Added serialization for Tree and SerializedType. Changed policies to an array instead of a map

context.go

@@ -942,6 +942,100 @@ func NewContext(db * badger.DB, log Logger) (*Context, error) {
   }
   */
 
+  err = ctx.RegisterType(reflect.TypeOf(Tree{}), TreeType, func(ctx *Context, ctx_type SerializedType, reflect_type reflect.Type, value *reflect.Value)(SerializedValue,error){
+    var data []byte
+    type_stack := []SerializedType{ctx_type}
+    if value == nil {
+      data = nil
+    } else if value.IsZero() {
+      data = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
+    } else if value.Len() == 0 {
+      data = []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
+    } else {
+      data = make([]byte, 8)
+      map_size := 0
+
+      map_iter := value.MapRange()
+      for map_iter.Next() {
+        map_size += 1
+        key_reflect := map_iter.Key()
+        elem_reflect := map_iter.Value()
+
+        key_value, err := SerializeValue(ctx, key_reflect.Type(), &key_reflect)
+        if err != nil {
+          return SerializedValue{}, err
+        }
+        elem_value, err := SerializeValue(ctx, elem_reflect.Type(), &elem_reflect)
+        if err != nil {
+          return SerializedValue{}, err
+        }
+
+        data = append(data, key_value.Data...)
+        data = append(data, elem_value.Data...)
+      }
+
+      binary.BigEndian.PutUint64(data[0:8], uint64(map_size))
+    }
+    return SerializedValue{
+      type_stack,
+      data,
+    }, nil
+  },func(ctx *Context, value SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error){
+    if value.Data == nil {
+      return reflect.TypeOf(Tree{}), nil, value, nil
+    } else if len(value.Data) < 8 {
+      return nil, nil, value, fmt.Errorf("Not enough data to deserialize Tree")
+    } else {
+      var map_size_bytes []byte
+      var err error
+      map_size_bytes, value, err = value.PopData(8)
+      if err != nil {
+        return nil, nil, value, err
+      }
+
+      map_size := binary.BigEndian.Uint64(map_size_bytes)
+      ctx.Log.Logf("serialize", "Deserializing %d elements in Tree", map_size)
+
+      if map_size == 0xFFFFFFFFFFFFFFFF {
+        reflect_type := reflect.TypeOf(Tree{})
+        reflect_value := reflect.New(reflect_type).Elem()
+        return reflect_type, &reflect_value, value, nil
+      } else if map_size == 0x00 {
+        reflect_type := reflect.TypeOf(Tree{})
+        reflect_value := reflect.MakeMap(reflect_type)
+        return reflect_type, &reflect_value, value, nil
+      } else {
+        reflect_type := reflect.TypeOf(Tree{})
+        reflect_value := reflect.MakeMap(reflect_type)
+
+        tmp_value := value
+
+        for i := 0; i < int(map_size); i += 1 {
+          tmp_value.TypeStack = append([]SerializedType{SerializedTypeSerialized, TreeType}, value.TypeStack...)
+
+          var key_value, elem_value *reflect.Value
+          var err error
+          _, key_value, tmp_value, err = DeserializeValue(ctx, tmp_value)
+          if err != nil {
+            return nil, nil, value, err
+          }
+          _, elem_value, tmp_value, err = DeserializeValue(ctx, tmp_value)
+          if err != nil {
+            return nil, nil, value, err
+          }
+          reflect_value.SetMapIndex(*key_value, *elem_value)
+        }
+
+        return reflect_type, &reflect_value, tmp_value, nil
+      }
+    }
+  })
+
+  err = ctx.RegisterType(reflect.TypeOf(SerializedType(0)), SerializedTypeSerialized, SerializeUintN(8), DeserializeUintN[SerializedType](8))
+  if err != nil {
+    return nil, err
+  }
+
   err = ctx.RegisterType(reflect.TypeOf(ExtType(0)), ExtTypeSerialized, SerializeUintN(8), DeserializeUintN[ExtType](8))
   if err != nil {
     return nil, err
@@ -1136,6 +1230,11 @@ func NewContext(db * badger.DB, log Logger) (*Context, error) {
     return nil, err
   }
 
