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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
# 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.
# Sample app that connects to a Route Guide service.
#
# Usage: $ path/to/route_guide_server.rb path/to/route_guide_db.json &
this_dir = File.expand_path(File.dirname(__FILE__))
lib_dir = File.join(File.dirname(this_dir), 'lib')
$LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir)
require 'grpc'
require 'multi_json'
require 'route_guide_services_pb'
include Routeguide
COORD_FACTOR = 1e7
RADIUS = 637_100
# Determines the distance between two points.
def calculate_distance(point_a, point_b)
to_radians = proc { |x| x * Math::PI / 180 }
lat_a = point_a.latitude / COORD_FACTOR
lat_b = point_b.latitude / COORD_FACTOR
long_a = point_a.longitude / COORD_FACTOR
long_b = point_b.longitude / COORD_FACTOR
φ1 = to_radians.call(lat_a)
φ2 = to_radians.call(lat_b)
Δφ = to_radians.call(lat_a - lat_b)
Δλ = to_radians.call(long_a - long_b)
a = Math.sin(Δφ / 2)**2 +
Math.cos(φ1) * Math.cos(φ2) +
Math.sin(Δλ / 2)**2
(2 * RADIUS * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a))).to_i
end
# RectangleEnum provides an Enumerator of the points in a feature_db within a
# given Rectangle.
class RectangleEnum
# @param [Hash] feature_db
# @param [Rectangle] bounds
def initialize(feature_db, bounds)
@feature_db = feature_db
@bounds = bounds
lats = [@bounds.lo.latitude, @bounds.hi.latitude]
longs = [@bounds.lo.longitude, @bounds.hi.longitude]
@lo_lat, @hi_lat = lats.min, lats.max
@lo_long, @hi_long = longs.min, longs.max
end
# in? determines if location lies within the bounds of this instances
# Rectangle.
def in?(location)
location['longitude'] >= @lo_long &&
location['longitude'] <= @hi_long &&
location['latitude'] >= @lo_lat &&
location['latitude'] <= @hi_lat
end
# each yields the features in the instances feature_db that lie within the
# instance rectangle.
def each
return enum_for(:each) unless block_given?
@feature_db.each_pair do |location, name|
next unless in?(location)
next if name.nil? || name == ''
pt = Point.new(
Hash[location.each_pair.map { |k, v| [k.to_sym, v] }])
yield Feature.new(location: pt, name: name)
end
end
end
# A EnumeratorQueue wraps a Queue to yield the items added to it.
class EnumeratorQueue
extend Forwardable
def_delegators :@q, :push
def initialize(sentinel)
@q = Queue.new
@sentinel = sentinel
@received_notes = {}
end
def each_item
return enum_for(:each_item) unless block_given?
loop do
r = @q.pop
break if r.equal?(@sentinel)
fail r if r.is_a? Exception
yield r
end
end
end
# ServerImpl provides an implementation of the RouteGuide service.
class ServerImpl < RouteGuide::Service
# @param [Hash] feature_db {location => name}
def initialize(feature_db)
@feature_db = feature_db
@received_notes = Hash.new { |h, k| h[k] = [] }
end
def get_feature(point, _call)
name = @feature_db[{
'longitude' => point.longitude,
'latitude' => point.latitude }] || ''
Feature.new(location: point, name: name)
end
def list_features(rectangle, _call)
RectangleEnum.new(@feature_db, rectangle).each
end
def record_route(call)
started, elapsed_time = 0, 0
distance, count, features, last = 0, 0, 0, nil
call.each_remote_read do |point|
count += 1
name = @feature_db[{
'longitude' => point.longitude,
'latitude' => point.latitude }] || ''
features += 1 unless name == ''
if last.nil?
last = point
started = Time.now.to_i
next
end
elapsed_time = Time.now.to_i - started
distance += calculate_distance(point, last)
last = point
end
RouteSummary.new(point_count: count,
feature_count: features,
distance: distance,
elapsed_time: elapsed_time)
end
def route_chat(notes)
q = EnumeratorQueue.new(self)
# run a separate thread that processes the incoming requests
t = Thread.new do
begin
notes.each do |n|
key = {
'latitude' => n.location.latitude,
'longitude' => n.location.longitude
}
earlier_msgs = @received_notes[key]
@received_notes[key] << n.message
# send back the earlier messages at this point
earlier_msgs.each do |r|
q.push(RouteNote.new(location: n.location, message: r))
end
end
q.push(self) # signal completion
rescue StandardError => e
q.push(e) # signal completion via an error
end
end
q.each_item
end
end
def main
if ARGV.length == 0
fail 'Please specify the path to the route_guide json database'
end
raw_data = []
File.open(ARGV[0]) do |f|
raw_data = MultiJson.load(f.read)
end
feature_db = Hash[raw_data.map { |x| [x['location'], x['name']] }]
port = '0.0.0.0:50051'
s = GRPC::RpcServer.new
s.add_http2_port(port, :this_port_is_insecure)
GRPC.logger.info("... running insecurely on #{port}")
s.handle(ServerImpl.new(feature_db))
s.run_till_terminated
end
main
|
