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import time
import struct
import logging
try:
import queue
except ImportError:
import Queue as queue
from mdb.utils import compute_checksum, compute_chk, bcd_decode
from mdb.constants import *
from mdb.backend import RaspiBackend, DummyBackend, pigpio
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, app=None):
self.logger = logging.getLogger(type(self).__name__)
self.poll_queue = queue.Queue()
if pigpio:
self.backend = RaspiBackend()
else:
self.logger.warning('Running with dummy backend device')
self.backend = DummyBackend()
def initialize(self):
self.logger.info('Initializing...')
self.backend.open()
# here should IO / connection initizliation go
def run(self):
self.initialize()
while True:
data = self.backend.read()
for b in range(0, len(data), 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 and not self.current_request.processed:
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]))
self.backend.write(msg)
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 []
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)
if self.vend_request(product, value):
# accept. two latter bytes are value subtracted from balance
# displayed after purchase FIXME
return [0x05, 0x00, 0xff]
else:
# welp?
return [0x06]
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):
# Begins new session with balance provided
if amount > 65535:
amount = 65535
self.poll_queue.put([0x03, (amount >> 8) & 0xff, amount & 0xff])
def cancel_session(self):
# Cancels current session
self.poll_queue.put([0x04])
def vend_request(self, product, value):
# Called when user selects a product
return True
#
# 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]
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