Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/grpc/aio/_base_server.py: 95%
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1# Copyright 2020 The gRPC Authors
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7# http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14"""Abstract base classes for server-side classes."""
16import abc
17from typing import Generic, Iterable, Mapping, Optional, Sequence
19import grpc
21from ._metadata import Metadata
22from ._typing import DoneCallbackType
23from ._typing import MetadataType
24from ._typing import RequestType
25from ._typing import ResponseType
28class Server(abc.ABC):
29 """Serves RPCs."""
31 @abc.abstractmethod
32 def add_generic_rpc_handlers(
33 self,
34 generic_rpc_handlers: Sequence[grpc.GenericRpcHandler]) -> None:
35 """Registers GenericRpcHandlers with this Server.
37 This method is only safe to call before the server is started.
39 Args:
40 generic_rpc_handlers: A sequence of GenericRpcHandlers that will be
41 used to service RPCs.
42 """
44 @abc.abstractmethod
45 def add_insecure_port(self, address: str) -> int:
46 """Opens an insecure port for accepting RPCs.
48 A port is a communication endpoint that used by networking protocols,
49 like TCP and UDP. To date, we only support TCP.
51 This method may only be called before starting the server.
53 Args:
54 address: The address for which to open a port. If the port is 0,
55 or not specified in the address, then the gRPC runtime will choose a port.
57 Returns:
58 An integer port on which the server will accept RPC requests.
59 """
61 @abc.abstractmethod
62 def add_secure_port(self, address: str,
63 server_credentials: grpc.ServerCredentials) -> int:
64 """Opens a secure port for accepting RPCs.
66 A port is a communication endpoint that used by networking protocols,
67 like TCP and UDP. To date, we only support TCP.
69 This method may only be called before starting the server.
71 Args:
72 address: The address for which to open a port.
73 if the port is 0, or not specified in the address, then the gRPC
74 runtime will choose a port.
75 server_credentials: A ServerCredentials object.
77 Returns:
78 An integer port on which the server will accept RPC requests.
79 """
81 @abc.abstractmethod
82 async def start(self) -> None:
83 """Starts this Server.
85 This method may only be called once. (i.e. it is not idempotent).
86 """
88 @abc.abstractmethod
89 async def stop(self, grace: Optional[float]) -> None:
90 """Stops this Server.
92 This method immediately stops the server from servicing new RPCs in
93 all cases.
95 If a grace period is specified, this method returns immediately and all
96 RPCs active at the end of the grace period are aborted. If a grace
97 period is not specified (by passing None for grace), all existing RPCs
98 are aborted immediately and this method blocks until the last RPC
99 handler terminates.
101 This method is idempotent and may be called at any time. Passing a
102 smaller grace value in a subsequent call will have the effect of
103 stopping the Server sooner (passing None will have the effect of
104 stopping the server immediately). Passing a larger grace value in a
105 subsequent call will not have the effect of stopping the server later
106 (i.e. the most restrictive grace value is used).
108 Args:
109 grace: A duration of time in seconds or None.
110 """
112 @abc.abstractmethod
113 async def wait_for_termination(self,
114 timeout: Optional[float] = None) -> bool:
115 """Continues current coroutine once the server stops.
117 This is an EXPERIMENTAL API.
119 The wait will not consume computational resources during blocking, and
120 it will block until one of the two following conditions are met:
122 1) The server is stopped or terminated;
123 2) A timeout occurs if timeout is not `None`.
125 The timeout argument works in the same way as `threading.Event.wait()`.
126 https://docs.python.org/3/library/threading.html#threading.Event.wait
128 Args:
129 timeout: A floating point number specifying a timeout for the
130 operation in seconds.
132 Returns:
133 A bool indicates if the operation times out.
134 """
137# pylint: disable=too-many-public-methods
138class ServicerContext(Generic[RequestType, ResponseType], abc.ABC):
139 """A context object passed to method implementations."""
141 @abc.abstractmethod
142 async def read(self) -> RequestType:
143 """Reads one message from the RPC.
145 Only one read operation is allowed simultaneously.
147 Returns:
148 A response message of the RPC.
150 Raises:
151 An RpcError exception if the read failed.
152 """
154 @abc.abstractmethod
155 async def write(self, message: ResponseType) -> None:
156 """Writes one message to the RPC.
158 Only one write operation is allowed simultaneously.
160 Raises:
161 An RpcError exception if the write failed.
162 """
164 @abc.abstractmethod
165 async def send_initial_metadata(self,
166 initial_metadata: MetadataType) -> None:
167 """Sends the initial metadata value to the client.
169 This method need not be called by implementations if they have no
170 metadata to add to what the gRPC runtime will transmit.
172 Args:
173 initial_metadata: The initial :term:`metadata`.
174 """
176 @abc.abstractmethod
177 async def abort(
178 self,
179 code: grpc.StatusCode,
180 details: str = '',
181 trailing_metadata: MetadataType = tuple()) -> None:
182 """Raises an exception to terminate the RPC with a non-OK status.
184 The code and details passed as arguments will supercede any existing
185 ones.
187 Args:
188 code: A StatusCode object to be sent to the client.
