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
|
# 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.
import collections
import logging
import threading
import grpc
from grpc import _common
from grpc._cython import cygrpc
_LOGGER = logging.getLogger(__name__)
class _AuthMetadataContext(
collections.namedtuple('AuthMetadataContext', (
'service_url',
'method_name',
)), grpc.AuthMetadataContext):
pass
class _CallbackState(object):
def __init__(self):
self.lock = threading.Lock()
self.called = False
self.exception = None
class _AuthMetadataPluginCallback(grpc.AuthMetadataPluginCallback):
def __init__(self, state, callback):
self._state = state
self._callback = callback
def __call__(self, metadata, error):
with self._state.lock:
if self._state.exception is None:
if self._state.called:
raise RuntimeError(
'AuthMetadataPluginCallback invoked more than once!')
else:
self._state.called = True
else:
raise RuntimeError(
'AuthMetadataPluginCallback raised exception "{}"!'.format(
self._state.exception))
if error is None:
self._callback(metadata, cygrpc.StatusCode.ok, None)
else:
self._callback(None, cygrpc.StatusCode.internal,
_common.encode(str(error)))
class _Plugin(object):
def __init__(self, metadata_plugin):
self._metadata_plugin = metadata_plugin
def __call__(self, service_url, method_name, callback):
context = _AuthMetadataContext(
_common.decode(service_url), _common.decode(method_name))
callback_state = _CallbackState()
try:
self._metadata_plugin(context,
_AuthMetadataPluginCallback(
callback_state, callback))
except Exception as exception: # pylint: disable=broad-except
_LOGGER.exception(
'AuthMetadataPluginCallback "%s" raised exception!',
self._metadata_plugin)
with callback_state.lock:
callback_state.exception = exception
if callback_state.called:
return
callback(None, cygrpc.StatusCode.internal,
_common.encode(str(exception)))
def metadata_plugin_call_credentials(metadata_plugin, name):
if name is None:
try:
effective_name = metadata_plugin.__name__
except AttributeError:
effective_name = metadata_plugin.__class__.__name__
else:
effective_name = name
return grpc.CallCredentials(
cygrpc.MetadataPluginCallCredentials(
_Plugin(metadata_plugin), _common.encode(effective_name)))
|
