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"""
Test functions in `can.interfaces.socketcan.socketcan`.
"""
import unittest
from unittest.mock import Mock
from unittest.mock import patch
from unittest.mock import call
import ctypes
from can.interfaces.socketcan.socketcan import (
bcm_header_factory,
build_bcm_header,
build_bcm_tx_delete_header,
build_bcm_transmit_header,
build_bcm_update_header,
BcmMsgHead,
)
from can.interfaces.socketcan.constants import (
CAN_BCM_TX_DELETE,
CAN_BCM_TX_SETUP,
SETTIMER,
STARTTIMER,
TX_COUNTEVT,
)
class SocketCANTest(unittest.TestCase):
def setUp(self):
self._ctypes_sizeof = ctypes.sizeof
self._ctypes_alignment = ctypes.alignment
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_32_bit_sizeof_long_4_alignof_long_4(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 32-bit platform (ex. Debian Stretch on i386), where:
* sizeof(long) == 4
* sizeof(long long) == 8
* alignof(long) == 4
* alignof(long long) == 4
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 4,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 4,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_32_bit_sizeof_long_4_alignof_long_long_8(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 32-bit platform (ex. Raspbian Stretch on armv7l), where:
* sizeof(long) == 4
* sizeof(long long) == 8
* alignof(long) == 4
* alignof(long long) == 8
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_64_bit_sizeof_long_8_alignof_long_8(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 64-bit platform (ex. Ubuntu 18.04 on x86_64), where:
* sizeof(long) == 8
* sizeof(long long) == 8
* alignof(long) == 8
* alignof(long long) == 8
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 8,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 8,
ctypes.c_long: 8,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
@unittest.skipIf(
not (
ctypes.sizeof(ctypes.c_long) == 4 and ctypes.alignment(ctypes.c_long) == 4
),
"Should only run on platforms where sizeof(long) == 4 and alignof(long) == 4",
)
def test_build_bcm_header_sizeof_long_4_alignof_long_4(self):
expected_result = b""
expected_result += b"\x02\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x01\x04\x00\x00"
expected_result += b"\x01\x00\x00\x00\x00\x00\x00\x00"
self.assertEqual(
expected_result,
build_bcm_header(
opcode=CAN_BCM_TX_DELETE,
flags=0,
count=0,
ival1_seconds=0,
ival1_usec=0,
ival2_seconds=0,
ival2_usec=0,
can_id=0x401,
nframes=1,
),
)
@unittest.skipIf(
not (
ctypes.sizeof(ctypes.c_long) == 8 and ctypes.alignment(ctypes.c_long) == 8
),
"Should only run on platforms where sizeof(long) == 8 and alignof(long) == 8",
)
def test_build_bcm_header_sizeof_long_8_alignof_long_8(self):
expected_result = b""
expected_result += b"\x02\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x00\x00\x00\x00\x00\x00\x00\x00"
expected_result += b"\x01\x04\x00\x00\x01\x00\x00\x00"
self.assertEqual(
expected_result,
build_bcm_header(
opcode=CAN_BCM_TX_DELETE,
flags=0,
count=0,
ival1_seconds=0,
ival1_usec=0,
ival2_seconds=0,
ival2_usec=0,
can_id=0x401,
nframes=1,
),
)
def test_build_bcm_tx_delete_header(self):
can_id = 0x401
flags = 0
bcm_buffer = build_bcm_tx_delete_header(can_id=can_id, flags=flags)
result = BcmMsgHead.from_buffer_copy(bcm_buffer)
self.assertEqual(CAN_BCM_TX_DELETE, result.opcode)
self.assertEqual(flags, result.flags)
self.assertEqual(0, result.count)
self.assertEqual(0, result.ival1_tv_sec)
self.assertEqual(0, result.ival1_tv_usec)
self.assertEqual(0, result.ival2_tv_sec)
self.assertEqual(0, result.ival2_tv_usec)
self.assertEqual(can_id, result.can_id)
self.assertEqual(1, result.nframes)
def test_build_bcm_transmit_header_initial_period_0(self):
can_id = 0x401
flags = 0
count = 42
bcm_buffer = build_bcm_transmit_header(
can_id=can_id,
count=count,
initial_period=0,
subsequent_period=2,
msg_flags=flags,
)
result = BcmMsgHead.from_buffer_copy(bcm_buffer)
self.assertEqual(CAN_BCM_TX_SETUP, result.opcode)
# SETTIMER and STARTTIMER should be added to the initial flags
self.assertEqual(flags | SETTIMER | STARTTIMER, result.flags)
self.assertEqual(count, result.count)
self.assertEqual(0, result.ival1_tv_sec)
self.assertEqual(0, result.ival1_tv_usec)
self.assertEqual(2, result.ival2_tv_sec)
self.assertEqual(0, result.ival2_tv_usec)
self.assertEqual(can_id, result.can_id)
self.assertEqual(1, result.nframes)
def test_build_bcm_transmit_header_initial_period_1_24(self):
can_id = 0x401
flags = 0
count = 42
bcm_buffer = build_bcm_transmit_header(
can_id=can_id,
count=count,
initial_period=1.24,
subsequent_period=2,
msg_flags=flags,
)
result = BcmMsgHead.from_buffer_copy(bcm_buffer)
self.assertEqual(CAN_BCM_TX_SETUP, result.opcode)
# SETTIMER, STARTTIMER, TX_COUNTEVT should be added to the initial flags
self.assertEqual(flags | SETTIMER | STARTTIMER | TX_COUNTEVT, result.flags)
self.assertEqual(count, result.count)
self.assertEqual(1, result.ival1_tv_sec)
self.assertEqual(240000, result.ival1_tv_usec)
self.assertEqual(2, result.ival2_tv_sec)
self.assertEqual(0, result.ival2_tv_usec)
self.assertEqual(can_id, result.can_id)
self.assertEqual(1, result.nframes)
def test_build_bcm_update_header(self):
can_id = 0x401
flags = 0
bcm_buffer = build_bcm_update_header(can_id=can_id, msg_flags=flags)
result = BcmMsgHead.from_buffer_copy(bcm_buffer)
self.assertEqual(CAN_BCM_TX_SETUP, result.opcode)
self.assertEqual(flags, result.flags)
self.assertEqual(0, result.count)
self.assertEqual(0, result.ival1_tv_sec)
self.assertEqual(0, result.ival1_tv_usec)
self.assertEqual(0, result.ival2_tv_sec)
self.assertEqual(0, result.ival2_tv_usec)
self.assertEqual(can_id, result.can_id)
self.assertEqual(1, result.nframes)
if __name__ == "__main__":
unittest.main()
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