cmd/graphiql/main.go

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

@@ -3,226 +3,153 @@ package graphvent
 import (
 	"encoding/binary"
 	"fmt"
-	"reflect"
-  "sync"
 
 	badger "github.com/dgraph-io/badger/v3"
 )
 
-type Database interface {
+func WriteNodeInit(ctx *Context, node *Node) error {
-  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 db.Update(func(tx *badger.Txn) error {
+  return ctx.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
-    written, err := Serialize(ctx, node, db.buffer[cur:])
+    node_val, err := Serialize(ctx, node)
     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")...)
-    written, err = Serialize(ctx, node.SignalQueue, db.buffer[cur:])
+    sigqueue_val, err := Serialize(ctx, node.SignalQueue)
     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)
     }
-    written, err = Serialize(ctx, ext_list, db.buffer[cur:])
+    ext_list_val, err := Serialize(ctx, ext_list)
     if err != nil {
       return err
     }
     ext_list_id := append(id_ser, []byte(" - EXTLIST")...)
-    err = tx.Set(ext_list_id, db.buffer[cur:cur+written])
+    err = tx.Set(ext_list_id, ext_list_val)
     if err != nil {
       return err
     }
-    cur += written
 
     // For each extension:
     for ext_type, ext := range(node.Extensions) {
-      ext_info, exists := ctx.Extensions[ext_type]
+      // Write each extension's current value
-      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 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)
+        return err
-        }
-        cur += written
       }
+      err = tx.Set(ext_id, ext_val)
     }
     return nil
   })
 }
 
-func (db *BadgerDB) WriteNodeChanges(ctx *Context, node *Node, changes map[ExtType]Changes) error {
+func WriteNodeChanges(ctx *Context, node *Node, changes map[ExtType]Changes) error {
-  return db.Update(func(tx *badger.Txn) error {
+  return ctx.DB.Update(func(tx *badger.Txn) error {
-    db.Lock()
-    defer db.Unlock()
-
     // Get the base key bytes
-    id_bytes := ([16]byte)(node.ID)
+    id_ser, err := node.ID.MarshalBinary()
-
+    if err != nil {
-    cur := 0
+      return err
+    }
 
     // Write the signal queue if it needs to be written
     if node.writeSignalQueue {
       node.writeSignalQueue = false
 
-      sigqueue_id := append(id_bytes[:], []byte(" - SIGQUEUE")...)
+      sigqueue_id := append(id_ser, []byte(" - SIGQUEUE")...)
-      written, err := Serialize(ctx, node.SignalQueue, db.buffer[cur:])
+      sigqueue_val, err := Serialize(ctx, node.SignalQueue)
       if err != nil {
-        return fmt.Errorf("SignalQueue Serialize Error: %+v, %w", node.SignalQueue, err)
+        return err
       }
-      err = tx.Set(sigqueue_id, db.buffer[cur:cur+written])
+      err = tx.Set(sigqueue_id, sigqueue_val)
       if err != nil {
-        return fmt.Errorf("SignalQueue set error: %+v, %w", node.SignalQueue, err)
+        return err
       }
-      cur += written
     }
 
     // For each ext in changes
-    for ext_type, changes := range(changes) {
+    for ext_type := range(changes) {
-      ext_info, exists := ctx.Extensions[ext_type]
+      // Write each ext
-      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_bytes[:], uint64(ext_type))
+      ext_id := binary.BigEndian.AppendUint64(id_ser, uint64(ext_type))
-      ext_value := reflect.ValueOf(ext)
+      ext_ser, err := Serialize(ctx, 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 fmt.Errorf("Extension serialize err: %s, %w", reflect.TypeOf(ext), err)
+        return err
       }
 
-        err = tx.Set(field_id, db.buffer[cur:cur+written])
+      err = tx.Set(ext_id, ext_ser)
       if err != nil {
-          return fmt.Errorf("Extension set err: %s, %w", reflect.TypeOf(ext), err)
+        return err
-        }
-        cur += written
       }
     }
     return nil
   })
 }
 
-func (db *BadgerDB) LoadNode(ctx *Context, id NodeID) (*Node, error) {
+func 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 fmt.Errorf("Failed to serialize node_id: %w", err)
+      return err
     }
 
     // Get the node value
     node_item, err := tx.Get(id_ser)
     if err != nil {
-      return fmt.Errorf("Failed to get node_item: %w", NodeNotFoundError)
+      return err
     }
 
     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 fmt.Errorf("Failed to deserialize Node %s - %w", id, err)
+      return nil
     }
 
     // Get the signal queue
     sigqueue_id := append(id_ser, []byte(" - SIGQUEUE")...)
     sigqueue_item, err := tx.Get(sigqueue_id)
     if err != nil {
-      return fmt.Errorf("Failed to get sigqueue_id: %w", err)
+      return err
     }
     err = sigqueue_item.Value(func(val []byte) error {
       node.SignalQueue, err = Deserialize[[]QueuedSignal](ctx, val)
       return err
     })
     if err != nil {
-      return fmt.Errorf("Failed to deserialize []QueuedSignal for %s: %w", id, err)
+      return err
     }
 
