update

cmd/graphiql/main.go

@@ -17,7 +17,9 @@ func main() {
   db, err := badger.Open(badger.DefaultOptions("").WithInMemory(true))
   check(err)
 
-  ctx, err := gv.NewContext(db, gv.NewConsoleLogger([]string{"test", "signal"}))
+  ctx, err := gv.NewContext(&gv.BadgerDB{
+    DB: db,
+  }, gv.NewConsoleLogger([]string{"test"}))
   check(err)
 
   gql_ext, err := gv.NewGQLExt(ctx, ":8080", nil, nil)
@@ -25,13 +27,16 @@ func main() {
 
   listener_ext := gv.NewListenerExt(1000)
 
-  n1, err := gv.NewNode(ctx, nil, "Lockable", 1000, gv.NewLockableExt(nil))
+  n1, err := gv.NewNode(ctx, nil, "LockableNode", 1000, gv.NewLockableExt(nil))
   check(err)
 
-  n2, err := gv.NewNode(ctx, nil, "Lockable", 1000, gv.NewLockableExt([]gv.NodeID{n1.ID}))
+  n2, err := gv.NewNode(ctx, nil, "LockableNode", 1000, gv.NewLockableExt([]gv.NodeID{n1.ID}))
   check(err)
 
-  _, err = gv.NewNode(ctx, nil, "Lockable", 1000, gql_ext, listener_ext, gv.NewLockableExt([]gv.NodeID{n2.ID}))
+  n3, err := gv.NewNode(ctx, nil, "LockableNode", 1000, gv.NewLockableExt(nil))
+  check(err)
+
+  _, err = gv.NewNode(ctx, nil, "LockableNode", 1000, gql_ext, listener_ext, gv.NewLockableExt([]gv.NodeID{n2.ID, n3.ID}))
   check(err)
 
   for true {

db.go

@@ -3,153 +3,226 @@ package graphvent
 import (
 	"encoding/binary"
 	"fmt"
+	"reflect"
+  "sync"
 
 	badger "github.com/dgraph-io/badger/v3"
 )
 
-func WriteNodeInit(ctx *Context, node *Node) error {
+type Database interface {
+  WriteNodeInit(*Context, *Node) error
+  WriteNodeChanges(*Context, *Node, map[ExtType]Changes) error
+  LoadNode(*Context, NodeID) (*Node, error)
+}
+
+const WRITE_BUFFER_SIZE = 1000000
+type BadgerDB struct {
+  *badger.DB
+  sync.Mutex
+  buffer [WRITE_BUFFER_SIZE]byte
+}
+
+func (db *BadgerDB) WriteNodeInit(ctx *Context, node *Node) error {
   if node == nil {
     return fmt.Errorf("Cannot serialize nil *Node")
   }
 
-  return ctx.DB.Update(func(tx *badger.Txn) error {
+  return db.Update(func(tx *badger.Txn) error {
+    db.Lock()
+    defer db.Unlock()
+
     // Get the base key bytes
     id_ser, err := node.ID.MarshalBinary()
     if err != nil {
       return err
     }
 
+    cur := 0
+
     // Write Node value
-    node_val, err := Serialize(ctx, node)
+    written, err := Serialize(ctx, node, db.buffer[cur:])
     if err != nil {
       return err
     }
-    err = tx.Set(id_ser, node_val)
+
+    err = tx.Set(id_ser, db.buffer[cur:cur+written])
     if err != nil {
       return err
     }
 
+    cur += written
+    
     // Write empty signal queue
     sigqueue_id := append(id_ser, []byte(" - SIGQUEUE")...)
-    sigqueue_val, err := Serialize(ctx, node.SignalQueue)
+    written, err = Serialize(ctx, node.SignalQueue, db.buffer[cur:])
     if err != nil {
       return err
     }
-    err = tx.Set(sigqueue_id, sigqueue_val)
+
+    err = tx.Set(sigqueue_id, db.buffer[cur:cur+written])
     if err != nil {
       return err
     }
 
+    cur += written
+
     // Write node extension list
     ext_list := []ExtType{}
     for ext_type := range(node.Extensions) {
       ext_list = append(ext_list, ext_type)
     }
-    ext_list_val, err := Serialize(ctx, ext_list)
+    written, err = Serialize(ctx, ext_list, db.buffer[cur:])
     if err != nil {
       return err
     }
     ext_list_id := append(id_ser, []byte(" - EXTLIST")...)
-    err = tx.Set(ext_list_id, ext_list_val)
+    err = tx.Set(ext_list_id, db.buffer[cur:cur+written])
     if err != nil {
       return err
     }
+    cur += written
 
     // For each extension:
     for ext_type, ext := range(node.Extensions) {
-      // Write each extension's current value
+      ext_info, exists := ctx.Extensions[ext_type]
+      if exists == false {
+        return fmt.Errorf("Cannot serialize node with unknown extension %s", reflect.TypeOf(ext))
+      }
+
+      ext_value := reflect.ValueOf(ext).Elem()
       ext_id := binary.BigEndian.AppendUint64(id_ser, uint64(ext_type))
-      ext_val, err := Serialize(ctx, ext)
+
+      // Write each field to a seperate key
+      for field_tag, field_info := range(ext_info.Fields) {
+        field_value := ext_value.FieldByIndex(field_info.Index)
+
+        field_id := make([]byte, len(ext_id) + 8)
+        tmp := binary.BigEndian.AppendUint64(ext_id, uint64(GetFieldTag(string(field_tag))))
+        copy(field_id, tmp)
+
+        written, err := SerializeValue(ctx, field_value, db.buffer[cur:])
         if err != nil {
-        return err
+          return fmt.Errorf("Extension serialize err: %s, %w", reflect.TypeOf(ext), err)
+        }
+
+        err = tx.Set(field_id, db.buffer[cur:cur+written])
+        if err != nil {
+          return fmt.Errorf("Extension set err: %s, %w", reflect.TypeOf(ext), err)
+        }
+        cur += written
       }
-      err = tx.Set(ext_id, ext_val)
     }
     return nil
   })
 }
 
-func WriteNodeChanges(ctx *Context, node *Node, changes map[ExtType]Changes) error {
-  return ctx.DB.Update(func(tx *badger.Txn) error {
+func (db *BadgerDB) WriteNodeChanges(ctx *Context, node *Node, changes map[ExtType]Changes) error {
+  return db.Update(func(tx *badger.Txn) error {
+    db.Lock()
+    defer db.Unlock()
+
     // Get the base key bytes
-    id_ser, err := node.ID.MarshalBinary()
-    if err != nil {
-      return err
-    }
+    id_bytes := ([16]byte)(node.ID)
+
+    cur := 0
 
     // Write the signal queue if it needs to be written
     if node.writeSignalQueue {
       node.writeSignalQueue = false
 
-      sigqueue_id := append(id_ser, []byte(" - SIGQUEUE")...)
-      sigqueue_val, err := Serialize(ctx, node.SignalQueue)
+      sigqueue_id := append(id_bytes[:], []byte(" - SIGQUEUE")...)
+      written, err := Serialize(ctx, node.SignalQueue, db.buffer[cur:])
       if err != nil {
-        return err
+        return fmt.Errorf("SignalQueue Serialize Error: %+v, %w", node.SignalQueue, err)
       }
-      err = tx.Set(sigqueue_id, sigqueue_val)
+      err = tx.Set(sigqueue_id, db.buffer[cur:cur+written])
       if err != nil {
-        return err
+        return fmt.Errorf("SignalQueue set error: %+v, %w", node.SignalQueue, err)
       }
+      cur += written
     }
 
     // For each ext in changes
-    for ext_type := range(changes) {
-      // Write each ext
+    for ext_type, changes := range(changes) {
+      ext_info, exists := ctx.Extensions[ext_type]
+      if exists == false {
+        return fmt.Errorf("%s is not an extension in ctx", ext_type)
+      }
+
       ext, exists := node.Extensions[ext_type]
       if exists == false {
         return fmt.Errorf("%s is not an extension in %s", ext_type, node.ID)
       }
-      ext_id := binary.BigEndian.AppendUint64(id_ser, uint64(ext_type))
-      ext_ser, err := Serialize(ctx, ext)
+      ext_id := binary.BigEndian.AppendUint64(id_bytes[:], uint64(ext_type))
+      ext_value := reflect.ValueOf(ext)
+
+      // Write each field
+      for _, tag := range(changes) {
+        field_info, exists := ext_info.Fields[tag]
+        if exists == false {
+          return fmt.Errorf("Cannot serialize field %s of extension %s, does not exist", tag, ext_type)
+        }
+
+        field_value := ext_value.FieldByIndex(field_info.Index)
+
+        field_id := make([]byte, len(ext_id) + 8)
+        tmp := binary.BigEndian.AppendUint64(ext_id, uint64(GetFieldTag(string(tag))))
+        copy(field_id, tmp)
+
+        written, err := SerializeValue(ctx, field_value, db.buffer[cur:])
         if err != nil {
-        return err
+          return fmt.Errorf("Extension serialize err: %s, %w", reflect.TypeOf(ext), err)
         }
 
-      err = tx.Set(ext_id, ext_ser)
+        err = tx.Set(field_id, db.buffer[cur:cur+written])
         if err != nil {
-        return err
+          return fmt.Errorf("Extension set err: %s, %w", reflect.TypeOf(ext), err)
+        }
+        cur += written
       }
     }
     return nil
   })
 }
 
-func LoadNode(ctx *Context, id NodeID) (*Node, error) {
+func (db *BadgerDB) LoadNode(ctx *Context, id NodeID) (*Node, error) {
   var node *Node = nil
-  err := ctx.DB.View(func(tx *badger.Txn) error {
+
+  err := db.View(func(tx *badger.Txn) error {
     // Get the base key bytes
     id_ser, err := id.MarshalBinary()
     if err != nil {
-      return err
+      return fmt.Errorf("Failed to serialize node_id: %w", err)
     }
 
     // Get the node value
     node_item, err := tx.Get(id_ser)
     if err != nil {
-      return err
+      return fmt.Errorf("Failed to get node_item: %w", NodeNotFoundError)
     }
 
     err = node_item.Value(func(val []byte) error {
+      ctx.Log.Logf("db", "DESERIALIZE_NODE(%d bytes): %+v", len(val), val)
       node, err = Deserialize[*Node](ctx, val)
       return err
     })
 
     if err != nil {
-      return nil
+      return fmt.Errorf("Failed to deserialize Node %s - %w", id, err)
     }
 
     // Get the signal queue
     sigqueue_id := append(id_ser, []byte(" - SIGQUEUE")...)
     sigqueue_item, err := tx.Get(sigqueue_id)
     if err != nil {
-      return err
+      return fmt.Errorf("Failed to get sigqueue_id: %w", err)
     }
     err = sigqueue_item.Value(func(val []byte) error {
       node.SignalQueue, err = Deserialize[[]QueuedSignal](ctx, val)
       return err
     })
     if err != nil {
-      return err
+      return fmt.Errorf("Failed to deserialize []QueuedSignal for %s: %w", id, err)
     }
 
     // Get the extension list
@@ -168,20 +241,34 @@ func LoadNode(ctx *Context, id NodeID) (*Node, error) {
     // Get the extensions
     for _, ext_type := range(ext_list) {
       ext_id := binary.BigEndian.AppendUint64(id_ser, uint64(ext_type))
-      ext_item, err := tx.Get(ext_id)
+      ext_info, exists := ctx.Extensions[ext_type]
+      if exists == false {
+        return fmt.Errorf("Extension %s not in context", ext_type)
+      }
+
+      ext := reflect.New(ext_info.Type)
+      for field_tag, field_info := range(ext_info.Fields) {
+        field_id := binary.BigEndian.AppendUint64(ext_id, uint64(GetFieldTag(string(field_tag))))        
+        field_item, err := tx.Get(field_id)
+        if err != nil {
+          return fmt.Errorf("Failed to find key for %s:%s(%x) - %w", ext_type, field_tag, field_id, err)
+        }
+        err = field_item.Value(func(val []byte) error {
+          value, _, err := DeserializeValue(ctx, val, field_info.Type)
           if err != nil {
             return err
           }
 
-      var ext Extension
-      err = ext_item.Value(func(val []byte) error {
-        ext, err = Deserialize[Extension](ctx, val)
-        return err
+          ext.Elem().FieldByIndex(field_info.Index).Set(value)
+
+          return nil
         })
         if err != nil {
           return err
         }
-      node.Extensions[ext_type] = ext
+      }
+
+      node.Extensions[ext_type] = ext.Interface().(Extension)
     }
 
     return nil
@@ -189,6 +276,8 @@ func LoadNode(ctx *Context, id NodeID) (*Node, error) {
 
   if err != nil {
     return nil, err
+  } else if node == nil {
+    return nil, fmt.Errorf("Tried to return nil *Node from BadgerDB.LoadNode without error")
   }
 
   return node, nil

event.go

@@ -1,156 +0,0 @@
-package graphvent
-
-import (
-  "time"
-  "fmt"
-)
-
-type EventCommand string
-type EventState string
-
-type EventExt struct {
-  Name string `gv:"name"`
-  State EventState `gv:"state"`
-  StateStart time.Time `gv:"state_start"`
-  Parent NodeID `gv:"parent" node:"Base"`
-}
-
-func (ext *EventExt) Load(ctx *Context, node *Node) error {
-  return nil
-}
-
-func (ext *EventExt) Unload(ctx *Context, node *Node) {
-}
-
-func NewEventExt(parent NodeID, name string) *EventExt {
-  return &EventExt{
-    Name: name,
-    State: "init",
-    Parent: parent,
-  }
-}
-
-type EventStateSignal struct {
-  SignalHeader
-  Source NodeID `gv:"source"`
-  State EventState `gv:"state"`
-  Time time.Time `gv:"time"`
-}
-
-func (signal EventStateSignal) String() string {
-  return fmt.Sprintf("EventStateSignal(%s, %s, %s, %+v)", signal.SignalHeader, signal.Source, signal.State, signal.Time)
-}
-
-func NewEventStateSignal(source NodeID, state EventState, t time.Time) *EventStateSignal {
-  return &EventStateSignal{
-    SignalHeader: NewSignalHeader(),
-    Source: source,
-    State: state,
-    Time: t,
-  }
-}
-
-type EventControlSignal struct {
-  SignalHeader
-  Command EventCommand `gv:"command"`
-}
-
-func (signal EventControlSignal) String() string {
-  return fmt.Sprintf("EventControlSignal(%s, %s)", signal.SignalHeader, signal.Command)
-}
-
-func NewEventControlSignal(command EventCommand) *EventControlSignal {
-  return &EventControlSignal{
-    NewSignalHeader(),
-    command,
-  }
-}
-
-func (ext *EventExt) UpdateState(node *Node, changes Changes, state EventState, state_start time.Time) {
-  if ext.State != state {
-    ext.StateStart = state_start
-    changes.Add("state")
-    ext.State = state
-    node.QueueSignal(time.Now(), NewEventStateSignal(node.ID, ext.State, time.Now()))
-  }
-}
-
-func (ext *EventExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
-
-  return messages, changes
-}
-
-type TestEventExt struct {
-  Length time.Duration
-}
-
-func (ext *TestEventExt) Load(ctx *Context, node *Node) error {
-  return nil
-}
-
-func (ext *TestEventExt) Unload(ctx *Context, node *Node) {
-}
-
-type EventCommandMap map[EventCommand]map[EventState]EventState
-var test_event_commands = EventCommandMap{
-  "ready?": {
-    "init": "ready",
-  },
-  "start": {
-    "ready": "running",
-  },
-  "abort": {
-    "ready": "init",
-  },
-  "stop": {
-    "running": "stopped",
-  },
-  "finish": {
-    "running": "done",
-  },
-}
-
-
-func (ext *TestEventExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
-
-  switch sig := signal.(type) {
-  case *EventControlSignal:
-    event_ext, err := GetExt[EventExt](node)
-    if err != nil {
-      messages = append(messages, SendMsg{source, NewErrorSignal(sig.Id, "not_event")})
-    } else {
-      ctx.Log.Logf("event", "%s got %s EventControlSignal while in %s", node.ID, sig.Command, event_ext.State)
-      new_state, error_signal := event_ext.ValidateEventCommand(sig, test_event_commands)
-      if error_signal != nil {
-        messages = append(messages, SendMsg{source, error_signal})
-      } else {
-        switch sig.Command {
-        case "start":
-          node.QueueSignal(time.Now().Add(ext.Length), NewEventControlSignal("finish"))
-        }
-        event_ext.UpdateState(node, changes, new_state, time.Now())
-        messages = append(messages, SendMsg{source, NewSuccessSignal(sig.Id)})
-      }
-    }
-  }
-
-  return messages, changes
-}
-
-func(ext *EventExt) ValidateEventCommand(signal *EventControlSignal, commands EventCommandMap) (EventState, *ErrorSignal) {
-  transitions, command_mapped := commands[signal.Command]
-  if command_mapped == false {
-    return "", NewErrorSignal(signal.Id, "unknown command %s", signal.Command)
-  } else {
-    new_state, valid_transition := transitions[ext.State]
-    if valid_transition == false {
-      return "", NewErrorSignal(signal.Id, "invalid command state %s(%s)", signal.Command, ext.State)
-    } else {
-      return new_state, nil
-    }
-  }
-}

