Created
January 1, 2018 23:23
-
-
Save votaguz/c55a7ef5f6540e0fc233fe66e877516f to your computer and use it in GitHub Desktop.
Script to clone lambda functions in AWS
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import argparse | |
import os | |
import random | |
import string | |
import boto3 | |
LAMBDA_CONFIG_TEMPLATE = ["TracingConfig", "FunctionName", "VpcConfig", "MemorySize", "Environment", "Handler", "Role", "Timeout", "Runtime", "Description"] | |
def clone_lambda(aws_client, name, code_zipfile_path): | |
""" | |
This function clones a lambda in your AWS stack | |
""" | |
absolute_file_path = os.path.abspath(code_zipfile_path) | |
random_suffix = ''.join([random.choice(string.ascii_letters + string.digits) for n in xrange(12)]) | |
with open(absolute_file_path) as zipfile: | |
new_lambda_config = {} | |
print("Getting configuration of {}".format(name)) | |
current_lambda = aws_client.get_function(FunctionName=name) | |
current_lambda_config = current_lambda.get('Configuration') | |
print("Creating configuration for new lambda") | |
for config in current_lambda_config.keys(): | |
if config in LAMBDA_CONFIG_TEMPLATE: | |
new_lambda_config[config] = current_lambda_config[config] | |
new_lambda_config.get('VpcConfig').pop('VpcId') | |
new_lambda_config['Code'] = {} | |
new_lambda_config['Code']['ZipFile'] = b'{}'.format(zipfile.read()) | |
new_lambda_function_name = "{}-{}".format(current_lambda_config['FunctionName'], random_suffix) | |
new_lambda_config['FunctionName'] = new_lambda_function_name | |
print("Creating new lambda function") | |
aws_client.create_function(**new_lambda_config) | |
print("{} Created".format(new_lambda_function_name)) | |
if __name__ == "__main__": | |
argument_parser = argparse.ArgumentParser(description='Clone a lambda function from AWS') | |
argument_parser.add_argument('name', type=str, help='Name of function to be cloned') | |
argument_parser.add_argument('code_zipfile_path', type=str, help='Code zipfile path') | |
args = argument_parser.parse_args() | |
aws_client = boto3.client('lambda') | |
clone_lambda(aws_client, args.name, args.code_zipfile_path) |
Then this would look like this:
with open(absolute_file_path) as zipfile:
new_lambda_config = {}
print("Getting configuration of {}".format(name))
current_lambda = aws_client.get_function(FunctionName=name)
copy_lambda_config(current_lambda.get('Configuration'), new_lambda_config)
...
things can go wrong here too:
new_lambda_config['Code']['ZipFile'] = b'{}'.format(zipfile.read())
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
you assume everything is going to work.
You need to add some error handling when things like these fail:
aws_client
hasn't been initialized (e.g. network error)when this fails:
current_lambda = aws_client.get_function(FunctionName=name)
when this fails:
current_lambda_config = current_lambda.get('Configuration')
You assume this will always work, what if these keys no longer work in the future?
new_lambda_config.get('VpcConfig').pop('VpcId')
I'd probably factor this out (into a
copy_lambda_config(source, target)
method, to shorten the logic of the main method