     // Get the extension list
@@ -241,34 +168,20 @@ func (db *BadgerDB) 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_info, exists := ctx.Extensions[ext_type]
+      ext_item, err := tx.Get(ext_id)
-      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
       }
 
-          ext.Elem().FieldByIndex(field_info.Index).Set(value)
+      var ext Extension
-
+      err = ext_item.Value(func(val []byte) error {
-          return nil
+        ext, err = Deserialize[Extension](ctx, val)
+        return err
       })
       if err != nil {
         return err
       }
-      }
+      node.Extensions[ext_type] = ext
-
-      node.Extensions[ext_type] = ext.Interface().(Extension)
     }
 
     return nil
@@ -276,8 +189,6 @@ func (db *BadgerDB) 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

@@ -0,0 +1,156 @@
+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

@@ -0,0 +1,86 @@
+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

@@ -1,12 +1,13 @@
 package graphvent
 
-type Tag string
+import (
-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) ([]Message, Changes)
+  Process(*Context, *Node, NodeID, Signal) ([]SendMsg, Changes)
 
   // Called when the node is loaded into a context(creation or move), so extension data can be initialized
   Load(*Context, *Node) error
@@ -14,3 +15,10 @@ 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

@@ -249,14 +249,13 @@ 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()
@@ -305,6 +304,7 @@ 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),
@@ -330,6 +330,18 @@ 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)
@@ -339,12 +351,11 @@ 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()
@@ -418,14 +429,11 @@ func GQLWSHandler(ctx * Context, server *Node, gql_ext *GQLExt) func(http.Respon
             params.VariableValues = msg.Payload.Variables
           }
 
-          var res_chan chan *graphql.Result
+          res_chan := GQLWSDo(ctx, params)
-          operation := getOperationTypeOfReq(params)
+          if res_chan == nil {
-
+            ctx.Log.Logf("gqlws", "res_chan is nil")
-          if operation == ast.OperationTypeSubscription {
-            res_chan = graphql.Subscribe(params)
           } else {
-            res := graphql.Do(params)
+            ctx.Log.Logf("gqlws", "res_chan: %+v", res_chan)
-            res_chan = sendOneResultAndClose(res)
           }
 
           go func(res_chan chan *graphql.Result) {
@@ -501,7 +509,7 @@ type Field struct {
 type NodeResult struct {
   NodeID NodeID
   NodeType NodeType
-  Data map[string]interface{}
+  Data map[ExtType]map[string]interface{}
 }
 
 type ListField struct {
@@ -518,7 +526,6 @@ type SelfField struct {
 
 type SubscriptionInfo struct {
   ID uuid.UUID
-  NodeCache *map[NodeID]NodeResult
   Channel chan interface{}
 }
 
@@ -537,13 +544,11 @@ type GQLExt struct {
   State string `gv:"state"`
   TLSKey []byte `gv:"tls_key"`
   TLSCert []byte `gv:"tls_cert"`
-  Listen string `gv:"listen" gql:"GQLListen"`
+  Listen string `gv:"listen"`
 }
 
 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)
 }
 
@@ -557,7 +562,14 @@ func (ext *GQLExt) Unload(ctx *Context, node *Node) {
   }
 }
 
-func (ext *GQLExt) AddSubscription(id uuid.UUID, ctx *ResolveContext) (chan interface{}, error) {
+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) {
   ext.subscriptions_lock.Lock()
   defer ext.subscriptions_lock.Unlock()
 
@@ -571,7 +583,6 @@ func (ext *GQLExt) AddSubscription(id uuid.UUID, ctx *ResolveContext) (chan inte
 
   ext.subscriptions = append(ext.subscriptions, SubscriptionInfo{
     id,
-    &ctx.NodeCache,
     c,
   })
 
@@ -619,10 +630,10 @@ 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) ([]Message, Changes) {
+func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
   // Process ReadResultSignalType by forwarding it to the waiting resolver
   var changes Changes = nil
-  var messages []Message = nil
+  var messages []SendMsg = nil
 
   switch sig := signal.(type) {
   case *SuccessSignal:
@@ -634,6 +645,8 @@ 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:
@@ -646,6 +659,9 @@ 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:
@@ -653,22 +669,23 @@ 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()
-    for _, sub := range(ext.subscriptions) {
+    ctx.Log.Logf("gql", "forwarding status signal from %+v to resolvers %+v", sig.Source, ext.subscriptions)
-      _, cached := (*sub.NodeCache)[sig.Source]
+    for _, resolver := range(ext.subscriptions) {
-      if cached {
       select {
-        case sub.Channel <- sig:
+      case resolver.Channel <- sig:
-          ctx.Log.Logf("gql", "forwarded status signal %+v to subscription: %s", sig, sub.ID)
+        ctx.Log.Logf("gql_subscribe", "forwarded status signal to resolver: %+v", resolver.ID)
       default:
-          ctx.Log.Logf("gql", "subscription channel overflow: %s", sub.ID)
+        ctx.Log.Logf("gql_subscribe", "resolver channel overflow: %+v", resolver.ID)
-        }
       }
     }
     ext.subscriptions_lock.RUnlock()

gql_node.go

@@ -25,12 +25,7 @@ func ResolveNodeType(p graphql.ResolveParams) (interface{}, error) {
   return uint64(node.NodeType), nil
 }
 
