Serverless Workshop - Tomato Restaurant Rating App

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Building a completely serverless restaurant rating app - 'Tomato Restaurant Rating' app using AWS services - Lambda, API Gateway, DynamoDB, Cognito and servereless framework.

Software

Serverless on AWS:
‘Tomato’ Restaurant
Rating App

Srushith Repakula
Co-Founder, Head of Engineering at KonfHub
Serverless Consultant
Co-organiser of one of the largest Serverless
meetup group - Serverless Architecture Meetup
Group, Bangalore
Mentor at GirlScript Bangalore
@SrushithR

Dharmendra Negi
Platform Engineer at KonfHub
@Dharm_snegi

Physical Virtualisation Cloud Containers
Evolution of Serverless
`
Serverless

Event
sources
Trigger
other
services
Lambda
function
s
Working with Lambdas

The function lifecycle
Bootstrap the
runtime
Start your
code
Partial
cold start
Download
your code
Start new
Execution
environment
Full cold
start
AWS optimization
Warm start
Your optimization
Content Source: ReInvent talk - https://www.youtube.com/watch?v=5rMiq-jw1Ig

Lambda execution model
Synchronous
(push)
Asynchronous
(event)
Stream
(Poll-based)
/order
Amazon
API
Gateway
Lambda
function
Amazon
DynamoDB
Amazon
Kinesis
changes
Amazon
SNS
Amazon
S3
reqs
Lambda
function
Lambda
function
Content Source: ReInvent talk - https://www.youtube.com/watch?v=5rMiq-jw1Ig

Your
function
Language
runtime
Execution
environment
Lambda
service
Compute
substrate
Anatomy of Lambda
Content source: ReInvent talk - https://www.youtube.com/watch?v=5rMiq-jw1Ig

01
02
03
04
Parts of lambda
function code
Dependencies, configuration
information
(Impact on cold start!)
Your handler code
Common helper
functions
Business logic
subfunctions

Handler() function
Function to be
executed upon
invocation
Anatomy of Lambda
function
Event object
Data sent during
Lambda function
invocation
Context object
Methods available to
interact with runtime
information (request
ID,
log group, more)

Lets SNAP a few
servers out and tilt the
world back to balance!

Img source: https://medium.com/@awskarthik82/part-1-securing-aws-api-gateway-using-aws-cognito-oauth2-scopes-410e7fb4a4c0

● If you have steady, predictable traffic, choose reserved capacity. Since you know you need a
certain amount of capacity at all times, you can save from reduced rates.
● If you have variable, predictable traffic, choose provisioned capacity. Imagine you have significant
traffic during the day but no traffic overnight. Reserved capacity would be wasted overnight, but
your patterns are predictable enough that you could scale up your provisioned capacity when you
need it.
● If you have variable, unpredictable traffic, choose on-demand. If your application gets random
spikes, it can be hard to provision capacity to match demand. Use the on-demand feature so you
don't throttle your users.
Understanding DynamoDB pricing

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Srushith Repakula

Scheduled Retweets Using AWS Lambda

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This document provides an overview of AWS Lambda and serverless computing. It discusses key Lambda features like automatic scaling, integrated security model, and pay per use model. It demonstrates how to develop, deploy and test Lambda functions using the AWS console, SDKs and CLI. The document also covers Lambda execution environment, logging, integration with other AWS services, common use cases and provides a demo of building a Lambda function to auto retweet from Twitter.

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Serverless: Why is it hot and What is it not?

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Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry. Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events. With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use. Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements. If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io

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