Created
August 4, 2021 07:43
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import concurrent.futures | |
import json | |
import logging | |
import requests | |
# AWS pricing API Endpoint | |
URL = "https://a0.p.awsstatic.com/pricing/1.0/ec2/region/{region}/reserved-instance/linux/index.json" | |
class AWSService: | |
# Retrieving EC2 instance prices from AWS EC2 Pricing API | |
@classmethod | |
def get_ec2_prices(cls, **kwargs): | |
prices_list = [] | |
try: | |
response = requests.get(URL.format(region=kwargs["region"])) | |
try: | |
pricing_data = response.json() | |
prices = pricing_data["prices"] | |
for price in prices: | |
if cls.is_valid_input(price["attributes"], **kwargs): | |
prices_list.append(price) | |
except Exception as exc: | |
cls.exception_handler(exc) | |
except Exception as exc: | |
cls.exception_handler(exc) | |
return prices_list | |
@staticmethod | |
def is_valid_input(base_argument, **kwargs): | |
original_values = { | |
"term_offering_class": base_argument["aws:offerTermOfferingClass"], | |
"term_length": base_argument["aws:offerTermLeaseLength"], | |
"payment_option": base_argument["aws:offerTermPurchaseOption"], | |
"operating_system": base_argument["aws:ec2:operatingSystem"], | |
"tenancy": base_argument["aws:ec2:tenancy"], | |
} | |
user_values = { | |
"term_offering_class": kwargs["term_offering_class"], | |
"term_length": kwargs["term_length"], | |
"payment_option": kwargs["payment_option"], | |
"operating_system": kwargs["operating_system"], | |
"tenancy": kwargs["tenancy"], | |
} | |
for key in original_values.keys(): | |
if original_values.get(key) != user_values.get(key): | |
return False | |
return True | |
@classmethod | |
def save_prices_in_file(cls, prices_list, file_id): | |
prices = json.dumps(prices_list) | |
try: | |
with open(f"./prices/ec2_price_{file_id}.json", "w") as prices_file: | |
prices_file.write(prices) | |
except Exception as exc: | |
cls.exception_handler(exc) | |
@staticmethod | |
def exception_handler(exception): | |
# Store possible exceptions in a map of key as exception class and value as a message | |
exception_map = { | |
json.decoder.JSONDecodeError: "JSON Decode Error", | |
KeyError: "Key not found in JSON response", | |
requests.exceptions.InvalidSchema: "Invalid URL. No connection adapters found", | |
requests.exceptions.HTTPError: "HTTP error", | |
requests.exceptions.ConnectionError: "Failed to establish a new connection", | |
requests.exceptions.RequestException: "Request Exception", | |
FileNotFoundError: "The prices directory is not present", | |
} | |
message = exception_map.get(exception.__class__) | |
if message is None: | |
message = exception | |
logging.exception(message, exc_info=False) | |
# Running get_ec2_prices and save_prices_in_file function using this function | |
# This will enable us to run both functions in a single thread as both functions are dependent on each other | |
# This will create new file for every input using file_id | |
@staticmethod | |
def get_and_save_ec2_prices(*args): | |
list_of_args = list(args) | |
file_id = list_of_args[0] | |
reg = list_of_args[1] | |
term_offer_cls = list_of_args[2] | |
term_len = list_of_args[3] | |
payment_opt = list_of_args[4] | |
prices_list = AWSService.get_ec2_prices( | |
region=reg, | |
term_offering_class=term_offer_cls, | |
term_length=term_len, | |
payment_option=payment_opt, | |
operating_system="Linux", | |
tenancy="Shared", | |
) | |
# If prices_list is not empty then save the prices_list data into the file | |
if len(prices_list) != 0: | |
AWSService.save_prices_in_file(prices_list, file_id) | |
# List of inputs | |
# list_of_input[i] = ["id", "region", "term_offering_class", "term_length", "payment_option", "operating_system", "tenancy"] | |
list_of_input = [ | |
["0", "ap-south-1", "standard", "1yr", "No Upfront", "Linux", "Shared"], | |
["1", "us-east-1", "convertible", "1yr", "No Upfront", "Linux", "Shared"], | |
] | |
# Get prices for all inputs in parallel | |
with concurrent.futures.ThreadPoolExecutor() as executor: | |
for list_of_arguments in list_of_input: | |
executor.submit(AWSService.get_and_save_ec2_prices, *list_of_arguments) |
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