work-in-progress on a new sim

src/yggdrasil/simlink.go

@@ -0,0 +1,88 @@
+package yggdrasil
+
+import (
+	"errors"
+	"github.com/Arceliar/phony"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
+
+type Simlink struct {
+	phony.Inbox
+	rch     chan []byte
+	dest    *Simlink
+	link    *linkInterface
+	started bool
+}
+
+func (s *Simlink) readMsg() ([]byte, error) {
+	bs := <-s.rch
+	if bs != nil {
+		return bs, nil
+	} else {
+		return nil, errors.New("read from closed Simlink")
+	}
+}
+
+func (s *Simlink) _recvMetaBytes() ([]byte, error) {
+	return s.readMsg()
+}
+
+func (s *Simlink) _sendMetaBytes(bs []byte) error {
+	_, err := s.writeMsgs([][]byte{bs})
+	return err
+}
+
+func (s *Simlink) close() error {
+	close(s.rch)
+	return nil
+}
+
+func (s *Simlink) writeMsgs(msgs [][]byte) (int, error) {
+	if s.dest == nil {
+		return 0, errors.New("write to unpaired Simlink")
+	}
+	var size int
+	for _, msg := range msgs {
+		size += len(msg)
+		bs := append(util.GetBytes(), msg...)
+		phony.Block(s, func() {
+			s.dest.Act(s, func() {
+				defer func() { recover() }()
+				s.dest.rch <- bs
+			})
+		})
+	}
+	return size, nil
+}
+
+func (c *Core) NewSimlink() *Simlink {
+	s := &Simlink{rch: make(chan []byte, 1)}
+	n := "Simlink"
+	s.link, _ = c.link.create(s, n, n, n, n, false, true)
+	return s
+}
+
+func (s *Simlink) SetDestination(dest *Simlink) error {
+	var err error
+	phony.Block(s, func() {
+		if s.dest != nil {
+			err = errors.New("destination already set")
+		} else {
+			s.dest = dest
+		}
+	})
+	return err
+}
+
+func (s *Simlink) Start() error {
+	var err error
+	phony.Block(s, func() {
+		if s.started {
+			err = errors.New("already started")
+		} else {
+			s.started = true
+			go s.link.handler()
+		}
+	})
+	return err
+}