Serverless for (JavaScript) Developers

London JavaScript Community, February 7th, 2017

Serverless architectures simplify operations and maintenance of production applications, abstracting from the underlining infrastructure and OS. But what about development?

We are now two years in with tools such as AWS Lambda and what are the best practices to share from a development perspective?

In this session you will see some of the key points that can empower a JavaScript developer!

Transcript

1. Serverless for
   (JavaScript)
   Developers
   Danilo Poccia
   @danilop danilop
   Technical Evangelist
   

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2. Danilo Poccia
   With AWS Lambda, you write your code and upload it to
   the AWS cloud. AWS Lambda responds to the events
   triggered by your application or your users, and auto-
   matically manages the underlying computer resources for you.
   Back-end tasks like analyzing a new document or processing
   requests from a mobile app are easy to implement. Your ap-
   plication is divided into small functions, leading naturally to a
   reactive architecture and the adoption of microservices.
   AWS Lambda in Action is an example-driven tutorial that
   teaches you how to build applications that use an event-driven
   approach on the back-end. Starting with an overview of AWS
   Lambda, the book moves on to show you common examples
   and patterns that you can use to call Lambda functions from
   a web page or a mobile app. The second part of the book puts
   these smaller examples together to build larger applications.
   By the end, you’ll be ready to create applications that take
   advantage of the high availability, security, performance, and
   scalability of AWS.
   What’s Inside
   ●
   Create a simple API
   ●
   Create an event-driven media sharing application
   ●
   Secure access to your application in the cloud
   ●
   Use functions from different clients like web pages
   or mobile apps
   ●
   Connect your application with external services
   Requires basic knowledge of JavaScript. Some examples are
   also provided in Python. No AWS experience is assumed.
   Danilo Poccia is a technical evangelist at Amazon Web Services
   and a frequent speaker at public events and workshops.
   To download their free eBook in PDF, ePub, and Kindle formats, owners
   of this book should visit www.manning.com/books/aws-lambda-in-action
   $49.99 / Can $57.99 [INCLUDING eBOOK]
   AWS Lambda IN ACTION
   SOFTWARE DEVELOPMENT/CLOUD
   Danilo
   Poccia
   M A N N I N G
   AWS Lambda IN ACTION
   MANNING
   “Clear and concise …
   the code samples are as well
   structured as the writing.”
   —From the Foreword by
   James Governor, RedMonk
   “A superb guide to an
   important aspect of AWS.”
   —Ben Leibert, VillageReach
   “Step-by-step examples
   and clear prose make this
   the go-to book for
   AWS Lambda!.”
   —Dan Kacenjar, Wolters Kluwer
   “Like Lambda itself, this
   book is easy to follow, concise,
   and very functional.”
   —Christopher Haupt, New Relic
   M A N N I N G
   SEE INSERT
   Danilo Poccia
   FOREWORD BY James Governor
   Event-driven serverless applications
   

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3. Function
   

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4. 
   greetingsOnDemand
   
   

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5. Function
   

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6. Function
   

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7. Client Application
   Function
   invoke
   

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8. Client Application
   Function
   Database
   Files
   invoke
   read/write
   

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9. Client Application
   Function2
   Database
   Files
   Function1
   Function3
   invoke
   event trigger
   event trigger
   read/write
   

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10. Business Logic
    Client Application
    Function2
    Database
    Files
    Function1
    Function3
    invoke
    event trigger
    event trigger
    read/write
    

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11. Data Persistence
    Business Logic
    Client Application
    Function2
    Database
    Files
    Function1
    Function3
    invoke
    event trigger
    event trigger
    read/write
    

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12. Data Persistence
    Business Logic
    Client
    Application
    Functions
    Functions
    Functions Repositories
    Repositories
    Repositories
    API read/write
    event trigger
    

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13. Data Persistence
    Business Logic
    Client
    Application
    Functions
    Functions
    Functions Repositories
    Repositories
    Repositories
    API read/write
    event trigger
    read/write
    

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14. Data Persistence
    Business Logic
    Client
    Application
    Functions
    Functions
    Functions
    API
    Gateway
    Repositories
    Repositories
    Repositories
    API read/write
    event trigger
    read/write
    

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15. 
    greetingsAPI
    
    

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16. How do I start?
    

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17. No Servers
    to Manage
    Continuous
    Scaling
    Subsecond
    Metering
    AWS Lambda
    

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18. 1 Million requests
    per month
    400,000 GB-seconds
    per month
    Free Tier
    AWS Lambda
    

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19. https://github.com/awslabs/aws-serverless-auth-reference-app
    Serverless reference app and backend API, showcasing authentication and
    authorization patterns using Amazon Cognito, Amazon API Gateway, AWS
    Lambda, and AWS IAM
    

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20. 
    aws-serverless-auth-reference-app
    
    

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21. https://serverless.com
    

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22. Building An Infinitely Scalable Online Recording Campaign
    For David Guetta & UEFA
    

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23. Do I need to rebuild everything?
    

