Created a Node grpc plugin

1 files changed, 273 insertions, 0 deletions

diff --git a/src/compiler/node_generator.cc b/src/compiler/node_generator.cc
new file mode 100644
index 0000000000..00db79cabb
--- /dev/null
+++ b/src/compiler/node_generator.cc
@@ -0,0 +1,273 @@
+/*
+ *
+ * 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 <map>
+
+#include "src/compiler/config.h"
+#include "src/compiler/generator_helpers.h"
+#include "src/compiler/node_generator_helpers.h"
+
+using grpc::protobuf::FileDescriptor;
+using grpc::protobuf::ServiceDescriptor;
+using grpc::protobuf::MethodDescriptor;
+using grpc::protobuf::Descriptor;
+using grpc::protobuf::io::Printer;
+using grpc::protobuf::io::StringOutputStream;
+using std::map;
+
+namespace grpc_node_generator {
+namespace {
+
+// Returns the alias we assign to the module of the given .proto filename
+// when importing. Copied entirely from
+// github:google/protobuf/src/google/protobuf/compiler/js/js_generator.cc#L154
+grpc::string ModuleAlias(const grpc::string filename) {
+  // This scheme could technically cause problems if a file includes any 2 of:
+  //   foo/bar_baz.proto
+  //   foo_bar_baz.proto
+  //   foo_bar/baz.proto
+  //
+  // We'll worry about this problem if/when we actually see it.  This name isn't
+  // exposed to users so we can change it later if we need to.
+  grpc::string basename = grpc_generator::StripProto(filename);
+  basename = grpc_generator::StringReplace(basename, "-", "$");
+  basename = grpc_generator::StringReplace(basename, "/", "_");
+  return basename + "_pb";
+}
+
+// Given a filename like foo/bar/baz.proto, returns the corresponding JavaScript
+// message file foo/bar/baz.js
+grpc::string GetJSMessageFilename(const grpc::string& filename) {
+  grpc::string name = filename;
+  return grpc_generator::StripProto(name) + "_pb.js";
+}
+
+// Given a filename like foo/bar/baz.proto, returns the root directory
+// path ../../
+grpc::string GetRootPath(const grpc::string& filename) {
+  size_t slashes = std::count(filename.begin(), filename.end(), '/');
+  if (slashes == 0) {
+    return "./";
+  }
+  grpc::string result = "";
+  for (size_t i = 0; i < slashes; i++) {
+    result += "../";
+  }
+  return result;
+}
+
+// Return the relative path to load to_file from the directory containing
+// from_file, assuming that both paths are relative to the same directory
+grpc::string GetRelativePath(const grpc::string& from_file,
+                             const grpc::string& to_file) {
+  return GetRootPath(from_file) + to_file;
+}
+
+/* Finds all message types used in all services in the file, and returns them
+ * as a map of fully qualified message type name to message descriptor */
+map<grpc::string, const Descriptor*> GetAllMessages(const FileDescriptor *file) {
+  map<grpc::string, const Descriptor*> message_types;
+  for (int i = 0; i < file->service_count(); i++) {
+    const ServiceDescriptor* service = file->service(i);
+    for (int j = 0; j < service->method_count(); j++) {
+      const MethodDescriptor* method = service->method(i);
+      const Descriptor* input_type = method->input_type();
+      const Descriptor* output_type = method->output_type();
+      message_types[input_type->name()] = input_type;
+      message_types[output_type->name()] = output_type;
+    }
+  }
+  return message_types;
+}
+
+grpc::string MessageIdentifierName(const grpc::string& name) {
+  return grpc_generator::StringReplace(name, ".", "_");
+}
+
+grpc::string NodeObjectPath(const Descriptor *descriptor) {
+  grpc::string module_alias = ModuleAlias(descriptor->file()->name());
+  grpc::string name = descriptor->name();
+  grpc_generator::StripPrefix(&name, descriptor->file()->package() + ".");
+  return module_alias + "." + name;
+}
+
+// Prints out the message serializer and deserializer functions
+void PrintMessageTransformer(const Descriptor *descriptor, Printer *out) {
+  map<grpc::string, grpc::string> template_vars;
+  template_vars["identifier_name"] = MessageIdentifierName(descriptor->name());
+  template_vars["name"] = descriptor->name();
+  template_vars["node_name"] = NodeObjectPath(descriptor);
+  // Print the serializer
+  out->Print(template_vars, "function serialize_$identifier_name$(arg) {\n");
+  out->Indent();
+  out->Print(template_vars, "if (!(arg instanceof $node_name$)) {\n");
+  out->Indent();
+  out->Print(template_vars,
+             "throw new Error('Expected argument of type $name$');\n");
+  out->Outdent();
+  out->Print("}\n");
+  out->Print("return new Buffer(arg.serializeBinary());\n");
+  out->Outdent();
+  out->Print("}\n");
