Updated 100 test to 1000

acl.go

@@ -21,12 +21,12 @@ func NewACLSignal(principal NodeID, action Tree) *ACLSignal {
 }
 
 var DefaultACLPolicy = NewAllNodesPolicy(Tree{
-  SerializedType(ACLSignalType): nil,
+  SerializedType(SignalTypeFor[ACLSignal]()): nil,
 })
 
 func (signal ACLSignal) Permission() Tree {
   return Tree{
-    SerializedType(ACLSignalType): nil,
+    SerializedType(SignalTypeFor[ACLSignal]()): nil,
   }
 }
 
@@ -44,6 +44,13 @@ func NewACLExt(policies []Policy) *ACLExt {
   }
 }
 
+func (ext *ACLExt) Load(ctx *Context, node *Node) error {
+  return nil
+}
+
+func (ext *ACLExt) Unload(ctx *Context, node *Node) {
+}
+
 func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) (Messages, Changes) {
   response, is_response := signal.(ResponseSignal)
   if is_response == true {
@@ -51,7 +58,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
     var changes = Changes{}
     info, waiting := ext.Pending[response.ResponseID()]
     if waiting == true {
-      changes.Add(ACLExtType, "pending")
+      changes.Add("pending")
       delete(ext.Pending, response.ResponseID())
       if response.ID() != info.Timeout {
         err := node.DequeueSignal(info.Timeout)
@@ -78,7 +85,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
           }
         } else {
           if ext.Policies[policy_index].ContinueAllows(ctx, acl_info, response) == Allow {
-            changes.Add(ACLExtType, "pending_acls")
+            changes.Add("pending_acls")
             delete(ext.PendingACLs, info.ID)
             ctx.Log.Logf("acl", "Request delayed allow")
             messages = messages.Add(ctx, acl_info.Source, node, nil, NewSuccessSignal(info.ID))
@@ -87,7 +94,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
               ctx.Log.Logf("acl", "acl proxy timeout dequeue error: %s", err)
             }
           } else if acl_info.Counter == 0 {
-            changes.Add(ACLExtType, "pending_acls")
+            changes.Add("pending_acls")
             delete(ext.PendingACLs, info.ID)
             ctx.Log.Logf("acl", "Request delayed deny")
             messages = messages.Add(ctx, acl_info.Source, node, nil, NewErrorSignal(info.ID, "acl_denied"))
@@ -97,7 +104,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
             }
           } else {
             node.PendingACLs[info.ID] = acl_info
-            changes.Add(ACLExtType, "pending_acls")
+            changes.Add("pending_acls")
           }
         }
       }
@@ -136,7 +143,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
       messages = messages.Add(ctx, source, node, nil, NewErrorSignal(sig.Id, "acl_denied"))
     } else if acl_messages != nil {
       ctx.Log.Logf("acl", "Request pending")
-      changes.Add(ACLExtType, "pending")
+      changes.Add("pending")
       total_messages := 0
       // TODO: reasonable timeout/configurable
       timeout_time := time.Now().Add(time.Second)
@@ -175,7 +182,7 @@ func (ext *ACLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
     acl_info, exists := ext.PendingACLs[sig.ReqID]
     if exists == true {
       delete(ext.PendingACLs, sig.ReqID)
-      changes.Add(ACLExtType, "pending_acls")
+      changes.Add("pending_acls")
       ctx.Log.Logf("acl", "Request timeout deny")
       messages = messages.Add(ctx, acl_info.Source, node, nil, NewErrorSignal(sig.ReqID, "acl_timeout"))
       err := node.DequeueSignal(acl_info.TimeoutID)

acl_test.go

@@ -22,7 +22,7 @@ func checkSignal[S Signal](t *testing.T, signal Signal, check func(S)){
 }
 
 func testSendACL[S Signal](t *testing.T, ctx *Context, listener *Node, action Tree, policies []Policy, check func(S)){
-  acl_node, err := NewNode(ctx, nil, BaseNodeType, 100, []Policy{DefaultACLPolicy}, NewACLExt(policies))
+  acl_node, err := NewNode(ctx, nil, "Base", 100, []Policy{DefaultACLPolicy}, NewACLExt(policies))
   fatalErr(t, err)
 
   acl_signal := NewACLSignal(listener.ID, action)
@@ -42,7 +42,7 @@ func testErrorSignal(t *testing.T, error_string string) func(*ErrorSignal){
 func testSuccess(*SuccessSignal){}
 
 func testSend(t *testing.T, ctx *Context, signal Signal, source, destination *Node) (ResponseSignal, []Signal) {
-  source_listener, err := GetExt[*ListenerExt](source, ListenerExtType)
+  source_listener, err := GetExt[ListenerExt](source)
   fatalErr(t, err)
 
   messages := Messages{}
@@ -56,26 +56,29 @@ func testSend(t *testing.T, ctx *Context, signal Signal, source, destination *No
 }
 
 func TestACLBasic(t *testing.T) {
-  ctx := logTestContext(t, []string{"serialize_types", "deserialize_types", "test", "listener_debug", "group", "acl", "policy"})
+  ctx := logTestContext(t, []string{"test", "acl", "group", "read_field"})
 
-  listener, err := NewNode(ctx, nil, BaseNodeType, 100, nil, NewListenerExt(100))
+  listener, err := NewNode(ctx, nil, "Base", 100, nil, NewListenerExt(100))
   fatalErr(t, err)
 
+  ctx.Log.Logf("test", "testing fail")
   testSendACL(t, ctx, listener, nil, nil, testErrorSignal(t, "acl_denied"))
 
+  ctx.Log.Logf("test", "testing allow all")
   testSendACL(t, ctx, listener, nil, []Policy{NewAllNodesPolicy(nil)}, testSuccess)
 
-  group, err := NewNode(ctx, nil, GroupNodeType, 100, []Policy{
+  group, err := NewNode(ctx, nil, "Base", 100, []Policy{
     DefaultGroupPolicy,
     NewPerNodePolicy(map[NodeID]Tree{
       listener.ID: {
-        SerializedType(AddMemberSignalType): nil,
-        SerializedType(AddSubGroupSignalType): nil,
+        SerializedType(SignalTypeFor[AddSubGroupSignal]()): nil,
+        SerializedType(SignalTypeFor[AddMemberSignal]()): nil,
       },
     }),
   }, NewGroupExt(nil))
   fatalErr(t, err)
 
+  ctx.Log.Logf("test", "testing empty groups")
   testSendACL(t, ctx, listener, nil, []Policy{
     NewMemberOfPolicy(map[NodeID]map[string]Tree{
       group.ID: {
@@ -84,14 +87,17 @@ func TestACLBasic(t *testing.T) {
     }),
   }, testErrorSignal(t, "acl_denied"))
 
+  ctx.Log.Logf("test", "testing adding group")
   add_subgroup_signal := NewAddSubGroupSignal("test_group")
   add_subgroup_response, _ := testSend(t, ctx, add_subgroup_signal, listener, group)
   checkSignal(t, add_subgroup_response, testSuccess)
 
+  ctx.Log.Logf("test", "testing adding member")
   add_member_signal := NewAddMemberSignal("test_group", listener.ID)
   add_member_response, _ := testSend(t, ctx, add_member_signal, listener, group)
   checkSignal(t, add_member_response, testSuccess)
 
+  ctx.Log.Logf("test", "testing group membership")
   testSendACL(t, ctx, listener, nil, []Policy{
     NewMemberOfPolicy(map[NodeID]map[string]Tree{
       group.ID: {
@@ -104,21 +110,21 @@ func TestACLBasic(t *testing.T) {
     NewACLProxyPolicy(nil),
   }, testErrorSignal(t, "acl_denied"))
 
-  acl_proxy_1, err := NewNode(ctx, nil, BaseNodeType, 100, []Policy{DefaultACLPolicy}, NewACLExt(nil))
+  acl_proxy_1, err := NewNode(ctx, nil, "Base", 100, []Policy{DefaultACLPolicy}, NewACLExt(nil))
   fatalErr(t, err)
 
   testSendACL(t, ctx, listener, nil, []Policy{
     NewACLProxyPolicy([]NodeID{acl_proxy_1.ID}),
   }, testErrorSignal(t, "acl_denied"))
 
-  acl_proxy_2, err := NewNode(ctx, nil, BaseNodeType, 100, []Policy{DefaultACLPolicy}, NewACLExt([]Policy{NewAllNodesPolicy(nil)}))
+  acl_proxy_2, err := NewNode(ctx, nil, "Base", 100, []Policy{DefaultACLPolicy}, NewACLExt([]Policy{NewAllNodesPolicy(nil)}))
   fatalErr(t, err)
 
   testSendACL(t, ctx, listener, nil, []Policy{
     NewACLProxyPolicy([]NodeID{acl_proxy_2.ID}),
   }, testSuccess)
 
-  acl_proxy_3, err := NewNode(ctx, nil, BaseNodeType, 100, []Policy{DefaultACLPolicy},
+  acl_proxy_3, err := NewNode(ctx, nil, "Base", 100, []Policy{DefaultACLPolicy},
     NewACLExt([]Policy{
       NewMemberOfPolicy(map[NodeID]map[string]Tree{
         group.ID: {

context.go

@@ -9,6 +9,7 @@ import (
   "sync"
   "time"
   "github.com/google/uuid"
+  "github.com/graphql-go/graphql"
 
   badger "github.com/dgraph-io/badger/v3"
 )
@@ -19,21 +20,36 @@ var (
 )
 
 type ExtensionInfo struct {
-  Type reflect.Type
+  Reflect reflect.Type
+  Interface graphql.Interface
+
   Data interface{}
 }
 
+type FieldIndex struct {
+  Extension ExtType
+  Field string
+}
+
 type NodeInfo struct {
   Extensions []ExtType
+  Policies []Policy
+  Fields map[string]FieldIndex
 }
 
+type GQLValueConverter func(*Context, interface{})(reflect.Value, error)
+
 type TypeInfo struct {
   Reflect reflect.Type
+  GQL graphql.Type
+
   Type SerializedType
   TypeSerialize TypeSerializeFn
   Serialize SerializeFn
   TypeDeserialize TypeDeserializeFn
   Deserialize DeserializeFn
+
+  GQLValue GQLValueConverter
 }
 
 type KindInfo struct {
@@ -63,6 +79,8 @@ type Context struct {
   SignalTypes map[reflect.Type]SignalType
   // Map between database type hashes and the registered info
   Nodes map[NodeType]NodeInfo
+  NodeTypes map[string]NodeType
+
   // Map between go types and registered info
   Types map[SerializedType]*TypeInfo
   TypeReflects map[reflect.Type]*TypeInfo
@@ -76,7 +94,8 @@ type Context struct {
 }
 
 // Register a NodeType to the context, with the list of extensions it requires
-func (ctx *Context) RegisterNodeType(node_type NodeType, extensions []ExtType) error {
+func RegisterNodeType(ctx *Context, name string, extensions []ExtType, mappings map[string]FieldIndex) error {
+  node_type := NodeTypeFor(name, extensions, mappings)
   _, exists := ctx.Nodes[node_type]
   if exists == true {
     return fmt.Errorf("Cannot register node type %+v, type already exists in context", node_type)
@@ -99,11 +118,17 @@ func (ctx *Context) RegisterNodeType(node_type NodeType, extensions []ExtType) e
 
   ctx.Nodes[node_type] = NodeInfo{
     Extensions: extensions,
+    Fields: mappings,
   }
+  ctx.NodeTypes[name] = node_type
+
   return nil
 }
 
-func (ctx *Context) RegisterPolicy(reflect_type reflect.Type, policy_type PolicyType) error {
+func RegisterPolicy[P Policy](ctx *Context) error {
+  reflect_type := reflect.TypeFor[P]()
+  policy_type := PolicyTypeFor[P]()
+
   _, exists := ctx.Policies[policy_type]
   if exists == true {
     return fmt.Errorf("Cannot register policy of type %+v, type already exists in context", policy_type)
@@ -114,7 +139,7 @@ func (ctx *Context) RegisterPolicy(reflect_type reflect.Type, policy_type Policy
     return err
   }
 
-  err = ctx.RegisterType(reflect_type, SerializedType(policy_type), nil, SerializeStruct(policy_info), nil, DeserializeStruct(policy_info))
+  err = RegisterType[P](ctx, nil, SerializeStruct(policy_info), nil, DeserializeStruct(policy_info))
   if err != nil {
     return err
   }
@@ -126,7 +151,10 @@ func (ctx *Context) RegisterPolicy(reflect_type reflect.Type, policy_type Policy
   return nil
 }
 
-func (ctx *Context)RegisterSignal(reflect_type reflect.Type, signal_type SignalType) error {
+func RegisterSignal[S Signal](ctx *Context) error {
+  reflect_type := reflect.TypeFor[S]()
+  signal_type := SignalTypeFor[S]()
+
   _, exists := ctx.Signals[signal_type]
   if exists == true {
     return fmt.Errorf("Cannot register signal of type %+v, type already exists in context", signal_type)
@@ -137,7 +165,7 @@ func (ctx *Context)RegisterSignal(reflect_type reflect.Type, signal_type SignalT
     return err
   }
 
-  err = ctx.RegisterType(reflect_type, SerializedType(signal_type), nil, SerializeStruct(signal_info), nil, DeserializeStruct(signal_info))
+  err = RegisterType[S](ctx, nil, SerializeStruct(signal_info), nil, DeserializeStruct(signal_info))
   if err != nil {
     return err
   }
@@ -149,10 +177,12 @@ func (ctx *Context)RegisterSignal(reflect_type reflect.Type, signal_type SignalT
   return nil
 }
 
-func (ctx *Context)RegisterExtension(reflect_type reflect.Type, ext_type ExtType, data interface{}) error {
+func RegisterExtension[E any, T interface { *E; Extension}](ctx *Context, data interface{}) error {
+  reflect_type := reflect.TypeFor[T]()
+  ext_type := ExtType(SerializedTypeFor[E]())
   _, exists := ctx.Extensions[ext_type]
   if exists == true {
-    return fmt.Errorf("Cannot register extension of type %+v, type already exists in context", ext_type)
+    return fmt.Errorf("Cannot register extension %+v of type %+v, type already exists in context", reflect_type, ext_type)
   }
 
   elem_type := reflect_type.Elem()
@@ -161,7 +191,7 @@ func (ctx *Context)RegisterExtension(reflect_type reflect.Type, ext_type ExtType
     return err
   }
 
-  err = ctx.RegisterType(elem_type, SerializedType(ext_type), nil, SerializeStruct(elem_info), nil, DeserializeStruct(elem_info))
+  err = RegisterType[E](ctx, nil, SerializeStruct(elem_info), nil, DeserializeStruct(elem_info))
   if err != nil {
     return err
   }
@@ -169,7 +199,7 @@ func (ctx *Context)RegisterExtension(reflect_type reflect.Type, ext_type ExtType
   ctx.Log.Logf("serialize_types", "Registered ExtType: %+v - %+v", reflect_type, ext_type)
 
   ctx.Extensions[ext_type] = ExtensionInfo{
-    Type: reflect_type,
+    Reflect: reflect_type,
     Data: data,
   }
   ctx.ExtensionTypes[reflect_type] = ext_type
@@ -177,7 +207,8 @@ func (ctx *Context)RegisterExtension(reflect_type reflect.Type, ext_type ExtType
   return nil
 }
 
