Initial checkin of gRPC to third_party/

third_party/grpc/examples/ruby/route_guide/route_guide_server.rb

Index: third_party/grpc/examples/ruby/route_guide/route_guide_server.rb
diff --git a/third_party/grpc/examples/ruby/route_guide/route_guide_server.rb b/third_party/grpc/examples/ruby/route_guide/route_guide_server.rb
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+#!/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'
+
+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