added 'isComplete' to check request completion

http/upgrade/request/private.go

@@ -74,3 +74,48 @@ func (r *T) parseHeader(b []byte) error {
 	return nil
 
 }
+
+
+
+// isComplete returns whether the Upgrade Request
+// is complete (no missing required item)
+func (r T) isComplete() error {
+
+	/* (1) Request-Line */
+	if !r.first {
+		return fmt.Errorf("Missing HTTP Request-Line");
+	}
+
+	/* (2) Host */
+	if len(r.host) == 0 {
+		return fmt.Errorf("Missing 'Host' header")
+	}
+
+	/* (3) Origin */
+	if len(r.origin) == 0 {
+		return fmt.Errorf("Missing 'Origin' header")
+	}
+
+	/* (4) Connection */
+	if !r.hasConnection {
+		return fmt.Errorf("Missing 'Connection' header");
+	}
+
+	/* (5) Upgrade */
+	if !r.hasUpgrade {
+		return fmt.Errorf("Missing 'Upgrade' header");
+	}
+
+	/* (6) Sec-WebSocket-Version */
+	if !r.hasVersion {
+		return fmt.Errorf("Missing 'Sec-WebSocket-Version' header");
+	}
+
+	/* (7) Sec-WebSocket-Key */
+	if len(r.key) < 1 {
+		return fmt.Errorf("Missing 'Sec-WebSocket-Key' header");
+	}
+
+	return nil
+
+}