+  err = ctx.RegisterSignal(reflect.TypeOf(SuccessSignal{}), SuccessSignalType)
+  if err != nil {
+    return nil, err
+  }
+
   err = ctx.RegisterSignal(reflect.TypeOf(ReadResultSignal{}), ReadResultSignalType)
   if err != nil {
     return nil, err

gql_test.go

@@ -65,16 +65,11 @@ func TestGQLServer(t *testing.T) {
   fatalErr(t, err)
 
   listener_ext := NewListenerExt(10)
-  n1, err := NewNode(ctx, nil, TestNodeType, 10, map[PolicyType]Policy{
-    MemberOfPolicyType: &user_policy_2,
-    AllNodesPolicyType: &user_policy_1,
-  }, NewLockableExt(nil))
+  n1, err := NewNode(ctx, nil, TestNodeType, 10, []Policy{user_policy_2, user_policy_1}, NewLockableExt(nil))
   fatalErr(t, err)
 
-  gql, err := NewNode(ctx, gql_key, GQLNodeType, 10, map[PolicyType]Policy{
-    MemberOfPolicyType: &group_policy_2,
-    AllNodesPolicyType: &group_policy_1,
-  }, NewLockableExt([]NodeID{n1.ID}), gql_ext, NewGroupExt(map[NodeID]string{
+  gql, err := NewNode(ctx, gql_key, GQLNodeType, 10, []Policy{group_policy_2, group_policy_1},
+  NewLockableExt([]NodeID{n1.ID}), gql_ext, NewGroupExt(map[NodeID]string{
     n1.ID: "user",
     gql_id: "self",
   }), listener_ext)

lockable_test.go

@@ -28,10 +28,7 @@ func TestLink(t *testing.T) {
   })
 
   l2_listener := NewListenerExt(10)
-  l2, err := NewNode(ctx, nil, TestLockableType, 10,
-                map[PolicyType]Policy{
-                  PerNodePolicyType: &policy,
-                },
+  l2, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{policy},
                   l2_listener,
                   NewLockableExt(nil),
                 )
@@ -77,10 +74,7 @@ func Test10KLink(t *testing.T) {
     },
   })
   NewLockable := func()(*Node) {
-    l, err := NewNode(ctx, nil, TestLockableType, 10,
-                  map[PolicyType]Policy{
-                    PerNodePolicyType: &child_policy,
-                  },
+    l, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{child_policy},
                   NewLockableExt(nil),
                 )
     fatalErr(t, err)
@@ -98,10 +92,7 @@ func Test10KLink(t *testing.T) {
     SerializedType(LockSignalType): nil,
   })
   listener := NewListenerExt(100000)
-  node, err := NewNode(ctx, listener_key, TestLockableType, 10000,
-                map[PolicyType]Policy{
-                  AllNodesPolicyType: &l_policy,
-                },
+  node, err := NewNode(ctx, listener_key, TestLockableType, 10000, []Policy{l_policy},
                 listener,
                 NewLockableExt(reqs),
               )
@@ -132,10 +123,7 @@ func TestLock(t *testing.T) {
 
   NewLockable := func(reqs []NodeID)(*Node, *ListenerExt) {
     listener := NewListenerExt(100)
-    l, err := NewNode(ctx, nil, TestLockableType, 10,
-                  map[PolicyType]Policy{
-                    AllNodesPolicyType: &policy,
-                  },
+    l, err := NewNode(ctx, nil, TestLockableType, 10, []Policy{policy},
                   listener,
                   NewLockableExt(reqs),
                 )

node.go

@@ -14,16 +14,6 @@ import (
   "crypto/rand"
 )
 