-func (ctx *Context)RegisterKind(kind reflect.Kind, base reflect.Type, ctx_type SerializedType, type_serialize TypeSerializeFn, serialize SerializeFn, type_deserialize TypeDeserializeFn, deserialize DeserializeFn) error {
+func RegisterKind(ctx *Context, kind reflect.Kind, base reflect.Type, type_serialize TypeSerializeFn, serialize SerializeFn, type_deserialize TypeDeserializeFn, deserialize DeserializeFn) error {
+  ctx_type := SerializedKindFor(kind)
   _, exists := ctx.Kinds[kind]
   if exists == true {
     return fmt.Errorf("Cannot register kind %+v, kind already exists in context", kind)
@@ -195,8 +226,8 @@ func (ctx *Context)RegisterKind(kind reflect.Kind, base reflect.Type, ctx_type S
 
   info := KindInfo{
     Reflect: kind,
-    Base: base,
     Type: ctx_type,
+    Base: base,
     TypeSerialize: type_serialize,
     Serialize: serialize,
     TypeDeserialize: type_deserialize,
@@ -210,7 +241,10 @@ func (ctx *Context)RegisterKind(kind reflect.Kind, base reflect.Type, ctx_type S
   return nil
 }
 
-func (ctx *Context)RegisterType(reflect_type reflect.Type, ctx_type SerializedType, type_serialize TypeSerializeFn, serialize SerializeFn, type_deserialize TypeDeserializeFn, deserialize DeserializeFn) error {
+func RegisterType[T any](ctx *Context, type_serialize TypeSerializeFn, serialize SerializeFn, type_deserialize TypeDeserializeFn, deserialize DeserializeFn) error {
+  reflect_type := reflect.TypeFor[T]()
+  ctx_type := SerializedTypeFor[T]()
+
   _, exists := ctx.Types[ctx_type]
   if exists == true {
     return fmt.Errorf("Cannot register field of type %+v, type already exists in context", ctx_type)
@@ -263,6 +297,14 @@ func (ctx *Context)RegisterType(reflect_type reflect.Type, ctx_type SerializedTy
   return nil
 }
 
+func RegisterStruct[T any](ctx *Context) error {
+  struct_info, err := GetStructInfo(ctx, reflect.TypeFor[T]())
+  if err != nil {
+    return err
+  }
+  return RegisterType[T](ctx, nil, SerializeStruct(struct_info), nil, DeserializeStruct(struct_info))
+}
+
 func (ctx *Context) AddNode(id NodeID, node *Node) {
   ctx.nodeMapLock.Lock()
   ctx.nodeMap[id] = node
@@ -276,7 +318,16 @@ func (ctx *Context) Node(id NodeID) (*Node, bool) {
   return node, exists
 }
 
-func (ctx *Context) Stop(id NodeID) error {
+func (ctx *Context) Delete(id NodeID) error {
+  err := ctx.Unload(id)
+  if err != nil {
+    return err
+  }
+  // TODO: also delete any associated data
+  return nil
+}
+
+func (ctx *Context) Unload(id NodeID) error {
   ctx.nodeMapLock.Lock()
   defer ctx.nodeMapLock.Unlock()
   node, exists := ctx.nodeMap[id]
@@ -284,15 +335,15 @@ func (ctx *Context) Stop(id NodeID) error {
     return fmt.Errorf("%s is not a node in ctx", id)
   }
 
-  err := node.Stop(ctx)
+  err := node.Unload(ctx)
   delete(ctx.nodeMap, id)
   return err
 }
 
-func (ctx *Context) StopAll() {
+func (ctx *Context) Stop() {
   ctx.nodeMapLock.Lock()
   for id, node := range(ctx.nodeMap) {
-    node.Stop(ctx)
+    node.Unload(ctx)
     delete(ctx.nodeMap, id)
   }
   ctx.nodeMapLock.Unlock()
@@ -352,424 +403,368 @@ func NewContext(db * badger.DB, log Logger) (*Context, error) {
     Signals: map[SignalType]reflect.Type{},
     SignalTypes: map[reflect.Type]SignalType{},
     Nodes: map[NodeType]NodeInfo{},
-    nodeMap: map[NodeID]*Node{},
+    NodeTypes: map[string]NodeType{},
     Types: map[SerializedType]*TypeInfo{},
     TypeReflects: map[reflect.Type]*TypeInfo{},
     Kinds: map[reflect.Kind]*KindInfo{},
     KindTypes: map[SerializedType]*KindInfo{},
-  }
-
-  var err error
-  err = ctx.RegisterKind(reflect.Pointer, nil, PointerType, SerializeTypeElem, SerializePointer, DeserializeTypePointer, DeserializePointer)
-  if err != nil {
-    return nil, err
-  }
 
-  err = ctx.RegisterKind(reflect.Bool, reflect.TypeOf(true), BoolType, nil, SerializeBool, nil, DeserializeBool[bool])
-  if err != nil {
-    return nil, err
+    nodeMap: map[NodeID]*Node{},
   }
 
-  err = ctx.RegisterKind(reflect.String, reflect.TypeOf(""), StringType, nil, SerializeString, nil, DeserializeString[string])
+  var err error
+  err = RegisterKind(ctx, reflect.Pointer, nil, SerializeTypeElem, SerializePointer, DeserializeTypePointer, DeserializePointer)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Float32, reflect.TypeOf(float32(0)), Float32Type, nil, SerializeFloat32, nil, DeserializeFloat32[float32])
+  err = RegisterKind(ctx, reflect.Bool, reflect.TypeFor[bool](), nil, SerializeBool, nil, DeserializeBool[bool])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Float64, reflect.TypeOf(float64(0)), Float64Type, nil, SerializeFloat64, nil, DeserializeFloat64[float64])
+  err = RegisterKind(ctx, reflect.String, reflect.TypeFor[string](), nil, SerializeString, nil, DeserializeString[string])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Uint, reflect.TypeOf(uint(0)), UIntType, nil, SerializeUint32, nil, DeserializeUint32[uint])
+  err = RegisterKind(ctx, reflect.Float32, reflect.TypeFor[float32](), nil, SerializeFloat32, nil, DeserializeFloat32[float32])
   if err != nil  {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Uint8, reflect.TypeOf(uint8(0)), UInt8Type, nil, SerializeUint8, nil, DeserializeUint8[uint8])
+  err = RegisterKind(ctx, reflect.Float64, reflect.TypeFor[float64](), nil, SerializeFloat64, nil, DeserializeFloat64[float64])
   if err != nil  {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Uint16, reflect.TypeOf(uint16(0)), UInt16Type, nil, SerializeUint16, nil, DeserializeUint16[uint16])
+  err = RegisterKind(ctx, reflect.Uint, reflect.TypeFor[uint](), nil, SerializeUint32, nil, DeserializeUint32[uint])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Uint32, reflect.TypeOf(uint32(0)), UInt32Type, nil, SerializeUint32, nil, DeserializeUint32[uint32])
+  err = RegisterKind(ctx, reflect.Uint8, reflect.TypeFor[uint8](), nil, SerializeUint8, nil, DeserializeUint8[uint8])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Uint64, reflect.TypeOf(uint64(0)), UInt64Type, nil, SerializeUint64, nil, DeserializeUint64[uint64])
+  err = RegisterKind(ctx, reflect.Uint16, reflect.TypeFor[uint16](), nil, SerializeUint16, nil, DeserializeUint16[uint16])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Int, reflect.TypeOf(int(0)), IntType, nil, SerializeInt32, nil, DeserializeUint32[int])
+  err = RegisterKind(ctx, reflect.Uint32, reflect.TypeFor[uint32](), nil, SerializeUint32, nil, DeserializeUint32[uint32])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Int8, reflect.TypeOf(int8(0)), Int8Type, nil, SerializeInt8, nil, DeserializeUint8[int8])
+  err = RegisterKind(ctx, reflect.Uint64, reflect.TypeFor[uint64](), nil, SerializeUint64, nil, DeserializeUint64[uint64])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Int16, reflect.TypeOf(int16(0)), Int16Type, nil, SerializeInt16, nil, DeserializeUint16[int16])
+  err = RegisterKind(ctx, reflect.Int, reflect.TypeFor[int](), nil, SerializeInt32, nil, DeserializeUint32[int])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Int32, reflect.TypeOf(int32(0)), Int32Type, nil, SerializeInt32, nil, DeserializeUint32[int32])
+  err = RegisterKind(ctx, reflect.Int8, reflect.TypeFor[int8](), nil, SerializeInt8, nil, DeserializeUint8[int8])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Int64, reflect.TypeOf(int64(0)), Int64Type, nil, SerializeInt64, nil, DeserializeUint64[int64])
+  err = RegisterKind(ctx, reflect.Int16, reflect.TypeFor[int16](), nil, SerializeInt16, nil, DeserializeUint16[int16])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(WaitReason("")), WaitReasonType, nil, nil, nil, DeserializeString[WaitReason])
+  err = RegisterKind(ctx, reflect.Int32, reflect.TypeFor[int32](), nil, SerializeInt32, nil, DeserializeUint32[int32])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(EventCommand("")), EventCommandType, nil, nil, nil, DeserializeString[EventCommand])
+  err = RegisterKind(ctx, reflect.Int64, reflect.TypeFor[int64](), nil, SerializeInt64, nil, DeserializeUint64[int64])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(EventState("")), EventStateType, nil, nil, nil, DeserializeString[EventState])
+  err = RegisterType[WaitReason](ctx, nil, nil, nil, DeserializeString[WaitReason])
   if err != nil {
     return nil, err
   }
 
-  wait_info_type := reflect.TypeOf(WaitInfo{})
-  wait_info_info, err := GetStructInfo(ctx, wait_info_type)
-  if err != nil {
-    return nil, err
-  }
-  err = ctx.RegisterType(wait_info_type, WaitInfoType, nil, SerializeStruct(wait_info_info), nil, DeserializeStruct(wait_info_info))
+  err = RegisterType[EventCommand](ctx, nil, nil, nil, DeserializeString[EventCommand])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(time.Duration(0)), DurationType, nil, nil, nil, DeserializeUint64[time.Duration])
+  err = RegisterType[EventState](ctx, nil, nil, nil, DeserializeString[EventState])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(time.Time{}), TimeType, nil, SerializeGob, nil, DeserializeGob[time.Time])
+  err = RegisterStruct[WaitInfo](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Map, nil, MapType, SerializeTypeMap, SerializeMap, DeserializeTypeMap, DeserializeMap)
+  err = RegisterType[time.Duration](ctx, nil, nil, nil, DeserializeUint64[time.Duration])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Array, nil, ArrayType, SerializeTypeArray, SerializeArray, DeserializeTypeArray, DeserializeArray)
+  err = RegisterType[time.Time](ctx, nil, SerializeGob, nil, DeserializeGob[time.Time])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterKind(reflect.Slice, nil, SliceType, SerializeTypeElem, SerializeSlice, DeserializeTypeSlice, DeserializeSlice)
+  err = RegisterKind(ctx, reflect.Map, nil, SerializeTypeMap, SerializeMap, DeserializeTypeMap, DeserializeMap)
   if err != nil {
     return nil, err
   }
 
-  var ptr interface{} = nil
-  err = ctx.RegisterKind(reflect.Interface, reflect.TypeOf(&ptr).Elem(), InterfaceType, nil, SerializeInterface, nil, DeserializeInterface)
+  err = RegisterKind(ctx, reflect.Array, nil, SerializeTypeArray, SerializeArray, DeserializeTypeArray, DeserializeArray)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(SerializedType(0)), SerializedTypeSerialized, nil, SerializeUint64, nil, DeserializeUint64[SerializedType])
+  err = RegisterKind(ctx, reflect.Slice, nil, SerializeTypeElem, SerializeSlice, DeserializeTypeSlice, DeserializeSlice)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(Changes{}), ChangesSerialized, SerializeTypeStub, SerializeMap, DeserializeTypeStub[Changes], DeserializeMap)
+  err = RegisterKind(ctx, reflect.Interface, reflect.TypeFor[interface{}](), nil, SerializeInterface, nil, DeserializeInterface)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(ExtType(0)), ExtTypeSerialized, nil, SerializeUint64, nil, DeserializeUint64[ExtType])
+  err = RegisterType[SerializedType](ctx, nil, SerializeUint64, nil, DeserializeUint64[SerializedType])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(NodeType(0)), NodeTypeSerialized, nil, SerializeUint64, nil, DeserializeUint64[NodeType])
+  err = RegisterType[Changes](ctx, SerializeTypeStub, SerializeMap, DeserializeTypeStub[Changes], DeserializeMap)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(PolicyType(0)), PolicyTypeSerialized, nil, SerializeUint64, nil, DeserializeUint64[PolicyType])
+  err = RegisterType[ExtType](ctx, nil, SerializeUint64, nil, DeserializeUint64[ExtType])
   if err != nil {
     return nil, err
   }
 
-  node_id_type := reflect.TypeOf(RandID())
-  err = ctx.RegisterType(node_id_type, NodeIDType, SerializeTypeStub, SerializeUUID, DeserializeTypeStub[NodeID], DeserializeUUID[NodeID])
+  err = RegisterType[NodeType](ctx, nil, SerializeUint64, nil, DeserializeUint64[NodeType])
   if err != nil {
     return nil, err
   }
 
-  uuid_type := reflect.TypeOf(uuid.UUID{})
-  err = ctx.RegisterType(uuid_type, UUIDType, SerializeTypeStub, SerializeUUID, DeserializeTypeStub[uuid.UUID], DeserializeUUID[uuid.UUID])
+  err = RegisterType[PolicyType](ctx, nil, SerializeUint64, nil, DeserializeUint64[PolicyType])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(Up), SignalDirectionType, nil, SerializeUint8, nil, DeserializeUint8[SignalDirection])
+  err = RegisterType[NodeID](ctx, SerializeTypeStub, SerializeUUID, DeserializeTypeStub[NodeID], DeserializeUUID[NodeID])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(ReqState(0)), ReqStateType, nil, SerializeUint8, nil, DeserializeUint8[ReqState])
+  err = RegisterType[uuid.UUID](ctx, SerializeTypeStub, SerializeUUID, DeserializeTypeStub[uuid.UUID], DeserializeUUID[uuid.UUID])
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterType(reflect.TypeOf(Tree{}), TreeType, SerializeTypeStub, nil, DeserializeTypeStub[Tree], nil)
-
-  var extension Extension = nil
-  err = ctx.RegisterType(reflect.ValueOf(&extension).Type().Elem(), ExtSerialized, nil, SerializeInterface, nil, DeserializeInterface)
+  err = RegisterType[SignalDirection](ctx, nil, SerializeUint8, nil, DeserializeUint8[SignalDirection])
   if err != nil {
     return nil, err
   }
 
-  var policy Policy = nil
-  err = ctx.RegisterType(reflect.ValueOf(&policy).Type().Elem(), PolicySerialized, nil, SerializeInterface, nil, DeserializeInterface)
+  err = RegisterType[ReqState](ctx, nil, SerializeUint8, nil, DeserializeUint8[ReqState])
   if err != nil {
     return nil, err
   }
 
-  var signal Signal = nil
-  err = ctx.RegisterType(reflect.ValueOf(&signal).Type().Elem(), SignalSerialized, nil, SerializeInterface, nil, DeserializeInterface)
+  err = RegisterType[Tree](ctx, SerializeTypeStub, nil, DeserializeTypeStub[Tree], nil)
   if err != nil {
     return nil, err
   }
 
-  pending_acl_type := reflect.TypeOf(PendingACL{})
-  pending_acl_info, err := GetStructInfo(ctx, pending_acl_type)
-  if err != nil {
-    return nil, err
-  }
-  err = ctx.RegisterType(pending_acl_type, PendingACLType, nil, SerializeStruct(pending_acl_info), nil, DeserializeStruct(pending_acl_info))
+  err = RegisterType[Extension](ctx, nil, SerializeInterface, nil, DeserializeInterface)
   if err != nil {
     return nil, err
   }
 
-  pending_signal_type := reflect.TypeOf(PendingACLSignal{})
-  pending_signal_info, err := GetStructInfo(ctx, pending_signal_type)
-  if err != nil {
-    return nil, err
-  }
-  err = ctx.RegisterType(pending_signal_type, PendingACLSignalType, nil, SerializeStruct(pending_signal_info), nil, DeserializeStruct(pending_signal_info))
+  err = RegisterType[Policy](ctx, nil, SerializeInterface, nil, DeserializeInterface)
   if err != nil {
     return nil, err
   }
 
