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Combining `InputPath` and `Parameters` in AWS States Language


Amazon SES example Perl script not working in raw -r mode using stdin under windowsUsing R's Digest Package to Sign an HTTP request to Amazon Dynamodb's APICan Cross Account Access EC2 Role be Created?How to reuse state definition across aws state machines?How to continue the execution a step function in aws if one of the states in a parallel state fails?Amazon States Language - Global and transaction cacheAWS State Machine that can “branch” into a different State Machine by ARNOutput Data in Wait State of Step FunctionParallel States Merge the output in Step Function













0















The AWS States Language specification describes the role of the InputPath and Parameters fields but does not give an example of the filters being used together.



My understanding is that, if specified, the JSON path given by the InputPath field is applied to the raw input producing the effective input. Then, if specified, the value of the parameters field is applied, modifying the effective input.



Extending the example given in the spec, given the following Task state definition:



"X": 
"Type": "Task",
"Resource": "arn:aws:swf:us-east-1:123456789012:task:X",
"Next": "Y",
"InputPath": "$.sub",
"Parameters":
"flagged": true,
"parts":
"first.$": "$.vals[0]",
"last3.$": "$.vals[3:]"





then, given the following input:




"flagged": 7,
"sub" :
"vals": [0, 10, 20, 30, 40, 50]




the effective input to the code identified in the Resource field would be:




"flagged": true,
"parts":
"first": 0,
"last3": [30, 40, 50]




Is my interpretation correct?










share|improve this question


























    0















    The AWS States Language specification describes the role of the InputPath and Parameters fields but does not give an example of the filters being used together.



    My understanding is that, if specified, the JSON path given by the InputPath field is applied to the raw input producing the effective input. Then, if specified, the value of the parameters field is applied, modifying the effective input.



    Extending the example given in the spec, given the following Task state definition:



    "X": 
    "Type": "Task",
    "Resource": "arn:aws:swf:us-east-1:123456789012:task:X",
    "Next": "Y",
    "InputPath": "$.sub",
    "Parameters":
    "flagged": true,
    "parts":
    "first.$": "$.vals[0]",
    "last3.$": "$.vals[3:]"





    then, given the following input:




    "flagged": 7,
    "sub" :
    "vals": [0, 10, 20, 30, 40, 50]




    the effective input to the code identified in the Resource field would be:




    "flagged": true,
    "parts":
    "first": 0,
    "last3": [30, 40, 50]




    Is my interpretation correct?










    share|improve this question
























      0












      0








      0








      The AWS States Language specification describes the role of the InputPath and Parameters fields but does not give an example of the filters being used together.



      My understanding is that, if specified, the JSON path given by the InputPath field is applied to the raw input producing the effective input. Then, if specified, the value of the parameters field is applied, modifying the effective input.



      Extending the example given in the spec, given the following Task state definition:



      "X": 
      "Type": "Task",
      "Resource": "arn:aws:swf:us-east-1:123456789012:task:X",
      "Next": "Y",
      "InputPath": "$.sub",
      "Parameters":
      "flagged": true,
      "parts":
      "first.$": "$.vals[0]",
      "last3.$": "$.vals[3:]"





      then, given the following input:




      "flagged": 7,
      "sub" :
      "vals": [0, 10, 20, 30, 40, 50]




      the effective input to the code identified in the Resource field would be:




      "flagged": true,
      "parts":
      "first": 0,
      "last3": [30, 40, 50]




      Is my interpretation correct?










      share|improve this question














      The AWS States Language specification describes the role of the InputPath and Parameters fields but does not give an example of the filters being used together.



      My understanding is that, if specified, the JSON path given by the InputPath field is applied to the raw input producing the effective input. Then, if specified, the value of the parameters field is applied, modifying the effective input.



      Extending the example given in the spec, given the following Task state definition:



      "X": 
      "Type": "Task",
      "Resource": "arn:aws:swf:us-east-1:123456789012:task:X",
      "Next": "Y",
      "InputPath": "$.sub",
      "Parameters":
      "flagged": true,
      "parts":
      "first.$": "$.vals[0]",
      "last3.$": "$.vals[3:]"





      then, given the following input:




      "flagged": 7,
      "sub" :
      "vals": [0, 10, 20, 30, 40, 50]




      the effective input to the code identified in the Resource field would be:




      "flagged": true,
      "parts":
      "first": 0,
      "last3": [30, 40, 50]




      Is my interpretation correct?







      amazon-web-services aws-step-functions






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 25 at 15:35









      Michael ThomasMichael Thomas

      7904 silver badges15 bronze badges




      7904 silver badges15 bronze badges




















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