| # Copyright 2015, Google Inc. |
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| |
| """Tests of grpc.channel_ready_future.""" |
| |
| import threading |
| import unittest |
| from concurrent import futures |
| |
| import grpc |
| from grpc import _channel |
| from grpc import _server |
| from tests.unit.framework.common import test_constants |
| |
| |
| class _Callback(object): |
| |
| def __init__(self): |
| self._condition = threading.Condition() |
| self._value = None |
| |
| def accept_value(self, value): |
| with self._condition: |
| self._value = value |
| self._condition.notify_all() |
| |
| def block_until_called(self): |
| with self._condition: |
| while self._value is None: |
| self._condition.wait() |
| return self._value |
| |
| |
| class ChannelReadyFutureTest(unittest.TestCase): |
| |
| def test_lonely_channel_connectivity(self): |
| channel = grpc.insecure_channel('localhost:12345') |
| callback = _Callback() |
| |
| ready_future = grpc.channel_ready_future(channel) |
| ready_future.add_done_callback(callback.accept_value) |
| with self.assertRaises(grpc.FutureTimeoutError): |
| ready_future.result(test_constants.SHORT_TIMEOUT) |
| self.assertFalse(ready_future.cancelled()) |
| self.assertFalse(ready_future.done()) |
| self.assertTrue(ready_future.running()) |
| ready_future.cancel() |
| value_passed_to_callback = callback.block_until_called() |
| self.assertIs(ready_future, value_passed_to_callback) |
| self.assertTrue(ready_future.cancelled()) |
| self.assertTrue(ready_future.done()) |
| self.assertFalse(ready_future.running()) |
| |
| def test_immediately_connectable_channel_connectivity(self): |
| server = _server.Server(futures.ThreadPoolExecutor(max_workers=0), ()) |
| port = server.add_insecure_port('[::]:0') |
| server.start() |
| channel = grpc.insecure_channel('localhost:{}'.format(port)) |
| callback = _Callback() |
| |
| ready_future = grpc.channel_ready_future(channel) |
| ready_future.add_done_callback(callback.accept_value) |
| self.assertIsNone(ready_future.result(test_constants.SHORT_TIMEOUT)) |
| value_passed_to_callback = callback.block_until_called() |
| self.assertIs(ready_future, value_passed_to_callback) |
| self.assertFalse(ready_future.cancelled()) |
| self.assertTrue(ready_future.done()) |
| self.assertFalse(ready_future.running()) |
| # Cancellation after maturity has no effect. |
| ready_future.cancel() |
| self.assertFalse(ready_future.cancelled()) |
| self.assertTrue(ready_future.done()) |
| self.assertFalse(ready_future.running()) |
| |
| |
| if __name__ == '__main__': |
| unittest.main(verbosity=2) |