Introduction

A multipurpose backend server api to send mail, text, slack, push, telegram etc. developed in Go

Design Goals

• Should be Simple and Easy to build hence Go programming language is selected
• Deployment shouod be xcopy and cross platform, Go meets this out of the box
• Should be serverless lambdas function but should impose any AWS or Azure style coding. Apex Gateway solves this.
• CI/CD should be out of the box without writing any code like Github actions, Lambda deployment etc. Netlify takes care of this
• Log analysis and debug capabilities - suppoered using custom Go logger which Netlify exposes thru GUI.
• Maintenance cost should be $0. Yes, everything should be Free

Pre-requisites

• Should have Go installed in your local development environment
• Optional netlify account to deploy the golang api's as serverless functions
• Optional netlify CLI
• Optional if you want to send HTML formatted email using mailgun template. I used Maizzle to build HTML emails with Tailwind CSS https://maizzle.com/
• mailgun account as the notify (sendmail) api is built using mailgun
• VSCode Editor or Gitpod online VSCode editor 50 hours per month free plan

Local Development

Clone repository.

git clone https://github.com/senthilsweb/zygo.git

Local build (Mac OS)

go build

Local Run

./zygo -p "3000"

Available REST API Endpoints

The following APIs implemented and readily available to use in your projects

https://zybes.netlify.app/api

Request	Endpoints	Functionality
POST	https://zybes.netlify.app/api/notify/mailgun	Send email
GET	https://zybes.netlify.app/api/ping	Health check

Payload for https://zybes.netlify.app/api/notify/mailgun

{
    "message": {
        "subject": "This is subject",
        "body": "This is body",
        "template": "welcome_email",
        "recipient": "name <your email@gmail.com>",
        "payload": {"name":"John Smith"}
    },
    "MAILGUN_DOMAIN": "your domain",
    "MAILGUN_KEY": "your key",
    "EMAIL_SENDER": "Mailgun Sandbox <your sender>"
}

Netlify Deployment

Refer the following documentaion and blog post to host the server (and optional Single Page Application) at Netlify

• Netlify documentaion
• blog post by Carl M. Johnson

Key Frameworks and Libraries used

• github.com/apex/gateway
• github.com/gin-gonic/gin
• github.com/mailgun/mailgun-go/v4
• github.com/sirupsen/logrus
• github.com/spf13/viper
• github.com/tidwall/gjson