serverless - send email and update status

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Serverless Anna Su Send Email and update status

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Why not VM 即使 server 沒有收到任何 request ，還是會被收取費⽤用必須設定與持續管理理 Server 需要經常更更新 Server，避免安全性問題當我們使⽤用量量變⼤大時，需要管理理 server 的 scaling up  如果使⽤用量量變低時，也需要 scaling down

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Why Serverless ⾃自動擴展依照使⽤用量量付費開發速度更更快零管理理

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You don’t have to think about those servers. You just focus on code.

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What’s Serverless Serverless is an execution model where the cloud provider is responsible for executing a piece of code by dynamically allocating the resources.

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What’s Serverless The code is typically run inside stateless containers. Can be triggered by a variety of events including http requests, database events, monitoring alerts, ﬁle uploads, scheduled events, etc

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How Serverless Works @aws Upload your code to AWS Lambda Set up your code to trigger from other AWS services, HTTP endpoints, or in-app activity Lambda runs your code only when triggered, using only the compute resources needed Pay just for the compute time you use

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Install Serverless npm install -g serverless

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Deploy a Node.js function to AWS Lambda

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sls

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sls create -t aws-nodejs

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brew install awscli

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aws conﬁgure

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module.exports.hello = async (event) => { return { statusCode: 200, body: JSON.stringify({ message: 'Go Serverless v1.0! Your function executed successfully!', input: event, }), }; }; handler.js

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service: aws-nodejs-demo  provider: name: aws runtime: nodejs8.10  functions: hello: handler: handler.hello events: - http: path: / method: get serverless.yml

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sls deploy

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Serverless Project for Email

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HASURA SendGrid AWS Lambda Using

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HASURA build GraphQL apps backed by Postgres

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HASURA Event trigger

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SendGrid email service trusted by developers and marketers

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AWS Lambda run code without thinking about servers

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Send Email HASURA event trigger webhook Serverless AWS Lambda

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Update Email Status notiﬁcation webhook Serverless AWS Lambda

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Email Flow HASURA Realtime Serverless Send email HASURA Event SendGrid Event Notiﬁcation SendGrid Serverless Update email

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Send Email Flow HASURA Realtime Serverless Send email HASURA Event SendGrid

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Create HASURA Table

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Creating an event-trigger to listen to a database change on Postgres

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Create Serverless (Send Email) const sgMail = require('@sendgrid/mail'); module.exports.run = async event => { try { let { table: { name: table_name, schema }, event: { data: { new: { to, from, subject, content: html, id }, }, }, } = JSON.parse(event.body); sgMail.setApiKey(process.env.SENDGRID_API_KEY);

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SendGrid Settings

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AWS Lambda Settings

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Update Email Status Flow HASURA Realtime Serverless Send email HASURA Event SendGrid Event Notiﬁcation SendGrid Serverless Update email

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Create Serverless (Update Email) const axios = require('axios'); module.exports.run = async event => { try { const body = JSON.parse(event.body); const { id, event: status, schema, table_name } = body[body.length - 1]; await axios({ method: 'post', headers: { 'x-hasura-admin-secret': process.env.HASURA_SECRET, }, url: process.env.HASURA_URL, data: { variables: {

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AWS Lambda Settings

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SendGrid Settings

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provider: functions: sendEmailFromHasura: handler: sendEmailFromHasura.run events: - http: path: send-email-from-hasura method: post updateHasuraEmailStatus: handler: updateHasuraEmailStatus.run events: - http: path: update-hasura-email-status method: post plugins: - serverless-plugin-monorepo serverless.yml

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sls deploy

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AWS Lambda function

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Reference https://serverless.com/ https://aws.amazon.com/tw/lambda/ Develop a Serveerless Backend using Node.js on AWS Lambda What is Serverless ? Serverless overview What is Serverless Architecture? https://www.ﬂaticon.com

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Thanks Anna Su