feature: added nsq as broker for events (#6740)

vendor/github.com/nsqio/go-nsq/errors.go

@@ -0,0 +1,44 @@
+package nsq
+
+import (
+	"errors"
+	"fmt"
+)
+
+// ErrNotConnected is returned when a publish command is made
+// against a Producer that is not connected
+var ErrNotConnected = errors.New("not connected")
+
+// ErrStopped is returned when a publish command is
+// made against a Producer that has been stopped
+var ErrStopped = errors.New("stopped")
+
+// ErrClosing is returned when a connection is closing
+var ErrClosing = errors.New("closing")
+
+// ErrAlreadyConnected is returned from ConnectToNSQD when already connected
+var ErrAlreadyConnected = errors.New("already connected")
+
+// ErrOverMaxInFlight is returned from Consumer if over max-in-flight
+var ErrOverMaxInFlight = errors.New("over configure max-inflight")
+
+// ErrIdentify is returned from Conn as part of the IDENTIFY handshake
+type ErrIdentify struct {
+	Reason string
+}
+
+// Error returns a stringified error
+func (e ErrIdentify) Error() string {
+	return fmt.Sprintf("failed to IDENTIFY - %s", e.Reason)
+}
+
+// ErrProtocol is returned from Producer when encountering
+// an NSQ protocol level error
+type ErrProtocol struct {
+	Reason string
+}
+
+// Error returns a stringified error
+func (e ErrProtocol) Error() string {
+	return e.Reason
+}