Cleanup and move away from capnp to custom TLV serialization

.gitignore

@@ -1,12 +1,15 @@
 # Ignore everything
 *
+!/go-capnp
 
 # But not these files...
 !/.gitignore
 
 !*.go
+*.capnp.go
 !go.sum
 !go.mod
+!*.capnp
 
 !README.md
 !LICENSE

Makefile

@@ -0,0 +1,9 @@
+.PHONY: schema test
+
+test: schema
+	clear && go test
+
+schema: signal/signal.capnp.go
+
+%.capnp.go: %.capnp
+	capnp compile -I ./go-capnp/std -ogo $<

context.go

@@ -1,124 +1,127 @@
 package graphvent
 
 import (
-  badger "github.com/dgraph-io/badger/v3"
-  "fmt"
-  "sync"
-  "errors"
-  "runtime"
-  "crypto/sha512"
   "crypto/ecdh"
+  "crypto/sha512"
   "encoding/binary"
-)
+  "errors"
+  "fmt"
+  "reflect"
+  "runtime"
+  "sync"
 
-// A Type can be Hashed by Hash
-type TypeName interface {
-  String() string
-  Prefix() string
-}
+  badger "github.com/dgraph-io/badger/v3"
+)
 
-// Hashed a Type to a uint64
-func Hash(t TypeName) uint64 {
-  hash := sha512.Sum512([]byte(fmt.Sprintf("%s%s", t.Prefix(), t.String())))
-  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
+func Hash(base string, name string) uint64 {
+  digest := append([]byte(base), 0x00)
+  digest = append(digest, []byte(name)...)
+  hash := sha512.Sum512(digest)
+  return binary.BigEndian.Uint64(hash[0:8])
 }
 
-// NodeType identifies the 'class' of a node
-type NodeType string
-func (node NodeType) Prefix() string { return "NODE: " }
-func (node NodeType) String() string { return string(node) }
+type ExtType uint64
+type NodeType uint64
+type SignalType uint64
+type PolicyType uint64
+type SerializedType uint64
 
-// ExtType identifies an extension on a node
-type ExtType string
-func (ext ExtType) Prefix() string { return "EXTENSION: " }
-func (ext ExtType) String() string { return string(ext) }
-
-//Function to load an extension from bytes
-type ExtensionLoadFunc func(*Context,[]byte) (Extension, error)
-func LoadExtension[T any, E interface {
-  *T
-  Extension
-}](ctx *Context, data []byte) (Extension, error) {
-  e := E(new(T))
-  err := e.Deserialize(ctx, data)
-  if err != nil {
-    return nil, err
-  }
+func NewExtType(name string) ExtType {
+  return ExtType(Hash(ExtTypeBase, name))
+}
 
-  return e, nil
+func NewNodeType(name string) NodeType {
+  return NodeType(Hash(NodeTypeBase, name))
 }
 
-type PolicyType string
-func (policy PolicyType) Prefix() string { return "POLICY: " }
-func (policy PolicyType) String() string { return string(policy) }
+func NewSignalType(name string) SignalType {
+  return SignalType(Hash(SignalTypeBase, name))
+}
 
-type PolicyLoadFunc func(*Context,[]byte) (Policy, error)
-func LoadPolicy[T any, P interface {
-  *T
-  Policy
-}](ctx *Context, data []byte) (Policy, error) {
-  p := P(new(T))
-  err := p.Deserialize(ctx, data)
-  if err != nil {
-    return nil, err
-  }
-  return p, nil
+func NewPolicyType(name string) PolicyType {
+  return PolicyType(Hash(PolicyTypeBase, name))
 }
 
-type PolicyInfo struct {
-  Load PolicyLoadFunc
-  Type PolicyType
+func NewSerializedType(name string) SerializedType {
+  return SerializedType(Hash(SerializedTypeBase, name))
 }
 
-// ExtType and NodeType constants
 const (
-  ListenerExtType = ExtType("LISTENER")
-  LockableExtType = ExtType("LOCKABLE")
-  GQLExtType      = ExtType("GQL")
-  GroupExtType    = ExtType("GROUP")
-  ECDHExtType     = ExtType("ECDH")
-
-  GQLNodeType = NodeType("GQL")
+  ExtTypeBase = "ExtType"
+  NodeTypeBase = "NodeType"
+  SignalTypeBase = "SignalType"
+  PolicyTypeBase = "PolicyType"
+  SerializedTypeBase = "SerializedType"
+  FieldNameBase = "FieldName"
 )
 
 var (
+  ListenerExtType = NewExtType("LISTENER")
+  LockableExtType = NewExtType("LOCKABLE")
+  GQLExtType      = NewExtType("GQL")
+  GroupExtType    = NewExtType("GROUP")
+  ECDHExtType     = NewExtType("ECDH")
+
+  GQLNodeType = NewNodeType("GQL")
+
+  StopSignalType       = NewSignalType("STOP")
+  CreateSignalType     = NewSignalType("CREATE")
+  StartSignalType      = NewSignalType("START")
+  ErrorSignalType      = NewSignalType("ERROR")
+  StatusSignalType     = NewSignalType("STATUS")
+  LinkSignalType       = NewSignalType("LINK")
+  LockSignalType       = NewSignalType("LOCK")
+  ReadSignalType       = NewSignalType("READ")
+  ReadResultSignalType = NewSignalType("READ_RESULT")
+  ACLTimeoutSignalType = NewSignalType("ACL_TIMEOUT")
+
+  MemberOfPolicyType      = NewPolicyType("USER_OF")
+  RequirementOfPolicyType = NewPolicyType("REQUIEMENT_OF")
+  PerNodePolicyType       = NewPolicyType("PER_NODE")
+  AllNodesPolicyType      = NewPolicyType("ALL_NODES")
+
+  StructType = NewSerializedType("struct")
+  SliceType = NewSerializedType("slice")
+  ArrayType = NewSerializedType("array")
+  PointerType = NewSerializedType("pointer")
+  MapType = NewSerializedType("map")
+  ErrorType = NewSerializedType("error")
+  ExtensionType = NewSerializedType("extension")
+
+  StringType = NewSerializedType("string")
+  NodeKeyType = NewSerializedType("node_key")
+
   NodeNotFoundError = errors.New("Node not found in DB")
   ECDH = ecdh.X25519()
 )
 
-type SignalLoadFunc func(*Context,[]byte) (Signal, error)
-func LoadSignal[T any, S interface{
-  *T
-  Signal
-}](ctx *Context, data []byte) (Signal, error) {
-  s := S(new(T))
-  err := s.Deserialize(ctx, data)
-  if err != nil {
-    return nil, err
-  }
+type ExtensionInfo struct {
+  Type reflect.Type
+  Data interface{}
+}
 
-  return s, nil
+type NodeInfo struct {
+  Extensions []ExtType
 }
 
-type SignalInfo struct {
-  Load SignalLoadFunc
-  Type SignalType
+type TypeSerialize func(*Context,interface{}) ([]byte, error)
+type TypeDeserialize func(*Context,[]byte) (interface{}, error)
+type TypeInfo struct {
+  Type reflect.Type
+  Serialize TypeSerialize
+  Deserialize TypeDeserialize
 }
 
-// Information about a registered extension
-type ExtensionInfo struct {
-  // Function used to load extensions of this type from the database
-  Load ExtensionLoadFunc
-  Type ExtType
-  // Extra context data shared between nodes of this class
-  Data interface{}
+type Int int
+func (i Int) MarshalBinary() ([]byte, error) {
+  ret := make([]byte, 8)
+  binary.BigEndian.PutUint64(ret, uint64(i))
+  return ret, nil
 }
 
-// Information about a registered node type
-type NodeInfo struct {
-  Type NodeType
-  // Required extensions to be a valid node of this class
-  Extensions []ExtType
+type String string
+func (str String) MarshalBinary() ([]byte, error) {
+  return []byte(str), nil
 }
 
 // A Context stores all the data to run a graphvent process
@@ -128,101 +131,132 @@ type Context struct {
   // Logging interface
   Log Logger
   // Map between database extension hashes and the registered info
-  Extensions map[uint64]ExtensionInfo
+  Extensions map[ExtType]ExtensionInfo
+  ExtensionTypes map[reflect.Type]ExtType
   // Map between databse policy hashes and the registered info
-  Policies map[uint64]PolicyInfo
+  Policies map[PolicyType]reflect.Type
+  PolicyTypes map[reflect.Type]PolicyType
   // Map between serialized signal hashes and the registered info
-  Signals map[uint64]SignalInfo
+  Signals map[SignalType]reflect.Type
+  SignalTypes map[reflect.Type]SignalType
   // Map between database type hashes and the registered info
-  Types map[uint64]*NodeInfo
+  Nodes map[NodeType]NodeInfo
+  // Map between go types and registered info
+  Types map[SerializedType]TypeInfo
+  TypeReflects map[reflect.Type]SerializedType
+
   // Routing map to all the nodes local to this context
-  NodesLock sync.RWMutex
-  Nodes map[NodeID]*Node
+  nodeMapLock sync.RWMutex
+  nodeMap map[NodeID]*Node
 }
 
 // Register a NodeType to the context, with the list of extensions it requires
 func (ctx *Context) RegisterNodeType(node_type NodeType, extensions []ExtType) error {
-  type_hash := Hash(node_type)
-  _, exists := ctx.Types[type_hash]
+  _, exists := ctx.Nodes[node_type]
   if exists == true {
-    return fmt.Errorf("Cannot register node type %s, type already exists in context", node_type)
+    return fmt.Errorf("Cannot register node type %+v, type already exists in context", node_type)
   }
 
   ext_found := map[ExtType]bool{}
   for _, extension := range(extensions) {
-    _, in_ctx := ctx.Extensions[Hash(extension)]
+    _, in_ctx := ctx.Extensions[extension]
     if in_ctx == false {
-      return fmt.Errorf("Cannot register node type %s, required extension %s not in context", node_type, extension)
+      return fmt.Errorf("Cannot register node type %+v, required extension %+v not in context", node_type, extension)
     }
 
     _, duplicate := ext_found[extension]
     if duplicate == true {
-      return fmt.Errorf("Duplicate extension %s found in extension list", extension)
+      return fmt.Errorf("Duplicate extension %+v found in extension list", extension)
     }
 
     ext_found[extension] = true
   }
 
-  ctx.Types[type_hash] = &NodeInfo{
-    Type: node_type,
+  ctx.Nodes[node_type] = NodeInfo{
     Extensions: extensions,
   }
   return nil
 }
 
-func RegisterSignal[T any, S interface {
-  *T
-  Signal
-}](ctx *Context, signal_type SignalType) error {
-  type_hash := Hash(signal_type)
-  _, exists := ctx.Signals[type_hash]
+func (ctx *Context) RegisterPolicy(reflect_type reflect.Type, policy_type PolicyType) error {
+  _, exists := ctx.Policies[policy_type]
   if exists == true {
-    return fmt.Errorf("Cannot register signal of type %s, type already exists in context", signal_type)
+    return fmt.Errorf("Cannot register policy of type %+v, type already exists in context", policy_type)
   }
 
-  ctx.Signals[type_hash] = SignalInfo{
-    Load: LoadSignal[T, S],
-    Type: signal_type,
+  ctx.Policies[policy_type] = reflect_type
+  ctx.PolicyTypes[reflect_type] = policy_type
+  return nil
+}
+
+func (ctx *Context)RegisterSignal(reflect_type reflect.Type, signal_type SignalType) error {
+  _, exists := ctx.Signals[signal_type]
+  if exists == true {
+    return fmt.Errorf("Cannot register signal of type %+v, type already exists in context", signal_type)
   }
+
+  ctx.Signals[signal_type] = reflect_type
+  ctx.SignalTypes[reflect_type] = signal_type
   return nil
 }
 
 // Add a node to a context, returns an error if the def is invalid or already exists in the context
-func RegisterExtension[T any, E interface{
-  *T
-  Extension
-}](ctx *Context, data interface{}) error {
-  var zero E
-  ext_type := zero.Type()
-  type_hash := Hash(ext_type)
-  _, exists := ctx.Extensions[type_hash]
+func (ctx *Context)RegisterExtension(reflect_type reflect.Type, ext_type ExtType, data interface{}) error {
+  _, exists := ctx.Extensions[ext_type]
   if exists == true {
-    return fmt.Errorf("Cannot register extension of type %s, type already exists in context", ext_type)
+    return fmt.Errorf("Cannot register extension of type %+v, type already exists in context", ext_type)
   }
 
-  ctx.Extensions[type_hash] = ExtensionInfo{
-    Load: LoadExtension[T,E],
-    Type: ext_type,
+  ctx.Extensions[ext_type] = ExtensionInfo{
+    Type: reflect_type,
     Data: data,
   }
+  ctx.ExtensionTypes[reflect_type] = ext_type
+
+  return nil
+}
+
+func (ctx *Context)RegisterType(reflect_type reflect.Type, ctx_type SerializedType, serialize TypeSerialize, deserialize TypeDeserialize) error {
+  _, exists := ctx.Types[ctx_type]
+  if exists == true {
+    return fmt.Errorf("Cannot register field of type %+v, type already exists in context", ctx_type)
+  }
+  _, exists = ctx.TypeReflects[reflect_type]
+  if exists == true {
+    return fmt.Errorf("Cannot register field with type %+v, type already registered in context", reflect_type)
+  }
+  if deserialize == nil {
+    return fmt.Errorf("Cannot register field without deserialize function")
+  }
+  if serialize == nil {
+    return fmt.Errorf("Cannot register field without serialize function")
+  }
+
+  ctx.Types[ctx_type] = TypeInfo{
+    Type: reflect_type,
+    Serialize: serialize,
+    Deserialize: deserialize,
+  }
+  ctx.TypeReflects[reflect_type] = ctx_type
+
   return nil
 }
 
 func (ctx *Context) AddNode(id NodeID, node *Node) {
-  ctx.NodesLock.Lock()
-  ctx.Nodes[id] = node
-  ctx.NodesLock.Unlock()
+  ctx.nodeMapLock.Lock()
+  ctx.nodeMap[id] = node
+  ctx.nodeMapLock.Unlock()
 }
 
 func (ctx *Context) Node(id NodeID) (*Node, bool) {
-  ctx.NodesLock.RLock()
-  node, exists := ctx.Nodes[id]
-  ctx.NodesLock.RUnlock()
+  ctx.nodeMapLock.RLock()
+  node, exists := ctx.nodeMap[id]
+  ctx.nodeMapLock.RUnlock()
   return node, exists
 }
 
 // Get a node from the context, or load from the database if not loaded
-func (ctx *Context) GetNode(id NodeID) (*Node, error) {
+func (ctx *Context) getNode(id NodeID) (*Node, error) {
   target, exists := ctx.Node(id)
 
   if exists == false {
@@ -241,7 +275,7 @@ func (ctx *Context) Send(messages Messages) error {
     if msg.Dest == ZeroID {
       panic("Can't send to null ID")
     }
-    target, err := ctx.GetNode(msg.Dest)
+    target, err := ctx.getNode(msg.Dest)
     if err == nil {
       select {
       case target.MsgChan <- msg:
@@ -262,55 +296,311 @@ func (ctx *Context) Send(messages Messages) error {
   return nil
 }
 
