| # Copyright 2015, Google Inc. |
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| |
| """The Python implementation of the gRPC route guide server.""" |
| |
| from concurrent import futures |
| import time |
| import math |
| |
| import grpc |
| |
| import route_guide_pb2 |
| import route_guide_pb2_grpc |
| import route_guide_resources |
| |
| _ONE_DAY_IN_SECONDS = 60 * 60 * 24 |
| |
| |
| def get_feature(feature_db, point): |
| """Returns Feature at given location or None.""" |
| for feature in feature_db: |
| if feature.location == point: |
| return feature |
| return None |
| |
| |
| def get_distance(start, end): |
| """Distance between two points.""" |
| coord_factor = 10000000.0 |
| lat_1 = start.latitude / coord_factor |
| lat_2 = end.latitude / coord_factor |
| lon_1 = start.longitude / coord_factor |
| lon_2 = end.longitude / coord_factor |
| lat_rad_1 = math.radians(lat_1) |
| lat_rad_2 = math.radians(lat_2) |
| delta_lat_rad = math.radians(lat_2 - lat_1) |
| delta_lon_rad = math.radians(lon_2 - lon_1) |
| |
| a = (pow(math.sin(delta_lat_rad / 2), 2) + |
| (math.cos(lat_rad_1) * math.cos(lat_rad_2) * |
| pow(math.sin(delta_lon_rad / 2), 2))) |
| c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a)) |
| R = 6371000; # metres |
| return R * c; |
| |
| class RouteGuideServicer(route_guide_pb2_grpc.RouteGuideServicer): |
| """Provides methods that implement functionality of route guide server.""" |
| |
| def __init__(self): |
| self.db = route_guide_resources.read_route_guide_database() |
| |
| def GetFeature(self, request, context): |
| feature = get_feature(self.db, request) |
| if feature is None: |
| return route_guide_pb2.Feature(name="", location=request) |
| else: |
| return feature |
| |
| def ListFeatures(self, request, context): |
| left = min(request.lo.longitude, request.hi.longitude) |
| right = max(request.lo.longitude, request.hi.longitude) |
| top = max(request.lo.latitude, request.hi.latitude) |
| bottom = min(request.lo.latitude, request.hi.latitude) |
| for feature in self.db: |
| if (feature.location.longitude >= left and |
| feature.location.longitude <= right and |
| feature.location.latitude >= bottom and |
| feature.location.latitude <= top): |
| yield feature |
| |
| def RecordRoute(self, request_iterator, context): |
| point_count = 0 |
| feature_count = 0 |
| distance = 0.0 |
| prev_point = None |
| |
| start_time = time.time() |
| for point in request_iterator: |
| point_count += 1 |
| if get_feature(self.db, point): |
| feature_count += 1 |
| if prev_point: |
| distance += get_distance(prev_point, point) |
| prev_point = point |
| |
| elapsed_time = time.time() - start_time |
| return route_guide_pb2.RouteSummary(point_count=point_count, |
| feature_count=feature_count, |
| distance=int(distance), |
| elapsed_time=int(elapsed_time)) |
| |
| def RouteChat(self, request_iterator, context): |
| prev_notes = [] |
| for new_note in request_iterator: |
| for prev_note in prev_notes: |
| if prev_note.location == new_note.location: |
| yield prev_note |
| prev_notes.append(new_note) |
| |
| |
| def serve(): |
| server = grpc.server(futures.ThreadPoolExecutor(max_workers=10)) |
| route_guide_pb2_grpc.add_RouteGuideServicer_to_server( |
| RouteGuideServicer(), server) |
| server.add_insecure_port('[::]:50051') |
| server.start() |
| try: |
| while True: |
| time.sleep(_ONE_DAY_IN_SECONDS) |
| except KeyboardInterrupt: |
| server.stop(0) |
| |
| if __name__ == '__main__': |
| serve() |