feat(service): add twilio

[svaloumas]

Description

Adds Twilio (Messaging) service.

Resolves #115

Motivation and Context

Adds a new service to the list of the currently supported ones.

How Has This Been Tested?

Unit tests implemented under service/twilio/twilio_test.go.

Integration tests have been performed using a trial account from Twilio Console.

Sample code to run an integration test.

package main

import (
	"context"
	"log"

	"github.com/nikoksr/notify"
	"github.com/nikoksr/notify/service/twilio"
)

func main() {
	twilioSvc, err := twilio.New("account_sid", "auth_token", "your_phone_number")
	if err != nil {
		log.Fatalf("twilio.New() failed: %s", err.Error())
	}

	twilioSvc.AddReceivers("recipient_phone_number")

	notifier := notify.New()
	notifier.UseServices(twilioSvc)

	err = notifier.Send(context.Background(), "subject", "message")
	if err != nil {
		log.Fatalf("notifier.Send() failed: %s", err.Error())
	}

	log.Println("notification sent")
}

Please find below sample images from the results of the integration tests.

Screenshots / Output (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #276 (2879767) into main (836eb8a) will increase coverage by 0.81%.
The diff coverage is 64.58%.

@@            Coverage Diff             @@
##             main     #276      +/-   ##
==========================================
+ Coverage   54.62%   55.44%   +0.81%     
==========================================
  Files          14       16       +2     
  Lines         540      588      +48     
==========================================
+ Hits          295      326      +31     
- Misses        222      235      +13     
- Partials       23       27       +4     

Impacted Files	Coverage Δ
service/twilio/twilio.go	56.00% <56.00%> (ø)
service/twilio/mock_twilioClient.go	73.91% <73.91%> (ø)

---

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[emmanuelay]

Why is this not accepted @nikoksr ?

[nikoksr]

@svaloumas so sorry for the severe delay! I fixed all compatibility issues with main and it looks like we're read to merge.

Since I updated this branche's go.mod, I'd be very thankful if you could quickly verify that the Twillio service you wrote is actually still working with the latest changes.

I greatly appreciate your patience and effort!

[svaloumas]

Hey @nikoksr, no worries at all! I've just tested it once again after pulling your changes and it's still functional. 😄