|
|
|
# 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."""
|
|
|
|
|
|
|
|
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()
|