The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
 
 
 
 
 
 

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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.
"""An example of cancelling requests in gRPC."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import argparse
import logging
import signal
import sys
import grpc
from examples.python.cancellation import hash_name_pb2
from examples.python.cancellation import hash_name_pb2_grpc
_DESCRIPTION = "A client for finding hashes similar to names."
_LOGGER = logging.getLogger(__name__)
def run_unary_client(server_target, name, ideal_distance):
with grpc.insecure_channel(server_target) as channel:
stub = hash_name_pb2_grpc.HashFinderStub(channel)
future = stub.Find.future(
hash_name_pb2.HashNameRequest(
desired_name=name, ideal_hamming_distance=ideal_distance
),
wait_for_ready=True,
)
def cancel_request(unused_signum, unused_frame):
future.cancel()
sys.exit(0)
signal.signal(signal.SIGINT, cancel_request)
result = future.result()
print(result)
def run_streaming_client(
server_target, name, ideal_distance, interesting_distance
):
with grpc.insecure_channel(server_target) as channel:
stub = hash_name_pb2_grpc.HashFinderStub(channel)
result_generator = stub.FindRange(
hash_name_pb2.HashNameRequest(
desired_name=name,
ideal_hamming_distance=ideal_distance,
interesting_hamming_distance=interesting_distance,
),
wait_for_ready=True,
)
def cancel_request(unused_signum, unused_frame):
result_generator.cancel()
sys.exit(0)
signal.signal(signal.SIGINT, cancel_request)
for result in result_generator:
print(result)
def main():
parser = argparse.ArgumentParser(description=_DESCRIPTION)
parser.add_argument("name", type=str, help="The desired name.")
parser.add_argument(
"--ideal-distance",
default=0,
nargs="?",
type=int,
help="The desired Hamming distance.",
)
parser.add_argument(
"--server",
default="localhost:50051",
type=str,
nargs="?",
help="The host-port pair at which to reach the server.",
)
parser.add_argument(
"--show-inferior",
default=None,
type=int,
nargs="?",
help=(
"Also show candidates with a Hamming distance less than this value."
),
)
args = parser.parse_args()
if args.show_inferior is not None:
run_streaming_client(
args.server, args.name, args.ideal_distance, args.show_inferior
)
else:
run_unary_client(args.server, args.name, args.ideal_distance)
if __name__ == "__main__":
logging.basicConfig()
main()