Refactor: remove nat pkg

component/nat/nat.go

@@ -1,31 +0,0 @@
-/*
-Package nat provides simple NAT table implements.
-
-* Normal (Full Cone) NAT
-A full cone NAT is one where all requests from the same internal IP address
-and port are mapped to the same external IP address and port. Furthermore,
-any external host can send a packet to the internal host, by sending a packet
-to the mapped external address.
-
-* Restricted Cone NAT
-A restricted cone NAT is one where all requests from the same internal IP
-address and port are mapped to the same external IP address and port.
-Unlike a full cone NAT, an external host (with IP address X) can send a
-packet to the internal host only if the internal host had previously sent
-a packet to IP address X.
-
-* Port Restricted Cone NAT
-A port restricted cone NAT is like a restricted cone NAT, but the restriction
-includes port numbers. Specifically, an external host can send a packet, with
-source IP address X and source port P, to the internal host only if the internal
-host had previously sent a packet to IP address X and port P.
-
-* Symmetric NAT
-A symmetric NAT is one where all requests from the same internal IP address
-and port, to a specific destination IP address and port, are mapped to the
-same external IP address and port. If the same host sends a packet with the
-same source address and port, but to a different destination, a different mapping
-is used. Furthermore, only the external host that receives a packet can send a
-UDP packet back to the internal host.
-*/
-package nat

component/nat/table.go

@@ -1,35 +0,0 @@
-package nat
-
-import (
-	"net"
-	"sync"
-)
-
-type Table struct {
-	mapping sync.Map
-}
-
-func (t *Table) Set(key string, pc net.PacketConn) {
-	t.mapping.Store(key, pc)
-}
-
-func (t *Table) Get(key string) net.PacketConn {
-	item, exist := t.mapping.Load(key)
-	if !exist {
-		return nil
-	}
-	return item.(net.PacketConn)
-}
-
-func (t *Table) GetOrCreateLock(key string) (*sync.Cond, bool) {
-	item, loaded := t.mapping.LoadOrStore(key, sync.NewCond(&sync.Mutex{}))
-	return item.(*sync.Cond), loaded
-}
-
-func (t *Table) Delete(key string) {
-	t.mapping.Delete(key)
-}
-
-func NewTable() *Table {
-	return &Table{}
-}