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FreeOpcUa / opcua-asyncio

OPC UA library for python >= 3.7
GNU Lesser General Public License v3.0
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Server crash with HistoryDict and empty SourceTimestamp #779

Open ondrejnovakcvut opened 2 years ago

ondrejnovakcvut commented 2 years ago

Describe the bug
When running the server with HistoryDict enabled and using a client that does not set SourceTimestamp (tested with UA Expert), function read_raw_history fails with TypeError: '<=' not supported between instances of 'datetime.datetime' and 'NoneType' when it tries to filter out the values out of range given by function parameters starttime and endtime.

To Reproduce

  1. Run opcua-asyncio server with HistoryDict enabled (server.iserver.history_manager.set_storage(HistoryDict()))
  2. Create a variable, set it writable (myvar.set_writable()) and enable its historization (server.historize_node_data_change(myvar, period=None, count=100))
  3. Change a value of a variable by client that does not set SourceTimestamp
  4. Call server.read_raw_history(numvalues=10)

Expected behavior
I'm not sure what the function should do with records having SourceTimestamp equal to None. HistorySQLite seems to ignore these values (the list only contains values having SourceTimestamp set). Maybe there could be a parameter to read_raw_history that would tell the function to include these values.

Version
Python-Version: 3.9 opcua-asyncio Version): asyncua==0.9.92 from pypi

oroulet commented 2 years ago

that dict history stuff was more a code example that something really usefull. fix welcome. It should not be really hard

AndreasHeine commented 2 years ago

does values without timestamps make sense in a history?

ondrejnovakcvut commented 2 years ago

does values without timestamps make sense in a history?

it probably doesn't, but it's handy for debugging

that dict history stuff was more a code example that something really usefull. fix welcome. It should not be really hard

I'll take a look on it