-const (
-  // Magic first four bytes of serialized DB content, stored big endian
-  NODE_DB_MAGIC = 0x2491df14
-  // Total length of the node database header, has magic to verify and type_hash to map to load function
-  NODE_DB_HEADER_LEN = 32
-  EXTENSION_DB_HEADER_LEN = 16
-  QSIGNAL_DB_HEADER_LEN = 24
-  POLICY_DB_HEADER_LEN = 16
-)
-
 var (
   // Base NodeID, used as a special value
   ZeroUUID = uuid.UUID{}
@@ -84,7 +74,7 @@ type PendingACL struct {
 }
 
 type PendingSignal struct {
-  Policy PolicyType
+  Policy uuid.UUID
   Found bool
   ID uuid.UUID
 }
@@ -96,7 +86,7 @@ type Node struct {
   ID NodeID
   Type NodeType `gv:"type"`
   Extensions map[ExtType]Extension `gv:"extensions"`
-  Policies map[PolicyType]Policy `gv:"policies"`
+  Policies []Policy `gv:"policies"`
 
   PendingACLs map[uuid.UUID]PendingACL `gv:"pending_acls"`
   PendingSignals map[uuid.UUID]PendingSignal `gv:"pending_signal"`
@@ -134,14 +124,14 @@ const (
   Pending
 )
 
-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) {
+func (node *Node) Allows(ctx *Context, principal_id NodeID, action Tree)(map[uuid.UUID]Messages, RuleResult) {
+  pends := map[uuid.UUID]Messages{}
+  for _, policy := range(node.Policies) {
     msgs, resp := policy.Allows(ctx, principal_id, action, node)
     if resp == Allow {
       return nil, Allow
     } else if resp == Pending {
-      pends[policy_type] = msgs
+      pends[policy.ID()] = msgs
     }
   }
   if len(pends) != 0 {
@@ -370,7 +360,18 @@ func nodeLoop(ctx *Context, node *Node) error {
           req_info.Counter -= 1
           req_info.Responses = append(req_info.Responses, signal)
 
-          allowed := node.Policies[info.Policy].ContinueAllows(ctx, req_info, signal)
+          idx := -1
+          for i, p := range(node.Policies) {
+            if p.ID() == info.Policy {
+              idx = i
+              break
+            }
+          }
+          if idx == -1 {
+            ctx.Log.Logf("policy", "PENDING_FOR_NONEXISTENT_POLICY: %s - %s", node.ID, info.Policy)
+            delete(node.PendingACLs, info.ID)
+          } else {
+            allowed := node.Policies[idx].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
@@ -401,6 +402,7 @@ func nodeLoop(ctx *Context, node *Node) error {
           }
         }
       }
+    }
 
     switch sig := signal.(type) {
     case *StopSignal:
@@ -544,7 +546,7 @@ func KeyID(pub ed25519.PublicKey) NodeID {
 }
 
 // Create a new node in memory and start it's event loop
-func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_size uint32, policies map[PolicyType]Policy, extensions ...Extension) (*Node, error) {
+func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_size uint32, policies []Policy, extensions ...Extension) (*Node, error) {
   var err error
   var public ed25519.PublicKey
   if key == nil {
@@ -586,22 +588,7 @@ func NewNode(ctx *Context, key ed25519.PrivateKey, node_type NodeType, buffer_si
     }
   }
 
-  if policies == nil {
-    policies = map[PolicyType]Policy{}
-  }
-
-  default_policy := NewAllNodesPolicy(Tree{
-    SerializedType(ErrorSignalType): nil,
-    SerializedType(ReadResultSignalType): nil,
-    SerializedType(StatusSignalType): nil,
-  })
-
-  all_nodes_policy, exists := policies[AllNodesPolicyType]
-  if exists == true {
-    policies[AllNodesPolicyType] = all_nodes_policy.Merge(&default_policy)
-  } else {
-    policies[AllNodesPolicyType] = &default_policy
-  }
+  policies = append(policies, DefaultPolicy)
 
   node := &Node{
     Key: key,

node_test.go

@@ -63,9 +63,7 @@ func TestNodeRead(t *testing.T) {
   n2, err := NewNode(ctx, n2_key, node_type, 10, nil, NewGroupExt(nil), n2_listener)
   fatalErr(t, err)
 
