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# Copyright (c) 2016 Uber Technologies, 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.
import sys
from tornado import gen
from tornado.concurrent import Future
def submit(fn, io_loop, *args, **kwargs):
"""Submit Tornado Coroutine to IOLoop.current().
:param fn: Tornado Coroutine to execute
:param io_loop: Tornado IOLoop where to schedule the coroutine
:param args: Args to pass to coroutine
:param kwargs: Kwargs to pass to coroutine
:returns tornado.concurrent.Future: future result of coroutine
"""
future = Future()
def execute():
"""Execute fn on the IOLoop."""
try:
result = gen.maybe_future(fn(*args, **kwargs))
except Exception:
# The function we ran didn't return a future and instead raised
# an exception. Let's pretend that it returned this dummy
# future with our stack trace.
f = gen.Future()
f.set_exc_info(sys.exc_info())
on_done(f)
else:
result.add_done_callback(on_done)
def on_done(tornado_future):
"""
Set tornado.Future results to the concurrent.Future.
:param tornado_future:
"""
exception = tornado_future.exception()
if not exception:
future.set_result(tornado_future.result())
else:
future.set_exception(exception)
io_loop.add_callback(execute)
return future
def future_result(result):
future = Future()
future.set_result(result)
return future
def future_exception(exception):
future = Future()
future.set_exception(exception)
return future
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