CODEWITHSUNDEEP
pythonjsonaws-lambdaaws-event-bridge
Merihan Awod
Merihan Awod

Reputation: 3

how can i retrieve value in JSON string in lambda python3

I'm developing an AWS lambda function that is triggered from an event bridge and then putting another event using python but struggling to retrieve a value from a variable in the Json string

below is the code

import json, boto3

client = boto3.client('events')

def lambda_handler(event, context):

testV2_dict={  
 "K1" : event['e1'] ,
"K2" : event['e2'] 
}

#converting python to json as (put_event - Details) section is expecting json
testV2=json.dumps(testV2_dict)

response = client.put_events(
         Entries=
          [
            {
             "DetailType": "test",
             "Source": "test",
             "Detail": "{ \"testK\": \"testV\",\"testK2\": \""+ testV2 +"\" }"
           }
          ]
        )

tried to add Details on different ways, "Detail": "{ \"testK\": \"testV\",\"testK2\": \""+ testV2 +"\" }" and still getting error as Malformated Details and if i deleted the ++, I'm getting word testV2 itself not the value from the above

How can I retrieve the value of testV2 in the Details inside the event?

Upvotes: 0

Views: 1069

Answers (2)

saikat sadhukha
saikat sadhukha

Reputation: 1

I don't think you need to do any thing the output of boto3 client has always been in JSON string.

Upvotes: -1

Tim Roberts
Tim Roberts

Reputation: 54708

You don't have enough escaping in there. If testV2 is supposed to be a JSON string emebedded in a JSON string embedded in as JSON string, then you need more string escapes. I would let json.dumps handle that:

import json
event = {'e1': 99, 'e2': 101}

testV2_dict={  
 "K1" : event['e1'] ,
 "K2" : event['e2'] 
}

testV2=json.dumps(testV2_dict)

detail = {
    "testK": "testV",
    "testK2": testV2
}

Entries= [
    {
     "DetailType": "test",
     "Source": "test",
     "Detail": json.dumps(detail),
   }
]

print(Entries)

Output:

[{'DetailType': 'test', 'Source': 'test', 'Detail': '{"testK": "testV", "testK2": "{\\"K1\\": 99, \\"K2\\": 101}"}'}]

Upvotes: 2

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