-  n1, err := NewNode(ctx, n1_key, node_type, 10, map[PolicyType]Policy{
-    PerNodePolicyType: &n1_policy,
-  }, NewGroupExt(nil))
+  n1, err := NewNode(ctx, n1_key, node_type, 10, []Policy{n1_policy}, NewGroupExt(nil))
   fatalErr(t, err)
 
   read_sig := NewReadSignal(map[ExtType][]string{

policy.go

@@ -1,15 +1,21 @@
 package graphvent
 
 import (
+  "github.com/google/uuid"
 )
 
 type Policy interface {
   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
+  ID() uuid.UUID
+}
+
+type PolicyHeader struct {
+  UUID uuid.UUID `gv:"uuid"`
+}
+
+func (header PolicyHeader) ID() uuid.UUID {
+  return header.UUID
 }
 
 func (policy AllNodesPolicy) Allows(ctx *Context, principal_id NodeID, action Tree, node *Node)(Messages, RuleResult) {
@@ -38,10 +44,6 @@ type RequirementOfPolicy struct {
   PerNodePolicy
 }
 
-func (policy RequirementOfPolicy) Type() PolicyType {
-  return RequirementOfPolicyType
-}
-
 func NewRequirementOfPolicy(dep_rules map[NodeID]Tree) RequirementOfPolicy {
   return RequirementOfPolicy {
     PerNodePolicy: NewPerNodePolicy(dep_rules),
@@ -87,10 +89,6 @@ type MemberOfPolicy struct {
   PerNodePolicy
 }
 
-func (policy MemberOfPolicy) Type() PolicyType {
-  return MemberOfPolicyType
-}
-
 func NewMemberOfPolicy(group_rules map[NodeID]Tree) MemberOfPolicy {
   return MemberOfPolicy{
     PerNodePolicy: NewPerNodePolicy(group_rules),
@@ -156,19 +154,6 @@ func (policy MemberOfPolicy) Allows(ctx *Context, principal_id NodeID, action Tr
   return msgs, Pending
 }
 
-func (policy MemberOfPolicy) Merge(p Policy) Policy {
-  other := p.(*MemberOfPolicy)
-  policy.NodeRules = MergeNodeRules(policy.NodeRules, other.NodeRules)
-  return policy
-}
-
-func (policy MemberOfPolicy) Copy() Policy {
-  new_rules := CopyNodeRules(policy.NodeRules)
-  return &MemberOfPolicy{
-    PerNodePolicy: NewPerNodePolicy(new_rules),
-  }
-}
-
 func CopyTree(tree Tree) Tree {
   if tree == nil {
     return nil
@@ -199,56 +184,6 @@ func MergeTrees(first Tree, second Tree) Tree {
   return ret
 }
 
-func CopyNodeRules(rules map[NodeID]Tree) map[NodeID]Tree {
-  ret := map[NodeID]Tree{}
-  for id, r := range(rules) {
-    ret[id] = r
-  }
-  return ret
-}
-
-func MergeNodeRules(first map[NodeID]Tree, second map[NodeID]Tree) map[NodeID]Tree {
-  merged := map[NodeID]Tree{}
-  for id, actions := range(first) {
-    merged[id] = actions
-  }
-  for id, actions := range(second) {
-    existing, exists := merged[id]
-    if exists {
-      merged[id] = MergeTrees(existing, actions)
-    } else {
-      merged[id] = actions
-    }
-  }
-  return merged
-}
-
-func (policy PerNodePolicy) Merge(p Policy) Policy {
-  other := p.(*PerNodePolicy)
-  policy.NodeRules = MergeNodeRules(policy.NodeRules, other.NodeRules)
-  return policy
-}
-
-func (policy PerNodePolicy) Copy() Policy {
-  new_rules := CopyNodeRules(policy.NodeRules)
-  return &PerNodePolicy{
-    NodeRules: new_rules,
-  }
-}
-
-func (policy AllNodesPolicy) Merge(p Policy) Policy {
-  other := p.(*AllNodesPolicy)
-  policy.Rules = MergeTrees(policy.Rules, other.Rules)
-  return policy
-}
-
-func (policy AllNodesPolicy) Copy() Policy {
-  new_rules := policy.Rules
-  return &AllNodesPolicy {
-    Rules: new_rules,
-  }
-}
-
 type Tree map[SerializedType]Tree
 
 func (rule Tree) Allows(action Tree) RuleResult {
@@ -278,39 +213,40 @@ func (rule Tree) Allows(action Tree) RuleResult {
   }
 }
 
