func main() {
var ns *nats.Conn
var err error
const maxWait = 30
i := 0
for ; i < maxWait; i++ {
ns, err = nats.Connect(os.Getenv("NATS_URI"))
if err == nil {
break
}
time.Sleep(1 * time.Second)
}
if err != nil {
log.Fatalln("nats.Connect:", err)
}
defer ns.Close()
subReader, err := ns.SubscribeSync("nats-cast")
if err != nil {
log.Fatalln("nats.SubscribeSync:", err)
}
fmt.Println("waiting for messages from cast-server...")
for {
msg, err := subReader.NextMsg(5 * time.Minute)
if err == nats.ErrConnectionClosed {
return
} else if err != nil {
log.Fatal(err)
}
fmt.Println(string(msg.Data))
}
}
func TestNilConnection(t *testing.T) {
var nc *nats.Conn
data := []byte("ok")
// Publish
if err := nc.Publish("foo", data); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if err := nc.PublishMsg(nil); err == nil || err != nats.ErrInvalidMsg {
t.Fatalf("Expected ErrInvalidMsg error, got %v\n", err)
}
if err := nc.PublishMsg(&nats.Msg{}); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if err := nc.PublishRequest("foo", "reply", data); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
// Subscribe
if _, err := nc.Subscribe("foo", nil); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if _, err := nc.SubscribeSync("foo"); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if _, err := nc.QueueSubscribe("foo", "bar", nil); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
ch := make(chan *nats.Msg)
if _, err := nc.ChanSubscribe("foo", ch); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if _, err := nc.ChanQueueSubscribe("foo", "bar", ch); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if _, err := nc.QueueSubscribeSyncWithChan("foo", "bar", ch); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
// Flush
if err := nc.Flush(); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
if err := nc.FlushTimeout(time.Millisecond); err == nil || err != nats.ErrInvalidConnection {
t.Fatalf("Expected ErrInvalidConnection error, got %v\n", err)
}
// Nil Subscribers
var sub *nats.Subscription
if sub.Type() != nats.NilSubscription {
t.Fatalf("Got wrong type for nil subscription, %v\n", sub.Type())
}
if sub.IsValid() {
t.Fatalf("Expected IsValid() to return false")
}
if err := sub.Unsubscribe(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected Unsubscribe to return proper error, got %v\n", err)
}
if err := sub.AutoUnsubscribe(1); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, err := sub.NextMsg(time.Millisecond); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, err := sub.QueuedMsgs(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, _, err := sub.Pending(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, _, err := sub.MaxPending(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if err := sub.ClearMaxPending(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, _, err := sub.PendingLimits(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if err := sub.SetPendingLimits(1, 1); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, err := sub.Delivered(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
if _, err := sub.Dropped(); err == nil || err != nats.ErrBadSubscription {
t.Fatalf("Expected ErrBadSubscription error, got %v\n", err)
}
}