robhowley / lambda-warmer-py Goto Github PK

I got such error on lambda warming and I created cloudwatch event rule as you give in example.

[ERROR] KeyError: 'requestContext'
Traceback (most recent call last):
  File "/opt/python/lib/python3.8/site-packages/codeguru_profiler_agent/aws_lambda/profiler_decorator.py", line 52, in profiler_decorate
    return function(event, context)
  File "/opt/python/lib/python3.8/site-packages/codeguru_profiler_agent/aws_lambda/lambda_handler.py", line 91, in call_handler
    return handler_function(event, context)
  File "/var/task/mangum/adapter.py", line 101, in __call__
    scope = self.create_scope(event, context)
  File "/var/task/mangum/adapter.py", line 118, in create_scope
    request_context = event["requestContext"]

I read README, applied warmer to my lambda.
It seems that json format

{
    "warmer": true,
    "concurrency": 1
}

written here does not fit what aws requires...
How can I apply event pattern then?

Also, just wondering the reason for using lambda-warmer, not just ping lambda every constant minute using aws cloud watch event bridge.

Maybe I'm off-base here, but it seems like we want to decorate the function so we don't have to think about handling the warming event in any way at all in our code. As it's written, I still have to write custom handling logic for when the warming event comes in. If this change doesn't make sense could you either correct me in my usage or explain to me why it makes sense not to short-circuit inside the decorator?

When the warmer cannot invoke the lambda function (concurrency > 1) there's no way to actually see why.
Printing the exception would be a first help.

With reference to the code
https://stackoverflow.com/a/39457165/1117238

If the lambda is invoke one by one in a python for loop, wouldn't it just invoke the same lambda instance?

I am using lambda warmers on lambda functions that are connected as resolvers to AWS AppSync (graphql)
AppSync has a feature that enables batches for a lambda function (resolver), resulting in a List of events.
Therefore we receive this error when the invocation is not a warmer invocation.

@functools.wraps(f)
def wrapped_func(event, context, *args, **kwargs):

    execution_info = dict(
        instance_id=context.aws_request_id,
        is_warmer_invocation=event.get(flag) or False,
        **LAMBDA_INFO
    )
  AttributeError: 'list' object has no attribute 'get'

../../../.venv/lib/python3.9/site-packages/lambdawarmer/init.py:34: AttributeError

Hello,

I'm using framework fastApi with mangum for my lambda functions.

Therefore, here is my code to make my app serverless:

from fastapi import FastAPI
from mangum import Mangum
import lambdawarmer

app = FastAPI()

@lambdawarmer.warmer
handler = Mangum(app)

This works perfectly without the @lambdawarmer.warmer line

BUT, this doesn't work as handler should be a function as per your guide.

How should I manage such case ?

Thanks

Does AWS Provisioned Concurrency makes this library obsolete and not needed ? https://docs.aws.amazon.com/lambda/latest/dg/provisioned-concurrency.html

Ref screenshots,

I passed the event.json with the required parameters,

But he doesn't seem to find these parameters within the wrapper function.

I'm haing an issue when trying to log metrics to cloudwatch, I'm not seeing anything, I'm sending this json as payload:

{ "warmer": true, "concurrency": 6, "send_metric" : true }

also the decorator is on the function

Any suggestion?