1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
# 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 json
import time
import math
import route_guide_pb2
_ONE_DAY_IN_SECONDS = 60 * 60 * 24
def read_route_guide_db():
"""Reads the route guide"""
feature_list = []
with open("route_guide_db.json") as route_guide_db_file:
for item in json.load(route_guide_db_file):
feature = route_guide_pb2.Feature(name=item["name"])
feature.location.longitude = item["location"]["longitude"]
feature.location.latitude = item["location"]["latitude"]
feature_list.append(feature)
return feature_list
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 = read_route_guide_db()
def GetFeature(self, request, context):
feature = get_feature(self.db, request)
if not feature:
feature = route_guide_pb2.Feature(name="")
feature.location.longitude = request.longitude
feature.location.latitude = request.latitude
return feature
def ListFeatures(self, request, context):
lo = request.lo
hi = request.hi
left = min(lo.longitude, hi.longitude)
right = max(lo.longitude, hi.longitude)
top = max(lo.latitude, hi.latitude)
bottom = min(lo.latitude, 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()
|
