sendgrid

README

This library allows you to quickly and easily use the Twilio SendGrid Web API v3 via Go.

Version 3.X.X of this library provides full support for all Twilio SendGrid Web API v3 endpoints, including the new v3 /mail/send.

This library represents the beginning of a new path for Twilio SendGrid. We want this library to be community driven and Twilio SendGrid led. We need your help to realize this goal. To help make sure we are building the right things in the right order, we ask that you create issues and pull requests or simply upvote or comment on existing issues or pull requests.

If you need help using SendGrid, please check the Twilio SendGrid Support Help Center.

Table of Contents

• Installation
• Quick Start
• Processing Inbound Email
• Usage
• Use Cases
• Announcements
• How to Contribute
• Troubleshooting
• About
• License

Installation

Supported Versions

This library supports the following Go implementations:

• Go 1.14
• Go 1.15
• Go 1.16
• Go 1.17
• Go 1.18
• Go 1.19

Prerequisites

• The Twilio SendGrid service, starting at the free level, to send up to 40,000 emails for the first 30 days, then send 100 emails/day free forever or check out our pricing.

Setup Environment Variables

Update the development environment with your SENDGRID_API_KEY, for example:

echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env
echo "sendgrid.env" >> .gitignore
source ./sendgrid.env

Install Package

go get github.com/sendgrid/sendgrid-go

Dependencies

• rest

Setup Environment Variables

Initial Setup

cp .env_sample .env

Environment Variable

Update the development environment with your SENDGRID_API_KEY, for example:

echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env
echo "sendgrid.env" >> .gitignore
source ./sendgrid.env

Quick Start

Hello Email

The following is the minimum needed code to send an email with the /mail/send Helper (here is a full example):

With Mail Helper Class

package main

import (
	"fmt"
	"log"
	"os"

	"github.com/sendgrid/sendgrid-go"
	"github.com/sendgrid/sendgrid-go/helpers/mail"
)

func main() {
	from := mail.NewEmail("Example User", "test@example.com")
	subject := "Sending with Twilio SendGrid is Fun"
	to := mail.NewEmail("Example User", "test@example.com")
	plainTextContent := "and easy to do anywhere, even with Go"
	htmlContent := "<strong>and easy to do anywhere, even with Go</strong>"
	message := mail.NewSingleEmail(from, subject, to, plainTextContent, htmlContent)
	client := sendgrid.NewSendClient(os.Getenv("SENDGRID_API_KEY"))
	response, err := client.Send(message)
	if err != nil {
		log.Println(err)
	} else {
		fmt.Println(response.StatusCode)
		fmt.Println(response.Body)
		fmt.Println(response.Headers)
	}
}

The NewEmail constructor creates a personalization object for you. Here is an example of how to add to it.

Without Mail Helper Class

The following is the minimum needed code to send an email without the /mail/send Helper (here is a full example):

package main

import (
	"fmt"
	"github.com/sendgrid/sendgrid-go"
	"log"
	"os"
)

func main() {
	request := sendgrid.GetRequest(os.Getenv("SENDGRID_API_KEY"), "/v3/mail/send", "https://api.sendgrid.com")
	request.Method = "POST"
	request.Body = []byte(` {
	"personalizations": [
		{
			"to": [
				{
					"email": "test@example.com"
				}
			],
			"subject": "Sending with Twilio SendGrid is Fun"
		}
	],
	"from": {
		"email": "test@example.com"
	},
	"content": [
		{
			"type": "text/plain",
			"value": "and easy to do anywhere, even with Go"
		}
	]
}`)
	response, err := sendgrid.API(request)
	if err != nil {
		log.Println(err)
	} else {
		fmt.Println(response.StatusCode)
		fmt.Println(response.Body)
		fmt.Println(response.Headers)
	}
}

General v3 Web API Usage

package main

import (
	"fmt"
	"github.com/sendgrid/sendgrid-go"
	"log"
	"os"
)

func main() {
	request := sendgrid.GetRequest(os.Getenv("SENDGRID_API_KEY"), "/v3/api_keys", "https://api.sendgrid.com")
	request.Method = "GET"

	response, err := sendgrid.API(request)
	if err != nil {
		log.Println(err)
	} else {
		fmt.Println(response.StatusCode)
		fmt.Println(response.Body)
		fmt.Println(response.Headers)
	}
}

Processing Inbound Email

Please see our helper for utilizing our Inbound Parse webhook.

Usage

• Twilio SendGrid Docs
• Library Usage Docs
• Example Code
• How-to: Migration from v2 to v3
• v3 Web API Mail Send Helper

Use Cases

Examples of common API use cases, such as how to send an email with a transactional template.

Announcements

All updates to this library are documented in our CHANGELOG and releases.

How to Contribute

We encourage contribution to our libraries (you might even score some nifty swag), please see our CONTRIBUTING guide for details.

Quick links:

• Feature Request
• Bug Reports
• Improvements to the Codebase
• Review Pull Requests

Troubleshooting

Please see our troubleshooting guide for common library issues.

About

sendgrid-go is maintained and funded by Twilio SendGrid, Inc. The names and logos for sendgrid-go are trademarks of Twilio SendGrid, Inc.