-type FieldIndex struct {
+func GetFieldNames(ctx *Context, selection_set *ast.SelectionSet) []string {
-  Extension ExtType
-  Tag string
-}
-
-func GetFields(selection_set *ast.SelectionSet) []string {
   names := []string{}
   if selection_set == nil {
     return names
@@ -39,12 +34,10 @@ func GetFields(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:
-      names = append(names, GetFields(field.SelectionSet)...)
+    default:
+      ctx.Log.Logf("gql", "Unknown selection type: %s", reflect.TypeOf(field))
     }
   }
 
@@ -52,65 +45,68 @@ func GetFields(selection_set *ast.SelectionSet) []string {
 }
 
 // Returns the fields that need to be resolved
-func GetResolveFields(p graphql.ResolveParams) []string {
+func GetResolveFields(id NodeID, ctx *ResolveContext, p graphql.ResolveParams) (map[ExtType][]string, error) {
-  fields := []string{}
+  node_info, mapped := ctx.Context.NodeTypes[p.Info.ReturnType.Name()]
-  for _, field := range(p.Info.FieldASTs) {
+  if mapped == false {
-    fields = append(fields, GetFields(field.SelectionSet)...)
+    return nil, fmt.Errorf("No NodeType %s", p.Info.ReturnType.Name())
   }
 
-  return fields
+  fields := map[ExtType][]string{}
-}
+  names := []string{}
-
+  for _, field := range(p.Info.FieldASTs) {
-func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
+    names = append(names, GetFieldNames(ctx.Context, field.SelectionSet)...)
-  ctx, err := PrepResolve(p)
-  if err != nil {
-    return NodeResult{}, err
   }
 
-  switch source := p.Source.(type) {
+  cache, node_cached := ctx.NodeCache[id]
-  case *StatusSignal:
+  for _, name := range(names) {
-    cached_node, cached := ctx.NodeCache[source.Source]
+    if name == "ID" || name == "Type" {
-    if cached {
+      continue
-      for _, field_name := range(source.Fields) {
-        _, cached := cached_node.Data[field_name]
-        if cached {
-          delete(cached_node.Data, field_name)
-        }
     }
-      ctx.NodeCache[source.Source] = cached_node
+
+    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)
     }
+
+    ext_fields, exists := fields[ext_type]
+    if exists == false {
+      ext_fields = []string{}
     }
 
-  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]
+      ext_cache, ext_cached := cache.Data[ext_type]
+      if ext_cached {
+        _, field_cached := ext_cache[name]
         if field_cached {
           continue
         }
       }
+    }
 
-      not_cached = append(not_cached, field)
+    fields[ext_type] = append(ext_fields, name)
   }
-  } else {
+  
-    not_cached = fields
+  return fields, nil
+}
+
+func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
+  ctx, err := PrepResolve(p)
+  if err != nil {
+    return NodeResult{}, err
   }
 
-  if (len(not_cached) == 0) && (node_cached == true) {
+  fields, err := GetResolveFields(id, ctx, p)
-    ctx.Context.Log.Logf("gql", "No new fields to resolve for %s", id)
+  if err != nil {
-    return cache, nil
+    return NodeResult{}, err
-  } else {
+  }
-    ctx.Context.Log.Logf("gql", "Resolving fields %+v on node %s", not_cached, id)
   
-    signal := NewReadSignal(not_cached)
+  ctx.Context.Log.Logf("gql", "Resolving fields %+v on node %s", fields, id)
+
+  signal := NewReadSignal(fields)
   response_chan := ctx.Ext.GetResponseChannel(signal.ID())
   // TODO: TIMEOUT DURATION
-    err = ctx.Context.Send(ctx.Server, []Message{{
+  err = ctx.Context.Send(ctx.Server, []SendMsg{{
-      Node: id,
+    Dest: id,
     Signal: signal,
   }})
   if err != nil {
@@ -126,15 +122,25 @@ 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.Fields,
+        Data: response.Extensions,
       }
     } else {
-        for field_name, field_value := range(response.Fields) {
+      for ext_type, ext_data := range(response.Extensions) {
-          cache.Data[field_name] = field_value
+        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
       }
     }
 
