WarsawJS Slides: Writing your first Amazon lambda using JS

Piotr Zientara

"Writing your first Amazon lambda using JS"

2016-09-14

@Piotr_Zientara

About me

2.5 years of experience as a fullstack dev at Rebased
WarsawJS organizer
former teacher and educator
Happy programmer at Jobartis we work at TechHub in Warsaw
Sometimes coach at RailsGirl and Rails Girls Summer of Code

Today morning...

This presentation plan

What is AWS Labmda?
How to implement it?
Evaluation of the tool

What is an AWS Lambda?

code that can be run on your behalf using AWS infrastructure
written in supported language (Node.js, Java, and Python)
that can be used as:
- event-driven compute service where AWS Lambda runs your code in response to events
- compute service to run your code in response to HTTP requests using Amazon API Gateway or API calls made using AWS SDKs.

How to start?

Have an AWS account
Have an idea
Have some time to read the docs or just listen to this presentation ;-)
the docs are here (with turorial)

How to start?

Have an AWS account
Have an idea
Have some time to read the docs or just listen to this presentation ;-)

Example lambda in Node.js

            
            'use strict';
            console.log('Loading event');

            exports.handler = function(event, context) {
              var hello = { "Hello":"World" }
              // SUCCESS with message
              context.done(null, hello);
            };

Another example with params

            
                console.log('Loading event');

                exports.myHandler = function(event, context, callback) {
                    console.log("value1 = " + event.key1);
                    console.log("value2 = " + event.key2);
                    callback(null, "some success message");
                    // or
                    // callback("some error type");
                })

What year do we have?

Why?

Let's follow this idea!

What is the year using in alterntive calendars? Eg. A.U.C. (Ab Urbe Condita), abbr. to Anno Urbis (AU) instead of post Christum natum abbr. to Anno Domini (AD)?
we can ask for year Ab WarsawJS Condita (WJS) with a parameter

Simple function with API Gateway (1/2)

Amazon Services > Lambda > Get started now
Configure function
- write the body of the function
- set the role
- create function
- test it
- remember the region where is is created!

Simple function with API Gateway (2/2)

Setup gateway
- API Gateway
- get started -> create Gateway
- resources -> create GET resource
- test it

Hold up! Live coding session!

What can go wrong? ;-)

Is coding like philosophy?

Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.

Ludwig Wittgenstein

What might go wrong?

buckets confusion
POST requests get JSON
getting lost in the docs
setting the access policy wrong
be disappointed with the tests results

What I was expecting to be different?

easier management / usage of the AWS console
why Amazon lambda is slow- my question on SO
free support from the AWS team

Examples of using

My case on production project

creating a ZIP archive form files on Amazon S3 bucket and giving a link to the user
performance is important
simplicity and scalability is important

Strong sides of Amazon Lambda

scalable
cheap - 1000 000 requests a month for free
independent

WarsawJS Slides: Writing your first Amazon lambda using JS

Piotr Zientara

"Writing your first Amazon lambda using JS"

2016-09-14

@Piotr_Zientara

About me

Today morning...

This presentation plan

What is an AWS Lambda?

How to start?

Other tutorials

How to start?

Example lambda in Node.js

Another example with params

What year do we have?

Why?

Let's follow this idea!

Simple function with API Gateway (1/2)

Simple function with API Gateway (2/2)

Hold up! Live coding session!

What can go wrong? ;-)

Is coding like philosophy?

What might go wrong?

What I was expecting to be different?

Examples of using

Strong sides of Amazon Lambda

Thanks for watching!

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This year organizers

See you next month at WarsawJS#26 (second Wednesday of October)