ric930-fake-smtp/main.go

package main

import (
	"errors"
	"flag"
	"fmt"
	"log"

	"github.com/kardianos/service"
)

type Program struct {
	smtpServer *SMTPServer
	webServer  *WebServer
}

func (p *Program) Start(
	s service.Service,
) error {
	if err := p.smtpServer.Start(); err != nil {
		return fmt.Errorf(
			"failed to start SMTP server: %w",
			err,
		)
	}

	if err := p.webServer.Start(); err != nil {
		if stopErr := p.smtpServer.Stop(); stopErr != nil {
			return errors.Join(
				fmt.Errorf(
					"failed to start web server: %w",
					err,
				),
				fmt.Errorf(
					"failed to stop SMTP server after web startup failure: %w",
					stopErr,
				),
			)
		}

		return fmt.Errorf(
			"failed to start web server: %w",
			err,
		)
	}

	return nil
}

func (p *Program) Stop(
	s service.Service,
) error {
	var errs []error

	if p.webServer != nil {
		if err := p.webServer.Stop(); err != nil {
			errs = append(
				errs,
				fmt.Errorf(
					"failed to stop web server: %w",
					err,
				),
			)
		}
	}

	if p.smtpServer != nil {
		if err := p.smtpServer.Stop(); err != nil {
			errs = append(
				errs,
				fmt.Errorf(
					"failed to stop SMTP server: %w",
					err,
				),
			)
		}
	}

	return errors.Join(errs...)
}

func main() {
	configPath := flag.String(
		"config",
		"config.yaml",
		"Path to YAML config file",
	)

	flag.Parse()

	cfg, err := LoadConfig(*configPath)
	if err != nil {
		log.Fatalf(
			"Failed to load config: %v",
			err,
		)
	}

	smtpServer := NewSMTPServer(cfg)

	webServer := NewWebServer(
		cfg,
		smtpServer,
	)

	svcConfig := &service.Config{
		Name: "ric930-fake-smtp",

		DisplayName: "Ric930 Fake SMTP Server",

		Description: "Fake SMTP server for testing with web interface",

		Arguments: []string{
			"-config",
			*configPath,
		},
	}

	prg := &Program{
		smtpServer: smtpServer,
		webServer:  webServer,
	}

	s, err := service.New(
		prg,
		svcConfig,
	)

	if err != nil {
		log.Fatal(err)
	}

	logger, err := s.Logger(nil)
	if err != nil {
		log.Fatal(err)
	}

	smtpServer.logger = logger
	webServer.logger = logger

	// ric930-fake-smtp install
	//
	// ric930-fake-smtp \
	//     -config config.yaml \
	//     install
	//
	args := flag.Args()

	if len(args) > 1 {
		log.Fatalf(
			"Unexpected arguments: %v",
			args,
		)
	}

	if len(args) == 1 {
		if err := service.Control(
			s,
			args[0],
		); err != nil {
			log.Fatal(err)
		}

		return
	}

	if err := s.Run(); err != nil {
		logger.Error(err)
	}
}