Link refactor (#941)

* Link refactoring

* More refactoring

* More tweaking

* Cleaner shutdowns, UNIX socket support, more tweaks

* Actorise links, remove mutex

* SOCKS support

src/core/api.go

@@ -2,6 +2,7 @@ package core
 
 import (
 	"crypto/ed25519"
+	"fmt"
 	"sync/atomic"
 	"time"
 
@@ -15,6 +16,7 @@ import (
 	//"sort"
 	//"time"
 
+	"github.com/Arceliar/phony"
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 	//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
@@ -68,11 +70,11 @@ func (c *Core) GetSelf() SelfInfo {
 func (c *Core) GetPeers() []PeerInfo {
 	var peers []PeerInfo
 	names := make(map[net.Conn]string)
-	c.links.mutex.Lock()
-	for _, info := range c.links.links {
-		names[info.conn] = info.lname
-	}
-	c.links.mutex.Unlock()
+	phony.Block(&c.links, func() {
+		for _, info := range c.links._links {
+			names[info.conn] = info.lname
+		}
+	})
 	ps := c.PacketConn.PacketConn.Debug.GetPeers()
 	for _, p := range ps {
 		var info PeerInfo
@@ -136,8 +138,17 @@ func (c *Core) GetSessions() []SessionInfo {
 // Listen starts a new listener (either TCP or TLS). The input should be a url.URL
 // parsed from a string of the form e.g. "tcp://a.b.c.d:e". In the case of a
 // link-local address, the interface should be provided as the second argument.
-func (c *Core) Listen(u *url.URL, sintf string) (*TcpListener, error) {
-	return c.links.tcp.listenURL(u, sintf)
+func (c *Core) Listen(u *url.URL, sintf string) (*Listener, error) {
+	switch u.Scheme {
+	case "tcp":
+		return c.links.tcp.listen(u, sintf)
+	case "tls":
+		return c.links.tls.listen(u, sintf)
+	case "unix":
+		return c.links.unix.listen(u, sintf)
+	default:
+		return nil, fmt.Errorf("unrecognised scheme %q", u.Scheme)
+	}
 }
 
 // Address gets the IPv6 address of the Yggdrasil node. This is always a /128