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test_testserver_ex_structs.py
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test_testserver_ex_structs.py
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import ctypes
import struct
import unittest
import datetime
import pyads
from pyads.testserver_ex import structs
from pyads.structs import AmsAddr
from pyads.filetimes import dt_to_filetime, filetime_to_dt
class TestserverExStructsTestCase(unittest.TestCase):
def setUp(self):
pass
def tearDown(self):
pass
def test_amstcpheader(self):
# test for empty data
x = structs.AmsTcpHeader()
self.assertEqual(b"\x00" * 6, x.to_bytes())
self.assertEqual(0, x.length)
# check for correct unpacking
x = structs.AmsTcpHeader.from_bytes(b"\x00\x00\x1f\x00\x00\x00")
# check for correct packing
x.length = 255
self.assertEqual(b"\x00\x00\xff\x00\x00\x00", x.to_bytes())
def test_amsheader(self):
source_addr = AmsAddr("127.0.0.1.1.1", 59558)
target_addr = AmsAddr("172.38.1.1.1.1", 59559)
header1 = structs.AmsHeader(
target_net_id=target_addr.netIdStruct(),
target_port=target_addr.port,
source_net_id=source_addr.netIdStruct(),
source_port=source_addr.port,
command_id=pyads.constants.ADSCOMMAND_READDEVICEINFO,
state_flags=pyads.constants.ADSSTATEFLAG_COMMAND,
data_length=6,
error_code=1,
invoke_id=2,
)
data_bytes = header1.to_bytes()
self.assertEqual(len(data_bytes), header1.length)
header2 = structs.AmsHeader.from_bytes(data_bytes)
self.assertEqual(
bytearray(header1.target_net_id.b), bytearray(header2.target_net_id.b)
)
self.assertEqual(header1.target_port, header2.target_port)
self.assertEqual(
bytearray(header1.source_net_id), bytearray(header2.source_net_id)
)
self.assertEqual(header1.source_port, header2.source_port)
self.assertEqual(header1.command_id, header2.command_id)
self.assertEqual(header1.state_flags, header2.state_flags)
self.assertEqual(header1.data_length, header2.data_length)
self.assertEqual(header1.error_code, header2.error_code)
self.assertEqual(header1.invoke_id, header2.invoke_id)
def test_ams_packet(self):
source_addr = AmsAddr("127.0.0.1.1.1", 59558)
target_addr = AmsAddr("172.38.1.1.1.1", 59559)
header1 = structs.AmsHeader(
target_net_id=target_addr.netIdStruct(),
target_port=target_addr.port,
source_net_id=source_addr.netIdStruct(),
source_port=source_addr.port,
command_id=pyads.constants.ADSCOMMAND_READDEVICEINFO,
state_flags=pyads.constants.ADSSTATEFLAG_COMMAND,
data_length=6,
error_code=1,
invoke_id=2,
)
ads_data = b"\x00" * 6
amstcpheader = structs.AmsTcpHeader(header1.length + len(ads_data))
packet = structs.AmsPacket(amstcpheader, header1, ads_data)
# first six bytes should be amstcpheader
self.assertEqual(packet.to_bytes()[:6], amstcpheader.to_bytes())
# next 32 bytes should be ams header
self.assertEqual(packet.to_bytes()[6:38], header1.to_bytes())
# last bytes should be data
self.assertEqual(packet.to_bytes()[38:44], ads_data)
# check from bytes function
self.assertEqual(
structs.AmsPacket.from_bytes(packet.to_bytes()).to_bytes(),
packet.to_bytes(),
)
def test_ads_notification_sample(self):
sample = structs.AdsNotificationSample(
handle=1,
sample_size=ctypes.sizeof(pyads.PLCTYPE_INT),
data=struct.pack("<H", 12),
)
self.assertEqual(
b"\x01\x00\x00\x00" # handle
b"\x02\x00\x00\x00" # sample_size
b"\x0C\x00", # data
sample.to_bytes(),
)
self.assertEqual(sample.length, 10)
def test_ads_stamp_header(self):
dt = datetime.datetime(2017, 9, 1, 10, 10, 10)
filetime = dt_to_filetime(dt)
stamp_header = structs.AdsStampHeader(
timestamp=filetime,
samples=[
structs.AdsNotificationSample(
handle=1,
sample_size=ctypes.sizeof(pyads.PLCTYPE_INT),
data=struct.pack("<H", 12),
)
],
)
self.assertEqual(
b"\x00\xadT~\n#\xd3\x01" # timestamp
b"\x01\x00\x00\x00" # sample count
b"\x01\x00\x00\x00" # sample handle
b"\x02\x00\x00\x00" # sample sample_size
b"\x0C\x00", # sample data
stamp_header.to_bytes(),
)
self.assertEqual(stamp_header.length, 22)
def test_ads_notification_stream(self):
dt = datetime.datetime(2017, 9, 1, 10, 10, 10)
filetime = dt_to_filetime(dt)
stream = structs.AdsNotificationStream(
[
structs.AdsStampHeader(
timestamp=filetime,
samples=[
structs.AdsNotificationSample(
handle=1,
sample_size=ctypes.sizeof(pyads.PLCTYPE_INT),
data=struct.pack("<H", 12),
)
],
)
]
)
self.assertEqual(
b"\x16\x00\x00\x00" # length
b"\x01\x00\x00\x00" # stamp count
b"\x00\xadT~\n#\xd3\x01" # stamp timestamp
b"\x01\x00\x00\x00" # stamp sample count
b"\x01\x00\x00\x00" # sample handle
b"\x02\x00\x00\x00" # sample sample_size
b"\x0C\x00", # sample data
stream.to_bytes(),
)
self.assertEqual(stream.length, 30)
if __name__ == "__main__":
unittest.main()