+type defaultKind struct {
+  Type SerializedType
+  Serialize func(interface{})([]byte, error)
+  Deserialize func([]byte)(interface{}, error)
+}
+
+var defaultKinds = map[reflect.Kind]defaultKind{
+  reflect.Int: {
+    Deserialize: func(data []byte)(interface{}, error){
+      if len(data) != 8 {
+        return nil, fmt.Errorf("invalid length: %d/8", len(data))
+      }
+      return int(binary.BigEndian.Uint64(data)), nil
+    },
+    Serialize: func(val interface{})([]byte, error){
+      i, ok := val.(int)
+      if ok == false {
+        return nil, fmt.Errorf("invalid type %+v", reflect.TypeOf(val))
+      } else {
+        bytes := make([]byte, 8)
+        binary.BigEndian.PutUint64(bytes, uint64(i))
+        return bytes, nil
+      }
+    },
+  },
+}
+
+type SerializedValue struct {
+  TypeStack []uint64
+  Data []byte
+}
+
+func (field SerializedValue) MarshalBinary() ([]byte, error) {
+  data := []byte{}
+  for _, t := range(field.TypeStack) {
+    t_ser := make([]byte, 8)
+    binary.BigEndian.PutUint64(t_ser, uint64(t))
+    data = append(data, t_ser...)
+  }
+  data = append(data, field.Data...)
+  return data, nil
+}
+
+func RecurseTypes(ctx *Context, t reflect.Type) ([]uint64, []reflect.Kind, error) {
+  var ctx_type uint64 = 0x00
+  ctype, exists := ctx.TypeReflects[t]
+  if exists == true {
+    ctx_type = uint64(ctype)
+  }
+
+  var new_types []uint64
+  var new_kinds []reflect.Kind
+  kind := t.Kind()
+  switch kind {
+  case reflect.Array:
+    if ctx_type == 0x00 {
+      ctx_type = uint64(ArrayType)
+    }
+    elem_types, elem_kinds, err := RecurseTypes(ctx, t.Elem())
+    if err != nil {
+      return nil, nil, err
+    }
+    new_types = append(new_types, ctx_type)
+    new_types = append(new_types, elem_types...)
+
+    new_kinds = append(new_kinds, reflect.Array)
+    new_kinds = append(new_kinds, elem_kinds...)
+  case reflect.Map:
+    if ctx_type == 0x00 {
+      ctx_type = uint64(MapType)
+    }
+    key_types, key_kinds, err := RecurseTypes(ctx, t.Key())
+    if err != nil {
+      return nil, nil, err
+    }
+    elem_types, elem_kinds, err := RecurseTypes(ctx, t.Elem())
+    if err != nil {
+      return nil, nil, err
+    }
+    new_types = append(new_types, ctx_type)
+    new_types = append(new_types, key_types...)
+    new_types = append(new_types, elem_types...)
+
+    new_kinds = append(new_kinds, reflect.Map)
+    new_kinds = append(new_kinds, key_kinds...)
+    new_kinds = append(new_kinds, elem_kinds...)
+  case reflect.Slice:
+    if ctx_type == 0x00 {
+      ctx_type = uint64(SliceType)
+    }
+    elem_types, elem_kinds, err := RecurseTypes(ctx, t.Elem())
+    if err != nil {
+      return nil, nil, err
+    }
+    new_types = append(new_types, ctx_type)
+    new_types = append(new_types, elem_types...)
+
+    new_kinds = append(new_kinds, reflect.Slice)
+    new_kinds = append(new_kinds, elem_kinds...)
+  case reflect.Pointer:
+    if ctx_type == 0x00 {
+      ctx_type = uint64(PointerType)
+    }
+    elem_types, elem_kinds, err := RecurseTypes(ctx, t.Elem())
+    if err != nil {
+      return nil, nil, err
+    }
+    new_types = append(new_types, ctx_type)
+    new_types = append(new_types, elem_types...)
+
+    new_kinds = append(new_kinds, reflect.Pointer)
+    new_kinds = append(new_kinds, elem_kinds...)
+  case reflect.String:
+    if ctx_type == 0x00 {
+      ctx_type = uint64(StringType)
+    }
+    new_types = append(new_types, ctx_type)
+    new_kinds = append(new_kinds, reflect.String)
+  default:
+    return nil, nil, fmt.Errorf("unhandled kind: %+v - %+v", kind, t)
+  }
+  return new_types, new_kinds, nil
+}
+
+func serializeValue(ctx *Context, kind_stack []reflect.Kind, value reflect.Value) ([]byte, error) {
+  kind := kind_stack[len(kind_stack) - 1]
+  switch kind {
+  default:
+    return nil, fmt.Errorf("unhandled kind: %+v", kind)
+  }
+}
+
+func SerializeValue(ctx *Context, value reflect.Value) (SerializedValue, error) {
+  if value.IsValid() == false {
+    return SerializedValue{}, fmt.Errorf("Cannot serialize invalid value: %+v", value)
+  }
+
+  type_stack, kind_stack, err := RecurseTypes(ctx, value.Type())
+  if err != nil {
+    return SerializedValue{}, err
+  }
+
+  bytes, err := serializeValue(ctx, kind_stack, value)
+  if err != nil {
+    return SerializedValue{}, err
+  }
+  return SerializedValue{
+    type_stack,
+    bytes,
+  }, nil
+}
+
+/*
+  default:
+    kind_def, handled := defaultKinds[kind]
+    if handled == false {
+      ctx_type, handled := ctx.TypeReflects[value.Type()]
+      if handled == false {
+        err = fmt.Errorf("%+v is not a handled reflect type", value.Type())
+        break
+      }
+      type_info, handled := ctx.Types[ctx_type]
+      if handled == false {
+        err = fmt.Errorf("%+v is not a handled reflect type(INTERNAL_ERROR)", value.Type())
+        break
+      }
+      field_ser, err := type_info.Serialize(ctx, value.Interface())
+      if err != nil {
+        err = fmt.Errorf(err.Error())
+        break
+      }
+      ret = SerializedValue{
+        []uint64{uint64(ctx_type)},
+        field_ser,
+      }
+    }
+    field_ser, err := kind_def.Serialize(value.Interface())
+    if err != nil {
+      err = fmt.Errorf(err.Error())
+    } else {
+      ret = SerializedValue{
+        []uint64{uint64(kind_def.Type)},
+        field_ser,
+      }
+    }
+*/
+
+func SerializeField(ctx *Context, ext Extension, field_name string) (SerializedValue, error) {
+  if ext == nil {
+    return SerializedValue{}, fmt.Errorf("Cannot get fields on nil Extension")
+  }
+  ext_value := reflect.ValueOf(ext).Elem()
+  field := ext_value.FieldByName(field_name)
+  if field.IsValid() == false {
+    return SerializedValue{}, fmt.Errorf("%s is not a field in %+v", field_name, ext)
+  } else {
+    return SerializeValue(ctx, field)
+  }
+}
+
+func SerializeSignal(ctx *Context, signal Signal, ctx_type SignalType) (SerializedValue, error) {
+  return SerializedValue{}, nil
+}
+
+func SerializeExtension(ctx *Context, ext Extension, ctx_type ExtType) (SerializedValue, error) {
+  if ext == nil {
+    return SerializedValue{}, fmt.Errorf("Cannot serialize nil Extension ")
+  }
+  ext_type := reflect.TypeOf(ext).Elem()
+  ext_value := reflect.ValueOf(ext).Elem()
+
+  m := map[string]SerializedValue{}
+  for _, field := range(reflect.VisibleFields(ext_type)) {
+    ext_tag, tagged_ext := field.Tag.Lookup("ext")
+    if tagged_ext == false {
+      continue
+    } else {
+      field_value := ext_value.FieldByIndex(field.Index)
+      var err error
+      m[ext_tag], err = SerializeValue(ctx, field_value)
+      if err != nil {
+        return SerializedValue{}, err
+      }
+    }
+  }
+  map_value := reflect.ValueOf(m)
+  map_ser, err := SerializeValue(ctx, map_value)
+  if err != nil {
+    return SerializedValue{}, err
+  }
+  return SerializedValue{
+    append([]uint64{uint64(ctx_type)}, map_ser.TypeStack...),
+    map_ser.Data,
+  }, nil
+}
+
+func DeserializeValue(ctx *Context, value SerializedValue) (interface{}, error) {
+  // TODO: do the opposite of SerializeValue.
+  // 1) Check the type to handle special types(array, list, map, pointer)
+  // 2) Check if the type is registered in the context, handle if so
+  // 3) Check if the type is a default type, handle if so
+  // 4) Return error if we don't know how to deserialize the type
+  return nil, fmt.Errorf("Undefined")
+}
+
 // Create a new Context with the base library content added
 func NewContext(db * badger.DB, log Logger) (*Context, error) {
   ctx := &Context{
     DB: db,
     Log: log,
-    Extensions: map[uint64]ExtensionInfo{},
-    Types: map[uint64]*NodeInfo{},
-    Signals: map[uint64]SignalInfo{},
-    Nodes: map[NodeID]*Node{},
+    Policies: map[PolicyType]reflect.Type{},
+    PolicyTypes: map[reflect.Type]PolicyType{},
+    Extensions: map[ExtType]ExtensionInfo{},
+    ExtensionTypes: map[reflect.Type]ExtType{},
+    Signals: map[SignalType]reflect.Type{},
+    SignalTypes: map[reflect.Type]SignalType{},
+    Nodes: map[NodeType]NodeInfo{},
+    nodeMap: map[NodeID]*Node{},
+    Types: map[SerializedType]TypeInfo{},
+    TypeReflects: map[reflect.Type]SerializedType{},
   }
 
   var err error
-  err = RegisterExtension[LockableExt,*LockableExt](ctx, nil)
+  err = ctx.RegisterExtension(reflect.TypeOf((*LockableExt)(nil)), LockableExtType, nil)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterExtension[ListenerExt,*ListenerExt](ctx, nil)
+  err = ctx.RegisterExtension(reflect.TypeOf((*ListenerExt)(nil)), ListenerExtType, nil)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterExtension[ECDHExt,*ECDHExt](ctx, nil)
+  err = ctx.RegisterExtension(reflect.TypeOf((*GroupExt)(nil)), GroupExtType, nil)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterExtension[GroupExt,*GroupExt](ctx, nil)
+  gql_ctx := NewGQLExtContext()
+  err = ctx.RegisterExtension(reflect.TypeOf((*GQLExt)(nil)), GQLExtType, gql_ctx)
   if err != nil {
     return nil, err
   }
 
-  gql_ctx := NewGQLExtContext()
-  err = RegisterExtension[GQLExt,*GQLExt](ctx, gql_ctx)
+  err = ctx.RegisterSignal(reflect.TypeOf((*StopSignal)(nil)), StopSignalType)
+  if err != nil {
+    return nil, err
+  }
+
+  err = ctx.RegisterSignal(reflect.TypeOf((*CreateSignal)(nil)), CreateSignalType)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterSignal[BaseSignal, *BaseSignal](ctx, StopSignalType)
+  err = ctx.RegisterSignal(reflect.TypeOf((*StartSignal)(nil)), StartSignalType)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterSignal[BaseSignal, *BaseSignal](ctx, NewSignalType)
+  err = ctx.RegisterSignal(reflect.TypeOf((*ReadSignal)(nil)), ReadSignalType)
   if err != nil {
     return nil, err
   }
 
-  err = RegisterSignal[BaseSignal, *BaseSignal](ctx, StartSignalType)
+  err = ctx.RegisterSignal(reflect.TypeOf((*ReadResultSignal)(nil)), ReadResultSignalType)
   if err != nil {
     return nil, err
   }

ecdh.go

@@ -1,167 +0,0 @@
-package graphvent
-
-import (
-  "fmt"
-  "time"
-  "encoding/json"
-  "crypto/ecdsa"
-  "crypto/x509"
-  "crypto/ecdh"
-)
-
-type ECDHState struct {
-  ECKey *ecdh.PrivateKey
-  SharedSecret []byte
-}
-
-type ECDHStateJSON struct {
-  ECKey []byte `json:"ec_key"`
-  SharedSecret []byte `json:"shared_secret"`
-}
-
-func (state *ECDHState) MarshalJSON() ([]byte, error) {
-  var key_bytes []byte
-  var err error
-  if state.ECKey != nil {
-    key_bytes, err = x509.MarshalPKCS8PrivateKey(state.ECKey)
-    if err != nil {
-      return nil, err
-    }
-  }
-
-  return json.Marshal(&ECDHStateJSON{
-    ECKey: key_bytes,
-    SharedSecret: state.SharedSecret,
-  })
-}
-
-func (state *ECDHState) UnmarshalJSON(data []byte) error {
-  var j ECDHStateJSON
-  err := json.Unmarshal(data, &j)
-  if err != nil {
-    return err
-  }
-
-  state.SharedSecret = j.SharedSecret
-  if len(j.ECKey) == 0 {
-    state.ECKey = nil
-  } else {
-    tmp_key, err := x509.ParsePKCS8PrivateKey(j.ECKey)
-    if err != nil {
-      return err
-    }
-
-    ecdsa_key, ok := tmp_key.(*ecdsa.PrivateKey)
-    if ok == false {
-      return fmt.Errorf("Parsed wrong key type from DB for ECDHState")
-    }
-
-    state.ECKey, err = ecdsa_key.ECDH()
-    if err != nil {
-      return err
-    }
-  }
-
-  return nil
-}
-
-type ECDHMap map[NodeID]ECDHState
-
-func (m ECDHMap) MarshalJSON() ([]byte, error) {
-  tmp := map[string]ECDHState{}
-  for id, state := range(m) {
-    tmp[id.String()] = state
-  }
-
-  return json.Marshal(tmp)
-}
-
-type ECDHExt struct {
-  ECDHStates ECDHMap
-}
-
-func NewECDHExt() *ECDHExt {
-  return &ECDHExt{
-    ECDHStates: ECDHMap{},
-  }
-}
-
-func ResolveFields[T Extension](t T, name string, field_funcs map[string]func(T)interface{})interface{} {
-  var zero T
-  field_func, ok := field_funcs[name]
-  if ok == false {
-    return fmt.Errorf("%s is not a field of %s", name, zero.Type())
-  }
-  return field_func(t)
-}
-
-func (ext *ECDHExt) Field(name string) interface{} {
-  return ResolveFields(ext, name, map[string]func(*ECDHExt)interface{}{
-    "ecdh_states": func(ext *ECDHExt) interface{} {
-      return ext.ECDHStates
-    },
-  })
-}
-
-func (ext *ECDHExt) HandleECDHSignal(log Logger, node *Node, signal *ECDHSignal) Messages {
-  source := KeyID(signal.EDDSA)
-
-  messages := Messages{}
-  switch signal.Str {
-  case "req":
-    state, exists := ext.ECDHStates[source]
-    if exists == false {
-      state = ECDHState{nil, nil}
-    }
-    resp, shared_secret, err := NewECDHRespSignal(node, signal)
-    if err == nil {
-      state.SharedSecret = shared_secret
-      ext.ECDHStates[source] = state
-      log.Logf("ecdh", "New shared secret for %s<->%s - %+v", node.ID, source, ext.ECDHStates[source].SharedSecret)
-      messages = messages.Add(node.ID, node.Key, &resp, source)
-    } else {
-      log.Logf("ecdh", "ECDH_REQ_ERR: %s", err)
-      messages = messages.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), err.Error()), source)
-    }
-  case "resp":
-    state, exists := ext.ECDHStates[source]
-    if exists == false || state.ECKey == nil {
-      messages = messages.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "no_req"), source)
-    } else {
-      err := VerifyECDHSignal(time.Now(), signal, DEFAULT_ECDH_WINDOW)
-      if err == nil {
-        shared_secret, err := state.ECKey.ECDH(signal.ECDH)
-        if err == nil {
-          state.SharedSecret = shared_secret
-          state.ECKey = nil
-          ext.ECDHStates[source] = state
-          log.Logf("ecdh", "New shared secret for %s<->%s - %+v", node.ID, source, ext.ECDHStates[source].SharedSecret)
-        }
-      }
-    }
-  default:
-    log.Logf("ecdh", "unknown echd state %s", signal.Str)
-  }
-  return messages
-}
-
-func (ext *ECDHExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) Messages {
-  switch signal.Type() {
-  case ECDHSignalType:
-    sig := signal.(*ECDHSignal)
-    return ext.HandleECDHSignal(ctx.Log, node, sig)
-  }
-  return nil
-}
-
-func (ext *ECDHExt) Type() ExtType {
-  return ECDHExtType
-}
-
-func (ext *ECDHExt) Serialize() ([]byte, error) {
-  return json.Marshal(ext)
-}
-
-func (ext *ECDHExt) Deserialize(ctx *Context, data []byte) error {
-  return json.Unmarshal(data, &ext)
-}

go.mod

@@ -1,6 +1,8 @@
 module github.com/mekkanized/graphvent
 
-go 1.20
+go 1.21.0
+
+replace github.com/mekkanized/graphvent/signal v0.0.0 => ./signal
 
 require (
 	github.com/dgraph-io/badger/v3 v3.2103.5
@@ -11,6 +13,7 @@ require (
 )
 
 require (
+	capnproto.org/go/capnp/v3 v3.0.0-alpha-29 // indirect
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/dgraph-io/badger/v4 v4.1.0 // indirect
@@ -28,8 +31,11 @@ require (
 	github.com/klauspost/compress v1.12.3 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mekkanized/graphvent/signal v0.0.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	go.opencensus.io v0.22.5 // indirect
 	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 // indirect
 	golang.org/x/sys v0.6.0 // indirect
+	zenhack.net/go/util v0.0.0-20230414204917-531d38494cf5 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+capnproto.org/go/capnp/v3 v3.0.0-alpha-29 h1:ICLhiy4Jmp0d7hLQO+HzFAVIft/oxpPAUPV8tqx+eUE=
+capnproto.org/go/capnp/v3 v3.0.0-alpha-29/go.mod h1:+ysMHvOh1EWNOyorxJWs1omhRFiDoKxKkWQACp54jKM=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
@@ -134,6 +136,7 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 h1:SQFwaSi55rU7vdNs9Yr0Z324VNlrF+0wMqRXT4St8ck=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -171,3 +174,5 @@ gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+zenhack.net/go/util v0.0.0-20230414204917-531d38494cf5 h1:yksDCGMVzyn3vlyf0GZ3huiF5FFaMGQpQ3UJvR0EoGA=
+zenhack.net/go/util v0.0.0-20230414204917-531d38494cf5/go.mod h1:1LtNdPAs8WH+BTcQiZAOo2MIKD/5jyK/u7sZ9ZPe5SE=

gql.go

@@ -205,7 +205,7 @@ func NewResolveContext(ctx *Context, server *Node, gql_ext *GQLExt, r *http.Requ
   if err != nil {
     return nil, fmt.Errorf("GQL_REQUEST_ERR: failed to parse ID from id_bytes %+v", id_bytes)
   }
-  auth_id := NodeID{auth_uuid}
+  auth_id := NodeID(auth_uuid)
 
   key_bytes, err := base64.StdEncoding.DecodeString(key_b64)
   if err != nil {
@@ -234,7 +234,7 @@ func NewResolveContext(ctx *Context, server *Node, gql_ext *GQLExt, r *http.Requ
     Ext: gql_ext,
     Chans: map[uuid.UUID]chan Signal{},
     Context: ctx,
-    GQLContext: ctx.Extensions[Hash(GQLExtType)].Data.(*GQLExtContext),
+    GQLContext: ctx.Extensions[GQLExtType].Data.(*GQLExtContext),
     Server: server,
     User: key_id,
     Key: key,
@@ -270,7 +270,7 @@ func GQLHandler(ctx *Context, server *Node, gql_ext *GQLExt) func(http.ResponseW
     query := GQLPayload{}
     json.Unmarshal(str, &query)
 
-    gql_context := ctx.Extensions[Hash(GQLExtType)].Data.(*GQLExtContext)
+    gql_context := ctx.Extensions[GQLExtType].Data.(*GQLExtContext)
 
     params := graphql.Params{
       Schema: gql_context.Schema,
@@ -401,7 +401,7 @@ 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[Hash(GQLExtType)].Data.(*GQLExtContext)
+          gql_context := ctx.Extensions[GQLExtType].Data.(*GQLExtContext)
           params := graphql.Params{
             Schema: gql_context.Schema,
             Context: req_ctx,
@@ -543,7 +543,7 @@ func BuildSchema(ctx *GQLExtContext) (graphql.Schema, error) {
   return graphql.NewSchema(schemaConfig)
 }
 
-func RegisterField[T any](ctx *GQLExtContext, gql_type graphql.Type, gql_name string, ext_type ExtType, acl_name string, resolve_fn func(graphql.ResolveParams, T)(interface{}, error)) error {
+func (ctx *GQLExtContext) RegisterField(gql_type graphql.Type, gql_name string, ext_type ExtType, acl_name string, resolve_fn func(graphql.ResolveParams, SerializedValue)(interface{}, error)) error {
   if ctx == nil {
     return fmt.Errorf("ctx is nil")
   }
@@ -561,21 +561,19 @@ func RegisterField[T any](ctx *GQLExtContext, gql_type graphql.Type, gql_name st
     return ResolveNodeResult(p, func(p graphql.ResolveParams, result NodeResult) (interface{}, error) {
       ext, exists := result.Result.Extensions[ext_type]
       if exists == false {
-        return nil, fmt.Errorf("%s is not in the extensions of the result", ext_type)
+        return nil, fmt.Errorf("%+v is not in the extensions of the result", ext_type)
       }
 
-      val_if, exists := ext[acl_name]
+      val_ser, exists := ext[acl_name]
       if exists == false {
-        return nil, fmt.Errorf("%s is not in the fields of %s in the result", acl_name, ext_type)
+        return nil, fmt.Errorf("%s is not in the fields of %+v in the result", acl_name, ext_type)
       }
 
-      var zero T
-      val, ok := val_if.(T)
-      if ok == false {
-        return nil, fmt.Errorf("%s.%s is not %s", ext_type, acl_name, reflect.TypeOf(zero))
+      if val_ser.TypeStack[0] == uint64(ErrorType) {
+        return nil, fmt.Errorf(string(val_ser.Data))
       }
 
-      return resolve_fn(p, val)
+      return resolve_fn(p, val_ser)
     })
   }
 
@@ -681,8 +679,8 @@ func (ctx *GQLExtContext) RegisterInterface(name string, default_name string, in
 
   for field_name, field := range(self_fields) {
     self_field := field
-    err := RegisterField(ctx, ctx_interface.Interface, field_name, self_field.Extension, self_field.ACLName,
-    func(p graphql.ResolveParams, val interface{})(interface{}, error) {
+    err := ctx.RegisterField(ctx_interface.Interface, field_name, self_field.Extension, self_field.ACLName,
+    func(p graphql.ResolveParams, val SerializedValue)(interface{}, error) {
       ctx, err := PrepResolve(p)
       if err != nil {
         return nil, err
@@ -715,7 +713,7 @@ func (ctx *GQLExtContext) RegisterInterface(name string, default_name string, in
 
   for field_name, field := range(list_fields) {
     list_field := field
-    resolve_fn := func(p graphql.ResolveParams, val interface{})(interface{}, error) {
+    resolve_fn := func(p graphql.ResolveParams, val SerializedValue)(interface{}, error) {
       ctx, err := PrepResolve(p)
       if err != nil {
         return nil, err
@@ -736,7 +734,7 @@ func (ctx *GQLExtContext) RegisterInterface(name string, default_name string, in
       return nodes, nil
     }
 
