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def extension_start(self, fields):
"""Required method that serves as the starting point for work performed
for a task instance.
Parameters
----------
fields : dict
populated with field values from the associated task instance
launched in the Controller
Returns
-------
ExtensionResult
once the work is done, an instance of ExtensionResult must be
returned. See the documentation for a full list of parameters that
can be passed to the ExtensionResult class constructor
"""
my_msg = "{{ msg }}"
# Get the value of the 'action' field
action_field = fields.get('action', [""])])
if len(action_field) != 1:
# 'action' field was not specified or is invalid
action = ''
else:
action = action_field[0]
if action.lower() == 'print':
# Print to standard output...
print(my_msg)
else:
# Log to standard error...
logger.info(my_msg)
# Return the result with a payload containing a Hello message...
return ExtensionResult(
unv_output='Hello Extension!'
) |
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