@@ -143,5 +149,4 @@ func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
   default:
     return NodeResult{}, fmt.Errorf("Bad read response: %+v", response)
   }
-  }
 }

gql_test.go

@@ -1,49 +1,162 @@
 package graphvent
 
-import (
+/*import (
-	"bytes"
+  "testing"
-	"crypto/tls"
+  "time"
-	"encoding/json"
   "fmt"
+  "encoding/json"
   "io"
-	"net"
   "net/http"
-	"reflect"
+  "net"
-	"testing"
+  "crypto/tls"
-	"time"
+  "crypto/rand"
-
+  "crypto/ed25519"
-	"github.com/google/uuid"
+  "bytes"
   "golang.org/x/net/websocket"
+  "github.com/google/uuid"
 )
 
-func TestGQLSubscribe(t *testing.T) {
+func TestGQLAuth(t *testing.T) {
-  ctx := logTestContext(t, []string{"test", "gql"})
+  ctx := logTestContext(t, []string{"test"})
 
-  n1, err := ctx.NewNode(nil, "LockableNode", NewLockableExt(nil))
+  listener_1 := NewListenerExt(10)
+  node_1, err := NewNode(ctx, nil, "Base", 10, nil, listener_1)
   fatalErr(t, err)
   
-  listener_ext := NewListenerExt(10)
+  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 TestGQLServer(t *testing.T) {
+  ctx := logTestContext(t, []string{"test", "gqlws", "gql"})
+
+  pub, gql_key, err := ed25519.GenerateKey(rand.Reader)
+  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,
+      },
+    },
+  })
 
   gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
   fatalErr(t, err)
 
-  gql, err := ctx.NewNode(nil, "LockableNode", NewLockableExt([]NodeID{n1.ID}), gql_ext, listener_ext)
+  listener_ext := NewListenerExt(10)
+  n1, err := NewNode(ctx, nil, "Base", 10, []Policy{user_policy_2, user_policy_1}, NewLockableExt(nil))
   fatalErr(t, err)
 
-  query := "subscription { Self { ID, Type ... on Lockable { LockableState } } }"
+  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)
 
   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)
 
-  sub_1 := GQLPayload{
+  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
-    Query: query,
+    return sig.Source == gql_id
-  }
+  })
+  fatalErr(t, err)
 
+  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)
   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)
@@ -61,9 +174,11 @@ func TestGQLSubscribe(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)
@@ -96,128 +211,75 @@ func TestGQLSubscribe(t *testing.T) {
 
     n, err = ws.Read(resp)
     fatalErr(t, err)
-    ctx.Log.Logf("test", "SUB1: %s", resp[:n])
+    ctx.Log.Logf("test", "SUB: %s", resp[:n])
-
-    lock_id, err := LockLockable(ctx, gql)
-    fatalErr(t, err)
 
-    response, _, err := WaitForResponse(listener_ext.Chan, 100*time.Millisecond, lock_id)
+    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)
     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", "SUB2: %s", resp[:n])
-
     n, err = ws.Read(resp)
     fatalErr(t, err)
-    ctx.Log.Logf("test", "SUB3: %s", resp[:n])
+    ctx.Log.Logf("test", "SUB: %s", resp[:n])
 
     // TODO: check that there are no more messages sent to ws within a timeout
   }
 
   SubGQL(sub_1)
-}
-
-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)
 
-  gql_listener := NewListenerExt(10)
+  msgs := Messages{}
-  gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
+  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 {
-  gql, err := ctx.NewNode(nil, "LockableNode", NewLockableExt([]NodeID{n1.ID}), gql_ext, gql_listener)
+    return sig.Source == gql_id
+  })
   fatalErr(t, err)
+}
 
-  ctx.Log.Logf("test", "GQL:  %s", gql.ID)
+func TestGQLDB(t *testing.T) {
-  ctx.Log.Logf("test", "NODE: %s", n1.ID)
+  ctx := logTestContext(t, []string{"test", "db", "node"})
-
-  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)
-
-  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(),
-    },
-  }
-
-  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)
-
-    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)
+  u1, err := NewNode(ctx, nil, "Base", 10, nil)
   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", "U1_ID: %s", u1.ID)
-  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, err := ctx.NewNode(nil, "Node", gql_ext, listener_ext)
+                 gql_ext,
+                 listener_ext,
+                 NewGroupExt(nil))
   fatalErr(t, err)
   ctx.Log.Logf("test", "GQL_ID: %s", gql.ID)
 
-  err = ctx.Stop()
+  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
+  })
   fatalErr(t, err)
 
-  gql_loaded, err := ctx.GetNode(gql.ID)
+  // 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)
   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

