Added code generation for clients and servers

src/node/common.js

@@ -31,32 +31,68 @@
  *
  */
 
-var _ = require('highland');
+/**
+ * Get a function that deserializes a specific type of protobuf.
+ * @param {function()} cls The constructor of the message type to deserialize
+ * @return {function(Buffer):cls} The deserialization function
+ */
+function deserializeCls(cls) {
+  /**
+   * Deserialize a buffer to a message object
+   * @param {Buffer} arg_buf The buffer to deserialize
+   * @return {cls} The resulting object
+   */
+  return function deserialize(arg_buf) {
+    return cls.decode(arg_buf);
+  };
+}
+
+/**
+ * Get a function that serializes objects to a buffer by protobuf class.
+ * @param {function()} Cls The constructor of the message type to serialize
+ * @return {function(Cls):Buffer} The serialization function
+ */
+function serializeCls(Cls) {
+  /**
+   * Serialize an object to a Buffer
+   * @param {Object} arg The object to serialize
+   * @return {Buffer} The serialized object
+   */
+  return function serialize(arg) {
+    return new Buffer(new Cls(arg).encode().toBuffer());
+  };
+}
 
 /**
- * When the given stream finishes without error, call the callback once. This
- * will not be called until something begins to consume the stream.
- * @param {function} callback The callback to call at stream end
- * @param {stream} source The stream to watch
- * @return {stream} The stream with the callback attached
+ * Get the fully qualified (dotted) name of a ProtoBuf.Reflect value.
+ * @param {ProtoBuf.Reflect.Namespace} value The value to get the name of
+ * @return {string} The fully qualified name of the value
  */
-function onSuccessfulStreamEnd(callback, source) {
-  var error = false;
-  return source.consume(function(err, x, push, next) {
-    if (x === _.nil) {
-      if (!error) {
-        callback();
-      }
-      push(null, x);
-    } else if (err) {
-      error = true;
-      push(err);
-      next();
-    } else {
-      push(err, x);
-      next();
+function fullyQualifiedName(value) {
+  if (value === null || value === undefined) {
+    return '';
+  }
+  var name = value.name;
+  if (value.hasOwnProperty('parent')) {
+    var parent_name = fullyQualifiedName(value.parent);
+    if (parent_name !== '') {
+      name = parent_name + '.' + name;
     }
-  });
+  }
+  return name;
 }
 
-exports.onSuccessfulStreamEnd = onSuccessfulStreamEnd;
+/**
+ * See docs for deserializeCls
+ */
+exports.deserializeCls = deserializeCls;
+
+/**
+ * See docs for serializeCls
+ */
+exports.serializeCls = serializeCls;
+
+/**
+ * See docs for fullyQualifiedName
+ */
+exports.fullyQualifiedName = fullyQualifiedName;

src/node/examples/math.proto

-syntax = "proto2";
+syntax = "proto3";
 
 package math;
 
 message DivArgs {
-  required int64 dividend = 1;
-  required int64 divisor = 2;
+  optional int64 dividend = 1;
+  optional int64 divisor = 2;
 }
 
 message DivReply {
-  required int64 quotient = 1;
-  required int64 remainder = 2;
+  optional int64 quotient = 1;
+  optional int64 remainder = 2;
 }
 
 message FibArgs {
@@ -17,9 +17,34 @@ message FibArgs {
 }
 
 message Num {
-  required int64 num = 1;
+  optional int64 num = 1;
 }
 
 message FibReply {
-  required int64 count = 1;
-}
\ No newline at end of file
+  optional int64 count = 1;
+}
+
+service Math {
+  // Div divides args.dividend by args.divisor and returns the quotient and
+  // remainder.
+  rpc Div (DivArgs) returns (DivReply) {
+  }
+
+  // DivMany accepts an arbitrary number of division args from the client stream
+  // and sends back the results in the reply stream.  The stream continues until
+  // the client closes its end; the server does the same after sending all the
+  // replies.  The stream ends immediately if either end aborts.
+  rpc DivMany (stream DivArgs) returns (stream DivReply) {
+  }
+
+  // Fib generates numbers in the Fibonacci sequence.  If args.limit > 0, Fib
+  // generates up to limit numbers; otherwise it continues until the call is
+  // canceled.  Unlike Fib above, Fib has no final FibReply.
+  rpc Fib (FibArgs) returns (stream Num) {
+  }
+
+  // Sum sums a stream of numbers, returning the final result once the stream
+  // is closed.
+  rpc Sum (stream Num) returns (Num) {
+  }
+}

src/node/examples/math_server.js

@@ -38,77 +38,10 @@ var util = require('util');
 
 var Transform = require('stream').Transform;
 
