add pkgs from core

listener/rudp/metadata.go

@@ -0,0 +1,52 @@
+package rudp
+
+import (
+	"time"
+
+	mdata "github.com/go-gost/core/metadata"
+	mdx "github.com/go-gost/x/metadata"
+)
+
+const (
+	defaultTTL            = 5 * time.Second
+	defaultReadBufferSize = 1500
+	defaultReadQueueSize  = 128
+	defaultBacklog        = 128
+)
+
+type metadata struct {
+	ttl            time.Duration
+	readBufferSize int
+	readQueueSize  int
+	backlog        int
+}
+
+func (l *rudpListener) parseMetadata(md mdata.Metadata) (err error) {
+	const (
+		ttl            = "ttl"
+		readBufferSize = "readBufferSize"
+		readQueueSize  = "readQueueSize"
+		backlog        = "backlog"
+	)
+
+	l.md.ttl = mdx.GetDuration(md, ttl)
+	if l.md.ttl <= 0 {
+		l.md.ttl = defaultTTL
+	}
+	l.md.readBufferSize = mdx.GetInt(md, readBufferSize)
+	if l.md.readBufferSize <= 0 {
+		l.md.readBufferSize = defaultReadBufferSize
+	}
+
+	l.md.readQueueSize = mdx.GetInt(md, readQueueSize)
+	if l.md.readQueueSize <= 0 {
+		l.md.readQueueSize = defaultReadQueueSize
+	}
+
+	l.md.backlog = mdx.GetInt(md, backlog)
+	if l.md.backlog <= 0 {
+		l.md.backlog = defaultBacklog
+	}
+
+	return
+}