add buffer size option for udp connection

listener/udp/metadata.go

@@ -9,47 +9,39 @@ import (
 
 const (
 	defaultTTL            = 5 * time.Second
-	defaultReadBufferSize = 8192
+	defaultReadBufferSize = 4096
 	defaultReadQueueSize  = 128
 	defaultBacklog        = 128
 )
 
 type metadata struct {
-	readBufferSize         int
-	readQueueSize          int
-	backlog                int
-	keepalive              bool
-	ttl                    time.Duration
+	readBufferSize int
+	readQueueSize  int
+	backlog        int
+	keepalive      bool
+	ttl            time.Duration
 }
 
 func (l *udpListener) parseMetadata(md mdata.Metadata) (err error) {
-	const (
-		readBufferSize = "readBufferSize"
-		readQueueSize  = "readQueueSize"
-		backlog        = "backlog"
-		keepalive      = "keepalive"
-		ttl            = "ttl"
-	)
+	l.md.backlog = mdutil.GetInt(md, "backlog")
+	if l.md.backlog <= 0 {
+		l.md.backlog = defaultBacklog
+	}
 
-	l.md.ttl = mdutil.GetDuration(md, ttl)
+	l.md.keepalive = mdutil.GetBool(md, "keepalive")
+	l.md.ttl = mdutil.GetDuration(md, "ttl", "keepalive.ttl")
 	if l.md.ttl <= 0 {
 		l.md.ttl = defaultTTL
 	}
-	l.md.readBufferSize = mdutil.GetInt(md, readBufferSize)
+	l.md.readBufferSize = mdutil.GetInt(md, "readBufferSize", "udp.bufferSize")
 	if l.md.readBufferSize <= 0 {
 		l.md.readBufferSize = defaultReadBufferSize
 	}
 
-	l.md.readQueueSize = mdutil.GetInt(md, readQueueSize)
+	l.md.readQueueSize = mdutil.GetInt(md, "readQueueSize", "recvQueueSize")
 	if l.md.readQueueSize <= 0 {
 		l.md.readQueueSize = defaultReadQueueSize
 	}
 
-	l.md.backlog = mdutil.GetInt(md, backlog)
-	if l.md.backlog <= 0 {
-		l.md.backlog = defaultBacklog
-	}
-	l.md.keepalive = mdutil.GetBool(md, keepalive)
-
 	return
 }