-  queued_signal_type := reflect.TypeOf(QueuedSignal{})
-  queued_signal_info, err := GetStructInfo(ctx, queued_signal_type)
-  if err != nil {
-    return nil, err
-  }
-  err = ctx.RegisterType(queued_signal_type, QueuedSignalType, nil, SerializeStruct(queued_signal_info), nil, DeserializeStruct(queued_signal_info))
+  err = RegisterType[Signal](ctx, nil, SerializeInterface, nil, DeserializeInterface)
   if err != nil {
     return nil, err
   }
 
-  node_type := reflect.TypeOf(Node{})
-  node_info, err := GetStructInfo(ctx, node_type)
-  if err != nil {
-    return nil, err
-  }
-  err = ctx.RegisterType(node_type, NodeStructType, nil, SerializeStruct(node_info), nil, DeserializeStruct(node_info))
-  if err != nil {
-    return nil, err
-  }
-
-  err = ctx.RegisterExtension(reflect.TypeOf((*LockableExt)(nil)), LockableExtType, nil)
-  if err != nil {
-    return nil, err
-  }
-
-  err = ctx.RegisterExtension(reflect.TypeOf((*ListenerExt)(nil)), ListenerExtType, nil)
-  if err != nil {
-    return nil, err
-  }
-
-  err = ctx.RegisterExtension(reflect.TypeOf((*GroupExt)(nil)), GroupExtType, nil)
+  err = RegisterStruct[PendingACL](ctx)
   if err != nil {
     return nil, err
   }
 
-  gql_ctx := NewGQLExtContext()
-  err = ctx.RegisterExtension(reflect.TypeOf((*GQLExt)(nil)), GQLExtType, gql_ctx)
+  err = RegisterStruct[PendingACLSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterExtension(reflect.TypeOf((*ACLExt)(nil)), ACLExtType, nil)
+  err = RegisterStruct[QueuedSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterExtension(reflect.TypeOf((*EventExt)(nil)), EventExtType, nil)
+  err = RegisterStruct[Node](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(OwnerOfPolicy{}), OwnerOfPolicyType)
+  err = RegisterExtension[LockableExt](ctx, nil)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(ParentOfPolicy{}), ParentOfPolicyType)
+  err = RegisterExtension[ListenerExt](ctx, nil)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(MemberOfPolicy{}), MemberOfPolicyType)
+  err = RegisterExtension[GroupExt](ctx, nil)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(AllNodesPolicy{}), AllNodesPolicyType)
+  gql_ctx := NewGQLExtContext()
+  err = RegisterExtension[GQLExt](ctx, gql_ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(PerNodePolicy{}), PerNodePolicyType)
+  err = RegisterExtension[ACLExt](ctx, nil)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterPolicy(reflect.TypeOf(ACLProxyPolicy{}), ACLProxyPolicyType)
+  err = RegisterExtension[EventExt](ctx, nil)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(StoppedSignal{}), StoppedSignalType)
+  err = RegisterPolicy[OwnerOfPolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(AddSubGroupSignal{}), AddSubGroupSignalType)
+  err = RegisterPolicy[ParentOfPolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(RemoveSubGroupSignal{}), RemoveSubGroupSignalType)
+  err = RegisterPolicy[MemberOfPolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(ACLTimeoutSignal{}), ACLTimeoutSignalType)
+  err = RegisterPolicy[AllNodesPolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(ACLSignal{}), ACLSignalType)
+  err = RegisterPolicy[PerNodePolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(RemoveMemberSignal{}), RemoveMemberSignalType)
+  err = RegisterPolicy[ACLProxyPolicy](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(AddMemberSignal{}), AddMemberSignalType)
+  err = RegisterSignal[AddSubGroupSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(StopSignal{}), StopSignalType)
+  err = RegisterSignal[RemoveSubGroupSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(CreateSignal{}), CreateSignalType)
+  err = RegisterSignal[ACLTimeoutSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(StartSignal{}), StartSignalType)
+  err = RegisterSignal[ACLSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(StatusSignal{}), StatusSignalType)
+  err = RegisterSignal[RemoveMemberSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(ReadSignal{}), ReadSignalType)
+  err = RegisterSignal[AddMemberSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(LockSignal{}), LockSignalType)
+  err = RegisterSignal[StatusSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(TimeoutSignal{}), TimeoutSignalType)
+  err = RegisterSignal[ReadSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(LinkSignal{}), LinkSignalType)
+  err = RegisterSignal[LockSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(ErrorSignal{}), ErrorSignalType)
+  err = RegisterSignal[TimeoutSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(SuccessSignal{}), SuccessSignalType)
+  err = RegisterSignal[LinkSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(ReadResultSignal{}), ReadResultSignalType)
+  err = RegisterSignal[ErrorSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(EventControlSignal{}), EventControlSignalType)
+  err = RegisterSignal[SuccessSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterSignal(reflect.TypeOf(EventStateSignal{}), EventStateSignalType)
+  err = RegisterSignal[ReadResultSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterNodeType(BaseNodeType, []ExtType{})
+  err = RegisterSignal[EventControlSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterNodeType(GroupNodeType, []ExtType{GroupExtType})
+  err = RegisterSignal[EventStateSignal](ctx)
   if err != nil {
     return nil, err
   }
 
-  err = ctx.RegisterNodeType(GQLNodeType, []ExtType{GQLExtType})
+  err = RegisterNodeType(ctx, "Base", []ExtType{}, map[string]FieldIndex{})
   if err != nil {
     return nil, err
   }

event.go

@@ -21,7 +21,7 @@ func NewParentOfPolicy(policy Tree) *ParentOfPolicy {
 }
 
 func (policy ParentOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
-  event_ext, err := GetExt[*EventExt](node, EventExtType)
+  event_ext, err := GetExt[EventExt](node)
   if err != nil {
     ctx.Log.Logf("event", "ParentOfPolicy, node not event %s", node.ID)
     return nil, Deny
@@ -39,7 +39,7 @@ func (policy ParentOfPolicy) ContinueAllows(ctx *Context, current PendingACL, si
 }
 
 var DefaultEventPolicy = NewParentOfPolicy(Tree{
-  SerializedType(EventControlSignalType): nil,
+  SerializedType(SignalTypeFor[EventControlSignal]()): nil,
 })
 
 type EventExt struct {
@@ -49,6 +49,13 @@ type EventExt struct {
   Parent NodeID `gv:"parent"`
 }
 
+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,
@@ -66,7 +73,7 @@ type EventStateSignal struct {
 
 func (signal EventStateSignal) Permission() Tree {
   return Tree{
-    SerializedType(StatusType): nil,
+    SerializedType(SignalTypeFor[StatusSignal]()): nil,
   }
 }
 
@@ -101,7 +108,7 @@ func NewEventControlSignal(command EventCommand) *EventControlSignal {
 
 func (signal EventControlSignal) Permission() Tree {
   return Tree{
-    SerializedType(EventControlSignalType): {
+    SerializedType(SignalTypeFor[EventControlSignal]()): {
       Hash("command", string(signal.Command)): nil,
     },
   }
@@ -110,7 +117,7 @@ func (signal EventControlSignal) Permission() Tree {
 func (ext *EventExt) UpdateState(node *Node, changes Changes, state EventState, state_start time.Time) {
   if ext.State != state {
     ext.StateStart = state_start
-    changes.Add(EventExtType, "state")
+    changes.Add("state")
     ext.State = state
     node.QueueSignal(time.Now(), NewEventStateSignal(node.ID, ext.State, time.Now()))
   }
@@ -131,6 +138,13 @@ 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?": {
@@ -157,7 +171,7 @@ func (ext *TestEventExt) Process(ctx *Context, node *Node, source NodeID, signal
 
   switch sig := signal.(type) {
   case *EventControlSignal:
-    event_ext, err := GetExt[*EventExt](node, EventExtType)
+    event_ext, err := GetExt[EventExt](node)
     if err != nil {
       messages = messages.Add(ctx, source, node, nil, NewErrorSignal(sig.Id, "not_event"))
     } else {

event_test.go

@@ -2,7 +2,6 @@ package graphvent
 
 import (
   "crypto/ed25519"
-  "reflect"
   "testing"
   "time"
   "crypto/rand"
@@ -10,13 +9,13 @@ import (
 
 func TestEvent(t *testing.T) {
   ctx := logTestContext(t, []string{"event", "listener", "listener_debug"})
-  err := ctx.RegisterExtension(reflect.TypeOf(&TestEventExt{}), NewExtType("TEST_EVENT"), nil)
+  err := RegisterExtension[TestEventExt](ctx, nil)
   fatalErr(t, err)
 
 
   event_public, event_private, err := ed25519.GenerateKey(rand.Reader)
   event_listener := NewListenerExt(100)
-  event, err := NewNode(ctx, event_private, BaseNodeType, 100, nil, NewEventExt(KeyID(event_public), "Test Event"), &TestEventExt{time.Second}, event_listener)
+  event, err := NewNode(ctx, event_private, "Base", 100, nil, NewEventExt(KeyID(event_public), "Test Event"), &TestEventExt{time.Second}, event_listener)
   fatalErr(t, err)
 
   response, signals := testSend(t, ctx, NewEventControlSignal("ready?"), event, event)

extension.go

@@ -0,0 +1,24 @@
+package graphvent
+
+import (
+
+)
+
+// 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) (Messages, Changes)
+
+  // Called when the node is loaded into a context(creation or move), so extension data can be initialized
+  Load(*Context, *Node) error
+
+  // 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
+}

go.mod

@@ -1,6 +1,6 @@
 module github.com/mekkanized/graphvent
 
-go 1.21.0
+go 1.22.0
 
 require (
 	github.com/dgraph-io/badger/v3 v3.2103.5

gql.go

@@ -540,7 +540,7 @@ func NewResolveContext(ctx *Context, server *Node, gql_ext *GQLExt) (*ResolveCon
     Ext: gql_ext,
     Chans: map[uuid.UUID]chan Signal{},
     Context: ctx,
-    GQLContext: ctx.Extensions[GQLExtType].Data.(*GQLExtContext),
+    GQLContext: ctx.Extensions[ExtTypeFor[GQLExt]()].Data.(*GQLExtContext),
     NodeCache: map[NodeID]NodeResult{},
     Server: server,
     Authorization: nil,
@@ -585,7 +585,7 @@ func GQLHandler(ctx *Context, server *Node, gql_ext *GQLExt) func(http.ResponseW
     query := GQLPayload{}
     json.Unmarshal(str, &query)
 
-    gql_context := ctx.Extensions[GQLExtType].Data.(*GQLExtContext)
+    gql_context := ctx.Extensions[ExtTypeFor[GQLExt]()].Data.(*GQLExtContext)
 
     params := graphql.Params{
       Schema: gql_context.Schema,
@@ -739,7 +739,7 @@ func GQLWSHandler(ctx * Context, server *Node, gql_ext *GQLExt) func(http.Respon
           }
         } else if msg.Type == "subscribe" {
           ctx.Log.Logf("gqlws", "SUBSCRIBE: %+v", msg.Payload)
-          gql_context := ctx.Extensions[GQLExtType].Data.(*GQLExtContext)
+          gql_context := ctx.Extensions[ExtTypeFor[GQLExt]()].Data.(*GQLExtContext)
           params := graphql.Params{
             Schema: gql_context.Schema,
             Context: req_ctx,
@@ -843,10 +843,6 @@ type GQLExtContext struct {
   Types []graphql.Type
   Query *graphql.Object
   Mutation *graphql.Object
-  Subscription *graphql.Object
-
-  TypeMap map[reflect.Type]GQLTypeInfo
-  KindMap map[reflect.Kind]GQLTypeInfo
 }
 
 func (ctx *GQLExtContext) GetACLFields(obj_name string, names []string) (map[ExtType][]string, error) {
@@ -878,7 +874,6 @@ func BuildSchema(ctx *GQLExtContext) (graphql.Schema, error) {
     Types: ctx.Types,
     Query: ctx.Query,
     Mutation: ctx.Mutation,
-    Subscription: ctx.Subscription,
   }
 
   return graphql.NewSchema(schemaConfig)
@@ -920,7 +915,7 @@ func (ctx *GQLExtContext) RegisterField(gql_type graphql.Type, gql_name string,
       return nil, fmt.Errorf("%s is not in the fields of %+v in the result for %s - %+v", gv_tag, ext_type, gql_name, node)
     }
 
-    if val_ser.TypeStack[0] == ErrorType {
+    if val_ser.TypeStack[0] == SerializedTypeFor[error]() {
       return nil, fmt.Errorf(string(val_ser.Data))
     }
 
@@ -1151,421 +1146,39 @@ func (ctx *GQLExtContext) RegisterNodeType(node_type NodeType, name string, inte
 func NewGQLExtContext() *GQLExtContext {
   query := graphql.NewObject(graphql.ObjectConfig{
     Name: "Query",
-    Fields: graphql.Fields{},
-  })
-
-  mutation := graphql.NewObject(graphql.ObjectConfig{
-    Name: "Mutation",
-    Fields: graphql.Fields{},
-  })
-
-  subscription := graphql.NewObject(graphql.ObjectConfig{
-    Name: "Subscription",
-    Fields: graphql.Fields{},
-  })
-
-  kind_map := map[reflect.Kind]GQLTypeInfo{
-    reflect.String: {
-      func(ctx *GQLExtContext, reflect_type reflect.Type)(graphql.Type, error) {
-        return graphql.String, nil
-      },
-      func(ctx *GQLExtContext, value interface{})(reflect.Value, error) {
-        return reflect.ValueOf(value), nil
-      },
-    },
-    reflect.Bool: {
-      func(ctx *GQLExtContext, reflect_type reflect.Type)(graphql.Type, error) {
-        return graphql.Boolean, nil
-      },
-      func(ctx *GQLExtContext, value interface{})(reflect.Value, error) {
-        return reflect.ValueOf(value), nil
-      },
-    },
-  }
-  type_map := map[reflect.Type]GQLTypeInfo{
-    reflect.TypeOf(EventCommand("")): {
-      func (ctx *GQLExtContext, reflect_type reflect.Type)(graphql.Type, error) {
-        return graphql.String, nil
-      },
-      func(ctx *GQLExtContext, value interface{})(reflect.Value, error) {
-        return reflect.ValueOf(EventCommand(value.(string))), nil
-      },
-    },
-    reflect.TypeOf([2]NodeID{}): {
-      func(ctx *GQLExtContext, reflect_type reflect.Type)(graphql.Type, error) {
-        return graphql.NewList(graphql.String), nil
-      },
-      func(ctx *GQLExtContext, value interface{})(reflect.Value, error) {
-        l, ok := value.([]interface{})
-        if ok == false {
-          return reflect.Value{}, fmt.Errorf("not list: %s", reflect.TypeOf(value))
-        } else if len(l) != 2 {
-          return reflect.Value{}, fmt.Errorf("wrong length: %d/2", len(l))
-        }
-
-        id1_str, ok := l[0].(string)
-        if ok == false {
-          return reflect.Value{}, fmt.Errorf("not strg: %s", reflect.TypeOf(l[0]))
-        }
-        id1, err := ParseID(id1_str)
-        if err != nil {
-          return reflect.Value{}, err
-        }
-        id2_str, ok := l[1].(string)
-        if ok == false {
-          return reflect.Value{}, fmt.Errorf("not strg: %s", reflect.TypeOf(l[1]))
-        }
-        id2, err := ParseID(id2_str)
-        if err != nil {
-          return reflect.Value{}, err
-        }
-        return_value := reflect.New(reflect.TypeOf([2]NodeID{})).Elem()
-        return_value.Index(0).Set(reflect.ValueOf(id1))
-        return_value.Index(1).Set(reflect.ValueOf(id2))
-
-        return return_value, nil
-      },
-    },
-    reflect.TypeOf(time.Time{}): {
-      func(ctx *GQLExtContext, reflect_type reflect.Type) (graphql.Type, error) {
-        return graphql.DateTime, nil
-      },
-      func(ctx *GQLExtContext, value interface{}) (reflect.Value, error) {
-        return reflect.ValueOf(value), nil
+    Fields: graphql.Fields{
+      "Test": &graphql.Field{
+        Type: graphql.String,
+        Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				  return "Test Data", nil
 			  },
       },
-    reflect.TypeOf(&NodeID{}): {
-      func(ctx *GQLExtContext, reflect_type reflect.Type) (graphql.Type, error) {
-        return graphql.String, nil
     },
-      func(ctx *GQLExtContext, value interface{}) (reflect.Value, error) {
-        str, ok := value.(string)
-        if ok == false {
-          return reflect.Value{}, fmt.Errorf("value is not string")
-        }
-  
-        if str == "" {
-          return reflect.New(reflect.TypeOf(&NodeID{})).Elem(), nil
-        }
-  
-        id_parsed, err := ParseID(str)
-        if err != nil {
-          return reflect.Value{}, err
-        }
+  })
 