-    err := RegisterField(ctx, ctx_interface.List, field_name, list_field.Extension, list_field.ACLName, resolve_fn)
+    err := ctx.RegisterField(ctx_interface.List, field_name, list_field.Extension, list_field.ACLName, resolve_fn)
     if err != nil {
       return err
     }
@@ -764,7 +762,7 @@ func (ctx *GQLExtContext) RegisterNodeType(node_type NodeType, name string, inte
 
   _, exists := ctx.NodeTypes[node_type]
   if exists == true {
-    return fmt.Errorf("%s already in GQLExtContext.NodeTypes", node_type)
+    return fmt.Errorf("%+v already in GQLExtContext.NodeTypes", node_type)
   }
 
   node_interfaces, err := GQLInterfaces(ctx, interface_names)
@@ -830,19 +828,20 @@ func NewGQLExtContext() *GQLExtContext {
     panic(err)
   }
 
-  err = RegisterField(&context, context.Interfaces["Node"].List, "Members", GroupExtType, "members",
-                      func(p graphql.ResolveParams, val map[NodeID]string)(interface{}, error) {
+  err = context.RegisterField(context.Interfaces["Node"].List, "Members", GroupExtType, "members",
+                      func(p graphql.ResolveParams, val SerializedValue)(interface{}, error) {
                         ctx, err := PrepResolve(p)
                         if err != nil {
                           return nil, err
                         }
-                        node_list := make([]NodeID, len(val))
+                        /*node_list := make([]NodeID, len(val))
                         i := 0
                         for id, _ := range(val) {
                           node_list[i] = id
                           i += 1
                         }
-
+                        */
+                        node_list := []NodeID{}
                         nodes, err := ResolveNodes(ctx, p, node_list)
                         if err != nil {
                           return nil, err
@@ -895,7 +894,7 @@ func NewGQLExtContext() *GQLExtContext {
     panic(err)
   }
 
-  err = RegisterField(&context, graphql.String, "Listen", GQLExtType, "listen", func(p graphql.ResolveParams, listen string) (interface{}, error) {
+  err = context.RegisterField(graphql.String, "Listen", GQLExtType, "listen", func(p graphql.ResolveParams, listen SerializedValue) (interface{}, error) {
     return listen, nil
   })
   if err != nil {
@@ -1000,14 +999,6 @@ type GQLExt struct {
   Listen string `json:"listen"`
 }
 
-func (ext *GQLExt) Field(name string) interface{} {
-  return ResolveFields(ext, name, map[string]func(*GQLExt)interface{}{
-    "listen": func(ext *GQLExt) interface{} {
-      return ext.Listen
-    },
-  })
-}
-
 func (ext *GQLExt) FindResponseChannel(req_id uuid.UUID) chan Signal {
   ext.resolver_response_lock.RLock()
   response_chan, _ := ext.resolver_response[req_id]
@@ -1036,11 +1027,10 @@ func (ext *GQLExt) FreeResponseChannel(req_id uuid.UUID) chan Signal {
 
 func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) Messages {
   // Process ReadResultSignalType by forwarding it to the waiting resolver
-  messages := Messages{}
-  if signal.Type() == ErrorSignalType {
+  switch sig := signal.(type) {
+  case *ErrorSignal:
     // TODO: Forward to resolver if waiting for it
-    sig := signal.(*ErrorSignal)
-    response_chan := ext.FreeResponseChannel(sig.ReqID())
+    response_chan := ext.FreeResponseChannel(sig.Header().ReqID)
     if response_chan != nil {
       select {
       case response_chan <- sig:
@@ -1052,9 +1042,8 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
     } else {
       ctx.Log.Logf("gql", "received error signal response %+v with no mapped resolver", sig)
     }
-  } else if signal.Type() == ReadResultSignalType {
-    sig := signal.(*ReadResultSignal)
-    response_chan := ext.FindResponseChannel(sig.ReqID())
+  case *ReadResultSignal:
+    response_chan := ext.FindResponseChannel(sig.ReqID)
     if response_chan != nil {
       select {
       case response_chan <- sig:
@@ -1065,23 +1054,23 @@ func (ext *GQLExt) Process(ctx *Context, node *Node, source NodeID, signal Signa
     } else {
       ctx.Log.Logf("gql", "Received read result that wasn't expected - %+v", sig)
     }
-  } else if signal.Type() == StartSignalType {
+  case *StartSignal:
     ctx.Log.Logf("gql", "starting gql server %s", node.ID)
     err := ext.StartGQLServer(ctx, node)
     if err == nil {
-      node.QueueSignal(time.Now(), NewStatusSignal("server_started", node.ID))
+      node.QueueSignal(time.Now(), NewStatusSignal(node.ID, "server_started"))
     } else {
       ctx.Log.Logf("gql", "GQL_RESTART_ERROR: %s", err)
     }
   }
-  return messages
+  return nil
 }
 
 func (ext *GQLExt) Type() ExtType {
   return GQLExtType
 }
 
-func (ext *GQLExt) Serialize() ([]byte, error) {
+func (ext *GQLExt) MarshalBinary() ([]byte, error) {
   return json.Marshal(ext)
 }
 

gql_interfaces.go

@@ -36,7 +36,7 @@ func NodeInterfaceDefaultIsType(required_extensions []ExtType) func(graphql.IsTy
       return false
     }
 
-    node_type_def, exists := ctx.Context.Types[Hash(node.Result.NodeType)]
+    node_type_def, exists := ctx.Context.Nodes[node.Result.NodeType]
     if exists == false {
       return false
     } else {
@@ -73,7 +73,7 @@ func NodeInterfaceResolveType(required_extensions []ExtType, default_type **grap
     gql_type, exists := ctx.GQLContext.NodeTypes[node.Result.NodeType]
     ctx.Context.Log.Logf("gql", "GQL_INTERFACE_RESOLVE_TYPE(%+v): %+v - %t - %+v - %+v", node, gql_type, exists, required_extensions, *default_type)
     if exists == false {
-      node_type_def, exists := ctx.Context.Types[Hash(node.Result.NodeType)]
+      node_type_def, exists := ctx.Context.Nodes[node.Result.NodeType]
       if exists == false {
         return nil
       } else {

gql_query.go

@@ -51,16 +51,16 @@ func ResolveNodes(ctx *ResolveContext, p graphql.ResolveParams, ids []NodeID) ([
     // Create a read signal, send it to the specified node, and add the wait to the response map if the send returns no error
     read_signal := NewReadSignal(ext_fields)
     msgs := Messages{}
-    msgs = msgs.Add(ctx.Server.ID, ctx.Key, read_signal, id)
+    msgs = msgs.Add(ctx.Context, ctx.Server.ID, ctx.Key, read_signal, id)
 
-    response_chan := ctx.Ext.GetResponseChannel(read_signal.ID())
-    resp_channels[read_signal.ID()] = response_chan
-    node_ids[read_signal.ID()] = id
+    response_chan := ctx.Ext.GetResponseChannel(read_signal.ID)
+    resp_channels[read_signal.ID] = response_chan
+    node_ids[read_signal.ID] = id
 
     // TODO: Send all at once instead of createing Messages for each
     err = ctx.Context.Send(msgs)
     if err != nil {
-      ctx.Ext.FreeResponseChannel(read_signal.ID())
+      ctx.Ext.FreeResponseChannel(read_signal.ID)
       return nil, err
     }
   }
@@ -68,8 +68,8 @@ func ResolveNodes(ctx *ResolveContext, p graphql.ResolveParams, ids []NodeID) ([
   responses := []NodeResult{}
   for sig_id, response_chan := range(resp_channels) {
     // Wait for the response, returning an error on timeout
-    response, err := WaitForSignal(response_chan, time.Millisecond*100, ReadResultSignalType, func(sig *ReadResultSignal)bool{
-      return sig.ReqID() == sig_id
+    response, err := WaitForSignal(response_chan, time.Millisecond*100, func(sig *ReadResultSignal)bool{
+      return sig.ReqID == sig_id
     })
     if err != nil {
       return nil, err

gql_resolvers.go

@@ -81,6 +81,6 @@ func ResolveNodeID(p graphql.ResolveParams) (interface{}, error) {
 
 func ResolveNodeTypeHash(p graphql.ResolveParams) (interface{}, error) {
   return ResolveNodeResult(p, func(p graphql.ResolveParams, node NodeResult) (interface{}, error) {
-    return Hash(node.Result.NodeType), nil
+    return uint64(node.Result.NodeType), nil
   })
 }

gql_test.go

@@ -21,7 +21,7 @@ import (
 func TestGQLServer(t *testing.T) {
   ctx := logTestContext(t, []string{"test", "gql", "policy", "pending"})
 
-  TestNodeType := NodeType("TEST")
+  TestNodeType := NewNodeType("TEST")
   err := ctx.RegisterNodeType(TestNodeType, []ExtType{LockableExtType})
   fatalErr(t, err)
 
@@ -30,33 +30,33 @@ func TestGQLServer(t *testing.T) {
   gql_id := KeyID(pub)
 
   group_policy_1 := NewAllNodesPolicy(Tree{
-    ReadSignalType.String(): Tree{
-      GroupExtType.String(): Tree{
-        "members": Tree{},
+    uint64(ReadSignalType): Tree{
+      uint64(GroupExtType): Tree{
+        Hash(FieldNameBase, "members"): Tree{},
       },
     },
-    ReadResultSignalType.String(): nil,
-    ErrorSignalType.String(): nil,
+    uint64(ReadResultSignalType): nil,
+    uint64(ErrorSignalType): nil,
   })
 
   group_policy_2 := NewMemberOfPolicy(map[NodeID]Tree{
     gql_id: Tree{
-      LinkSignalType.String(): nil,
-      LockSignalType.String(): nil,
-      StatusSignalType.String(): nil,
-      ReadSignalType.String(): nil,
+      uint64(LinkSignalType): nil,
+      uint64(LockSignalType): nil,
+      uint64(StatusSignalType): nil,
+      uint64(ReadSignalType): nil,
     },
   })
 
   user_policy_1 := NewAllNodesPolicy(Tree{
-    ReadResultSignalType.String(): nil,
-    ErrorSignalType.String(): nil,
+    uint64(ReadResultSignalType): nil,
+    uint64(ErrorSignalType): nil,
   })
 
   user_policy_2 := NewMemberOfPolicy(map[NodeID]Tree{
     gql_id: Tree{
-      LinkSignalType.String(): nil,
-      ReadSignalType.String(): nil,
+      uint64(LinkSignalType): nil,
+      uint64(ReadSignalType): nil,
     },
   })
 
@@ -80,8 +80,8 @@ func TestGQLServer(t *testing.T) {
   ctx.Log.Logf("test", "GQL:  %s", gql.ID)
   ctx.Log.Logf("test", "NODE: %s", n1.ID)
 
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, StatusSignalType, func(sig *IDStringSignal) bool {
-    return sig.Str == "server_started"
+  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
+    return sig.Status == "server_started"
   })
   fatalErr(t, err)
 
@@ -107,7 +107,9 @@ func TestGQLServer(t *testing.T) {
     },
   }
 
-  auth_username := base64.StdEncoding.EncodeToString(n1.ID.Serialize())
+  n1_id_bytes, err := n1.ID.MarshalBinary()
+  fatalErr(t, err)
+  auth_username := base64.StdEncoding.EncodeToString(n1_id_bytes)
   key_bytes, err := x509.MarshalPKCS8PrivateKey(n1.Key)
   fatalErr(t, err)
   auth_password := base64.StdEncoding.EncodeToString(key_bytes)
@@ -196,11 +198,11 @@ func TestGQLServer(t *testing.T) {
   SubGQL(sub_1)
 
   msgs := Messages{}
-  msgs = msgs.Add(gql.ID, gql.Key, &StopSignal, gql.ID)
+  msgs = msgs.Add(ctx, gql.ID, gql.Key, NewStopSignal(), gql.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, StatusSignalType, func(sig *IDStringSignal) bool {
-    return sig.Str == "stopped"
+  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
+    return sig.Status == "stopped"
   })
   fatalErr(t, err)
 }
@@ -208,7 +210,7 @@ func TestGQLServer(t *testing.T) {
 func TestGQLDB(t *testing.T) {
   ctx := logTestContext(t, []string{"test"})
 
-  TestUserNodeType := NodeType("TEST_USER")
+  TestUserNodeType := NewNodeType("TEST_USER")
   err := ctx.RegisterNodeType(TestUserNodeType, []ExtType{})
   fatalErr(t, err)
   u1 := NewNode(ctx, nil, TestUserNodeType, 10, nil)
@@ -225,33 +227,31 @@ func TestGQLDB(t *testing.T) {
   ctx.Log.Logf("test", "GQL_ID: %s", gql.ID)
 
   msgs := Messages{}
-  msgs = msgs.Add(gql.ID, gql.Key, &StopSignal, gql.ID)
+  msgs = msgs.Add(ctx, gql.ID, gql.Key, NewStopSignal(), gql.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, StatusSignalType, func(sig *IDStringSignal) bool {
-    return sig.Str == "stopped" && sig.NodeID == gql.ID
+  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
+    return sig.Status == "stopped" && sig.Source == gql.ID
   })
   fatalErr(t, err)
 
-  ser1, err := gql.Serialize()
-  ser2, err := u1.Serialize()
-  ser3, err := StopSignal.Serialize()
+  ser1, err := gql.Serialize(ctx)
+  ser2, err := u1.Serialize(ctx)
   ctx.Log.Logf("test", "SER_1: \n%s\n\n", ser1)
   ctx.Log.Logf("test", "SER_2: \n%s\n\n", ser2)
-  ctx.Log.Logf("test", "SER_3: \n%s\n\n", ser3)
 
   // Clear all loaded nodes from the context so it loads them from the database
-  ctx.Nodes = map[NodeID]*Node{}
+  ctx.nodeMap = map[NodeID]*Node{}
   gql_loaded, err := LoadNode(ctx, gql.ID)
   fatalErr(t, err)
-  listener_ext, err = GetExt[*ListenerExt](gql_loaded)
+  listener_ext, err = GetExt[*ListenerExt](gql_loaded, GQLExtType)
   fatalErr(t, err)
   msgs = Messages{}
-  msgs = msgs.Add(gql_loaded.ID, gql_loaded.Key, &StopSignal, gql_loaded.ID)
+  msgs = msgs.Add(ctx, gql_loaded.ID, gql_loaded.Key, NewStopSignal(), gql_loaded.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
-  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, StatusSignalType, func(sig *IDStringSignal) bool {
-    return sig.Str == "stopped" && sig.NodeID == gql_loaded.ID
+  _, err = WaitForSignal(listener_ext.Chan, 100*time.Millisecond, func(sig *StatusSignal) bool {
+    return sig.Status == "stopped" && sig.Source == gql_loaded.ID
   })
   fatalErr(t, err)
 }

gql_types.go

@@ -16,10 +16,10 @@ func AddNodeFields(object *graphql.Object) {
   })
 }
 
-func NewGQLNodeType(node_type NodeType, interfaces []*graphql.Interface, init func(*Type)) *Type {
+func NewGQLNodeType(gql_name string, node_type NodeType, interfaces []*graphql.Interface, init func(*Type)) *Type {
   var gql Type
   gql.Type = graphql.NewObject(graphql.ObjectConfig{
-    Name: string(node_type),
+    Name: gql_name,
     Interfaces: interfaces,
     IsTypeOf: func(p graphql.IsTypeOfParams) bool {
       node, ok := p.Value.(NodeResult)

graph_test.go

@@ -6,7 +6,7 @@ import (
   badger "github.com/dgraph-io/badger/v3"
 )
 
-const SimpleListenerNodeType = NodeType("SIMPLE_LISTENER")
+var SimpleListenerNodeType = NewNodeType("SIMPLE_LISTENER")
 
 func NewSimpleListener(ctx *Context, buffer int) (*Node, *ListenerExt) {
   listener_extension := NewListenerExt(buffer)

group.go

@@ -12,18 +12,10 @@ func (ext *GroupExt) Type() ExtType {
   return GroupExtType
 }
 
-func (ext *GroupExt) Serialize() ([]byte, error) {
+func (ext *GroupExt) MarshalBinary() ([]byte, error) {
   return json.Marshal(ext)
 }
 
-func (ext *GroupExt) Field(name string) interface{} {
-  return ResolveFields(ext, name, map[string]func(*GroupExt)interface{}{
-    "members": func(ext *GroupExt) interface{} {
-      return ext.Members
-    },
-  })
-}
-
 func NewGroupExt(members map[NodeID]string) *GroupExt {
   if members == nil {
     members = map[NodeID]string{}

listener.go

@@ -18,19 +18,8 @@ func NewListenerExt(buffer int) *ListenerExt {
   }
 }
 
-func (ext *ListenerExt) Field(name string) interface{} {
-  return ResolveFields(ext, name, map[string]func(*ListenerExt)interface{}{
-    "buffer": func(ext *ListenerExt) interface{} {
-      return ext.Buffer
-    },
-    "chan": func(ext *ListenerExt) interface{} {
-      return ext.Chan
-    },
-  })
-}
-
 // Simple load function, unmarshal the buffer int from json
-func (ext *ListenerExt) Deserialize(ctx *Context, data []byte) error {
+func (ext *ListenerExt) DeserializeListenerExt(ctx *Context, data []byte) error {
   err := json.Unmarshal(data, &ext.Buffer)
   ext.Chan = make(chan Signal, ext.Buffer)
   return err
@@ -51,6 +40,6 @@ func (ext *ListenerExt) Process(ctx *Context, node *Node, source NodeID, signal
   return nil
 }
 
-func (ext *ListenerExt) Serialize() ([]byte, error) {
+func (ext *ListenerExt) MarshalBinary() ([]byte, error) {
   return json.Marshal(ext.Buffer)
 }

lockable.go

@@ -1,7 +1,6 @@
 package graphvent
 
 import (
-  "encoding/binary"
   "github.com/google/uuid"
 )
 