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

listener.go

@@ -10,35 +10,12 @@ 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
@@ -50,7 +27,7 @@ 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) ([]Message, Changes) {
+func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, 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 {
@@ -60,7 +37,7 @@ 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.Fields)
+    ctx.Log.Logf("listener_status", "%s - %+v", sig.Source, sig.Changes)
   }
   return nil, nil
 }

lockable.go

@@ -2,6 +2,7 @@ package graphvent
 
 import (
   "github.com/google/uuid"
+  "time"
 )
 
 type ReqState byte
@@ -21,389 +22,399 @@ 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"`
+  Owner *NodeID `gv:"owner" node:"Base"`
-  PendingOwner *NodeID `gv:"pending_owner"`
+  PendingOwner *NodeID `gv:"pending_owner" node:"Base"`
+  PendingID uuid.UUID `gv:"pending_id"`
   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
-  var unlocked map[NodeID]any = map[NodeID]any{}
+  if requirements != nil {
-
-  if len(requirements) != 0 {
     reqs = map[NodeID]ReqState{}
-    for _, req := range(requirements) {
+    for _, id := range(requirements) {
-      reqs[req] = Unlocked
+      reqs[id] = Unlocked
-      unlocked[req] = nil
     }
   }
-
   return &LockableExt{
     State: Unlocked,
     Owner: nil,
     PendingOwner: nil,
     Requirements: reqs,
-    Waiting: WaitMap{},
+    WaitInfos: WaitMap{},
-
-    Locked: map[NodeID]any{},
-    Unlocked: unlocked,
   }
 }
 
 func UnlockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
-  signal := NewUnlockSignal()
+  signal := NewLockSignal("unlock")
-  messages := []Message{{node.ID, signal}}
+  messages := []SendMsg{{node.ID, signal}}
   return signal.ID(), ctx.Send(node, messages)
 }
 
 func LockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
-  signal := NewLockSignal()
+  signal := NewLockSignal("lock")
-  messages := []Message{{node.ID, signal}}
+  messages := []SendMsg{{node.ID, signal}}
   return signal.ID(), ctx.Send(node, messages)
 }
 
 func (ext *LockableExt) Load(ctx *Context, node *Node) error {
-  ext.Locked = map[NodeID]any{}
-  ext.Unlocked = map[NodeID]any{}
-
-  for id, state := range(ext.Requirements) {
-    if state == Unlocked {
-      ext.Unlocked[id] = nil
-    } else if state == Locked {
-      ext.Locked[id] = nil
-    }
-  }
   return nil
 }
 
 func (ext *LockableExt) Unload(ctx *Context, node *Node) {
-  return
 }
 
-// Handle link signal by adding/removing the requested NodeID
+func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) ([]SendMsg, Changes) {
-// returns an error if the node is not unlocked
+  var messages []SendMsg = nil
-func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID, signal *LinkSignal) ([]Message, Changes) {
-  var messages []Message = 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 Unlocked:
+      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)
+            }
+          }
+        }
+
+      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)
+    }
+  }
+
+  return messages, changes
+}
+
+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 signal.Action {
     case "add":
       _, exists := ext.Requirements[signal.NodeID]
       if exists == true {
-        messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "already_requirement")})
+        messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "already_requirement")})
       } else {
         if ext.Requirements == nil {
           ext.Requirements = map[NodeID]ReqState{}
         }
         ext.Requirements[signal.NodeID] = Unlocked
-        changes = append(changes, "requirements")
+        changes.Add("requirements")
-        messages = append(messages, Message{source, NewSuccessSignal(signal.ID())})
+        messages = append(messages, SendMsg{source, NewSuccessSignal(signal.ID())})
       }
     case "remove":
       _, exists := ext.Requirements[signal.NodeID]
       if exists == false {
-        messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "not_requirement")})
+        messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "can't link: not_requirement")})
       } else {
         delete(ext.Requirements, signal.NodeID)
-        changes = append(changes, "requirements")
+        changes.Add("requirements")
-        messages = append(messages, Message{source, NewSuccessSignal(signal.ID())})
+        messages = append(messages, SendMsg{source, NewSuccessSignal(signal.ID())})
       }
     default:
-      messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "unknown_action")})
+      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "unknown_action")})
     }
-  default:
+  } else {
-    messages = append(messages, Message{source, NewErrorSignal(signal.ID(), "not_unlocked: %s", ext.State)})
+    messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_unlocked")})
   }
-
   return messages, changes
 }
 
-// Handle an UnlockSignal by either transitioning to Unlocked state,
+func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source NodeID, signal *SuccessSignal) ([]SendMsg, Changes) {
-// sending unlock signals to requirements, or returning an error signal
+  var messages []SendMsg = nil
-func (ext *LockableExt) HandleUnlockSignal(ctx *Context, node *Node, source NodeID, signal *UnlockSignal) ([]Message, Changes) {
+  var changes = Changes{}
-  var messages []Message = nil
+  if source == node.ID {
-  var changes Changes = nil
+    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:
         switch ext.State {
-  case Locked:
+        case Locking:
-    if source != *ext.Owner {
+          ext.Requirements[info.Destination] = Locked
-      messages = append(messages, Message{source, NewErrorSignal(signal.Id, "not_owner")})
+          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)})
           } else {
-      if len(ext.Requirements) == 0 {
+            changes.Add("requirements")
-        changes = append(changes, "state", "owner", "pending_owner")
+            ctx.Log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, len(ext.Requirements))
+          }
+        case AbortingLock:
+          ext.Requirements[info.Destination] = Unlocking
 
-        ext.Owner = nil
+          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})
 
