Refactored server.js and added a test to increase coverage

src/server.js

@@ -100,28 +100,6 @@ function handleError(call, error) {
   call.startBatch(error_batch, function(){});
 }
 
-/**
- * Wait for the client to close, then emit a cancelled event if the client
- * cancelled.
- * @access private
- * @param {grpc.Call} call The call object to wait on
- * @param {EventEmitter} emitter The event emitter to emit the cancelled event
- *     on
- */
-function waitForCancel(call, emitter) {
-  var cancel_batch = {};
-  cancel_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
-  call.startBatch(cancel_batch, function(err, result) {
-    if (err) {
-      emitter.emit('error', err);
-    }
-    if (result.cancelled) {
-      emitter.cancelled = true;
-      emitter.emit('cancelled');
-    }
-  });
-}
-
 /**
  * Send a response to a unary or client streaming call.
  * @access private
@@ -258,6 +236,13 @@ function setUpReadable(stream, deserialize) {
   });
 }
 
+util.inherits(ServerUnaryCall, EventEmitter);
+
+function ServerUnaryCall(call) {
+  EventEmitter.call(this);
+  this.call = call;
+}
+
 util.inherits(ServerWritableStream, Writable);
 
 /**
@@ -311,33 +296,6 @@ function _write(chunk, encoding, callback) {
 
 ServerWritableStream.prototype._write = _write;
 
-/**
- * Send the initial metadata for a writable stream.
- * @param {Metadata} responseMetadata Metadata to send
- */
-function sendMetadata(responseMetadata) {
-  /* jshint validthis: true */
-  var self = this;
-  if (!this.call.metadataSent) {
-    this.call.metadataSent = true;
-    var batch = [];
-    batch[grpc.opType.SEND_INITIAL_METADATA] =
-        responseMetadata._getCoreRepresentation();
-    this.call.startBatch(batch, function(err) {
-      if (err) {
-        self.emit('error', err);
-        return;
-      }
-    });
-  }
-}
-
-/**
- * @inheritdoc
- * @alias module:src/server~ServerWritableStream#sendMetadata
- */
-ServerWritableStream.prototype.sendMetadata = sendMetadata;
-
 util.inherits(ServerReadableStream, Readable);
 
 /**
@@ -427,6 +385,31 @@ function ServerDuplexStream(call, serialize, deserialize) {
 
 ServerDuplexStream.prototype._read = _read;
 ServerDuplexStream.prototype._write = _write;
+
+/**
+ * Send the initial metadata for a writable stream.
+ * @param {Metadata} responseMetadata Metadata to send
+ */
+function sendMetadata(responseMetadata) {
+  /* jshint validthis: true */
+  var self = this;
+  if (!this.call.metadataSent) {
+    this.call.metadataSent = true;
+    var batch = {};
+    batch[grpc.opType.SEND_INITIAL_METADATA] =
+        responseMetadata._getCoreRepresentation();
+    this.call.startBatch(batch, function(err) {
+      if (err) {
+        self.emit('error', err);
+        return;
+      }
+    });
+  }
+}
+
+ServerUnaryCall.prototype.sendMetadata = sendMetadata;
+ServerWritableStream.prototype.sendMetadata = sendMetadata;
+ServerReadableStream.prototype.sendMetadata = sendMetadata;
 ServerDuplexStream.prototype.sendMetadata = sendMetadata;
 
 /**
@@ -438,10 +421,36 @@ function getPeer() {
   return this.call.getPeer();
 }
 
+ServerUnaryCall.prototype.getPeer = getPeer;
 ServerReadableStream.prototype.getPeer = getPeer;
 ServerWritableStream.prototype.getPeer = getPeer;
 ServerDuplexStream.prototype.getPeer = getPeer;
 
