How do I invoke another lambda async and pass context to it

Question

I'm trying to work out two basic lambdas using Python2.7 runtime for SQS message processing. 

One lambda reads from SQS invokes and passes data to another lambda via context. I can invoke the other lambda but the user context is empty in it. This is the code of SQS reader lambda I wrote:

import boto3
import base64
import json
import logging

messageDict = {'queue_url': 'queue_url',
       'receipt_handle': 'receipt_handle',
       'body': 'messageBody'}
ctx = {
   'custom': messageDict,
   'client': 'SQS_READER_LAMBDA',
   'env': {'test': 'test'},
}

payload = json.dumps(ctx)
payloadBase64 = base64.b64encode(payload)

client = boto3.client('lambda')
client.invoke(
    FunctionName='LambdaWorker',
    InvocationType='Event',
    LogType='None',
    ClientContext=payloadBase64,
    Payload=payload
)
And this is how I'm trying to inspect and print the contents of context variable inside invoked lambda, so I could check logs in CloudWatch:

memberList = inspect.getmembers(context)
    for a in memberList:

       logging.error(a)

 

Nothing is working here  and CloudWatch shows user context is empty:

('client_context', None)

I took reference from this as well:  https://github.com/aws/aws-sdk-js/issues/1388 but still now working

Help!!!!

Answer 1

I tried several times trying to pass the data through the context then I gave up on it.
However, I was able to pass the data through the Payload param:

client.invoke(
    FunctionName='LambdaWorker',
    InvocationType='Event',
    LogType='None',
    Payload=json.dumps(payload)
)

And then to read it from event parameter inside invoked lambda:

ctx = json.dumps(event)