January 9th, 2020

  1. Coded a function in the lambda function get_user_info that returns a row from our chocolate_user DynamoDB

2. Tested my code and it correctly outputted the row I had selected in DynamoDB (user: John Smith) Output: {‘Item’: {‘last_name’: ‘Smith’, ‘email’: ‘john.smith@gmail.com’, ‘first_name’: ‘John’, ‘age’: Decimal(‘35’)}

3. Did a second test with a different row, it was a success (user: Jane Smith) Output:{‘Item’: {‘last_name’: ‘Smith’, ‘email’: ‘jane.smith@gmail.com’, ‘first_name’: ‘Jane’, ‘age’: Decimal(‘25’)}

  1. Changed code so that an incorrect email will result in a blank row and a existing email will result in the output of the corresponding row

5. Next, I created a new API gateway, that is fully funtioning. When you enter a parameter, it outputs the corresponding information and when you enter NO parameter, there is a nice response. It is now published on the internet and later I will be able to use this URL while coding in HTML. URL:https://y8s2gy3mi8.execute-api.us-east-1.amazonaws.com/prod/user-profile?user_email=mr.coxall@mths.ca

  1. I altered my lambda code to trap errors with a try catch statement
  2. Used Javascript “Fetch” through index.html to call my API and present the data for “jane.smith@gmail.com” on my website
get_user_info.py Lambda function
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#!/usr/bin/env python3

# Created by: Trinity Armstrong
# Created on: Jan 2020
# This function returns a row from our chocolate_user DynamoDB

import json
import boto3
import decimal


def replace_decimals(obj):
        # Helper class to Decimals in an arbitrary object
        #   from: https://github.com/boto/boto3/issues/369

    if isinstance(obj, list):
        for i in range(len(obj)):
            obj[i] = replace_decimals(obj[i])
        return obj
    elif isinstance(obj, dict):
        for k, v in obj.items():
            obj[k] = replace_decimals(v)
        return obj
    elif isinstance(obj, set):
        return set(replace_decimals(i) for i in obj)
    elif isinstance(obj, decimal.Decimal):
        if obj % 1 == 0:
            return int(obj)
        else:
            return float(obj)
    else:
        return obj


def lambda_handler(event, context):
    # get a row from our chocolates_user table

    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('chocolate_users')
    response = table.get_item(
        Key = {
            'email':event['email_address']
        }
    )

    try:
        results = response["Item"]
        results = replace_decimals(results)
    except:
        results = {}

    return {
        'statusCode': 200,
        'body': json.dumps(results)
    }