-var builder = ProtoBuf.loadProtoFile(__dirname + '/math.proto');
-var math = builder.build('math');
+var grpc = require('..');
+var math = grpc.load(__dirname + '/math.proto').math;
 
-var makeConstructor = require('../surface_server.js').makeServerConstructor;
-
-/**
- * Get a function that deserializes a specific type of protobuf.
- * @param {function()} cls The constructor of the message type to deserialize
- * @return {function(Buffer):cls} The deserialization function
- */
-function deserializeCls(cls) {
-  /**
-   * Deserialize a buffer to a message object
-   * @param {Buffer} arg_buf The buffer to deserialize
-   * @return {cls} The resulting object
-   */
-  return function deserialize(arg_buf) {
-    return cls.decode(arg_buf);
-  };
-}
-
-/**
- * Get a function that serializes objects to a buffer by protobuf class.
- * @param {function()} Cls The constructor of the message type to serialize
- * @return {function(Cls):Buffer} The serialization function
- */
-function serializeCls(Cls) {
-  /**
-   * Serialize an object to a Buffer
-   * @param {Object} arg The object to serialize
-   * @return {Buffer} The serialized object
-   */
-  return function serialize(arg) {
-    return new Buffer(new Cls(arg).encode().toBuffer());
-  };
-}
-
-/* This function call creates a server constructor for servers that that expose
- * the four specified methods. This specifies how to serialize messages that the
- * server sends and deserialize messages that the client sends, and whether the
- * client or the server will send a stream of messages, for each method. This
- * also specifies a prefix that will be added to method names when sending them
- * on the wire. This function call and all of the preceding code in this file
- * are intended to approximate what the generated code will look like for the
- * math service */
-var Server = makeConstructor({
-  Div: {
-    serialize: serializeCls(math.DivReply),
-    deserialize: deserializeCls(math.DivArgs),
-    client_stream: false,
-    server_stream: false
-  },
-  Fib: {
-    serialize: serializeCls(math.Num),
-    deserialize: deserializeCls(math.FibArgs),
-    client_stream: false,
-    server_stream: true
-  },
-  Sum: {
-    serialize: serializeCls(math.Num),
-    deserialize: deserializeCls(math.Num),
-    client_stream: true,
-    server_stream: false
-  },
-  DivMany: {
-    serialize: serializeCls(math.DivReply),
-    deserialize: deserializeCls(math.DivArgs),
-    client_stream: true,
-    server_stream: true
-  }
-}, '/Math/');
+var Server = grpc.buildServer([math.Math.service]);
 
 /**
  * Server function for division. Provides the /Math/DivMany and /Math/Div
@@ -185,10 +118,12 @@ function mathDivMany(stream) {
 }
 
 var server = new Server({
-  Div: mathDiv,
-  Fib: mathFib,
-  Sum: mathSum,
-  DivMany: mathDivMany
+  'math.Math' : {
+    Div: mathDiv,
+    Fib: mathFib,
+    Sum: mathSum,
+    DivMany: mathDivMany
+  }
 });
 
 if (require.main === module) {

src/node/main.js

+/*
+ *
+ * Copyright 2014, 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 ProtoBuf = require('protobufjs');
+
+var surface_client = require('./surface_client.js');
+
+var surface_server = require('./surface_server.js');
+
+var grpc = require('bindings')('grpc');
+
+/**
+ * Load a gRPC object from an existing ProtoBuf.Reflect object.
+ * @param {ProtoBuf.Reflect.Namespace} value The ProtoBuf object to load.
+ * @return {Object<string, *>} The resulting gRPC object
+ */
+function loadObject(value) {
+  var result = {};
+  if (value.className === 'Namespace') {
+    _.each(value.children, function(child) {
+      result[child.name] = loadObject(child);
+    });
+    return result;
+  } else if (value.className === 'Service') {
+    return surface_client.makeClientConstructor(value);
+  } else if (value.className === 'Service.Message') {
+    return value.build();
+  } else {
+    return value;
+  }
+}
+
+/**
+ * Load a gRPC object from a .proto file.
+ * @param {string} filename The file to load
+ * @return {Object<string, *>} The resulting gRPC object
+ */
+function load(filename) {
+  var builder = ProtoBuf.loadProtoFile(filename);
+
+  return loadObject(builder.ns);
+}
+
+/**
+ * See docs for loadObject
+ */
+exports.loadObject = loadObject;
+
+/**
+ * See docs for load
+ */
+exports.load = load;
+
+/**
+ * See docs for surface_server.makeServerConstructor
+ */
+exports.buildServer = surface_server.makeServerConstructor;
+
+/**
+ * Status name to code number mapping
+ */
+exports.status = grpc.status;
+/**
+ * Call error name to code number mapping
+ */
+exports.callError = grpc.callError;

