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shahidh_k Bangalore K8S Meetup Building Resilient and scalable backends using event-driven Serverless 1

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shahidh_k 2 I’m Shahidh

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shahidh_k The Problem 3

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shahidh_k Traditional architecture App Database API Payment microservice Restaurant microservice Delivery microservice 4 1. Scalable? 2. Resilient? 3. Fun?

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shahidh_k Moving towards scale & resilience 5

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shahidh_k Async architecture App Database API Event system Payment processing Restaurant approval Delivery assignment Async microservices 6

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shahidh_k Serverless 7

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shahidh_k Serverless $ cat index.js exports.function = (req, res) => { res.json({"message": "Hello World"}); } 8 $ serverless functions deploy hello_world --trigger-http https://serverless.functions.net/hello_world $ curl https://serverless.functions.net/hello_world {"message": "Hello World"}

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shahidh_k Scalable! ● No OPS ● No VMs to manage ● Don’t need to worry about scaling ● Just write the code ● Deploy ● Scale for “free” Graphic Source 9

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shahidh_k Resilient? ● Serverless functions are ephemeral ● No knowledge of state - async ● Trigger them on events ● Add retries to the mix ● We have resiliency 10

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shahidh_k Example: Food ordering app Column | Value -------------------+--------------------------------------- id | a705a43d-c55b-4a8a-ac16-80679bd02404 created_at | 2018-09-23 13:24:32.159024+00 user_id | eca786b6-73ae-44c7-b34f-1757af554464 is_validated | false is_paid | false is_approved | false is_agent_assigned | false 11

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shahidh_k Order state machine with serverless is_validated | false is_paid | false is_approved | false is_agent_assigned | false is_validated | true is_paid | false is_approved | false is_agent_assigned | false is_validated | true is_paid | true is_approved | false is_agent_assigned | false is_validated | true is_paid | true is_approved | true is_agent_assigned | false is_validated | true is_paid | true is_approved | true is_agent_assigned | true Checks payment New order Validate order Restaurant approval Agent assignment Completed 12

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shahidh_k The cost 13 App Database API Event system Payment processing Restaurant approval Delivery assignment Generic Event System Event system Async Serverless Fns Payment processing Restaurant approval Delivery assignment

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shahidh_k High level overview Database Event system Payment processing Restaurant approval Delivery assignment Async serverless functions A Database API layer Payment microservice Restaurant microservice Delivery microservice Synchronous logic Asynchronous logic 14

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shahidh_k However, there’s still one problem

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shahidh_k GraphQL 16

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shahidh_k Let’s say I want to build... 17

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shahidh_k With GraphQL ● Standardised spec ● All GraphQL Clients are compatible with all GraphQL Servers ● Client implementations available for all major platforms and frameworks ● Subscriptions: access to async info ● Less work for the developer 18

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shahidh_k GraphQL & Serverless architecture 19 App Database Payment processing Restaurant approval Delivery assignment Mutation/Subscriptions Async serverless functions

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shahidh_k Demo Time! 20

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shahidh_k Food ordering app 21 https://serverless-demo.hasura.app/

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shahidh_k Food ordering app - scalable 22 https://serverless-demo.hasura.app/analytics-app

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shahidh_k Food ordering app - resilient 23 https://github.com/shahidhk/hasura-serverless https://serverless-demo.hasura.app/console

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shahidh_k 24 Thanks Questions? Star us on GitHub https://github.com/hasura/graphql-engine