natsio/server_reqres.go

package natsio

import (
	"errors"
	"fmt"
	"time"

	"github.com/nats-io/nats.go"
)

// Default timeout 10s
const requestTimeout = 10 * time.Second

// Request ...
func (s Server) Request(subject string, payload []byte) (*nats.Msg, error) {
	timeout := requestTimeout
	if s.cfg.RequestTimeout > 0 {
		timeout = s.cfg.RequestTimeout
	}
	msg, err := s.instance.Request(subject, payload, timeout)
	if errors.Is(err, nats.ErrNoResponders) {
		fmt.Printf("[natsio.Server] no responders for subject: %s \n", subject)
	} else if s.cfg.Debug {
		fmt.Printf("[natsio.Server] send request to subject #%s successfully \n", subject)
	}

	return msg, err
}

// RequestWithBindData ...
func (s Server) RequestWithBindData(subject string, payload []byte, result interface{}) error {
	msg, err := s.Request(subject, payload)
	if msg == nil || err != nil {
		return err
	}

	// map
	return BytesToInterface(msg.Data, result)
}

// Reply ...
func (s Server) Reply(msg *nats.Msg, payload []byte) error {
	return s.instance.Publish(msg.Reply, payload)
}

// Subscribe ...
func (s Server) Subscribe(subject string, cb nats.MsgHandler) (*nats.Subscription, error) {
	sub, err := s.instance.Subscribe(subject, cb)
	if err != nil {
		msg := fmt.Sprintf("[natsio.Server] subscribe subject %s error: %s", subject, err.Error())
		return nil, errors.New(msg)
	}

	if s.cfg.Debug {
		fmt.Printf("[natsio.Server] subscribe to subject #%s \n", subject)
	}

	return sub, nil
}

// QueueSubscribe ...
func (s Server) QueueSubscribe(subject, queue string, cb nats.MsgHandler) (*nats.Subscription, error) {
	sub, err := s.instance.QueueSubscribe(subject, queue, cb)
	if err != nil {
		msg := fmt.Sprintf("[natsio.Server] queue subscribe subject %s, queue %s error: %s", subject, queue, err.Error())
		return nil, errors.New(msg)
	}

	if s.cfg.Debug {
		fmt.Printf("[natsio.Server] queue subscribe to subject #%s \n", subject)
	}

	return sub, nil
}