add sni connector

pkg/connector/sni/metadata.go

@@ -0,0 +1,24 @@
+package sni
+
+import (
+	"time"
+
+	md "github.com/go-gost/gost/pkg/metadata"
+)
+
+type metadata struct {
+	host           string
+	connectTimeout time.Duration
+}
+
+func (c *sniConnector) parseMetadata(md md.Metadata) (err error) {
+	const (
+		host           = "host"
+		connectTimeout = "timeout"
+	)
+
+	c.md.host = md.GetString(host)
+	c.md.connectTimeout = md.GetDuration(connectTimeout)
+
+	return
+}