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SnakePlane suggestion: Add get_constant to 'logger' or generic 'alteryx_engine' namespace


While working on a recent tool using SnakePlane, I needed a temp directory for files. While I ended up using the Python tempfile package instead, I tried finding the TempFilePath workflow constant at one point.


It appears that the alteryx_engine inside AyxPlugin is hidden from the 'pilot', and as such, the output_message method is only exposed to the 'pilot' through the logger. So to get access to get_constant method, I added it temporarily to the self.logging SimpleNamespace following the pattern, and was able to use the following in Pdb:


(Pdb) logger.get_constant(0)
('Engine.GuiInteraction', '', '0', False)
(Pdb) logger.get_constant(1)
('Engine.IterationNumber', '', '0', True)
(Pdb) logger.get_constant(2)
('Engine.ModuleDirectory', '', 'C:\\Users\\<user>\\Documents\\~Alteryx\\snakeplane-master\\pilot\\debug_workflows\\', False)
(Pdb) logger.get_constant(3)
('Engine.TempFilePath', '', 'C:\\Users\\<user>\\AppData\\Local\\Temp\\Engine_7016_d592e2b9ab1c4a87b2c08afb64a01e81_\\', False)
(Pdb) logger.get_constant(4)
('Engine.Version', '', '2019.2.5.62427', False)
(Pdb) logger.get_constant(5)
('Engine.WorkflowDirectory', '', 'C:\\Users\\<user>\\Documents\\~Alteryx\\snakeplane-master\\pilot\\debug_workflows\\', False)
(Pdb) logger.get_constant(6)
('Engine.WorkflowFileName', '', './debug_workflows/SFTPInput.yxmd', False)


Does alteryx_engine need to be hidden in this fashion? If so, can we add some more features of the engine to either the logger, or a new SimpleNamespace? When I check dir(sdk.AlteryxEngine) I see the following methods that could be valuable to 'pilot':


[..., 'create_connect_metadata', 'create_temp_file_name', 'debug_message_out', 'decrypt_password', 'field_conversion_error_limit', 'get_constant', 'get_init_var', 'output_message', 'output_tool_progress', 'pre_sort', 'xmsg']


Several of these look indispensable!


The change to helper_classes for get_constant was simple enough:




If I can figure out how to submit a pull request on github ... I'll try it out.


Hi @c2willis - can you post this as an issue in the snakeplane GitHub repo? It will get more traction with the team who manages it. Thanks!