/
natscliws.go
87 lines (70 loc) · 1.59 KB
/
natscliws.go
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package natscliws
import (
"net"
"net/url"
"time"
"github.com/gorilla/websocket"
nats "github.com/nats-io/nats.go"
)
// New connects to nats via websocket dialer
func New(ws string, n string) (*MQ, error) {
opts := []nats.Option{
nats.SetCustomDialer(&customDialer{ws}),
nats.ReconnectWait(1 * time.Second),
nats.DontRandomize(),
nats.MaxReconnects(1<<31 - 1),
}
nc, err := nats.Connect(n, opts...)
return &MQ{nc}, err
}
type customDialer struct {
url string
}
func (cd *customDialer) Dial(network, address string) (net.Conn, error) {
u, _ := url.Parse(cd.url)
c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
if err != nil {
return nil, err
}
return c.UnderlyingConn(), nil
}
type MQ struct {
conn *nats.Conn
}
func (mq *MQ) UnderlyingConn() *nats.Conn {
return mq.conn
}
func (mq *MQ) Subscribe(t string, cb MsgHandler) (*Subscription, error) {
sub, err := mq.conn.Subscribe(t, func(msg *nats.Msg) {
cb(&Msg{*msg})
})
if err != nil {
return nil, err
}
return &Subscription{*sub}, nil
}
func (mq *MQ) QueueSubscribe(t, q string, cb MsgHandler) (*Subscription, error) {
sub, err := mq.conn.QueueSubscribe(t, q, func(msg *nats.Msg) {
cb(&Msg{*msg})
})
if err != nil {
return nil, err
}
return &Subscription{*sub}, nil
}
func (mq *MQ) Publish(t string, pl []byte) error {
return mq.conn.Publish(t, pl)
}
func (mq *MQ) Flush() error {
return mq.conn.Flush()
}
func (mq *MQ) FlushTimeout(d time.Duration) error {
return mq.conn.FlushTimeout(d)
}
type MsgHandler func(msg *Msg)
type Msg struct {
nats.Msg
}
type Subscription struct {
nats.Subscription
}