Define Adapter base type/interface

src/yggdrasil/adapter.go

@@ -0,0 +1,25 @@
+package yggdrasil
+
+// Defines the minimum required functions for an adapter type.
+type AdapterInterface interface {
+	init(core *Core, send chan<- []byte, recv <-chan []byte)
+	read() error
+	write() error
+	close() error
+}
+
+// Defines the minimum required struct members for an adapter type (this is
+// now the base type for tunAdapter in tun.go)
+type Adapter struct {
+	AdapterInterface
+	core *Core
+	send chan<- []byte
+	recv <-chan []byte
+}
+
+// Initialises the adapter.
+func (adapter *Adapter) init(core *Core, send chan<- []byte, recv <-chan []byte) {
+	adapter.core = core
+	adapter.send = send
+	adapter.recv = recv
+}

src/yggdrasil/router.go

@@ -30,12 +30,6 @@ import (
 	"golang.org/x/net/ipv6"
 )
 
-type adapter struct {
-	core *Core
-	send chan<- []byte
-	recv <-chan []byte
-}
-
 // The router struct has channels to/from the tun/tap device and a self peer (0), which is how messages are passed between this node and the peers/switch layer.
 // The router's mainLoop goroutine is responsible for managing all information related to the dht, searches, and crypto sessions.
 type router struct {
@@ -46,7 +40,7 @@ type router struct {
 	out       func([]byte)           // packets we're sending to the network, link to peer's "in"
 	toRecv    chan router_recvPacket // packets to handle via recvPacket()
 	tun       tunAdapter             // TUN/TAP adapter
-	adapters  []adapter              // Other adapters
+	adapters  []Adapter              // Other adapters
 	recv      chan<- []byte          // place where the tun pulls received packets from
 	send      <-chan []byte          // place where the tun puts outgoing packets
 	reset     chan struct{}          // signal that coords changed (re-init sessions/dht)

src/yggdrasil/tun.go

@@ -18,7 +18,7 @@ const tun_ETHER_HEADER_LENGTH = 14
 
 // Represents a running TUN/TAP interface.
 type tunAdapter struct {
-	adapter
+	Adapter
 	icmpv6 icmpv6
 	mtu    int
 	iface  *water.Interface
@@ -35,10 +35,8 @@ func getSupportedMTU(mtu int) int {
 
 // Initialises the TUN/TAP adapter.
 func (tun *tunAdapter) init(core *Core, send chan<- []byte, recv <-chan []byte) {
-	tun.core = core
+	tun.Adapter.init(core, send, recv)
 	tun.icmpv6.init(tun)
-	tun.send = send
-	tun.recv = recv
 }
 
 // Starts the setup process for the TUN/TAP adapter, and if successful, starts