diff --git a/context.go b/context.go
index 2e24869..8260391 100644
--- a/context.go
+++ b/context.go
@@ -7,9 +7,38 @@ import (
   "runtime"
 )
 
+type NodeType string
+func (node NodeType) Hash() uint64 {
+  hash := sha512.Sum512([]byte(fmt.Sprintf("NODE: %s", string(node))))
+  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
+}
+
+type PolicyType string
+func (policy PolicyType) Hash() uint64 {
+  hash := sha512.Sum512([]byte(fmt.Sprintf("POLICY: %s", string(policy))))
+  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
+}
+
+type ExtType string
+func (ext ExtType) Hash() uint64 {
+  hash := sha512.Sum512([]byte(fmt.Sprintf("EXTENSION: %s", string(ext))))
+  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
+}
+
 //Function to load an extension from bytes
 type ExtensionLoadFunc func(*Context, []byte) (Extension, error)
 
+const (
+  ACLExtType = ExtType("ACL")
+  ListenerExtType = ExtType("LISTENER")
+  LockableExtType = ExtType("LOCKABLE")
+  GQLExtType = ExtType("GQL")
+  GroupExtType = ExtType("GROUP")
+  ECDHExtType = ExtType("ECDH")
+
+  GQLNodeType = NodeType("GQL")
+)
+
 // Information about a registered extension
 type ExtensionInfo struct {
   Load ExtensionLoadFunc
@@ -101,6 +130,13 @@ func (ctx *Context) GetNode(id NodeID) (*Node, error) {
   return target, nil
 }
 
+// Stop every running loop
+func (ctx *Context) Stop() {
+  for _, node := range(ctx.Nodes) {
+    node.MsgChan <- Msg{ZeroID, StopSignal}
+  }
+}
+
 // Route a Signal to dest. Currently only local context routing is supported
 func (ctx *Context) Send(source NodeID, dest NodeID, signal Signal) error {
   target, err := ctx.GetNode(dest)
diff --git a/gql.go b/gql.go
index 0692954..d9150d5 100644
--- a/gql.go
+++ b/gql.go
@@ -30,7 +30,6 @@ import (
   "encoding/pem"
 )
 
-const GQLNodeType = NodeType("GQL")
 
 type AuthReqJSON struct {
   Time time.Time `json:"time"`
@@ -817,7 +816,6 @@ func (ext *GQLExt) Process(context *Context, princ_id NodeID, node *Node, signal
   return
 }
 
-const GQLExtType = ExtType("gql_thread")
 func (ext *GQLExt) Type() ExtType {
   return GQLExtType
 }
diff --git a/lockable.go b/lockable.go
index be80e04..34b48c7 100644
--- a/lockable.go
+++ b/lockable.go
@@ -27,7 +27,6 @@ func LoadListenerExt(ctx *Context, data []byte) (Extension, error) {
   return NewListenerExt(j), nil
 }
 
-const ListenerExtType = ExtType("LISTENER")
 func (listener *ListenerExt) Type() ExtType {
   return ListenerExtType
 }
@@ -58,7 +57,6 @@ func (ext *ListenerExt) Serialize() ([]byte, error) {
   return json.MarshalIndent(ext.Buffer, "", "  ")
 }
 
-const LockableExtType = ExtType("LOCKABLE")
 func (ext *LockableExt) Type() ExtType {
   return LockableExtType
 }
diff --git a/node.go b/node.go
index 9b82474..3a7d741 100644
--- a/node.go
+++ b/node.go
@@ -129,9 +129,9 @@ func SoonestSignal(signals []QueuedSignal) (*QueuedSignal, <-chan time.Time) {
   }
 }
 
-func RunNode(ctx *Context, node *Node) {
+func runNode(ctx *Context, node *Node) {
   ctx.Log.Logf("node", "RUN_START: %s", node.ID)
-  err := NodeLoop(ctx, node)
+  err := nodeLoop(ctx, node)
   if err != nil {
     panic(err)
   }
@@ -144,7 +144,7 @@ type Msg struct {
 }
 