@@ -15,119 +14,17 @@ const (
 )
 
 type LockableExt struct{
-  State ReqState
-  ReqID uuid.UUID
-  Owner *NodeID
-  PendingOwner *NodeID
-  Requirements map[NodeID]ReqState
-}
-
-func (ext *LockableExt) Field(name string) interface{} {
-  return ResolveFields(ext, name, map[string]func(*LockableExt)interface{}{
-    "owner": func(ext *LockableExt) interface{} {
-      return ext.Owner
-    },
-    "pending_owner": func(ext *LockableExt) interface{} {
-      return ext.PendingOwner
-    },
-    "requirements": func(ext *LockableExt) interface{} {
-      return ext.Requirements
-    },
-  })
+  State ReqState `ext:""`
+  ReqID *uuid.UUID `ext:""`
+  Owner *NodeID `ext:""`
+  PendingOwner *NodeID `ext:""`
+  Requirements map[NodeID]ReqState `ext:""`
 }
 
 func (ext *LockableExt) Type() ExtType {
   return LockableExtType
 }
 
-func (ext *LockableExt) Serialize() ([]byte, error) {
-  ret := make([]byte, 9 + (16 * 2) + (17 * len(ext.Requirements)))
-  if ext.Owner != nil {
-    bytes, err := ext.Owner.MarshalBinary()
-    if err != nil {
-      return nil, err
-    }
-    copy(ret[0:16], bytes)
-  }
-
-  if ext.PendingOwner != nil {
-    bytes, err := ext.PendingOwner.MarshalBinary()
-    if err != nil {
-      return nil, err
-    }
-    copy(ret[16:32], bytes)
-  }
-
-  binary.BigEndian.PutUint64(ret[32:40], uint64(len(ext.Requirements)))
-  ret[40] = byte(ext.State)
-  cur := 41
-  for req, state := range(ext.Requirements) {
-    bytes, err := req.MarshalBinary()
-    if err != nil {
-      return nil, err
-    }
-    copy(ret[cur:cur+16], bytes)
-    ret[cur+16] = byte(state)
-    cur += 17
-  }
-
-  return ret, nil
-}
-
-func (ext *LockableExt) Deserialize(ctx *Context, data []byte) error {
-  cur := 0
-  all_zero := true
-  for _, b := range(data[cur:cur+16]) {
-    if all_zero == true && b != 0x00 {
-      all_zero = false
-    }
-  }
-  if all_zero == false {
-    tmp, err := IDFromBytes(data[cur:cur+16])
-    if err != nil {
-      return err
-    }
-    ext.Owner = &tmp
-  }
-  cur += 16
-
-  all_zero = true
-  for _, b := range(data[cur:cur+16]) {
-    if all_zero == true && b != 0x00 {
-      all_zero = false
-    }
-  }
-  if all_zero == false {
-    tmp, err := IDFromBytes(data[cur:cur+16])
-    if err != nil {
-      return err
-    }
-    ext.PendingOwner = &tmp
-  }
-  cur += 16
-
-  num_requirements := int(binary.BigEndian.Uint64(data[cur:cur+8]))
-  cur += 8
-
-  ext.State = ReqState(data[cur])
-  cur += 1
-
-  if num_requirements != 0 {
-    ext.Requirements = map[NodeID]ReqState{}
-  }
-  for i := 0; i < num_requirements; i++ {
-    id, err := IDFromBytes(data[cur:cur+16])
-    if err != nil {
-      return err
-    }
-    cur += 16
-    state := ReqState(data[cur])
-    cur += 1
-    ext.Requirements[id] = state
-  }
-  return nil
-}
-
 func NewLockableExt(requirements []NodeID) *LockableExt {
   var reqs map[NodeID]ReqState = nil
   if requirements != nil {
@@ -148,21 +45,21 @@ func NewLockableExt(requirements []NodeID) *LockableExt {
 func UnlockLockable(ctx *Context, owner *Node, target NodeID) (uuid.UUID, error) {
   msgs := Messages{}
   signal := NewLockSignal("unlock")
-  msgs = msgs.Add(owner.ID, owner.Key, signal, target)
-  return signal.ID(), ctx.Send(msgs)
+  msgs = msgs.Add(ctx, owner.ID, owner.Key, signal, target)
+  return signal.Header().ID, ctx.Send(msgs)
 }
 
 // Send the signal to lock a node from itself
 func LockLockable(ctx *Context, owner *Node, target NodeID) (uuid.UUID, error) {
   msgs := Messages{}
   signal := NewLockSignal("lock")
-  msgs = msgs.Add(owner.ID, owner.Key, signal, target)
-  return signal.ID(), ctx.Send(msgs)
+  msgs = msgs.Add(ctx, owner.ID, owner.Key, signal, target)
+  return signal.Header().ID, ctx.Send(msgs)
 }
 
-func (ext *LockableExt) HandleErrorSignal(log Logger, node *Node, source NodeID, signal *ErrorSignal) Messages {
+func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) Messages {
   str := signal.Error
-  log.Logf("lockable", "ERROR_SIGNAL: %s->%s %+v", source, node.ID, str)
+  ctx.Log.Logf("lockable", "ERROR_SIGNAL: %s->%s %+v", source, node.ID, str)
 
   msgs := Messages {}
   switch str {
@@ -173,7 +70,7 @@ func (ext *LockableExt) HandleErrorSignal(log Logger, node *Node, source NodeID,
       for id, state := range(ext.Requirements) {
         if state == Locked {
           ext.Requirements[id] = Unlocking
-          msgs = msgs.Add(node.ID, node.Key, NewLockSignal("unlock"), id)
+          msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("unlock"), id)
         }
       }
     }
@@ -185,51 +82,48 @@ func (ext *LockableExt) HandleErrorSignal(log Logger, node *Node, source NodeID,
   return msgs
 }
 
-func (ext *LockableExt) HandleLinkSignal(log Logger, node *Node, source NodeID, signal *IDStringSignal) Messages {
-  id := signal.NodeID
-  action := signal.Str
+func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID, signal *LinkSignal) Messages {
   msgs := Messages {}
   if ext.State == Unlocked {
-    switch action {
+    switch signal.Action {
     case "add":
-      _, exists := ext.Requirements[id]
+      _, exists := ext.Requirements[signal.NodeID]
       if exists == true {
-        msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "already_requirement"), source)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "already_requirement"), source)
       } else {
         if ext.Requirements == nil {
           ext.Requirements = map[NodeID]ReqState{}
         }
-        ext.Requirements[id] = Unlocked
-        msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "req_added"), source)
+        ext.Requirements[signal.NodeID] = Unlocked
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "req_added"), source)
       }
     case "remove":
-      _, exists := ext.Requirements[id]
+      _, exists := ext.Requirements[signal.NodeID]
       if exists == false {
-        msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_requirement"), source)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_requirement"), source)
       } else {
-        delete(ext.Requirements, id)
-        msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "req_removed"), source)
+        delete(ext.Requirements, signal.NodeID)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "req_removed"), source)
       }
     default:
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "unknown_action"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "unknown_action"), source)
     }
   } else {
-    msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_unlocked"), source)
+    msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_unlocked"), source)
   }
   return msgs
 }
 
 // Handle a LockSignal and update the extensions owner/requirement states
-func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID, signal *StringSignal) Messages {
-  state := signal.Str
-  log.Logf("lockable", "LOCK_SIGNAL: %s->%s %+v", source, node.ID, state)
+func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) Messages {
+  ctx.Log.Logf("lockable", "LOCK_SIGNAL: %s->%s %+v", source, node.ID, signal.State)
 
   msgs := Messages{}
-  switch state {
+  switch signal.State {
   case "locked":
     state, found := ext.Requirements[source]
     if found == false {
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_requirement"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_requirement"), source)
     } else if state == Locking {
       if ext.State == Locking {
         ext.Requirements[source] = Locked
@@ -245,19 +139,19 @@ func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID,
         if locked == reqs {
           ext.State = Locked
           ext.Owner = ext.PendingOwner
-          msgs = msgs.Add(node.ID, node.Key, NewLockSignal("locked"), *ext.Owner)
+          msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("locked"), *ext.Owner)
         } else {
-          log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, reqs)
+          ctx.Log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, reqs)
         }
       } else if ext.State == AbortingLock {
         ext.Requirements[source] = Unlocking
-        msgs = msgs.Add(node.ID, node.Key, NewLockSignal("unlock"), source)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("unlock"), source)
       }
     }
   case "unlocked":
     state, found := ext.Requirements[source]
     if found == false {
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_requirement"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_requirement"), source)
     } else if state == Unlocking {
       ext.Requirements[source] = Unlocked
       reqs := 0
@@ -274,13 +168,14 @@ func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID,
         ext.State = Unlocked
         if old_state == Unlocking {
           ext.Owner = ext.PendingOwner
-          msgs = msgs.Add(node.ID, node.Key, NewLockSignal("unlocked"), *ext.Owner)
+          ext.ReqID = nil
+          msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("unlocked"), *ext.Owner)
         } else if old_state == AbortingLock {
-          msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(ext.ReqID, "not_unlocked"), *ext.PendingOwner)
+          msgs = msgs.Add(ctx ,node.ID, node.Key, NewErrorSignal(*ext.ReqID, "not_unlocked"), *ext.PendingOwner)
           ext.PendingOwner = ext.Owner
         }
       } else {
-        log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, reqs)
+        ctx.Log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, reqs)
       }
     }
   case "lock":
@@ -290,23 +185,24 @@ func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID,
         new_owner := source
         ext.PendingOwner = &new_owner
         ext.Owner = &new_owner
-        msgs = msgs.Add(node.ID, node.Key, NewLockSignal("locked"), new_owner)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("locked"), new_owner)
       } else {
         ext.State = Locking
-        ext.ReqID = signal.ID()
+        id := signal.ID
+        ext.ReqID = &id
         new_owner := source
         ext.PendingOwner = &new_owner
         for id, state := range(ext.Requirements) {
           if state != Unlocked {
-            log.Logf("lockable", "REQ_NOT_UNLOCKED_WHEN_LOCKING")
+            ctx.Log.Logf("lockable", "REQ_NOT_UNLOCKED_WHEN_LOCKING")
           }
           ext.Requirements[id] = Locking
           lock_signal := NewLockSignal("lock")
-          msgs = msgs.Add(node.ID, node.Key, lock_signal, id)
+          msgs = msgs.Add(ctx, node.ID, node.Key, lock_signal, id)
         }
       }
     } else {
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_unlocked"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_unlocked"), source)
     }
   case "unlock":
     if ext.State == Locked {
@@ -315,25 +211,26 @@ func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID,
         new_owner := source
         ext.PendingOwner = nil
         ext.Owner = nil
-        msgs = msgs.Add(node.ID, node.Key, NewLockSignal("unlocked"), new_owner)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewLockSignal("unlocked"), new_owner)
       } else if source == *ext.Owner {
         ext.State = Unlocking
-        ext.ReqID = signal.ID()
+        id := signal.ID
+        ext.ReqID = &id
         ext.PendingOwner = nil
         for id, state := range(ext.Requirements) {
           if state != Locked {
-            log.Logf("lockable", "REQ_NOT_LOCKED_WHEN_UNLOCKING")
+            ctx.Log.Logf("lockable", "REQ_NOT_LOCKED_WHEN_UNLOCKING")
           }
           ext.Requirements[id] = Unlocking
           lock_signal := NewLockSignal("unlock")
-          msgs = msgs.Add(node.ID, node.Key, lock_signal, id)
+          msgs = msgs.Add(ctx, node.ID, node.Key, lock_signal, id)
         }
       }
     } else {
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "not_locked"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_locked"), source)
     }
   default:
-    log.Logf("lockable", "LOCK_ERR: unkown state %s", state)
+    ctx.Log.Logf("lockable", "LOCK_ERR: unkown state %s", signal.State)
   }
   return msgs
 }
@@ -342,25 +239,25 @@ func (ext *LockableExt) HandleLockSignal(log Logger, node *Node, source NodeID,
 // LockSignal and LinkSignal Direct signals are processed to update the requirement/dependency/lock state
 func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) Messages {
   messages := Messages{}
-  switch signal.Direction() {
+  switch signal.Header().Direction {
   case Up:
     if ext.Owner != nil {
       if *ext.Owner != node.ID {
-        messages = messages.Add(node.ID, node.Key, signal, *ext.Owner)
+        messages = messages.Add(ctx, node.ID, node.Key, signal, *ext.Owner)
       }
     }
   case Down:
     for requirement, _ := range(ext.Requirements) {
-      messages = messages.Add(node.ID, node.Key, signal, requirement)
+      messages = messages.Add(ctx, node.ID, node.Key, signal, requirement)
     }
   case Direct:
-    switch signal.Type() {
-    case LinkSignalType:
-      messages = ext.HandleLinkSignal(ctx.Log, node, source, signal.(*IDStringSignal))
-    case LockSignalType:
-      messages = ext.HandleLockSignal(ctx.Log, node, source, signal.(*StringSignal))
-    case ErrorSignalType:
-      messages = ext.HandleErrorSignal(ctx.Log, node, source, signal.(*ErrorSignal))
+    switch sig := signal.(type) {
+    case *LinkSignal:
+      messages = ext.HandleLinkSignal(ctx, node, source, sig)
+    case *LockSignal:
+      messages = ext.HandleLockSignal(ctx, node, source, sig)
+    case *ErrorSignal:
+      messages = ext.HandleErrorSignal(ctx, node, source, sig)
     default:
     }
   default:

lockable_test.go

@@ -7,7 +7,7 @@ import (
   "crypto/rand"
 )
 
-const TestLockableType = NodeType("TEST_LOCKABLE")
+var TestLockableType = NewNodeType("TEST_LOCKABLE")
 func lockableTestContext(t *testing.T, logs []string) *Context {
   ctx := logTestContext(t, logs)
 
@@ -43,57 +43,24 @@ func TestLink(t *testing.T) {
                )
 
   msgs := Messages{}
-  msgs = msgs.Add(l1.ID, l1.Key, NewLinkSignal("add", l2.ID), l1.ID)
+  msgs = msgs.Add(ctx, l1.ID, l1.Key, NewLinkSignal("add", l2.ID), l1.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, ErrorSignalType, func(sig *ErrorSignal) bool {
+  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, func(sig *ErrorSignal) bool {
     return sig.Error == "req_added"
   })
   fatalErr(t, err)
 
   msgs = Messages{}
-  s := NewBaseSignal("TEST", Down)
-  msgs = msgs.Add(l1.ID, l1.Key, &s, l1.ID)
+  msgs = msgs.Add(ctx, l1.ID, l1.Key, NewLinkSignal("remove", l2.ID), l1.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, "TEST", func(sig *BaseSignal) bool {
-    return sig.ID() == s.ID()
-  })
-  fatalErr(t, err)
-
-  _, err = WaitForSignal(l2_listener.Chan, time.Millisecond*10, "TEST", func(sig *BaseSignal) bool {
-    return sig.ID() == s.ID()
-  })
-  fatalErr(t, err)
-
-  msgs = Messages{}
-  msgs = msgs.Add(l1.ID, l1.Key, NewLinkSignal("remove", l2.ID), l1.ID)
-  err = ctx.Send(msgs)
-  fatalErr(t, err)
-
-  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, ErrorSignalType, func(sig *ErrorSignal) bool {
+  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, func(sig *ErrorSignal) bool {
     return sig.Error == "req_removed"
   })
   fatalErr(t, err)
-
-  msgs = Messages{}
-  s = NewBaseSignal("TEST", Down)
-  msgs = msgs.Add(l1.ID, l1.Key, &s, l1.ID)
-  err = ctx.Send(msgs)
-  fatalErr(t, err)
-
-  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, "TEST", func(sig *BaseSignal) bool {
-    return sig.ID() == s.ID()
-  })
-  fatalErr(t, err)
-
-  select {
-  case <- l2_listener.Chan:
-    t.Fatal("Recevied message on l2 after removing link")
-  default:
-  }
 }
 
 func Test10KLink(t *testing.T) {
@@ -104,7 +71,7 @@ func Test10KLink(t *testing.T) {
   listener_id := KeyID(l_pub)
   child_policy := NewPerNodePolicy(map[NodeID]Tree{
     listener_id: Tree{
-      LockSignalType.String(): nil,
+      uint64(LockSignalType): nil,
     },
   })
   NewLockable := func()(*Node) {
@@ -125,7 +92,7 @@ func Test10KLink(t *testing.T) {
   ctx.Log.Logf("test", "CREATED_10K")
 
   l_policy := NewAllNodesPolicy(Tree{
-    LockSignalType.String(): nil,
+    uint64(LockSignalType): nil,
   })
   listener := NewListenerExt(100000)
   node := NewNode(ctx, listener_key, TestLockableType, 10000,
@@ -140,14 +107,14 @@ func Test10KLink(t *testing.T) {
   _, err = LockLockable(ctx, node, node.ID)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(listener.Chan, time.Millisecond*1000, LockSignalType, func(sig *StringSignal) bool {
-    return sig.Str == "locked"
+  _, err = WaitForSignal(listener.Chan, time.Millisecond*1000, func(sig *LockSignal) bool {
+    return sig.State == "locked"
   })
   fatalErr(t, err)
 
   for _, _ = range(reqs) {
-    _, err := WaitForSignal(listener.Chan, time.Millisecond*100, LockSignalType, func(sig *StringSignal) bool {
-      return sig.Str == "locked"
+    _, err := WaitForSignal(listener.Chan, time.Millisecond*100, func(sig *LockSignal) bool {
+      return sig.State == "locked"
     })
     fatalErr(t, err)
   }
@@ -178,36 +145,36 @@ func TestLock(t *testing.T) {
   l0, l0_listener := NewLockable([]NodeID{l2.ID, l3.ID, l4.ID, l5.ID})
   l1, l1_listener := NewLockable([]NodeID{l2.ID, l3.ID, l4.ID, l5.ID})
 
-  locked := func(sig *StringSignal) bool {
-    return sig.Str == "locked"
+  locked := func(sig *LockSignal) bool {
+    return sig.State == "locked"
   }
 
-  unlocked := func(sig *StringSignal) bool {
-    return sig.Str == "unlocked"
+  unlocked := func(sig *LockSignal) bool {
+    return sig.State == "unlocked"
   }
 
   _, err := LockLockable(ctx, l0, l5.ID)
   fatalErr(t, err)
-  _, err = WaitForSignal(l0_listener.Chan, time.Millisecond*10, LockSignalType, locked)
+  _, err = WaitForSignal(l0_listener.Chan, time.Millisecond*10, locked)
   fatalErr(t, err)
 
   id, err := LockLockable(ctx, l1, l1.ID)
   fatalErr(t, err)
-  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, ErrorSignalType, func(sig *ErrorSignal) bool {
-    return sig.Error == "not_unlocked" && sig.ReqID() == id
+  _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, func(sig *ErrorSignal) bool {
+    return sig.Error == "not_unlocked" && sig.Header().ReqID == id
   })
   fatalErr(t, err)
 
   _, err = UnlockLockable(ctx, l0, l5.ID)
   fatalErr(t, err)
-  _, err = WaitForSignal(l0_listener.Chan, time.Millisecond*10, LockSignalType, unlocked)
+  _, err = WaitForSignal(l0_listener.Chan, time.Millisecond*10, unlocked)
   fatalErr(t, err)
 
   _, err = LockLockable(ctx, l1, l1.ID)
   fatalErr(t, err)
   for i := 0; i < 4; i++ {
-    _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, LockSignalType, func(sig *StringSignal) bool {
-      return sig.Str == "locked"
+    _, err = WaitForSignal(l1_listener.Chan, time.Millisecond*10, func(sig *LockSignal) bool {
+      return sig.State == "locked"
     })
     fatalErr(t, err)
   }

node.go

@@ -29,22 +29,20 @@ const (
 var (
   // Base NodeID, used as a special value
   ZeroUUID = uuid.UUID{}
-  ZeroID = NodeID{ZeroUUID}
+  ZeroID = NodeID(ZeroUUID)
 )
 