-        return reflect.ValueOf(&id_parsed), nil
+  mutation := graphql.NewObject(graphql.ObjectConfig{
+    Name: "Mutation",
+    Fields: graphql.Fields{
+      "Test": &graphql.Field{
+        Type: graphql.String,
+        Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+          return "Test Mutation Data", nil
         },
       },
-    reflect.TypeOf(NodeID{}): {
-      func(ctx *GQLExtContext, reflect_type reflect.Type)(graphql.Type, error) {
-        return graphql.String, nil
     },
-      func(ctx *GQLExtContext, value interface{})(reflect.Value, error) {
-        str, ok := value.(string)
-        if ok == false {
-          return reflect.Value{}, fmt.Errorf("value is not string")
-        }
-  
-        id_parsed, err := ParseID(str)
-        if err != nil {
-          return reflect.Value{}, err
-        }
+  })
 
-        return reflect.ValueOf(id_parsed), nil
-      },
-    },
-  }
 
   context := GQLExtContext{
     Schema: graphql.Schema{},
     Types: []graphql.Type{},
     Query: query,
     Mutation: mutation,
-    Subscription: subscription,
     NodeTypes: map[NodeType]*graphql.Object{},
     Interfaces: map[string]*Interface{},
     Fields: map[string]Field{},
-    KindMap: kind_map,
-    TypeMap: type_map,
-  }
-
-  var err error
-  err = context.RegisterInterface("Node", "DefaultNode", []string{}, []string{}, map[string]SelfField{}, map[string]ListField{})
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterField(graphql.String, "EventName", EventExtType, "name", func(p graphql.ResolveParams, ctx *ResolveContext, val reflect.Value)(interface{}, error) {
-    name := val.String()
-    return name, nil
-  })
-
-  err = context.RegisterField(graphql.String, "EventStateStart", EventExtType, "state_start", func(p graphql.ResolveParams, ctx *ResolveContext, val reflect.Value)(interface{}, error) {
-    state_start := val.Interface().(time.Time)
-    return state_start, nil
-  })
-
-  err = context.RegisterField(graphql.String, "EventState", EventExtType, "state", func(p graphql.ResolveParams, ctx *ResolveContext, val reflect.Value)(interface{}, error) {
-    state := val.String()
-    return state, nil
-  })
-
-  err = context.RegisterInterface("Event", "EventNode", []string{"Node"}, []string{"EventName", "EventStateStart", "EventState"}, map[string]SelfField{}, map[string]ListField{})
-  if err != nil {
-    panic(err)
-  }
-
-  sub_group_type := graphql.NewObject(graphql.ObjectConfig{
-    Name: "SubGroup",
-    Interfaces: nil,
-    Fields: graphql.Fields{
-      "Name": &graphql.Field{
-        Type: graphql.String,
-        Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-          val, ok := p.Source.(SubGroupGQL)
-          if ok == false {
-            return nil, fmt.Errorf("WRONG_TYPE_RETURNED")
-          }
-          return val.Name, nil
-        },
-      },
-      "Members": &graphql.Field{
-        Type: context.Interfaces["Node"].List,
-        Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-          ctx, err := PrepResolve(p)
-          if err != nil {
-            return nil, err
-          }
-
-          val, ok := p.Source.(SubGroupGQL)
-          if ok == false {
-            return nil, fmt.Errorf("WRONG_TYPE_RETURNED")
-          }
-
-          nodes, err := ResolveNodes(ctx, p, val.Members)
-          if err != nil {
-            return nil, err
-          }
-
-          return nodes, nil
-        },
-      },
-    },
-    IsTypeOf: func(p graphql.IsTypeOfParams) bool {
-      return reflect.TypeOf(p.Value) == reflect.TypeOf(SubGroupGQL{})
-    },
-    Description: "SubGroup within Group",
-  })
-  context.Types = append(context.Types, sub_group_type)
-
-  err = context.RegisterField(sub_group_type, "SubGroups", GroupExtType, "sub_groups",
-  func(p graphql.ResolveParams, ctx *ResolveContext, value reflect.Value)(interface{}, error) {
-    node_map, ok := value.Interface().(map[string]SubGroup)
-    if ok == false {
-      return nil, fmt.Errorf("value is %+v, not map[string]SubGroup", value.Type())
-    }
-
-    sub_groups := []SubGroupGQL{}
-    for name, sub_group := range(node_map) {
-      sub_groups = append(sub_groups, SubGroupGQL{
-        name,
-        sub_group.Members,
-      })
-    }
-
-    return sub_groups, nil
-  })
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterInterface("Group", "DefaultGroup", []string{"Node"}, []string{"SubGroups"}, map[string]SelfField{}, map[string]ListField{})
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterField(graphql.String, "LockableState", LockableExtType, "state",
-  func(p graphql.ResolveParams, ctx *ResolveContext, value reflect.Value)(interface{}, error) {
-    state, ok := value.Interface().(ReqState)
-    if ok == false {
-      return nil, fmt.Errorf("value is %+v, not ReqState", value.Type())
-    }
-
-    return ReqStateStrings[state], nil
-  })
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterInterface("Lockable", "DefaultLockable", []string{"Node"}, []string{"LockableState"}, map[string]SelfField{
-    "Owner": {
-      "owner",
-      LockableExtType,
-      func(p graphql.ResolveParams, ctx *ResolveContext, value reflect.Value) (*NodeID, error) {
-        id, ok := value.Interface().(*NodeID)
-        if ok == false {
-          return nil, fmt.Errorf("can't parse %+v as *NodeID", value.Type())
   }
 
-        return id, nil
-      },
-    },
-  }, map[string]ListField{
-    "Requirements": {
-      "requirements",
-      LockableExtType,
-      func(p graphql.ResolveParams, ctx *ResolveContext, value reflect.Value) ([]NodeID, error) {
-        id_strs, ok := value.Interface().(map[NodeID]ReqState)
-        if ok == false {
-          return nil, fmt.Errorf("can't parse requirements %+v as map[NodeID]ReqState", value.Type())
-        }
-
-        ids := []NodeID{}
-        for id := range(id_strs) {
-          ids = append(ids, id)
-        }
-        return ids, nil
-      },
-    },
-  })
-
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterField(graphql.String, "Listen", GQLExtType, "listen", func(p graphql.ResolveParams, ctx *ResolveContext, value reflect.Value) (interface{}, error) {
-    return value.String(), nil
-  })
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.RegisterNodeType(GQLNodeType, "GQLServer", []string{"Node", "Lockable", "Group"}, []string{"LockableState", "Listen", "Owner", "Requirements", "SubGroups"})
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.AddSignalMutation("stop", "node_id", reflect.TypeOf(StopSignal{}))
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.AddSignalMutation("addMember", "group_id", reflect.TypeOf(AddMemberSignal{}))
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.AddSignalMutation("removeMember", "group_id", reflect.TypeOf(RemoveMemberSignal{}))
-  if err != nil {
-    panic(err)
-  }
-
-  err = context.AddSignalMutation("eventControl", "event_id", reflect.TypeOf(EventControlSignal{}))
-  if err != nil {
-    panic(err)
-  }
-
-  context.Subscription.AddFieldConfig("Self", &graphql.Field{
-    Type: context.Interfaces["Node"].Interface,
-    Subscribe: func(p graphql.ResolveParams) (interface{}, error) {
-      ctx, err := PrepResolve(p)
-      if err != nil {
-        return nil, err
-      }
-
-      c, err := ctx.Ext.AddSubscription(ctx.ID)
-      if err != nil {
-        return nil, err
-      }
-
-      nodes, err := ResolveNodes(ctx, p, []NodeID{ctx.Server.ID})
-      if err != nil {
-        return nil, err
-      } else if len(nodes) != 1 {
-        return nil, fmt.Errorf("wrong length of nodes returned")
-      }
-
-      c <- nodes[0]
-
-      return c, nil
-    },
-    Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-      ctx, err := PrepResolve(p)
-      if err != nil {
-        return nil, err
-      }
-      ctx.Context.Log.Logf("gql_subscribe", "SUBSCRIBE_RESOLVE: %+v", p.Source)
-
-      switch source := p.Source.(type) {
-      case NodeResult:
-      case *StatusSignal:
-        delete(ctx.NodeCache, source.Source)
-        ctx.Context.Log.Logf("gql_subscribe", "Deleting %+v from NodeCache", source.Source)
-        if source.Source == ctx.Server.ID {
-          nodes, err := ResolveNodes(ctx, p, []NodeID{ctx.Server.ID})
-          if err != nil {
-            return nil, err
-          } else if len(nodes) != 1 {
-            return nil, fmt.Errorf("wrong length of nodes returned")
-          }
-          ctx.NodeCache[ctx.Server.ID] = nodes[0]
-        }
-      default:
-        return nil, fmt.Errorf("Don't know how to handle %+v", source)
-      }
-
-      return ctx.NodeCache[ctx.Server.ID], nil
-    },
-  })
-
-  context.Query.AddFieldConfig("Self", &graphql.Field{
-    Type: context.Interfaces["Node"].Interface,
-    Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-      ctx, err := PrepResolve(p)
-      if err != nil {
-        return nil, err
-      }
-
-      nodes, err := ResolveNodes(ctx, p, []NodeID{ctx.Server.ID})
-      if err != nil {
-        return nil, err
-      } else if len(nodes) != 1 {
-        return nil, fmt.Errorf("wrong length of resolved nodes returned")
-      }
-
-      return nodes[0], nil
-    },
-  })
-
-  context.Query.AddFieldConfig("Node", &graphql.Field{
-    Type: context.Interfaces["Node"].Interface,
-    Args: graphql.FieldConfigArgument{
-      "id": &graphql.ArgumentConfig{
-        Type: graphql.String,
-      },
-    },
-    Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-      ctx, err := PrepResolve(p)
-      if err != nil {
-        return nil, err
-      }
-
-      id, err := ExtractID(p, "id")
-      if err != nil {
-        return nil, err
-      }
-
-      nodes, err := ResolveNodes(ctx, p, []NodeID{id})
-      if err != nil {
-        return nil, err
-      } else if len(nodes) != 1 {
-        return nil, fmt.Errorf("wrong length of resolved nodes returned")
-      }
-
-      return nodes[0], nil
-    },
-  })
-
   schema, err := BuildSchema(&context)
   if err != nil {
     panic(err)
@@ -1599,6 +1212,21 @@ type GQLExt struct {
   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)
+  return ext.StartGQLServer(ctx, node)
+}
+
+func (ext *GQLExt) Unload(ctx *Context, node *Node) {
+  ctx.Log.Logf("gql", "Unloading GQL server extension on %s", node.ID)
+  err := ext.StopGQLServer()
+  if err != nil {
+    ctx.Log.Logf("gql", "Error unloading GQL server extension on %s: %s", node.ID, err)
+  } else {
+    ctx.Log.Logf("gql", "Unloaded GQL server extension on %s", node.ID)
+  }
+}
+
 func (ext *GQLExt) PostDeserialize(*Context) error {
   ext.resolver_response = map[uuid.UUID]chan Signal{}
   ext.subscriptions = []SubscriptionInfo{}
@@ -1713,23 +1341,6 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
       ctx.Log.Logf("gql", "Received read result that wasn't expected - %+v", sig)
     }
 
-  case *StopSignal:
-    ctx.Log.Logf("gql", "stopping gql server %s", node.ID)
-    err := ext.StopGQLServer()
-    if err != nil {
-      ctx.Log.Logf("gql", "GQL_STOP_ERROR: %s", err)
-    }
-
-  case *StartSignal:
-    ctx.Log.Logf("gql", "starting gql server %s", node.ID)
-    err := ext.StartGQLServer(ctx, node)
-    if err == nil {
-      ctx.Log.Logf("gql", "started gql server on %s", ext.Listen)
-      changes.Add(GQLExtType, "state")
-    } else {
-      ctx.Log.Logf("gql", "GQL_RESTART_ERROR: %s", err)
-    }
-
   case *StatusSignal:
     ext.subscriptions_lock.RLock()
     ctx.Log.Logf("gql", "forwarding status signal from %+v to resolvers %+v", sig.Source, ext.subscriptions)

gql_signal.go

@@ -8,35 +8,26 @@ import (
   "time"
 )
 
-type GQLTypeConverter func(*GQLExtContext, reflect.Type)(graphql.Type, error)
-type GQLValueConverter func(*GQLExtContext, interface{})(reflect.Value, error)
-type GQLTypeInfo struct {
-  Type GQLTypeConverter
-  Value GQLValueConverter
+type StructFieldInfo struct {
+  Name string
+  Type *TypeInfo
+  Index []int
 }
 
-func GetGQLTypeInfo(ctx *GQLExtContext, reflect_type reflect.Type) (*GQLTypeInfo, error) {
-  type_info, type_mapped := ctx.TypeMap[reflect_type]
-  if type_mapped == false {
-    kind_info, kind_mapped := ctx.KindMap[reflect_type.Kind()]
-    if kind_mapped == false {
-      return nil, fmt.Errorf("Signal has unsupported type/kind: %s/%s", reflect_type, reflect_type.Kind())
-    } else {
-      return &kind_info, nil
-    }
-  } else {
-    return &type_info, nil
+func ArgumentInfo(ctx *Context, field reflect.StructField, gv_tag string) (StructFieldInfo, error) {
+  type_info, mapped := ctx.TypeReflects[field.Type]
+  if mapped == false {
+    return StructFieldInfo{}, fmt.Errorf("field %+v is of unregistered type %+v ", field.Name, field.Type)
   }
-}
   
-type StructFieldInfo struct {
-  Name string
-  Type reflect.Type
-  GQL *GQLTypeInfo
-  Index []int
+  return StructFieldInfo{
+    Name: gv_tag,
+    Type: type_info,
+    Index: field.Index,
+  }, nil
 }
 
-func SignalFromArgs(ctx *GQLExtContext, signal_type reflect.Type, fields []StructFieldInfo, args map[string]interface{}, id_index, direction_index []int) (Signal, error) {
+func SignalFromArgs(ctx *Context, signal_type reflect.Type, fields []StructFieldInfo, args map[string]interface{}, id_index, direction_index []int) (Signal, error) {
   fmt.Printf("FIELD: %+v\n", fields)
   signal_value := reflect.New(signal_type)
 
@@ -52,10 +43,10 @@ func SignalFromArgs(ctx *GQLExtContext, signal_type reflect.Type, fields []Struc
       return nil, fmt.Errorf("No arg provided named %s", field.Name)
     }
     field_value := signal_value.Elem().FieldByIndex(field.Index)
-    if field_value.CanConvert(field.Type) == false {
-      return nil, fmt.Errorf("Arg %s wrong type %s/%s", field.Name, field_value.Type(), field.Type)
+    if field_value.CanConvert(field.Type.Reflect) == false {
+      return nil, fmt.Errorf("Arg %s wrong type %s/%s", field.Name, field_value.Type(), field.Type.Reflect)
     }
-    value, err := field.GQL.Value(ctx, arg)
+    value, err := field.Type.GQLValue(ctx, arg)
     if err != nil {
       return nil, err
     }
@@ -65,26 +56,7 @@ func SignalFromArgs(ctx *GQLExtContext, signal_type reflect.Type, fields []Struc
   return signal_value.Interface().(Signal), nil
 }
 
