mirror of
https://github.com/SourceFellows/gobuch.git
synced 2024-10-22 22:05:35 +00:00
71 lines
1.1 KiB
Go
71 lines
1.1 KiB
Go
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package main
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import (
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"context"
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"log"
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"os"
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"sync"
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"time"
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"github.com/nats-io/nats.go"
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)
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type Message struct {
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Text string
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}
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func connectNATS(ctx context.Context, url string) (*nats.Conn, error) {
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var err error
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for {
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select {
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case <-ctx.Done():
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return nil, err
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default:
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var nc *nats.Conn
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nc, err = nats.Connect(url)
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if err == nil {
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return nc, err
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}
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}
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}
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}
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func main() {
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url := nats.DefaultURL
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if v, ok := os.LookupEnv("NATS_URL"); ok {
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url = v
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}
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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nc, err := connectNATS(ctx, url)
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if err != nil {
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log.Fatalf("Could not connect to server because of %v", err)
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}
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defer nc.Close()
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log.Println("successfully connected to NATS server")
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c, _ := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
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defer c.Close()
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wg := sync.WaitGroup{}
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wg.Add(1)
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sub, err := c.Subscribe("testing", func(message *Message) {
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log.Printf("neue Nachricht %+v", message)
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})
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if err != nil {
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log.Fatalf("Could not subscribe because of %v", err)
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}
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log.Printf("Warte auf Nachrichten")
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wg.Wait()
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sub.Unsubscribe()
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sub.Drain()
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}
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