-        ext.PendingOwner = nil
+          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.State = Unlocked
+        unlocked := 0
+        for _, s := range(ext.Requirements) {
+          if s == Unlocked {
+            unlocked += 1
+          }
+        }
 
-        messages = append(messages, Message{source, NewSuccessSignal(signal.Id)})
+        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
+          }
         } else {
-        changes = append(changes, "state", "waiting", "requirements", "pending_owner")
+          changes.Add("state")
-
+          ctx.Log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, len(ext.Requirements))
-        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 by either transitioning to a locked state,
+// Handle a LockSignal and update the extensions owner/requirement states
-// sending lock signals to requirements, or returning an error signal
+func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) ([]SendMsg, Changes) {
-func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) ([]Message, Changes) {
+  var messages []SendMsg = nil
-  var messages []Message = nil
+  var changes = Changes{}
-  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
-      messages = append(messages, Message{source, NewSuccessSignal(signal.Id)})
+        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())})
       } else {
-      changes = append(changes, "state", "requirements", "waiting", "pending_owner")
-
-      ext.PendingOwner = &source
-
-      ext.ReqID = &signal.Id
-
         ext.State = Locking
-      for id := range(ext.Requirements) {
+        id := signal.ID()
-        lock_signal := NewLockSignal()
+        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")
+          }
 
-        ext.Waiting[lock_signal.Id] = id
+          lock_signal := NewLockSignal("lock")
+          ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("lock", id, lock_signal, 500*time.Millisecond)
           ext.Requirements[id] = Locking
 
-        messages = append(messages, Message{id, lock_signal})
+          messages = append(messages, SendMsg{id, lock_signal})
         }
       }
     default:
-    messages = append(messages, Message{source, NewErrorSignal(signal.Id, "not_unlocked: %s", ext.State)})
+      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_unlocked")})
-  }
+      ctx.Log.Logf("lockable", "Tried to lock %s while %s", node.ID, ext.State)
-
-  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
     }
-      }
+  case "unlock":
-
+    if ext.State == Locked {
-      if unlocked == len(ext.Requirements) {
+      if len(ext.Requirements) == 0 {
-        changes = append(changes, "owner", "state")
         ext.State = Unlocked
+        new_owner := source
+        ext.PendingOwner = nil
         ext.Owner = nil
-      } else {
+        changes.Add("state", "pending_owner", "owner")
-        changes = append(changes, "state")
+        messages = append(messages, SendMsg{new_owner, NewSuccessSignal(signal.ID())})
-        ext.State = AbortingLock
+      } 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")
           }
 
-    case Unlocking:
+          lock_signal := NewLockSignal("unlock")
-      unlock_signal := NewUnlockSignal()
+          ext.WaitInfos[lock_signal.Id] = node.QueueTimeout("unlock", id, lock_signal, 100*time.Millisecond)
-      ext.Waiting[unlock_signal.Id] = id
+          ext.Requirements[id] = Unlocking
-      messages = append(messages, Message{id, unlock_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
+          messages = append(messages, SendMsg{id, lock_signal})
-        unlocked := 0
-        for _, req_state := range(ext.Requirements) {
-          if req_state == Unlocked {
-            unlocked += 1
         }
       }
-
+    } else {
-        if unlocked == len(ext.Requirements) {
+      messages = append(messages, SendMsg{source, NewErrorSignal(signal.ID(), "not_locked")})
-          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
 }
 
-// Handle a success signal by checking if all requirements have been locked/unlocked
+func (ext *LockableExt) HandleTimeoutSignal(ctx *Context, node *Node, source NodeID, signal *TimeoutSignal) ([]SendMsg, Changes) {
-func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source NodeID, signal *SuccessSignal) ([]Message, Changes) {
+  var messages []SendMsg = nil
-  var messages []Message = nil
+  var changes = Changes{}
-  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 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]
+        ext.Requirements[wait_info.Destination] = Unlocked
-      switch req_state {
+        all_unlocked := true
-      case Locking:
+        for _, state := range(ext.Requirements) {
-        ext.Requirements[id] = Unlocking
+          if state != Unlocked {
-        unlock_signal := NewUnlockSignal()
+            all_unlocked = false
-        ext.Waiting[unlock_signal.Id] = id
+            break
-        messages = append(messages, Message{id, unlock_signal})
-      case Unlocking:
-        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_unlocked == true {
-        if unlocked == len(ext.Requirements) {
+          changes.Add("state")
-          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
+      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)
           }
         }
-
-
       case Unlocking:
-      ext.Requirements[id] = Unlocked
+        ext.Requirements[wait_info.Destination] = Locked
-      ext.Unlocked[id] = Unlocked
+        all_returned := true
-      delete(ext.Locked, id)
+        for _, state := range(ext.Requirements) {
-
+          if state == Unlocking {
-      if len(ext.Unlocked) == len(ext.Requirements) {
+            all_returned = false
-        changes = append(changes, "state", "owner", "req_id")
+            break
-
+          }
-        messages = append(messages, Message{*ext.Owner, NewSuccessSignal(*ext.ReqID)})
-        ext.State = Unlocked
-        ext.ReqID = nil
-        ext.Owner = nil
         }
+        if all_returned == true {
+          ext.State = Locked
+        }
+      }
+    } else {
+      ctx.Log.Logf("lockable", "%s timed out", wait_info.Destination)
     }
   }
 
   return messages, changes
 }
 
-func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]Message, Changes) {
+// LockableExts process status signals by forwarding them to it's owner
-  var messages []Message = nil
+// LockSignal and LinkSignal Direct signals are processed to update the requirement/dependency/lock state
-  var changes Changes = nil
+func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) ([]SendMsg, Changes) {
+  var messages []SendMsg = nil
+  var changes = Changes{}
 