src/node/package.json

@@ -8,11 +8,12 @@
   "dependencies": {
     "bindings": "^1.2.1",
     "nan": "~1.3.0",
-    "underscore": "^1.7.0"
+    "underscore": "^1.7.0",
+    "protobufjs": "murgatroid99/ProtoBuf.js"
   },
   "devDependencies": {
     "mocha": "~1.21.0",
-    "highland": "~2.0.0",
-    "protobufjs": "~3.8.0"
-  }
+    "highland": "~2.0.0"
+  },
+  "main": "main.js"
 }

src/node/server.js

@@ -31,6 +31,8 @@
  *
  */
 
+var _ = require('underscore');
+
 var grpc = require('bindings')('grpc.node');
 
 var common = require('./common');
@@ -176,6 +178,10 @@ function Server(options) {
    * @this Server
    */
   this.start = function() {
+    console.log('Server starting');
+    _.each(handlers, function(handler, handler_name) {
+      console.log('Serving', handler_name);
+    });
     if (this.started) {
       throw 'Server is already running';
     }

src/node/surface_client.js

@@ -35,6 +35,8 @@ var _ = require('underscore');
 
 var client = require('./client.js');
 
+var common = require('./common.js');
+
 var EventEmitter = require('events').EventEmitter;
 
 var stream = require('stream');
@@ -44,6 +46,7 @@ var Writable = stream.Writable;
 var Duplex = stream.Duplex;
 var util = require('util');
 
+
 function forwardEvent(fromEmitter, toEmitter, event) {
   fromEmitter.on(event, function forward() {
     _.partial(toEmitter.emit, event).apply(toEmitter, arguments);
@@ -317,16 +320,13 @@ var requester_makers = {
 }
 
 /**
- * Creates a constructor for clients with a service defined by the methods
- * object. The methods object has string keys and values of this form:
- * {serialize: function, deserialize: function, client_stream: bool,
- *  server_stream: bool}
- * @param {!Object<string, Object>} methods Method descriptor for each method
- *     the client should expose
- * @param {string} prefix The prefix to prepend to each method name
+ * Creates a constructor for clients for the given service
+ * @param {ProtoBuf.Reflect.Service} service The service to generate a client
+ *     for
  * @return {function(string, Object)} New client constructor
  */
-function makeClientConstructor(methods, prefix) {
+function makeClientConstructor(service) {
+  var prefix = '/' + common.fullyQualifiedName(service) + '/';
   /**
    * Create a client with the given methods
    * @constructor
@@ -337,27 +337,29 @@ function makeClientConstructor(methods, prefix) {
     this.channel = new client.Channel(address, options);
   }
 
-  _.each(methods, function(method, name) {
+  _.each(service.children, function(method) {
     var method_type;
-    if (method.client_stream) {
-      if (method.server_stream) {
+    if (method.requestStream) {
+      if (method.responseStream) {
         method_type = 'bidi';
       } else {
         method_type = 'client_stream';
       }
     } else {
-      if (method.server_stream) {
+      if (method.responseStream) {
         method_type = 'server_stream';
       } else {
         method_type = 'unary';
       }
     }
-    SurfaceClient.prototype[name] = requester_makers[method_type](
-        prefix + name,
-        method.serialize,
-        method.deserialize);
+    SurfaceClient.prototype[method.name] = requester_makers[method_type](
+        prefix + method.name,
+        common.serializeCls(method.resolvedRequestType.build()),
+        common.deserializeCls(method.resolvedResponseType.build()));
   });
 
