libnmdc: isolate constants

src/libnmdc/libnmdc.go

@@ -12,6 +12,11 @@ import (
 	"time"
 )
 
+const (
+	DEFAULT_CLIENT_TAG string = "libnmdc.go"
+	DEFAULT_HUB_NAME   string = "(unknown)"
+)
+
 type ConnectionState int
 type HubEventType int
 
@@ -401,12 +406,12 @@ func (this *HubConnection) worker() {
 
 func (this *HubConnectionOptions) prepareConnection() *HubConnection {
 	if this.Self.ClientTag == "" {
-		this.Self.ClientTag = "libnmdc.go"
+		this.Self.ClientTag = DEFAULT_CLIENT_TAG
 	}
 
 	hc := HubConnection{
 		Hco:     this,
-		HubName: "(unknown)",
+		HubName: DEFAULT_HUB_NAME,
 		State:   CONNECTIONSTATE_DISCONNECTED,
 		Users:   make(map[string]UserInfo),
 	}