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# Copyright 2019 The 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.
"""This example sends out rich error status from server-side."""
from concurrent import futures
import logging
import threading
from google.protobuf import any_pb2
from google.rpc import code_pb2
from google.rpc import error_details_pb2
from google.rpc import status_pb2
import grpc
from grpc_status import rpc_status
from examples.protos import helloworld_pb2
from examples.protos import helloworld_pb2_grpc
def create_greet_limit_exceed_error_status(name):
detail = any_pb2.Any()
detail.Pack(
error_details_pb2.QuotaFailure(violations=[
error_details_pb2.QuotaFailure.Violation(
subject="name: %s" % name,
description="Limit one greeting per person",
)
],))
return status_pb2.Status(
code=code_pb2.RESOURCE_EXHAUSTED,
message='Request limit exceeded.',
details=[detail],
)
class LimitedGreeter(helloworld_pb2_grpc.GreeterServicer):
def __init__(self):
self._lock = threading.RLock()
self._greeted = set()
def SayHello(self, request, context):
with self._lock:
if request.name in self._greeted:
rich_status = create_greet_limit_exceed_error_status(
request.name)
context.abort_with_status(rpc_status.to_status(rich_status))
else:
self._greeted.add(request.name)
return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
def create_server(server_address):
server = grpc.server(futures.ThreadPoolExecutor())
helloworld_pb2_grpc.add_GreeterServicer_to_server(LimitedGreeter(), server)
port = server.add_insecure_port(server_address)
return server, port
def serve(server):
server.start()
server.wait_for_termination()
def main():
server, unused_port = create_server('[::]:50051')
serve(server)
if __name__ == '__main__':
logging.basicConfig()
main()
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