How to pass and retrieve constant json data to lambda function

Question

I have lambda function defined sth like :

def lambda_handler(event, context):

   #get constant json argument passed from cloudwatch event rule

   ...

What is the way to get the values defined in Target/Configure Input /Constant(Json text).

@Leon yes , but the question is how do I retrieve it ? should I change `def lambda_handler(event, context):` ? — sakhunzai, Nov 18 '16 at 12:34
have done that already it does not get the additional data passed :) — sakhunzai, Nov 18 '16 at 13:34

score 30 · Accepted Answer · edited Jun 08 '17 at 07:17

30

As I read in AWS documents, json passed to python as dict type. And then I simply call the value like this:

passed json:

{"type": "daily", "retention": 7}

Then in your handler:

def lambda_handler(event, context):
    type = event["type"]
    rententionDay = event["retention"]
    ...

Use this I was able to make an automation snapshot for all ebs volumes. Hope it help.

edited Jun 08 '17 at 07:17

SarangArd

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answered Apr 07 '17 at 02:46

Dominic Nguyen

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knrdk · Answer 2 · 2017-02-27T11:03:04.520

2

This is based on NodeJS, but it should be the same for Python. The Constant under Input is a simple JSON encoded object, which can then be accessed using the event variable.

Input

{ "config": "uk" }

Lambda

console.log(event.config)

Found this entry as one of the top Google results, so hopefully this will help someone else.

edited Feb 27 '17 at 11:03

answered Feb 27 '17 at 00:49

knrdk

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How to pass and retrieve constant json data to lambda function

2 Answers2

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