Introduction

Create an AWS Serverless Application with S3, SNS, Lambda, EventBridge and IAM.

Application Architecture

This diagram shows the services used in this app.

Steps

Step 1: Create a S3 bucket and upload the word-list file

Step 2: Create a SNS topic and add an email subscription

Step 3: Create a Lambda function to get a random word from the word list file in S3 bucket and send the daily word email

import json
import boto3
import random

def send_sns(message, subject):
    try:
        sns = boto3.client('sns') 
        topic_arn = "yourTopARN"
        result = sns.publish(TopicArn=topic_arn, Message=message, Subject=subject)
        if result['ResponseMetadata']['HTTPStatusCode'] == 200:
            print(result)
            print("Notification send successfully!")
            return True
    except Exception as err:
        print("Error occured while publish notifications and error is: ", err)
        return False

def get_random_item(my_list):
    # Check if the list is empty
    if not my_list:
        return None

    # Select a random item from the list
    random_item = random.choice(my_list)
    return random_item

def lambda_handler(event, context):
    try:
        bucket_name = "daily-vocab-bucket-jan"
        s3_vocab_file_name = "WordsList1.csv"

        # read from s3 and get the daily word
        s3 = boto3.client('s3')
        read_from_file = s3.get_object(Bucket=bucket_name, Key=s3_vocab_file_name)
        data = read_from_file["Body"].read().decode('UTF-8')
        word_list = data.split("\n")
        random_word = get_random_item(word_list)
        print("Random word:", random_word)

        # send text message to phone
        message = random_word
        subject = "Daily English Word"
        sns_result = send_sns(message, subject)
        return sns_result
    except Exception as err:
        print (err)

Note: make sure the lambda role has permissions to access S3 and SNS

Step 4: Create an EventBridge schedule to send email daily

Step 5: Check the email (set the schedule to send an email every min to test)