event_test.go

@@ -1,86 +0,0 @@
-package graphvent
-
-import (
-  "crypto/ed25519"
-  "testing"
-  "time"
-  "crypto/rand"
-)
-
-func TestEvent(t *testing.T) {
-  ctx := logTestContext(t, []string{"event", "listener", "listener_debug"})
-  err := RegisterExtension[TestEventExt](ctx, nil)
-  fatalErr(t, err)
-  err = RegisterObject[TestEventExt](ctx)
-  fatalErr(t, err)
-
-
-  event_public, event_private, err := ed25519.GenerateKey(rand.Reader)
-  event_listener := NewListenerExt(100)
-  event, err := NewNode(ctx, event_private, "Base", 100, NewEventExt(KeyID(event_public), "Test Event"), &TestEventExt{time.Second}, event_listener)
-  fatalErr(t, err)
-
-  response, signals := testSend(t, ctx, NewEventControlSignal("ready?"), event, event)
-  switch resp := response.(type) {
-  case *SuccessSignal:
-  case *ErrorSignal:
-    t.Fatalf("Error response %+v", resp.Error)
-  default:
-    t.Fatalf("Unexpected response %+v", resp)
-  }
-
-  var state_signal *EventStateSignal = nil
-  for _, signal := range(signals) {
-    event_state, is_event_state := signal.(*EventStateSignal)
-    if is_event_state == true && event_state.Source == event.ID && event_state.State == "ready" {
-      state_signal = event_state
-      break
-    }
-  }
-
-  if state_signal == nil {
-    state_signal, err = WaitForSignal(event_listener.Chan, 10*time.Millisecond, func(sig *EventStateSignal) bool {
-      return sig.Source == event.ID && sig.State == "ready"
-    })
-    fatalErr(t, err)
-  }
-
-  response, signals = testSend(t, ctx, NewEventControlSignal("start"), event, event)
-  switch resp := response.(type) {
-  case *SuccessSignal:
-  case *ErrorSignal:
-    t.Fatalf("Error response %+v", resp.Error)
-  default:
-    t.Fatalf("Unexpected response %+v", resp)
-  }
-
-  state_signal = nil
-  for _, signal := range(signals) {
-    event_state, is_event_state := signal.(*EventStateSignal)
-    if is_event_state == true && event_state.Source == event.ID && event_state.State == "running" {
-      state_signal = event_state
-      break
-    }
-  }
-
-  if state_signal == nil {
-    state_signal, err = WaitForSignal(event_listener.Chan, 10*time.Millisecond, func(sig *EventStateSignal) bool {
-      return sig.Source == event.ID && sig.State == "running"
-    })
-    fatalErr(t, err)
-  }
-
-  _, err = WaitForSignal(event_listener.Chan, time.Second * 2, func(sig *EventStateSignal) bool {
-    return sig.Source == event.ID && sig.State == "done"
-  })
-  fatalErr(t, err)
-
-  response, signals = testSend(t, ctx, NewEventControlSignal("start"), event, event)
-  switch resp := response.(type) {
-  case *SuccessSignal:
-    t.Fatalf("Success response starting finished TestEventExt")
-  case *ErrorSignal:
-  default:
-    t.Fatalf("Unexpected response %+v", resp)
-  }
-}

extension.go

@@ -1,13 +1,12 @@
 package graphvent
 
-import (
-
-)
+type Tag string
+type Changes []Tag
 
 // Extensions are data attached to nodes that process signals
 type Extension interface {
   // Called to process incoming signals, returning changes and messages to send
-  Process(*Context, *Node, NodeID, Signal) ([]SendMsg, Changes)
+  Process(*Context, *Node, NodeID, Signal) ([]Message, Changes)
 
   // Called when the node is loaded into a context(creation or move), so extension data can be initialized
   Load(*Context, *Node) error
@@ -15,10 +14,3 @@ type Extension interface {
   // Called when the node is unloaded from a context(deletion or move), so extension data can be cleaned up
   Unload(*Context, *Node)
 }
-
-// Changes are lists of modifications made to extensions to be communicated
-type Changes []string
-func (changes *Changes) Add(fields ...string) {
-  new_changes := append(*changes, fields...)
-  changes = &new_changes
-}

gql.go

@@ -249,13 +249,14 @@ func GQLHandler(ctx *Context, server *Node, gql_ext *GQLExt) func(http.ResponseW
     for header, value := range(r.Header) {
       header_map[header] = value
     }
-    ctx.Log.Logm("gql", header_map, "REQUEST_HEADERS")
 
     resolve_context, err := NewResolveContext(ctx, server, gql_ext)
     if err != nil {
       ctx.Log.Logf("gql", "GQL_AUTH_ERR: %s", err)
       json.NewEncoder(w).Encode(GQLUnauthorized(""))
       return
+    } else {
+      ctx.Log.Logf("gql", "New Query: %s", resolve_context.ID)
     }
 
     req_ctx := context.Background()
@@ -304,7 +305,6 @@ func sendOneResultAndClose(res *graphql.Result) chan *graphql.Result {
   return resultChannel
 }
 
-
 func getOperationTypeOfReq(p graphql.Params) string{
   source := source.NewSource(&source.Source{
     Body: []byte(p.RequestString),
@@ -330,18 +330,6 @@ func getOperationTypeOfReq(p graphql.Params) string{
   return "END_OF_FUNCTION"
 }
 
-func GQLWSDo(ctx * Context, p graphql.Params) chan *graphql.Result {
-  operation := getOperationTypeOfReq(p)
-  ctx.Log.Logf("gqlws", "GQLWSDO_OPERATION: %s - %+v", operation, p.RequestString)
-
-  if operation == ast.OperationTypeSubscription {
-    return graphql.Subscribe(p)
-  }
-
-  res := graphql.Do(p)
-  return sendOneResultAndClose(res)
-}
-
 func GQLWSHandler(ctx * Context, server *Node, gql_ext *GQLExt) func(http.ResponseWriter, *http.Request) {
   return func(w http.ResponseWriter, r * http.Request) {
     ctx.Log.Logf("gqlws_new", "HANDLING %s",r.RemoteAddr)
@@ -351,11 +339,12 @@ func GQLWSHandler(ctx * Context, server *Node, gql_ext *GQLExt) func(http.Respon
       header_map[header] = value
     }
 
-    ctx.Log.Logm("gql", header_map, "REQUEST_HEADERS")
     resolve_context, err := NewResolveContext(ctx, server, gql_ext)
     if err != nil {
       ctx.Log.Logf("gql", "GQL_AUTH_ERR: %s", err)
       return
+    } else {
+      ctx.Log.Logf("gql", "New Subscription: %s", resolve_context.ID)
     }
 
     req_ctx := context.Background()
@@ -429,11 +418,14 @@ func GQLWSHandler(ctx * Context, server *Node, gql_ext *GQLExt) func(http.Respon
             params.VariableValues = msg.Payload.Variables
           }
 
-          res_chan := GQLWSDo(ctx, params)
-          if res_chan == nil {
-            ctx.Log.Logf("gqlws", "res_chan is nil")
+          var res_chan chan *graphql.Result
+          operation := getOperationTypeOfReq(params)
+
+          if operation == ast.OperationTypeSubscription {
+            res_chan = graphql.Subscribe(params)
           } else {
-            ctx.Log.Logf("gqlws", "res_chan: %+v", res_chan)
+            res := graphql.Do(params)
+            res_chan = sendOneResultAndClose(res)
           }
 
           go func(res_chan chan *graphql.Result) {
@@ -509,7 +501,7 @@ type Field struct {
 type NodeResult struct {
   NodeID NodeID
   NodeType NodeType
-  Data map[ExtType]map[string]interface{}
+  Data map[string]interface{}
 }
 
 type ListField struct {
@@ -526,6 +518,7 @@ type SelfField struct {
 
 type SubscriptionInfo struct {
   ID uuid.UUID
+  NodeCache *map[NodeID]NodeResult
   Channel chan interface{}
 }
 
@@ -544,11 +537,13 @@ type GQLExt struct {
   State string `gv:"state"`
   TLSKey []byte `gv:"tls_key"`
   TLSCert []byte `gv:"tls_cert"`
-  Listen string `gv:"listen"`
+  Listen string `gv:"listen" gql:"GQLListen"`
 }
 
 func (ext *GQLExt) Load(ctx *Context, node *Node) error {
   ctx.Log.Logf("gql", "Loading GQL server extension on %s", node.ID)
+  ext.resolver_response = map[uuid.UUID]chan Signal{}
+  ext.subscriptions = []SubscriptionInfo{}
   return ext.StartGQLServer(ctx, node)
 }
 
@@ -562,14 +557,7 @@ func (ext *GQLExt) Unload(ctx *Context, node *Node) {
   }
 }
 
-func (ext *GQLExt) PostDeserialize(*Context) error {
-  ext.resolver_response = map[uuid.UUID]chan Signal{}
-  ext.subscriptions = []SubscriptionInfo{}
-
-  return nil
-}
-
-func (ext *GQLExt) AddSubscription(id uuid.UUID) (chan interface{}, error) {
+func (ext *GQLExt) AddSubscription(id uuid.UUID, ctx *ResolveContext) (chan interface{}, error) {
   ext.subscriptions_lock.Lock()
   defer ext.subscriptions_lock.Unlock()
 
@@ -583,6 +571,7 @@ func (ext *GQLExt) AddSubscription(id uuid.UUID) (chan interface{}, error) {
 
   ext.subscriptions = append(ext.subscriptions, SubscriptionInfo{
     id,
+    &ctx.NodeCache,
     c,
   })
 
@@ -630,10 +619,10 @@ func (ext *GQLExt) FreeResponseChannel(req_id uuid.UUID) chan Signal {
   return response_chan
 }
 
-func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
+func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]Message, Changes) {
   // Process ReadResultSignalType by forwarding it to the waiting resolver
   var changes Changes = nil
-  var messages []SendMsg = nil
+  var messages []Message = nil
 
   switch sig := signal.(type) {
   case *SuccessSignal:
@@ -645,8 +634,6 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
       default:
         ctx.Log.Logf("gql", "Resolver channel overflow %+v", sig)
       }
-    } else {
-      ctx.Log.Logf("gql", "received success signal response %+v with no mapped resolver", sig)
     }
 
   case *ErrorSignal:
@@ -659,9 +646,6 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
       default:
         ctx.Log.Logf("gql", "Resolver channel overflow %+v", sig)
       }
-
-    } else {
-      ctx.Log.Logf("gql", "received error signal response %+v with no mapped resolver", sig)
     }
 
   case *ReadResultSignal:
@@ -669,23 +653,22 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
     if response_chan != nil {
       select {
       case response_chan <- sig:
-        ctx.Log.Logf("gql", "Forwarded to resolver, %+v", sig)
       default:
         ctx.Log.Logf("gql", "Resolver channel overflow %+v", sig)
       }
-    } else {
-      ctx.Log.Logf("gql", "Received read result that wasn't expected - %+v", sig)
     }
 
   case *StatusSignal:
     ext.subscriptions_lock.RLock()
-    ctx.Log.Logf("gql", "forwarding status signal from %+v to resolvers %+v", sig.Source, ext.subscriptions)
-    for _, resolver := range(ext.subscriptions) {
+    for _, sub := range(ext.subscriptions) {
+      _, cached := (*sub.NodeCache)[sig.Source]
+      if cached {
         select {
-      case resolver.Channel <- sig:
-        ctx.Log.Logf("gql_subscribe", "forwarded status signal to resolver: %+v", resolver.ID)
+        case sub.Channel <- sig:
+          ctx.Log.Logf("gql", "forwarded status signal %+v to subscription: %s", sig, sub.ID)
         default:
-        ctx.Log.Logf("gql_subscribe", "resolver channel overflow: %+v", resolver.ID)
+          ctx.Log.Logf("gql", "subscription channel overflow: %s", sub.ID)
+        }
       }
     }
     ext.subscriptions_lock.RUnlock()

gql_node.go

@@ -25,7 +25,12 @@ func ResolveNodeType(p graphql.ResolveParams) (interface{}, error) {
   return uint64(node.NodeType), nil
 }
 
-func GetFieldNames(ctx *Context, selection_set *ast.SelectionSet) []string {
+type FieldIndex struct {
+  Extension ExtType
+  Tag string
+}
+
+func GetFields(selection_set *ast.SelectionSet) []string {
   names := []string{}
   if selection_set == nil {
     return names
@@ -34,10 +39,12 @@ func GetFieldNames(ctx *Context, selection_set *ast.SelectionSet) []string {
   for _, sel := range(selection_set.Selections) {
     switch field := sel.(type) {
     case *ast.Field:
+      if field.Name.Value == "ID" || field.Name.Value == "Type" {
+        continue
+      }
       names = append(names, field.Name.Value)
     case *ast.InlineFragment:
-    default:
-      ctx.Log.Logf("gql", "Unknown selection type: %s", reflect.TypeOf(field))
+      names = append(names, GetFields(field.SelectionSet)...)
     }
   }
 
@@ -45,68 +52,65 @@ func GetFieldNames(ctx *Context, selection_set *ast.SelectionSet) []string {
 }
 
 // Returns the fields that need to be resolved
-func GetResolveFields(id NodeID, ctx *ResolveContext, p graphql.ResolveParams) (map[ExtType][]string, error) {
-  node_info, mapped := ctx.Context.NodeTypes[p.Info.ReturnType.Name()]
-  if mapped == false {
-    return nil, fmt.Errorf("No NodeType %s", p.Info.ReturnType.Name())
-  }
-
-  fields := map[ExtType][]string{}
-  names := []string{}
+func GetResolveFields(p graphql.ResolveParams) []string {
+  fields := []string{}
   for _, field := range(p.Info.FieldASTs) {
-    names = append(names, GetFieldNames(ctx.Context, field.SelectionSet)...)
+    fields = append(fields, GetFields(field.SelectionSet)...)
   }
 
-  cache, node_cached := ctx.NodeCache[id]
-  for _, name := range(names) {
-    if name == "ID" || name == "Type" {
-      continue
+  return fields
 }
 
-    ext_type, field_mapped := node_info.Fields[name]
-    if field_mapped == false {
-      return nil, fmt.Errorf("NodeType %s does not have field %s", p.Info.ReturnType.Name(), name)
+func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
+  ctx, err := PrepResolve(p)
+  if err != nil {
+    return NodeResult{}, err
   }
 
-    ext_fields, exists := fields[ext_type]
-    if exists == false {
-      ext_fields = []string{}
+  switch source := p.Source.(type) {
+  case *StatusSignal:
+    cached_node, cached := ctx.NodeCache[source.Source]
+    if cached {
+      for _, field_name := range(source.Fields) {
+        _, cached := cached_node.Data[field_name]
+        if cached {
+          delete(cached_node.Data, field_name)
         }
-
-    if node_cached {
-      ext_cache, ext_cached := cache.Data[ext_type]
-      if ext_cached {
-        _, field_cached := ext_cache[name]
-        if field_cached {
-          continue
       }
+      ctx.NodeCache[source.Source] = cached_node
     }
   }
 
-    fields[ext_type] = append(ext_fields, name)
+  cache, node_cached := ctx.NodeCache[id]
+  fields := GetResolveFields(p) 
+  var not_cached []string
+  if node_cached {
+    not_cached = []string{}
+    for _, field := range(fields) {
+      if node_cached {
+        _, field_cached := cache.Data[field]
+        if field_cached {
+          continue
         }
-  
-  return fields, nil
       }
 
-func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
-  ctx, err := PrepResolve(p)
-  if err != nil {
-    return NodeResult{}, err
+      not_cached = append(not_cached, field)
     }
-
-  fields, err := GetResolveFields(id, ctx, p)
-  if err != nil {
-    return NodeResult{}, err
+  } else {
+    not_cached = fields
   }
 
