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- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- /*
- * This file serves as a helper for bridging folly::future and python
- * asyncio.future.
- */
- #pragma once
- #include <Python.h>
- #include <folly/Executor.h>
- #include <folly/futures/Future.h>
- #include <folly/python/AsyncioExecutor.h>
- #include <folly/python/executor_api.h>
- namespace folly {
- namespace python {
- inline folly::Executor* getExecutor() {
- import_folly__executor();
- return get_executor();
- }
- template <typename T>
- void bridgeFuture(
- folly::Executor* executor,
- folly::Future<T>&& futureFrom,
- folly::Function<void(folly::Try<T>&&, PyObject*)> callback,
- PyObject* userData) {
- // We are handing over a pointer to a python object to c++ and need
- // to make sure it isn't removed by python in that time.
- Py_INCREF(userData);
- auto guard = folly::makeGuard([=] { Py_DECREF(userData); });
- // Handle the lambdas for cython
- // run callback from our Q
- futureFrom.via(executor).then(
- [callback = std::move(callback), userData, guard = std::move(guard)](
- folly::Try<T>&& res) mutable {
- // This will run from inside the gil, called by the asyncio add_reader
- callback(std::move(res), userData);
- // guard goes out of scope here, and its stored function is called
- });
- }
- template <typename T>
- void bridgeFuture(
- folly::Future<T>&& futureFrom,
- folly::Function<void(folly::Try<T>&&, PyObject*)> callback,
- PyObject* userData) {
- bridgeFuture(
- getExecutor(), std::move(futureFrom), std::move(callback), userData);
- }
- } // namespace python
- } // namespace folly
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