-func ArgumentInfo(ctx *GQLExtContext, field reflect.StructField, gv_tag string) (*graphql.ArgumentConfig, StructFieldInfo, error) {
-  gql_info, err := GetGQLTypeInfo(ctx, field.Type)
-  if err != nil {
-    return nil, StructFieldInfo{}, err
-  }
-  gql_type, err := gql_info.Type(ctx, field.Type)
-  if err != nil {
-    return nil, StructFieldInfo{}, err
-  }
-  return &graphql.ArgumentConfig{
-    Type: gql_type,
-  }, StructFieldInfo{
-    gv_tag,
-    field.Type,
-    gql_info,
-    field.Index,
-  }, nil
-}
-
-func (ext *GQLExtContext) AddSignalMutation(name string, send_id_key string, signal_type reflect.Type) error {
+func NewSignalMutation(ctx *Context, name string, send_id_key string, signal_type reflect.Type) (*graphql.Field, error) {
   args := graphql.FieldConfigArgument{}
   arg_info := []StructFieldInfo{}
   var id_index []int = nil
@@ -100,13 +72,14 @@ func (ext *GQLExtContext) AddSignalMutation(name string, send_id_key string, sig
       } else {
         _, exists := args[gv_tag]
         if exists == true {
-          return fmt.Errorf("Signal has repeated tag %s", gv_tag)
+          return nil, fmt.Errorf("Signal has repeated tag %s", gv_tag)
         } else {
-          config, info, err := ArgumentInfo(ext, field, gv_tag)
+          info, err := ArgumentInfo(ctx, field, gv_tag)
           if err != nil {
-            return err
+            return nil, err
+          }
+          args[gv_tag] = &graphql.ArgumentConfig{
           }
-          args[gv_tag] = config
           arg_info = append(arg_info, info)
         }
       }
@@ -131,7 +104,7 @@ func (ext *GQLExtContext) AddSignalMutation(name string, send_id_key string, sig
       return nil, err
     }
 
-    signal, err := SignalFromArgs(ctx.GQLContext, signal_type, arg_info, p.Args, id_index, direction_index)
+    signal, err := SignalFromArgs(ctx.Context, signal_type, arg_info, p.Args, id_index, direction_index)
     if err != nil {
       return nil, err
     }
@@ -164,10 +137,9 @@ func (ext *GQLExtContext) AddSignalMutation(name string, send_id_key string, sig
     return nil, fmt.Errorf("response of unhandled type %s", reflect.TypeOf(response))
   }
 
-  ext.Mutation.AddFieldConfig(name, &graphql.Field{
+  return &graphql.Field{
     Type: graphql.String,
     Args: args,
     Resolve: resolve_signal,
-  })
-  return nil
+  }, nil
 }

gql_test.go

@@ -1,6 +1,6 @@
 package graphvent
 
-import (
+/*import (
   "testing"
   "time"
   "fmt"
@@ -20,11 +20,11 @@ func TestGQLAuth(t *testing.T) {
   ctx := logTestContext(t, []string{"test"})
 
   listener_1 := NewListenerExt(10)
-  node_1, err := NewNode(ctx, nil, BaseNodeType, 10, nil, listener_1)
+  node_1, err := NewNode(ctx, nil, "Base", 10, nil, listener_1)
   fatalErr(t, err)
   
   listener_2 := NewListenerExt(10)
-  node_2, err := NewNode(ctx, nil, BaseNodeType, 10, nil, listener_2)
+  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))
@@ -43,48 +43,44 @@ func TestGQLAuth(t *testing.T) {
 }
 
 func TestGQLServer(t *testing.T) {
-  ctx := logTestContext(t, []string{"test", "deserialize_types", "serialize_types", "gqlws", "gql"})
-
-  TestNodeType := NewNodeType("TEST")
-  err := ctx.RegisterNodeType(TestNodeType, []ExtType{LockableExtType})
-  fatalErr(t, err)
+  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(ReadSignalType): Tree{
-      SerializedType(GroupExtType): Tree{
-        Hash(FieldNameBase, "members"): Tree{},
+    SerializedType(SignalTypeFor[ReadSignal]()): Tree{
+      SerializedType(ExtTypeFor[GroupExt]()): Tree{
+        SerializedType(GetFieldTag("members")): Tree{},
       },
     },
-    SerializedType(ReadResultSignalType): nil,
-    SerializedType(ErrorSignalType): nil,
+    SerializedType(SignalTypeFor[ReadResultSignal]()): nil,
+    SerializedType(SignalTypeFor[ErrorSignal]()): nil,
   })
 
   group_policy_2 := NewMemberOfPolicy(map[NodeID]map[string]Tree{
     gql_id: {
       "test_group": {
-        SerializedType(LinkSignalType): nil,
-        SerializedType(LockSignalType): nil,
-        SerializedType(StatusSignalType): nil,
-        SerializedType(ReadSignalType): nil,
+        SerializedType(SignalTypeFor[LinkSignal]()): nil,
+        SerializedType(SignalTypeFor[LockSignal]()): nil,
+        SerializedType(SignalTypeFor[StatusSignal]()): nil,
+        SerializedType(SignalTypeFor[ReadSignal]()): nil,
       },
     },
   })
 
   user_policy_1 := NewAllNodesPolicy(Tree{
-    SerializedType(ReadResultSignalType): nil,
-    SerializedType(ErrorSignalType): nil,
+    SerializedType(SignalTypeFor[ReadResultSignal]()): nil,
+    SerializedType(SignalTypeFor[ErrorSignal]()): nil,
   })
 
   user_policy_2 := NewMemberOfPolicy(map[NodeID]map[string]Tree{
     gql_id: {
       "test_group": {
-        SerializedType(LinkSignalType): nil,
-        SerializedType(ReadSignalType): nil,
-        SerializedType(LockSignalType): nil,
+        SerializedType(SignalTypeFor[LinkSignal]()): nil,
+        SerializedType(SignalTypeFor[ReadSignal]()): nil,
+        SerializedType(SignalTypeFor[LockSignal]()): nil,
       },
     },
   })
@@ -93,10 +89,10 @@ func TestGQLServer(t *testing.T) {
   fatalErr(t, err)
 
   listener_ext := NewListenerExt(10)
-  n1, err := NewNode(ctx, nil, TestNodeType, 10, []Policy{user_policy_2, user_policy_1}, NewLockableExt(nil))
+  n1, err := NewNode(ctx, nil, "Base", 10, []Policy{user_policy_2, user_policy_1}, NewLockableExt(nil))
   fatalErr(t, err)
 
-  gql, err := NewNode(ctx, gql_key, GQLNodeType, 10, []Policy{group_policy_2, group_policy_1},
+  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)
 
@@ -219,7 +215,7 @@ func TestGQLServer(t *testing.T) {
 
     msgs := Messages{}
     test_changes := Changes{}
-    test_changes.Add(GQLExtType, "state")
+    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)
@@ -246,10 +242,7 @@ func TestGQLServer(t *testing.T) {
 func TestGQLDB(t *testing.T) {
   ctx := logTestContext(t, []string{"test", "db", "node"})
 
-  TestUserNodeType := NewNodeType("TEST_USER")
-  err := ctx.RegisterNodeType(TestUserNodeType, []ExtType{})
-  fatalErr(t, err)
-  u1, err := NewNode(ctx, nil, TestUserNodeType, 10, nil)
+  u1, err := NewNode(ctx, nil, "Base", 10, nil)
   fatalErr(t, err)
 
   ctx.Log.Logf("test", "U1_ID: %s", u1.ID)
@@ -257,7 +250,7 @@ func TestGQLDB(t *testing.T) {
   gql_ext, err := NewGQLExt(ctx, ":0", nil, nil)
   fatalErr(t, err)
   listener_ext := NewListenerExt(10)
-  gql, err := NewNode(ctx, nil, GQLNodeType, 10, nil,
+  gql, err := NewNode(ctx, nil, "Base", 10, nil,
                  gql_ext,
                  listener_ext,
                  NewGroupExt(nil))
@@ -278,7 +271,7 @@ func TestGQLDB(t *testing.T) {
   gql_loaded, err := LoadNode(ctx, gql.ID)
   fatalErr(t, err)
 
-  listener_ext, err = GetExt[*ListenerExt](gql_loaded, ListenerExtType)
+  listener_ext, err = GetExt[ListenerExt](gql_loaded)
   fatalErr(t, err)
   msgs = Messages{}
   msgs = msgs.Add(ctx, gql_loaded.ID, gql_loaded, nil, NewStopSignal())
@@ -289,4 +282,4 @@ func TestGQLDB(t *testing.T) {
   })
   fatalErr(t, err)
 }
-
+*/

graph_test.go

@@ -6,13 +6,11 @@ import (
   badger "github.com/dgraph-io/badger/v3"
 )
 
-var SimpleListenerNodeType = NewNodeType("SIMPLE_LISTENER")
-
 func NewSimpleListener(ctx *Context, buffer int) (*Node, *ListenerExt, error) {
   listener_extension := NewListenerExt(buffer)
   listener, err := NewNode(ctx,
                       nil,
-                      SimpleListenerNodeType,
+                      "LockableListener",
                       10,
                       nil,
                       listener_extension,
@@ -30,7 +28,7 @@ func logTestContext(t * testing.T, components []string) *Context {
   ctx, err := NewContext(db, NewConsoleLogger(components))
   fatalErr(t, err)
 
-  err = ctx.RegisterNodeType(SimpleListenerNodeType, []ExtType{ListenerExtType, LockableExtType})
+  err = RegisterNodeType(ctx, "LockableListener", []ExtType{ExtTypeFor[ListenerExt](), ExtTypeFor[LockableExt]()}, map[string]FieldIndex{})
   fatalErr(t, err)
 
   return ctx

group.go

@@ -18,7 +18,7 @@ func NewAddSubGroupSignal(name string) *AddSubGroupSignal {
 
 func (signal AddSubGroupSignal) Permission() Tree {
   return Tree{
-    SerializedType(AddSubGroupSignalType): {
+    SerializedType(SignalTypeFor[AddSubGroupSignal]()): {
       Hash("name", signal.Name): nil,
     },
   }
@@ -38,7 +38,7 @@ func NewRemoveSubGroupSignal(name string) *RemoveSubGroupSignal {
 
 func (signal RemoveSubGroupSignal) Permission() Tree {
   return Tree{
-    SerializedType(RemoveSubGroupSignalType): {
+    SerializedType(SignalTypeFor[RemoveSubGroupSignal]()): {
       Hash("command", signal.Name): nil,
     },
   }
@@ -57,7 +57,7 @@ type SubGroupGQL struct {
 
 func (signal AddMemberSignal) Permission() Tree {
   return Tree{
-    SerializedType(AddMemberSignalType): {
+    SerializedType(SignalTypeFor[AddMemberSignal]()): {
       Hash("sub_group", signal.SubGroup): nil,
     },
   }
@@ -79,7 +79,7 @@ type RemoveMemberSignal struct {
 
 func (signal RemoveMemberSignal) Permission() Tree {
   return Tree{
-    SerializedType(RemoveMemberSignalType): {
+    SerializedType(SignalTypeFor[RemoveMemberSignal]()): {
       Hash("sub_group", signal.SubGroup): nil,
     },
   }
@@ -94,9 +94,9 @@ func NewRemoveMemberSignal(sub_group string, member_id NodeID) *RemoveMemberSign
 }
 
 var DefaultGroupPolicy = NewAllNodesPolicy(Tree{
-  SerializedType(ReadSignalType): {
-    SerializedType(GroupExtType): {
-      Hash(FieldNameBase, "sub_groups"): nil,
+  SerializedType(SignalTypeFor[ReadSignal]()): {
+    SerializedType(ExtTypeFor[GroupExt]()): {
+      SerializedType(GetFieldTag("sub_groups")): nil,
     },
   },
 })
@@ -125,7 +125,7 @@ func (policy MemberOfPolicy) ContinueAllows(ctx *Context, current PendingACL, si
   }
   ctx.Log.Logf("group", "member_of_read_result: %+v", sig.Extensions)
 
-  group_ext_data, ok := sig.Extensions[GroupExtType]
+  group_ext_data, ok := sig.Extensions[ExtTypeFor[GroupExt]()]
   if ok == false {
     return Deny
   }
@@ -178,7 +178,7 @@ func (policy MemberOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tr
   var messages Messages = nil
   for group_id, sub_groups := range(policy.Groups) {
     if group_id == node.ID {
-      ext, err := GetExt[*GroupExt](node, GroupExtType)
+      ext, err := GetExt[GroupExt](node)
       if err != nil {
         ctx.Log.Logf("group", "MemberOfPolicy with self ID error: %s", err)
       } else {
@@ -199,7 +199,7 @@ func (policy MemberOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tr
     } else {
       // Send the read request to the group so that ContinueAllows can parse the response to check membership
       messages = messages.Add(ctx, group_id, node, nil, NewReadSignal(map[ExtType][]string{
-        GroupExtType: {"sub_groups"},
+        ExtTypeFor[GroupExt](): {"sub_groups"},
       }))
     }
   }
@@ -223,6 +223,14 @@ func NewGroupExt(sub_groups map[string][]NodeID) *GroupExt {
   }
 }
 
+func (ext *GroupExt) Load(ctx *Context, node *Node) error {
+  return nil
+}
+
+func (ext *GroupExt) Unload(ctx *Context, node *Node) {
+
+}
+
 func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) (Messages, Changes) {
   var messages Messages = nil
   var changes = Changes{}
@@ -240,7 +248,7 @@ func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Sig
         ext.SubGroups[sig.SubGroup] = sub_group
 
         messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(sig.Id))
-        changes.Add(GroupExtType, "sub_groups")
+        changes.Add("sub_groups")
       }
     }
 
@@ -257,7 +265,7 @@ func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Sig
         ext.SubGroups[sig.SubGroup] = sub_group
 
         messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(sig.Id))
-        changes.Add(GroupExtType, "sub_groups")
+        changes.Add("sub_groups")
       }
     }
 
@@ -268,7 +276,7 @@ func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Sig
     } else {
       ext.SubGroups[sig.Name] = []NodeID{}
 
-      changes.Add(GroupExtType, "sub_groups")
+      changes.Add("sub_groups")
       messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(sig.Id))
     }
   case *RemoveSubGroupSignal:
@@ -278,7 +286,7 @@ func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Sig
     } else {
       delete(ext.SubGroups, sig.Name)
 
-      changes.Add(GroupExtType, "sub_groups")
+      changes.Add("sub_groups")
       messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(sig.Id))
     }
   }

group_test.go

@@ -9,7 +9,7 @@ func TestGroupAdd(t *testing.T) {
   ctx := logTestContext(t, []string{"listener", "test"})
 
   group_listener := NewListenerExt(10)
-  group, err := NewNode(ctx, nil, GroupNodeType, 10, nil, group_listener, NewGroupExt(nil))
+  group, err := NewNode(ctx, nil, "Base", 10, nil, group_listener, NewGroupExt(nil))
   fatalErr(t, err)
 
   add_subgroup_signal := NewAddSubGroupSignal("test_group")
@@ -41,7 +41,7 @@ func TestGroupAdd(t *testing.T) {
   }
 
   read_signal := NewReadSignal(map[ExtType][]string{
-    GroupExtType: {"sub_groups"},
+    ExtTypeFor[GroupExt](): {"sub_groups"},
   })
 
   messages = Messages{}
@@ -53,7 +53,7 @@ func TestGroupAdd(t *testing.T) {
 
   read_response := response.(*ReadResultSignal)
 