-  ctx.Context.Log.Logf("gql", "Resolving fields %+v on node %s", fields, id)
+  if (len(not_cached) == 0) && (node_cached == true) {
+    ctx.Context.Log.Logf("gql", "No new fields to resolve for %s", id)
+    return cache, nil
+  } else {
+    ctx.Context.Log.Logf("gql", "Resolving fields %+v on node %s", not_cached, id)
 
-  signal := NewReadSignal(fields)
+    signal := NewReadSignal(not_cached)
     response_chan := ctx.Ext.GetResponseChannel(signal.ID())
     // TODO: TIMEOUT DURATION
-  err = ctx.Context.Send(ctx.Server, []SendMsg{{
-    Dest: id,
+    err = ctx.Context.Send(ctx.Server, []Message{{
+      Node: id,
       Signal: signal,
     }})
     if err != nil {
@@ -122,25 +126,15 @@ func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
 
     switch response := response.(type) {
     case *ReadResultSignal:
-    cache, node_cached := ctx.NodeCache[id]
       if node_cached == false {
         cache = NodeResult{
           NodeID: id,
           NodeType: response.NodeType,
-        Data: response.Extensions,
+          Data: response.Fields,
         }
       } else {
-      for ext_type, ext_data := range(response.Extensions) {
-        cached_ext, ext_cached := cache.Data[ext_type]
-        if ext_cached {
-          for field_name, field := range(ext_data) {
-            cache.Data[ext_type][field_name] = field
-          }
-        } else {
-          cache.Data[ext_type] = ext_data
-        }
-
-        cache.Data[ext_type] = cached_ext
+        for field_name, field_value := range(response.Fields) {
+          cache.Data[field_name] = field_value
         }
       }
 
@@ -150,3 +144,4 @@ func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
       return NodeResult{}, fmt.Errorf("Bad read response: %+v", response)
     }
   }
+}

gql_test.go

@@ -1,162 +1,49 @@
 package graphvent
 
-/*import (
-  "testing"
-  "time"
-  "fmt"
+import (
+	"bytes"
+	"crypto/tls"
 	"encoding/json"
+	"fmt"
 	"io"
-  "net/http"
 	"net"
-  "crypto/tls"
-  "crypto/rand"
-  "crypto/ed25519"
-  "bytes"
-  "golang.org/x/net/websocket"
+	"net/http"
+	"reflect"
+	"testing"
+	"time"
+
 	"github.com/google/uuid"
+	"golang.org/x/net/websocket"
 )
 
-func TestGQLAuth(t *testing.T) {
-  ctx := logTestContext(t, []string{"test"})
-
-  listener_1 := NewListenerExt(10)
-  node_1, err := NewNode(ctx, nil, "Base", 10, nil, listener_1)
-  fatalErr(t, err)
-  
-  listener_2 := NewListenerExt(10)
-  node_2, err := NewNode(ctx, nil, "Base", 10, nil, listener_2)
-  fatalErr(t, err)
-
-  auth_header, err := AuthB64(node_1.Key, node_2.Key.Public().(ed25519.PublicKey))
-  fatalErr(t, err)
-
-  auth, err := ParseAuthB64(auth_header, node_2.Key)
-  fatalErr(t, err)
-
-  err = ValidateAuthorization(Authorization{
-    AuthInfo: auth.AuthInfo,
-    Key: auth.Key.Public().(ed25519.PublicKey),
-  }, time.Second)
-  fatalErr(t, err)
-
-  ctx.Log.Logf("test", "AUTH: %+v", auth)
-}
+func TestGQLSubscribe(t *testing.T) {
+  ctx := logTestContext(t, []string{"test", "gql"})
 
-func TestGQLServer(t *testing.T) {
-  ctx := logTestContext(t, []string{"test", "gqlws", "gql"})
-
-  pub, gql_key, err := ed25519.GenerateKey(rand.Reader)
+  n1, err := ctx.NewNode(nil, "LockableNode", NewLockableExt(nil))
   fatalErr(t, err)
-  gql_id := KeyID(pub)
 
-  group_policy_1 := NewAllNodesPolicy(Tree{
-    SerializedType(SignalTypeFor[ReadSignal]()): Tree{
-      SerializedType(ExtTypeFor[GroupExt]()): Tree{
-        SerializedType(GetFieldTag("members")): Tree{},
-      },
-    },
-    SerializedType(SignalTypeFor[ReadResultSignal]()): nil,
-    SerializedType(SignalTypeFor[ErrorSignal]()): nil,
-  })
-
-  group_policy_2 := NewMemberOfPolicy(map[NodeID]map[string]Tree{
-    gql_id: {
-      "test_group": {
-        SerializedType(SignalTypeFor[LinkSignal]()): nil,
-        SerializedType(SignalTypeFor[LockSignal]()): nil,
-        SerializedType(SignalTypeFor[StatusSignal]()): nil,
-        SerializedType(SignalTypeFor[ReadSignal]()): nil,
-      },
-    },
-  })
-
-  user_policy_1 := NewAllNodesPolicy(Tree{
-    SerializedType(SignalTypeFor[ReadResultSignal]()): nil,
-    SerializedType(SignalTypeFor[ErrorSignal]()): nil,
-  })
-
-  user_policy_2 := NewMemberOfPolicy(map[NodeID]map[string]Tree{
-    gql_id: {
-      "test_group": {
-        SerializedType(SignalTypeFor[LinkSignal]()): nil,
-        SerializedType(SignalTypeFor[ReadSignal]()): nil,
-        SerializedType(SignalTypeFor[LockSignal]()): nil,
-      },
-    },
-  })
+  listener_ext := NewListenerExt(10)
 
   gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
   fatalErr(t, err)
 
-  listener_ext := NewListenerExt(10)
-  n1, err := NewNode(ctx, nil, "Base", 10, []Policy{user_policy_2, user_policy_1}, NewLockableExt(nil))
+  gql, err := ctx.NewNode(nil, "LockableNode", NewLockableExt([]NodeID{n1.ID}), gql_ext, listener_ext)
   fatalErr(t, err)
 
-  gql, err := NewNode(ctx, gql_key, "Base", 10, []Policy{group_policy_2, group_policy_1},
-  NewLockableExt([]NodeID{n1.ID}), gql_ext, NewGroupExt(map[string][]NodeID{"test_group": {n1.ID, gql_id}}), listener_ext)
-  fatalErr(t, err)
+  query := "subscription { Self { ID, Type ... on Lockable { LockableState } } }"
 
   ctx.Log.Logf("test", "GQL:  %s", gql.ID)
-  ctx.Log.Logf("test", "NODE: %s", n1.ID)
+  ctx.Log.Logf("test", "Node: %s", n1.ID)
+  ctx.Log.Logf("test", "Query: %s", query)
 
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
-    return sig.Source == gql_id
-  })
-  fatalErr(t, err)
-
-  skipVerifyTransport := &http.Transport{
-    TLSClientConfig:       &tls.Config{InsecureSkipVerify: true},
+  sub_1 := GQLPayload{
+    Query: query,
   }
-  client := &http.Client{Transport: skipVerifyTransport}
+
   port := gql_ext.tcp_listener.Addr().(*net.TCPAddr).Port
   url := fmt.Sprintf("http://localhost:%d/gql", port)
   ws_url := fmt.Sprintf("ws://127.0.0.1:%d/gqlws", port)
 
-  req_1 := GQLPayload{
-    Query: "query Node($id:String) { Node(id:$id) { ID, TypeHash } }",
-    Variables: map[string]interface{}{
-      "id": n1.ID.String(),
-    },
-  }
-
-  req_2 := GQLPayload{
-    Query: "query Node($id:String) { Node(id:$id) { ID, TypeHash, ... on GQLServer { SubGroups { Name, Members { ID } } , Listen, Requirements { ID, TypeHash Owner { ID } } } } }",
-    Variables: map[string]interface{}{
-      "id": gql.ID.String(),
-    },
-  }
-
-  auth_header, err := AuthB64(n1.Key, gql.Key.Public().(ed25519.PublicKey))
-  fatalErr(t, err)
-
-  SendGQL := func(payload GQLPayload) []byte {
-    ser, err := json.MarshalIndent(&payload, "", "  ")
-    fatalErr(t, err)
-
-    req_data := bytes.NewBuffer(ser)
-    req, err := http.NewRequest("GET", url, req_data)
-    fatalErr(t, err)
-
-    req.Header.Add("Authorization", auth_header)
-    resp, err := client.Do(req)
-    fatalErr(t, err)
-
-    body, err := io.ReadAll(resp.Body)
-    fatalErr(t, err)
-
-    resp.Body.Close()
-    return body
-  }
-
-  resp_1 := SendGQL(req_1)
-  ctx.Log.Logf("test", "RESP_1: %s", resp_1)
-  resp_2 := SendGQL(req_2)
-  ctx.Log.Logf("test", "RESP_2: %s", resp_2)
-
-  sub_1 := GQLPayload{
-    Query: "subscription { Self { ID, TypeHash, ... on Lockable { Requirements { ID }}}}",
-  }
-
   SubGQL := func(payload GQLPayload) {
     config, err := websocket.NewConfig(ws_url, url)
     fatalErr(t, err)
@@ -174,11 +61,9 @@ func TestGQLServer(t *testing.T) {
     init := struct{
       ID uuid.UUID `json:"id"`
       Type string `json:"type"`
-      Payload payload_struct `json:"payload"`
     }{
       uuid.New(),
       "connection_init",
-      payload_struct{ auth_header },
     }
 
     ser, err := json.Marshal(&init)
@@ -211,75 +96,128 @@ func TestGQLServer(t *testing.T) {
 
     n, err = ws.Read(resp)
     fatalErr(t, err)
-    ctx.Log.Logf("test", "SUB: %s", resp[:n])
+    ctx.Log.Logf("test", "SUB1: %s", resp[:n])
 
-    msgs := Messages{}
-    test_changes := Changes{}
-    AddChange[GQLExt](test_changes, "state")
-    msgs = msgs.Add(ctx, gql.ID, gql, nil, NewStatusSignal(gql.ID, test_changes))
-    err = ctx.Send(msgs)
+    lock_id, err := LockLockable(ctx, gql)
     fatalErr(t, err)
 
+    response, _, err := WaitForResponse(listener_ext.Chan, 100*time.Millisecond, lock_id)
+    fatalErr(t, err)
+
+    switch response.(type) {
+    case *SuccessSignal:
+      ctx.Log.Logf("test", "Locked %s", gql.ID)
+    default:
+      t.Errorf("Unexpected lock response: %s", response)
+    }
+
     n, err = ws.Read(resp)
     fatalErr(t, err)
-    ctx.Log.Logf("test", "SUB: %s", resp[:n])
+    ctx.Log.Logf("test", "SUB2: %s", resp[:n])
+
+    n, err = ws.Read(resp)
+    fatalErr(t, err)
+    ctx.Log.Logf("test", "SUB3: %s", resp[:n])
 
     // TODO: check that there are no more messages sent to ws within a timeout
   }
 
   SubGQL(sub_1)
+}
 
-  msgs := Messages{}
-  msgs = msgs.Add(ctx, gql.ID, gql, nil, NewStopSignal())
-  err = ctx.Send(msgs)
+func TestGQLQuery(t *testing.T) {
+  ctx := logTestContext(t, []string{"test", "lockable"})
+
+  n1_listener := NewListenerExt(10)
+  n1, err := ctx.NewNode(nil, "LockableNode", NewLockableExt(nil), n1_listener)
   fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StoppedSignal) bool {
-    return sig.Source == gql_id
-  })
+
+  gql_listener := NewListenerExt(10)
+  gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
+  fatalErr(t, err)
+
+  gql, err := ctx.NewNode(nil, "LockableNode", NewLockableExt([]NodeID{n1.ID}), gql_ext, gql_listener)
   fatalErr(t, err)
+
+  ctx.Log.Logf("test", "GQL:  %s", gql.ID)
+  ctx.Log.Logf("test", "NODE: %s", n1.ID)
+
+  skipVerifyTransport := &http.Transport{
+    TLSClientConfig:       &tls.Config{InsecureSkipVerify: true},
   }
+  client := &http.Client{Transport: skipVerifyTransport}
+  port := gql_ext.tcp_listener.Addr().(*net.TCPAddr).Port
+  url := fmt.Sprintf("http://localhost:%d/gql", port)
 
-func TestGQLDB(t *testing.T) {
-  ctx := logTestContext(t, []string{"test", "db", "node"})
+  req_1 := GQLPayload{
+    Query: "query Node($id:graphvent_NodeID) { Node(id:$id) { ID, Type, ... on Lockable { LockableState } } }",
+    Variables: map[string]interface{}{
+      "id": n1.ID.String(),
+    },
+  }
 
-  u1, err := NewNode(ctx, nil, "Base", 10, nil)
+  req_2 := GQLPayload{
+    Query: "query Self { Self { ID, Type, ... on Lockable { LockableState, Requirements { Key { ID ... on Lockable { LockableState } } } } } }",
+  }
+
+  SendGQL := func(payload GQLPayload) []byte {
+    ser, err := json.MarshalIndent(&payload, "", "  ")
     fatalErr(t, err)
 
-  ctx.Log.Logf("test", "U1_ID: %s", u1.ID)
+    req_data := bytes.NewBuffer(ser)
+    req, err := http.NewRequest("GET", url, req_data)
+    fatalErr(t, err)
+
+    resp, err := client.Do(req)
+    fatalErr(t, err)
+
+    body, err := io.ReadAll(resp.Body)
+    fatalErr(t, err)
+
+    resp.Body.Close()
+    return body
+  }
+
+  resp_1 := SendGQL(req_1)
+  ctx.Log.Logf("test", "RESP_1: %s", resp_1)
+  resp_2 := SendGQL(req_2)
+  ctx.Log.Logf("test", "RESP_2: %s", resp_2)
+
+  lock_id, err := LockLockable(ctx, n1)
+  fatalErr(t, err)
+
+  response, _, err := WaitForResponse(n1_listener.Chan, 100*time.Millisecond, lock_id)
+  fatalErr(t, err)
+  switch response := response.(type) {
+  case *SuccessSignal:
+  default:
+    t.Fatalf("Wrong response: %s", reflect.TypeOf(response))
+  }
+
+  resp_3 := SendGQL(req_1)
+  ctx.Log.Logf("test", "RESP_3: %s", resp_3)
+
+  resp_4 := SendGQL(req_2)
+  ctx.Log.Logf("test", "RESP_4: %s", resp_4)
+}
+
+func TestGQLDB(t *testing.T) {
+  ctx := logTestContext(t, []string{"test", "db", "node", "serialize"})
 
   gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
   fatalErr(t, err)
   listener_ext := NewListenerExt(10)
-  gql, err := NewNode(ctx, nil, "Base", 10, nil,
-                 gql_ext,
-                 listener_ext,
-                 NewGroupExt(nil))
+
+  gql, err := ctx.NewNode(nil, "Node", gql_ext, listener_ext)
   fatalErr(t, err)
   ctx.Log.Logf("test", "GQL_ID: %s", gql.ID)
   
-  msgs := Messages{}
-  msgs = msgs.Add(ctx, gql.ID, gql, nil, NewStopSignal())
-  err = ctx.Send(msgs)
-  fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StoppedSignal) bool {
-    return sig.Source == gql.ID
-  })
+  err = ctx.Stop()
   fatalErr(t, err)
 
-  // Clear all loaded nodes from the context so it loads them from the database
-  ctx.nodeMap = map[NodeID]*Node{}
-  gql_loaded, err := LoadNode(ctx, gql.ID)
+  gql_loaded, err := ctx.GetNode(gql.ID)
   fatalErr(t, err)
 
   listener_ext, err = GetExt[ListenerExt](gql_loaded)
   fatalErr(t, err)
-  msgs = Messages{}
-  msgs = msgs.Add(ctx, gql_loaded.ID, gql_loaded, nil, NewStopSignal())
-  err = ctx.Send(msgs)
-  fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StoppedSignal) bool {
-    return sig.Source == gql_loaded.ID
-  })
-  fatalErr(t, err)
 }
-*/

graph_test.go

@@ -9,27 +9,20 @@ import (
 
 func NewSimpleListener(ctx *Context, buffer int) (*Node, *ListenerExt, error) {
   listener_extension := NewListenerExt(buffer)
-  listener, err := NewNode(ctx,
-                      nil,
-                      "LockableListener",
-                      10,
-                      nil,
-                      listener_extension,
-                      NewLockableExt(nil))
+  listener, err := ctx.NewNode(nil, "LockableNode", nil, listener_extension, NewLockableExt(nil))
 
   return listener, listener_extension, err
 }
 
 func logTestContext(t * testing.T, components []string) *Context {
-  db, err := badger.Open(badger.DefaultOptions("").WithInMemory(true))
+  db, err := badger.Open(badger.DefaultOptions("").WithInMemory(true).WithSyncWrites(true))
   if err != nil {
     t.Fatal(err)
   }
 
