Pass current timestamp as POST request body in AWS API Gateway call to AWS Lambda












0















I have below scenarios:



1) AWS API Gateway POST call to AWS Lambda with a request body as



{"body : 'some values'}


2) AWS Lambda performs come calculations and inserts input data and calulated value into DynamoDB.



The issue is, these are runtime calculations and there are cases where input data (total 9 values) might come same with any one of the value different. I want all these values to be inserted into DynamoDB.



If I keep 'ID' as primary index, the input replaces old input (even though some other value is different in the input).



Solution I tried:



I added 'datetime' field as primary index of my table and calculated 'datetime' as now() in lambda function (python 3).
However this datetime give timestamp when the lambda function was saved which again replaces my old values with new one in DynamoDB.



I tried sending POST request with as below:



{"data":"some_value",
"timestamp":"$context.requestTime"
}


This is not resolving $context.requestTime to its value and just prints this as string as it is.



Thanks in advance.










share|improve this question



























    0















    I have below scenarios:



    1) AWS API Gateway POST call to AWS Lambda with a request body as



    {"body : 'some values'}


    2) AWS Lambda performs come calculations and inserts input data and calulated value into DynamoDB.



    The issue is, these are runtime calculations and there are cases where input data (total 9 values) might come same with any one of the value different. I want all these values to be inserted into DynamoDB.



    If I keep 'ID' as primary index, the input replaces old input (even though some other value is different in the input).



    Solution I tried:



    I added 'datetime' field as primary index of my table and calculated 'datetime' as now() in lambda function (python 3).
    However this datetime give timestamp when the lambda function was saved which again replaces my old values with new one in DynamoDB.



    I tried sending POST request with as below:



    {"data":"some_value",
    "timestamp":"$context.requestTime"
    }


    This is not resolving $context.requestTime to its value and just prints this as string as it is.



    Thanks in advance.










    share|improve this question

























      0












      0








      0








      I have below scenarios:



      1) AWS API Gateway POST call to AWS Lambda with a request body as



      {"body : 'some values'}


      2) AWS Lambda performs come calculations and inserts input data and calulated value into DynamoDB.



      The issue is, these are runtime calculations and there are cases where input data (total 9 values) might come same with any one of the value different. I want all these values to be inserted into DynamoDB.



      If I keep 'ID' as primary index, the input replaces old input (even though some other value is different in the input).



      Solution I tried:



      I added 'datetime' field as primary index of my table and calculated 'datetime' as now() in lambda function (python 3).
      However this datetime give timestamp when the lambda function was saved which again replaces my old values with new one in DynamoDB.



      I tried sending POST request with as below:



      {"data":"some_value",
      "timestamp":"$context.requestTime"
      }


      This is not resolving $context.requestTime to its value and just prints this as string as it is.



      Thanks in advance.










      share|improve this question














      I have below scenarios:



      1) AWS API Gateway POST call to AWS Lambda with a request body as



      {"body : 'some values'}


      2) AWS Lambda performs come calculations and inserts input data and calulated value into DynamoDB.



      The issue is, these are runtime calculations and there are cases where input data (total 9 values) might come same with any one of the value different. I want all these values to be inserted into DynamoDB.



      If I keep 'ID' as primary index, the input replaces old input (even though some other value is different in the input).



      Solution I tried:



      I added 'datetime' field as primary index of my table and calculated 'datetime' as now() in lambda function (python 3).
      However this datetime give timestamp when the lambda function was saved which again replaces my old values with new one in DynamoDB.



      I tried sending POST request with as below:



      {"data":"some_value",
      "timestamp":"$context.requestTime"
      }


      This is not resolving $context.requestTime to its value and just prints this as string as it is.



      Thanks in advance.







      amazon-web-services post aws-lambda amazon-dynamodb aws-api-gateway






      share|improve this question













      share|improve this question











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      share|improve this question










      asked Nov 15 '18 at 9:42









      Rohan HodarkarRohan Hodarkar

      7317




      7317
























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