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import pytest
from pymodbus.factory import ClientDecoder
from pymodbus.framer.rtu_framer import ModbusRtuFramer
from pymodbus.framer.ascii_framer import ModbusAsciiFramer
from pymodbus.framer.binary_framer import ModbusBinaryFramer
from pymodbus.utilities import ModbusTransactionState
from pymodbus.bit_read_message import ReadCoilsRequest
from pymodbus.exceptions import ModbusIOException
from pymodbus.compat import IS_PYTHON3
if IS_PYTHON3:
from unittest.mock import Mock
else: # Python 2
from mock import Mock
@pytest.fixture
def rtu_framer():
return ModbusRtuFramer(ClientDecoder())
@pytest.fixture
def ascii_framer():
return ModbusAsciiFramer(ClientDecoder())
@pytest.fixture
def binary_framer():
return ModbusBinaryFramer(ClientDecoder())
@pytest.mark.parametrize("framer", [ModbusRtuFramer,
ModbusAsciiFramer,
ModbusBinaryFramer,
])
def test_framer_initialization(framer):
decoder = ClientDecoder()
framer = framer(decoder)
assert framer.client == None
assert framer._buffer == b''
assert framer.decoder == decoder
if isinstance(framer, ModbusAsciiFramer):
assert framer._header == {'lrc': '0000', 'len': 0, 'uid': 0x00}
assert framer._hsize == 0x02
assert framer._start == b':'
assert framer._end == b"\r\n"
elif isinstance(framer, ModbusRtuFramer):
assert framer._header == {'uid': 0x00, 'len': 0, 'crc': '0000'}
assert framer._hsize == 0x01
assert framer._end == b'\x0d\x0a'
assert framer._min_frame_size == 4
else:
assert framer._header == {'crc': 0x0000, 'len': 0, 'uid': 0x00}
assert framer._hsize == 0x01
assert framer._start == b'\x7b'
assert framer._end == b'\x7d'
assert framer._repeat == [b'}'[0], b'{'[0]]
@pytest.mark.parametrize("data", [(b'', {}),
(b'abcd', {'fcode': 98, 'unit': 97})])
def test_decode_data(rtu_framer, data):
data, expected = data
decoded = rtu_framer.decode_data(data)
assert decoded == expected
@pytest.mark.parametrize("data", [(b'', False),
(b'\x02\x01\x01\x00Q\xcc', True)])
def test_check_frame(rtu_framer, data):
data, expected = data
rtu_framer._buffer = data
assert expected == rtu_framer.checkFrame()
@pytest.mark.parametrize("data", [b'', b'abcd'])
def test_advance_framer(rtu_framer, data):
rtu_framer._buffer = data
rtu_framer.advanceFrame()
assert rtu_framer._header == {}
assert rtu_framer._buffer == data
@pytest.mark.parametrize("data", [b'', b'abcd'])
def test_reset_framer(rtu_framer, data):
rtu_framer._buffer = data
rtu_framer.resetFrame()
assert rtu_framer._header == {}
assert rtu_framer._buffer == b''
@pytest.mark.parametrize("data", [(b'', False), (b'abcd', True)])
def test_is_frame_ready(rtu_framer, data):
data, expected = data
rtu_framer._buffer = data
rtu_framer.advanceFrame()
assert rtu_framer.isFrameReady() == expected
def test_populate_header(rtu_framer):
rtu_framer.populateHeader(b'abcd')
assert rtu_framer._header == {'crc': b'd', 'uid': 97, 'len': 5}
def test_add_to_frame(rtu_framer):
assert rtu_framer._buffer == b''
rtu_framer.addToFrame(b'abcd')
assert rtu_framer._buffer == b'abcd'
def test_get_frame(rtu_framer):
rtu_framer.addToFrame(b'\x02\x01\x01\x00Q\xcc')
rtu_framer.populateHeader(b'\x02\x01\x01\x00Q\xcc')
assert rtu_framer.getFrame() == b'\x01\x01\x00'
def test_populate_result(rtu_framer):
rtu_framer._header['uid'] = 255
result = Mock()
rtu_framer.populateResult(result)
assert result.unit_id == 255
def test_process_incoming_packet(rtu_framer):
def cb(res):
return res
def test_build_packet(rtu_framer):
message = ReadCoilsRequest(1, 10)
assert rtu_framer.buildPacket(message) == b'\x00\x01\x00\x01\x00\n\xec\x1c'
def test_send_packet(rtu_framer):
message = b'\x00\x01\x00\x01\x00\n\xec\x1c'
client = Mock()
client.state = ModbusTransactionState.TRANSACTION_COMPLETE
client.silent_interval = 1
client.last_frame_end = 1
client.timeout = 0.25
client.idle_time.return_value = 1
client.send.return_value = len(message)
rtu_framer.client = client
assert rtu_framer.sendPacket(message) == len(message)
client.state = ModbusTransactionState.PROCESSING_REPLY
assert rtu_framer.sendPacket(message) == len(message)
def test_recv_packet(rtu_framer):
message = b'\x00\x01\x00\x01\x00\n\xec\x1c'
client = Mock()
client.recv.return_value = message
rtu_framer.client = client
assert rtu_framer.recvPacket(len(message)) == message
def test_process(rtu_framer):
def cb(res):
return res
rtu_framer._buffer = b'\x00\x01\x00\x01\x00\n\xec\x1c'
with pytest.raises(ModbusIOException):
rtu_framer._process(cb)
def test_get_raw_frame(rtu_framer):
rtu_framer._buffer = b'\x00\x01\x00\x01\x00\n\xec\x1c'
assert rtu_framer.getRawFrame() == rtu_framer._buffer
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