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24. https://github.com/awslabs/aws-serverless-express
    This library enables you to utilize AWS Lambda and Amazon API Gateway to
    respond to web and API requests using your existing Node.js application
    framework
    

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25. 
    aws-serverless-express
    
    

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26. How to go beyond the timeout?
    

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27. function processList(itemList, context) {
    var item = itemList.shift();
    processItem(item, () => {
    if (itemList.length === 0) {
    console.log('Finished');
    } else if (context.getRemainingTimeInMillis() > TIME_THRESHOLD) {
    // Process remaning items
    processList(itemList, context);
    } else {
    console.log('Not finished');
    // Time is running out,
    // invoke self asynchrounously to process remaning items
    invokeSelf(itemList, context);
    }
    });
    }
    

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28. What about larger apps?
    

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29. https://github.com/awslabs/serverless-application-model
    

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30. >
    Serverless Continuous Integration and Deployment
    GitHub
    Amazon S3
    AWS CodeCommit
    AWS CodeBuild AWS CodeBuild
    third-party tools
    AWS CloudFormation
    Commit Build Test
    Deploy
    to Prod
    AWS CodePipeline + SAM
    

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31. 
    serverless-application-model
    
    

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32. AWS Step Functions
    Sequential
    Steps
    Branching Steps
    (Choice of Path)
    Parallel
    Steps
    

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33. https://states-language.net/spec.html
    

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34. 
    AWS Step Functions
    
    

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35. Event-Driven Architecture
    

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36. Name
    Email
    Create New User
    Submit
    Check the “Name” syntax is right
    (only letters and spaces)
    Check the “Email” syntax is right
    (something@some.domain)
    Create the new user using
    provided Name and Email
    User Interface Actions
    

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37. Name
    Email
    Create New User
    Submit
    Check the “Name” syntax is right
    (only letters and spaces)
    Check the “Email” syntax is right
    (something@some.domain)
    Create the new user using
    provided Name and Email
    User Interface Actions
    Observers
    Target Action
    

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38. Generate thumbnails
    Keep another database in sync
    Process streaming data
    Services Functions
    Platform
    Target Action
    Kinesis
    Stream
    DynamoDB
    Table
    S3
    Bucket
    

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39. area = length x width
    

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40. area = length x width
    Procedural Programming
    “This is a function!”
    

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41. area = length x width
    Procedural Programming
    “This is a function!”
    Reactive Programming
    “This is data binding!”
    

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42. A B
    Event-Driven Design
    For Services
    ”Service A triggers B"
    or better
    ”Service B is caused by A"
    

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43. A B
    C
    D
    E
    F
    ?
    ?
    What is causing
    services E and F?
    

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44. A B
    C
    D
    E
    F
    New services (E, F)
    are triggered caused by C
    

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45. A B
    C
    D
    E
    F
    It can be cyclic
    Think of
    acknowledgements
    

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46. Each service
    has local visibility
    A B
    C
    D
    E
    F
    

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47. What I need to know
    (input events)
    1
    A B
    C
    D
    E
    F
    

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48. What I need to do
    (internal logic)
    2
    A B
    C
    D
    E
    F
    

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49. Who I need to notify
    (output events)
    3
    A B
    C
    D
    E
    F
    

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50. Who I need to notify
    (output events)
    What I need to know
    (input events)
    What I need to do
    (internal logic)
    1
    2
    3
    B
    

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51. Distributed Data Flow
    Vs
    Centralised Workflow
    

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52. Choreography
    Vs
    Orchestration
    

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53. Microservices
    Distributed Systems
    

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54. Monolith
    Service
    Service
    μ
    μ
    μ
    space (distribution, mobility)
    time (concurrency, latency)
    μ
    μ
    μ
    μ
    “Distributed
    in Time and Space”
    [Jonas Bonér]
    

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55. “…a diagram of
    two microservices
    and their shared database”
    Data should drive
    the boundaries
    

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56. A
    C
    I
    D
    tomic
    onsistent
    solated
    urable
    

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57. A
    C
    I
    D
    tomic
    onsistent
    solated
    urable
    A
    C
    I
    D
    ssociative
    ommutative
    dempotent
    istributed
    ACID 2.0
    

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58. Scale
    from Prototype to Production
    

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59. Responsive
    Resilient
    Elastic
    Message Driven
    The Reactive Manifesto
    

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60. Asynchronous
    communication
    is not enforced
    by serverless architectures
    Responsive
    Resilient
    Elastic
    Message Driven
    The Reactive Manifesto
    

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61. Lambda Everywhere
    

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62. AWS Greengrass
    

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63. AWS Snowball Edge
    

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64. AWS Snowball Edge
    

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65. AWS Snowmobile
    

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66. Lambda@Edge
    

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67. Build Apps With Services,
    Not Servers
    

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68. https://aws.amazon.com/lambda
    https://github.com/awslabs/aws-serverless-auth-reference-app
    https://github.com/awslabs/aws-serverless-express
    https://serverless.com
    https://github.com/awslabs/serverless-application-model
    https://states-language.net/spec.html
    https://github.com/danilop/AWS_Lambda_in_Action
    For Your Reference
    

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69. Thank You!
    Danilo Poccia
    @danilop danilop
    Technical Evangelist
    

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