Print Deprecated Go Lambda Functions to CSV

print_deprecated_go_lambdas.py

import subprocess
import csv

# Define the list of AWS regions as of my last update in September 2021.
aws_regions = [
    "us-east-1", "us-east-2", "us-west-1", "us-west-2",
    "af-south-1", "ap-east-1", "ap-south-1", "ap-northeast-2",
    "ap-southeast-1", "ap-southeast-2", "ap-northeast-1",
    "ca-central-1", "eu-central-1", "eu-west-1", "eu-west-2",
    "eu-south-1", "eu-west-3", "eu-north-1", "me-south-1",
    "sa-east-1"
]

# Open a CSV file for writing
with open("lambda_functions.csv", "w", newline="") as csvfile:
    # Create a CSV writer object
    csvwriter = csv.writer(csvfile)

    # Write the header
    csvwriter.writerow(["Region", "FunctionARN"])

    # Loop through each AWS region and run the AWS CLI command
    for region in aws_regions:
        print(f"Processing region: {region}")

        # Run the AWS CLI command
        cmd = [
            "aws", "lambda", "list-functions",
            "--function-version", "ALL",
            "--region", region,
            "--output", "text",
            "--query", "Functions[?Runtime=='go1.x'].FunctionArn"
        ]

        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

        # Check for errors
        if result.stderr:
            print(f"Error: {result.stderr}")
            continue

        # Skip if the output is just a single double-quote
        if result.stdout.strip() == '"':
            continue

        # Parse the stdout and write to CSV
        function_arns = result.stdout.strip()

        # Split the function ARNs by 'arn:aws:lambda'
        function_arns = function_arns.split('arn:aws:lambda')

        # Remove any empty strings, and strip each element
        function_arns = [f'arn:aws:lambda{arn.strip()}' for arn in function_arns if arn.strip()]

        for arn in function_arns:
            csvwriter.writerow([region, arn])

print("Done.")