   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, Message{*ext.Owner, signal})
+        messages = append(messages, SendMsg{*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 := ctx.NewNode(nil, "LockableNode", l2_listener, NewLockableExt(nil))
+  l2, err := NewNode(ctx, nil, "Lockable", 10, l2_listener, NewLockableExt(nil))
   fatalErr(t, err)
 
   l1_lockable := NewLockableExt(nil)
   l1_listener := NewListenerExt(10)
-  l1, err := ctx.NewNode(nil, "LockableNode", l1_listener, l1_lockable)
+  l1, err := NewNode(ctx, nil, "Lockable", 10, l1_listener, l1_lockable)
   fatalErr(t, err)
 
   link_signal := NewLinkSignal("add", l2.ID)
-  msgs := []Message{{l1.ID, link_signal}}
+  msgs := []SendMsg{{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 = []Message{{l1.ID, unlink_signal}}
+  msgs = []SendMsg{{l1.ID, unlink_signal}}
   err = ctx.Send(l1, msgs)
   fatalErr(t, err)
 
@@ -42,40 +42,24 @@ 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 := ctx.NewNode(nil, "LockableNode", NewLockableExt(nil))
+    l, err := NewNode(ctx, nil, "Lockable", 10, NewLockableExt(nil))
     fatalErr(t, err)
     return l
   }
 
-  reqs := make([]NodeID, n)
+  reqs := make([]NodeID, 1000)
   for i := range(reqs) {
     new_lockable := NewLockable()
     reqs[i] = new_lockable.ID
   }
-  ctx.Log.Logf("test", "CREATED_%d", n)
+  ctx.Log.Logf("test", "CREATED_1000")
 
-  listener := NewListenerExt(50000)
+  listener := NewListenerExt(5000)
-  node, err := ctx.NewNode(nil, "LockableNode", listener, NewLockableExt(reqs))
+  node, err := NewNode(ctx, nil, "Lockable", 5000, listener, NewLockableExt(reqs))
   fatalErr(t, err)
   ctx.Log.Logf("test", "CREATED_LISTENER")
 
@@ -91,15 +75,15 @@ func testLockN(t *testing.T, n int) {
     t.Fatalf("Unexpected response to lock - %s", resp)
   }
 
-  ctx.Log.Logf("test", "LOCKED_%d", n)
+  ctx.Log.Logf("test", "LOCKED_1000")
 }
 
 func TestLock(t *testing.T) {
   ctx := logTestContext(t, []string{"test", "lockable"})
 
   NewLockable := func(reqs []NodeID)(*Node, *ListenerExt) {
-    listener := NewListenerExt(10000)
+    listener := NewListenerExt(1000)
-    l, err := ctx.NewNode(nil, "LockableNode", listener, NewLockableExt(reqs))
+    l, err := NewNode(ctx, nil, "Lockable", 10, listener, NewLockableExt(reqs))
     fatalErr(t, err)
     return l, listener
   }
@@ -118,31 +102,25 @@ 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)
-  response, _, err := WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_1)
+  _, _, 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)
-  response, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*10000, id_2)
+  _, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*100, 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)
-  response, _, err = WaitForResponse(l0_listener.Chan, time.Millisecond*10, id_3)
+  _, _, 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)
-  response, _, err = WaitForResponse(l1_listener.Chan, time.Millisecond*10, id_4)
+
+  _, _, 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

@@ -1,68 +1,11 @@
 package graphvent
 
-type Message struct {
+type SendMsg struct {
-  Node NodeID
+  Dest   NodeID
   Signal Signal
 }
 
-type MessageQueue struct {
+type RecvMsg struct {
-  out chan<- Message
+  Source NodeID
-  in <-chan Message
+  Signal Signal
-  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

@@ -1,35 +0,0 @@
-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

@@ -2,7 +2,9 @@ package graphvent
 
 import (
   "crypto/ed25519"
+  "crypto/rand"
   "crypto/sha512"
+  "encoding/binary"
   "fmt"
   "reflect"
   "sync/atomic"
@@ -23,10 +25,6 @@ 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()
 }
@@ -69,27 +67,25 @@ func (q QueuedSignal) String() string {
   return fmt.Sprintf("%+v@%s", reflect.TypeOf(q.Signal), q.Time)
 }
 