 // Main Loop for Threads, starts a write context, so cannot be called from a write or read context
-func NodeLoop(ctx *Context, node *Node) error {
+func nodeLoop(ctx *Context, node *Node) error {
   started := node.Active.CompareAndSwap(false, true)
   if started == false {
     return fmt.Errorf("%s is already started, will not start again", node.ID)
@@ -302,7 +302,7 @@ func NewNode(ctx *Context, id NodeID, node_type NodeType, queued_signals []Queue
   ctx.Nodes[id] = node
   WriteNode(ctx, node)
 
-  go RunNode(ctx, node)
+  go runNode(ctx, node)
 
   return node
 }
@@ -557,7 +557,7 @@ func LoadNode(ctx * Context, id NodeID) (*Node, error) {
 
   ctx.Log.Logf("db", "DB_NODE_LOADED: %s", id)
 
-  go RunNode(ctx, node)
+  go runNode(ctx, node)
 
   return node, nil
 }
@@ -603,24 +603,6 @@ func ACLList(list []*Node, resources []string) ACLMap {
   return reqs
 }
 
-type NodeType string
-func (node NodeType) Hash() uint64 {
-  hash := sha512.Sum512([]byte(fmt.Sprintf("NODE: %s", string(node))))
-  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
-}
-
-type PolicyType string
-func (policy PolicyType) Hash() uint64 {
-  hash := sha512.Sum512([]byte(fmt.Sprintf("POLICY: %s", string(policy))))
-  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
-}
-
-type ExtType string
-func (ext ExtType) Hash() uint64 {
-  hash := sha512.Sum512([]byte(fmt.Sprintf("EXTENSION: %s", string(ext))))
-  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
-}
-
 type NodeMap map[NodeID]*Node
 
 type ACLInfo struct {
diff --git a/policy.go b/policy.go
index b3017f5..b2c5b80 100644
--- a/policy.go
+++ b/policy.go
@@ -5,6 +5,18 @@ import (
   "fmt"
 )
 
+type PolicyType string
+func (policy PolicyType) Hash() uint64 {
+  hash := sha512.Sum512([]byte(fmt.Sprintf("POLICY: %s", string(policy))))
+  return binary.BigEndian.Uint64(hash[(len(hash)-9):(len(hash)-1)])
+}
+
+const (
+  RequirementOfPolicyType = PolicyType("REQUIREMENT_OF")
+  PerNodePolicyType = PolicyType("PER_NODE")
+  AllNodesPolicyType = PolicyType("ALL_NODES")
+)
+
 type Policy interface {
   Serializable[PolicyType]
   Allows(principal_id NodeID, action SignalType, node *Node) error
@@ -44,7 +56,6 @@ func (policy *RequirementOfPolicy) Allows(principal_id NodeID, action SignalType
   return fmt.Errorf("%s is not a requirement of %s", principal_id, node.ID)
 }
 
-const RequirementOfPolicyType = PolicyType("REQUIREMENT_OF")
 type RequirementOfPolicy struct {
   AllNodesPolicy
 }
@@ -113,7 +124,6 @@ type PerNodePolicy struct {
   NodeActions NodeActions `json:"node_actions"`
 }
 
-const PerNodePolicyType = PolicyType("PER_NODE")
 func (policy *PerNodePolicy) Type() PolicyType {
   return PerNodePolicyType
 }
@@ -136,7 +146,6 @@ type AllNodesPolicy struct {
   Actions Actions
 }
 
-const AllNodesPolicyType = PolicyType("ALL_NODES")
 func (policy *AllNodesPolicy) Type() PolicyType {
   return AllNodesPolicyType
 }
@@ -261,7 +270,6 @@ func LoadACLExt(ctx *Context, data []byte) (Extension, error) {
   return NewACLExt(policies...), nil
 }
 
-const ACLExtType = ExtType("ACL")
 func (ext *ACLExt) Type() ExtType {
   return ACLExtType
 }
diff --git a/user.go b/user.go
index 2b66b1a..0543264 100644
--- a/user.go
+++ b/user.go
@@ -24,7 +24,6 @@ func (ext *ECDHExt) Process(ctx *Context, princ_id NodeID, node *Node, signal Si
   return
 }
 
-const ECDHExtType = ExtType("ECDH")
 func (ext *ECDHExt) Type() ExtType {
   return ECDHExtType
 }
@@ -75,7 +74,6 @@ type GroupExt struct {
   Members NodeMap
 }
 
-const GroupExtType = ExtType("GROUP")
 func (ext *GroupExt) Type() ExtType {
   return GroupExtType
 }