+/**
+ * Wait for the client to close, then emit a cancelled event if the client
+ * cancelled.
+ */
+function waitForCancel() {
+  /* jshint validthis: true */
+  var self = this;
+  var cancel_batch = {};
+  cancel_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
+  self.call.startBatch(cancel_batch, function(err, result) {
+    if (err) {
+      self.emit('error', err);
+    }
+    if (result.cancelled) {
+      self.cancelled = true;
+      self.emit('cancelled');
+    }
+  });
+}
+
+ServerUnaryCall.prototype.waitForCancel = waitForCancel;
+ServerReadableStream.prototype.waitForCancel = waitForCancel;
+ServerWritableStream.prototype.waitForCancel = waitForCancel;
+ServerDuplexStream.prototype.waitForCancel = waitForCancel;
+
 /**
  * Fully handle a unary call
  * @access private
@@ -450,25 +459,12 @@ ServerDuplexStream.prototype.getPeer = getPeer;
  * @param {Metadata} metadata Metadata from the client
  */
 function handleUnary(call, handler, metadata) {
-  var emitter = new EventEmitter();
-  emitter.sendMetadata = function(responseMetadata) {
-    if (!call.metadataSent) {
-      call.metadataSent = true;
-      var batch = {};
-      batch[grpc.opType.SEND_INITIAL_METADATA] =
-          responseMetadata._getCoreRepresentation();
-      call.startBatch(batch, function() {});
-    }
-  };
-  emitter.getPeer = function() {
-    return call.getPeer();
-  };
+  var emitter = new ServerUnaryCall(call);
   emitter.on('error', function(error) {
     handleError(call, error);
   });
   emitter.metadata = metadata;
-  waitForCancel(call, emitter);
-  emitter.call = call;
+  emitter.waitForCancel();
   var batch = {};
   batch[grpc.opType.RECV_MESSAGE] = true;
   call.startBatch(batch, function(err, result) {
@@ -508,7 +504,7 @@ function handleUnary(call, handler, metadata) {
  */
 function handleServerStreaming(call, handler, metadata) {
   var stream = new ServerWritableStream(call, handler.serialize);
-  waitForCancel(call, stream);
+  stream.waitForCancel();
   stream.metadata = metadata;
   var batch = {};
   batch[grpc.opType.RECV_MESSAGE] = true;
@@ -537,19 +533,10 @@ function handleServerStreaming(call, handler, metadata) {
  */
 function handleClientStreaming(call, handler, metadata) {
   var stream = new ServerReadableStream(call, handler.deserialize);
-  stream.sendMetadata = function(responseMetadata) {
-    if (!call.metadataSent) {
-      call.metadataSent = true;
-      var batch = {};
-      batch[grpc.opType.SEND_INITIAL_METADATA] =
-          responseMetadata._getCoreRepresentation();
-      call.startBatch(batch, function() {});
-    }
-  };
   stream.on('error', function(error) {
     handleError(call, error);
   });
-  waitForCancel(call, stream);
+  stream.waitForCancel();
   stream.metadata = metadata;
   handler.func(stream, function(err, value, trailer, flags) {
     stream.terminate();
@@ -574,7 +561,7 @@ function handleClientStreaming(call, handler, metadata) {
 function handleBidiStreaming(call, handler, metadata) {
   var stream = new ServerDuplexStream(call, handler.serialize,
                                       handler.deserialize);
-  waitForCancel(call, stream);
+  stream.waitForCancel();
   stream.metadata = metadata;
   handler.func(stream);
 }

test/surface_test.js

@@ -312,6 +312,54 @@ describe('Generic client and server', function() {
     });
   });
 });
+describe('Server-side getPeer', function() {
+  function toString(val) {
+    return val.toString();
+  }
+  function toBuffer(str) {
+    return new Buffer(str);
+  }
+  var string_service_attrs = {
+    'getPeer' : {
+      path: '/string/getPeer',
+      requestStream: false,
+      responseStream: false,
+      requestSerialize: toBuffer,
+      requestDeserialize: toString,
+      responseSerialize: toBuffer,
+      responseDeserialize: toString
+    }
+  };
+  var client;
+  var server;
+  before(function() {
+    server = new grpc.Server();
+    server.addService(string_service_attrs, {
+      getPeer: function(call, callback) {
+        try {
+          callback(null, call.getPeer());
+        } catch (e) {
+          call.emit('error', e);
+        }
+      }
+    });
+    var port = server.bind('localhost:0', server_insecure_creds);
+    server.start();
+    var Client = grpc.makeGenericClientConstructor(string_service_attrs);
+    client = new Client('localhost:' + port,
+                        grpc.credentials.createInsecure());
+  });
+  after(function() {
+    server.forceShutdown();
+  });
+  it('should respond with a string representing the client', function(done) {
+    client.getPeer('', function(err, response) {
+      assert.ifError(err);
+      // We don't expect a specific value, just that it worked without error
+      done();
+    });
+  });
+});
 describe('Echo metadata', function() {
   var client;
   var server;