http

Generic HTTP service

Prerequisites

Technically, you don't need any prerequisites to use this service. However, you will need an HTTP endpoint to send requests to.

See our Notify Test Server for a simple HTTP server that can be used for testing.

Usage

package main

import (
	"context"
	"log"
	stdhttp "net/http"

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

func main() {
	// Create http service
	httpService := http.New()

	//
	// In the following example, we will send two requests to the same HTTP endpoint. This is meant to be used with
	// Notify's test http server: https://github.com/nikoksr/notify-http-test. It supports multiple content-types on the
	// same endpoint, to simplify testing. All you have to do is run `go run main.go` in the test server's directory and
	// this example will work.
	// So the following example should send two requests to the same endpoint, one with content-type application/json and
	// one with content-type text/plain. The requests should be logged differently by the test server since we provide
	// a custom payload builder func for the second webhook.

	// Add a default webhook; this uses application/json as content type and POST as request method.
	httpService.AddReceiversURLs("http://localhost:8080")

	// Add a custom webhook; the build payload function is used to build the payload that will be sent to the receiver
	// from the given subject and message.
	httpService.AddReceivers(&http.Webhook{
		URL:         "http://localhost:8080",
		Header:      stdhttp.Header{},
		ContentType: "text/plain",
		Method:      stdhttp.MethodPost,
		BuildPayload: func(subject, message string) (payload any) {
			return "[text/plain]: " + subject + " - " + message
		},
	})

	//
	// NOTE: In case of an unsupported content type, we could provide a custom marshaller here.
	// See http.Service.Serializer and http.defaultMarshaller.Marshal for details.
	//

	// Add pre-send hook to log the request before it is sent.
	httpService.PreSend(func(ctx context.Context, req *stdhttp.Request) error {
		log.Printf("Sending request to %s", req.URL)
		return nil
	})

	// Add post-send hook to log the response after it is received.
	httpService.PostSend(func(ctx context.Context, req *stdhttp.Request, resp *stdhttp.Response) error {
		log.Printf("Received response from %s", resp.Request.URL)
		return nil
	})

	// Create the notifier and use the HTTP service
	n := notify.NewWithServices(httpService)

	// Send a test message.
	if err := n.Send(context.Background(), "Testing new features", "Notify's HTTP service is here."); err != nil {
		log.Fatal(err)
	}
}