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#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 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
# 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)
RouteChatEnumerator.new(notes, @received_notes).each_item
end
end
class RouteChatEnumerator
def initialize(notes, received_notes)
@notes = notes
@received_notes = received_notes
end
def each_item
return enum_for(:each_item) unless block_given?
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|
yield RouteNote.new(location: n.location, message: r)
end
end
rescue StandardError => e
fail e # signal completion via an error
end
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
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