189 It must not be StatusCode.OK.
190 details: A UTF-8-encodable string to be sent to the client upon
191 termination of the RPC.
192 trailing_metadata: A sequence of tuple represents the trailing
193 :term:`metadata`.
195 Raises:
196 Exception: An exception is always raised to signal the abortion the
197 RPC to the gRPC runtime.
198 """
200 @abc.abstractmethod
201 def set_trailing_metadata(self, trailing_metadata: MetadataType) -> None:
202 """Sends the trailing metadata for the RPC.
204 This method need not be called by implementations if they have no
205 metadata to add to what the gRPC runtime will transmit.
207 Args:
208 trailing_metadata: The trailing :term:`metadata`.
209 """
211 @abc.abstractmethod
212 def invocation_metadata(self) -> Optional[Metadata]:
213 """Accesses the metadata sent by the client.
215 Returns:
216 The invocation :term:`metadata`.
217 """
219 @abc.abstractmethod
220 def set_code(self, code: grpc.StatusCode) -> None:
221 """Sets the value to be used as status code upon RPC completion.
223 This method need not be called by method implementations if they wish
224 the gRPC runtime to determine the status code of the RPC.
226 Args:
227 code: A StatusCode object to be sent to the client.
228 """
230 @abc.abstractmethod
231 def set_details(self, details: str) -> None:
232 """Sets the value to be used the as detail string upon RPC completion.
234 This method need not be called by method implementations if they have
235 no details to transmit.
237 Args:
238 details: A UTF-8-encodable string to be sent to the client upon
239 termination of the RPC.
240 """
242 @abc.abstractmethod
243 def set_compression(self, compression: grpc.Compression) -> None:
244 """Set the compression algorithm to be used for the entire call.
246 This is an EXPERIMENTAL method.
248 Args:
249 compression: An element of grpc.compression, e.g.
250 grpc.compression.Gzip.
251 """
253 @abc.abstractmethod
254 def disable_next_message_compression(self) -> None:
255 """Disables compression for the next response message.
257 This is an EXPERIMENTAL method.
259 This method will override any compression configuration set during
260 server creation or set on the call.
261 """
263 @abc.abstractmethod
264 def peer(self) -> str:
265 """Identifies the peer that invoked the RPC being serviced.
267 Returns:
268 A string identifying the peer that invoked the RPC being serviced.
269 The string format is determined by gRPC runtime.
270 """
272 @abc.abstractmethod
273 def peer_identities(self) -> Optional[Iterable[bytes]]:
274 """Gets one or more peer identity(s).
276 Equivalent to
277 servicer_context.auth_context().get(servicer_context.peer_identity_key())
279 Returns:
280 An iterable of the identities, or None if the call is not
281 authenticated. Each identity is returned as a raw bytes type.
282 """
284 @abc.abstractmethod
285 def peer_identity_key(self) -> Optional[str]:
286 """The auth property used to identify the peer.
288 For example, "x509_common_name" or "x509_subject_alternative_name" are
289 used to identify an SSL peer.
291 Returns:
292 The auth property (string) that indicates the
293 peer identity, or None if the call is not authenticated.
294 """
296 @abc.abstractmethod
297 def auth_context(self) -> Mapping[str, Iterable[bytes]]:
298 """Gets the auth context for the call.
300 Returns:
301 A map of strings to an iterable of bytes for each auth property.
302 """
304 def time_remaining(self) -> float:
305 """Describes the length of allowed time remaining for the RPC.
307 Returns:
308 A nonnegative float indicating the length of allowed time in seconds
309 remaining for the RPC to complete before it is considered to have
310 timed out, or None if no deadline was specified for the RPC.
311 """
313 def trailing_metadata(self):
314 """Access value to be used as trailing metadata upon RPC completion.
316 This is an EXPERIMENTAL API.
318 Returns:
319 The trailing :term:`metadata` for the RPC.
320 """
321 raise NotImplementedError()
323 def code(self):
324 """Accesses the value to be used as status code upon RPC completion.
326 This is an EXPERIMENTAL API.
328 Returns:
329 The StatusCode value for the RPC.
330 """
331 raise NotImplementedError()
333 def details(self):
334 """Accesses the value to be used as detail string upon RPC completion.
336 This is an EXPERIMENTAL API.
338 Returns:
339 The details string of the RPC.
340 """
341 raise NotImplementedError()
343 def add_done_callback(self, callback: DoneCallbackType) -> None:
344 """Registers a callback to be called on RPC termination.
346 This is an EXPERIMENTAL API.
348 Args:
349 callback: A callable object will be called with the servicer context
350 object as its only argument.
351 """
353 def cancelled(self) -> bool:
354 """Return True if the RPC is cancelled.
356 The RPC is cancelled when the cancellation was requested with cancel().
358 This is an EXPERIMENTAL API.
360 Returns:
361 A bool indicates whether the RPC is cancelled or not.
362 """
364 def done(self) -> bool:
365 """Return True if the RPC is done.
367 An RPC is done if the RPC is completed, cancelled or aborted.
369 This is an EXPERIMENTAL API.
371 Returns:
372 A bool indicates if the RPC is done.
373 """