AWS Lambda dependency issue with botocore/awscrt

Question

I have a lambda function in python which worked good for a while. I tried to add CloudFront keyValueStore to the function and locally i got into an error:

[ERROR] MissingDependencyException: Missing Dependency: This operation requires an additional dependency. Use pip install botocore[crt] before proceeding.
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 56, in lambda_handler
    upload_files(env, client, zip_file_path, parts[-1], user_name)
  File "/var/task/lambda_function.py", line 125, in upload_files
    update_keyvaluestore(env, client, values)
  File "/var/task/lambda_function.py", line 239, in update_keyvaluestore
    e_tag = cloudfront_keyvaluestore_client.describe_key_value_store(
  File "/var/task/botocore/client.py", line 565, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/var/task/botocore/client.py", line 967, in _make_api_call
    ) = self._resolve_endpoint_ruleset(
  File "/var/task/botocore/client.py", line 1130, in _resolve_endpoint_ruleset
    auth_info = self._ruleset_resolver.auth_schemes_to_signing_ctx(
  File "/var/task/botocore/regions.py", line 711, in auth_schemes_to_signing_ctx
    raise MissingDependencyException(

Locally i've manage to solve this by doing pip install awscrt But, when i created the new zip with the new dependency - i run into the same error.

I've already tried to add botocore, awscrt, boto3 folders to the zip file with all the dependencies, but it still not working.

Answer 1

We managed to fix it after long investigation. When creating a client you should add a config signature version 4.

for examples:

in python:

from botocore.config import Config
my_config = Config(
        signature_version='v4',
    )
cloudfront_keyvaluestore_client = boto3.client('cloudfront-keyvaluestore', config=my_config, region_name='us-east-1')

in NodeJS:

import '@aws-sdk/signature-v4-crt';
import { SignatureV4MultiRegion } from '@aws-sdk/signature-v4-multi-region';
const cloudFrontClient = new CloudFrontKeyValueStoreClient({
    region: REGION,
    signerConstructor: SignatureV4MultiRegion,
});

Thanks for the help!