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+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""The Python implementation of the gRPC route guide server."""
+
+import time
+import math
+
+import route_guide_pb2
+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.latitude / 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.EarlyAdopterRouteGuideServicer):
+ """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 = route_guide_pb2.early_adopter_create_RouteGuide_server(
+ RouteGuideServicer(), 50051, None, None)
+ server.start()
+ try:
+ while True:
+ time.sleep(_ONE_DAY_IN_SECONDS)
+ except KeyboardInterrupt:
+ server.stop()
+
+if __name__ == '__main__':
+ serve()