From 9c818c6278473a923e400832b94daf93ab977c12 Mon Sep 17 00:00:00 2001
From: Arceliar <Arceliar@users.noreply.github.com>
Date: Sun, 26 Apr 2020 07:33:03 -0500
Subject: [PATCH] work-in-progress on a new sim

---
 build                     |  2 +-
 cmd/yggdrasilsim/main.go  | 15 +++++++
 cmd/yggdrasilsim/node.go  | 23 ++++++++++
 cmd/yggdrasilsim/store.go | 41 ++++++++++++++++++
 src/yggdrasil/simlink.go  | 88 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 168 insertions(+), 1 deletion(-)
 create mode 100644 cmd/yggdrasilsim/main.go
 create mode 100644 cmd/yggdrasilsim/node.go
 create mode 100644 cmd/yggdrasilsim/store.go
 create mode 100644 src/yggdrasil/simlink.go

diff --git a/build b/build
index 66f94403..6b93ca77 100755
--- a/build
+++ b/build
@@ -45,7 +45,7 @@ elif [ $ANDROID ]; then
     github.com/yggdrasil-network/yggdrasil-extras/src/mobile \
     github.com/yggdrasil-network/yggdrasil-extras/src/dummy
 else
-  for CMD in yggdrasil yggdrasilctl ; do
+  for CMD in yggdrasil yggdrasilctl yggdrasilsim; do
     echo "Building: $CMD"
     go build $ARGS -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" ./cmd/$CMD
 
diff --git a/cmd/yggdrasilsim/main.go b/cmd/yggdrasilsim/main.go
new file mode 100644
index 00000000..40fd9ce4
--- /dev/null
+++ b/cmd/yggdrasilsim/main.go
@@ -0,0 +1,15 @@
+package main
+
+import (
+//"github.com/yggdrasil-network/yggdrasil-go/src/address"
+//"github.com/yggdrasil-network/yggdrasil-go/src/config"
+//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
+)
+
+func main() {
+	store := makeStoreSquareGrid(4)
+	var block chan struct{}
+	<-block
+	panic(store)
+}
diff --git a/cmd/yggdrasilsim/node.go b/cmd/yggdrasilsim/node.go
new file mode 100644
index 00000000..e23b5109
--- /dev/null
+++ b/cmd/yggdrasilsim/node.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"io/ioutil"
+
+	"github.com/gologme/log"
+
+	//"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/config"
+	//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
+)
+
+type simNode struct {
+	core yggdrasil.Core
+	id   int
+}
+
+func newNode(id int) *simNode {
+	n := simNode{id: id}
+	n.core.Start(config.GenerateConfig(), log.New(ioutil.Discard, "", 0))
+	return &n
+}
diff --git a/cmd/yggdrasilsim/store.go b/cmd/yggdrasilsim/store.go
new file mode 100644
index 00000000..6fce81a4
--- /dev/null
+++ b/cmd/yggdrasilsim/store.go
@@ -0,0 +1,41 @@
+package main
+
+type nodeStore map[int]*simNode
+
+func makeStoreSingle() nodeStore {
+	s := make(nodeStore)
+	s[0] = newNode(0)
+	return s
+}
+
+func linkNodes(a *simNode, b *simNode) {
+	la := a.core.NewSimlink()
+	lb := b.core.NewSimlink()
+	la.SetDestination(lb)
+	lb.SetDestination(la)
+	la.Start()
+	lb.Start()
+}
+
+func makeStoreSquareGrid(sideLength int) nodeStore {
+	store := make(nodeStore)
+	nNodes := sideLength * sideLength
+	idxs := make([]int, 0, nNodes)
+	// TODO shuffle nodeIDs
+	for idx := 1; idx <= nNodes; idx++ {
+		idxs = append(idxs, idx)
+	}
+	for _, idx := range idxs {
+		n := newNode(idx)
+		store[idx] = n
+	}
+	for idx := 0; idx < nNodes; idx++ {
+		if (idx % sideLength) != 0 {
+			linkNodes(store[idxs[idx]], store[idxs[idx-1]])
+		}
+		if idx >= sideLength {
+			linkNodes(store[idxs[idx]], store[idxs[idx-sideLength]])
+		}
+	}
+	return store
+}
diff --git a/src/yggdrasil/simlink.go b/src/yggdrasil/simlink.go
new file mode 100644
index 00000000..33332645
--- /dev/null
+++ b/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
+}