 // A NodeID uniquely identifies a Node
-type NodeID struct {
-  uuid.UUID
+type NodeID uuid.UUID
+func (id NodeID) MarshalBinary() ([]byte, error) {
+  return (uuid.UUID)(id).MarshalBinary()
 }
-
-func (id NodeID) Serialize() []byte {
-  ser, _ := id.MarshalBinary()
-  return ser
+func (id NodeID) String() string {
+  return (uuid.UUID)(id).String()
 }
-
 func IDFromBytes(bytes []byte) (NodeID, error) {
-  id, err := uuid.FromBytes(bytes[:])
-  return NodeID{id}, err
+  id, err := uuid.FromBytes(bytes)
+  return NodeID(id), err
 }
 
 // Parse an ID from a string
@@ -53,26 +51,17 @@ func ParseID(str string) (NodeID, error) {
   if err != nil {
     return NodeID{}, err
   }
-  return NodeID{id_uuid}, nil
+  return NodeID(id_uuid), nil
 }
 
 // Generate a random NodeID
 func RandID() NodeID {
-  return NodeID{uuid.New()}
-}
-
-// A Serializable has a type that can be used to map to it, and a function to serialize` the current state
-type Serializable[I comparable] interface {
-  Serialize()([]byte,error)
-  Deserialize(*Context,[]byte)error
-  Type() I
+  return NodeID(uuid.New())
 }
 
 // Extensions are data attached to nodes that process signals
 type Extension interface {
-  Serializable[ExtType]
-  Field(string)interface{}
-  Process(ctx *Context, node *Node, source NodeID, signal Signal) Messages
+  Process(*Context, *Node, NodeID, Signal) Messages
 }
 
 // A QueuedSignal is a Signal that has been Queued to trigger at a set time
@@ -130,10 +119,10 @@ const (
   Pending
 )
 
-func (node *Node) Allows(principal_id NodeID, action Tree)(map[PolicyType]Messages, RuleResult) {
+func (node *Node) Allows(ctx *Context, principal_id NodeID, action Tree)(map[PolicyType]Messages, RuleResult) {
   pends := map[PolicyType]Messages{}
   for policy_type, policy := range(node.Policies) {
-    msgs, resp := policy.Allows(principal_id, action, node)
+    msgs, resp := policy.Allows(ctx, principal_id, action, node)
     if resp == Allow {
       return nil, Allow
     } else if resp == Pending {
@@ -154,7 +143,7 @@ func (node *Node) QueueSignal(time time.Time, signal Signal) {
 func (node *Node) DequeueSignal(id uuid.UUID) error {
   idx := -1
   for i, q := range(node.SignalQueue) {
-    if q.Signal.ID() == id {
+    if q.Signal.Header().ID == id {
       idx = i
       break
     }
@@ -202,16 +191,43 @@ func runNode(ctx *Context, node *Node) {
   ctx.Log.Logf("node", "RUN_STOP: %s", node.ID)
 }
 
-func (node *Node) ReadFields(reqs map[ExtType][]string)map[ExtType]map[string]interface{} {
-  exts := map[ExtType]map[string]interface{}{}
+type StringError string
+func (err StringError) String() string {
+  return string(err)
+}
+func (err StringError) Error() string {
+  return err.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()
+  if err != nil {
+    panic(err)
+  }
+  return SerializedValue{
+    TypeStack: []uint64{uint64(ErrorType)},
+    Data: str_ser,
+  }
+}
+
+func (node *Node) ReadFields(ctx *Context, reqs map[ExtType][]string)map[ExtType]map[string]SerializedValue {
+  exts := map[ExtType]map[string]SerializedValue{}
   for ext_type, field_reqs := range(reqs) {
-    fields := map[string]interface{}{}
+    fields := map[string]SerializedValue{}
     for _, req := range(field_reqs) {
       ext, exists := node.Extensions[ext_type]
       if exists == false {
-        fields[req] = fmt.Errorf("%s does not have %s extension", node.ID, ext_type)
+        fields[req] = NewErrorField("%+v does not have %+v extension", node.ID, ext_type)
       } else {
-        fields[req] = ext.Field(req)
+        f, err := SerializeField(ctx, ext, req)
+        if err != nil {
+          fields[req] = NewErrorField(err.Error())
+        } else {
+          fields[req] = f
+        }
       }
     }
     exts[ext_type] = fields
@@ -227,21 +243,40 @@ func nodeLoop(ctx *Context, node *Node) error {
   }
 
   // Perform startup actions
-  node.Process(ctx, ZeroID, &StartSignal)
-
-  for true {
+  node.Process(ctx, ZeroID, NewStartSignal())
+  run := true
+  for run == true {
     var signal Signal
     var source NodeID
     select {
     case msg := <- node.MsgChan:
       ctx.Log.Logf("node_msg", "NODE_MSG: %s - %+v", node.ID, msg.Signal)
-      ser, err := msg.Signal.Serialize()
+      signal_type, exists := ctx.SignalTypes[reflect.TypeOf(msg.Signal).Elem()]
+      if exists == false {
+        ctx.Log.Logf("signal", "SIGNAL_NOT_REGISTERED: %+v", reflect.TypeOf(msg.Signal).Elem())
+      }
+
+      signal_ser, err := SerializeSignal(ctx, signal, signal_type)
       if err != nil {
-        ctx.Log.Logf("signal", "SIGNAL_SERIALIZE_ERR: %s - %+v", node.ID, msg.Signal)
+        ctx.Log.Logf("signal", "SIGNAL_SERIALIZE_ERR: %s - %+v", err, msg.Signal)
+      }
+      ser, err := signal_ser.MarshalBinary()
+      if err != nil {
+        ctx.Log.Logf("signal", "SIGNAL_SERIALIZE_ERR: %s - %+v", err, signal_ser)
         continue
       }
 
-      sig_data := append(msg.Dest.Serialize(), msg.Source.Serialize()...)
+      dst_id_ser, err := msg.Dest.MarshalBinary()
+      if err != nil {
+        ctx.Log.Logf("signal", "SIGNAL_DEST_ID_SER_ERR: %e", err)
+        continue
+      }
+      src_id_ser, err := msg.Source.MarshalBinary()
+      if err != nil {
+        ctx.Log.Logf("signal", "SIGNAL_SRC_ID_SER_ERR: %e", err)
+        continue
+      }
+      sig_data := append(dst_id_ser, src_id_ser...)
       sig_data = append(sig_data, ser...)
       validated := ed25519.Verify(msg.Principal, sig_data, msg.Signature)
       if validated == false {
@@ -251,26 +286,26 @@ func nodeLoop(ctx *Context, node *Node) error {
 
       princ_id := KeyID(msg.Principal)
       if princ_id != node.ID {
-        pends, resp := node.Allows(princ_id, msg.Signal.Permission())
+        pends, resp := node.Allows(ctx, princ_id, msg.Signal.Permission())
         if resp == Deny {
           ctx.Log.Logf("policy", "SIGNAL_POLICY_DENY: %s->%s - %s", princ_id, node.ID, msg.Signal.Permission())
           ctx.Log.Logf("policy", "SIGNAL_POLICY_SOURCE: %s", msg.Source)
           msgs := Messages{}
-          msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(msg.Signal.ID(), "acl denied"), msg.Source)
+          msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(msg.Signal.Header().ID, "acl denied"), msg.Source)
           ctx.Send(msgs)
           continue
         } else if resp == Pending {
           ctx.Log.Logf("policy", "SIGNAL_POLICY_PENDING: %s->%s - %s - %+v", princ_id, node.ID, msg.Signal.Permission(), pends)
-          timeout_signal := NewACLTimeoutSignal(msg.Signal.ID())
+          timeout_signal := NewACLTimeoutSignal(msg.Signal.Header().ID)
           node.QueueSignal(time.Now().Add(100*time.Millisecond), timeout_signal)
           msgs := Messages{}
           for policy_type, sigs := range(pends) {
             for _, m := range(sigs) {
               msgs = append(msgs, m)
-              node.PendingSignals[m.Signal.ID()] = PendingSignal{policy_type, false, msg.Signal.ID()}
+              node.PendingSignals[m.Signal.Header().ID] = PendingSignal{policy_type, false, msg.Signal.Header().ID}
             }
           }
-          node.PendingACLs[msg.Signal.ID()] = PendingACL{len(msgs), timeout_signal.ID(), msg.Signal.Permission(), princ_id, msgs, []Signal{}, msg.Signal, msg.Source}
+          node.PendingACLs[msg.Signal.Header().ID] = PendingACL{len(msgs), timeout_signal.ID, msg.Signal.Permission(), princ_id, msgs, []Signal{}, msg.Signal, msg.Source}
           ctx.Send(msgs)
           continue
         } else if resp == Allow {
@@ -290,7 +325,7 @@ func nodeLoop(ctx *Context, node *Node) error {
       t := node.NextSignal.Time
       i := -1
       for j, queued := range(node.SignalQueue) {
-        if queued.Signal.ID() == node.NextSignal.Signal.ID() {
+        if queued.Signal.Header().ID == node.NextSignal.Signal.Header().ID {
           i = j
           break
         }
@@ -304,26 +339,26 @@ func nodeLoop(ctx *Context, node *Node) error {
 
       node.NextSignal, node.TimeoutChan = SoonestSignal(node.SignalQueue)
       if node.NextSignal == nil {
-        ctx.Log.Logf("node", "NODE_TIMEOUT(%s) - PROCESSING %s@%s - NEXT_SIGNAL nil@%+v", node.ID, signal.Type(), t, node.TimeoutChan)
+        ctx.Log.Logf("node", "NODE_TIMEOUT(%s) - PROCESSING %+v@%s - NEXT_SIGNAL nil@%+v", node.ID, signal, t, node.TimeoutChan)
       } else {
-        ctx.Log.Logf("node", "NODE_TIMEOUT(%s) - PROCESSING %s@%s - NEXT_SIGNAL: %s@%s", node.ID, signal.Type(), t, node.NextSignal, node.NextSignal.Time)
+        ctx.Log.Logf("node", "NODE_TIMEOUT(%s) - PROCESSING %+v@%s - NEXT_SIGNAL: %s@%s", node.ID, signal, t, node.NextSignal, node.NextSignal.Time)
       }
     }
 
     ctx.Log.Logf("node", "NODE_SIGNAL_QUEUE[%s]: %+v", node.ID, node.SignalQueue)
 
-    info, waiting := node.PendingSignals[signal.ReqID()]
+    info, waiting := node.PendingSignals[signal.Header().ReqID]
     if waiting == true {
       if info.Found == false {
         info.Found = true
-        node.PendingSignals[signal.ReqID()] = info
+        node.PendingSignals[signal.Header().ReqID] = info
         ctx.Log.Logf("pending", "FOUND_PENDING_SIGNAL: %s - %s", node.ID, signal)
         req_info, exists := node.PendingACLs[info.ID]
         if exists == true {
           req_info.Counter -= 1
           req_info.Responses = append(req_info.Responses, signal)
 
-          allowed := node.Policies[info.Policy].ContinueAllows(req_info, signal)
+          allowed := node.Policies[info.Policy].ContinueAllows(ctx, req_info, signal)
           if allowed == Allow {
             ctx.Log.Logf("policy", "DELAYED_POLICY_ALLOW: %s - %s", node.ID, req_info.Signal)
             signal = req_info.Signal
@@ -337,7 +372,7 @@ func nodeLoop(ctx *Context, node *Node) error {
             ctx.Log.Logf("policy", "DELAYED_POLICY_DENY: %s - %s", node.ID, req_info.Signal)
             // Send the denied response
             msgs := Messages{}
-            msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(req_info.Signal.ID(), "ACL_DENIED"), req_info.Source)
+            msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(req_info.Signal.Header().ID, "ACL_DENIED"), req_info.Source)
             err := ctx.Send(msgs)
             if err != nil {
               ctx.Log.Logf("signal", "SEND_ERR: %s", err)
@@ -355,24 +390,19 @@ func nodeLoop(ctx *Context, node *Node) error {
       }
     }
 
-    // Handle node signals
-    if signal.Type() == StopSignalType {
+    switch sig := signal.(type) {
+    case *StopSignal:
       msgs := Messages{}
-      msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(signal.ID(), "stopped"), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(sig.ID, "stopped"), source)
+      ctx.Send(msgs)
+      node.Process(ctx, node.ID, NewStatusSignal(node.ID, "stopped"))
+      run = false
+    case *ReadSignal:
+      result := node.ReadFields(ctx, sig.Extensions)
+      msgs := Messages{}
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewReadResultSignal(sig.ID, node.ID, node.Type, result), source)
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(sig.ID, "read_done"), source)
       ctx.Send(msgs)
-      node.Process(ctx, node.ID, NewStatusSignal("stopped", node.ID))
-      break
-    } else if signal.Type() == ReadSignalType {
-      read_signal, ok := signal.(*ReadSignal)
-      if ok == false {
-        ctx.Log.Logf("signal", "READ_SIGNAL: bad cast %+v", signal)
-      } else {
-        result := node.ReadFields(read_signal.Extensions)
-        msgs := Messages{}
-        msgs = msgs.Add(node.ID, node.Key, NewReadResultSignal(read_signal.ID(), node.ID, node.Type, result), source)
-        msgs = msgs.Add(node.ID, node.Key, NewErrorSignal(read_signal.ID(), "read_done"), source)
-        ctx.Send(msgs)
-      }
     }
 
     node.Process(ctx, source, signal)
@@ -401,8 +431,8 @@ type Message struct {
 }
 
 type Messages []*Message
-func (msgs Messages) Add(source NodeID, principal ed25519.PrivateKey, signal Signal, dest NodeID) Messages {
-  msg, err := NewMessage(dest, source, principal, signal)
+func (msgs Messages) Add(ctx *Context, source NodeID, principal ed25519.PrivateKey, signal Signal, dest NodeID) Messages {
+  msg, err := NewMessage(ctx, dest, source, principal, signal)
   if err != nil {
     panic(err)
   } else {
@@ -411,13 +441,31 @@ func (msgs Messages) Add(source NodeID, principal ed25519.PrivateKey, signal Sig
   return msgs
 }
 
-func NewMessage(dest NodeID, source NodeID, principal ed25519.PrivateKey, signal Signal) (*Message, error) {
-  ser, err := signal.Serialize()
+func NewMessage(ctx *Context, dest NodeID, source NodeID, principal ed25519.PrivateKey, signal Signal) (*Message, error) {
+  signal_type, exists := ctx.SignalTypes[reflect.TypeOf(signal)]
+  if exists == false {
+    return nil, fmt.Errorf("Cannot put %+v in a message, not a known signal type", reflect.TypeOf(signal))
+  }
+
+  signal_ser, err := SerializeSignal(ctx, signal, signal_type)
+  if err != nil {
+    return nil, err
+  }
+
+  ser, err := signal_ser.MarshalBinary()
   if err != nil {
     return nil, err
   }
 
-  sig_data := append(dest.Serialize(), source.Serialize()...)
+  dest_ser, err := dest.MarshalBinary()
+  if err != nil {
+    return nil, err
+  }
+  source_ser, err := source.MarshalBinary()
+  if err != nil {
+    return nil, err
+  }
+  sig_data := append(dest_ser, source_ser...)
   sig_data = append(sig_data, ser...)
 
   sig, err := principal.Sign(rand.Reader, sig_data, crypto.Hash(0))
@@ -435,7 +483,7 @@ func NewMessage(dest NodeID, source NodeID, principal ed25519.PrivateKey, signal
 }
 
 func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
-  ctx.Log.Logf("node_process", "PROCESSING MESSAGE: %s - %+v", node.ID, signal.Type())
+  ctx.Log.Logf("node_process", "PROCESSING MESSAGE: %s - %+v", node.ID, signal)
   messages := Messages{}
   for ext_type, ext := range(node.Extensions) {
     ctx.Log.Logf("node_process", "PROCESSING_EXTENSION: %s/%s", node.ID, ext_type)
@@ -449,120 +497,86 @@ func (node *Node) Process(ctx *Context, source NodeID, signal Signal) error {
   return ctx.Send(messages)
 }
 
-func GetCtx[T Extension, C any](ctx *Context) (C, error) {
-  var zero T
+func GetCtx[T Extension, C any](ctx *Context, ext_type ExtType) (C, error) {
   var zero_ctx C
-  ext_type := zero.Type()
-  type_hash := Hash(ext_type)
-  ext_info, ok := ctx.Extensions[type_hash]
+  ext_info, ok := ctx.Extensions[ext_type]
   if ok == false {
-    return zero_ctx, fmt.Errorf("%s is not an extension in ctx", ext_type)
+    return zero_ctx, fmt.Errorf("%+v is not an extension in ctx", ext_type)
   }
 
   ext_ctx, ok := ext_info.Data.(C)
   if ok == false {
-    return zero_ctx, fmt.Errorf("context for %s is %+v, not %+v", ext_type, reflect.TypeOf(ext_info.Data), reflect.TypeOf(zero))
+    return zero_ctx, fmt.Errorf("context for %+v is %+v, not %+v", ext_type, reflect.TypeOf(ext_info.Data), reflect.TypeOf(zero_ctx))
   }
 
   return ext_ctx, nil
 }
 
-func GetExt[T Extension](node *Node) (T, error) {
+func GetExt[T Extension](node *Node, ext_type ExtType) (T, error) {
   var zero T
-  ext_type := zero.Type()
   ext, exists := node.Extensions[ext_type]
   if exists == false {
-    return zero, fmt.Errorf("%s does not have %s extension - %+v", node.ID, ext_type, node.Extensions)
+    return zero, fmt.Errorf("%+v does not have %+v extension - %+v", node.ID, ext_type, node.Extensions)
   }
 
   ret, ok := ext.(T)
   if ok == false {
-    return zero, fmt.Errorf("%s in %s is wrong type(%+v), expecting %+v", ext_type, node.ID, reflect.TypeOf(ext), reflect.TypeOf(zero))
+    return zero, fmt.Errorf("%+v in %+v is wrong type(%+v), expecting %+v", ext_type, node.ID, reflect.TypeOf(ext), reflect.TypeOf(zero))
   }
 
   return ret, nil
 }
 
-func (node *Node) Serialize() ([]byte, error) {
-  extensions := make([]ExtensionDB, len(node.Extensions))
-  qsignals := make([]QSignalDB, len(node.SignalQueue))
-  policies := make([]PolicyDB, len(node.Policies))
+func (node *Node) Serialize(ctx *Context) (SerializedValue, error) {
+  if node == nil {
+    return SerializedValue{}, fmt.Errorf("Cannot serialize nil Node")
+  }
+
+  node_bytes := make([]byte, 8 * 3)
+  binary.BigEndian.PutUint64(node_bytes[0:8], uint64(len(node.Extensions)))
+  binary.BigEndian.PutUint64(node_bytes[8:16], uint64(len(node.Policies)))
+  binary.BigEndian.PutUint64(node_bytes[16:24], uint64(len(node.SignalQueue)))
 
   key_bytes, err := x509.MarshalPKCS8PrivateKey(node.Key)
   if err != nil {
-    return nil, err
+    return SerializedValue{}, err
   }
 
-  node_db := NodeDB{
-    Header: NodeDBHeader{
-      Magic: NODE_DB_MAGIC,
-      TypeHash: Hash(node.Type),
-      KeyLength: uint32(len(key_bytes)),
-      BufferSize: node.BufferSize,
-      NumExtensions: uint32(len(extensions)),
-      NumPolicies: uint32(len(policies)),
-      NumQueuedSignals: uint32(len(node.SignalQueue)),
-    },
-    Extensions: extensions,
-    Policies: policies,
-    QueuedSignals: qsignals,
-    KeyBytes: key_bytes,
+  key_val := SerializedValue{
+    TypeStack: []uint64{uint64(NodeKeyType)},
+    Data: key_bytes,
+  }
+  key_ser, err := key_val.MarshalBinary()
+  if err != nil {
+    return SerializedValue{}, err
   }
+  node_bytes = append(node_bytes, key_ser...)
 
