Initial checkin of gRPC to third_party/

third_party/grpc/examples/node/route_guide/route_guide_client.js

+/*
+ *
+ * Copyright 2015-2016, 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.
+ *
+ */
+
+var PROTO_PATH = __dirname + '/../../protos/route_guide.proto';
+
+var async = require('async');
+var fs = require('fs');
+var parseArgs = require('minimist');
+var path = require('path');
+var _ = require('lodash');
+var grpc = require('grpc');
+var routeguide = grpc.load(PROTO_PATH).routeguide;
+var client = new routeguide.RouteGuide('localhost:50051',
+                                       grpc.credentials.createInsecure());
+
+var COORD_FACTOR = 1e7;
+
+/**
+ * Run the getFeature demo. Calls getFeature with a point known to have a
+ * feature and a point known not to have a feature.
+ * @param {function} callback Called when this demo is complete
+ */
+function runGetFeature(callback) {
+  var next = _.after(2, callback);
+  function featureCallback(error, feature) {
+    if (error) {
+      callback(error);
+    }
+    if (feature.name === '') {
+      console.log('Found no feature at ' +
+          feature.location.latitude/COORD_FACTOR + ', ' +
+          feature.location.longitude/COORD_FACTOR);
+    } else {
+      console.log('Found feature called "' + feature.name + '" at ' +
+          feature.location.latitude/COORD_FACTOR + ', ' +
+          feature.location.longitude/COORD_FACTOR);
+    }
+    next();
+  }
+  var point1 = {
+    latitude: 409146138,
+    longitude: -746188906
+  };
+  var point2 = {
+    latitude: 0,
+    longitude: 0
+  };
+  client.getFeature(point1, featureCallback);
+  client.getFeature(point2, featureCallback);
+}
+
+/**
+ * Run the listFeatures demo. Calls listFeatures with a rectangle containing all
+ * of the features in the pre-generated database. Prints each response as it
+ * comes in.
+ * @param {function} callback Called when this demo is complete
+ */
+function runListFeatures(callback) {
+  var rectangle = {
+    lo: {
+      latitude: 400000000,
+      longitude: -750000000
+    },
+    hi: {
+      latitude: 420000000,
+      longitude: -730000000
+    }
+  };
+  console.log('Looking for features between 40, -75 and 42, -73');
+  var call = client.listFeatures(rectangle);
+  call.on('data', function(feature) {
+      console.log('Found feature called "' + feature.name + '" at ' +
+          feature.location.latitude/COORD_FACTOR + ', ' +
+          feature.location.longitude/COORD_FACTOR);
+  });
+  call.on('end', callback);
+}
+
+/**
+ * Run the recordRoute demo. Sends several randomly chosen points from the
+ * pre-generated feature database with a variable delay in between. Prints the
+ * statistics when they are sent from the server.
+ * @param {function} callback Called when this demo is complete
+ */
+function runRecordRoute(callback) {
+  var argv = parseArgs(process.argv, {
+    string: 'db_path'
+  });
+  fs.readFile(path.resolve(argv.db_path), function(err, data) {
+    if (err) callback(err);
+    var feature_list = JSON.parse(data);
+
+    var num_points = 10;
+    var call = client.recordRoute(function(error, stats) {
+      if (error) {
+        callback(error);
+      }
+      console.log('Finished trip with', stats.point_count, 'points');
+      console.log('Passed', stats.feature_count, 'features');
+      console.log('Travelled', stats.distance, 'meters');
+      console.log('It took', stats.elapsed_time, 'seconds');
+      callback();
+    });
+    /**
+     * Constructs a function that asynchronously sends the given point and then
+     * delays sending its callback
+     * @param {number} lat The latitude to send
+     * @param {number} lng The longitude to send
+     * @return {function(function)} The function that sends the point
+     */
+    function pointSender(lat, lng) {
+      /**
+       * Sends the point, then calls the callback after a delay
+       * @param {function} callback Called when complete
+       */
+      return function(callback) {
+        console.log('Visiting point ' + lat/COORD_FACTOR + ', ' +
+            lng/COORD_FACTOR);
+        call.write({
+          latitude: lat,
+          longitude: lng
+        });
+        _.delay(callback, _.random(500, 1500));
+      };
+    }
+    var point_senders = [];
+    for (var i = 0; i < num_points; i++) {
+      var rand_point = feature_list[_.random(0, feature_list.length - 1)];
+      point_senders[i] = pointSender(rand_point.location.latitude,
+                                     rand_point.location.longitude);
+    }
+    async.series(point_senders, function() {
+      call.end();
+    });
+  });
+}
+
+/**
+ * Run the routeChat demo. Send some chat messages, and print any chat messages
+ * that are sent from the server.
+ * @param {function} callback Called when the demo is complete
+ */
+function runRouteChat(callback) {
+  var call = client.routeChat();
+  call.on('data', function(note) {
+    console.log('Got message "' + note.message + '" at ' +
+        note.location.latitude + ', ' + note.location.longitude);
+  });
+
+  call.on('end', callback);
+
+  var notes = [{
+    location: {
+      latitude: 0,
+      longitude: 0
+    },
+    message: 'First message'
+  }, {
+    location: {
+      latitude: 0,
+      longitude: 1
+    },
+    message: 'Second message'
+  }, {
+    location: {
+      latitude: 1,
+      longitude: 0
+    },
+    message: 'Third message'
+  }, {
+    location: {
+      latitude: 0,
+      longitude: 0
+    },
+    message: 'Fourth message'
+  }];
+  for (var i = 0; i < notes.length; i++) {
+    var note = notes[i];
+    console.log('Sending message "' + note.message + '" at ' +
+        note.location.latitude + ', ' + note.location.longitude);
+    call.write(note);
+  }
+  call.end();
+}
+
+/**
+ * Run all of the demos in order
+ */
+function main() {
+  async.series([
+    runGetFeature,
+    runListFeatures,
+    runRecordRoute,
+    runRouteChat
+  ]);
+}
+
+if (require.main === module) {
+  main();
+}
+
+exports.runGetFeature = runGetFeature;
+
+exports.runListFeatures = runListFeatures;
+
+exports.runRecordRoute = runRecordRoute;
+
+exports.runRouteChat = runRouteChat;