1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
# Copyright 2015 gRPC authors.
#
# 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.
"""Tests of grpc._channel.Channel connectivity."""
import threading
import time
import unittest
import grpc
from tests.unit.framework.common import test_constants
from tests.unit import _thread_pool
def _ready_in_connectivities(connectivities):
return grpc.ChannelConnectivity.READY in connectivities
def _last_connectivity_is_not_ready(connectivities):
return connectivities[-1] is not grpc.ChannelConnectivity.READY
class _Callback(object):
def __init__(self):
self._condition = threading.Condition()
self._connectivities = []
def update(self, connectivity):
with self._condition:
self._connectivities.append(connectivity)
self._condition.notify()
def connectivities(self):
with self._condition:
return tuple(self._connectivities)
def block_until_connectivities_satisfy(self, predicate):
with self._condition:
while True:
connectivities = tuple(self._connectivities)
if predicate(connectivities):
return connectivities
else:
self._condition.wait()
class ChannelConnectivityTest(unittest.TestCase):
def test_lonely_channel_connectivity(self):
callback = _Callback()
channel = grpc.insecure_channel('localhost:12345')
channel.subscribe(callback.update, try_to_connect=False)
first_connectivities = callback.block_until_connectivities_satisfy(bool)
channel.subscribe(callback.update, try_to_connect=True)
second_connectivities = callback.block_until_connectivities_satisfy(
lambda connectivities: 2 <= len(connectivities))
# Wait for a connection that will never happen.
time.sleep(test_constants.SHORT_TIMEOUT)
third_connectivities = callback.connectivities()
channel.unsubscribe(callback.update)
fourth_connectivities = callback.connectivities()
channel.unsubscribe(callback.update)
fifth_connectivities = callback.connectivities()
self.assertSequenceEqual((grpc.ChannelConnectivity.IDLE,),
first_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.READY, second_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.READY, third_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.READY, fourth_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.READY, fifth_connectivities)
def test_immediately_connectable_channel_connectivity(self):
thread_pool = _thread_pool.RecordingThreadPool(max_workers=None)
server = grpc.server(thread_pool, options=(('grpc.so_reuseport', 0),))
port = server.add_insecure_port('[::]:0')
server.start()
first_callback = _Callback()
second_callback = _Callback()
channel = grpc.insecure_channel('localhost:{}'.format(port))
channel.subscribe(first_callback.update, try_to_connect=False)
first_connectivities = first_callback.block_until_connectivities_satisfy(
bool)
# Wait for a connection that will never happen because try_to_connect=True
# has not yet been passed.
time.sleep(test_constants.SHORT_TIMEOUT)
second_connectivities = first_callback.connectivities()
channel.subscribe(second_callback.update, try_to_connect=True)
third_connectivities = first_callback.block_until_connectivities_satisfy(
lambda connectivities: 2 <= len(connectivities))
fourth_connectivities = second_callback.block_until_connectivities_satisfy(
bool)
# Wait for a connection that will happen (or may already have happened).
first_callback.block_until_connectivities_satisfy(
_ready_in_connectivities)
second_callback.block_until_connectivities_satisfy(
_ready_in_connectivities)
del channel
self.assertSequenceEqual((grpc.ChannelConnectivity.IDLE,),
first_connectivities)
self.assertSequenceEqual((grpc.ChannelConnectivity.IDLE,),
second_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.TRANSIENT_FAILURE,
third_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.SHUTDOWN,
third_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.TRANSIENT_FAILURE,
fourth_connectivities)
self.assertNotIn(grpc.ChannelConnectivity.SHUTDOWN,
fourth_connectivities)
self.assertFalse(thread_pool.was_used())
def test_reachable_then_unreachable_channel_connectivity(self):
thread_pool = _thread_pool.RecordingThreadPool(max_workers=None)
server = grpc.server(thread_pool, options=(('grpc.so_reuseport', 0),))
port = server.add_insecure_port('[::]:0')
server.start()
callback = _Callback()
channel = grpc.insecure_channel('localhost:{}'.format(port))
channel.subscribe(callback.update, try_to_connect=True)
callback.block_until_connectivities_satisfy(_ready_in_connectivities)
# Now take down the server and confirm that channel readiness is repudiated.
server.stop(None)
callback.block_until_connectivities_satisfy(
_last_connectivity_is_not_ready)
channel.unsubscribe(callback.update)
self.assertFalse(thread_pool.was_used())
if __name__ == '__main__':
unittest.main(verbosity=2)
|