-  i := 0
-  for ext_type, info := range(node.Extensions) {
-    ser, err := info.Serialize()
+  for ext_type, ext := range(node.Extensions) {
+    ctx.Log.Logf("serialize", "SERIALIZING_EXTENSION: %+v", ext)
+    ext_ser, err := SerializeExtension(ctx, ext, ext_type)
     if err != nil {
-      return nil, err
-    }
-    node_db.Extensions[i] = ExtensionDB{
-      Header: ExtensionDBHeader{
-        TypeHash: Hash(ext_type),
-        Length: uint64(len(ser)),
-      },
-      Data: ser,
+      return SerializedValue{}, err
     }
-    i += 1
-  }
-
-  for i, qsignal := range(node.SignalQueue) {
-    ser, err := qsignal.Signal.Serialize()
+    ext_bytes, err := ext_ser.MarshalBinary()
     if err != nil {
-      return nil, err
+      return SerializedValue{}, err
     }
 
-    node_db.QueuedSignals[i] = QSignalDB{
-      QSignalDBHeader{
-        qsignal.Time,
-        Hash(qsignal.Signal.Type()),
-        uint64(len(ser)),
-      },
-      ser,
-    }
+    node_bytes = append(node_bytes, ext_bytes...)
   }
 
-  i = 0
-  for _, policy := range(node.Policies) {
-    ser, err := policy.Serialize()
-    if err != nil {
-      return nil, err
-    }
-
-    node_db.Policies[i] = PolicyDB{
-      PolicyDBHeader{
-        Hash(policy.Type()),
-        uint64(len(ser)),
-      },
-      ser,
-    }
+  node_value := SerializedValue{
+    TypeStack: []uint64{uint64(node.Type)},
+    Data: node_bytes,
   }
 
-  return node_db.Serialize(), nil
+  return node_value, nil
 }
 
 func KeyID(pub ed25519.PublicKey) NodeID {
-  str := uuid.NewHash(sha512.New(), ZeroUUID, pub, 3)
-  return NodeID{str}
+  id := uuid.NewHash(sha512.New(), ZeroUUID, pub, 3)
+  return NodeID(id)
 }
 
 // Create a new node in memory and start it's event loop
@@ -584,24 +598,28 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
     panic("Attempted to create an existing node")
   }
 
-  def, exists := ctx.Types[Hash(node_type)]
+  def, exists := ctx.Nodes[node_type]
   if exists == false {
     panic("Node type %s not registered in Context")
   }
 
   ext_map := map[ExtType]Extension{}
   for _, ext := range(extensions) {
-    _, exists := ext_map[ext.Type()]
+    ext_type, exists := ctx.ExtensionTypes[reflect.TypeOf(ext)]
+    if exists == false {
+      panic(fmt.Sprintf("%+v is not a known Extension", reflect.TypeOf(ext)))
+    }
+    _, exists = ext_map[ext_type]
     if exists == true {
       panic("Cannot add the same extension to a node twice")
     }
-    ext_map[ext.Type()] = ext
+    ext_map[ext_type] = ext
   }
 
   for _, required_ext := range(def.Extensions) {
     _, exists := ext_map[required_ext]
     if exists == false {
-      panic(fmt.Sprintf("%s requires %s", node_type, required_ext))
+      panic(fmt.Sprintf("%+v requires %+v", node_type, required_ext))
     }
   }
 
@@ -610,9 +628,9 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
   }
 
   default_policy := NewAllNodesPolicy(Tree{
-    ErrorSignalType.String(): nil,
-    ReadResultSignalType.String(): nil,
-    StatusSignalType.String(): nil,
+    uint64(ErrorSignalType): nil,
+    uint64(ReadResultSignalType): nil,
+    uint64(StatusSignalType): nil,
   })
 
   all_nodes_policy, exists := policies[AllNodesPolicyType]
@@ -642,252 +660,32 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
     panic(err)
   }
 
-  node.Process(ctx, ZeroID, &NewSignal)
+  node.Process(ctx, ZeroID, NewCreateSignal())
 
   go runNode(ctx, node)
 
   return node
 }
 
-type PolicyDBHeader struct {
-  TypeHash uint64
-  Length uint64
-}
-
-type PolicyDB struct {
-  Header PolicyDBHeader
-  Data []byte
-}
-
-type QSignalDBHeader struct {
-  Time time.Time
-  TypeHash uint64
-  Length uint64
-}
-
-type QSignalDB struct {
-  Header QSignalDBHeader
-  Data []byte
-}
-
-type ExtensionDBHeader struct {
-  TypeHash uint64
-  Length uint64
-}
-
-type ExtensionDB struct {
-  Header ExtensionDBHeader
-  Data []byte
-}
-
-// A DBHeader is parsed from the first NODE_DB_HEADER_LEN bytes of a serialized DB node
-type NodeDBHeader struct {
-  Magic uint32
-  NumExtensions uint32
-  NumPolicies uint32
-  NumQueuedSignals uint32
-  BufferSize uint32
-  KeyLength uint32
-  TypeHash uint64
-}
-
-type NodeDB struct {
-  Header NodeDBHeader
-  Extensions []ExtensionDB
-  Policies []PolicyDB
-  QueuedSignals []QSignalDB
-  KeyBytes []byte
-}
-
-//TODO: add size safety checks
-func NewNodeDB(data []byte) (NodeDB, error) {
-  var zero NodeDB
-
-  ptr := 0
-
-  magic := binary.BigEndian.Uint32(data[0:4])
-  num_extensions := binary.BigEndian.Uint32(data[4:8])
-  num_policies := binary.BigEndian.Uint32(data[8:12])
-  num_queued_signals := binary.BigEndian.Uint32(data[12:16])
-  buffer_size := binary.BigEndian.Uint32(data[16:20])
-  key_length := binary.BigEndian.Uint32(data[20:24])
-  node_type_hash := binary.BigEndian.Uint64(data[24:32])
-
-  ptr += NODE_DB_HEADER_LEN
-
-  if magic != NODE_DB_MAGIC {
-    return zero, fmt.Errorf("header has incorrect magic 0x%x", magic)
-  }
-
-  key_bytes := make([]byte, key_length)
-  n := copy(key_bytes, data[ptr:(ptr+int(key_length))])
-  if n != int(key_length) {
-    return zero, fmt.Errorf("not enough key bytes: %d", n)
-  }
-
-  ptr += int(key_length)
-
-  extensions := make([]ExtensionDB, num_extensions)
-  for i, _ := range(extensions) {
-    cur := data[ptr:]
-
-    type_hash := binary.BigEndian.Uint64(cur[0:8])
-    length := binary.BigEndian.Uint64(cur[8:16])
-
-    data_start := uint64(EXTENSION_DB_HEADER_LEN)
-    data_end := data_start + length
-    ext_data := cur[data_start:data_end]
-
-    extensions[i] = ExtensionDB{
-      Header: ExtensionDBHeader{
-        TypeHash: type_hash,
-        Length: length,
-      },
-      Data: ext_data,
-    }
-
-    ptr += int(EXTENSION_DB_HEADER_LEN + length)
-  }
-
-  policies := make([]PolicyDB, num_policies)
-  for i, _ := range(policies) {
-    cur := data[ptr:]
-    type_hash := binary.BigEndian.Uint64(cur[0:8])
-    length := binary.BigEndian.Uint64(cur[8:16])
-
-    data_start := uint64(POLICY_DB_HEADER_LEN)
-    data_end := data_start + length
-    policy_data := cur[data_start:data_end]
-
-    policies[i] = PolicyDB{
-      PolicyDBHeader{
-        type_hash,
-        length,
-      },
-      policy_data,
-    }
-    ptr += int(POLICY_DB_HEADER_LEN + length)
-  }
-
-  queued_signals := make([]QSignalDB, num_queued_signals)
-  for i, _ := range(queued_signals) {
-    cur := data[ptr:]
-    // TODO: load a header for each with the signal type and the signal length, so that it can be deserialized and incremented
-    // Right now causes segfault because any saved signal is loaded as nil
-    unix_milli := binary.BigEndian.Uint64(cur[0:8])
-    type_hash := binary.BigEndian.Uint64(cur[8:16])
-    signal_size := binary.BigEndian.Uint64(cur[16:24])
-
-    signal_data := cur[QSIGNAL_DB_HEADER_LEN:(QSIGNAL_DB_HEADER_LEN+signal_size)]
-
-    queued_signals[i] = QSignalDB{
-      QSignalDBHeader{
-        time.UnixMilli(int64(unix_milli)),
-        type_hash,
-        signal_size,
-      },
-      signal_data,
-    }
-
-    ptr += QSIGNAL_DB_HEADER_LEN + int(signal_size)
-  }
-
-  return NodeDB{
-    Header: NodeDBHeader{
-      Magic: magic,
-      TypeHash: node_type_hash,
-      BufferSize: buffer_size,
-      KeyLength: key_length,
-      NumExtensions: num_extensions,
-      NumQueuedSignals: num_queued_signals,
-    },
-    KeyBytes: key_bytes,
-    Extensions: extensions,
-    QueuedSignals: queued_signals,
-  }, nil
-}
-
-func (header NodeDBHeader) Serialize() []byte {
-  if header.Magic != NODE_DB_MAGIC {
-    panic(fmt.Sprintf("Serializing header with invalid magic %0x", header.Magic))
-  }
-
-  ret := make([]byte, NODE_DB_HEADER_LEN)
-  binary.BigEndian.PutUint32(ret[0:4], header.Magic)
-  binary.BigEndian.PutUint32(ret[4:8], header.NumExtensions)
-  binary.BigEndian.PutUint32(ret[8:12], header.NumPolicies)
-  binary.BigEndian.PutUint32(ret[12:16], header.NumQueuedSignals)
-  binary.BigEndian.PutUint32(ret[16:20], header.BufferSize)
-  binary.BigEndian.PutUint32(ret[20:24], header.KeyLength)
-  binary.BigEndian.PutUint64(ret[24:32], header.TypeHash)
-  return ret
-}
-
-func (node NodeDB) Serialize() []byte {
-  ser := node.Header.Serialize()
-  ser = append(ser, node.KeyBytes...)
-  for _, extension := range(node.Extensions) {
-    ser = append(ser, extension.Serialize()...)
-  }
-  for _, policy := range(node.Policies) {
-    ser = append(ser, policy.Serialize()...)
-  }
-  for _, qsignal := range(node.QueuedSignals) {
-    ser = append(ser, qsignal.Serialize()...)
-  }
-
-  return ser
-}
-
-func (header QSignalDBHeader) Serialize() []byte {
-  ret := make([]byte, QSIGNAL_DB_HEADER_LEN)
-  binary.BigEndian.PutUint64(ret[0:8], uint64(header.Time.UnixMilli()))
-  binary.BigEndian.PutUint64(ret[8:16], header.TypeHash)
-  binary.BigEndian.PutUint64(ret[16:24], header.Length)
-  return ret
-}
-
-func (qsignal QSignalDB) Serialize() []byte {
-  header_bytes := qsignal.Header.Serialize()
-  return append(header_bytes, qsignal.Data...)
-}
-
-func (header ExtensionDBHeader) Serialize() []byte {
-  ret := make([]byte, EXTENSION_DB_HEADER_LEN)
-  binary.BigEndian.PutUint64(ret[0:8], header.TypeHash)
-  binary.BigEndian.PutUint64(ret[8:16], header.Length)
-  return ret
-}
-
-func (extension ExtensionDB) Serialize() []byte {
-  header_bytes := extension.Header.Serialize()
-  return append(header_bytes, extension.Data...)
-}
-
-func (header PolicyDBHeader) Serialize() []byte {
-  ret := make([]byte, POLICY_DB_HEADER_LEN)
-  binary.BigEndian.PutUint64(ret[0:8], header.TypeHash)
-  binary.BigEndian.PutUint64(ret[0:8], header.Length)
-  return ret
-}
-
-func (policy PolicyDB) Serialize() []byte {
-  header_bytes := policy.Header.Serialize()
-  return append(header_bytes, policy.Data...)
-}
-
 // Write a node to the database
 func WriteNode(ctx *Context, node *Node) error {
   ctx.Log.Logf("db", "DB_WRITE: %s", node.ID)
 
-  bytes, err := node.Serialize()
+  node_serialized, err := node.Serialize(ctx)
+  if err != nil {
+    return err
+  }
+  bytes, err := node_serialized.MarshalBinary()
   if err != nil {
     return err
   }
 
   ctx.Log.Logf("db_data", "DB_DATA: %+v", bytes)
 
-  id_bytes := node.ID.Serialize()
+  id_bytes, err := node.ID.MarshalBinary()
+  if err != nil {
+    return err
+  }
   ctx.Log.Logf("db", "DB_WRITE_ID: %+v", id_bytes)
 
   return ctx.DB.Update(func(txn *badger.Txn) error {
@@ -895,11 +693,15 @@ func WriteNode(ctx *Context, node *Node) error {
   })
 }
 
+//TODO: fix after capnp
 func LoadNode(ctx * Context, id NodeID) (*Node, error) {
   ctx.Log.Logf("db", "LOADING_NODE: %s", id)
   var bytes []byte
   err := ctx.DB.View(func(txn *badger.Txn) error {
-    id_bytes := id.Serialize()
+    id_bytes, err := id.MarshalBinary()
+    if err != nil {
+      return err
+    }
     ctx.Log.Logf("db", "DB_READ_ID: %+v", id_bytes)
     item, err := txn.Get(id_bytes)
     if err != nil {
@@ -917,137 +719,18 @@ func LoadNode(ctx * Context, id NodeID) (*Node, error) {
     return nil, err
   }
 
-  // Parse the bytes from the DB
-  node_db, err := NewNodeDB(bytes)
-  if err != nil {
-    return nil, err
-  }
-
-  policies := make(map[PolicyType]Policy, node_db.Header.NumPolicies)
-  for _, policy_db := range(node_db.Policies) {
-    policy_info, exists := ctx.Policies[policy_db.Header.TypeHash]
-    if exists == false {
-      return nil, fmt.Errorf("0x%x is not a known policy type", policy_db.Header.TypeHash)
-    }
+  num_extensions := binary.BigEndian.Uint64(bytes[0:8])
+  num_policies := binary.BigEndian.Uint64(bytes[8:16])
+  num_signals := binary.BigEndian.Uint64(bytes[16:24])
+  print(num_extensions)
+  print(num_policies)
+  print(num_signals)
 
-    policy, err := policy_info.Load(ctx, policy_db.Data)
-    if err != nil {
-      return nil, err
-    }
-
-    policies[policy_info.Type] = policy
-  }
-
-  key_raw, err := x509.ParsePKCS8PrivateKey(node_db.KeyBytes)
-  if err != nil {
-    return nil, err
-  }
-
-  var key ed25519.PrivateKey
-  switch k := key_raw.(type) {
-  case ed25519.PrivateKey:
-    key = k
-  default:
-    return nil, fmt.Errorf("Wrong type for private key loaded: %s - %s", id, reflect.TypeOf(k))
-  }
-
-  key_id := KeyID(key.Public().(ed25519.PublicKey))
-  if key_id != id {
-    return nil, fmt.Errorf("KeyID(%s) != %s", key_id, id)
-  }
-
-  node_type, known := ctx.Types[node_db.Header.TypeHash]
-  if known == false {
-    return nil, fmt.Errorf("Tried to load node %s of type 0x%x, which is not a known node type", id, node_db.Header.TypeHash)
-  }
-
-  signal_queue := make([]QueuedSignal, node_db.Header.NumQueuedSignals)
-  for i, qsignal := range(node_db.QueuedSignals) {
-    sig_info, exists := ctx.Signals[qsignal.Header.TypeHash]
-    if exists == false {
-      return nil, fmt.Errorf("0x%x is not a known signal type", qsignal.Header.TypeHash)
-    }
-
-    signal, err := sig_info.Load(ctx, qsignal.Data)
-    if err != nil {
-      return nil, err
-    }
-
-    signal_queue[i] = QueuedSignal{signal, qsignal.Header.Time}
-  }
-
-  next_signal, timeout_chan := SoonestSignal(signal_queue)
-  node := &Node{
-    Key: key,
-    ID: key_id,
-    Type: node_type.Type,
-    Extensions: map[ExtType]Extension{},
-    Policies: policies,
-    MsgChan: make(chan *Message, node_db.Header.BufferSize),
-    BufferSize: node_db.Header.BufferSize,
-    TimeoutChan: timeout_chan,
-    SignalQueue: signal_queue,
-    NextSignal: next_signal,
-  }
+  /*
   ctx.AddNode(id, node)
-
-  found_extensions := []ExtType{}
-  // Parse each of the extensions from the db
-  for _, ext_db := range(node_db.Extensions) {
-    type_hash := ext_db.Header.TypeHash
-    def, known := ctx.Extensions[type_hash]
-    if known == false {
-      return nil, fmt.Errorf("%s tried to load extension 0x%x, which is not a known extension type", id, type_hash)
-    }
-    ctx.Log.Logf("db", "DB_EXTENSION_LOADING: %s/%s", id, def.Type)
-    extension, err := def.Load(ctx, ext_db.Data)
-    if err != nil {
-      return nil, err
-    }
-    node.Extensions[def.Type] = extension
-    found_extensions = append(found_extensions, def.Type)
-    ctx.Log.Logf("db", "DB_EXTENSION_LOADED: %s/%s - %+v", id, def.Type, extension)
-  }
-
-  missing_extensions := []ExtType{}
-  for _, ext := range(node_type.Extensions) {
-    found := false
-    for _, found_ext := range(found_extensions) {
-      if found_ext == ext {
-        found = true
-        break
-      }
-    }
-    if found == false {
-      missing_extensions = append(missing_extensions, ext)
-    }
-  }
-
-  if len(missing_extensions) > 0 {
-    return nil, fmt.Errorf("DB_LOAD_MISSING_EXTENSIONS: %s - %+v - %+v", id, node_type, missing_extensions)
-  }
-
-  extra_extensions := []ExtType{}
-  for _, found_ext := range(found_extensions) {
-    found := false
-    for _, ext := range(node_type.Extensions) {
-      if ext == found_ext {
-        found = true
-        break
-      }
-    }
-    if found == false {
-      extra_extensions = append(extra_extensions, found_ext)
-    }
-  }
-
-  if len(extra_extensions) > 0 {
-    ctx.Log.Logf("db", "DB_LOAD_EXTRA_EXTENSIONS: %s - %+v - %+v", id, node_type, extra_extensions)
-  }
-
   ctx.Log.Logf("db", "DB_NODE_LOADED: %s", id)
-
   go runNode(ctx, node)
+  */
 
