Скачать или смотреть AWS Begineers Bootcamp - Week 3 - Build CRUD API using Dynamo DB, API GateWay and Lambda

Following up from Week1 and Week2 .. This week we will explore.
1. DynamoDB
2. API Gateway
3. Lambda Functions

Project - CRUD APIs for retrieving and updating items in DB
Create a table in DynamoDB
Write a Lambda Function as a Backend
Configure API Endpoints on API GATEWay
Get /items
Put /items
Get /items/{id}
Delete /items/{id}
Configure API Endpoints with Lambda Code
Test Out APIs through Curl and Browser.

Lambda Code

import json
import boto3
from decimal import Decimal

client = boto3.client('dynamodb')
dynamodb = boto3.resource("dynamodb")
table = dynamodb.Table('crud-table')
tableName = 'crud-table'


def lambda_handler(event, context):
print(event)
body = {}
statusCode = 200
headers = {
"Content-Type": "application/json"
}

try:
if event['routeKey'] == "DELETE /items/{id}":
table.delete_item(
Key={'id': event['pathParameters']['id']})
body = 'Deleted item ' + event['pathParameters']['id']
elif event['routeKey'] == "GET /items/{id}":
body = table.get_item(
Key={'id': event['pathParameters']['id']})
body = body["Item"]
responseBody = [
{'price': float(body['price']), 'id': body['id'], 'name': body['name']}]
body = responseBody
elif event['routeKey'] == "GET /items":
body = table.scan()
body = body["Items"]
print("ITEMS----")
print(body)
responseBody = []
for items in body:
responseItems = [
{'price': float(items['price']), 'id': items['id'], 'name': items['name']}]
responseBody.append(responseItems)
body = responseBody
elif event['routeKey'] == "PUT /items":
requestJSON = json.loads(event['body'])
table.put_item(
Item={
'id': requestJSON['id'],
'price': Decimal(str(requestJSON['price'])),
'name': requestJSON['name']
})
body = 'Put item ' + requestJSON['id']
except KeyError:
statusCode = 400
body = 'Unsupported route: ' + event['routeKey']
body = json.dumps(body)
res = {
"statusCode": statusCode,
"headers": {
"Content-Type": "application/json"
},
"body": body
}
return res