authPostman/internal/authPostman.go

package authPostman

import (
	"context"
	"encoding/json"
	"log"
	"net"
	"strconv"

	"git.slaventius.ru/test3k/authPostman/internal/config"
	kafka "git.slaventius.ru/test3k/authPostman/internal/transport/kafka"
	smtp "git.slaventius.ru/test3k/authPostman/internal/transport/smtp"
)

type msg struct {
	Code  string
	Email string
}

type AuthPostmanServer struct {
	ctx         context.Context
	kafkaReader *kafka.KafkaReader
	config      *config.Config
}

func NewServer(ctx context.Context, config *config.Config, topic string) *AuthPostmanServer {
	address := []string{net.JoinHostPort(config.Kafka.Host, strconv.Itoa(config.Kafka.Port))}

	return &AuthPostmanServer{
		ctx:         ctx,
		kafkaReader: kafka.NewReader(ctx, config, topic, address...),
		config:      config,
	}
}

func (s *AuthPostmanServer) GracefulStop() error {
	return s.kafkaReader.Close()
}

func (s *AuthPostmanServer) ReadMessage(offset int64) error {
	// ...
	// s.kafkaReader.SetOffset(offset)

	//
	for {
		m, err := s.kafkaReader.ReadMessage()
		if err != nil {
			return err
		}

		// Декодируем сообщение
		amsg := msg{}
		erk := json.Unmarshal(m.Value, &amsg)
		if erk != nil {
			return erk
		}

		//
		log.Printf("send code %s to %s ...", amsg.Code, amsg.Email)
		// log.Printf("message at offset %d: %s = %s\n", m.Offset, string(m.Key), string(m.Value))

		//
		message := smtp.NewMessage("Confirmation code", amsg.Code)
		message.AppendRecipient(amsg.Email)

		//
		smtpSender := smtp.NewService(s.config.Smtp.Host, s.config.Smtp.Port, s.config.Smtp.Sender, s.config.Smtp.Password)
		ers := smtpSender.Send(message)
		if ers != nil {
			log.Print(ers)
		}

		log.Printf("send code %s to %s completed", amsg.Code, amsg.Email)
	}
}