Merge pull request #81 from bigcat26/fix_scope_leak

fix: memory leak

Author: hsluoyz

casbin/enforcer.cpp

@@ -200,7 +200,6 @@ Enforcer :: Enforcer(shared_ptr<Model> m, shared_ptr<Adapter> adapter) {
 
     this->model = m;
     this->model->PrintModel();
-    this->func_map.LoadFunctionMap();
 
     this->Initialize();
 
@@ -468,7 +467,9 @@ bool Enforcer::EnforceWithMatcher(string matcher, vector<string> params) {
         PushStringPropToObject(scope, "r", params[i], r_tokens[i].substr(2, r_tokens[i].size() - 2));
     }
 
-    return this->enforce(matcher, scope);
+    bool result = this->enforce(matcher, scope);
+    DeinitializeScope(scope);
+    return result;
 }
 
 // EnforceWithMatcher use a custom matcher to decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (matcher, sub, obj, act), use model matcher by default when matcher is "".
@@ -480,5 +481,7 @@ bool Enforcer::EnforceWithMatcher(string matcher, unordered_map<string, string>
         PushStringPropToObject(scope, "r", r.second, r.first);
     }
 
-    return this->enforce(matcher, scope);
+    bool result = this->enforce(matcher, scope);
+    DeinitializeScope(scope);
+    return result;
 }

casbin/model/function.cpp

@@ -22,7 +22,7 @@
 #include "../util/util.h"
 
 FunctionMap :: FunctionMap(){
-    scope = InitializeScope();
+    scope = NULL;
 }
 
 void FunctionMap :: ProcessFunctions(string expression){

casbin/model/scope_config.cpp

@@ -24,6 +24,10 @@ Scope InitializeScope() {
     return duk_create_heap_default();
 }
 
+void DeinitializeScope(Scope scope) {
+    duk_destroy_heap(scope);
+}
+
 void PushFunctionValue(Scope scope, Function f, int nargs){
     duk_push_c_function(scope, f, (Index)nargs);
 }

casbin/model/scope_config.h

@@ -40,6 +40,7 @@ typedef duk_c_function Function;
 typedef duk_idx_t Index;
 
 Scope InitializeScope();
+void DeinitializeScope(Scope scope);
 void PushFunctionValue(Scope scope, Function f, int nargs);
 void PushBooleanValue(Scope scope, bool expression);
 void PushTrueValue(Scope scope);