parse and handle config; put Apache 2.0 License

abstract/abstract.go

@@ -0,0 +1,45 @@
+package abstract
+
+/*
+   Copyright 2025 Suyono <suyono3484@gmail.com>
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+import "time"
+
+type ConnectionType int
+
+const (
+	TCP ConnectionType = iota
+	UDP
+)
+
+type ConnectionConfig interface {
+	Name() string
+	Type() ConnectionType
+	AsTCP() TCPConnectionConfig
+	AsUDP() UDPConnectionConfig
+	Listen() string
+	Backend() string
+}
+
+type TCPConnectionConfig interface {
+	ConnectionConfig
+	KeepAlive() bool
+}
+
+type UDPConnectionConfig interface {
+	ConnectionConfig
+	Timeout() time.Duration
+}