node/src/async-wrap.cc

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "async-wrap.h"
#include "async-wrap-inl.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"

#include "v8.h"

using v8::Context;
using v8::Function;
using v8::Handle;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::TryCatch;
using v8::Value;

namespace node {

static void Initialize(Handle<Object> target,
                Handle<Value> unused,
                Handle<Context> context) {
  Environment* env = Environment::GetCurrent(context);
  Isolate* isolate = env->isolate();
  HandleScope scope(isolate);

  Local<Object> async_providers = Object::New(isolate);
#define V(PROVIDER)                                                           \
  async_providers->Set(FIXED_ONE_BYTE_STRING(isolate, #PROVIDER),             \
      Integer::New(isolate, AsyncWrap::PROVIDER_ ## PROVIDER));
  NODE_ASYNC_PROVIDER_TYPES(V)
#undef V
  target->Set(FIXED_ONE_BYTE_STRING(isolate, "Providers"), async_providers);
}


Handle<Value> AsyncWrap::MakeCallback(const Handle<Function> cb,
                                      int argc,
                                      Handle<Value>* argv) {
  CHECK(env()->context() == env()->isolate()->GetCurrentContext());

  Local<Object> context = object();
  Local<Object> process = env()->process_object();
  Local<Object> domain;
  bool has_domain = false;

  if (env()->using_domains()) {
    Local<Value> domain_v = context->Get(env()->domain_string());
    has_domain = domain_v->IsObject();
    if (has_domain) {
      domain = domain_v.As<Object>();
      if (domain->Get(env()->disposed_string())->IsTrue())
        return Undefined(env()->isolate());
    }
  }

  TryCatch try_catch;
  try_catch.SetVerbose(true);

  if (has_domain) {
    Local<Value> enter_v = domain->Get(env()->enter_string());
    if (enter_v->IsFunction()) {
      enter_v.As<Function>()->Call(domain, 0, nullptr);
      if (try_catch.HasCaught())
        return Undefined(env()->isolate());
    }
  }

  Local<Value> ret = cb->Call(context, argc, argv);

  if (try_catch.HasCaught()) {
    return Undefined(env()->isolate());
  }

  if (has_domain) {
    Local<Value> exit_v = domain->Get(env()->exit_string());
    if (exit_v->IsFunction()) {
      exit_v.As<Function>()->Call(domain, 0, nullptr);
      if (try_catch.HasCaught())
        return Undefined(env()->isolate());
    }
  }

  Environment::TickInfo* tick_info = env()->tick_info();

  if (tick_info->in_tick()) {
    return ret;
  }

  if (tick_info->length() == 0) {
    env()->isolate()->RunMicrotasks();
  }

  if (tick_info->length() == 0) {
    tick_info->set_index(0);
    return ret;
  }

  tick_info->set_in_tick(true);

  env()->tick_callback_function()->Call(process, 0, nullptr);

  tick_info->set_in_tick(false);

  if (try_catch.HasCaught()) {
    tick_info->set_last_threw(true);
    return Undefined(env()->isolate());
  }

  return ret;
}

}  // namespace node

NODE_MODULE_CONTEXT_AWARE_BUILTIN(async_wrap, node::Initialize)