-  sub_groups_serialized := read_response.Extensions[GroupExtType]["sub_groups"]
+  sub_groups_serialized := read_response.Extensions[ExtTypeFor[GroupExt]()]["sub_groups"]
 
   sub_groups_type, remaining_types, err := DeserializeType(ctx, sub_groups_serialized.TypeStack)
   fatalErr(t, err)

listener.go

@@ -10,6 +10,13 @@ type ListenerExt struct {
   Chan chan Signal
 }
 
+func (ext *ListenerExt) Load(ctx *Context, node *Node) error {
+  return nil
+}
+
+func (ext *ListenerExt) Unload(ctx *Context, node *Node) {
+}
+
 func (ext *ListenerExt) PostDeserialize(ctx *Context) error {
   ext.Chan = make(chan Signal, ext.Buffer)
   return nil
@@ -23,10 +30,6 @@ func NewListenerExt(buffer int) *ListenerExt {
   }
 }
 
-func (listener *ListenerExt) Type() ExtType {
-  return ListenerExtType
-}
-
 // Send the signal to the channel, logging an overflow if it occurs
 func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) (Messages, Changes) {
   ctx.Log.Logf("listener", "%s - %+v", node.ID, reflect.TypeOf(signal))

lockable.go

@@ -6,13 +6,13 @@ import (
 )
 
 var AllowParentUnlockPolicy = NewOwnerOfPolicy(Tree{
-  SerializedType(LockSignalType): {
+  SerializedType(SignalTypeFor[LockSignal]()): {
     Hash(LockStateBase, "unlock"): nil,
   },
 })
 
 var AllowAnyLockPolicy = NewAllNodesPolicy(Tree{
-  SerializedType(LockSignalType): {
+  SerializedType(SignalTypeFor[LockSignal]()): {
     Hash(LockStateBase, "lock"): nil,
   },
 })
@@ -44,10 +44,6 @@ type LockableExt struct{
   WaitInfos WaitMap `gv:"wait_infos"`
 }
 
-func (ext *LockableExt) Type() ExtType {
-  return LockableExtType
-}
-
 func NewLockableExt(requirements []NodeID) *LockableExt {
   var reqs map[NodeID]ReqState = nil
   if requirements != nil {
@@ -79,15 +75,22 @@ func LockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
   return signal.ID(), ctx.Send(messages)
 }
 
+func (ext *LockableExt) Load(ctx *Context, node *Node) error {
+  return nil
+}
+
+func (ext *LockableExt) Unload(ctx *Context, node *Node) {
+}
+
 func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) (Messages, Changes) {
   var messages Messages = nil
-  var changes = Changes{}
+  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(LockableExtType, "wait_infos")
+      changes.Add("wait_infos")
       ctx.Log.Logf("lockable", "got mapped response %+v for %+v in state %s while in %s", signal, info, ReqStateStrings[state], ReqStateStrings[ext.State])
       switch ext.State {
       case AbortingLock:
@@ -100,11 +103,11 @@ func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeI
           }
         }
         if all_unlocked == true {
-          changes.Add(LockableExtType, "state")
+          changes.Add("state")
           ext.State = Unlocked
         }
       case Locking:
-        changes.Add(LockableExtType, "state")
+        changes.Add("state")
         ext.Requirements[info.Destination] = Unlocked
         unlocked := 0
         for _, state := range(ext.Requirements) {
@@ -164,7 +167,7 @@ func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID
           ext.Requirements = map[NodeID]ReqState{}
         }
         ext.Requirements[signal.NodeID] = Unlocked
-        changes.Add(LockableExtType, "requirements")
+        changes.Add("requirements")
         messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(signal.ID()))
       }
     case "remove":
@@ -173,7 +176,7 @@ func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID
         messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "can't link: not_requirement"))
       } else {
         delete(ext.Requirements, signal.NodeID)
-        changes.Add(LockableExtType, "requirements")
+        changes.Add("requirements")
         messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(signal.ID()))
       }
     default:
@@ -214,10 +217,10 @@ func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source Nod
             ctx.Log.Logf("lockable", "WHOLE LOCK: %s - %s - %+v", node.ID, ext.PendingID, ext.PendingOwner)
             ext.State = Locked
             ext.Owner = ext.PendingOwner
-            changes.Add(LockableExtType, "state", "owner", "requirements")
+            changes.Add("state", "owner", "requirements")
             messages = messages.Add(ctx, *ext.Owner, node, nil, NewSuccessSignal(ext.PendingID))
           } else {
-            changes.Add(LockableExtType, "requirements")
+            changes.Add("requirements")
             ctx.Log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, len(ext.Requirements))
           }
         case AbortingLock:
@@ -250,15 +253,15 @@ func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source Nod
             previous_owner := *ext.Owner
             ext.Owner = ext.PendingOwner
             ext.ReqID = nil
-            changes.Add(LockableExtType, "state", "owner", "req_id")
+            changes.Add("state", "owner", "req_id")
             messages = messages.Add(ctx, previous_owner, node, nil, NewSuccessSignal(ext.PendingID))
           } else if old_state == AbortingLock {
-            changes.Add(LockableExtType, "state", "pending_owner")
+            changes.Add("state", "pending_owner")
             messages = messages.Add(ctx, *ext.PendingOwner, node, nil, NewErrorSignal(*ext.ReqID, "not_unlocked"))
             ext.PendingOwner = ext.Owner
           }
         } else {
-          changes.Add(LockableExtType, "state")
+          changes.Add("state")
           ctx.Log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, len(ext.Requirements))
         }
       }
@@ -282,7 +285,7 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID
         new_owner := source
         ext.PendingOwner = &new_owner
         ext.Owner = &new_owner
-        changes.Add(LockableExtType, "state", "pending_owner", "owner")
+        changes.Add("state", "pending_owner", "owner")
         messages = messages.Add(ctx, new_owner, node, nil, NewSuccessSignal(signal.ID()))
       } else {
         ext.State = Locking
@@ -291,7 +294,7 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID
         new_owner := source
         ext.PendingOwner = &new_owner
         ext.PendingID = signal.ID()
-        changes.Add(LockableExtType, "state", "req_id", "pending_owner", "pending_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")
@@ -315,7 +318,7 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID
         new_owner := source
         ext.PendingOwner = nil
         ext.Owner = nil
-        changes.Add(LockableExtType, "state", "pending_owner", "owner")
+        changes.Add("state", "pending_owner", "owner")
         messages = messages.Add(ctx, new_owner, node, nil, NewSuccessSignal(signal.ID()))
       } else if source == *ext.Owner {
         ext.State = Unlocking
@@ -323,7 +326,7 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID
         ext.ReqID = &id
         ext.PendingOwner = nil
         ext.PendingID = signal.ID()
-        changes.Add(LockableExtType, "state", "pending_owner", "pending_id", "req_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")
@@ -351,7 +354,7 @@ func (ext *LockableExt) HandleTimeoutSignal(ctx *Context, node *Node, source Nod
 
   wait_info, found := node.ProcessResponse(ext.WaitInfos, signal)
   if found == true {
-    changes.Add(LockableExtType, "wait_infos")
+    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])
@@ -366,7 +369,7 @@ func (ext *LockableExt) HandleTimeoutSignal(ctx *Context, node *Node, source Nod
           }
         }
         if all_unlocked == true {
-          changes.Add(LockableExtType, "state")
+          changes.Add("state")
           ext.State = Unlocked
         }
       case Locking:
@@ -457,7 +460,7 @@ func (policy OwnerOfPolicy) ContinueAllows(ctx *Context, current PendingACL, sig
 }
 
 func (policy OwnerOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
-  l_ext, err := GetExt[*LockableExt](node, LockableExtType)
+  l_ext, err := GetExt[LockableExt](node)
   if err != nil {
     ctx.Log.Logf("lockable", "OwnerOfPolicy.Allows called on node without LockableExt")
     return nil, Deny
@@ -490,7 +493,7 @@ func (policy RequirementOfPolicy) ContinueAllows(ctx *Context, current PendingAC
     return Deny
   }
 
-  ext, ok := sig.Extensions[LockableExtType]
+  ext, ok := sig.Extensions[ExtTypeFor[LockableExt]()]
   if ok == false {
     return Deny
   }

lockable_test.go

@@ -7,11 +7,10 @@ import (
   "crypto/rand"
 )
 
-var TestLockableType = NewNodeType("TEST_LOCKABLE")
 func lockableTestContext(t *testing.T, logs []string) *Context {
   ctx := logTestContext(t, logs)
 
-  err := ctx.RegisterNodeType(TestLockableType, []ExtType{LockableExtType})
+  err := RegisterNodeType(ctx, "Lockable", []ExtType{ExtTypeFor[LockableExt]()}, map[string]FieldIndex{})
   fatalErr(t, err)
 
   return ctx
@@ -28,7 +27,7 @@ func TestLink(t *testing.T) {
   })
 
   l2_listener := NewListenerExt(10)
-  l2, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{policy},
+  l2, err := NewNode(ctx, nil, "Lockable", 10, []Policy{policy},
                   l2_listener,
                   NewLockableExt(nil),
                 )
@@ -36,7 +35,7 @@ func TestLink(t *testing.T) {
 
   l1_lockable := NewLockableExt(nil)
   l1_listener := NewListenerExt(10)
-  l1, err := NewNode(ctx, l1_key, TestLockableType, 10, nil,
+  l1, err := NewNode(ctx, l1_key, "Lockable", 10, nil,
                  l1_listener,
                  l1_lockable,
                )
@@ -68,7 +67,7 @@ func TestLink(t *testing.T) {
   fatalErr(t, err)
 }
 
-func Test100Lock(t *testing.T) {
+func Test1000Lock(t *testing.T) {
   ctx := lockableTestContext(t, []string{"test", "lockable"})
 
   l_pub, listener_key, err := ed25519.GenerateKey(rand.Reader)
@@ -76,30 +75,30 @@ func Test100Lock(t *testing.T) {
   listener_id := KeyID(l_pub)
   child_policy := NewPerNodePolicy(map[NodeID]Tree{
     listener_id: {
-      SerializedType(LockSignalType): nil,
+      SerializedType(SignalTypeFor[LockSignal]()): nil,
     },
   })
   NewLockable := func()(*Node) {
-    l, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{child_policy},
+    l, err := NewNode(ctx, nil, "Lockable", 10, []Policy{child_policy},
                   NewLockableExt(nil),
                 )
     fatalErr(t, err)
     return l
   }
 
-  reqs := make([]NodeID, 100)
+  reqs := make([]NodeID, 1000)
   for i := range(reqs) {
     new_lockable := NewLockable()
     reqs[i] = new_lockable.ID
   }
-  ctx.Log.Logf("test", "CREATED_100")
+  ctx.Log.Logf("test", "CREATED_1000")
 
   l_policy := NewAllNodesPolicy(Tree{
-    SerializedType(LockSignalType): nil,
+    SerializedType(SignalTypeFor[LockSignal]()): nil,
   })
 
   listener := NewListenerExt(5000)
-  node, err := NewNode(ctx, listener_key, TestLockableType, 5000, []Policy{l_policy},
+  node, err := NewNode(ctx, listener_key, "Lockable", 5000, []Policy{l_policy},
                 listener,
                 NewLockableExt(reqs),
               )
@@ -118,7 +117,7 @@ func Test100Lock(t *testing.T) {
     t.Fatalf("Unexpected response to lock - %s", resp)
   }
 
-  ctx.Log.Logf("test", "LOCKED_100")
+  ctx.Log.Logf("test", "LOCKED_1000")
 }
 
 func TestLock(t *testing.T) {
@@ -127,8 +126,8 @@ func TestLock(t *testing.T) {
   policy := NewAllNodesPolicy(nil)
 
   NewLockable := func(reqs []NodeID)(*Node, *ListenerExt) {
-    listener := NewListenerExt(100)
-    l, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{policy},
+    listener := NewListenerExt(1000)
+    l, err := NewNode(ctx, nil, "Lockable", 10, []Policy{policy},
                   listener,
                   NewLockableExt(reqs),
                 )

node.go

@@ -47,22 +47,6 @@ func RandID() NodeID {
   return NodeID(uuid.New())
 }
 
-type Changes map[ExtType][]string
-
-func (changes Changes) Add(ext ExtType, fields ...string) {
-  current, exists := changes[ext]
-  if exists == false {
-    current = []string{}
-  }
-  current = append(current, fields...)
-  changes[ext] = current
-}
-
-// Extensions are data attached to nodes that process signals
-type Extension interface {
-  Process(*Context, *Node, NodeID, Signal) (Messages, Changes)
-}
-
 // A QueuedSignal is a Signal that has been Queued to trigger at a set time
 type QueuedSignal struct {
   Signal `gv:"signal"`
@@ -265,6 +249,7 @@ func (err StringError) Error() string {
 func (err StringError) MarshalBinary() ([]byte, error) {
   return []byte(string(err)), nil
 }
+
 func NewErrorField(fstring string, args ...interface{}) SerializedValue {
   str := StringError(fmt.Sprintf(fstring, args...))
   str_ser, err := str.MarshalBinary()
@@ -272,12 +257,13 @@ func NewErrorField(fstring string, args ...interface{}) SerializedValue {
     panic(err)
   }
   return SerializedValue{
-    TypeStack: []SerializedType{ErrorType},
+    TypeStack: []SerializedType{SerializedTypeFor[error]()},
     Data: str_ser,
   }
 }
 
 func (node *Node) ReadFields(ctx *Context, reqs map[ExtType][]string)map[ExtType]map[string]SerializedValue {
+  ctx.Log.Logf("read_field", "Reading %+v on %+v", reqs, node.ID)
   exts := map[ExtType]map[string]SerializedValue{}
   for ext_type, field_reqs := range(reqs) {
     fields := map[string]SerializedValue{}
@@ -306,8 +292,14 @@ func nodeLoop(ctx *Context, node *Node) error {
     return fmt.Errorf("%s is already started, will not start again", node.ID)
   }
 
-  // Perform startup actions
-  node.Process(ctx, ZeroID, NewStartSignal())
+  // Load each extension before starting the main loop
+  for _, extension := range(node.Extensions) {
+    err := extension.Load(ctx, node)
+    if err != nil {
+      return err
+    }
+  }
+
   run := true
   for run == true {
     var signal Signal
@@ -490,17 +482,6 @@ func nodeLoop(ctx *Context, node *Node) error {
     }
 
     switch sig := signal.(type) {
-    case *StopSignal:
-      node.Process(ctx, source, signal)
-      if source == node.ID {
-        node.Process(ctx, source, NewStoppedSignal(sig, node.ID))
-      } else {
-        msgs := Messages{}
-        msgs = msgs.Add(ctx, node.ID, node, nil, NewStoppedSignal(sig, node.ID))
-        ctx.Send(msgs)
-      }
-      run = false
-
     case *ReadSignal:
       result := node.ReadFields(ctx, sig.Extensions)
       msgs := Messages{}
@@ -523,20 +504,18 @@ func nodeLoop(ctx *Context, node *Node) error {
   return nil
 }
 
-func (node *Node) Stop(ctx *Context) error {
+func (node *Node) Unload(ctx *Context) error {
   if node.Active.Load() {
-    msg, err := NewMessage(ctx, node.ID, node, nil, NewStopSignal())
-    if err != nil {
-      return err
+    for _, extension := range(node.Extensions) {
+      extension.Unload(ctx, node)
     }
-    node.MsgChan <- msg
     return nil
   } else {
     return fmt.Errorf("Node not active")
   }
 }
 
