Python3 Migrate

venv/lib/python3.7/site-packages/pykka/gevent.py

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+from __future__ import absolute_import
+
+import sys
+
+import gevent
+import gevent.event
+import gevent.queue
+
+from pykka import Actor, Future, Timeout
+
+
+__all__ = ['GeventActor', 'GeventFuture']
+
+
+class GeventFuture(Future):
+    """
+    :class:`GeventFuture` implements :class:`pykka.Future` for use with
+    :class:`GeventActor`.
+
+    It encapsulates a :class:`gevent.event.AsyncResult` object which may be
+    used directly, though it will couple your code with gevent.
+    """
+
+    #: The encapsulated :class:`gevent.event.AsyncResult`
+    async_result = None
+
+    def __init__(self, async_result=None):
+        super(GeventFuture, self).__init__()
+        if async_result is None:
+            async_result = gevent.event.AsyncResult()
+        self.async_result = async_result
+
+    def get(self, timeout=None):
+        try:
+            return super(GeventFuture, self).get(timeout=timeout)
+        except NotImplementedError:
+            pass
+
+        try:
+            return self.async_result.get(timeout=timeout)
+        except gevent.Timeout as e:
+            raise Timeout(e)
+
+    def set(self, value=None):
+        assert not self.async_result.ready(), 'value has already been set'
+        self.async_result.set(value)
+
+    def set_exception(self, exc_info=None):
+        assert exc_info is None or len(exc_info) == 3
+        exc_info = exc_info or sys.exc_info()
+        self.async_result.set_exception(exc_info[1], exc_info=exc_info)
+
+
+class GeventActor(Actor):
+    """
+    :class:`GeventActor` implements :class:`pykka.Actor` using the `gevent
+    <http://www.gevent.org/>`_ library. gevent is a coroutine-based Python
+    networking library that uses greenlet to provide a high-level synchronous
+    API on top of libevent event loop.
+
+    This is a very fast implementation.
+    """
+
+    @staticmethod
+    def _create_actor_inbox():
+        return gevent.queue.Queue()
+
+    @staticmethod
+    def _create_future():
+        return GeventFuture()
+
+    def _start_actor_loop(self):
+        gevent.Greenlet.spawn(self._actor_loop)