-  return node, nil
+  return nil, nil
 }

node_test.go

@@ -8,21 +8,21 @@ import (
 )
 
 func TestNodeDB(t *testing.T) {
-  ctx := logTestContext(t, []string{"signal", "node", "db"})
-  node_type := NodeType("test")
+  ctx := logTestContext(t, []string{"signal", "node", "db", "db_data", "serialize"})
+  node_type := NewNodeType("test")
   err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType})
   fatalErr(t, err)
 
-  node := NewNode(ctx, nil, node_type, 10, nil, NewGroupExt(nil))
+  node := NewNode(ctx, nil, node_type, 10, nil, NewGroupExt(nil), NewLockableExt(nil))
 
-  ctx.Nodes = map[NodeID]*Node{}
-  _, err = ctx.GetNode(node.ID)
+  ctx.nodeMap = map[NodeID]*Node{}
+  _, err = ctx.getNode(node.ID)
   fatalErr(t, err)
 }
 
 func TestNodeRead(t *testing.T) {
   ctx := logTestContext(t, []string{"test"})
-  node_type := NodeType("TEST")
+  node_type := NewNodeType("TEST")
   err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType, ECDHExtType})
   fatalErr(t, err)
 
@@ -38,27 +38,27 @@ func TestNodeRead(t *testing.T) {
   ctx.Log.Logf("test", "N2: %s", n2_id)
 
   n1_policy := NewPerNodePolicy(map[NodeID]Tree{
-    n2_id: Tree{
-      ReadSignalType.String(): nil,
+    n2_id: {
+      uint64(ReadSignalType): nil,
     },
   })
 
   n2_listener := NewListenerExt(10)
-  n2 := NewNode(ctx, n2_key, node_type, 10, nil, NewGroupExt(nil), NewECDHExt(), n2_listener)
+  n2 := NewNode(ctx, n2_key, node_type, 10, nil, NewGroupExt(nil), n2_listener)
 
   n1 := NewNode(ctx, n1_key, node_type, 10, map[PolicyType]Policy{
     PerNodePolicyType: &n1_policy,
-  }, NewGroupExt(nil), NewECDHExt())
+  }, NewGroupExt(nil))
 
   read_sig := NewReadSignal(map[ExtType][]string{
-    GroupExtType: []string{"members"},
+    GroupExtType: {"members"},
   })
   msgs := Messages{}
-  msgs = msgs.Add(n2.ID, n2.Key, read_sig, n1.ID)
+  msgs = msgs.Add(ctx, n2.ID, n2.Key, read_sig, n1.ID)
   err = ctx.Send(msgs)
   fatalErr(t, err)
 
-  res, err := WaitForSignal(n2_listener.Chan, 10*time.Millisecond, ReadResultSignalType, func(sig *ReadResultSignal) bool {
+  res, err := WaitForSignal(n2_listener.Chan, 10*time.Millisecond, func(sig *ReadResultSignal) bool {
     return true
   })
   fatalErr(t, err)

policy.go

@@ -1,35 +1,26 @@
 package graphvent
 
 import (
-  "encoding/json"
-)
-
-const (
-  MemberOfPolicyType = PolicyType("USER_OF")
-  RequirementOfPolicyType = PolicyType("REQUIEMENT_OF")
-  PerNodePolicyType = PolicyType("PER_NODE")
-  AllNodesPolicyType = PolicyType("ALL_NODES")
 )
 
 type Policy interface {
-  Serializable[PolicyType]
-  Allows(principal_id NodeID, action Tree, node *Node)(Messages, RuleResult)
-  ContinueAllows(current PendingACL, signal Signal)RuleResult
+  Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult)
+  ContinueAllows(ctx *Context, current PendingACL, signal Signal)RuleResult
   // Merge with another policy of the same underlying type
   Merge(Policy) Policy
   // Make a copy of this policy
   Copy() Policy
 }
 
-func (policy *AllNodesPolicy) Allows(principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
+func (policy *AllNodesPolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
   return nil, policy.Rules.Allows(action)
 }
 
-func (policy *AllNodesPolicy) ContinueAllows(current PendingACL, signal Signal) RuleResult {
+func (policy *AllNodesPolicy) ContinueAllows(ctx *Context, current PendingACL, signal Signal) RuleResult {
   return Deny
 }
 
-func (policy *PerNodePolicy) Allows(principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
+func (policy *PerNodePolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
   for id, actions := range(policy.NodeRules) {
     if id != principal_id {
       continue
@@ -39,7 +30,7 @@ func (policy *PerNodePolicy) Allows(principal_id NodeID, action Tree, node *Node
   return nil, Deny
 }
 
-func (policy *PerNodePolicy) ContinueAllows(current PendingACL, signal Signal) RuleResult {
+func (policy *PerNodePolicy) ContinueAllows(ctx *Context, current PendingACL, signal Signal) RuleResult {
   return Deny
 }
 
@@ -57,7 +48,7 @@ func NewRequirementOfPolicy(dep_rules map[NodeID]Tree) RequirementOfPolicy {
   }
 }
 
-func (policy *RequirementOfPolicy) ContinueAllows(current PendingACL, signal Signal) RuleResult {
+func (policy *RequirementOfPolicy) ContinueAllows(ctx *Context, current PendingACL, signal Signal) RuleResult {
   sig, ok := signal.(*ReadResultSignal)
   if ok == false {
     return Deny
@@ -68,7 +59,17 @@ func (policy *RequirementOfPolicy) ContinueAllows(current PendingACL, signal Sig
     return Deny
   }
 
-  requirements, ok := ext["requirements"].(map[NodeID]string)
+  reqs_ser, ok := ext["requirements"]
+  if ok == false {
+    return Deny
+  }
+
+  reqs_if, err := DeserializeValue(ctx, reqs_ser)
+  if err != nil {
+    return Deny
+  }
+
+  requirements, ok := reqs_if.(map[NodeID]ReqState)
   if ok == false {
     return Deny
   }
@@ -96,7 +97,7 @@ func NewMemberOfPolicy(group_rules map[NodeID]Tree) MemberOfPolicy {
   }
 }
 
-func (policy *MemberOfPolicy) ContinueAllows(current PendingACL, signal Signal) RuleResult {
+func (policy *MemberOfPolicy) ContinueAllows(ctx *Context, current PendingACL, signal Signal) RuleResult {
   sig, ok := signal.(*ReadResultSignal)
   if ok == false {
     return Deny
@@ -107,7 +108,17 @@ func (policy *MemberOfPolicy) ContinueAllows(current PendingACL, signal Signal)
     return Deny
   }
 
-  members, ok := group_ext_data["members"].(map[NodeID]string)
+  members_ser, ok := group_ext_data["members"]
+  if ok == false {
+    return Deny
+  }
+
+  members_if, err := DeserializeValue(ctx, members_ser)
+  if err != nil {
+    return Deny
+  }
+
+  members, ok := members_if.(map[NodeID]string)
   if ok == false {
     return Deny
   }
@@ -122,11 +133,11 @@ func (policy *MemberOfPolicy) ContinueAllows(current PendingACL, signal Signal)
 }
 
 // Send a read signal to Group to check if principal_id is a member of it
-func (policy *MemberOfPolicy) Allows(principal_id NodeID, action Tree, node *Node) (Messages, RuleResult) {
+func (policy *MemberOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node) (Messages, RuleResult) {
   msgs := Messages{}
   for id, rule := range(policy.NodeRules) {
     if id == node.ID {
-      ext, err := GetExt[*GroupExt](node)
+      ext, err := GetExt[*GroupExt](node, GroupExtType)
       if err == nil {
         for member, _ := range(ext.Members) {
           if member == principal_id {
@@ -137,7 +148,7 @@ func (policy *MemberOfPolicy) Allows(principal_id NodeID, action Tree, node *Nod
         }
       }
     } else {
-      msgs = msgs.Add(node.ID, node.Key, NewReadSignal(map[ExtType][]string{
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewReadSignal(map[ExtType][]string{
         GroupExtType: []string{"members"},
       }), id)
     }
@@ -238,22 +249,22 @@ func (policy *AllNodesPolicy) Copy() Policy {
   }
 }
 
-type Tree map[string]Tree
+type Tree map[uint64]Tree
 
 func (rule Tree) Allows(action Tree) RuleResult {
   // If the current rule is nil, it's a wildcard and any action being processed is allowed
   if rule == nil {
     return Allow
-  // If the rule isn't "allow all" but the action is "request all", deny
+    // If the rule isn't "allow all" but the action is "request all", deny
   } else if action == nil {
     return Deny
-  // If the current action has no children, it's allowed
+    // If the current action has no children, it's allowed
   } else if len(action) == 0 {
     return Allow
-  // If the current rule has no children but the action goes further, it's not allowed
+    // If the current rule has no children but the action goes further, it's not allowed
   } else if len(rule) == 0 {
     return Deny
-  // If the current rule and action have children, all the children of action must be allowed by rule
+    // If the current rule and action have children, all the children of action must be allowed by rule
   } else {
     for sub, subtree := range(action) {
       subrule, exists := rule[sub]
@@ -285,14 +296,6 @@ func (policy *PerNodePolicy) Type() PolicyType {
   return PerNodePolicyType
 }
 
-func (policy *PerNodePolicy) Serialize() ([]byte, error) {
-  return json.MarshalIndent(policy, "", "  ")
-}
-
-func (policy *PerNodePolicy) Deserialize(ctx *Context, data []byte) error {
-  return json.Unmarshal(data, policy)
-}
-
 func NewAllNodesPolicy(rules Tree) AllNodesPolicy {
   return AllNodesPolicy{
     Rules: rules,
@@ -307,15 +310,7 @@ func (policy *AllNodesPolicy) Type() PolicyType {
   return AllNodesPolicyType
 }
 
-func (policy *AllNodesPolicy) Serialize() ([]byte, error) {
-  return json.MarshalIndent(policy, "", "  ")
-}
-
-func (policy *AllNodesPolicy) Deserialize(ctx *Context, data []byte) error {
-  return json.Unmarshal(data, policy)
-}
-
 var DefaultPolicy = NewAllNodesPolicy(Tree{
-  ErrorSignalType.String(): nil,
-  ReadResultSignalType.String(): nil,
+  uint64(ErrorSignalType): nil,
+  uint64(ReadResultSignalType): nil,
 })

signal.go

@@ -1,49 +1,29 @@
 package graphvent
 
 import (
-  "time"
   "fmt"
-  "encoding/json"
-  "encoding/binary"
-  "crypto"
-  "crypto/ed25519"
-  "crypto/ecdh"
-  "crypto/rand"
-  "crypto/aes"
-  "crypto/cipher"
+  "time"
+
+  "capnproto.org/go/capnp/v3"
   "github.com/google/uuid"
+  schema "github.com/mekkanized/graphvent/signal"
 )
 
 type SignalDirection int
 const (
-  StopSignalType       = SignalType("STOP")
-  NewSignalType        = SignalType("NEW")
-  StartSignalType      = SignalType("START")
-  ErrorSignalType      = SignalType("ERROR")
-  StatusSignalType     = SignalType("STATUS")
-  LinkSignalType       = SignalType("LINK")
-  LockSignalType       = SignalType("LOCK")
-  ReadSignalType       = SignalType("READ")
-  ReadResultSignalType = SignalType("READ_RESULT")
-  ECDHSignalType       = SignalType("ECDH")
-  ECDHProxySignalType  = SignalType("ECDH_PROXY")
-  ACLTimeoutSignalType = SignalType("ACL_TIMEOUT")
-
   Up SignalDirection = iota
   Down
   Direct
 )
 
-type SignalType string
-func (signal_type SignalType) String() string { return string(signal_type) }
-func (signal_type SignalType) Prefix() string { return "SIGNAL: " }
+type SignalHeader struct {
+  Direction SignalDirection
+  ID uuid.UUID
+  ReqID uuid.UUID
+}
 
 type Signal interface {
-  Serializable[SignalType]
-  String() string
-  Direction() SignalDirection
-  ID() uuid.UUID
-  ReqID() uuid.UUID
+  Header() *SignalHeader
   Permission() Tree
 }
 
@@ -59,7 +39,7 @@ func WaitForResponse(listener chan Signal, timeout time.Duration, req_id uuid.UU
       if signal == nil {
         return nil, fmt.Errorf("LISTENER_CLOSED")
       }
-      if signal.ReqID() == req_id {
+      if signal.Header().ReqID == req_id {
         return signal, nil
       }
     case <-timeout_channel:
@@ -69,7 +49,7 @@ func WaitForResponse(listener chan Signal, timeout time.Duration, req_id uuid.UU
   return nil, fmt.Errorf("UNREACHABLE")
 }
 
-func WaitForSignal[S Signal](listener chan Signal, timeout time.Duration, signal_type SignalType, check func(S)bool) (S, error) {
+func WaitForSignal[S Signal](listener chan Signal, timeout time.Duration, check func(S)bool) (S, error) {
   var zero S
   var timeout_channel <- chan time.Time
   if timeout > 0 {
@@ -79,493 +59,396 @@ func WaitForSignal[S Signal](listener chan Signal, timeout time.Duration, signal
     select {
     case signal := <- listener:
       if signal == nil {
-        return zero, fmt.Errorf("LISTENER_CLOSED: %s", signal_type)
+        return zero, fmt.Errorf("LISTENER_CLOSED")
       }
-      if signal.Type() == signal_type {
-        sig, ok := signal.(S)
-        if ok == true {
-          if check(sig) == true {
-            return sig, nil
-          }
+      sig, ok := signal.(S)
+      if ok == true {
+        if check(sig) == true {
+          return sig, nil
         }
       }
     case <-timeout_channel:
-      return zero, fmt.Errorf("LISTENER_TIMEOUT: %s", signal_type)
+      return zero, fmt.Errorf("LISTENER_TIMEOUT")
     }
   }
   return zero, fmt.Errorf("LOOP_ENDED")
 }
 
-type BaseSignal struct {
-  SignalDirection SignalDirection `json:"direction"`
-  SignalType SignalType `json:"type"`
-  UUID uuid.UUID `json:"id"`
-  ReqUUID uuid.UUID `json:"req_uuid"`
-}
-
-func (signal *BaseSignal) ReqID() uuid.UUID {
-  return signal.ReqUUID
-}
-
-func (signal *BaseSignal) String() string {
-  ser, _ := json.Marshal(signal)
-  return string(ser)
-}
-
-func (signal *BaseSignal) Deserialize(ctx *Context, data []byte) error {
-  return json.Unmarshal(data, signal)
-}
-
-func (signal *BaseSignal) ID() uuid.UUID {
-  return signal.UUID
-}
-
-func (signal *BaseSignal) Type() SignalType {
-  return signal.SignalType
-}
-
-func (signal *BaseSignal) Permission() Tree {
-  return Tree{
-    string(signal.Type()): Tree{},
-  }
-}
-
-func (signal *BaseSignal) Direction() SignalDirection {
-  return signal.SignalDirection
-}
-
-func (signal *BaseSignal) Serialize() ([]byte, error) {
-  return json.Marshal(signal)
-}
-
-func NewBaseSignal(signal_type SignalType, direction SignalDirection) BaseSignal {
+func NewSignalHeader(direction SignalDirection) SignalHeader {
   id := uuid.New()
-  signal := BaseSignal{
-    UUID: id,
-    ReqUUID: id,
-    SignalDirection: direction,
-    SignalType: signal_type,
+  header := SignalHeader{
+    ID: id,
+    ReqID: id,
+    Direction: direction,
   }
-  return signal
+  return header
 }
 
-func NewRespSignal(id uuid.UUID, signal_type SignalType, direction SignalDirection) BaseSignal {
-  signal := BaseSignal{
-    UUID: uuid.New(),
-    ReqUUID: id,
-    SignalDirection: direction,
-    SignalType: signal_type,
+func NewRespHeader(req_id uuid.UUID, direction SignalDirection) SignalHeader {
+  header := SignalHeader{
+    ID: uuid.New(),
+    ReqID: req_id,
+    Direction: direction,
   }
-  return signal
+  return header
 }
 
-var NewSignal = NewBaseSignal(NewSignalType, Direct)
-var StartSignal = NewBaseSignal(StartSignalType, Direct)
-var StopSignal = NewBaseSignal(StopSignalType, Direct)
-
-type IDSignal struct {
-  BaseSignal
-  NodeID `json:"id"`
-}
-
-func (signal *IDSignal) Serialize() ([]byte, error) {
-  return json.Marshal(signal)
-}
-
-type StringSignal struct {
-  BaseSignal
-  Str string `json:"state"`
-}
-
-func (signal *StringSignal) String() string {
-  ser, _ := json.Marshal(signal)
-  return string(ser)
-}
-
-func (signal *StringSignal) Serialize() ([]byte, error) {
-  return json.Marshal(&signal)
-}
-
-type ErrorSignal struct {
-  BaseSignal
-  Error string
-}
+func SerializeHeader(header SignalHeader, root schema.SignalHeader) error {
+  root.SetDirection(uint8(header.Direction))
+  id_ser, err := header.ID.MarshalBinary()
+  if err != nil {
+    return err
+  }
+  root.SetId(id_ser)
 
-func (signal *ErrorSignal) String() string {
-  ser, _ := json.Marshal(signal)
-  return string(ser)
+  req_id_ser, err := header.ReqID.MarshalBinary()
+  if err != nil {
+    return err
+  }
+  root.SetReqID(req_id_ser)
+  return nil
 }
 
-func NewErrorSignal(req_id uuid.UUID, fmt_string string, args ...interface{}) Signal {
-  return &ErrorSignal{
-    NewRespSignal(req_id, ErrorSignalType, Direct),
-    fmt.Sprintf(fmt_string, args...),
+func DeserializeHeader(header schema.SignalHeader) (SignalHeader, error) {
+  id_ser, err := header.Id()
+  if err != nil {
+    return SignalHeader{}, err
+  }
+  id, err := uuid.FromBytes(id_ser)
+  if err != nil {
+    return SignalHeader{}, err
   }
-}
 
-func NewACLTimeoutSignal(req_id uuid.UUID) Signal {
-  sig := NewRespSignal(req_id, ACLTimeoutSignalType, Direct)
-  return &sig
-}
+  req_id_ser, err := header.ReqID()
+  if err != nil {
+    return SignalHeader{}, err
+  }
+  req_id, err := uuid.FromBytes(req_id_ser)
+  if err != nil {
+    return SignalHeader{}, err
+  }
 
-type IDStringSignal struct {
-  BaseSignal
-  NodeID NodeID `json:"node_id"`
-  Str string `json:"string"`
+  return SignalHeader{
+    ID: id,
+    ReqID: req_id,
+    Direction: SignalDirection(header.Direction()),
+  }, nil
 }
 