-func (node *Node) QueueChanges(ctx *Context, changes Changes) error {
+func (node *Node) QueueChanges(ctx *Context, changes map[ExtType]Changes) error {
   node.QueueSignal(time.Now(), NewStatusSignal(node.ID, changes))
   return nil
 }
@@ -544,18 +523,15 @@ func (node *Node) QueueChanges(ctx *Context, changes Changes) error {
 func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
   ctx.Log.Logf("node_process", "PROCESSING MESSAGE: %s - %+v", node.ID, signal)
   messages := Messages{}
-  changes := Changes{}
+  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...)
     }
-
     if len(ext_changes) != 0 {
-      for ext, change_list := range(ext_changes) {
-        changes[ext] = append(changes[ext], change_list...)
-      }
+      changes[ext_type] = ext_changes
     }
   }
   ctx.Log.Logf("changes", "Changes for %s after %+v - %+v", node.ID, reflect.TypeOf(signal), changes)
@@ -568,8 +544,6 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
   }
 
   if len(changes) != 0 {
-    _, ok := signal.(*StoppedSignal)
-    if (ok == false) || (source != node.ID) {
     write_err := WriteNodeChanges(ctx, node, changes)
     if write_err != nil {
       return write_err
@@ -580,13 +554,13 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
       return status_err
     }
   }
-  }
 
   return nil
 }
 
-func GetCtx[C any](ctx *Context, ext_type ExtType) (C, error) {
+func GetCtx[C any, E any, T interface { *E; Extension}](ctx *Context) (C, error) {
   var zero_ctx C
+  ext_type := ExtType(SerializedTypeFor[E]())
   ext_info, ok := ctx.Extensions[ext_type]
   if ok == false {
     return zero_ctx, fmt.Errorf("%+v is not an extension in ctx", ext_type)
@@ -600,8 +574,9 @@ func GetCtx[C any](ctx *Context, ext_type ExtType) (C, error) {
   return ext_ctx, nil
 }
 
-func GetExt[T Extension](node *Node, ext_type ExtType) (T, error) {
+func GetExt[E any, T interface { *E; Extension}](node *Node) (T, error) {
   var zero T
+  ext_type := ExtType(SerializedTypeFor[E]())
   ext, exists := node.Extensions[ext_type]
   if exists == false {
     return zero, fmt.Errorf("%+v does not have %+v extension - %+v", node.ID, ext_type, node.Extensions)
@@ -621,7 +596,12 @@ func KeyID(pub ed25519.PublicKey) NodeID {
 }
 
 // Create a new node in memory and start it's event loop
-func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_size uint32, policies []Policy, extensions ...Extension) (*Node, error) {
+func NewNode(ctx *Context, key ed25519.PrivateKey, type_name string, buffer_size uint32, policies []Policy, 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 {
@@ -643,7 +623,6 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
     return nil, fmt.Errorf("Node type %+v not registered in Context", node_type)
   }
 
-  changes := Changes{}
   ext_map := map[ExtType]Extension{}
   for _, ext := range(extensions) {
     ext_type, exists := ctx.ExtensionTypes[reflect.TypeOf(ext)]
@@ -655,7 +634,6 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
       return nil, fmt.Errorf("Cannot add the same extension to a node twice")
     }
     ext_map[ext_type] = ext
-    changes.Add(ext_type, "init")
   }
 
   for _, required_ext := range(def.Extensions) {
@@ -686,18 +664,12 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
   }
 
   node.writeSignalQueue = true
-  err = WriteNodeChanges(ctx, node, changes)
+  err = WriteNodeInit(ctx, node)
   if err != nil {
     return nil, err
   }
 
   ctx.AddNode(id, node)
-
-  err = node.Process(ctx, ZeroID, NewCreateSignal())
-  if err != nil {
-    return nil, err
-  }
-
   go runNode(ctx, node)
 
   return node, nil
@@ -720,6 +692,8 @@ func WriteNodeExtList(ctx *Context, node *Node) error {
     i += 1
   }
 
+  ctx.Log.Logf("db", "Writing ext_list for %s - %+v", node.ID, ext_list)
+
   id_bytes, err := node.ID.MarshalBinary()
   if err != nil {
     return err
@@ -735,7 +709,54 @@ func WriteNodeExtList(ctx *Context, node *Node) error {
   })
 }
 
-func WriteNodeChanges(ctx *Context, node *Node, changes Changes) error {
+func WriteNodeInit(ctx *Context, node *Node) error {
+  ctx.Log.Logf("db", "Writing initial entry for %s - %+v", node.ID, node)
+
+  ext_serialized := map[ExtType]SerializedValue{}
+  for ext_type, ext := range(node.Extensions) {
+    serialized_ext, err := SerializeAny(ctx, ext)
+    if err != nil {
+      return err
+    }
+    ext_serialized[ext_type] = serialized_ext
+  }
+
+  sq_serialized, err := SerializeAny(ctx, node.SignalQueue)
+  if err != nil {
+    return err
+  }
+
+  node_serialized, err := SerializeAny(ctx, node)
+  if err != nil {
+    return err
+  }
+
+  id_bytes, err := node.ID.MarshalBinary()
+
+  return ctx.DB.Update(func(txn *badger.Txn) error {
+    err := txn.Set(id_bytes, node_serialized.Data)
+    if err != nil {
+      return nil
+    }
+
+    err = txn.Set(append(id_bytes, signal_queue_suffix...), sq_serialized.Data)
+    if err != nil {
+      return err
+    }
+
+    for ext_type, data := range(ext_serialized) {
+      err := txn.Set(append(id_bytes, ExtTypeSuffix(ext_type)...), data.Data)
+      if err != nil {
+        return err
+      }
+    }
+
+    return nil
+  })
+
+}
+
+func WriteNodeChanges(ctx *Context, node *Node, changes map[ExtType]Changes) error {
   ctx.Log.Logf("db", "Writing changes for %s - %+v", node.ID, changes)
 
   ext_serialized := map[ExtType]SerializedValue{}
@@ -894,7 +915,7 @@ func LoadNode(ctx *Context, id NodeID) (*Node, error) {
       return nil, fmt.Errorf("0x%0x is not a known extension type", ext_type)
     }
 
-    ext_value, remaining, err := DeserializeValue(ctx, ext_info.Type, data)
+    ext_value, remaining, err := DeserializeValue(ctx, ext_info.Reflect, data)
     if err != nil {
       return nil, err
     } else if len(remaining) > 0 {

node_test.go

@@ -9,31 +9,21 @@ import (
 )
 
 func TestNodeDB(t *testing.T) {
-  ctx := logTestContext(t, []string{"signal", "serialize", "node", "db", "listener"})
-  node_type := NewNodeType("test")
-  err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType})
-  fatalErr(t, err)
+  ctx := logTestContext(t, []string{"node", "db"})
 
   node_listener := NewListenerExt(10)
-  node, err := NewNode(ctx, nil, node_type, 10, nil, NewGroupExt(nil), NewLockableExt(nil), node_listener)
+  node, err := NewNode(ctx, nil, "Base", 10, nil, NewGroupExt(nil), NewLockableExt(nil), node_listener)
   fatalErr(t, err)
 
   _, err = WaitForSignal(node_listener.Chan, 10*time.Millisecond, func(sig *StatusSignal) bool {
-    gql_changes, has_gql := sig.Changes[GQLExtType]
+    gql_changes, has_gql := sig.Changes[ExtTypeFor[GQLExt]()]
     if has_gql == true {
       return slices.Contains(gql_changes, "state") && sig.Source == node.ID
     }
     return false
   })
 
-  msgs := Messages{}
-  msgs = msgs.Add(ctx, node.ID, node, nil, NewStopSignal())
-  err = ctx.Send(msgs)
-  fatalErr(t, err)
-
-  _, err = WaitForSignal(node_listener.Chan, 10*time.Millisecond, func(sig *StoppedSignal) bool {
-    return sig.Source == node.ID
-  })
+  err = ctx.Unload(node.ID)
   fatalErr(t, err)
 
   ctx.nodeMap = map[NodeID]*Node{}
@@ -43,9 +33,6 @@ func TestNodeDB(t *testing.T) {
 
 func TestNodeRead(t *testing.T) {
   ctx := logTestContext(t, []string{"test"})
-  node_type := NewNodeType("TEST")
-  err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType})
-  fatalErr(t, err)
 
   n1_pub, n1_key, err := ed25519.GenerateKey(rand.Reader)
   fatalErr(t, err)
@@ -60,19 +47,19 @@ func TestNodeRead(t *testing.T) {
 
   n1_policy := NewPerNodePolicy(map[NodeID]Tree{
     n2_id: {
-      SerializedType(ReadSignalType): nil,
+      SerializedType(SignalTypeFor[ReadSignal]()): nil,
     },
   })
 
   n2_listener := NewListenerExt(10)
-  n2, err := NewNode(ctx, n2_key, node_type, 10, nil, NewGroupExt(nil), n2_listener)
+  n2, err := NewNode(ctx, n2_key, "Base", 10, nil, NewGroupExt(nil), n2_listener)
   fatalErr(t, err)
 
-  n1, err := NewNode(ctx, n1_key, node_type, 10, []Policy{n1_policy}, NewGroupExt(nil))
+  n1, err := NewNode(ctx, n1_key, "Base", 10, []Policy{n1_policy}, NewGroupExt(nil))
   fatalErr(t, err)
 
   read_sig := NewReadSignal(map[ExtType][]string{
-    GroupExtType: {"members"},
+    ExtTypeFor[GroupExt](): {"members"},
   })
   msgs := Messages{}
   msgs = msgs.Add(ctx, n1.ID, n2, nil, read_sig)

policy.go

@@ -134,6 +134,6 @@ type AllNodesPolicy struct {
 }
 
 var DefaultPolicy = NewAllNodesPolicy(Tree{
-  ResponseType: nil,
-  StatusType: nil,
+  SerializedType(SignalTypeFor[ResponseSignal]()): nil,
+  SerializedType(SignalTypeFor[StatusSignal]()): nil,
 })

serialize.go

@@ -1,6 +1,7 @@
 package graphvent
 
 import (
+	"bytes"
 	"crypto/sha512"
 	"encoding"
 	"encoding/binary"
@@ -8,27 +9,10 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+	"slices"
 	"sort"
-  "bytes"
-)
-
-const (
-  TagBase            = "GraphventTag"
-  ExtTypeBase        = "ExtType"
-  NodeTypeBase       = "NodeType"
-  SignalTypeBase     = "SignalType"
-  PolicyTypeBase     = "PolicyType"
-  SerializedTypeBase = "SerializedType"
-  FieldNameBase      = "FieldName"
 )
 
-func Hash(base string, name string) SerializedType {
-  digest := append([]byte(base), 0x00)
-  digest = append(digest, []byte(name)...)
-  hash := sha512.Sum512(digest)
-  return SerializedType(binary.BigEndian.Uint64(hash[0:8]))
-}
-
 type SerializedType uint64
 
 func (t SerializedType) String() string {
@@ -180,119 +164,69 @@ type SerializeFn func(*Context, reflect.Value) (Chunks, error)
 type TypeDeserializeFn func(*Context, []SerializedType) (reflect.Type, []SerializedType, error)
 type DeserializeFn func(*Context, reflect.Type, []byte) (reflect.Value, []byte, error)
 
-func NewExtType(name string) ExtType {
-  return ExtType(Hash(ExtTypeBase, name))
-}
-
-func NewNodeType(name string) NodeType {
-  return NodeType(Hash(NodeTypeBase, name))
-}
-
-func NewSignalType(name string) SignalType {
-  return SignalType(Hash(SignalTypeBase, name))
-}
-
-func NewPolicyType(name string) PolicyType {
-  return PolicyType(Hash(PolicyTypeBase, name))
-}
-
-func NewFieldTag(tag_string string) FieldTag {
-  return FieldTag(Hash(FieldNameBase, tag_string))
-}
-
-func NewSerializedType(name string) SerializedType {
-  return Hash(SerializedTypeBase, name)
-}
-
-var (
-  ListenerExtType = NewExtType("LISTENER")
-  LockableExtType = NewExtType("LOCKABLE")
-  GQLExtType      = NewExtType("GQL")
-  GroupExtType    = NewExtType("GROUP")
-  ACLExtType      = NewExtType("ACL")
-  EventExtType    = NewExtType("EVENT")
-
-  GQLNodeType   = NewNodeType("GQL")
-  BaseNodeType  = NewNodeType("BASE")
-  GroupNodeType = NewNodeType("GROUP")
-
-  StopSignalType           = NewSignalType("STOP")
-  CreateSignalType         = NewSignalType("CREATE")
-  StartSignalType          = NewSignalType("START")
-  StatusSignalType         = NewSignalType("STATUS")
-  LinkSignalType           = NewSignalType("LINK")
-  LockSignalType           = NewSignalType("LOCK")
-  TimeoutSignalType        = NewSignalType("TIMEOUT")
-  ReadSignalType           = NewSignalType("READ")
-  ACLTimeoutSignalType     = NewSignalType("ACL_TIMEOUT")
-  ErrorSignalType          = NewSignalType("ERROR")
-  SuccessSignalType        = NewSignalType("SUCCESS")
-  ReadResultSignalType     = NewSignalType("READ_RESULT")
-  RemoveMemberSignalType   = NewSignalType("REMOVE_MEMBER")
-  AddMemberSignalType      = NewSignalType("ADD_MEMBER")
-  ACLSignalType            = NewSignalType("ACL")
-  AddSubGroupSignalType    = NewSignalType("ADD_SUBGROUP")
-  RemoveSubGroupSignalType = NewSignalType("REMOVE_SUBGROUP")
-  StoppedSignalType        = NewSignalType("STOPPED")
-  EventControlSignalType   = NewSignalType("EVENT_CONTORL")
-  EventStateSignalType     = NewSignalType("VEX_MATCH_STATUS")
-
-  MemberOfPolicyType      = NewPolicyType("MEMBER_OF")
-  OwnerOfPolicyType       = NewPolicyType("OWNER_OF")
-  ParentOfPolicyType      = NewPolicyType("PARENT_OF")
-  RequirementOfPolicyType = NewPolicyType("REQUIEMENT_OF")
-  PerNodePolicyType       = NewPolicyType("PER_NODE")
-  AllNodesPolicyType      = NewPolicyType("ALL_NODES")
-  ACLProxyPolicyType      = NewPolicyType("ACL_PROXY")
-
-  ErrorType     = NewSerializedType("ERROR")
-  PointerType   = NewSerializedType("POINTER")
-  SliceType     = NewSerializedType("SLICE")
-  StructType    = NewSerializedType("STRUCT")
-  IntType       = NewSerializedType("INT")
-  UIntType      = NewSerializedType("UINT")
-  BoolType      = NewSerializedType("BOOL")
-  Float64Type   = NewSerializedType("FLOAT64")
-  Float32Type   = NewSerializedType("FLOAT32")
-  UInt8Type     = NewSerializedType("UINT8")
-  UInt16Type    = NewSerializedType("UINT16")
-  UInt32Type    = NewSerializedType("UINT32")
-  UInt64Type    = NewSerializedType("UINT64")
-  Int8Type      = NewSerializedType("INT8")
-  Int16Type     = NewSerializedType("INT16")
-  Int32Type     = NewSerializedType("INT32")
-  Int64Type     = NewSerializedType("INT64")
-  StringType    = NewSerializedType("STRING")
-  ArrayType     = NewSerializedType("ARRAY")
-  InterfaceType = NewSerializedType("INTERFACE")
-  MapType       = NewSerializedType("MAP")
-
-  EventStateType       = NewSerializedType("EVENT_STATE")
-  WaitReasonType       = NewSerializedType("WAIT_REASON")
-  EventCommandType     = NewSerializedType("EVENT_COMMAND")
-  ReqStateType         = NewSerializedType("REQ_STATE")
-  WaitInfoType         = NewSerializedType("WAIT_INFO")
-  SignalDirectionType  = NewSerializedType("SIGNAL_DIRECTION")
-  NodeStructType       = NewSerializedType("NODE_STRUCT")
-  QueuedSignalType     = NewSerializedType("QUEUED_SIGNAL")
-  NodeTypeSerialized   = NewSerializedType("NODE_TYPE")
-  ChangesSerialized    = NewSerializedType("CHANGES")
-  ExtTypeSerialized    = NewSerializedType("EXT_TYPE")
-  PolicyTypeSerialized = NewSerializedType("POLICY_TYPE")
-  ExtSerialized        = NewSerializedType("EXTENSION")
-  PolicySerialized     = NewSerializedType("POLICY")
-  SignalSerialized     = NewSerializedType("SIGNAL")
-  NodeIDType           = NewSerializedType("NODE_ID")
-  UUIDType             = NewSerializedType("UUID")
-  PendingACLType       = NewSerializedType("PENDING_ACL")
-  PendingACLSignalType = NewSerializedType("PENDING_ACL_SIGNAL")
-  TimeType             = NewSerializedType("TIME")
-  DurationType         = NewSerializedType("DURATION")
-  ResponseType         = NewSerializedType("RESPONSE")
-  StatusType           = NewSerializedType("STATUS")
-  TreeType             = NewSerializedType("TREE")
-  SerializedTypeSerialized   = NewSerializedType("SERIALIZED_TYPE")
-)
+
+func NodeTypeFor(name string, extensions []ExtType, mappings map[string]FieldIndex) NodeType {
+  digest := []byte("GRAPHVENT_NODE[" + name + "] - ")
+  for _, ext := range(extensions) {
+    digest = binary.BigEndian.AppendUint64(digest, uint64(ext))
+  }
+
+  digest = binary.BigEndian.AppendUint64(digest, 0)
+
+  sorted_keys := make([]string, len(mappings))
+  i := 0
+  for key := range(mappings) {
+    sorted_keys[i] = key
+    i += 1
+  }
+  slices.Sort(sorted_keys)
+
+
+
+  for _, key := range(sorted_keys) {
+    digest = append(digest, []byte(key + ":")...)
+    digest = binary.BigEndian.AppendUint64(digest, uint64(mappings[key].Extension))
+    digest = append(digest, []byte(mappings[key].Field + "|")...)
+  }
+
+  hash := sha512.Sum512(digest)
+  return NodeType(binary.BigEndian.Uint64(hash[0:8]))
+}
+
+func SerializedKindFor(kind reflect.Kind) SerializedType {
+  digest := []byte("GRAPHVENT_KIND - " + kind.String())
+  hash := sha512.Sum512(digest)
+  return SerializedType(binary.BigEndian.Uint64(hash[0:8]))
+}
+
+func SerializedTypeFor[T any]() SerializedType {
+  t := reflect.TypeFor[T]()
+  digest := []byte(t.PkgPath() + ":" + t.Name())
+  hash := sha512.Sum512(digest)
+  return SerializedType(binary.BigEndian.Uint64(hash[0:8]))
+}
+
+func ExtTypeFor[E any, T interface { *E; Extension}]() ExtType {
+  return ExtType(SerializedTypeFor[E]())
+}
+
+func SignalTypeFor[S Signal]() SignalType {
+  return SignalType(SerializedTypeFor[S]())
+}
+
+func PolicyTypeFor[P Policy]() PolicyType {
+  return PolicyType(SerializedTypeFor[P]())
+}
+
+func Hash(base, data string) SerializedType { 
+  digest := []byte(base + ":" + data)
+  hash := sha512.Sum512(digest)
+  return SerializedType(binary.BigEndian.Uint64(hash[0:8]))
+}
+
+func GetFieldTag(tag string) FieldTag {
+  return FieldTag(Hash("GRAPHVENT_FIELD_TAG", tag))
+}
 
