Got an example for StepFunctions in troposphere?

[Mark McWiggins]

I must be missing something; I got a Glue node to work easily but trying to add step functions and I get

TypeError: Object of type 'module' is not JSON serializable

# glue node 'job' creation omitted ...

t.add_resource(job)

step.StartAt = job

step.StateMachine = step.StateMachine('myStep')

step.StateMachine.StateMachineName = "myStep"

step.StateMachine.RoleArn = "StatesExecutionRole"

step.title = "yobaby"

step.StateMachine.DefinitionString =        '''     {                                                                                                                                                 

              "Comment": "Glue Node Step Function",                                                                                                                                                   

              "StartAt": "GlueJob",                                                                                                                                                                   

              "States": {                                                                                                                                                                             

                "GlueJob":                                                                                                                                                                            

                  "Type": "Task",                                                                                                                                                                     

                  "Resource": "{glueArn}",                                                                                                                                                            

                  "End": true                                                                                                                                                                         

                }                                                                                                                                                                                     

              }                                                                                                                                                                                       

'''

t.add_resource(step)

print (t.to_yaml())

Any ideas on this? Thanks much.

[Hugo Lopes Tavares]

Can you share the whole traceback message or at least more info than just that one line?

I believe that error message indicates something is calling json.dumps() on a module instead of a compatible object. 

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[Mark McWiggins]

Here you go; thanks much.

Traceback (most recent call last):

  File "./glue.py", line 38, in <module>

    print (t.to_yaml())

  File "/home/ubuntu/dbtry/lib/python3.6/site-packages/troposphere/__init__.py", line 793, in to_yaml

    return cfn_flip.to_yaml(self.to_json(), clean_up=clean_up,

  File "/home/ubuntu/dbtry/lib/python3.6/site-packages/troposphere/__init__.py", line 790, in to_json

    sort_keys=sort_keys, separators=separators)

  File "/usr/lib/python3.6/json/__init__.py", line 238, in dumps

    **kw).encode(obj)

  File "/usr/lib/python3.6/json/encoder.py", line 201, in encode

    chunks = list(chunks)

  File "/usr/lib/python3.6/json/encoder.py", line 430, in _iterencode

    yield from _iterencode_dict(o, _current_indent_level)

  File "/usr/lib/python3.6/json/encoder.py", line 404, in _iterencode_dict

    yield from chunks

  File "/usr/lib/python3.6/json/encoder.py", line 404, in _iterencode_dict

    yield from chunks

  File "/usr/lib/python3.6/json/encoder.py", line 437, in _iterencode

    o = _default(o)

  File "/usr/lib/python3.6/json/encoder.py", line 180, in default

    o.__class__.__name__)

TypeError: Object of type 'module' is not JSON serializable

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[Hugo Lopes Tavares]

Sorry, I can't pinpoint where the problem is,

but here are a few suggestions:

* add calls to t.to_yaml() after all t.add_resource(...) calls and the first to fail is where you should focus

* check your troposphere objects looking for properties that use objects that look like module names you imported earlier (it's easy to name a variable json and import json too) 

* search for all modules you imported at the top of the file and look for odd places using a module (text search)

Good luck! 

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