Initial checkin of gRPC to third_party/

third_party/grpc/src/node/test/math/math_server.js

+/*
+ *
+ * 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;