-  ctx, err := NewContext(db, NewConsoleLogger(components))
-  fatalErr(t, err)
-
-  err = RegisterNodeType(ctx, "LockableListener", []ExtType{ExtTypeFor[ListenerExt](), ExtTypeFor[LockableExt]()})
+  ctx, err := NewContext(&BadgerDB{
+    DB: db,
+  }, NewConsoleLogger(components))
   fatalErr(t, err)
 
   return ctx
@@ -50,7 +43,7 @@ func testSend(t *testing.T, ctx *Context, signal Signal, source, destination *No
   source_listener, err := GetExt[ListenerExt](source)
   fatalErr(t, err)
 
-  messages := []SendMsg{{destination.ID, signal}}
+  messages := []Message{{destination.ID, signal}}
   fatalErr(t, ctx.Send(source, messages))
 
   response, signals, err := WaitForResponse(source_listener.Chan, time.Millisecond*10, signal.ID())

listener.go

@@ -10,12 +10,35 @@ type ListenerExt struct {
   Chan chan Signal
 }
 
+type LoadedSignal struct {
+  SignalHeader
+}
+
+func NewLoadedSignal() *LoadedSignal {
+  return &LoadedSignal{
+    SignalHeader: NewSignalHeader(),
+  }
+}
+
+type UnloadedSignal struct {
+  SignalHeader
+}
+
+func NewUnloadedSignal() *UnloadedSignal {
+  return &UnloadedSignal{
+    SignalHeader: NewSignalHeader(),
+  }
+}
+
 func (ext *ListenerExt) Load(ctx *Context, node *Node) error {
   ext.Chan = make(chan Signal, ext.Buffer)
+  ext.Chan <- NewLoadedSignal()
   return nil
 }
 
 func (ext *ListenerExt) Unload(ctx *Context, node *Node) {
+  ext.Chan <- NewUnloadedSignal()
+  close(ext.Chan)
 }
 
 // Create a new listener extension with a given buffer size
@@ -27,7 +50,7 @@ func NewListenerExt(buffer int) *ListenerExt {
 }
 
 // Send the signal to the channel, logging an overflow if it occurs
-func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
+func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]Message, Changes) {
   ctx.Log.Logf("listener", "%s - %+v", node.ID, reflect.TypeOf(signal))
   ctx.Log.Logf("listener_debug", "%s->%s - %+v", source, node.ID, signal)
   select {
@@ -37,7 +60,7 @@ func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal
   }
   switch sig := signal.(type) {
   case *StatusSignal:
-    ctx.Log.Logf("listener_status", "%s - %+v", sig.Source, sig.Changes)
+    ctx.Log.Logf("listener_status", "%s - %+v", sig.Source, sig.Fields)
   }
   return nil, nil
 }

lockable.go

@@ -2,7 +2,6 @@ package graphvent
 
 import (
 	"github.com/google/uuid"
-  "time"
 )
 
 type ReqState byte
@@ -22,399 +21,389 @@ var ReqStateStrings = map[ReqState]string {
   AbortingLock: "AbortingLock",
 }
 
+func (state ReqState) String() string {
+  str, mapped := ReqStateStrings[state]
+  if mapped == false {
+    return "UNKNOWN_REQSTATE"
+  } else {
+    return str
+  }
+}
+
+
 type LockableExt struct{
   State ReqState `gv:"state"`
   ReqID *uuid.UUID `gv:"req_id"`
-  Owner *NodeID `gv:"owner" node:"Base"`
-  PendingOwner *NodeID `gv:"pending_owner" node:"Base"`
-  PendingID uuid.UUID `gv:"pending_id"`
+  Owner *NodeID `gv:"owner"`
+  PendingOwner *NodeID `gv:"pending_owner"`
   Requirements map[NodeID]ReqState `gv:"requirements" node:"Lockable:"`
-  WaitInfos WaitMap `gv:"wait_infos" node:":Base"`
+
+  Locked map[NodeID]any
+  Unlocked map[NodeID]any
+
+  Waiting WaitMap `gv:"waiting_locks" node:":Lockable"`
 }
 
 func NewLockableExt(requirements []NodeID) *LockableExt {
   var reqs map[NodeID]ReqState = nil
-  if requirements != nil {
+  var unlocked map[NodeID]any = map[NodeID]any{}
+
+  if len(requirements) != 0 {
     reqs = map[NodeID]ReqState{}
-    for _, id := range(requirements) {
-      reqs[id] = Unlocked
+    for _, req := range(requirements) {
+      reqs[req] = Unlocked
+      unlocked[req] = nil
     }
   }
+
   return &LockableExt{
     State: Unlocked,
     Owner: nil,
     PendingOwner: nil,
     Requirements: reqs,
-    WaitInfos: WaitMap{},
+    Waiting: WaitMap{},
+
+    Locked: map[NodeID]any{},
+    Unlocked: unlocked,
   }
 }
 
 func UnlockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
-  signal := NewLockSignal("unlock")
-  messages := []SendMsg{{node.ID, signal}}
+  signal := NewUnlockSignal()
+  messages := []Message{{node.ID, signal}}
   return signal.ID(), ctx.Send(node, messages)
 }
 
 func LockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
-  signal := NewLockSignal("lock")
-  messages := []SendMsg{{node.ID, signal}}
+  signal := NewLockSignal()
+  messages := []Message{{node.ID, signal}}
   return signal.ID(), ctx.Send(node, messages)
 }
 
 func (ext *LockableExt) Load(ctx *Context, node *Node) error {
-  return nil
-}
+  ext.Locked = map[NodeID]any{}
+  ext.Unlocked = map[NodeID]any{}
 
-func (ext *LockableExt) Unload(ctx *Context, node *Node) {
-}
-
-func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes Changes = nil
-
-  info, info_found := node.ProcessResponse(ext.WaitInfos, signal)
-  if info_found {
-    state, found := ext.Requirements[info.Destination]
-    if found == true {
-      changes.Add("wait_infos")
-      ctx.Log.Logf("lockable", "got mapped response %+v for %+v in state %s while in %s", signal, info, ReqStateStrings[state], ReqStateStrings[ext.State])
-      switch ext.State {
-      case AbortingLock:
-        ext.Requirements[info.Destination] = Unlocked
-        all_unlocked := true
-        for _, state := range(ext.Requirements) {
-          if state != Unlocked {
-            all_unlocked = false
-            break
-          }
-        }
-        if all_unlocked == true {
-          changes.Add("state")
-          ext.State = Unlocked
-        }
-      case Locking:
-        changes.Add("state")
-        ext.Requirements[info.Destination] = Unlocked
-        unlocked := 0
-        for _, state := range(ext.Requirements) {
-          if state == Unlocked {
-            unlocked += 1
-          }
-        }
-
-        if unlocked == len(ext.Requirements) {
-          ctx.Log.Logf("lockable", "%s unlocked from error %s from %s", node.ID, signal.Error, source)
-          ext.State = Unlocked
-        } else {
-          ext.State = AbortingLock
   for id, state := range(ext.Requirements) {
-            if state == Locked {
-              ext.Requirements[id] = Unlocking
-              lock_signal := NewLockSignal("unlock")
-              ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("unlock", id, lock_signal, 100*time.Millisecond)
-              messages = append(messages, SendMsg{id, lock_signal})
-              ctx.Log.Logf("lockable", "sent abort unlock to %s from %s", id, node.ID)
+    if state == Unlocked {
+      ext.Unlocked[id] = nil
+    } else if state == Locked {
+      ext.Locked[id] = nil
     }
   }
+  return nil
 }
 
-      case Unlocking:
-        ext.Requirements[info.Destination] = Locked
-        all_returned := true
-        for _, state := range(ext.Requirements) {
-          if state == Unlocking {
-            all_returned = false
-            break
-          }
-        }
-        if all_returned == true {
-          ext.State = Locked
-        }
-      }
-    } else {
-      ctx.Log.Logf("lockable", "Got mapped error %s, but %s isn't a requirement", signal, info.Destination)
-    }
+func (ext *LockableExt) Unload(ctx *Context, node *Node) {
+  return
 }
 
-  return messages, changes
-}
+// Handle link signal by adding/removing the requested NodeID
+// returns an error if the node is not unlocked
+func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID, signal *LinkSignal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
 
-func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID, signal *LinkSignal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
-  if ext.State == Unlocked {
+  switch ext.State {
+  case Unlocked:
     switch signal.Action {
     case "add":
       _, exists := ext.Requirements[signal.NodeID]
       if exists == true {
-        messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "already_requirement")})
+        messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "already_requirement")})
       } else {
         if ext.Requirements == nil {
           ext.Requirements = map[NodeID]ReqState{}
         }
         ext.Requirements[signal.NodeID] = Unlocked
-        changes.Add("requirements")
-        messages = append(messages, SendMsg{source, NewSuccessSignal(signal.ID())})
+        changes = append(changes, "requirements")
+        messages = append(messages, Message{source, NewSuccessSignal(signal.ID())})
       }
     case "remove":
       _, exists := ext.Requirements[signal.NodeID]
       if exists == false {
-        messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "can't link: not_requirement")})
+        messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "not_requirement")})
       } else {
         delete(ext.Requirements, signal.NodeID)
-        changes.Add("requirements")
-        messages = append(messages, SendMsg{source, NewSuccessSignal(signal.ID())})
+        changes = append(changes, "requirements")
+        messages = append(messages, Message{source, NewSuccessSignal(signal.ID())})
       }
     default:
-      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "unknown_action")})
-    }
-  } else {
-    messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_unlocked")})
+      messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "unknown_action")})
     }
-  return messages, changes
+  default:
+    messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "not_unlocked: %s", ext.State)})
   }
 
-func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source NodeID, signal *SuccessSignal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
-  if source == node.ID {
   return messages, changes
 }
 
-  info, info_found := node.ProcessResponse(ext.WaitInfos, signal)
-  if info_found == true {
-    state, found := ext.Requirements[info.Destination]
-    if found == false {
-      ctx.Log.Logf("lockable", "Got success signal for requirement that is no longer in the map(%s), ignoring...", info.Destination)
-    } else {
-      ctx.Log.Logf("lockable", "got mapped response %+v for %+v in state %s", signal, info, ReqStateStrings[state])
-      switch state {
-      case Locking:
+// Handle an UnlockSignal by either transitioning to Unlocked state,
+// sending unlock signals to requirements, or returning an error signal
+func (ext *LockableExt) HandleUnlockSignal(ctx *Context, node *Node, source NodeID, signal *UnlockSignal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
+
   switch ext.State {
-        case Locking:
-          ext.Requirements[info.Destination] = Locked
-          locked := 0
-          for _, s := range(ext.Requirements) {
-            if s == Locked {
-              locked += 1
-            }
-          }
-          if locked == len(ext.Requirements) {
-            ctx.Log.Logf("lockable", "WHOLE LOCK: %s - %s - %+v", node.ID, ext.PendingID, ext.PendingOwner)
-            ext.State = Locked
-            ext.Owner = ext.PendingOwner
-            changes.Add("state", "owner", "requirements")
-            messages = append(messages, SendMsg{*ext.Owner, NewSuccessSignal(ext.PendingID)})
+  case Locked:
+    if source != *ext.Owner {
+      messages = append(messages, Message{source, NewErrorSignal(signal.Id, "not_owner")})
     } else {
-            changes.Add("requirements")
-            ctx.Log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, len(ext.Requirements))
-          }
-        case AbortingLock:
-          ext.Requirements[info.Destination] = Unlocking
-
-          lock_signal := NewLockSignal("unlock")
-          ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("unlock", info.Destination, lock_signal, 100*time.Millisecond)
-          messages = append(messages, SendMsg{info.Destination, lock_signal})
+      if len(ext.Requirements) == 0 {
+        changes = append(changes, "state", "owner", "pending_owner")
 
-          ctx.Log.Logf("lockable", "sending abort_lock to %s for %s", info.Destination, node.ID)
-        }
-      case AbortingLock:
-        ctx.Log.Logf("lockable", "Got success signal in AbortingLock %s", node.ID)
-        fallthrough
-      case Unlocking:
-        ext.Requirements[source] = Unlocked
+        ext.Owner = nil
 
-        unlocked := 0
-        for _, s := range(ext.Requirements) {
-          if s == Unlocked {
-            unlocked += 1
-          }
-        }
+        ext.PendingOwner = nil
 
-        if unlocked == len(ext.Requirements) {
-          old_state := ext.State
         ext.State = Unlocked
-          ctx.Log.Logf("lockable", "WHOLE UNLOCK: %s - %s - %+v", node.ID, ext.PendingID, ext.PendingOwner)
-          if old_state == Unlocking {
-            previous_owner := *ext.Owner
-            ext.Owner = ext.PendingOwner
-            ext.ReqID = nil
-            changes.Add("state", "owner", "req_id")
-            messages = append(messages, SendMsg{previous_owner, NewSuccessSignal(ext.PendingID)})
-          } else if old_state == AbortingLock {
-            changes.Add("state", "pending_owner")
-            messages = append(messages, SendMsg{*ext.PendingOwner, NewErrorSignal(*ext.ReqID, "not_unlocked")})
-            ext.PendingOwner = ext.Owner
-          }
+
+        messages = append(messages, Message{source, NewSuccessSignal(signal.Id)})
       } else {
-          changes.Add("state")
-          ctx.Log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, len(ext.Requirements))
+        changes = append(changes, "state", "waiting", "requirements", "pending_owner")
+
+        ext.PendingOwner = nil
+
+        ext.ReqID = &signal.Id
+
+        ext.State = Unlocking
+        for id := range(ext.Requirements) {
+          unlock_signal := NewUnlockSignal()
+
+          ext.Waiting[unlock_signal.Id] = id
+          ext.Requirements[id] = Unlocking
+
+          messages = append(messages, Message{id, unlock_signal})
         }
       }
     }
+  default:
+    messages = append(messages, Message{source, NewErrorSignal(signal.Id, "not_locked")})
   }
 
   return messages, changes
 }
 
-// Handle a LockSignal and update the extensions owner/requirement states
-func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
+// Handle a LockSignal by either transitioning to a locked state,
+// sending lock signals to requirements, or returning an error signal
+func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
 
-  switch signal.State {
-  case "lock":
   switch ext.State {
   case Unlocked:
     if len(ext.Requirements) == 0 {
+      changes = append(changes, "state", "owner", "pending_owner")
+
+      ext.Owner = &source
+
+      ext.PendingOwner = &source
+
       ext.State = Locked
-        new_owner := source
-        ext.PendingOwner = &new_owner
-        ext.Owner = &new_owner
-        changes.Add("state", "pending_owner", "owner")
-        messages = append(messages, SendMsg{new_owner, NewSuccessSignal(signal.ID())})
+      messages = append(messages, Message{source, NewSuccessSignal(signal.Id)})
     } else {
+      changes = append(changes, "state", "requirements", "waiting", "pending_owner")
+
+      ext.PendingOwner = &source
+
+      ext.ReqID = &signal.Id
+
       ext.State = Locking
-        id := signal.ID()
-        ext.ReqID = &id
-        new_owner := source
-        ext.PendingOwner = &new_owner
-        ext.PendingID = signal.ID()
-        changes.Add("state", "req_id", "pending_owner", "pending_id")
-        for id, state := range(ext.Requirements) {
-          if state != Unlocked {
-            ctx.Log.Logf("lockable", "REQ_NOT_UNLOCKED_WHEN_LOCKING")
-          }
+      for id := range(ext.Requirements) {
+        lock_signal := NewLockSignal()
 
-          lock_signal := NewLockSignal("lock")
-          ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("lock", id, lock_signal, 500*time.Millisecond)
+        ext.Waiting[lock_signal.Id] = id
         ext.Requirements[id] = Locking
 
