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# Copyright 2020 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.
"""The Python AsyncIO implementation of the gRPC route guide client."""
import asyncio
import logging
import random
from typing import Iterable, List
import grpc
import route_guide_pb2
import route_guide_pb2_grpc
import route_guide_resources
def make_route_note(message: str, latitude: int,
longitude: int) -> route_guide_pb2.RouteNote:
return route_guide_pb2.RouteNote(
message=message,
location=route_guide_pb2.Point(latitude=latitude, longitude=longitude))
# Performs an unary call
async def guide_get_one_feature(stub: route_guide_pb2_grpc.RouteGuideStub,
point: route_guide_pb2.Point) -> None:
feature = await stub.GetFeature(point)
if not feature.location:
print("Server returned incomplete feature")
return
if feature.name:
print(f"Feature called {feature.name} at {feature.location}")
else:
print(f"Found no feature at {feature.location}")
async def guide_get_feature(stub: route_guide_pb2_grpc.RouteGuideStub) -> None:
await guide_get_one_feature(
stub, route_guide_pb2.Point(latitude=409146138, longitude=-746188906))
await guide_get_one_feature(stub,
route_guide_pb2.Point(latitude=0, longitude=0))
# Performs a server-streaming call
async def guide_list_features(
stub: route_guide_pb2_grpc.RouteGuideStub) -> None:
rectangle = route_guide_pb2.Rectangle(
lo=route_guide_pb2.Point(latitude=400000000, longitude=-750000000),
hi=route_guide_pb2.Point(latitude=420000000, longitude=-730000000))
print("Looking for features between 40, -75 and 42, -73")
features = stub.ListFeatures(rectangle)
async for feature in features:
print(f"Feature called {feature.name} at {feature.location}")
def generate_route(
feature_list: List[route_guide_pb2.Feature]
) -> Iterable[route_guide_pb2.Point]:
for _ in range(0, 10):
random_feature = random.choice(feature_list)
print(f"Visiting point {random_feature.location}")
yield random_feature.location
# Performs a client-streaming call
async def guide_record_route(stub: route_guide_pb2_grpc.RouteGuideStub) -> None:
feature_list = route_guide_resources.read_route_guide_database()
route_iterator = generate_route(feature_list)
# gRPC AsyncIO client-streaming RPC API accepts both synchronous iterables
# and async iterables.
route_summary = await stub.RecordRoute(route_iterator)
print(f"Finished trip with {route_summary.point_count} points")
print(f"Passed {route_summary.feature_count} features")
print(f"Travelled {route_summary.distance} meters")
print(f"It took {route_summary.elapsed_time} seconds")
def generate_messages() -> Iterable[route_guide_pb2.RouteNote]:
messages = [
make_route_note("First message", 0, 0),
make_route_note("Second message", 0, 1),
make_route_note("Third message", 1, 0),
make_route_note("Fourth message", 0, 0),
make_route_note("Fifth message", 1, 0),
]
for msg in messages:
print(f"Sending {msg.message} at {msg.location}")
yield msg
# Performs a bidi-streaming call
async def guide_route_chat(stub: route_guide_pb2_grpc.RouteGuideStub) -> None:
# gRPC AsyncIO bidi-streaming RPC API accepts both synchronous iterables
# and async iterables.
call = stub.RouteChat(generate_messages())
async for response in call:
print(f"Received message {response.message} at {response.location}")
async def main() -> None:
async with grpc.aio.insecure_channel('localhost:50051') as channel:
stub = route_guide_pb2_grpc.RouteGuideStub(channel)
print("-------------- GetFeature --------------")
await guide_get_feature(stub)
print("-------------- ListFeatures --------------")
await guide_list_features(stub)
print("-------------- RecordRoute --------------")
await guide_record_route(stub)
print("-------------- RouteChat --------------")
await guide_route_chat(stub)
if __name__ == '__main__':
logging.basicConfig(level=logging.INFO)
asyncio.get_event_loop().run_until_complete(main())
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