Added stock service client and server

src/node/examples/stock.proto

+syntax = "proto3";
+
+package examples;
+
+// Protocol type definitions
+message StockRequest {
+  optional string symbol = 1;
+  optional int32 num_trades_to_watch = 2 [default=0];
+};
+
+message StockReply {
+  optional float price = 1;
+  optional string symbol = 2;
+};
+
+
+// Interface exported by the server
+service Stock {
+  // Simple blocking RPC
+  rpc GetLastTradePrice(StockRequest) returns (StockReply) {
+  };
+  // Bidirectional streaming RPC
+  rpc GetLastTradePriceMultiple(stream StockRequest) returns
+    (stream StockReply) {
+  };
+  // Unidirectional server-to-client streaming RPC
+  rpc WatchFutureTrades(StockRequest) returns (stream StockReply) {
+  };
+  // Unidirectional client-to-server streaming RPC
+  rpc GetHighestTradePrice(stream StockRequest) returns (StockReply) {
+  };
+
+};
\ No newline at end of file

src/node/examples/stock_client.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.
+ *
+ */
+
+var grpc = require('..');
+var examples = grpc.load(__dirname + '/stock.proto').examples;
+
+/**
+ * This exports a client constructor for the Stock service. The usage looks like
+ *
+ * var StockClient = require('stock_client.js');
+ * var stockClient = new StockClient(server_address);
+ */
+module.exports = examples.Stock;

src/node/examples/stock_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.
+ *
+ */
+
+var _ = require('underscore');
+var grpc = require('..');
+var examples = grpc.load(__dirname + '/stock.proto').examples;
+
+var StockServer = grpc.makeServerConstructor([examples.Stock.service]);
+
+function getLastTradePrice(call, callback) {
+  callback(null, {price: 88});
+}
+
+function watchFutureTrades(call) {
+  for (var i = 0; i < call.request.num_trades_to_watch; i++) {
+    call.write({price: 88.00 + i * 10.00});
+  }
+  call.end();
+}
+
+function getHighestTradePrice(call, callback) {
+  var trades = [];
+  call.on('data', function(data) {
+    trades.push({symbol: data.symbol, price: _.random(0, 100)});
+  });
+  call.on('end', function() {
+    if(_.isEmpty(trades)) {
+      callback(null, {});
+    } else {
+      callback(null, _.max(trades, function(trade){return trade.price;}));
+    }
+  });
+}
+
+function getLastTradePriceMultiple(call) {
+  call.on('data', function(data) {
+    call.write({price: 88});
+  });
+  call.on('end', function() {
+    call.end();
+  });
+}
+
+var stockServer = new StockServer({
+  'examples.Stock' : {
+    getLastTradePrice: getLastTradePrice,
+    getLastTradePriceMultiple: getLastTradePriceMultiple,
+    watchFutureTrades: watchFutureTrades,
+    getHighestTradePrice: getHighestTradePrice
+  }
+});
+
+exports.module = stockServer;