-          messages = append(messages, SendMsg{id, lock_signal})
+        messages = append(messages, Message{id, lock_signal})
       }
     }
   default:
-      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_unlocked")})
-      ctx.Log.Logf("lockable", "Tried to lock %s while %s", node.ID, ext.State)
+    messages = append(messages, Message{source, NewErrorSignal(signal.Id, "not_unlocked: %s", ext.State)})
   }
-  case "unlock":
-    if ext.State == Locked {
-      if len(ext.Requirements) == 0 {
+
+  return messages, changes
+}
+
+// Handle an error signal by aborting the lock, or retrying the unlock
+func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
+
+  id, waiting := ext.Waiting[signal.ReqID]
+  if waiting == true {
+    delete(ext.Waiting, signal.ReqID)
+    changes = append(changes, "waiting")
+
+    switch ext.State {
+    case Locking:
+      changes = append(changes, "state", "requirements")
+
+      ext.Requirements[id] = Unlocked
+
+      unlocked := 0
+      for req_id, req_state := range(ext.Requirements) {
+        // Unlock locked requirements, and count unlocked requirements
+        switch req_state {
+        case Locked:
+          unlock_signal := NewUnlockSignal()
+
+          ext.Waiting[unlock_signal.Id] = req_id
+          ext.Requirements[req_id] = Unlocking
+
+          messages = append(messages, Message{req_id, unlock_signal})
+        case Unlocked:
+          unlocked += 1
+        }
+      }
+
+      if unlocked == len(ext.Requirements) {
+        changes = append(changes, "owner", "state")
         ext.State = Unlocked
-        new_owner := source
-        ext.PendingOwner = nil
         ext.Owner = nil
-        changes.Add("state", "pending_owner", "owner")
-        messages = append(messages, SendMsg{new_owner, NewSuccessSignal(signal.ID())})
-      } else if source == *ext.Owner {
-        ext.State = Unlocking
-        id := signal.ID()
-        ext.ReqID = &id
-        ext.PendingOwner = nil
-        ext.PendingID = signal.ID()
-        changes.Add("state", "pending_owner", "pending_id", "req_id")
-        for id, state := range(ext.Requirements) {
-          if state != Locked {
-            ctx.Log.Logf("lockable", "REQ_NOT_LOCKED_WHEN_UNLOCKING")
+      } else {
+        changes = append(changes, "state")
+        ext.State = AbortingLock
       }
 
-          lock_signal := NewLockSignal("unlock")
-          ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("unlock", id, lock_signal, 100*time.Millisecond)
-          ext.Requirements[id] = Unlocking
+    case Unlocking:
+      unlock_signal := NewUnlockSignal()
+      ext.Waiting[unlock_signal.Id] = id
+      messages = append(messages, Message{id, unlock_signal})
 
-          messages = append(messages, SendMsg{id, lock_signal})
+    case AbortingLock:
+      req_state := ext.Requirements[id]
+      // Mark failed lock as Unlocked, or retry unlock
+      switch req_state {
+      case Locking:
+        ext.Requirements[id] = Unlocked
+
+        // Check if all requirements unlocked now
+        unlocked := 0
+        for _, req_state := range(ext.Requirements) {
+          if req_state == Unlocked {
+            unlocked += 1
           }
         }
-    } else {
-      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_locked")})
+
+        if unlocked == len(ext.Requirements) {
+          changes = append(changes, "owner", "state")
+          ext.State = Unlocked
+          ext.Owner = nil
+        }
+      case Unlocking:
+        // Handle error for unlocking requirement while unlocking by retrying unlock
+        unlock_signal := NewUnlockSignal()
+        ext.Waiting[unlock_signal.Id] = id
+        messages = append(messages, Message{id, unlock_signal})
+      }
     }
-  default:
-    ctx.Log.Logf("lockable", "LOCK_ERR: unkown state %s", signal.State)
   }
+
   return messages, changes
 }
 
-func (ext *LockableExt) HandleTimeoutSignal(ctx *Context, node *Node, source NodeID, signal *TimeoutSignal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
+// Handle a success signal by checking if all requirements have been locked/unlocked
+func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source NodeID, signal *SuccessSignal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
+
+  id, waiting := ext.Waiting[signal.ReqID]
+  if waiting == true {
+    delete(ext.Waiting, signal.ReqID)
+    changes = append(changes, "waiting")
 
-  wait_info, found := node.ProcessResponse(ext.WaitInfos, signal)
-  if found == true {
-    changes.Add("wait_infos")
-    state, found := ext.Requirements[wait_info.Destination]
-    if found == true {
-      ctx.Log.Logf("lockable", "%s timed out %s while %s was %s", wait_info.Destination, ReqStateStrings[state], node.ID, ReqStateStrings[state])
     switch ext.State {
-      case AbortingLock:
-        ext.Requirements[wait_info.Destination] = Unlocked
-        all_unlocked := true
-        for _, state := range(ext.Requirements) {
-          if state != Unlocked {
-            all_unlocked = false
-            break
-          }
-        }
-        if all_unlocked == true {
-          changes.Add("state")
-          ext.State = Unlocked
+    case Locking:
+      ext.Requirements[id] = Locked
+      ext.Locked[id] = nil
+      delete(ext.Unlocked, id)
+
+      if len(ext.Locked) == len(ext.Requirements) {
+        ctx.Log.Logf("lockable", "%s FULL_LOCK: %d", node.ID, len(ext.Locked))
+        changes = append(changes, "state", "owner", "req_id")
+        ext.State = Locked
+
+        ext.Owner = ext.PendingOwner
+
+        messages = append(messages, Message{*ext.Owner, NewSuccessSignal(*ext.ReqID)})
+        ext.ReqID = nil
+      } else {
+        ctx.Log.Logf("lockable", "%s PARTIAL_LOCK: %d/%d", node.ID, len(ext.Locked), len(ext.Requirements))
       }
+    case AbortingLock:
+      req_state := ext.Requirements[id]
+      switch req_state {
       case Locking:
-        ext.State = AbortingLock
-        ext.Requirements[wait_info.Destination] = Unlocked
-        for id, state := range(ext.Requirements) {
-          if state == Locked {
         ext.Requirements[id] = Unlocking
-            lock_signal := NewLockSignal("unlock")
-            ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("unlock", id, lock_signal, 100*time.Millisecond)
-            messages = append(messages, SendMsg{id, lock_signal})
-            ctx.Log.Logf("lockable", "sent abort unlock to %s from %s", id, node.ID)
-          }
-        }
+        unlock_signal := NewUnlockSignal()
+        ext.Waiting[unlock_signal.Id] = id
+        messages = append(messages, Message{id, unlock_signal})
       case Unlocking:
-        ext.Requirements[wait_info.Destination] = Locked
-        all_returned := true
-        for _, state := range(ext.Requirements) {
-          if state == Unlocking {
-            all_returned = false
-            break
+        ext.Requirements[id] = Unlocked
+        ext.Unlocked[id] = nil
+        delete(ext.Locked, id)
+
+        unlocked := 0
+        for _, req_state := range(ext.Requirements) {
+          switch req_state {
+          case Unlocked:
+            unlocked += 1
           }
         }
-        if all_returned == true {
-          ext.State = Locked
+
+        if unlocked == len(ext.Requirements) {
+          changes = append(changes, "state", "pending_owner", "req_id")
+
+          messages = append(messages, Message{*ext.PendingOwner, NewErrorSignal(*ext.ReqID, "not_unlocked: %s", ext.State)})
+          ext.State = Unlocked
+          ext.ReqID = nil
+          ext.PendingOwner = nil
         }
       }
-    } else {
-      ctx.Log.Logf("lockable", "%s timed out", wait_info.Destination)
+
+
+    case Unlocking:
+      ext.Requirements[id] = Unlocked
+      ext.Unlocked[id] = Unlocked
+      delete(ext.Locked, id)
+
+      if len(ext.Unlocked) == len(ext.Requirements) {
+        changes = append(changes, "state", "owner", "req_id")
+
+        messages = append(messages, Message{*ext.Owner, NewSuccessSignal(*ext.ReqID)})
+        ext.State = Unlocked
+        ext.ReqID = nil
+        ext.Owner = nil
+      }
     }
   }
 
   return messages, changes
 }
 
-// LockableExts process status signals by forwarding them to it's owner
-// LockSignal and LinkSignal Direct signals are processed to update the requirement/dependency/lock state
-func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
-  var messages []SendMsg = nil
-  var changes = Changes{}
+func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]Message, Changes) {
+  var messages []Message = nil
+  var changes Changes = nil
 
   switch sig := signal.(type) {
   case *StatusSignal:
+    // Forward StatusSignals up to the owner(unless that would be a cycle)
     if ext.Owner != nil {
       if *ext.Owner != node.ID {
-        messages = append(messages, SendMsg{*ext.Owner, signal})
+        messages = append(messages, Message{*ext.Owner, signal})
       }
     }
   case *LinkSignal:
     messages, changes = ext.HandleLinkSignal(ctx, node, source, sig)
   case *LockSignal:
     messages, changes = ext.HandleLockSignal(ctx, node, source, sig)
+  case *UnlockSignal:
+    messages, changes = ext.HandleUnlockSignal(ctx, node, source, sig)
   case *ErrorSignal:
     messages, changes = ext.HandleErrorSignal(ctx, node, source, sig)
   case *SuccessSignal:
     messages, changes = ext.HandleSuccessSignal(ctx, node, source, sig)
-  case *TimeoutSignal:
-    messages, changes = ext.HandleTimeoutSignal(ctx, node, source, sig)
-  default:
   }
 
   return messages, changes

lockable_test.go

@@ -10,16 +10,16 @@ func TestLink(t *testing.T) {
 
 
   l2_listener := NewListenerExt(10)
-  l2, err := NewNode(ctx, nil, "Lockable", 10, l2_listener, NewLockableExt(nil))
+  l2, err := ctx.NewNode(nil, "LockableNode", l2_listener, NewLockableExt(nil))
   fatalErr(t, err)
 
   l1_lockable := NewLockableExt(nil)
   l1_listener := NewListenerExt(10)
-  l1, err := NewNode(ctx, nil, "Lockable", 10, l1_listener, l1_lockable)
+  l1, err := ctx.NewNode(nil, "LockableNode", l1_listener, l1_lockable)
   fatalErr(t, err)
 
   link_signal := NewLinkSignal("add", l2.ID)
-  msgs := []SendMsg{{l1.ID, link_signal}}
+  msgs := []Message{{l1.ID, link_signal}}
   err = ctx.Send(l1, msgs)
   fatalErr(t, err)
 
@@ -34,7 +34,7 @@ func TestLink(t *testing.T) {
   }
 
   unlink_signal := NewLinkSignal("remove", l2.ID)
-  msgs = []SendMsg{{l1.ID, unlink_signal}}
+  msgs = []Message{{l1.ID, unlink_signal}}
   err = ctx.Send(l1, msgs)
   fatalErr(t, err)
 
@@ -42,24 +42,40 @@ func TestLink(t *testing.T) {
   fatalErr(t, err)
 }
 
+func Test10Lock(t *testing.T) {
+  testLockN(t, 10)
+}
+
+func Test100Lock(t *testing.T) {
+  testLockN(t, 100)
+}
+
 func Test1000Lock(t *testing.T) {
+  testLockN(t, 1000)
+}
+
+func Test10000Lock(t *testing.T) {
+  testLockN(t, 10000)
+}
+
+func testLockN(t *testing.T, n int) {
   ctx := logTestContext(t, []string{"test"})
 
   NewLockable := func()(*Node) {
-    l, err := NewNode(ctx, nil, "Lockable", 10, NewLockableExt(nil))
+    l, err := ctx.NewNode(nil, "LockableNode", NewLockableExt(nil))
     fatalErr(t, err)
     return l
   }
 
-  reqs := make([]NodeID, 1000)
+  reqs := make([]NodeID, n)
   for i := range(reqs) {
     new_lockable := NewLockable()
     reqs[i] = new_lockable.ID
   }
-  ctx.Log.Logf("test", "CREATED_1000")
+  ctx.Log.Logf("test", "CREATED_%d", n)
 
-  listener := NewListenerExt(5000)
-  node, err := NewNode(ctx, nil, "Lockable", 5000, listener, NewLockableExt(reqs))
+  listener := NewListenerExt(50000)
+  node, err := ctx.NewNode(nil, "LockableNode", listener, NewLockableExt(reqs))
   fatalErr(t, err)
   ctx.Log.Logf("test", "CREATED_LISTENER")
 
@@ -75,15 +91,15 @@ func Test1000Lock(t *testing.T) {
     t.Fatalf("Unexpected response to lock - %s", resp)
   }
 
-  ctx.Log.Logf("test", "LOCKED_1000")
+  ctx.Log.Logf("test", "LOCKED_%d", n)
 }
 
 func TestLock(t *testing.T) {
   ctx := logTestContext(t, []string{"test", "lockable"})
 
   NewLockable := func(reqs []NodeID)(*Node, *ListenerExt) {
-    listener := NewListenerExt(1000)
-    l, err := NewNode(ctx, nil, "Lockable", 10, listener, NewLockableExt(reqs))
+    listener := NewListenerExt(10000)
+    l, err := ctx.NewNode(nil, "LockableNode", listener, NewLockableExt(reqs))
     fatalErr(t, err)
     return l, listener
   }
@@ -102,25 +118,31 @@ func TestLock(t *testing.T) {
   ctx.Log.Logf("test", "l4: %s", l4.ID)
   ctx.Log.Logf("test", "l5: %s", l5.ID)
 
+  ctx.Log.Logf("test", "locking l0")
   id_1, err := LockLockable(ctx, l0)
-  ctx.Log.Logf("test", "ID_1: %s", id_1)
   fatalErr(t, err)
-  _, _, err = WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_1)
+  response, _, err := WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_1)
   fatalErr(t, err)
+  ctx.Log.Logf("test", "l0 lock: %+v", response)
 
+  ctx.Log.Logf("test", "locking l1")
   id_2, err := LockLockable(ctx, l1)
   fatalErr(t, err)
-  _, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*100, id_2)
+  response, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*10000, id_2)
   fatalErr(t, err)
+  ctx.Log.Logf("test", "l1 lock: %+v", response)
 
+  ctx.Log.Logf("test", "unlocking l0")
   id_3, err := UnlockLockable(ctx, l0)
   fatalErr(t, err)
-  _, _, err = WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_3)
+  response, _, err = WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_3)
   fatalErr(t, err)
+  ctx.Log.Logf("test", "l0 unlock: %+v", response)
 
+  ctx.Log.Logf("test", "locking l1")
   id_4, err := LockLockable(ctx, l1)
   fatalErr(t, err)
-
-  _, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*10, id_4)
+  response, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*10, id_4)
   fatalErr(t, err)
+  ctx.Log.Logf("test", "l1 lock: %+v", response)
 }

log.go

@@ -50,7 +50,7 @@ func (logger * ConsoleLogger) SetComponents(components []string) error {
     return false
   }
 
-  for c, _ := range(logger.loggers) {
+  for c := range(logger.loggers) {
     if component_enabled(c) == false {
       delete(logger.loggers, c)
     }

message.go

@@ -1,11 +1,68 @@
 package graphvent
 
-type SendMsg struct {
-  Dest   NodeID
+type Message struct {
+  Node NodeID
   Signal Signal
 }
 
