def test_cache_invalidate(self):
""" Test the cache invalidation. """
state = {'count': 0}
def read(_):
""" Read dummy. """
if state['count'] == 0:
state['count'] = 1
return {'data': bytearray([255] * 256)}
elif state['count'] == 1:
state['count'] = 2
return {'data': bytearray([255] * 256)}
else:
raise Exception('Too many reads !')
SetUpTestInjections(master_communicator=MasterCommunicator(read))
eeprom_file = EepromFile()
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
# Second read should come from cache.
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
eeprom_file.invalidate_cache()
# Should be read from communicator, since cache is invalid
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
self.assertEqual(2, state['count'])
def get_module_addresses(module_type):
# type: (str) -> List[str]
"""
Get the addresses for the modules of the given type.
:param module_type: the type of the module (O, R, D, I, T, C)
:returns: A list containing the addresses of the modules (strings of length 4).
"""
eeprom_file = EepromFile()
base_address = EepromAddress(0, 1, 2)
no_modules = eeprom_file.read([base_address])
modules = []
no_input_modules = no_modules[base_address].bytes[0]
for i in range(no_input_modules):
address = EepromAddress(2 + i, 252, 1)
is_can = chr(eeprom_file.read([address])[address].bytes[0]) == 'C'
address = EepromAddress(2 + i, 0, 4)
module = eeprom_file.read([address])[address].bytes
if not is_can or chr(module[0]) == 'C':
modules.append(module)
no_output_modules = no_modules[base_address].bytes[1]
for i in range(no_output_modules):
address = EepromAddress(33 + i, 0, 4)
modules.append(eeprom_file.read([address])[address].bytes)
return [module for module in modules if chr(module[0]) == module_type]
def test_read_multiple_banks(self):
""" Test read from multiple banks. """
def read(_data):
""" Read dummy. """
if _data['bank'] == 1:
return {'data': bytearray(b'abc') + bytearray([255] * 200) + bytearray(b'def') + bytearray([255] * 48)}
if _data['bank'] == 100:
return {'data': bytearray(b'hello') + bytearray([0] * 100) + bytearray(b'world') + bytearray([0] * 146)}
else:
raise Exception('Wrong page')
SetUpTestInjections(master_communicator=MasterCommunicator(read))
eeprom_file = EepromFile()
address1 = EepromAddress(1, 2, 10)
address2 = EepromAddress(100, 4, 10)
address3 = EepromAddress(100, 105, 5)
data = eeprom_file.read([address1, address2, address3])
self.assertEqual(3, len(data))
self.assertEqual(address1, data[address1].address)
self.assertEqual(bytearray(b'c') + bytearray([255] * 9), data[address1].bytes)
self.assertEqual(address2, data[address2].address)
self.assertEqual(bytearray(b'o') + bytearray([0] * 9), data[address2].bytes)
self.assertEqual(address3, data[address3].address)
self.assertEqual(bytearray(b'world'), data[address3].bytes)
def test_read_one_bank_two_addresses(self):
""" Test read from one bank with two addresses. """
def read(_data):
""" Read dummy """
if _data['bank'] == 1:
return {
'data':
bytearray(b'abc') + bytearray([255] * 200) +
bytearray(b'def') + bytearray([255] * 48)
}
else:
raise Exception('Wrong page')
SetUpTestInjections(master_communicator=MasterCommunicator(read))
eeprom_file = EepromFile()
address1 = EepromAddress(1, 2, 10)
address2 = EepromAddress(1, 203, 4)
data = eeprom_file.read([address1, address2])
self.assertEqual(2, len(data))
self.assertEqual(address1, data[address1].address)
self.assertEqual(
bytearray(b'c') + bytearray([255] * 9), data[address1].bytes)
self.assertEqual(address2, data[address2].address)
self.assertEqual(bytearray(b'def\xff'), data[address2].bytes)
def test_cache_write(self):
""" Test the eeprom cache on writing. """
state = {'read': 0, 'write': 0}
def read(_):
""" Read dummy. """
if state['read'] == 0:
state['read'] = 1
return {'data': bytearray([255] * 256)}
else:
raise Exception('Too many reads !')
def write(data):
""" Write dummy. """
if state['write'] == 0:
self.assertEqual(1, data['bank'])
self.assertEqual(100, data['address'])
self.assertEqual(bytearray([0] * 10), data['data'])
state['write'] = 1
elif state['write'] == 1:
self.assertEqual(1, data['bank'])
self.assertEqual(110, data['address'])
self.assertEqual(bytearray([0] * 10), data['data'])
state['write'] = 2
else:
raise Exception('Too many writes !')
SetUpTestInjections(
master_communicator=MasterCommunicator(read, write))
eeprom_file = EepromFile()
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
eeprom_file.write(
[EepromData(EepromAddress(1, 100, 20), bytearray([0] * 20))])
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 100 + [0] * 20 + [255] * 136),
read[address].bytes)
self.assertEqual(1, state['read'])
self.assertEqual(2, state['write'])
def test_cache_write_exception(self):
""" The cache should be invalidated if a write fails. """
state = {'read': 0, 'write': 0}
def read(_):
""" Read dummy. """
if state['read'] == 0:
state['read'] = 1
return {'data': bytearray([255] * 256)}
elif state['read'] == 1:
state['read'] = 2
return {'data': bytearray([255] * 256)}
else:
raise Exception('Too many reads !')
def write(_):
""" Write dummy. """
state['write'] += 1
raise Exception('write fails...')
SetUpTestInjections(
master_communicator=MasterCommunicator(read, write))
eeprom_file = EepromFile()
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
try:
eeprom_file.write(
[EepromData(EepromAddress(1, 100, 20), bytearray([0] * 20))])
self.fail('Should not get here !')
except Exception:
pass
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
self.assertEqual(2, state['read'])
self.assertEqual(1, state['write'])
def test_cache(self):
""" Test the caching of banks. """
state = {'count': 0}
def read(_):
""" Read dummy. """
if state['count'] == 0:
state['count'] = 1
return {'data': bytearray([255] * 256)}
else:
raise Exception('Too many reads !')
SetUpTestInjections(master_communicator=MasterCommunicator(read))
eeprom_file = EepromFile()
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
# Second read should come from cache, if read is called
# an exception will be thrown.
address = EepromAddress(1, 0, 256)
read = eeprom_file.read([address])
self.assertEqual(bytearray([255] * 256), read[address].bytes)
def test_read_one_bank_one_address(self):
""" Test read from one bank with one address """
def read(_data):
""" Read dummy. """
if _data['bank'] == 1:
return {'data': bytearray(b'abc') + bytearray([255] * 200) + bytearray(b'def') + bytearray([255] * 48)}
else:
raise Exception('Wrong page')
SetUpTestInjections(master_communicator=MasterCommunicator(read))
eeprom_file = EepromFile()
address = EepromAddress(1, 0, 3)
data = eeprom_file.read([address])
self.assertEqual(1, len(data))
self.assertEqual(address, data[address].address)
self.assertEqual(bytearray(b'abc'), data[address].bytes)