+func NewPolicyHeader() PolicyHeader {
+  return PolicyHeader{
+    UUID: uuid.New(),
+  }
+}
+
 func NewPerNodePolicy(node_actions map[NodeID]Tree) PerNodePolicy {
   if node_actions == nil {
     node_actions = map[NodeID]Tree{}
   }
 
   return PerNodePolicy{
+    PolicyHeader: NewPolicyHeader(),
     NodeRules: node_actions,
   }
 }
 
 type PerNodePolicy struct {
-  NodeRules map[NodeID]Tree `json:"node_actions"`
-}
-
-func (policy PerNodePolicy) Type() PolicyType {
-  return PerNodePolicyType
+  PolicyHeader
+  NodeRules map[NodeID]Tree `gv:"node_rules"`
 }
 
 func NewAllNodesPolicy(rules Tree) AllNodesPolicy {
   return AllNodesPolicy{
+    PolicyHeader: NewPolicyHeader(),
     Rules: rules,
   }
 }
 
 type AllNodesPolicy struct {
-  Rules Tree
-}
-
-func (policy AllNodesPolicy) Type() PolicyType {
-  return AllNodesPolicyType
+  PolicyHeader
+  Rules Tree `gv:"rules"`
 }
 
 var DefaultPolicy = NewAllNodesPolicy(Tree{
-  SerializedType(ErrorSignalType): nil,
-  SerializedType(ReadResultSignalType): nil,
+  ResultType: nil,
 })

serialize.go

@@ -26,26 +26,31 @@ func Hash(base string, name string) SerializedType {
 }
 
 type SerializedType uint64
+
 func (t SerializedType) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
 
 type ExtType SerializedType
+
 func (t ExtType) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
 
 type NodeType SerializedType
+
 func (t NodeType) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
 
 type SignalType SerializedType
+
 func (t SignalType) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
 
 type PolicyType SerializedType
+
 func (t PolicyType) String() string {
   return fmt.Sprintf("0x%x", uint64(t))
 }
@@ -84,13 +89,14 @@ var (
   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")
+  ErrorSignalType      = NewSignalType("ERROR")
+  SuccessSignalType    = NewSignalType("SUCCESS")
+  ReadResultSignalType = NewSignalType("READ_RESULT")
 
   MemberOfPolicyType      = NewPolicyType("USER_OF")
   RequirementOfPolicyType = NewPolicyType("REQUIEMENT_OF")
@@ -134,6 +140,9 @@ var (
   PendingACLType       = NewSerializedType("PENDING_ACL")
   PendingSignalType    = NewSerializedType("PENDING_SIGNAL")
   TimeType             = NewSerializedType("TIME")
+  ResultType           = NewSerializedType("RESULT")
+  TreeType             = NewSerializedType("TREE")
+  SerializedTypeSerialized   = NewSerializedType("SERIALIZED_TYPE")
 )
 
 func SerializeArray(ctx *Context, ctx_type SerializedType, reflect_type reflect.Type, value *reflect.Value) (SerializedValue, error) {
@@ -164,7 +173,7 @@ func SerializeArray(ctx *Context, ctx_type SerializedType, reflect_type reflect.
   }
 }
 
-func DeserializeArray[T any](ctx *Context)(func(ctx *Context, value SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error)){
+func DeserializeArray[T any](ctx *Context) func(ctx *Context, value SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
   var zero T
   array_type := reflect.TypeOf(zero)
   array_size := array_type.Len()
@@ -198,7 +207,7 @@ func DeserializeArray[T any](ctx *Context)(func(ctx *Context, value SerializedVa
   }
 }
 
