Python call my AWS lambda from code with boto3 error

Question

In my project i have to create a py that call a lambda function passing body parameters, i write this code:

import boto3
import json
import base64

client = boto3.client(‘lambda’)
d = {'calID': '[email protected]', 'datada': '2017-12-22T16:40:00+01:00', 'dataa': '2017-12-22T17:55:00+01:00', 'email': '[email protected]'}
s = json.dump(d)
s64 = base64.b64encode(s.encode('utf-8'))

response = client.invoke(
    FunctionName='arn:aws:lambda:eu-west-1:13737373737:function:test',
    InvocationType='RequestResponse',
    LogType='None',
    ClientContext='None',
    Payload=s64
)

but when response run this error is generated:

InvalidRequestContentException: An error occurred (InvalidRequestContentException) when calling the Invoke operation: Could not parse request body into json: Unrecognized token 'eyJjYWxJRCI6ICI5MmRxaXNzNWJnODdldGNxZWVhbWxtb2IyZ0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29tIiwgImRhdGFkYSI6ICIyMDE3LTEyLTIyVDE2OjQwOjAwKzAxOjAwIiwgImRhdGFhIjogIjIwMTctMTItMjJUMTc6NTU6MDArMDE6MDAiLCAiZW1haWwiOiAibHVjYV9ncmV6eml4eEBob3RtYWlsLmNvbSJ9': was expecting ('true', 'false' or 'null') at [Source: [B@4587098d; line: 1, column: 481]

what this mean?

Many thanks in advance

You can simply do Payload=json.dumps(d). Nothing else is needed — hjpotter92
– hjpotter92, Commented Dec 21, 2017 at 22:32
Hi, if i use d the response is : ParamValidationError: Parameter validation failed: Invalid type for parameter Payload, type: <class 'dict'>, valid types: <class 'bytes'>, <class 'bytearray'>, file-like object — AleMal
– AleMal, Commented Dec 21, 2017 at 22:34
Sorry, yes. It was meant to be json.dumps. Edited the previous comment as well. Please also see github.com/cleesmith/boto3_test/blob/master/invoke.py#L42 — hjpotter92
– hjpotter92, Commented Dec 21, 2017 at 22:35
if i use s (json.dumps(d)) code return : InvalidRequestContentException: An error occurred (InvalidRequestContentException) when calling the Invoke operation: Client context must be a valid Base64-encoded JSON object. — AleMal
– AleMal, Commented Dec 21, 2017 at 22:37

hjpotter92 · Accepted Answer · 2017-12-21 22:52:02Z

12

The error is because of the following parameter:

ClientContext='None',

From the docs:

ClientContext (string) --

Using the ClientContext you can pass client-specific information to the Lambda function you are invoking. You can then process the client information in your Lambda function as you choose through the context variable. For an example of a ClientContext JSON, see PutEvents in the Amazon Mobile Analytics API Reference and User Guide .

The ClientContext JSON must be base64-encoded and has a maximum size of 3583 bytes.

You do not need the ClientContext parameter here at all. Simply invoke as follows:

response = client.invoke(
    FunctionName='arn:aws:lambda:eu-west-1:13737373737:function:test',
    LogType='None',
    Payload=json.dumps(d)
)

answered Dec 21, 2017 at 22:52

hjpotter92

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