-func (signal *IDStringSignal) String() string {
-  ser, _ := json.Marshal(signal)
-  return string(ser)
+type CreateSignal struct {
+  SignalHeader
 }
 
-func (signal *IDStringSignal) Serialize() ([]byte, error) {
-  return json.Marshal(signal)
+func (signal *CreateSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
 }
-
-func NewStatusSignal(status string, source NodeID) Signal {
-  return &IDStringSignal{
-    BaseSignal: NewBaseSignal(StatusSignalType, Up),
-    NodeID: source,
-    Str: status,
+func (signal *CreateSignal) Permission() Tree {
+  return Tree{
+    uint64(CreateSignalType): nil,
   }
 }
 
-func NewLinkSignal(state string, id NodeID) Signal {
-  return &IDStringSignal{
-    BaseSignal: NewBaseSignal(LinkSignalType, Direct),
-    NodeID: id,
-    Str: state,
+func NewCreateSignal() *CreateSignal {
+  return &CreateSignal{
+    NewSignalHeader(Direct),
   }
 }
 
-func NewLockSignal(state string) Signal {
-  return &StringSignal{
-    NewBaseSignal(LockSignalType, Direct),
-    state,
-  }
+type StartSignal struct {
+  SignalHeader
 }
-
-func (signal *StringSignal) Permission() Tree {
+func (signal *StartSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
+func (signal *StartSignal) Permission() Tree {
   return Tree{
-    string(signal.Type()): Tree{
-      signal.Str: Tree{},
-    },
+    uint64(StartSignalType): nil,
   }
 }
-
-type ReadSignal struct {
-  BaseSignal
-  Extensions map[ExtType][]string `json:"extensions"`
-}
-
-func (signal *ReadSignal) Serialize() ([]byte, error) {
-  return json.Marshal(signal)
-}
-
-func NewReadSignal(exts map[ExtType][]string) *ReadSignal {
-  return &ReadSignal{
-    NewBaseSignal(ReadSignalType, Direct),
-    exts,
+func NewStartSignal() *StartSignal {
+  return &StartSignal{
+    NewSignalHeader(Direct),
   }
 }
 
-func (signal *ReadSignal) Permission() Tree {
-  ret := Tree{}
-  for ext, fields := range(signal.Extensions) {
-    field_tree := Tree{}
-    for _, field := range(fields) {
-      field_tree[field] = Tree{}
-    }
-    ret[ext.String()] = field_tree
-  }
-  return Tree{ReadSignalType.String(): ret}
+type StopSignal struct {
+  SignalHeader
 }
-
-type ReadResultSignal struct {
-  BaseSignal
-  NodeID NodeID
-  NodeType NodeType
-  Extensions map[ExtType]map[string]interface{} `json:"extensions"`
+func (signal *StopSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
 }
-
-func (signal *ReadResultSignal) Permission() Tree {
+func (signal *StopSignal) Permission() Tree {
   return Tree{
-    ReadResultSignalType.String(): Tree{},
+    uint64(StopSignalType): nil,
   }
 }
-
-func NewReadResultSignal(req_id uuid.UUID, node_id NodeID, node_type NodeType, exts map[ExtType]map[string]interface{}) Signal {
-  return &ReadResultSignal{
-    NewRespSignal(req_id, ReadResultSignalType, Direct),
-    node_id,
-    node_type,
-    exts,
+func NewStopSignal() *StopSignal {
+  return &StopSignal{
+    NewSignalHeader(Direct),
   }
 }
 
-type ECDHSignal struct {
-  StringSignal
-  Time time.Time
-  EDDSA ed25519.PublicKey
-  ECDH *ecdh.PublicKey
-  Signature []byte
-}
-
-type ECDHSignalJSON struct {
-  StringSignal
-  Time time.Time `json:"time"`
-  EDDSA []byte `json:"ecdsa_pubkey"`
-  ECDH []byte `json:"ecdh_pubkey"`
-  Signature []byte `json:"signature"`
+type ErrorSignal struct {
+  SignalHeader
+  Error string
 }
-
-func (signal *ECDHSignal) MarshalJSON() ([]byte, error) {
-  return json.Marshal(&ECDHSignalJSON{
-    StringSignal: signal.StringSignal,
-    Time: signal.Time,
-    ECDH: signal.ECDH.Bytes(),
-    EDDSA: signal.ECDH.Bytes(),
-    Signature: signal.Signature,
-  })
+func (signal *ErrorSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
 }
-
-func (signal *ECDHSignal) Serialize() ([]byte, error) {
-  return json.Marshal(signal)
-}
-
-func NewECDHReqSignal(node *Node) (Signal, *ecdh.PrivateKey, error) {
-  ec_key, err := ECDH.GenerateKey(rand.Reader)
+func (signal *ErrorSignal) MarshalBinary() ([]byte, error) {
+  arena := capnp.SingleSegment(nil)
+  msg, seg, err := capnp.NewMessage(arena)
   if err != nil {
-    return nil, nil, err
+    return nil, err
   }
 
-  now := time.Now()
-  time_bytes, err := now.MarshalJSON()
+  root, err := schema.NewRootErrorSignal(seg)
   if err != nil {
-    return nil, nil, err
+    return nil, err
   }
 
-  sig_data := append(ec_key.PublicKey().Bytes(), time_bytes...)
+  root.SetError(signal.Error)
 
-  sig, err := node.Key.Sign(rand.Reader, sig_data, crypto.Hash(0))
+  header, err := root.NewHeader()
   if err != nil {
-    return nil, nil, err
+    return nil, err
   }
 
-  return &ECDHSignal{
-    StringSignal: StringSignal{
-      BaseSignal: NewBaseSignal(ECDHSignalType, Direct),
-      Str: "req",
-    },
-    Time: now,
-    EDDSA: node.Key.Public().(ed25519.PublicKey),
-    ECDH: ec_key.PublicKey(),
-    Signature: sig,
-  }, ec_key, nil
-}
-
-const DEFAULT_ECDH_WINDOW = time.Second
-
-func NewECDHRespSignal(node *Node, req *ECDHSignal) (ECDHSignal, []byte, error) {
-  now := time.Now()
-
-  err := VerifyECDHSignal(now, req, DEFAULT_ECDH_WINDOW)
+  err = SerializeHeader(signal.SignalHeader, header)
   if err != nil {
-    return ECDHSignal{}, nil, err
+    return nil, err
   }
 
-  ec_key, err := ECDH.GenerateKey(rand.Reader)
+  return msg.Marshal()
+}
+func (signal *ErrorSignal) Deserialize(ctx *Context, data []byte) error {
+  msg, err := capnp.Unmarshal(data)
   if err != nil {
-    return ECDHSignal{}, nil, err
+    return err
   }
 
-  shared_secret, err := ec_key.ECDH(req.ECDH)
+  root, err := schema.ReadRootErrorSignal(msg)
   if err != nil {
-    return ECDHSignal{}, nil, err
+    return err
   }
 
-  time_bytes, err := now.MarshalJSON()
+  header, err := root.Header()
   if err != nil {
-    return ECDHSignal{}, nil, err
+    return err
   }
 
-  sig_data := append(ec_key.PublicKey().Bytes(), time_bytes...)
-
-  sig, err := node.Key.Sign(rand.Reader, sig_data, crypto.Hash(0))
+  signal.Error, err = root.Error()
   if err != nil {
-    return ECDHSignal{}, nil, err
-  }
-
-  return ECDHSignal{
-    StringSignal: StringSignal{
-      BaseSignal: NewBaseSignal(ECDHSignalType, Direct),
-      Str: "resp",
-    },
-    Time: now,
-    EDDSA: node.Key.Public().(ed25519.PublicKey),
-    ECDH: ec_key.PublicKey(),
-    Signature: sig,
-  }, shared_secret, nil
-}
-
-func VerifyECDHSignal(now time.Time, sig *ECDHSignal, window time.Duration) error {
-  earliest := now.Add(-window)
-  latest := now.Add(window)
-
-  if sig.Time.Compare(earliest) == -1 {
-    return fmt.Errorf("TIME_TOO_LATE: %+v", sig.Time)
-  } else if sig.Time.Compare(latest) == 1 {
-    return fmt.Errorf("TIME_TOO_EARLY: %+v", sig.Time)
+    return err
   }
-
-  time_bytes, err := sig.Time.MarshalJSON()
+  signal.SignalHeader, err = DeserializeHeader(header)
   if err != nil {
     return err
   }
 
-  sig_data := append(sig.ECDH.Bytes(), time_bytes...)
-
-  verified := ed25519.Verify(sig.EDDSA, sig_data, sig.Signature)
-  if verified == false {
-    return fmt.Errorf("Failed to verify signature")
-  }
-
   return nil
 }
-
-type ECDHProxySignal struct {
-  BaseSignal
-  Source NodeID
-  Dest NodeID
-  IV []byte
-  Data []byte
+func (signal *ErrorSignal) Permission() Tree {
+  return Tree{
+    uint64(ErrorSignalType): nil,
+  }
 }
-
-func NewECDHProxySignal(source, dest NodeID, signal Signal, shared_secret []byte) (Signal, error) {
-  if shared_secret == nil {
-    return nil, fmt.Errorf("need shared_secret")
+func NewErrorSignal(req_id uuid.UUID, fmt_string string, args ...interface{}) Signal {
+  return &ErrorSignal{
+    NewRespHeader(req_id, Direct),
+    fmt.Sprintf(fmt_string, args...),
   }
+}
 
-  aes_key, err := aes.NewCipher(shared_secret[:32])
-  if err != nil {
-    return nil, err
+type ACLTimeoutSignal struct {
+  SignalHeader
+}
+func (signal *ACLTimeoutSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
+func (signal *ACLTimeoutSignal) Permission() Tree {
+  return Tree{
+    uint64(ACLTimeoutSignalType): nil,
   }
-
-  ser, err := SerializeSignal(signal, aes_key.BlockSize())
-  if err != nil {
-    return nil, err
+}
+func NewACLTimeoutSignal(req_id uuid.UUID) *ACLTimeoutSignal {
+  sig := &ACLTimeoutSignal{
+    NewRespHeader(req_id, Direct),
   }
+  return sig
+}
 
-  iv := make([]byte, aes_key.BlockSize())
-  n, err := rand.Reader.Read(iv)
-  if err != nil {
-    return nil, err
-  } else if n != len(iv) {
-    return nil, fmt.Errorf("Not enough bytes read for IV")
+type StatusSignal struct {
+  SignalHeader
+  Source NodeID
+  Status string
+}
+func (signal *StatusSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
+func (signal *StatusSignal) Permission() Tree {
+  return Tree{
+    uint64(StatusSignalType): nil,
+  }
+}
+func NewStatusSignal(source NodeID, status string) *StatusSignal {
+  return &StatusSignal{
+    NewSignalHeader(Up),
+    source,
+    status,
   }
-
-  encrypter := cipher.NewCBCEncrypter(aes_key, iv)
-  encrypter.CryptBlocks(ser, ser)
-
-  return &ECDHProxySignal{
-    BaseSignal: NewBaseSignal(ECDHProxySignalType, Direct),
-    Source: source,
-    Dest: dest,
-    IV: iv,
-    Data: ser,
-  }, nil
 }
 
-type SignalHeader struct {
-  Magic uint32
-  TypeHash uint64
-  Length uint64
+type LinkSignal struct {
+  SignalHeader
+  NodeID
+  Action string
+}
+func (signal *LinkSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
 }
 
-const SIGNAL_SER_MAGIC uint32 = 0x753a64de
-const SIGNAL_SER_HEADER_LENGTH = 20
-func SerializeSignal(signal Signal, block_size int) ([]byte, error) {
-  signal_ser, err := signal.Serialize()
-  if err != nil {
-    return nil, err
-  }
+const (
+  LinkActionBase = "LINK_ACTION"
+  LinkActionAdd = "ADD"
+)
 
-  pad_req := 0
-  if block_size > 0 {
-    pad := block_size - ((SIGNAL_SER_HEADER_LENGTH + len(signal_ser)) % block_size)
-    if pad != block_size {
-      pad_req = pad
-    }
+func (signal *LinkSignal) Permission() Tree {
+  return Tree{
+    uint64(LinkSignalType): Tree{
+      Hash(LinkActionBase, signal.Action): nil,
+    },
   }
-
-  header := SignalHeader{
-    Magic: SIGNAL_SER_MAGIC,
-    TypeHash: Hash(signal.Type()),
-    Length: uint64(len(signal_ser) + pad_req),
+}
+func NewLinkSignal(action string, id NodeID) Signal {
+  return &LinkSignal{
+    NewSignalHeader(Direct),
+    id,
+    action,
   }
+}
 
-  ser := make([]byte, SIGNAL_SER_HEADER_LENGTH + len(signal_ser) + pad_req)
-  binary.BigEndian.PutUint32(ser[0:4], header.Magic)
-  binary.BigEndian.PutUint64(ser[4:12], header.TypeHash)
-  binary.BigEndian.PutUint64(ser[12:20], header.Length)
+type LockSignal struct {
+  SignalHeader
+  State string
+}
+func (signal *LockSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
 
-  copy(ser[SIGNAL_SER_HEADER_LENGTH:], signal_ser)
+const (
+  LockStateBase = "LOCK_STATE"
+)
 
-  return ser, nil
+func (signal *LockSignal) Permission() Tree {
+  return Tree{
+    uint64(LockSignalType): Tree{
+      Hash(LockStateBase, signal.State): nil,
+    },
+  }
 }
 
-func ParseSignal(ctx *Context, data []byte) (Signal, error) {
-  if len(data) < SIGNAL_SER_HEADER_LENGTH {
-    return nil, fmt.Errorf("data shorter than header length")
+func NewLockSignal(state string) *LockSignal {
+  return &LockSignal{
+    NewSignalHeader(Direct),
+    state,
   }
+}
 
-  header := SignalHeader{
-    Magic: binary.BigEndian.Uint32(data[0:4]),
-    TypeHash: binary.BigEndian.Uint64(data[4:12]),
-    Length: binary.BigEndian.Uint64(data[12:20]),
+type ReadSignal struct {
+  SignalHeader
+  Extensions map[ExtType][]string `json:"extensions"`
+}
+func (signal *ReadSignal) MarshalBinary() ([]byte, error) {
+  arena := capnp.SingleSegment(nil)
+  msg, seg, err := capnp.NewMessage(arena)
+  if err != nil {
+    return nil, err
   }
 
-  if header.Magic != SIGNAL_SER_MAGIC {
-    return nil, fmt.Errorf("signal magic mismatch 0x%x", header.Magic)
+  root, err := schema.NewRootReadSignal(seg)
+  if err != nil {
+    return nil, err
   }
 
-  left := len(data) - SIGNAL_SER_HEADER_LENGTH
-  if int(header.Length) != left {
-    return nil, fmt.Errorf("signal length mismatch %d/%d", header.Length, left)
+  header, err := root.NewHeader()
+  if err != nil {
+    return nil, err
   }
 
-  signal_def, exists := ctx.Signals[header.TypeHash]
-  if exists == false {
-    return nil, fmt.Errorf("0x%x is not a known signal type", header.TypeHash)
+  err = SerializeHeader(signal.SignalHeader, header)
+  if err != nil {
+    return nil, err
   }
 
-  signal, err := signal_def.Load(ctx, data[SIGNAL_SER_HEADER_LENGTH:])
+  extensions, err := root.NewExtensions(int32(len(signal.Extensions)))
   if err != nil {
     return nil, err
   }
 
-  return signal, nil
-}
+  i := 0
+  for ext_type, fields := range(signal.Extensions) {
+    extension := extensions.At(i)
+    extension.SetType(uint64(ext_type))
+    f, err := extension.NewFields(int32(len(fields)))
+    if err != nil {
+      return nil, err
+    }
 
-func ParseECDHProxySignal(ctx *Context, signal *ECDHProxySignal, shared_secret []byte) (Signal, error) {
-  if shared_secret == nil {
-    return nil, fmt.Errorf("need shared_secret")
-  }
+    for j, field := range(fields) {
+      err := f.Set(j, field)
+      if err != nil {
+        return nil, err
+      }
+    }
 
-  aes_key, err := aes.NewCipher(shared_secret[:32])
-  if err != nil {
-    return nil, err
+    i += 1
   }
 
-  decrypter := cipher.NewCBCDecrypter(aes_key, signal.IV)
-  decrypted := make([]byte, len(signal.Data))
-  decrypter.CryptBlocks(decrypted, signal.Data)
+  return msg.Marshal()
+}
+func (signal *ReadSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
 
-  wrapped_signal, err := ParseSignal(ctx, decrypted)
-  if err != nil {
-    return nil, err
+func (signal *ReadSignal) Permission() Tree {
+  ret := Tree{}
+  for ext, fields := range(signal.Extensions) {
+    field_tree := Tree{}
+    for _, field := range(fields) {
+      field_tree[Hash(FieldNameBase, field)]  = nil
+    }
+    ret[uint64(ext)] = field_tree
   }
+  return Tree{uint64(ReadSignalType): ret}
+}
+func NewReadSignal(exts map[ExtType][]string) *ReadSignal {
+  return &ReadSignal{
+    NewSignalHeader(Direct),
+    exts,
+  }
+}
 
-  return wrapped_signal, nil
+type ReadResultSignal struct {
+  SignalHeader
+  NodeID NodeID
+  NodeType NodeType
+  Extensions map[ExtType]map[string]SerializedValue
+}
+func (signal *ReadResultSignal) Header() *SignalHeader {
+  return &signal.SignalHeader
+}
+func (signal *ReadResultSignal) Permission() Tree {
+  return Tree{
+    uint64(ReadResultSignalType): nil,
+  }
 }
+func NewReadResultSignal(req_id uuid.UUID, node_id NodeID, node_type NodeType, exts map[ExtType]map[string]SerializedValue) *ReadResultSignal {
+  return &ReadResultSignal{
+    NewRespHeader(req_id, Direct),
+    node_id,
+    node_type,
+    exts,
+  }
+}
+

signal/go.mod

@@ -0,0 +1,10 @@
+module github.com/mekkanized/graphvent/signal
+
+go 1.21.0
+
+require capnproto.org/go/capnp/v3 v3.0.0-alpha-29
+
+require (
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 // indirect
+	zenhack.net/go/util v0.0.0-20230414204917-531d38494cf5 // indirect
+)

signal/signal.capnp

@@ -0,0 +1,35 @@
+using Go = import "/go.capnp";
+@0x83a311a90429ef94;
+$Go.package("signal");
+$Go.import("github.com/mekkanized/graphvent/signal");
+
+struct SignalHeader {
+  direction @0 :UInt8;
+  id @1 :Data;
+  reqID @2 :Data;
+}
+
+struct ErrorSignal {
+  header @0 :SignalHeader;
+  error @1 :Text;
+}
+
+struct LinkSignal {
+  header @0 :SignalHeader;
+  action @1 :Text;
+  id @2 :Data;
+}
+
+struct LockSignal {
+  header @0 :SignalHeader;
+  state @1 :Text;
+}
+
+struct ReadSignal {
+  header @0 :SignalHeader;
+  extensions @1 :List(Extension);
+  struct Extension {
+    type @0 :UInt64;
+    fields @1 :List(Text);
+  }
+}