-type RecvMsg struct {
-  Source NodeID
-  Signal Signal
+type MessageQueue struct {
+  out chan<- Message
+  in <-chan Message
+  buffer []Message
+  write_cursor int
+  read_cursor int
+}
+
+func (queue *MessageQueue) ProcessIncoming(message Message) {
+  if (queue.write_cursor + 1) == queue.read_cursor || ((queue.write_cursor + 1) == len(queue.buffer) && queue.read_cursor == 0) {
+    new_buffer := make([]Message, len(queue.buffer) * 2)
+
+    copy(new_buffer, queue.buffer[queue.read_cursor:])
+    first_chunk := len(queue.buffer) - queue.read_cursor
+    copy(new_buffer[first_chunk:], queue.buffer[0:queue.write_cursor])
+
+    queue.write_cursor = len(queue.buffer) - 1
+    queue.read_cursor = 0
+    queue.buffer = new_buffer
+  }
+
+  queue.buffer[queue.write_cursor] = message
+  queue.write_cursor += 1
+  if queue.write_cursor >= len(queue.buffer) {
+    queue.write_cursor = 0
+  }
+}
+
+func NewMessageQueue(initial int) (chan<- Message, <-chan Message) {
+  in := make(chan Message, 0)
+  out := make(chan Message, 0)
+
+  queue := MessageQueue{
+    out: out,
+    in: in,
+    buffer: make([]Message, initial),
+    write_cursor: 0,
+    read_cursor: 0,
+  }
+
+  go func(queue *MessageQueue) {
+    for true {
+      if queue.write_cursor != queue.read_cursor {
+        select {
+        case incoming := <-queue.in:
+          queue.ProcessIncoming(incoming)
+        case queue.out <- queue.buffer[queue.read_cursor]:
+          queue.read_cursor += 1
+          if queue.read_cursor >= len(queue.buffer) {
+            queue.read_cursor = 0
+          }
+        }
+      } else {
+        message := <-queue.in
+        queue.ProcessIncoming(message)
+      }
+    }
+  }(&queue)
+
+  return in, out
 }

message_test.go

@@ -0,0 +1,35 @@
+package graphvent
+
+import (
+	"encoding/binary"
+	"testing"
+)
+
+func sendBatch(start, end uint64, in chan<- Message) {
+  for i := start; i <= end; i++ {
+    var id NodeID
+    binary.BigEndian.PutUint64(id[:], i)
+    in <- Message{id, nil}
+  }
+}
+
+func TestMessageQueue(t *testing.T) {
+  in, out := NewMessageQueue(10)
+
+  for i := uint64(0); i < 1000; i++ {
+    go sendBatch(1000*i, (1000*(i+1))-1, in)
+  }
+
+  seen := map[NodeID]any{}
+  for i := uint64(0); i < 1000*1000; i++ {
+    read := <-out
+    _, already_seen := seen[read.Node]
+    if already_seen {
+      t.Fatalf("Signal %d had duplicate NodeID %s", i, read.Node)
+    } else {
+      seen[read.Node] = nil
+    }
+  }
+
+  t.Logf("Processed 1M signals through queue")
+}

node.go

@@ -2,9 +2,7 @@ package graphvent
 
 import (
 	"crypto/ed25519"
-  "crypto/rand"
 	"crypto/sha512"
-  "encoding/binary"
 	"fmt"
 	"reflect"
 	"sync/atomic"
@@ -25,6 +23,10 @@ type NodeID uuid.UUID
 func (id NodeID) MarshalBinary() ([]byte, error) {
   return (uuid.UUID)(id).MarshalBinary()
 }
+func (id *NodeID) UnmarshalBinary(data []byte) error {
+  return (*uuid.UUID)(id).UnmarshalBinary(data)
+}
+
 func (id NodeID) String() string {
   return (uuid.UUID)(id).String()
 }
@@ -67,25 +69,27 @@ func (q QueuedSignal) String() string {
   return fmt.Sprintf("%+v@%s", reflect.TypeOf(q.Signal), q.Time)
 }
 
-// Default message channel size for nodes
+type WaitMap map[uuid.UUID]NodeID
+
+const NODE_INITIAL_QUEUE_SIZE = 2
+
 // Nodes represent a group of extensions that can be collectively addressed
 type Node struct {
   Key ed25519.PrivateKey `gv:"key"`
   ID NodeID
   Type NodeType `gv:"type"`
-  // TODO: move each extension to it's own db key, and extend changes to notify which extension was changed
+
   Extensions map[ExtType]Extension
 
   // Channel for this node to receive messages from the Context
-  MsgChan chan RecvMsg
-  // Size of MsgChan
-  BufferSize uint32 `gv:"buffer_size"`
+  SendChan chan<- Message
+  RecvChan <-chan Message
+
   // Channel for this node to process delayed signals
   TimeoutChan <-chan time.Time
 
   Active atomic.Bool
 
-  // TODO: enhance WriteNode to write SignalQueue to a different key, and use writeSignalQueue to decide whether or not to update it
   writeSignalQueue bool
   SignalQueue []QueuedSignal
   NextSignal *QueuedSignal
@@ -97,59 +101,11 @@ func (node *Node) PostDeserialize(ctx *Context) error {
   public := node.Key.Public().(ed25519.PublicKey)
   node.ID = KeyID(public)
 
-  node.MsgChan = make(chan RecvMsg, node.BufferSize)
+  node.SendChan, node.RecvChan = NewMessageQueue(NODE_INITIAL_QUEUE_SIZE)
 
   return nil
 }
 
-type WaitReason string
-type WaitInfo struct {
-  Destination NodeID `gv:"destination" node:"Base"`
-  Timeout uuid.UUID `gv:"timeout"`
-  Reason WaitReason `gv:"reason"`
-}
-
-type WaitMap map[uuid.UUID]WaitInfo
-
-// Removes a signal from the wait_map and dequeue the associated timeout signal
-// Returns the data, and whether or not the ID was found in the wait_map
-func (node *Node) ProcessResponse(wait_map WaitMap, response ResponseSignal) (WaitInfo, bool) {
-  wait_info, is_processed := wait_map[response.ResponseID()]
-  if is_processed == true {
-    delete(wait_map, response.ResponseID())
-    if response.ID() != wait_info.Timeout {
-      node.DequeueSignal(wait_info.Timeout)
-    }
-    return wait_info, true
-  }
-  return WaitInfo{}, false
-}
-
-func (node *Node) NewTimeout(reason WaitReason, dest NodeID, timeout time.Duration) (WaitInfo, uuid.UUID) {
-  id := uuid.New()
-
-  timeout_signal := NewTimeoutSignal(id)
-  node.QueueSignal(time.Now().Add(timeout), timeout_signal)
-
-  return WaitInfo{
-    Destination: dest,
-    Timeout: timeout_signal.Id,
-    Reason: reason,
-  }, id
-}
-
-// Creates a timeout signal for signal, queues it for the node at the timeout, and returns the WaitInfo
-func (node *Node) QueueTimeout(reason WaitReason, dest NodeID, signal Signal, timeout time.Duration) WaitInfo {
-  timeout_signal := NewTimeoutSignal(signal.ID())
-  node.QueueSignal(time.Now().Add(timeout), timeout_signal)
-
-  return WaitInfo{
-    Destination: dest,
-    Timeout: timeout_signal.Id,
-    Reason: reason,
-  }
-}
-
 func (node *Node) QueueSignal(time time.Time, signal Signal) {
   node.SignalQueue = append(node.SignalQueue, QueuedSignal{signal, time})
   node.NextSignal, node.TimeoutChan = SoonestSignal(node.SignalQueue)
@@ -187,18 +143,23 @@ func SoonestSignal(signals []QueuedSignal) (*QueuedSignal, <-chan time.Time) {
   }
 
   if soonest_signal != nil {
+    if time.Now().Compare(soonest_time) == -1 {
       return soonest_signal, time.After(time.Until(soonest_signal.Time))
+    } else {
+      c := make(chan time.Time, 1)
+      c <- soonest_time
+      return soonest_signal, c
+    }
   } else {
     return nil, nil
   }
 }
 
-func runNode(ctx *Context, node *Node) {
+func runNode(ctx *Context, node *Node, status chan string, control chan string) {
   ctx.Log.Logf("node", "RUN_START: %s", node.ID)
-  err := nodeLoop(ctx, node)
+  err := nodeLoop(ctx, node, status, control)
   if err != nil {
     ctx.Log.Logf("node", "%s runNode err %s", node.ID, err)
-    panic(err)
   }
   ctx.Log.Logf("node", "RUN_STOP: %s", node.ID)
 }
@@ -214,43 +175,74 @@ func (err StringError) MarshalBinary() ([]byte, error) {
   return []byte(string(err)), nil
 }
 
-func (node *Node) ReadFields(ctx *Context, reqs map[ExtType][]string)map[ExtType]map[string]any {
-  ctx.Log.Logf("read_field", "Reading %+v on %+v", reqs, node.ID)
-  exts := map[ExtType]map[string]any{}
-  for ext_type, field_reqs := range(reqs) {
-    ext_info, ext_known := ctx.Extensions[ext_type]
-    if ext_known { 
-      fields := map[string]any{}
-      for _, req := range(field_reqs) {
-        ext, exists := node.Extensions[ext_type]
-        if exists == false {
-          fields[req] = fmt.Errorf("%+v does not have %+v extension", node.ID, ext_type)
+func (node *Node) ReadFields(ctx *Context, fields []string)map[string]any {
+  ctx.Log.Logf("read_field", "Reading %+v on %+v", fields, node.ID)
+  values := map[string]any{}
+
+  node_info := ctx.NodeTypes[node.Type]
+
+  for _, field_name := range(fields) {
+    field_info, mapped := node_info.Fields[field_name]
+    if mapped {
+      ext := node.Extensions[field_info.Extension]
+      values[field_name] = reflect.ValueOf(ext).Elem().FieldByIndex(field_info.Index).Interface()
     } else {
-          fields[req] = reflect.ValueOf(ext).Elem().FieldByIndex(ext_info.Fields[req].Index).Interface()
-        }
-      }
-      exts[ext_type] = fields
+      values[field_name] = fmt.Errorf("NodeType %s has no field %s", node.Type, field_name)
     }
   }
-  return exts
+
+  return values
 }
 
 // Main Loop for nodes
-func nodeLoop(ctx *Context, node *Node) error {
-  started := node.Active.CompareAndSwap(false, true)
-  if started == false {
+func nodeLoop(ctx *Context, node *Node, status chan string, control chan string) error {
+  is_started := node.Active.CompareAndSwap(false, true)
+  if is_started == false {
     return fmt.Errorf("%s is already started, will not start again", node.ID)
+  } else {
+    ctx.Log.Logf("node", "Set %s active", node.ID)
   }
 
-  run := true
-  for run == true {
+  ctx.Log.Logf("node_ext", "Loading extensions for %s", node.ID)
+
+  for _, extension := range(node.Extensions) {
+    ctx.Log.Logf("node_ext", "Loading extension %s for %s", reflect.TypeOf(extension), node.ID)
+    err := extension.Load(ctx, node)
+    if err != nil {
+      ctx.Log.Logf("node_ext", "Failed to load extension %s on node %s", reflect.TypeOf(extension), node.ID)
+      node.Active.Store(false)
+      return err
+    } else {
+      ctx.Log.Logf("node_ext", "Loaded extension %s on node %s", reflect.TypeOf(extension), node.ID)
+    }
+  }
+
+  ctx.Log.Logf("node_ext", "Loaded extensions for %s", node.ID)
+
+  status <- "active"
+
+  running := true
+  for running {
     var signal Signal
     var source NodeID
-    select {
-    case msg := <- node.MsgChan:
-      signal = msg.Signal
-      source = msg.Source
 
+    select {
+    case command := <-control:
+      switch command {
+      case "stop":
+        running = false
+      case "pause":
+        status <- "paused"
+        command := <- control
+        switch command {
+        case "resume":
+          status <- "resumed"
+        case "stop":
+          running = false
+        }
+      default:
+        ctx.Log.Logf("node", "Unknown control command %s", command)
+      }
     case <-node.TimeoutChan:
       signal = node.NextSignal.Signal
       source = node.ID
@@ -279,15 +271,17 @@ func nodeLoop(ctx *Context, node *Node) error {
       } else {
         ctx.Log.Logf("node", "NODE_TIMEOUT(%s) - PROCESSING %+v@%s - NEXT_SIGNAL: %s@%s", node.ID, signal, t, node.NextSignal, node.NextSignal.Time)
       }
-    }
+    case msg := <- node.RecvChan:
+      signal = msg.Signal
+      source = msg.Node
 
-    ctx.Log.Logf("node", "NODE_SIGNAL_QUEUE[%s]: %+v", node.ID, node.SignalQueue)
+    }
 
     switch sig := signal.(type) {
     case *ReadSignal:
-      result := node.ReadFields(ctx, sig.Extensions)
-      msgs := []SendMsg{}
-      msgs = append(msgs, SendMsg{source, NewReadResultSignal(sig.ID(), node.ID, node.Type, result)})
+      result := node.ReadFields(ctx, sig.Fields)
+      msgs := []Message{}
+      msgs = append(msgs, Message{source, NewReadResultSignal(sig.ID(), node.ID, node.Type, result)})
       ctx.Send(node, msgs)
 
     default:
@@ -303,31 +297,45 @@ func nodeLoop(ctx *Context, node *Node) error {
   if stopped == false {
     panic("BAD_STATE: stopping already stopped node")
   }
-  return nil
-}
 
-func (node *Node) Unload(ctx *Context) error {
-  if node.Active.Load() {
   for _, extension := range(node.Extensions) {
     extension.Unload(ctx, node)
   }
+
+  status <- "stopped"
+
   return nil
-  } else {
-    return fmt.Errorf("Node not active")
-  }
 }
 
 func (node *Node) QueueChanges(ctx *Context, changes map[ExtType]Changes) error {
-  node.QueueSignal(time.Now(), NewStatusSignal(node.ID, changes))
+  node_info, exists := ctx.NodeTypes[node.Type]
+  if exists == false {
+    return fmt.Errorf("Node type not in context, can't map changes to field names")
+  } else {
+    fields := []string{}
+    for ext_type, ext_changes := range(changes) {
+      ext_map, ext_mapped := node_info.ReverseFields[ext_type]
+      if ext_mapped {
+        for _, ext_tag := range(ext_changes) {
+          field_name, tag_mapped := ext_map[ext_tag]
+          if tag_mapped {
+            fields = append(fields, field_name)
+          }
+        }
+      }
+    }
+    ctx.Log.Logf("changes", "Changes to queue from %+v: %+v", node_info.ReverseFields, fields)
+    if len(fields) > 0 {
+      node.QueueSignal(time.Time{}, NewStatusSignal(node.ID, fields))
+    }
     return nil
   }
+}
 
 func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
-  ctx.Log.Logf("node_process", "PROCESSING MESSAGE: %s - %+v", node.ID, signal)
-  messages := []SendMsg{}
+  messages := []Message{}
   changes := map[ExtType]Changes{}
   for ext_type, ext := range(node.Extensions) {
-    ctx.Log.Logf("node_process", "PROCESSING_EXTENSION: %s/%s", node.ID, ext_type)
     ext_messages, ext_changes := ext.Process(ctx, node, source, signal)
     if len(ext_messages) != 0 {
       messages = append(messages, ext_messages...)
@@ -336,7 +344,6 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
       changes[ext_type] = ext_changes
     }
   }
-  ctx.Log.Logf("changes", "Changes for %s after %+v - %+v", node.ID, reflect.TypeOf(signal), changes)
 
   if len(messages) != 0 {
     send_err := ctx.Send(node, messages)
@@ -346,11 +353,7 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
   }
 
   if len(changes) != 0 {
-    write_err := WriteNodeChanges(ctx, node, changes)
-    if write_err != nil {
-      return write_err
-    }
-
+    ctx.Log.Logf("changes", "Changes to %s from %+v: %+v", node.ID, signal, changes)
     status_err := node.QueueChanges(ctx, changes)
     if status_err != nil {
       return status_err
@@ -396,85 +399,3 @@ func KeyID(pub ed25519.PublicKey) NodeID {
   id := uuid.NewHash(sha512.New(), ZeroUUID, pub, 3)
   return NodeID(id)
 }
-
-// Create a new node in memory and start it's event loop
-func NewNode(ctx *Context, key ed25519.PrivateKey, type_name string, buffer_size uint32, extensions ...Extension) (*Node, error) {
-  node_type, known_type := ctx.NodeTypes[type_name]
-  if known_type == false {
-    return nil, fmt.Errorf("%s is not a known node type", type_name)
-  }
-
-  var err error
-  var public ed25519.PublicKey
-  if key == nil {
-    public, key, err = ed25519.GenerateKey(rand.Reader)
-    if err != nil {
-      return nil, err
-    }
-  } else {
-    public = key.Public().(ed25519.PublicKey)
-  }
-  id := KeyID(public)
-  _, exists := ctx.Node(id)
-  if exists == true {
-    return nil, fmt.Errorf("Attempted to create an existing node")
-  }
-
-  ext_map := map[ExtType]Extension{}
-  for _, ext := range(extensions) {
-    ext_type, exists := ctx.ExtensionTypes[reflect.TypeOf(ext).Elem()]
-    if exists == false {
-      return nil, fmt.Errorf(fmt.Sprintf("%+v is not a known Extension", reflect.TypeOf(ext)))
-    }
-    _, exists = ext_map[ext_type.ExtType]
-    if exists == true {
-      return nil, fmt.Errorf("Cannot add the same extension to a node twice")
-    }
-    ext_map[ext_type.ExtType] = ext
-  }
-
-  for _, required_ext := range(node_type.Extensions) {
-    _, exists := ext_map[required_ext]
-    if exists == false {
-      return nil, fmt.Errorf(fmt.Sprintf("%+v requires %+v", node_type, required_ext))
-    }
-  }
-
-  node := &Node{
-    Key: key,
-    ID: id,
-    Type: node_type.NodeType,
-    Extensions: ext_map,
-    MsgChan: make(chan RecvMsg, buffer_size),
-    BufferSize: buffer_size,
-    SignalQueue: []QueuedSignal{},
-    writeSignalQueue: false,
-  }
-
-  err = WriteNodeInit(ctx, node)
-  if err != nil {
-    return nil, err
-  }
-
-  // Load each extension before starting the main loop
-  for _, extension := range(node.Extensions) {
-    err := extension.Load(ctx, node)
-    if err != nil {
-      return nil, err
-    }
-  }
-
-  ctx.AddNode(id, node)
-  go runNode(ctx, node)
-
-  return node, nil
-}
-
-var extension_suffix = []byte{0xEE, 0xFF, 0xEE, 0xFF}
-var signal_queue_suffix = []byte{0xAB, 0xBA, 0xAB, 0xBA}
-func ExtTypeSuffix(ext_type ExtType) []byte {
-  ret := make([]byte, 12)
-  copy(ret[0:4], extension_suffix)
-  binary.BigEndian.PutUint64(ret[4:], uint64(ext_type))
-  return ret
-}

node_test.go

@@ -5,29 +5,19 @@ import (
   "time"
   "crypto/rand"
   "crypto/ed25519"
-  "slices"
 )
 
 func TestNodeDB(t *testing.T) {
-  ctx := logTestContext(t, []string{"node", "db"})
+  ctx := logTestContext(t, []string{"test", "node", "db"})
 
   node_listener := NewListenerExt(10)
-  node, err := NewNode(ctx, nil, "Base", 10, NewLockableExt(nil), node_listener)
+  node, err := ctx.NewNode(nil, "Node", NewLockableExt(nil), node_listener)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(node_listener.Chan, 10*time.Millisecond, func(sig *StatusSignal) bool {
-    gql_changes, has_gql := sig.Changes[ExtTypeFor[GQLExt]()]
-    if has_gql == true {
-      return slices.Contains(gql_changes, "state") && sig.Source == node.ID
-    }
-    return false
-  })
-
-  err = ctx.Unload(node.ID)
+  err = ctx.Stop()
   fatalErr(t, err)
 
