aws-cost-on-slack.py

import json
import boto3
import requests
from datetime import datetime, timedelta

CLIENT = boto3.client('ce')

SLACK_WEBHOOK_URL = '' # Enter the slack webhook url.

def lambda_handler(event, context):
    START_DATE = (datetime.now() - timedelta(days=2)).strftime('%Y-%m-%d')
    END_DATE = (datetime.now() - timedelta(days=1)).strftime('%Y-%m-%d')
    
    AWS_ACCOUNT_ID = [''] # Enter your aws account id. If you have multiple accounts put all account ids.
    
    for account_id in AWS_ACCOUNT_ID:
        COST = CLIENT.get_cost_and_usage(
            TimePeriod = {'Start': START_DATE, 'End': END_DATE},
            Granularity = 'DAILY',
            Metrics = ['UnblendedCost'],
            Filter = {'Dimensions': {
                'Key': 'LINKED_ACCOUNT', 'Values': [account_id]
            }}
        )
        
        TOTAL_COST = round(float(COST['ResultsByTime'][0]['Total']['UnblendedCost']['Amount']), 2)
        UNIT = COST['ResultsByTime'][0]['Total']['UnblendedCost']['Unit']
        
        SLACK_MESSAGE = {
            "channel": "#aws-cost",
            "username": "AWS Cost Monitor",
            "text": f"Your AWS account {account_id} due {TOTAL_COST} {UNIT} on {START_DATE}.",
            "icon_emoji": ":ghost:",
        }
        ENCODED_SLACK_MESSAGE = json.dumps(SLACK_MESSAGE).encode('utf-8')
        
        SLACK_RESPONSE = requests.post(SLACK_WEBHOOK_URL, ENCODED_SLACK_MESSAGE)
        print(SLACK_RESPONSE.text)