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diff --git a/src/cpp/ext/proto_server_reflection.cc b/src/cpp/ext/proto_server_reflection.cc
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+++ b/src/cpp/ext/proto_server_reflection.cc
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+/*
+ *
+ * Copyright 2016, 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.
+ *
+ */
+
+#include <unordered_set>
+#include <vector>
+
+#include <grpc++/grpc++.h>
+
+#include "src/cpp/ext/proto_server_reflection.h"
+
+using grpc::Status;
+using grpc::StatusCode;
+using grpc::reflection::v1alpha::ServerReflectionRequest;
+using grpc::reflection::v1alpha::ExtensionRequest;
+using grpc::reflection::v1alpha::ServerReflectionResponse;
+using grpc::reflection::v1alpha::ListServiceResponse;
+using grpc::reflection::v1alpha::ServiceResponse;
+using grpc::reflection::v1alpha::ExtensionNumberResponse;
+using grpc::reflection::v1alpha::ErrorResponse;
+using grpc::reflection::v1alpha::FileDescriptorResponse;
+
+namespace grpc {
+
+ProtoServerReflection::ProtoServerReflection()
+    : descriptor_pool_(protobuf::DescriptorPool::generated_pool()) {}
+
+void ProtoServerReflection::SetServiceList(
+    const std::vector<grpc::string>* services) {
+  services_ = services;
+}
+
+Status ProtoServerReflection::ServerReflectionInfo(
+    ServerContext* context,
+    ServerReaderWriter<ServerReflectionResponse, ServerReflectionRequest>*
+        stream) {
+  ServerReflectionRequest request;
+  ServerReflectionResponse response;
+  Status status;
+  while (stream->Read(&request)) {
+    switch (request.message_request_case()) {
+      case ServerReflectionRequest::MessageRequestCase::kFileByFilename:
+        status = GetFileByName(context, request.file_by_filename(), &response);
+        break;
+      case ServerReflectionRequest::MessageRequestCase::kFileContainingSymbol:
+        status = GetFileContainingSymbol(
+            context, request.file_containing_symbol(), &response);
+        break;
+      case ServerReflectionRequest::MessageRequestCase::
+          kFileContainingExtension:
+        status = GetFileContainingExtension(
+            context, &request.file_containing_extension(), &response);
+        break;
+      case ServerReflectionRequest::MessageRequestCase::
+          kAllExtensionNumbersOfType:
+        status = GetAllExtensionNumbers(
+            context, request.all_extension_numbers_of_type(),
+            response.mutable_all_extension_numbers_response());
+        break;
+      case ServerReflectionRequest::MessageRequestCase::kListServices:
+        status =
+            ListService(context, response.mutable_list_services_response());
+        break;
+      default:
+        status = Status(StatusCode::UNIMPLEMENTED, "");
+    }
+
+    if (!status.ok()) {
+      FillErrorResponse(status, response.mutable_error_response());
+    }
+    response.set_valid_host(request.host());
+    response.set_allocated_original_request(
+        new ServerReflectionRequest(request));
+    stream->Write(response);
+  }
+
+  return Status::OK;
+}
+
+void ProtoServerReflection::FillErrorResponse(const Status& status,
+                                              ErrorResponse* error_response) {
+  error_response->set_error_code(status.error_code());
+  error_response->set_error_message(status.error_message());
+}
+
+Status ProtoServerReflection::ListService(ServerContext* context,
+                                          ListServiceResponse* response) {
+  if (services_ == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "Services not found.");
+  }
+  for (auto it = services_->begin(); it != services_->end(); ++it) {
+    ServiceResponse* service_response = response->add_service();
+    service_response->set_name(*it);
+  }
+  return Status::OK;
+}
+
+Status ProtoServerReflection::GetFileByName(
+    ServerContext* context, const grpc::string& filename,
+    ServerReflectionResponse* response) {
+  if (descriptor_pool_ == nullptr) {
+    return Status::CANCELLED;
+  }
+
+  const protobuf::FileDescriptor* file_desc =
+      descriptor_pool_->FindFileByName(filename);
+  if (file_desc == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "File not found.");
+  }
+  std::unordered_set<grpc::string> seen_files;
+  FillFileDescriptorResponse(file_desc, response, &seen_files);
+  return Status::OK;
+}
+
+Status ProtoServerReflection::GetFileContainingSymbol(
+    ServerContext* context, const grpc::string& symbol,
+    ServerReflectionResponse* response) {
+  if (descriptor_pool_ == nullptr) {
+    return Status::CANCELLED;
+  }
+
+  const protobuf::FileDescriptor* file_desc =
+      descriptor_pool_->FindFileContainingSymbol(symbol);
+  if (file_desc == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "Symbol not found.");
+  }
+  std::unordered_set<grpc::string> seen_files;
+  FillFileDescriptorResponse(file_desc, response, &seen_files);
+  return Status::OK;
+}
+
+Status ProtoServerReflection::GetFileContainingExtension(
+    ServerContext* context, const ExtensionRequest* request,
+    ServerReflectionResponse* response) {
+  if (descriptor_pool_ == nullptr) {
+    return Status::CANCELLED;
+  }
+
+  const protobuf::Descriptor* desc =
+      descriptor_pool_->FindMessageTypeByName(request->containing_type());
+  if (desc == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "Type not found.");
+  }
+
+  const protobuf::FieldDescriptor* field_desc =
+      descriptor_pool_->FindExtensionByNumber(desc,
+                                              request->extension_number());
+  if (field_desc == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "Extension not found.");
+  }
+  std::unordered_set<grpc::string> seen_files;
+  FillFileDescriptorResponse(field_desc->file(), response, &seen_files);
+  return Status::OK;
+}
+
+Status ProtoServerReflection::GetAllExtensionNumbers(
+    ServerContext* context, const grpc::string& type,
+    ExtensionNumberResponse* response) {
+  if (descriptor_pool_ == nullptr) {
+    return Status::CANCELLED;
+  }
+
+  const protobuf::Descriptor* desc =
+      descriptor_pool_->FindMessageTypeByName(type);
+  if (desc == nullptr) {
+    return Status(StatusCode::NOT_FOUND, "Type not found.");
+  }
+
+  std::vector<const protobuf::FieldDescriptor*> extensions;
+  descriptor_pool_->FindAllExtensions(desc, &extensions);
+  for (auto extension : extensions) {
+    response->add_extension_number(extension->number());
+  }
+  response->set_base_type_name(type);
+  return Status::OK;
+}
+
+void ProtoServerReflection::FillFileDescriptorResponse(
+    const protobuf::FileDescriptor* file_desc,
+    ServerReflectionResponse* response,
+    std::unordered_set<grpc::string>* seen_files) {
+  if (seen_files->find(file_desc->name()) != seen_files->end()) {
+    return;
+  }
+  seen_files->insert(file_desc->name());
+
+  protobuf::FileDescriptorProto file_desc_proto;
+  grpc::string data;
+  file_desc->CopyTo(&file_desc_proto);
+  file_desc_proto.SerializeToString(&data);
+  response->mutable_file_descriptor_response()->add_file_descriptor_proto(data);
+
+  for (int i = 0; i < file_desc->dependency_count(); ++i) {
+    FillFileDescriptorResponse(file_desc->dependency(i), response, seen_files);
+  }
+}
+
+}  // namespace grpc