+  SurfaceClient.service = service;
+
   return SurfaceClient;
 }
 

src/node/surface_server.js

@@ -42,6 +42,8 @@ var Writable = stream.Writable;
 var Duplex = stream.Duplex;
 var util = require('util');
 
+var common = require('./common.js');
+
 util.inherits(ServerReadableObjectStream, Readable);
 
 /**
@@ -287,36 +289,59 @@ var handler_makers = {
  * @param {string} prefix The prefex to prepend to each method name
  * @return {function(Object, Object)} New server constructor
  */
-function makeServerConstructor(methods, prefix) {
+function makeServerConstructor(services) {
+  var qual_names = [];
+  _.each(services, function(service) {
+    _.each(service.children, function(method) {
+      var name = common.fullyQualifiedName(method);
+      if (_.indexOf(qual_names, name) !== -1) {
+        throw new Error('Method ' + name + ' exposed by more than one service');
+      }
+      qual_names.push(name);
+    });
+  });
   /**
    * Create a server with the given handlers for all of the methods.
    * @constructor
-   * @param {Object} handlers Map from method names to method handlers.
+   * @param {Object} service_handlers Map from service names to map from method
+   *     names to handlers
    * @param {Object} options Options to pass to the underlying server
    */
-  function SurfaceServer(handlers, options) {
+  function SurfaceServer(service_handlers, options) {
     var server = new Server(options);
     this.inner_server = server;
-    _.each(handlers, function(handler, name) {
-      var method = methods[name];
-      var method_type;
-      if (method.client_stream) {
-        if (method.server_stream) {
-          method_type = 'bidi';
+    _.each(services, function(service) {
+      var service_name = common.fullyQualifiedName(service);
+      if (service_handlers[service_name] === undefined) {
+        throw new Error('Handlers for service ' +
+            service_name + ' not provided.');
+      }
+      var prefix = '/' + common.fullyQualifiedName(service) + '/';
+      _.each(service.children, function(method) {
+        var method_type;
+        if (method.requestStream) {
+          if (method.responseStream) {
+            method_type = 'bidi';
+          } else {
+            method_type = 'client_stream';
+          }
         } else {
-          method_type = 'client_stream';
+          if (method.responseStream) {
+            method_type = 'server_stream';
+          } else {
+            method_type = 'unary';
+          }
         }
-      } else {
-        if (method.server_stream) {
-          method_type = 'server_stream';
-        } else {
-          method_type = 'unary';
+        if (service_handlers[service_name][method.name] === undefined) {
+          throw new Error('Method handler for ' +
+              common.fullyQualifiedName(method) + ' not provided.');
         }
-      }
-      var binary_handler = handler_makers[method_type](handler,
-                                                       method.serialize,
-                                                       method.deserialize);
-      server.register('' + prefix + name, binary_handler);
+        var binary_handler = handler_makers[method_type](
+            service_handlers[service_name][method.name],
+            common.serializeCls(method.resolvedResponseType.build()),
+            common.deserializeCls(method.resolvedRequestType.build()));
+        server.register(prefix + method.name, binary_handler);
+      });
     }, this);
   }
 

src/node/test/math_client_test.js

@@ -32,83 +32,13 @@
  */
 
 var assert = require('assert');
-var ProtoBuf = require('protobufjs');
 var port_picker = require('../port_picker');
 
-var builder = ProtoBuf.loadProtoFile(__dirname + '/../examples/math.proto');
-var math = builder.build('math');
+var grpc = require('..');
+var math = grpc.load(__dirname + '/../examples/math.proto').math;
 
