complete rewrite to grpc

discarded-host.go

@@ -9,7 +9,6 @@ import (
 )
 
 type DiscardedHost struct {
-	*Connection
 	Host  string
 	Tries int
 }
@@ -26,7 +25,7 @@ func (d *DiscardedHostHandler) run() {
 		d.mu.RLock()
 		lst := make([]*DiscardedHost, 0, len(d.hosts))
 		for _, host := range d.hosts {
-			if host.Tries >= 0 || host.Tries < 5 {
+			if host.Tries >= 0 && host.Tries < 5 {
 				go d.testConnection(host)
 				lst = append(lst, host)
 			} else {
@@ -49,7 +48,9 @@ func (d *DiscardedHostHandler) testConnection(host *DiscardedHost) {
 
 	if err != nil {
 		host.Tries++
-		host.Tries = -1
+		if host.Tries >= 5 {
+			// Exceeded retry threshold; will be dropped by run loop.
+		}
 	} else {
 		conn.Close()
 		if d.onConnection != nil {