-  ctx.nodeMap = map[NodeID]*Node{}
-  _, err = ctx.getNode(node.ID)
+  _, err = ctx.GetNode(node.ID)
   fatalErr(t, err)
 }
 
@@ -46,16 +36,14 @@ func TestNodeRead(t *testing.T) {
   ctx.Log.Logf("test", "N2: %s", n2_id)
 
   n2_listener := NewListenerExt(10)
-  n2, err := NewNode(ctx, n2_key, "Base", 10, n2_listener)
+  n2, err := ctx.NewNode(n2_key, "Node", n2_listener)
   fatalErr(t, err)
 
-  n1, err := NewNode(ctx, n1_key, "Base", 10, NewListenerExt(10)) 
+  n1, err := ctx.NewNode(n1_key, "Node", NewListenerExt(10)) 
   fatalErr(t, err)
 
-  read_sig := NewReadSignal(map[ExtType][]string{
-    ExtTypeFor[ListenerExt](): {"buffer"},
-  })
-  msgs := []SendMsg{{n1.ID, read_sig}}
+  read_sig := NewReadSignal([]string{"buffer"})
+  msgs := []Message{{n1.ID, read_sig}}
   err = ctx.Send(n2, msgs)
   fatalErr(t, err)
 

serialize.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"reflect"
   "math"
-	"slices"
 )
 
 type SerializedType uint64
@@ -39,14 +38,8 @@ func (t FieldTag) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
 
-func NodeTypeFor(extensions []ExtType) NodeType {
-  digest := []byte("GRAPHVENT_NODE - ")
-
-  slices.Sort(extensions)
-
-  for _, ext := range(extensions) {
-    digest = binary.BigEndian.AppendUint64(digest, uint64(ext))
-  }
+func NodeTypeFor(name string) NodeType {
+  digest := []byte("GRAPHVENT_NODE - " + name)
 
   hash := sha512.Sum512(digest)
   return NodeType(binary.BigEndian.Uint64(hash[0:8]))
@@ -66,6 +59,10 @@ func ExtTypeFor[E any, T interface { *E; Extension}]() ExtType {
   return ExtType(SerializedTypeFor[E]())
 }
 
+func ExtTypeOf(t reflect.Type) ExtType {
+  return ExtType(SerializeType(t.Elem()))
+}
+
 func SignalTypeFor[S Signal]() SignalType {
   return SignalType(SerializedTypeFor[S]())
 }
@@ -80,49 +77,59 @@ func GetFieldTag(tag string) FieldTag {
   return FieldTag(Hash("GRAPHVENT_FIELD_TAG", tag))
 }
 
-func TypeStack(ctx *Context, t reflect.Type) ([]byte, error) {
-  info, registered := ctx.TypeTypes[t]
+func TypeStack(ctx *Context, t reflect.Type, data []byte) (int, error) {
+  info, registered := ctx.Types[t]
   if registered {
-    return binary.BigEndian.AppendUint64(nil, uint64(info.Serialized)), nil
+    binary.BigEndian.PutUint64(data, uint64(info.Serialized))
+    return 8, nil
   } else {
     switch t.Kind() {
     case reflect.Map:
-      key_stack, err := TypeStack(ctx, t.Key())
+      binary.BigEndian.PutUint64(data, uint64(SerializeType(reflect.Map)))
+
+      key_written, err := TypeStack(ctx, t.Key(), data[8:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      elem_stack, err := TypeStack(ctx, t.Elem())
+      elem_written, err := TypeStack(ctx, t.Elem(), data[8 + key_written:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      return append(binary.BigEndian.AppendUint64(nil, uint64(SerializeType(reflect.Map))), append(key_stack, elem_stack...)...), nil
+      return 8 + key_written + elem_written, nil
+
     case reflect.Pointer:
-      elem_stack, err := TypeStack(ctx, t.Elem())
+      binary.BigEndian.PutUint64(data, uint64(SerializeType(reflect.Pointer)))
+
+      elem_written, err := TypeStack(ctx, t.Elem(), data[8:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      return append(binary.BigEndian.AppendUint64(nil, uint64(SerializeType(reflect.Pointer))), elem_stack...), nil
+      return 8 + elem_written, nil
     case reflect.Slice:
-      elem_stack, err := TypeStack(ctx, t.Elem())
+      binary.BigEndian.PutUint64(data, uint64(SerializeType(reflect.Slice)))
+
+      elem_written, err := TypeStack(ctx, t.Elem(), data[8:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      return append(binary.BigEndian.AppendUint64(nil, uint64(SerializeType(reflect.Slice))), elem_stack...), nil
+      return 8 + elem_written, nil
     case reflect.Array:
-      elem_stack, err := TypeStack(ctx, t.Elem())
+      binary.BigEndian.PutUint64(data, uint64(SerializeType(reflect.Array)))
+      binary.BigEndian.PutUint64(data[8:], uint64(t.Len()))
+
+      elem_written, err := TypeStack(ctx, t.Elem(), data[16:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      stack := binary.BigEndian.AppendUint64(nil, uint64(SerializeType(reflect.Array)))
-      stack = binary.BigEndian.AppendUint64(stack, uint64(t.Len()))
-      return append(stack, elem_stack...), nil
+      return 16 + elem_written, nil
+
     default:
-      return nil, fmt.Errorf("Hit %s, which is not a registered type", t.String())
+      return 0, fmt.Errorf("Hit %s, which is not a registered type", t.String())
     }
   }
 }
@@ -131,7 +138,7 @@ func UnwrapStack(ctx *Context, stack []byte) (reflect.Type, []byte, error) {
   first_bytes, left := split(stack, 8)
   first := SerializedType(binary.BigEndian.Uint64(first_bytes))
 
-  info, registered := ctx.TypeMap[first]
+  info, registered := ctx.TypesReverse[first]
   if registered {
     return info.Reflect, left, nil
   } else {
@@ -176,18 +183,18 @@ func UnwrapStack(ctx *Context, stack []byte) (reflect.Type, []byte, error) {
   }
 }
 
-func Serialize[T any](ctx *Context, value T) ([]byte, error) {
-  return serializeValue(ctx, reflect.ValueOf(&value).Elem())
+func Serialize[T any](ctx *Context, value T, data []byte) (int, error) {
+  return SerializeValue(ctx, reflect.ValueOf(&value).Elem(), data)
 }
 
 func Deserialize[T any](ctx *Context, data []byte) (T, error) {
   reflect_type := reflect.TypeFor[T]()
   var zero T
-  value, left, err := deserializeValue(ctx, data, reflect_type)
+  value, left, err := DeserializeValue(ctx, data, reflect_type)
   if err != nil {
     return zero, err
   } else if len(left) != 0 {
-    return zero, fmt.Errorf("%d bytes left after deserializing %+v", len(left), value)
+    return zero, fmt.Errorf("%d/%d bytes left after deserializing %+v", len(left), len(data), value)
   } else if value.Type() != reflect_type {
     return zero, fmt.Errorf("Deserialized type %s does not match %s", value.Type(), reflect_type)
   }
@@ -195,10 +202,156 @@ func Deserialize[T any](ctx *Context, data []byte) (T, error) {
   return value.Interface().(T), nil
 }
 
-func serializeValue(ctx *Context, value reflect.Value) ([]byte, error) {
+func SerializedSize(ctx *Context, value reflect.Value) (int, error) {
+  var sizefn SerializedSizeFn = nil
+
+  info, registered := ctx.Types[value.Type()]
+  if registered {
+    sizefn = info.SerializedSize
+  }
+
+  if sizefn == nil {
+    switch value.Type().Kind() {
+    case reflect.Bool:
+      return 1, nil 
+
+    case reflect.Int8:
+      return 1, nil
+    case reflect.Int16:
+      return 2, nil
+    case reflect.Int32:
+      return 4, nil
+    case reflect.Int64:
+      fallthrough
+    case reflect.Int:
+      return 8, nil
+  
+    case reflect.Uint8:
+      return 1, nil
+    case reflect.Uint16:
+      return 2, nil
+    case reflect.Uint32:
+      return 4, nil
+    case reflect.Uint64:
+      fallthrough
+    case reflect.Uint:
+      return 8, nil
+
+    case reflect.Float32:
+      return 4, nil 
+    case reflect.Float64:
+      return 8, nil
+
+    case reflect.String:
+      return 8 + value.Len(), nil
+
+    case reflect.Pointer:
+      if value.IsNil() {
+        return 1, nil
+      } else {
+        elem_len, err := SerializedSize(ctx, value.Elem())
+        if err != nil {
+          return 0, err
+        } else {
+          return 1 + elem_len, nil
+        }
+      }
+
+    case reflect.Slice:
+      if value.IsNil() {
+        return 1, nil
+      } else {
+        elem_total := 0
+        for i := 0; i < value.Len(); i++ {
+          elem_len, err := SerializedSize(ctx, value.Index(i))
+          if err != nil {
+            return 0, err
+          }
+          elem_total += elem_len
+        }
+        return 9 + elem_total, nil 
+      }
+
+    case reflect.Array:
+      total := 0
+      for i := 0; i < value.Len(); i++ {
+        elem_len, err := SerializedSize(ctx, value.Index(i))
+        if err != nil {
+          return 0, err
+        }
+        total += elem_len
+      }
+      return total, nil
+
+    case reflect.Map:
+      if value.IsNil() {
+        return 1, nil
+      } else {
+        key := reflect.New(value.Type().Key()).Elem()
+        val := reflect.New(value.Type().Elem()).Elem()
+        iter := value.MapRange()
+
+        total := 0
+        for iter.Next() {
+          key.SetIterKey(iter)
+          k, err := SerializedSize(ctx, key)
+          if err != nil {
+            return 0, err
+          }
+
+          total += k
+
+          val.SetIterValue(iter)
+          v, err := SerializedSize(ctx, val)
+          if err != nil {
+            return 0, err
+          }
+
+          total += v
+        }
+
+        return 9 + total, nil
+      }
+
+    case reflect.Struct:
+      if registered == false {
+        return 0, fmt.Errorf("Can't serialize unregistered struct %s", value.Type())
+      } else {
+        field_total := 0
+        for _, field_info := range(info.Fields) {
+          field_size, err := SerializedSize(ctx, value.FieldByIndex(field_info.Index))
+          if err != nil {
+            return 0, err
+          }
+
+          field_total += 8
+          field_total += field_size
+        }
+
+        return 8 + field_total, nil
+      }
+
+    case reflect.Interface:
+      // TODO get size of TypeStack instead of just using 128
+      elem_size, err := SerializedSize(ctx, value.Elem())
+      if err != nil {
+        return 0, err
+      }
+
+      return 128 + elem_size, nil
+
+    default:
+      return 0, fmt.Errorf("Don't know how to serialize %s", value.Type())
+    }
+  } else {
+    return sizefn(ctx, value)
+  }
+}
+
+func SerializeValue(ctx *Context, value reflect.Value, data []byte) (int, error) {
   var serialize SerializeFn = nil
 
-  info, registered := ctx.TypeTypes[value.Type()]
+  info, registered := ctx.Types[value.Type()]
   if registered {
     serialize = info.Serialize 
   }
@@ -207,144 +360,160 @@ func serializeValue(ctx *Context, value reflect.Value) ([]byte, error) {
     switch value.Type().Kind() {
     case reflect.Bool:
       if value.Bool() {
-        return []byte{0xFF}, nil
+        data[0] = 0xFF
       } else {
-        return []byte{0x00}, nil
+        data[0] = 0x00
       }
+      return 1, nil
 
     case reflect.Int8:
-      return []byte{byte(value.Int())}, nil
+      data[0] = byte(value.Int())
+      return 1, nil
     case reflect.Int16:
-      return binary.BigEndian.AppendUint16(nil, uint16(value.Int())), nil
+      binary.BigEndian.PutUint16(data, uint16(value.Int()))
+      return 2, nil
     case reflect.Int32:
-      return binary.BigEndian.AppendUint32(nil, uint32(value.Int())), nil
+      binary.BigEndian.PutUint32(data, uint32(value.Int()))
+      return 4, nil
     case reflect.Int64:
       fallthrough
     case reflect.Int:
-      return binary.BigEndian.AppendUint64(nil, uint64(value.Int())), nil
+      binary.BigEndian.PutUint64(data, uint64(value.Int()))
+      return 8, nil
 
     case reflect.Uint8:
-      return []byte{byte(value.Uint())}, nil
+      data[0] = byte(value.Uint())
+      return 1, nil
     case reflect.Uint16:
-      return binary.BigEndian.AppendUint16(nil, uint16(value.Uint())), nil
+      binary.BigEndian.PutUint16(data, uint16(value.Uint()))
+      return 2, nil
     case reflect.Uint32:
-      return binary.BigEndian.AppendUint32(nil, uint32(value.Uint())), nil
+      binary.BigEndian.PutUint32(data, uint32(value.Uint()))
+      return 4, nil
     case reflect.Uint64:
       fallthrough
     case reflect.Uint:
-      return binary.BigEndian.AppendUint64(nil, value.Uint()), nil
+      binary.BigEndian.PutUint64(data, value.Uint())
+      return 8, nil
 
     case reflect.Float32:
-      return binary.BigEndian.AppendUint32(nil, math.Float32bits(float32(value.Float()))), nil
+      binary.BigEndian.PutUint32(data, math.Float32bits(float32(value.Float())))
+      return 4, nil
     case reflect.Float64:
-      return binary.BigEndian.AppendUint64(nil, math.Float64bits(value.Float())), nil
+      binary.BigEndian.PutUint64(data, math.Float64bits(value.Float()))
+      return 8, nil
 
     case reflect.String:
-      len_bytes := make([]byte, 8)
-      binary.BigEndian.PutUint64(len_bytes, uint64(value.Len()))
-      return append(len_bytes, []byte(value.String())...), nil
+      binary.BigEndian.PutUint64(data, uint64(value.Len()))
+      copy(data[8:], []byte(value.String()))
+      return 8 + value.Len(), nil
 
     case reflect.Pointer:
       if value.IsNil() {
-        return []byte{0x00}, nil
+        data[0] = 0x00
+        return 1, nil
       } else {
-        elem, err := serializeValue(ctx, value.Elem())
+        data[0] = 0x01
+        written, err := SerializeValue(ctx, value.Elem(), data[1:])
         if err != nil {
-          return nil, err
+          return 0, err
         }
-
-        return append([]byte{0x01}, elem...), nil
+        return 1 + written, nil
       }
 
     case reflect.Slice:
       if value.IsNil() {
-        return []byte{0x00}, nil
+        data[0] = 0x00
+        return 8, nil
       } else {
-        len_bytes := make([]byte, 8)
-        binary.BigEndian.PutUint64(len_bytes, uint64(value.Len()))
-
-        data := []byte{}
+        data[0] = 0x01
+        binary.BigEndian.PutUint64(data[1:], uint64(value.Len()))
+        total_written := 0
         for i := 0; i < value.Len(); i++ {
-          elem, err := serializeValue(ctx, value.Index(i))
+          written, err := SerializeValue(ctx, value.Index(i), data[9+total_written:])
           if err != nil {
-            return nil, err
+            return 0, err
           }
-
-          data = append(data, elem...)
+          total_written += written
         }
-
-        return append(len_bytes, data...), nil
+        return 9 + total_written, nil
       }
 
     case reflect.Array:
-      data := []byte{}
+      total_written := 0
       for i := 0; i < value.Len(); i++ {
-        elem, err := serializeValue(ctx, value.Index(i))
+        written, err := SerializeValue(ctx, value.Index(i), data[total_written:])
         if err != nil {
-          return nil, err
+          return 0, err
         }
-
-        data = append(data, elem...)
+        total_written += written
       }
-      return data, nil
+      return total_written, nil
 
     case reflect.Map:
-      len_bytes := make([]byte, 8)
-      binary.BigEndian.PutUint64(len_bytes, uint64(value.Len()))
+      if value.IsNil() {
+        data[0] = 0x00
+        return 1, nil
+      } else {
+        data[0] = 0x01
+        binary.BigEndian.PutUint64(data[1:], uint64(value.Len()))
 