-func SerializeUintN(size int)(func(*Context,SerializedType,reflect.Type,*reflect.Value)(SerializedValue,error)){
+func SerializeUintN(size int) func(*Context, SerializedType, reflect.Type, *reflect.Value) (SerializedValue, error) {
   var fill_data func([]byte, uint64) = nil
   switch size {
   case 1:
@@ -233,7 +242,9 @@ func SerializeUintN(size int)(func(*Context,SerializedType,reflect.Type,*reflect
   }
 }
 
-func DeserializeUintN[T interface{~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64}](size int)(func(ctx *Context, value SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error)){
+func DeserializeUintN[T interface {
+  ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
+}](size int) func(ctx *Context, value SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
   var get_uint func([]byte) uint64
   switch size {
   case 1:
@@ -274,7 +285,7 @@ func DeserializeUintN[T interface{~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64}]
   }
 }
 
-func SerializeIntN(size int)(func(ctx *Context, ctx_type SerializedType, reflect_type reflect.Type, value *reflect.Value)(SerializedValue,error)){
+func SerializeIntN(size int) func(ctx *Context, ctx_type SerializedType, reflect_type reflect.Type, value *reflect.Value) (SerializedValue, error) {
   var fill_data func([]byte, int64) = nil
   switch size {
   case 1:
@@ -309,7 +320,9 @@ func SerializeIntN(size int)(func(ctx *Context, ctx_type SerializedType, reflect
   }
 }
 
-func DeserializeIntN[T interface{~int | ~int8 | ~int16 | ~int32 | ~int64}](size int)(func(ctx *Context, value SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error)){
+func DeserializeIntN[T interface {
+  ~int | ~int8 | ~int16 | ~int32 | ~int64
+}](size int) func(ctx *Context, value SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
   var get_int func([]byte) int64
   switch size {
   case 1:
@@ -373,7 +386,7 @@ var DeserializableType = reflect.TypeOf(&deserializable_zero).Elem()
 func structInfo(ctx *Context, struct_type reflect.Type) StructInfo {
   field_order := []SerializedType{}
   field_map := map[SerializedType]FieldInfo{}
-  for _, field := range(reflect.VisibleFields(struct_type)) {
+  for _, field := range reflect.VisibleFields(struct_type) {
     gv_tag, tagged_gv := field.Tag.Lookup("gv")
     if tagged_gv == false {
       continue
@@ -423,7 +436,7 @@ func structInfo(ctx *Context, struct_type reflect.Type)StructInfo{
   }
 }
 
-func SerializeStruct(ctx *Context, struct_type reflect.Type)(func(*Context,SerializedType,reflect.Type,*reflect.Value)(SerializedValue,error)){
+func SerializeStruct(ctx *Context, struct_type reflect.Type) func(*Context, SerializedType, reflect.Type, *reflect.Value) (SerializedValue, error) {
   struct_info := structInfo(ctx, struct_type)
   return func(ctx *Context, ctx_type SerializedType, reflect_type reflect.Type, value *reflect.Value) (SerializedValue, error) {
     type_stack := []SerializedType{ctx_type}
@@ -432,7 +445,7 @@ func SerializeStruct(ctx *Context, struct_type reflect.Type)(func(*Context,Seria
       data = nil
     } else {
       data = make([]byte, 8)
-      for _, field_hash := range(struct_info.FieldOrder) {
+      for _, field_hash := range struct_info.FieldOrder {
         field_hash_bytes := make([]byte, 8)
         binary.BigEndian.PutUint64(field_hash_bytes, uint64(field_hash))
         field_info := struct_info.FieldMap[field_hash]
@@ -453,7 +466,7 @@ func SerializeStruct(ctx *Context, struct_type reflect.Type)(func(*Context,Seria
   }
 }
 