+
+  // Print the deserializer
+  out->Print(template_vars,
+             "function deserialize_$identifier_name$(buffer_arg) {\n");
+  out->Indent();
+  out->Print(
+      template_vars,
+      "return $node_name$.deserializeBinary(new Uint8Array(buffer_arg));\n");
+  out->Outdent();
+  out->Print("}\n");
+}
+
+void PrintMethod(const MethodDescriptor *method, Printer *out) {
+  const Descriptor *input_type = method->input_type();
+  const Descriptor *output_type = method->output_type();
+  map<grpc::string, grpc::string> vars;
+  vars["service_name"] = method->service()->full_name();
+  vars["name"] = method->name();
+  vars["input_type"] = NodeObjectPath(input_type);
+  vars["input_type_id"] = MessageIdentifierName(input_type->name());
+  vars["output_type"] = NodeObjectPath(output_type);
+  vars["output_type_id"] = MessageIdentifierName(output_type->name());
+  vars["client_stream"] = method->client_streaming() ? "true" : "false";
+  vars["server_stream"] = method->server_streaming() ? "true" : "false";
+  out->Print("{\n");
+  out->Indent();
+  out->Print(vars, "path: '/$service_name$/$name$',\n");
+  out->Print(vars, "requestStream: $client_stream$,\n");
+  out->Print(vars, "responseStream: $server_stream$,\n");
+  out->Print(vars, "requestType: $input_type$,\n");
+  out->Print(vars, "responseType: $output_type$,\n");
+  out->Print(vars, "requestSerialize: serialize_$input_type_id$,\n");
+  out->Print(vars, "requestDeserialize: deserialize_$input_type_id$,\n");
+  out->Print(vars, "responseSerialize: serialize_$output_type_id$,\n");
+  out->Print(vars, "responseDeserialize: deserialize_$output_type_id$,\n");
+  out->Outdent();
+  out->Print("}");
+}
+
+// Prints out the service descriptor object
+void PrintService(const ServiceDescriptor *service, Printer *out) {
+  map<grpc::string, grpc::string> template_vars;
+  template_vars["name"] = service->name();
+  out->Print(template_vars, "var $name$Service = exports.$name$Service = {\n");
+  out->Indent();
+  for (int i = 0; i < service->method_count(); i++) {
+    grpc::string method_name = grpc_generator::LowercaseFirstLetter(
+        service->method(i)->name());
+    out->Print("$method_name$: ",
+               "method_name", method_name);
+    PrintMethod(service->method(i), out);
+    out->Print(",\n");
+  }
+  out->Outdent();
+  out->Print("};\n\n");
+  out->Print(template_vars, "exports.$name$Client = "
+             "grpc.makeGenericClientConstructor($name$Service);\n");
+}
+
+}
+
+grpc::string GetImports(const FileDescriptor *file) {
+  grpc::string output;
+  {
+    StringOutputStream output_stream(&output);
+    Printer out(&output_stream, '$');
+
+    if (file->service_count() == 0) {
+      return output;
+    }
+
+    out.Print("var grpc = require('grpc');\n");
+    if (file->message_type_count() > 0) {
+      grpc::string file_path = GetRelativePath(file->name(),
+                                               GetJSMessageFilename(
+                                                   file->name()));
+      out.Print("var $module_alias$ = require('$file_path$');\n",
+                "module_alias", ModuleAlias(file->name()),
+                "file_path", file_path);
+    }
+
+    for (int i = 0; i < file->dependency_count(); i++) {
+      grpc::string file_path = GetRelativePath(
+          file->name(), GetJSMessageFilename(file->dependency(i)->name()));
+      out.Print("var $module_alias$ = require('$file_path$');\n",
+                "module_alias", ModuleAlias(file->dependency(i)->name()),
+                "file_path", file_path);
+    }
+    out.Print("\n");
+  }
+  return output;
+}
+
+grpc::string GetTransformers(const FileDescriptor *file) {
+  grpc::string output;
+  {
+    StringOutputStream output_stream(&output);
+    Printer out(&output_stream, '$');
+
+    if (file->service_count() == 0) {
+      return output;
+    }
+
+    map<grpc::string, const Descriptor*> messages = GetAllMessages(file);
+    for (std::map<grpc::string, const Descriptor*>::iterator it =
+             messages.begin();
+         it != messages.end(); it++) {
+      PrintMessageTransformer(it->second, &out);
+    }
+    out.Print("\n");
+  }
+  return output;
+}
+
+grpc::string GetServices(const FileDescriptor *file) {
+  grpc::string output;
+  {
+    StringOutputStream output_stream(&output);
+    Printer out(&output_stream, '$');
+
+    if (file->service_count() == 0) {
+      return output;
+    }
+
+    for (int i = 0; i < file->service_count(); i++) {
+      PrintService(file->service(i), &out);
+    }
+  }
+  return output;
+}
+
+}  // namespace grpc_node_generator