Support

If you need help using SendGrid, please check the Twilio SendGrid Support Help Center.

License

The MIT License (MIT)

Documentation

Index

• Constants
• Variables
• func API(request rest.Request) (*rest.Response, error)
• func GetRequest(key, endpoint, host string) rest.Request
• func GetRequestSubuser(key, endpoint, host, subuser string) rest.Request
• func GetTwilioEmailRequest(twilioEmailOptions TwilioEmailOptions) rest.Request
• func MakeRequest(request rest.Request) (*rest.Response, error)
• func MakeRequestAsync(request rest.Request) (chan *rest.Response, chan error)
• func MakeRequestAsyncWithContext(ctx context.Context, request rest.Request) (chan *rest.Response, chan error)
• func MakeRequestRetry(request rest.Request) (*rest.Response, error)
• func MakeRequestRetryWithContext(ctx context.Context, request rest.Request) (*rest.Response, error)
• func MakeRequestWithContext(ctx context.Context, request rest.Request) (*rest.Response, error)
• func SetDataResidency(request rest.Request, region string) (rest.Request, error)
• type Client
  • func NewSendClient(key string) *Client
  • func NewTwilioEmailSendClient(username, password string) *Client
  • func (cl *Client) Send(email *mail.SGMailV3) (*rest.Response, error)
  • func (cl *Client) SendWithContext(ctx context.Context, email *mail.SGMailV3) (*rest.Response, error)
• type TwilioEmailOptions

Constants

const (
	Version = "3.14.0"
)

Version is this client library's current version

Variables

var DefaultClient = rest.DefaultClient

DefaultClient is used if no custom HTTP client is defined

Functions

func API

func API(request rest.Request) (*rest.Response, error)

API sets up the request to the Twilio SendGrid API, this is main interface. Please use the MakeRequest or MakeRequestAsync functions instead. (deprecated)

func GetRequest

func GetRequest(key, endpoint, host string) rest.Request

GetRequest @return [Request] a default request object

func GetRequestSubuser

func GetRequestSubuser(key, endpoint, host, subuser string) rest.Request

GetRequestSubuser like GetRequest but with On-Behalf of Subuser @return [Request] a default request object

func GetTwilioEmailRequest

func GetTwilioEmailRequest(twilioEmailOptions TwilioEmailOptions) rest.Request

GetTwilioEmailRequest create Request @return [Request] a default request object

func MakeRequest

func MakeRequest(request rest.Request) (*rest.Response, error)

MakeRequest attempts a Twilio SendGrid request synchronously.

func MakeRequestAsync

func MakeRequestAsync(request rest.Request) (chan *rest.Response, chan error)

MakeRequestAsync attempts a request asynchronously in a new go routine. This function returns two channels: responses and errors. This function will retry in the case of a rate limit.

func MakeRequestAsyncWithContext

func MakeRequestAsyncWithContext(ctx context.Context, request rest.Request) (chan *rest.Response, chan error)

MakeRequestAsyncWithContext attempts a request asynchronously in a new go routine with context.Context. This function returns two channels: responses and errors. This function will retry in the case of a rate limit.

func MakeRequestRetry

func MakeRequestRetry(request rest.Request) (*rest.Response, error)

MakeRequestRetry a synchronous request, but retry in the event of a rate limited response.

func MakeRequestRetryWithContext

func MakeRequestRetryWithContext(ctx context.Context, request rest.Request) (*rest.Response, error)

MakeRequestRetryWithContext a synchronous request with context.Context, but retry in the event of a rate limited response.

func MakeRequestWithContext

func MakeRequestWithContext(ctx context.Context, request rest.Request) (*rest.Response, error)

MakeRequestWithContext attempts a Twilio SendGrid request synchronously with context.Context.

func SetDataResidency

func SetDataResidency(request rest.Request, region string) (rest.Request, error)

SetDataResidency modifies the host as per the region

• This allows support for global and eu regions only. This set will likely expand in the future.
• Global should be the default
• Global region means the message should be sent through:
• HTTP: api.sendgrid.com
• EU region means the message should be sent through:
• HTTP: api.eu.sendgrid.com

@return [Request] the modified request object

Types

type Client

type Client struct {
	rest.Request
}

Client is the Twilio SendGrid Go client

func NewSendClient

func NewSendClient(key string) *Client

NewSendClient constructs a new Twilio SendGrid client given an API key

func NewTwilioEmailSendClient

func NewTwilioEmailSendClient(username, password string) *Client

NewTwilioEmailSendClient constructs a new Twilio Email client given a username and password

func (*Client) Send

func (cl *Client) Send(email *mail.SGMailV3) (*rest.Response, error)

Send sends an email through Twilio SendGrid

func (*Client) SendWithContext

func (cl *Client) SendWithContext(ctx context.Context, email *mail.SGMailV3) (*rest.Response, error)

SendWithContext sends an email through Twilio SendGrid with context.Context.

type TwilioEmailOptions

type TwilioEmailOptions struct {
	Username string
	Password string
	Endpoint string
	Host     string
}

TwilioEmailOptions for GetTwilioEmailRequest