device implementation
#

class CashlessMDBDevice(MDBDevice):
    base_address = CASHLESS_RESET
    state = 'IDLE'

    config_data = [
        0x01, # Feature level
        0x19, 0x85, # PLN x---DD
        1, # scaling factor
        0x00, # decimal places factor
        10, # 10s response time
        0x00, # misc options...
        ]

    manufacturer = 'GMD'
    serial_number = '123456789012'
    model_number = '123456789012'
    software_version = (0x21, 0x37)

    def process_request(self, req):
        if (req.command & self.base_address) != self.base_address:
            # Target mismatch
            return

        if not req.validate_checksum():
            # Invalid checksum
            return

        if req.command == CASHLESS_RESET:
            self.state = 'RESET'
            self.logger.info('RESET: Device reset')
            self.poll_queue.put([0x00])

            return []

        elif req.command == CASHLESS_POLL:
            try:
                msg = self.poll_queue.get_nowait()
                self.logger.info('Sending POLL response: %r', msg)
                return msg
            except queue.Empty:
                return []

            #if self.state == 'RESET':
            #    self.state = 'IDLE'
            #    self.logger.info('POLL: Sending JUST RESET')
            #    return [0b00] # validator was reset
            #elif self.state == 'IDLE':
            #    self.state = 'SESSION'
            #    self.logger.info('POLL: starting session')
            #    return [0x03, 0xff, 0xff] # goes up to 65535 x---DD
            #else:
            #    return []
            #    #return([0x02, 10, ord('J'), ord('P'), ord('P')] + [ord('X')] * (32-3))

        elif req.command == CASHLESS_VEND:
            if req.data[0] == 0x00: # vend request
                self.logger.info('VEND: request %r', req)
                value, product_bcd = struct.unpack('>xhhx', req.data)
                product = bcd_decode(product_bcd)
                self.logger.info('VEND: requested %d for %d', product, value)
                # accept. two latter bytes are value subtracted from balance
                # displayed after purchase
                return [0x05, 0x00, 0xff]

            elif req.data[0] == 0x01: # vend cancel
                self.logger.info('VEND: cancel')
                return [0x06] # deny == ok

            elif req.data[0] == 0x02: # vend succ
                self.logger.info('VEND: success %r', req)
                return []

            elif req.data[0] == 0x03:
                self.logger.info('VEND: failure')
                return []

            elif req.data[0] == 0x04:
                self.logger.info('VEND: session complete %r', req)
                self.state = 'IDLE'
                return [0x07]

            elif req.data[0] == 0x05:
                self.logger.info('VEND: cash sale')
                return []

            elif req.data[0] == 0x06:
                self.logger.info('VEND: negative vend request')
                return [0x06] # deny
            else:
                self.logger.warning('VEND: unknown command %r', req)

        elif req.command == CASHLESS_EXP and req.data[0] == CASHLESS_EXP_ID:
            self.logger.info('EXP_ID request')
            return (
                bytearray([0x09]) + # peripheral ID
                bytearray(self.manufacturer.rjust(3, ' ').encode('ascii')) +
                bytearray(self.serial_number.rjust(12, '0').encode('ascii')) +
                bytearray(self.model_number.rjust(12, '0').encode('ascii')) +
                bytearray(self.software_version)
                )

        elif req.command == CASHLESS_SETUP and req.data[0] == 0x00 and len(req.data) == 6:
            vmc_level, disp_cols, disp_rows, disp_info = req.data[1:-1]

            self.logger.info('SETUP config')
            self.logger.info('  -> VMC level: %d', vmc_level)
            self.logger.info('  -> Disp cols: %d', disp_cols)
            self.logger.info('  -> Disp rows: %d', disp_rows)
            self.logger.info('  -> Disp info: %d', disp_info)

            self.state = 'IDLE'

            return [0x01] + self.config_data

        elif req.command == CASHLESS_SETUP and req.data[0] == 0x01:
            self.logger.info('SETUP max/min price: %r', req)
            return []

        elif req.command == CASHLESS_READER:
            self.logger.info('READER update: %r', req.data[0])
            return []

    def begin_session(self, amount):
        if amount > 65535:
            amount = 65535

        self.poll_queue.put([0x03, (amount >> 8) & 0xff, amount & 0xff])

    def cancel_session(self):
        self.poll_queue.put([0x04])

#
# This is mostly unfinished Bill validator implementation
#

class BillMDBDevice(MDBDevice):
    scaling_factor = 50

    bills = [
        50, 100, 200, 500, 1000, 2000, 5000, 10000,
        0, 0, 0, 0, 0, 0, 0, 0,
        ]

    feed_bills = []

    def feed_amount(self, amount):
        if amount % self.scaling_factor:
            raise Exception('Invalid amount')

        while amount > 0:
            bills_list = filter(lambda v: v <= amount, self.bills)
            bills_list.sort()

            self.feed_bills.append(self.bills.index(bills_list[-1]))
            amount -= bills_list[-1]

dev = CashlessMDBDevice()

app = flask.Flask(__name__)

app.config['TEMPLATES_AUTO_RELOAD'] = True

@app.route('/')
def index():
    return flask.render_template(
        'index.html', items=[
            {
                'name': 'Club Mate',
                'image': 'http://scrummy.pl/2766-thickbox_default/club-mate.jpg',
                'value': 500,
            },
            {
                'name': 'Arduino Pro Micro',
                'image': 'https://hackerspace.pl/~informatic/dropbox/1d59bf26f1352da558f249d815db6376.png',
                'value': 0,
            }
        ])

@app.route('/begin/<int:amount>')
def begin_session(amount):
    dev.begin_session(amount)
    return 'ok'

@app.route('/cancel')
def cancel_session():
    dev.cancel_session();
    return 'ok'

@app.context_processor
def ctx_utils():
    return {
        'from_local_currency': from_local_currency,
        'to_local_currency': to_local_currency,
        'format_btc': format_btc,
    }

if __name__ == "__main__":
    app.run()
    #threading.Thread(target=app.run, kwargs={'host': '0.0.0.0'}, daemon=True).start()
    #dev.run()