 type FieldInfo struct {
   Index     []int
@@ -302,8 +236,8 @@ type FieldInfo struct {
 
 type StructInfo struct {
   Type               reflect.Type
-  FieldOrder         []SerializedType
-  FieldMap           map[SerializedType]FieldInfo
+  FieldOrder         []FieldTag
+  FieldMap           map[FieldTag]FieldInfo
   PostDeserialize    bool
   PostDeserializeIdx int
 }
@@ -316,15 +250,15 @@ var deserializable_zero Deserializable = nil
 var DeserializableType = reflect.TypeOf(&deserializable_zero).Elem()
 
 func GetStructInfo(ctx *Context, struct_type reflect.Type) (StructInfo, error) {
-  field_order := []SerializedType{}
-  field_map := map[SerializedType]FieldInfo{}
+  field_order := []FieldTag{}
+  field_map := map[FieldTag]FieldInfo{}
   for _, field := range reflect.VisibleFields(struct_type) {
     gv_tag, tagged_gv := field.Tag.Lookup("gv")
     if tagged_gv == false {
       continue
     } else {
-      field_hash := Hash(FieldNameBase, gv_tag)
-      _, exists := field_map[field_hash]
+      field_tag := GetFieldTag(gv_tag)
+      _, exists := field_map[field_tag]
       if exists == true {
         return StructInfo{}, fmt.Errorf("gv tag %s is repeated", gv_tag)
       } else {
@@ -332,12 +266,12 @@ func GetStructInfo(ctx *Context, struct_type reflect.Type) (StructInfo, error) {
         if err != nil {
           return StructInfo{}, err
         }
-        field_map[field_hash] = FieldInfo{
+        field_map[field_tag] = FieldInfo{
           field.Index,
           field_type_stack,
           field.Type,
         }
-        field_order = append(field_order, field_hash)
+        field_order = append(field_order, field_tag)
       }
     }
   }
@@ -408,10 +342,10 @@ func DeserializeStruct(info StructInfo)func(*Context, reflect.Type, []byte)(refl
     for i := uint64(0); i < num_fields; i ++ {
       field_hash_bytes := data[:8]
       data = data[8:]
-      field_hash := SerializedType(binary.BigEndian.Uint64(field_hash_bytes))
-      field_info, exists := info.FieldMap[field_hash]
+      field_tag := FieldTag(binary.BigEndian.Uint64(field_hash_bytes))
+      field_info, exists := info.FieldMap[field_tag]
       if exists == false {
-        return reflect.Value{}, nil, fmt.Errorf("%+v is not a field in %+v", field_hash, info.Type)
+        return reflect.Value{}, nil, fmt.Errorf("%+v is not a field in %+v", field_tag, info.Type)
       }
 
       var field_value reflect.Value

serialize_test.go

@@ -1,9 +1,9 @@
 package graphvent
 
 import (
-  "testing"
-  "reflect"
 	"fmt"
+	"reflect"
+	"testing"
 	"time"
 )
 
@@ -17,11 +17,11 @@ func TestSerializeTest(t *testing.T) {
 }
 
 func TestSerializeBasic(t *testing.T) {
-  ctx := logTestContext(t, []string{"test", "serialize"})
+  ctx := logTestContext(t, []string{"test", "serialize", "deserialize_types"})
   testSerializeComparable[bool](t, ctx, true)
 
   type bool_wrapped bool
-  err := ctx.RegisterType(reflect.TypeOf(bool_wrapped(true)), NewSerializedType("BOOL_WRAPPED"), nil, nil, nil, DeserializeBool[bool_wrapped])
+  err := RegisterType[bool_wrapped](ctx, nil, nil, nil, DeserializeBool[bool_wrapped])
   fatalErr(t, err)
   testSerializeComparable[bool_wrapped](t, ctx, true)
 
@@ -55,9 +55,9 @@ func TestSerializeBasic(t *testing.T) {
   })
 
   testSerialize(t, ctx, Tree{
-    NodeTypeSerialized: nil,
-    SerializedTypeSerialized: Tree{
-      NodeTypeSerialized: Tree{},
+    SerializedTypeFor[NodeType](): nil,
+    SerializedTypeFor[SerializedType](): {
+      SerializedTypeFor[NodeType](): Tree{},
     },
   })
 
@@ -83,11 +83,7 @@ func TestSerializeBasic(t *testing.T) {
     String string `gv:"string"`
   }
 
-  test_struct_type := reflect.TypeOf(test_struct{})
-  test_struct_info, err := GetStructInfo(ctx, test_struct_type)
-  fatalErr(t, err)
-
-  err = ctx.RegisterType(test_struct_type, NewSerializedType("TEST_STRUCT"), nil, SerializeStruct(test_struct_info), nil, DeserializeStruct(test_struct_info))
+  err = RegisterStruct[test_struct](ctx)
   fatalErr(t, err)
 
   testSerialize(t, ctx, test_struct{
@@ -96,25 +92,24 @@ func TestSerializeBasic(t *testing.T) {
   })
 
   testSerialize(t, ctx, Tree{
-    MapType: nil,
-    StringType: nil,
+    SerializedKindFor(reflect.Map): nil,
+    SerializedKindFor(reflect.String): nil,
   })
 
   testSerialize(t, ctx, Tree{
-    TreeType: nil,
+    SerializedTypeFor[Tree](): nil,
   })
 
   testSerialize(t, ctx, Tree{
-    TreeType: {
-      ErrorType: Tree{},
-      MapType: nil,
+    SerializedTypeFor[Tree](): {
+      SerializedTypeFor[error](): Tree{},
+      SerializedKindFor(reflect.Map): nil,
     },
-    StringType: nil,
+    SerializedKindFor(reflect.String): nil,
   })
 
   type test_slice []string
-  test_slice_type := reflect.TypeOf(test_slice{})
-  err = ctx.RegisterType(test_slice_type, NewSerializedType("TEST_SLICE"), SerializeTypeStub, SerializeSlice, DeserializeTypeStub[test_slice], DeserializeSlice)
+  err = RegisterType[test_slice](ctx, SerializeTypeStub, SerializeSlice, DeserializeTypeStub[test_slice], DeserializeSlice)
   fatalErr(t, err)
 
   testSerialize[[]string](t, ctx, []string{"test_1", "test_2", "test_3"})
@@ -133,12 +128,8 @@ func (s test) String() string {
 func TestSerializeStructTags(t *testing.T) {
   ctx := logTestContext(t, []string{"test"})
 
-  test_type := NewSerializedType("TEST_STRUCT")
-  test_struct_type := reflect.TypeOf(test{})
-  ctx.Log.Logf("test", "TEST_TYPE: %+v", test_type)
-  test_struct_info, err := GetStructInfo(ctx, test_struct_type)
+  err := RegisterStruct[test](ctx)
   fatalErr(t, err)
-  ctx.RegisterType(test_struct_type, test_type, nil, SerializeStruct(test_struct_info), nil, DeserializeStruct(test_struct_info))
 
   test_int := 10
   test_string := "test"

signal.go

@@ -143,66 +143,6 @@ func NewResponseHeader(req_id uuid.UUID, direction SignalDirection) ResponseHead
   }
 }
 
-type CreateSignal struct {
-  SignalHeader
-}
-
-func (signal CreateSignal) Permission() Tree {
-  return Tree{
-    SerializedType(CreateSignalType): nil,
-  }
-}
-
-func NewCreateSignal() *CreateSignal {
-  return &CreateSignal{
-    NewSignalHeader(Direct),
-  }
-}
-
-type StartSignal struct {
-  SignalHeader
-}
-func (signal StartSignal) Permission() Tree {
-  return Tree{
-    SerializedType(StartSignalType): nil,
-  }
-}
-func NewStartSignal() *StartSignal {
-  return &StartSignal{
-    NewSignalHeader(Direct),
-  }
-}
-
-type StoppedSignal struct {
-  ResponseHeader
-  Source NodeID
-}
-func (signal StoppedSignal) Permission() Tree {
-  return Tree{
-    ResponseType: nil,
-  }
-}
-func NewStoppedSignal(sig *StopSignal, source NodeID) *StoppedSignal {
-  return &StoppedSignal{
-    NewResponseHeader(sig.ID(), Up),
-    source,
-  }
-}
-
-type StopSignal struct {
-  SignalHeader
-}
-func (signal StopSignal) Permission() Tree {
-  return Tree{
-    SerializedType(StopSignalType): nil,
-  }
-}
-func NewStopSignal() *StopSignal {
-  return &StopSignal{
-    NewSignalHeader(Direct),
-  }
-}
-
 type SuccessSignal struct {
   ResponseHeader
 }
@@ -213,8 +153,8 @@ func (signal SuccessSignal) String() string {
 
 func (signal SuccessSignal) Permission() Tree {
   return Tree{
-    ResponseType: {
-      SerializedType(SuccessSignalType): nil,
+    SerializedType(SignalTypeFor[ResponseSignal]()): {
+      SerializedType(SignalTypeFor[SuccessSignal]()): nil,
     },
   }
 }
@@ -233,8 +173,8 @@ func (signal ErrorSignal) String() string {
 }
 func (signal ErrorSignal) Permission() Tree {
   return Tree{
-    ResponseType: {
-      SerializedType(ErrorSignalType): nil,
+    SerializedType(SignalTypeFor[ResponseSignal]()): {
+      SerializedType(SignalTypeFor[ErrorSignal]()): nil,
     },
   }
 }
@@ -250,7 +190,7 @@ type ACLTimeoutSignal struct {
 }
 func (signal ACLTimeoutSignal) Permission() Tree {
   return Tree{
-    SerializedType(ACLTimeoutSignalType): nil,
+    SerializedType(SignalTypeFor[ACLTimeoutSignal]()): nil,
   }
 }
 func NewACLTimeoutSignal(req_id uuid.UUID) *ACLTimeoutSignal {
@@ -263,17 +203,17 @@ func NewACLTimeoutSignal(req_id uuid.UUID) *ACLTimeoutSignal {
 type StatusSignal struct {
   SignalHeader
   Source NodeID `gv:"source"`
-  Changes Changes `gv:"changes"`
+  Changes map[ExtType]Changes `gv:"changes"`
 }
 func (signal StatusSignal) Permission() Tree {
   return Tree{
-    StatusType: nil,
+    SerializedType(SignalTypeFor[StatusSignal]()): nil,
   }
 }
 func (signal StatusSignal) String() string {
   return fmt.Sprintf("StatusSignal(%s, %+v)", signal.SignalHeader, signal.Changes)
 }
-func NewStatusSignal(source NodeID, changes Changes) *StatusSignal {
+func NewStatusSignal(source NodeID, changes map[ExtType]Changes) *StatusSignal {
   return &StatusSignal{
     NewSignalHeader(Up),
     source,
@@ -294,7 +234,7 @@ const (
 
 func (signal LinkSignal) Permission() Tree {
   return Tree{
-    SerializedType(LinkSignalType): Tree{
+    SerializedType(SignalTypeFor[LinkSignal]()): Tree{
       Hash(LinkActionBase, signal.Action): nil,
     },
   }
@@ -322,7 +262,7 @@ const (
 
 func (signal LockSignal) Permission() Tree {
   return Tree{
-    SerializedType(LockSignalType): Tree{
+    SerializedType(SignalTypeFor[LockSignal]()): Tree{
       Hash(LockStateBase, signal.State): nil,
     },
   }
@@ -349,11 +289,11 @@ func (signal ReadSignal) Permission() Tree {
   for ext, fields := range(signal.Extensions) {
     field_tree := Tree{}
     for _, field := range(fields) {
-      field_tree[Hash(FieldNameBase, field)]  = nil
+      field_tree[SerializedType(GetFieldTag(field))] = nil
     }
     ret[SerializedType(ext)] = field_tree
   }
-  return Tree{SerializedType(ReadSignalType): ret}
+  return Tree{SerializedType(SignalTypeFor[ReadSignal]()): ret}
 }
 
 func NewReadSignal(exts map[ExtType][]string) *ReadSignal {
@@ -376,8 +316,8 @@ func (signal ReadResultSignal) String() string {
 
 func (signal ReadResultSignal) Permission() Tree {
   return Tree{
-    ResponseType: {
-      SerializedType(ReadResultSignalType): nil,
+    SerializedType(SignalTypeFor[ResponseSignal]()): {
+      SerializedType(SignalTypeFor[ReadResultSignal]()): nil,
     },
   }
 }