-func DeserializeStruct(ctx *Context, struct_type reflect.Type)(func(*Context,SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error)){
+func DeserializeStruct(ctx *Context, struct_type reflect.Type) func(*Context, SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
   struct_info := structInfo(ctx, struct_type)
   return func(ctx *Context, value SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
     if value.Data == nil {
@@ -537,7 +550,7 @@ func SerializeInterface(ctx *Context, ctx_type SerializedType, reflect_type refl
   }, nil
 }
 
-func DeserializeInterface[T any]()(func(*Context,SerializedValue)(reflect.Type,*reflect.Value,SerializedValue,error)){
+func DeserializeInterface[T any]() func(*Context, SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
   return func(ctx *Context, value SerializedValue) (reflect.Type, *reflect.Value, SerializedValue, error) {
     var interface_zero T
     var interface_type = reflect.ValueOf(&interface_zero).Type().Elem()
@@ -641,7 +654,7 @@ func ExtField(ctx *Context, ext Extension, field_name string) (reflect.Value, er
   }
 
   ext_value := reflect.ValueOf(ext).Elem()
-  for _, field := range(reflect.VisibleFields(ext_value.Type())) {
+  for _, field := range reflect.VisibleFields(ext_value.Type()) {
     gv_tag, tagged := field.Tag.Lookup("gv")
     if tagged == true && gv_tag == field_name {
       return ext_value.FieldByIndex(field.Index), nil
@@ -665,7 +678,7 @@ func (value SerializedValue) MarshalBinary() ([]byte, error) {
   binary.BigEndian.PutUint64(data[0:8], uint64(len(value.TypeStack)))
   binary.BigEndian.PutUint64(data[8:16], uint64(len(value.Data)))
 
-  for i, t := range(value.TypeStack) {
+  for i, t := range value.TypeStack {
     type_start := (i + 2) * 8
     type_end := (i + 3) * 8
     binary.BigEndian.PutUint64(data[type_start:type_end], uint64(t))

serialize_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestSerializeBasic(t *testing.T) {
-  ctx := logTestContext(t, []string{"test"})
+  ctx := logTestContext(t, []string{"test", "serialize"})
   testSerializeComparable[string](t, ctx, "test")
   testSerializeComparable[bool](t, ctx, true)
   testSerializeComparable[float32](t, ctx, 0.05)
@@ -59,6 +59,18 @@ func TestSerializeBasic(t *testing.T) {
     12345,
     "test_string",
   })
+
+  testSerialize(t, ctx, Tree{
+    TreeType: nil,
+  })
+
+  testSerialize(t, ctx, Tree{
+    TreeType: {
+      ErrorType: Tree{},
+      MapType: nil,
+    },
+    StringType: nil,
+  })
 }
 
 type test struct {

signal.go

@@ -144,13 +144,31 @@ func NewStopSignal() *StopSignal {
   }
 }
 
+type SuccessSignal struct {
+  SignalHeader
+}
+func (signal SuccessSignal) Permission() Tree {
+  return Tree{
+    ResultType: {
+      SerializedType(SuccessSignalType): nil,
+    },
+  }
+}
+func NewSuccessSignal(req_id uuid.UUID) Signal {
+  return &SuccessSignal{
+    NewRespHeader(req_id, Direct),
+  }
+}
+
 type ErrorSignal struct {
   SignalHeader
   Error string
 }
 func (signal ErrorSignal) Permission() Tree {
   return Tree{
+    ResultType: {
       SerializedType(ErrorSignalType): nil,
+    },
   }
 }
 func NewErrorSignal(req_id uuid.UUID, fmt_string string, args ...interface{}) Signal {
@@ -275,7 +293,9 @@ type ReadResultSignal struct {
 }
 func (signal ReadResultSignal) Permission() Tree {
   return Tree{
+    ResultType: {
       SerializedType(ReadResultSignalType): nil,
+    },
   }
 }
 func NewReadResultSignal(req_id uuid.UUID, node_id NodeID, node_type NodeType, exts map[ExtType]map[string]SerializedValue) *ReadResultSignal {