mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
147 lines
4.8 KiB
147 lines
4.8 KiB
# Copyright 2020 The gRPC Authors |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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"""The Python AsyncIO implementation of the gRPC route guide server.""" |
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import asyncio |
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import logging |
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import math |
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import time |
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from typing import AsyncIterable, Iterable |
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import grpc |
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import route_guide_pb2 |
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import route_guide_pb2_grpc |
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import route_guide_resources |
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def get_feature( |
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feature_db: Iterable[route_guide_pb2.Feature], point: route_guide_pb2.Point |
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) -> route_guide_pb2.Feature: |
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"""Returns Feature at given location or None.""" |
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for feature in feature_db: |
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if feature.location == point: |
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return feature |
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return None |
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def get_distance( |
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start: route_guide_pb2.Point, end: route_guide_pb2.Point |
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) -> float: |
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"""Distance between two points.""" |
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coord_factor = 10000000.0 |
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lat_1 = start.latitude / coord_factor |
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lat_2 = end.latitude / coord_factor |
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lon_1 = start.longitude / coord_factor |
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lon_2 = end.longitude / coord_factor |
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lat_rad_1 = math.radians(lat_1) |
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lat_rad_2 = math.radians(lat_2) |
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delta_lat_rad = math.radians(lat_2 - lat_1) |
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delta_lon_rad = math.radians(lon_2 - lon_1) |
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# Formula is based on http://mathforum.org/library/drmath/view/51879.html |
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a = pow(math.sin(delta_lat_rad / 2), 2) + ( |
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math.cos(lat_rad_1) |
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* math.cos(lat_rad_2) |
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* pow(math.sin(delta_lon_rad / 2), 2) |
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) |
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c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a)) |
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R = 6371000 |
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# metres |
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return R * c |
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class RouteGuideServicer(route_guide_pb2_grpc.RouteGuideServicer): |
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"""Provides methods that implement functionality of route guide server.""" |
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def __init__(self) -> None: |
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self.db = route_guide_resources.read_route_guide_database() |
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def GetFeature( |
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self, request: route_guide_pb2.Point, unused_context |
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) -> route_guide_pb2.Feature: |
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feature = get_feature(self.db, request) |
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if feature is None: |
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return route_guide_pb2.Feature(name="", location=request) |
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else: |
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return feature |
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async def ListFeatures( |
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self, request: route_guide_pb2.Rectangle, unused_context |
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) -> AsyncIterable[route_guide_pb2.Feature]: |
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left = min(request.lo.longitude, request.hi.longitude) |
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right = max(request.lo.longitude, request.hi.longitude) |
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top = max(request.lo.latitude, request.hi.latitude) |
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bottom = min(request.lo.latitude, request.hi.latitude) |
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for feature in self.db: |
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if ( |
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feature.location.longitude >= left |
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and feature.location.longitude <= right |
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and feature.location.latitude >= bottom |
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and feature.location.latitude <= top |
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): |
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yield feature |
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async def RecordRoute( |
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self, |
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request_iterator: AsyncIterable[route_guide_pb2.Point], |
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unused_context, |
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) -> route_guide_pb2.RouteSummary: |
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point_count = 0 |
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feature_count = 0 |
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distance = 0.0 |
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prev_point = None |
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start_time = time.time() |
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async for point in request_iterator: |
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point_count += 1 |
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if get_feature(self.db, point): |
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feature_count += 1 |
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if prev_point: |
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distance += get_distance(prev_point, point) |
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prev_point = point |
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elapsed_time = time.time() - start_time |
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return route_guide_pb2.RouteSummary( |
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point_count=point_count, |
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feature_count=feature_count, |
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distance=int(distance), |
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elapsed_time=int(elapsed_time), |
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) |
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async def RouteChat( |
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self, |
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request_iterator: AsyncIterable[route_guide_pb2.RouteNote], |
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unused_context, |
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) -> AsyncIterable[route_guide_pb2.RouteNote]: |
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prev_notes = [] |
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async for new_note in request_iterator: |
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for prev_note in prev_notes: |
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if prev_note.location == new_note.location: |
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yield prev_note |
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prev_notes.append(new_note) |
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async def serve() -> None: |
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server = grpc.aio.server() |
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route_guide_pb2_grpc.add_RouteGuideServicer_to_server( |
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RouteGuideServicer(), server |
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) |
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server.add_insecure_port("[::]:50051") |
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await server.start() |
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await server.wait_for_termination() |
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if __name__ == "__main__": |
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logging.basicConfig(level=logging.INFO) |
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asyncio.get_event_loop().run_until_complete(serve())
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