As per requirement I am doing the lambda testing locally using the LocalStack. I could able to deploy and invoke the lambda using localstack. But I get an error in the lambda handler code, as my code is accessing some external link through requests.get() module.
I have mocked those external link locally using wiremock, So If I try to access those link on terminal, I can get the response, but I gets below error when its getting called from Lambda which was invoked by Localstack.
Error:
INFO:root:error MyHTTPConnectionPool(host='localhost', port=8082): Max retries exceeded with url: /api/v1/health (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fff8314cee0>: Failed to establish a new connection: [Errno 111] Connection refused'))
Below is my localstack and wiremock configuration. I am creating both docker container with docker-compose.yml file
version: "3.3"
services:
localstack:
container_name: "${LOCALSTACK_DOCKER_NAME-localstack_main}"
image: localstack/localstack:3.0.0
platform: linux/amd64
ports:
- "4566:4566"
expose:
- "4566"
environment:
- SERVICES=lambda,s3,iam,logs
- AWS_DEFAULT_REGION=eu-west-1
- SKIP_SSL_CERT_DOWNLOAD=true
networks:
- shared-network
wiremock:
container_name: wiremock-container
platform: linux/amd64
image: wiremock/wiremock:2.31.0
volumes:
- $PWD/resources/wiremock:/home/wiremock
ports:
- "8082:8080"
networks:
- shared-network
networks:
shared-network:
name: local_network
Below is the Lambda handler code
def lambda_handler(event, context):
print("Lambda invoked")
# Some code
my_external_url = "http://localhost:8082/api/v1/health" # I am setting this link to get the mocked response through localstack
requests.get(my_external_url).json() # I get the error here
# Some code
return {
'status': 'OK',
}
I am mocking the links through wiremock, I can use any other way also for mocking the link if suggested. But I need to use localstack to invoke the lambda. Obviously there should be some use cases where lambda is trying to access some link, and local testing can be done through localstack by mocking those links.
I found there are 2 issues in the code.
1: When it's in Network and when one docker wants to communicate to the another docker, we need to call api like http://host.docker.internal:8080/api/v1/health instead of http://localhost:8080/api/v1/health
This has solved the issue locally running the test cases locally but when I tried it though Jenkins I ended up having the same error mentioned in my question. As a solution I have updated my localstack configuration in docker compose file, I have passed below configuration.
extra_hosts: