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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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140 lines
4.8 KiB
140 lines
4.8 KiB
# Copyright 2015, Google Inc. |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are |
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# met: |
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# |
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# * Redistributions of source code must retain the above copyright |
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# notice, this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above |
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# copyright notice, this list of conditions and the following disclaimer |
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# in the documentation and/or other materials provided with the |
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# distribution. |
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# * Neither the name of Google Inc. nor the names of its |
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# contributors may be used to endorse or promote products derived from |
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# this software without specific prior written permission. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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"""The Python implementation of the gRPC route guide server.""" |
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from concurrent import futures |
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import time |
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import math |
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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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_ONE_DAY_IN_SECONDS = 60 * 60 * 24 |
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def get_feature(feature_db, point): |
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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(start, end): |
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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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a = (pow(math.sin(delta_lat_rad / 2), 2) + |
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(math.cos(lat_rad_1) * math.cos(lat_rad_2) * |
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pow(math.sin(delta_lon_rad / 2), 2))) |
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c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a)) |
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R = 6371000; # 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): |
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self.db = route_guide_resources.read_route_guide_database() |
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def GetFeature(self, request, context): |
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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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def ListFeatures(self, request, context): |
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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 (feature.location.longitude >= left and |
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feature.location.longitude <= right and |
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feature.location.latitude >= bottom and |
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feature.location.latitude <= top): |
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yield feature |
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def RecordRoute(self, request_iterator, context): |
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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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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(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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def RouteChat(self, request_iterator, context): |
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prev_notes = [] |
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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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def serve(): |
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server = grpc.server(futures.ThreadPoolExecutor(max_workers=10)) |
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route_guide_pb2_grpc.add_RouteGuideServicer_to_server( |
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RouteGuideServicer(), server) |
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server.add_insecure_port('[::]:50051') |
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server.start() |
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try: |
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while True: |
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time.sleep(_ONE_DAY_IN_SECONDS) |
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except KeyboardInterrupt: |
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server.stop(0) |
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if __name__ == '__main__': |
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serve()
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