| /* |
| * |
| * 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. |
| * |
| */ |
| |
| 'use strict'; |
| |
| var grpc = require('../..'); |
| var math = grpc.load(__dirname + '/../../../proto/math/math.proto').math; |
| |
| |
| /** |
| * Server function for division. Provides the /Math/DivMany and /Math/Div |
| * functions (Div is just DivMany with only one stream element). For each |
| * DivArgs parameter, responds with a DivReply with the results of the division |
| * @param {Object} call The object containing request and cancellation info |
| * @param {function(Error, *)} cb Response callback |
| */ |
| function mathDiv(call, cb) { |
| var req = call.request; |
| // Unary + is explicit coersion to integer |
| if (+req.divisor === 0) { |
| cb(new Error('cannot divide by zero')); |
| } else { |
| cb(null, { |
| quotient: req.dividend / req.divisor, |
| remainder: req.dividend % req.divisor |
| }); |
| } |
| } |
| |
| /** |
| * Server function for Fibonacci numbers. Provides the /Math/Fib function. Reads |
| * a single parameter that indicates the number of responses, and then responds |
| * with a stream of that many Fibonacci numbers. |
| * @param {stream} stream The stream for sending responses. |
| */ |
| function mathFib(stream) { |
| // Here, call is a standard writable Node object Stream |
| var previous = 0, current = 1; |
| for (var i = 0; i < stream.request.limit; i++) { |
| stream.write({num: current}); |
| var temp = current; |
| current += previous; |
| previous = temp; |
| } |
| stream.end(); |
| } |
| |
| /** |
| * Server function for summation. Provides the /Math/Sum function. Reads a |
| * stream of number parameters, then responds with their sum. |
| * @param {stream} call The stream of arguments. |
| * @param {function(Error, *)} cb Response callback |
| */ |
| function mathSum(call, cb) { |
| // Here, call is a standard readable Node object Stream |
| var sum = 0; |
| call.on('data', function(data) { |
| sum += (+data.num); |
| }); |
| call.on('end', function() { |
| cb(null, {num: sum}); |
| }); |
| } |
| |
| function mathDivMany(stream) { |
| stream.on('data', function(div_args) { |
| if (+div_args.divisor === 0) { |
| stream.emit('error', new Error('cannot divide by zero')); |
| } else { |
| stream.write({ |
| quotient: div_args.dividend / div_args.divisor, |
| remainder: div_args.dividend % div_args.divisor |
| }); |
| } |
| }); |
| stream.on('end', function() { |
| stream.end(); |
| }); |
| } |
| |
| function getMathServer() { |
| var server = new grpc.Server(); |
| server.addProtoService(math.Math.service, { |
| div: mathDiv, |
| fib: mathFib, |
| sum: mathSum, |
| divMany: mathDivMany |
| }); |
| return server; |
| } |
| |
| if (require.main === module) { |
| var server = getMathServer(); |
| server.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure()); |
| server.start(); |
| } |
| |
| /** |
| * See docs for server |
| */ |
| module.exports = getMathServer; |