-var client = require('../surface_client.js');
-var makeConstructor = client.makeClientConstructor;
 /**
- * Get a function that deserializes a specific type of protobuf.
- * @param {function()} cls The constructor of the message type to deserialize
- * @return {function(Buffer):cls} The deserialization function
- */
-function deserializeCls(cls) {
-  /**
-   * Deserialize a buffer to a message object
-   * @param {Buffer} arg_buf The buffer to deserialize
-   * @return {cls} The resulting object
-   */
-  return function deserialize(arg_buf) {
-    return cls.decode(arg_buf);
-  };
-}
-
-/**
- * Get a function that serializes objects to a buffer by protobuf class.
- * @param {function()} Cls The constructor of the message type to serialize
- * @return {function(Cls):Buffer} The serialization function
- */
-function serializeCls(Cls) {
-  /**
-   * Serialize an object to a Buffer
-   * @param {Object} arg The object to serialize
-   * @return {Buffer} The serialized object
-   */
-  return function serialize(arg) {
-    return new Buffer(new Cls(arg).encode().toBuffer());
-  };
-}
-
-/* This function call creates a client constructor for clients that expose the
- * four specified methods. This specifies how to serialize messages that the
- * client sends and deserialize messages that the server sends, and whether the
- * client or the server will send a stream of messages, for each method. This
- * also specifies a prefix that will be added to method names when sending them
- * on the wire. This function call and all of the preceding code in this file
- * are intended to approximate what the generated code will look like for the
- * math client */
-var MathClient = makeConstructor({
-  Div: {
-    serialize: serializeCls(math.DivArgs),
-    deserialize: deserializeCls(math.DivReply),
-    client_stream: false,
-    server_stream: false
-  },
-  Fib: {
-    serialize: serializeCls(math.FibArgs),
-    deserialize: deserializeCls(math.Num),
-    client_stream: false,
-    server_stream: true
-  },
-  Sum: {
-    serialize: serializeCls(math.Num),
-    deserialize: deserializeCls(math.Num),
-    client_stream: true,
-    server_stream: false
-  },
-  DivMany: {
-    serialize: serializeCls(math.DivArgs),
-    deserialize: deserializeCls(math.DivReply),
-    client_stream: true,
-    server_stream: true
-  }
-}, '/Math/');
-
-/**
- * Channel to use to make requests to a running server.
+ * Client to use to make requests to a running server.
  */
 var math_client;
 
@@ -122,7 +52,7 @@ describe('Math client', function() {
   before(function(done) {
     port_picker.nextAvailablePort(function(port) {
       server.bind(port).listen();
-      math_client = new MathClient(port);
+      math_client = new math.Math(port);
       done();
     });
   });
@@ -137,7 +67,7 @@ describe('Math client', function() {
       assert.equal(value.remainder, 3);
     });
     call.on('status', function checkStatus(status) {
-      assert.strictEqual(status.code, client.status.OK);
+      assert.strictEqual(status.code, grpc.status.OK);
       done();
     });
   });
@@ -150,7 +80,7 @@ describe('Math client', function() {
       next_expected += 1;
     });
     call.on('status', function checkStatus(status) {
-      assert.strictEqual(status.code, client.status.OK);
+      assert.strictEqual(status.code, grpc.status.OK);
       done();
     });
   });
@@ -164,7 +94,7 @@ describe('Math client', function() {
     }
     call.end();
     call.on('status', function checkStatus(status) {
-      assert.strictEqual(status.code, client.status.OK);
+      assert.strictEqual(status.code, grpc.status.OK);
       done();
     });
   });
@@ -184,7 +114,7 @@ describe('Math client', function() {
     }
     call.end();
     call.on('status', function checkStatus(status) {
-      assert.strictEqual(status.code, client.status.OK);
+      assert.strictEqual(status.code, grpc.status.OK);
       done();
     });
   });

src/node/test/surface_test.js

+/*
+ *
+ * Copyright 2014, 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 assert = require('assert');
+
+var surface_server = require('../surface_server.js');
+
+var ProtoBuf = require('protobufjs');
+
+var grpc = require('..');
+
+var math_proto = ProtoBuf.loadProtoFile(__dirname + '/../examples/math.proto');
+
+var mathService = math_proto.lookup('math.Math');
+
+describe('Surface server constructor', function() {
+  it('Should fail with conflicting method names', function() {
+    assert.throws(function() {
+      grpc.buildServer([mathService, mathService]);
+    });
+  });
+  it('Should succeed with a single service', function() {
+    assert.doesNotThrow(function() {
+      grpc.buildServer([mathService]);
+    });
+  });
+  it('Should fail with missing handlers', function() {
+    var Server = grpc.buildServer([mathService]);
+    assert.throws(function() {
+      new Server({
+        'math.Math': {
+          'Div': function() {},
+          'DivMany': function() {},
+          'Fib': function() {}
+        }
+      });
+    }, /math.Math.Sum/);
+  });
+  it('Should fail with no handlers for the service', function() {
+    var Server = grpc.buildServer([mathService]);
+    assert.throws(function() {
+      new Server({});
+    }, /math.Math/);
+  });
+});