-      data := []byte{}
+        key := reflect.New(value.Type().Key()).Elem()
+        val := reflect.New(value.Type().Elem()).Elem()
         iter := value.MapRange()
+        total_written := 0
         for iter.Next() {
-        k, err := serializeValue(ctx, iter.Key())
+          key.SetIterKey(iter)
+          val.SetIterValue(iter)
+
+          k, err := SerializeValue(ctx, key, data[9+total_written:])
           if err != nil {
-          return nil, err
+            return 0, err
           }
+          total_written += k
 
-        data = append(data, k...)
-
-        v, err := serializeValue(ctx, iter.Value())
+          v, err := SerializeValue(ctx, val, data[9+total_written:]) 
           if err != nil {
-          return nil, err
+            return 0, err
           }
-
-        data = append(data, v...)
+          total_written += v
+        }
+        return 9 + total_written, nil
       }
-      return append(len_bytes, data...), nil
     
     case reflect.Struct:
       if registered == false {
-        return nil, fmt.Errorf("Cannot serialize unregistered struct %s", value.Type())
+        return 0, fmt.Errorf("Cannot serialize unregistered struct %s", value.Type())
       } else {
-        data := binary.BigEndian.AppendUint64(nil, uint64(len(info.Fields)))
+        binary.BigEndian.PutUint64(data, uint64(len(info.Fields)))
 
+        total_written := 0
         for field_tag, field_info := range(info.Fields) {
-          data = append(data, binary.BigEndian.AppendUint64(nil, uint64(field_tag))...)
-          field_bytes, err := serializeValue(ctx, value.FieldByIndex(field_info.Index))
+          binary.BigEndian.PutUint64(data[8+total_written:], uint64(field_tag))
+          total_written += 8
+          written, err := SerializeValue(ctx, value.FieldByIndex(field_info.Index), data[8+total_written:])
           if err != nil {
-            return nil, err
+            return 0, err
           }
-
-          data = append(data, field_bytes...)
+          total_written += written
         }
-        return data, nil
+        return 8 + total_written, nil
       }
 
     case reflect.Interface:
-      data, err := TypeStack(ctx, value.Elem().Type())
+      type_written, err := TypeStack(ctx, value.Elem().Type(), data)
 
-      val_data, err := serializeValue(ctx, value.Elem())
+      elem_written, err := SerializeValue(ctx, value.Elem(), data[type_written:])
       if err != nil {
-        return nil, err
+        return 0, err
       }
 
-      data = append(data, val_data...)
-
-      return data, nil
+      return type_written + elem_written, nil
     default:
-      return nil, fmt.Errorf("Don't know how to serialize %s", value.Type())
+      return 0, fmt.Errorf("Don't know how to serialize %s", value.Type())
     }
   } else {
-    return serialize(ctx, value)
+    return serialize(ctx, value, data)
   }
 }
 
@@ -352,10 +521,10 @@ func split(data []byte, n int) ([]byte, []byte) {
   return data[:n], data[n:]
 }
 
-func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value, []byte, error) {
+func DeserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value, []byte, error) {
   var deserialize DeserializeFn = nil
 
-  info, registered := ctx.TypeTypes[t]
+  info, registered := ctx.Types[t]
   if registered {
     deserialize = info.Deserialize
   }
@@ -439,7 +608,7 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
         value.SetZero()
         return value, after_flags, nil
       } else {
-        elem_value, after_elem, err := deserializeValue(ctx, after_flags, t.Elem())
+        elem_value, after_elem, err := DeserializeValue(ctx, after_flags, t.Elem())
         if err != nil {
           return reflect.Value{}, nil, err
         }
@@ -448,19 +617,25 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
       }
 
     case reflect.Slice:
+      nil_byte := data[0]
+      data = data[1:]
+      if nil_byte == 0x00 {
+        return reflect.New(t).Elem(), data, nil
+      } else {
         len_bytes, left := split(data, 8)
         length := int(binary.BigEndian.Uint64(len_bytes))
         value := reflect.MakeSlice(t, length, length)
         for i := 0; i < length; i++ {
           var elem_value reflect.Value
           var err error
-        elem_value, left, err = deserializeValue(ctx, left, t.Elem())
+          elem_value, left, err = DeserializeValue(ctx, left, t.Elem())
           if err != nil {
             return reflect.Value{}, nil, err
           }
           value.Index(i).Set(elem_value)
         }
         return value, left, nil
+      }
 
     case reflect.Array:
       value := reflect.New(t).Elem()
@@ -468,7 +643,7 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
       for i := 0; i < t.Len(); i++ {
         var elem_value reflect.Value
         var err error
-        elem_value, left, err = deserializeValue(ctx, left, t.Elem())
+        elem_value, left, err = DeserializeValue(ctx, left, t.Elem())
         if err != nil {
           return reflect.Value{}, nil, err
         }
@@ -477,7 +652,11 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
       return value, left, nil
 
     case reflect.Map:
-      len_bytes, left := split(data, 8)
+      flags, after_flags := split(data, 1)
+      if flags[0] == 0x00 {
+        return reflect.New(t).Elem(), after_flags, nil
+      } else {
+        len_bytes, left := split(after_flags, 8)
         length := int(binary.BigEndian.Uint64(len_bytes))
 
         value := reflect.MakeMapWithSize(t, length)
@@ -487,12 +666,12 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
           var val_value reflect.Value
           var err error
 
-        key_value, left, err = deserializeValue(ctx, left, t.Key())        
+          key_value, left, err = DeserializeValue(ctx, left, t.Key())        
           if err != nil {
             return reflect.Value{}, nil, err
           }
 
-        val_value, left, err = deserializeValue(ctx, left, t.Elem())
+          val_value, left, err = DeserializeValue(ctx, left, t.Elem())
           if err != nil {
             return reflect.Value{}, nil, err
           }
@@ -501,9 +680,10 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
         }
 
         return value, left, nil
+      }
 
     case reflect.Struct:
-      info, mapped := ctx.TypeTypes[t]
+      info, mapped := ctx.Types[t]
       if mapped {
         value := reflect.New(t).Elem()
 
@@ -520,7 +700,7 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
           if mapped {
             var field_val reflect.Value
             var err error
-            field_val, left, err = deserializeValue(ctx, left, field_info.Type)
+            field_val, left, err = DeserializeValue(ctx, left, field_info.Type)
             if err != nil {
               return reflect.Value{}, nil, err
             }
@@ -544,7 +724,7 @@ func deserializeValue(ctx *Context, data []byte, t reflect.Type) (reflect.Value,
         return reflect.Value{}, nil, err
       }
 
-      elem_val, left, err := deserializeValue(ctx, rest, elem_type)
+      elem_val, left, err := DeserializeValue(ctx, rest, elem_type)
       if err != nil {
         return reflect.Value{}, nil, err
       }

serialize_test.go

@@ -7,10 +7,13 @@ import (
 )
 
 func testTypeStack[T any](t *testing.T, ctx *Context) {
+  buffer := [1024]byte{}
   reflect_type := reflect.TypeFor[T]()
-  stack, err := TypeStack(ctx, reflect_type)
+  written, err := TypeStack(ctx, reflect_type, buffer[:])
   fatalErr(t, err)
 
+  stack := buffer[:written]
+
   ctx.Log.Logf("test", "TypeStack[%s]: %+v", reflect_type, stack)
 
   unwrapped_type, rest, err := UnwrapStack(ctx, stack)
@@ -41,9 +44,12 @@ func TestSerializeTypes(t *testing.T) {
 }
 
 func testSerializeCompare[T comparable](t *testing.T, ctx *Context, value T) {
-  serialized, err := Serialize(ctx, value) 
+  buffer := [1024]byte{}
+  written, err := Serialize(ctx, value, buffer[:]) 
   fatalErr(t, err)
 
+  serialized := buffer[:written]
+
   ctx.Log.Logf("test", "Serialized Value[%s : %+v]: %+v", reflect.TypeFor[T](), value, serialized)
 
   deserialized, err := Deserialize[T](ctx, serialized)
@@ -57,9 +63,12 @@ func testSerializeCompare[T comparable](t *testing.T, ctx *Context, value T) {
 }
 
 func testSerializeList[L []T, T comparable](t *testing.T, ctx *Context, value L) {
-  serialized, err := Serialize(ctx, value)
+  buffer := [1024]byte{}
+  written, err := Serialize(ctx, value, buffer[:])
   fatalErr(t, err)
 
+  serialized := buffer[:written]
+
   ctx.Log.Logf("test", "Serialized Value[%s : %+v]: %+v", reflect.TypeFor[L](), value, serialized)
 
   deserialized, err := Deserialize[L](ctx, serialized)
@@ -75,9 +84,13 @@ func testSerializeList[L []T, T comparable](t *testing.T, ctx *Context, value L)
 }
 
 func testSerializePointer[P interface {*T}, T comparable](t *testing.T, ctx *Context, value P) {
-  serialized, err := Serialize(ctx, value)
+  buffer := [1024]byte{}
+
+  written, err := Serialize(ctx, value, buffer[:])
   fatalErr(t, err)
 
+  serialized := buffer[:written]
+
   ctx.Log.Logf("test", "Serialized Value[%s : %+v]: %+v", reflect.TypeFor[P](), value, serialized)
 
   deserialized, err := Deserialize[P](ctx, serialized)
@@ -97,9 +110,12 @@ func testSerializePointer[P interface {*T}, T comparable](t *testing.T, ctx *Con
 }
 
 func testSerialize[T any](t *testing.T, ctx *Context, value T) {
-  serialized, err := Serialize(ctx, value)
+  buffer := [1024]byte{}
+  written, err := Serialize(ctx, value, buffer[:])
   fatalErr(t, err)
 
+  serialized := buffer[:written]
+
   ctx.Log.Logf("test", "Serialized Value[%s : %+v]: %+v", reflect.TypeFor[T](), value, serialized)
 
   deserialized, err := Deserialize[T](ctx, serialized)
@@ -144,7 +160,17 @@ func TestSerializeValues(t *testing.T) {
   testSerializeCompare[*int](t, ctx, nil)
   testSerializeCompare(t, ctx, "string")
 
-  node, err := NewNode(ctx, nil, "Base", 100)
+  testSerialize(t, ctx, map[string]string{
+    "Test": "Test",
+    "key": "String",
+    "": "",
+  })
+
+  testSerialize[map[string]string](t, ctx, nil)
+
+  testSerialize(t, ctx, NewListenerExt(10))
+
+  node, err := ctx.NewNode(nil, "Node")
   fatalErr(t, err)
   testSerialize(t, ctx, node)
 }

signal.go

@@ -21,13 +21,6 @@ func (signal TimeoutSignal) String() string {
   return fmt.Sprintf("TimeoutSignal(%s)", &signal.ResponseHeader)
 }
 
-type SignalDirection int
-const (
-  Up SignalDirection = iota
-  Down
-  Direct
-)
-
 type SignalHeader struct {
   Id uuid.UUID `gv:"id"`
 }
@@ -37,7 +30,7 @@ func (signal SignalHeader) ID() uuid.UUID {
 }
 
 func (header SignalHeader) String() string {
-   return fmt.Sprintf("SignalHeader(%s)", header.Id)
+   return fmt.Sprintf("%s", header.Id)
 }
 
 type ResponseSignal interface {
@@ -55,7 +48,7 @@ func (header ResponseHeader) ResponseID() uuid.UUID {
 }
 
 func (header ResponseHeader) String() string {
-   return fmt.Sprintf("ResponseHeader(%s, %s)", header.Id, header.ReqID)
+   return fmt.Sprintf("%s for %s", header.Id, header.ReqID)
 }
 
 type Signal interface {
@@ -171,16 +164,16 @@ func NewACLTimeoutSignal(req_id uuid.UUID) *ACLTimeoutSignal {
 type StatusSignal struct {
   SignalHeader
   Source NodeID `gv:"source"`
-  Changes map[ExtType]Changes `gv:"changes"`
+  Fields []string `gv:"fields"`
 }
 func (signal StatusSignal) String() string {
-  return fmt.Sprintf("StatusSignal(%s, %+v)", signal.SignalHeader, signal.Changes)
+  return fmt.Sprintf("StatusSignal(%s: %+v)", signal.Source, signal.Fields)
 }
-func NewStatusSignal(source NodeID, changes map[ExtType]Changes) *StatusSignal {
+func NewStatusSignal(source NodeID, fields []string) *StatusSignal {
   return &StatusSignal{
     NewSignalHeader(),
     source,
-    changes,
+    fields,
   }
 }
 
@@ -205,32 +198,44 @@ func NewLinkSignal(action string, id NodeID) Signal {
 
 type LockSignal struct {
   SignalHeader
-  State string
 }
 func (signal LockSignal) String() string {
-  return fmt.Sprintf("LockSignal(%s, %s)", signal.SignalHeader, signal.State)
+  return fmt.Sprintf("LockSignal(%s)", signal.SignalHeader)
 }
 
-func NewLockSignal(state string) *LockSignal {
+func NewLockSignal() *LockSignal {
   return &LockSignal{
     NewSignalHeader(),
-    state,
   }
 }
 
+type UnlockSignal struct {
+  SignalHeader
+}
+func (signal UnlockSignal) String() string {
+  return fmt.Sprintf("UnlockSignal(%s)", signal.SignalHeader)
+}
+
+func NewUnlockSignal() *UnlockSignal {
+  return &UnlockSignal{
+    NewSignalHeader(),
+  }
+}
+
+
 type ReadSignal struct {
   SignalHeader
-  Extensions map[ExtType][]string `json:"extensions"`
+  Fields []string `json:"extensions"`
 }
 
 func (signal ReadSignal) String() string {
-  return fmt.Sprintf("ReadSignal(%s, %+v)", signal.SignalHeader, signal.Extensions)
+  return fmt.Sprintf("ReadSignal(%s, %+v)", signal.SignalHeader, signal.Fields)
 }
 
-func NewReadSignal(exts map[ExtType][]string) *ReadSignal {
+func NewReadSignal(fields []string) *ReadSignal {
   return &ReadSignal{
     NewSignalHeader(),
-    exts,
+    fields,
   }
 }
 
@@ -238,19 +243,19 @@ type ReadResultSignal struct {
   ResponseHeader
   NodeID NodeID
   NodeType NodeType
-  Extensions map[ExtType]map[string]any
+  Fields map[string]any
 }
 
 func (signal ReadResultSignal) String() string {
-  return fmt.Sprintf("ReadResultSignal(%s, %s, %+v)", signal.ResponseHeader, signal.NodeID, signal.Extensions)
+  return fmt.Sprintf("ReadResultSignal(%s, %s, %+v)", signal.ResponseHeader, signal.NodeID, signal.Fields)
 }
 
-func NewReadResultSignal(req_id uuid.UUID, node_id NodeID, node_type NodeType, exts map[ExtType]map[string]any) *ReadResultSignal {
+func NewReadResultSignal(req_id uuid.UUID, node_id NodeID, node_type NodeType, fields map[string]any) *ReadResultSignal {
   return &ReadResultSignal{
     NewResponseHeader(req_id),
     node_id,
     node_type,
-    exts,
+    fields,
   }
 }