Add internals for async context and NewTarget

PR-URL: nodejs/node-addon-api#154
Reviewed-By: Jason Ginchereau <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: Marlyfleitas

src/node_api.cc

@@ -10,6 +10,7 @@
 
 #include <node_buffer.h>
 #include <node_object_wrap.h>
+#include <limits.h>  // INT_MAX
 #include <string.h>
 #include <algorithm>
 #include <cmath>
@@ -125,6 +126,9 @@ struct napi_env__ {
   do {                                                                   \
     static_assert(static_cast<int>(NAPI_AUTO_LENGTH) == -1,              \
                   "Casting NAPI_AUTO_LENGTH to int must result in -1");  \
+    RETURN_STATUS_IF_FALSE((env),                                        \
+        (len == NAPI_AUTO_LENGTH) || len <= INT_MAX,                     \
+        napi_invalid_arg);                                               \
     auto str_maybe = v8::String::NewFromUtf8(                            \
         (env)->isolate, (str), v8::NewStringType::kInternalized,         \
         static_cast<int>(len));                                          \
@@ -451,7 +455,7 @@ class CallbackWrapper {
   CallbackWrapper(napi_value this_arg, size_t args_length, void* data)
       : _this(this_arg), _args_length(args_length), _data(data) {}
 
-  virtual napi_value NewTarget() = 0;
+  virtual napi_value GetNewTarget() = 0;
   virtual void Args(napi_value* buffer, size_t bufferlength) = 0;
   virtual void SetReturnValue(napi_value value) = 0;
 
@@ -480,7 +484,7 @@ class CallbackWrapperBase : public CallbackWrapper {
                 ->Value();
   }
 
-  napi_value NewTarget() override { return nullptr; }
+  napi_value GetNewTarget() override { return nullptr; }
 
  protected:
   void InvokeCallback() {
@@ -528,7 +532,7 @@ class FunctionCallbackWrapper
       const v8::FunctionCallbackInfo<v8::Value>& cbinfo)
       : CallbackWrapperBase(cbinfo, cbinfo.Length()) {}
 
-  napi_value NewTarget() override {
+  napi_value GetNewTarget() override {
     if (_cbinfo.IsConstructCall()) {
       return v8impl::JsValueFromV8LocalValue(_cbinfo.NewTarget());
     } else {
@@ -850,8 +854,12 @@ void napi_module_register_cb(v8::Local<v8::Object> exports,
 
 // Registers a NAPI module.
 void napi_module_register(napi_module* mod) {
+  int module_version = -1;
+#ifdef EXTERNAL_NAPI
+  module_version = NODE_MODULE_VERSION;
+#endif  // EXTERNAL_NAPI
   node::node_module* nm = new node::node_module {
-    -1,
+    module_version,
     mod->nm_flags,
     nullptr,
     mod->nm_filename,
@@ -866,7 +874,7 @@ void napi_module_register(napi_module* mod) {
 
 // Warning: Keep in-sync with napi_status enum
 const char* error_messages[] = {nullptr,
-                                "Invalid pointer passed as argument",
+                                "Invalid argument",
                                 "An object was expected",
                                 "A string was expected",
                                 "A string or symbol was expected",
@@ -1904,7 +1912,7 @@ napi_status napi_get_new_target(napi_env env,
   v8impl::CallbackWrapper* info =
       reinterpret_cast<v8impl::CallbackWrapper*>(cbinfo);
 
-  *result = info->NewTarget();
+  *result = info->GetNewTarget();
   return napi_clear_last_error(env);
 }
 
@@ -3331,7 +3339,7 @@ class Work : public node::AsyncResource {
                 void* data = nullptr)
     : AsyncResource(env->isolate,
                     async_resource,
-                    async_resource_name),
+                    *v8::String::Utf8Value(async_resource_name)),
     _env(env),
     _data(data),
     _execute(execute),

src/node_internals.cc

@@ -10,8 +10,42 @@
 #include <unistd.h>  // getpid
 #endif
 
+#if NODE_MAJOR_VERSION < 8
+CallbackScope::CallbackScope(void *work) {
+}
+#endif // NODE_MAJOR_VERSION < 8
+
 namespace node {
 
