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nats.go
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nats.go
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package peanats
import (
"context"
"github.com/nats-io/nats.go"
)
type PublisherMsg interface {
PublishMsg(msg *nats.Msg) error
}
type RequesterMsg interface {
RequestMsg(ctx context.Context, msg *nats.Msg) (*nats.Msg, error)
}
type Subscriber interface {
Subscribe(subj string) (Subscription, error)
QueueSubscribe(subj, queue string) (Subscription, error)
}
type ChanSubscriber interface {
ChanSubscribe(subj string, ch chan *nats.Msg) (Unsubscriber, error)
ChanQueueSubscribe(subj, queue string, ch chan *nats.Msg) (Unsubscriber, error)
}
type Connection interface {
PublisherMsg
RequesterMsg
Subscriber
ChanSubscriber
Drain() error
}
type Unsubscriber interface {
Unsubscribe() error
}
type Subscription interface {
Unsubscriber
NextMsg(ctx context.Context) (*nats.Msg, error)
}
func NATS(nc *nats.Conn) Connection {
return &connectionImpl{nc}
}
type connectionImpl struct {
nc *nats.Conn
}
func (c *connectionImpl) PublishMsg(msg *nats.Msg) error {
return c.nc.PublishMsg(msg)
}
func (c *connectionImpl) RequestMsg(ctx context.Context, msg *nats.Msg) (*nats.Msg, error) {
return c.nc.RequestMsgWithContext(ctx, msg)
}
func (c *connectionImpl) Drain() error {
return c.nc.Drain()
}
func (c *connectionImpl) Subscribe(subj string) (Subscription, error) {
sub, err := c.nc.SubscribeSync(subj)
if err != nil {
return nil, err
}
return &subscriptionImpl{sub}, nil
}
func (c *connectionImpl) QueueSubscribe(subj, queue string) (Subscription, error) {
sub, err := c.nc.QueueSubscribeSync(subj, queue)
if err != nil {
return nil, err
}
return &subscriptionImpl{sub}, nil
}
func (c *connectionImpl) ChanSubscribe(subj string, ch chan *nats.Msg) (Unsubscriber, error) {
sub, err := c.nc.ChanSubscribe(subj, ch)
if err != nil {
return nil, err
}
return &subscriptionImpl{sub}, nil
}
func (c *connectionImpl) ChanQueueSubscribe(subj, queue string, ch chan *nats.Msg) (Unsubscriber, error) {
sub, err := c.nc.ChanQueueSubscribe(subj, queue, ch)
if err != nil {
return nil, err
}
return &subscriptionImpl{sub}, nil
}
type subscriptionImpl struct {
sub *nats.Subscription
}
func (s *subscriptionImpl) NextMsg(ctx context.Context) (*nats.Msg, error) {
return s.sub.NextMsgWithContext(ctx)
}
func (s *subscriptionImpl) Unsubscribe() error {
return s.sub.Unsubscribe()
}