-type WaitMap map[uuid.UUID]NodeID
+// Default message channel size for nodes
-
-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
-  SendChan chan<- Message
+  MsgChan chan RecvMsg
-  RecvChan <-chan Message
+  // Size of MsgChan
-
+  BufferSize uint32 `gv:"buffer_size"`
   // 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
@@ -101,11 +97,59 @@ func (node *Node) PostDeserialize(ctx *Context) error {
   public := node.Key.Public().(ed25519.PublicKey)
   node.ID = KeyID(public)
 
-  node.SendChan, node.RecvChan = NewMessageQueue(NODE_INITIAL_QUEUE_SIZE)
+  node.MsgChan = make(chan RecvMsg, node.BufferSize)
 
   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)
@@ -143,23 +187,18 @@ 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, status chan string, control chan string) {
+func runNode(ctx *Context, node *Node) {
   ctx.Log.Logf("node", "RUN_START: %s", node.ID)
-  err := nodeLoop(ctx, node, status, control)
+  err := nodeLoop(ctx, node)
   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)
 }
@@ -175,74 +214,43 @@ func (err StringError) MarshalBinary() ([]byte, error) {
   return []byte(string(err)), nil
 }
 
-func (node *Node) ReadFields(ctx *Context, fields []string)map[string]any {
+func (node *Node) ReadFields(ctx *Context, reqs map[ExtType][]string)map[ExtType]map[string]any {
-  ctx.Log.Logf("read_field", "Reading %+v on %+v", fields, node.ID)
+  ctx.Log.Logf("read_field", "Reading %+v on %+v", reqs, node.ID)
-  values := map[string]any{}
+  exts := map[ExtType]map[string]any{}
-
+  for ext_type, field_reqs := range(reqs) {
-  node_info := ctx.NodeTypes[node.Type]
+    ext_info, ext_known := ctx.Extensions[ext_type]
-
+    if ext_known { 
-  for _, field_name := range(fields) {
+      fields := map[string]any{}
-    field_info, mapped := node_info.Fields[field_name]
+      for _, req := range(field_reqs) {
-    if mapped {
+        ext, exists := node.Extensions[ext_type]
-      ext := node.Extensions[field_info.Extension]
+        if exists == false {
-      values[field_name] = reflect.ValueOf(ext).Elem().FieldByIndex(field_info.Index).Interface()
+          fields[req] = fmt.Errorf("%+v does not have %+v extension", node.ID, ext_type)
         } else {
-      values[field_name] = fmt.Errorf("NodeType %s has no field %s", node.Type, field_name)
+          fields[req] = reflect.ValueOf(ext).Elem().FieldByIndex(ext_info.Fields[req].Index).Interface()
         }
       }
-
+      exts[ext_type] = fields
-  return values
+    }
+  }
+  return exts
 }
 
 // Main Loop for nodes
-func nodeLoop(ctx *Context, node *Node, status chan string, control chan string) error {
+func nodeLoop(ctx *Context, node *Node) error {
-  is_started := node.Active.CompareAndSwap(false, true)
+  started := node.Active.CompareAndSwap(false, true)
-  if is_started == false {
+  if 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)
   }
 
-  ctx.Log.Logf("node_ext", "Loading extensions for %s", node.ID)
+  run := true
-
+  for run == true {
-  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 command := <-control:
+    case msg := <- node.MsgChan:
-      switch command {
+      signal = msg.Signal
-      case "stop":
+      source = msg.Source
-        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
@@ -271,17 +279,15 @@ func nodeLoop(ctx *Context, node *Node, status chan string, control chan string)
       } 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.Fields)
+      result := node.ReadFields(ctx, sig.Extensions)
-      msgs := []Message{}
+      msgs := []SendMsg{}
-      msgs = append(msgs, Message{source, NewReadResultSignal(sig.ID(), node.ID, node.Type, result)})
+      msgs = append(msgs, SendMsg{source, NewReadResultSignal(sig.ID(), node.ID, node.Type, result)})
       ctx.Send(node, msgs)
 
     default:
@@ -297,45 +303,31 @@ func nodeLoop(ctx *Context, node *Node, status chan string, control chan string)
   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_info, exists := ctx.NodeTypes[node.Type]
+  node.QueueSignal(time.Now(), NewStatusSignal(node.ID, changes))
-  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 {
-  messages := []Message{}
+  ctx.Log.Logf("node_process", "PROCESSING MESSAGE: %s - %+v", node.ID, signal)
+  messages := []SendMsg{}
   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...)
@@ -344,6 +336,7 @@ 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)
@@ -353,7 +346,11 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
   }
 
   if len(changes) != 0 {
-    ctx.Log.Logf("changes", "Changes to %s from %+v: %+v", node.ID, signal, changes)
+    write_err := WriteNodeChanges(ctx, node, changes)
+    if write_err != nil {
+      return write_err
+    }
+
     status_err := node.QueueChanges(ctx, changes)
     if status_err != nil {
       return status_err
@@ -399,3 +396,85 @@ 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

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

serialize.go

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

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

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