+#if NODE_MAJOR_VERSION < 8
+
+async_context EmitAsyncInit(v8::Isolate* isolate,
+                            v8::Local<v8::Object> resource,
+                            v8::Local<v8::String> name,
+                            async_id trigger_async_id) {
+  return async_context();
+}
+
+void EmitAsyncDestroy(v8::Isolate* isolate,
+                      async_context asyncContext) {
+}
+
+v8::MaybeLocal<v8::Value> MakeCallback(v8::Isolate* isolate,
+                                       v8::Local<v8::Object> recv,
+                                       v8::Local<v8::Function> callback,
+                                       int argc,
+                                       v8::Local<v8::Value>* argv,
+                                       async_context asyncContext) {
+  return node::MakeCallback(isolate, recv, callback, argc, argv);
+}
+
+AsyncResource::AsyncResource(v8::Isolate* isolate,
+                             v8::Local<v8::Object> object,
+                             const char *name) {
+}
+
+#endif // NODE_MAJOR_VERSION < 8
+
 static void PrintErrorString(const char* format, ...) {
   va_list ap;
   va_start(ap, format);

src/node_internals.h

@@ -11,6 +11,7 @@
 #include <stdint.h>
 #include "uv.h"
 #include "node.h"
+#include <string>
 
 // Windows 8+ does not like abort() in Release mode
 #ifdef _WIN32
@@ -60,8 +61,49 @@
 #define NODE_RELEASE "node"
 #endif
 
+#if NODE_MAJOR_VERSION < 8 || NODE_MAJOR_VERSION == 8 && NODE_MINOR_VERSION < 6
+class CallbackScope {
+  public:
+    CallbackScope(void *work);
+};
+#endif // NODE_MAJOR_VERSION < 8
+
 namespace node {
 
+#if NODE_MAJOR_VERSION < 8 || NODE_MAJOR_VERSION == 8 && NODE_MINOR_VERSION < 6
+typedef int async_id;
+
+typedef struct async_context {
+  node::async_id async_id;
+  node::async_id trigger_async_id;
+} async_context;
+
+NODE_EXTERN async_context EmitAsyncInit(v8::Isolate* isolate,
+                                        v8::Local<v8::Object> resource,
+                                        v8::Local<v8::String> name,
+                                        async_id trigger_async_id = -1);
+
+NODE_EXTERN void EmitAsyncDestroy(v8::Isolate* isolate,
+                                  async_context asyncContext);
+
+v8::MaybeLocal<v8::Value> MakeCallback(v8::Isolate* isolate,
+                                       v8::Local<v8::Object> recv,
+                                       v8::Local<v8::Function> callback,
+                                       int argc,
+                                       v8::Local<v8::Value>* argv,
+                                       async_context asyncContext);
+
+#if NODE_MAJOR_VERSION < 8
+class AsyncResource {
+  public:
+    AsyncResource(v8::Isolate* isolate,
+                  v8::Local<v8::Object> object,
+                  const char *name);
+};
+#endif // node version below 8
+
+#endif // node version below 8.6
+
 // The slightly odd function signature for Assert() is to ease
 // instruction cache pressure in calls from ASSERT and CHECK.
 NO_RETURN void Abort();
@@ -75,6 +117,10 @@ NO_RETURN void FatalError(const char* location, const char* message);
 
 }  // namespace node
 
+#if NODE_MAJOR_VERSION < 8
+#define NewTarget This
+#endif // NODE_MAJOR_VERSION < 8
+
 #if NODE_MAJOR_VERSION < 6
 namespace v8 {
   namespace Private {