diff options
Diffstat (limited to 'src/compiler/python_generator.cc')
| -rw-r--r-- | src/compiler/python_generator.cc | 477 |
1 files changed, 310 insertions, 167 deletions
diff --git a/src/compiler/python_generator.cc b/src/compiler/python_generator.cc index 6830f49931..0fac1b88cd 100644 --- a/src/compiler/python_generator.cc +++ b/src/compiler/python_generator.cc @@ -35,9 +35,12 @@ #include <cassert> #include <cctype> #include <cstring> +#include <fstream> +#include <iostream> #include <map> #include <memory> #include <ostream> +#include <set> #include <sstream> #include <tuple> #include <vector> @@ -62,70 +65,19 @@ using std::make_pair; using std::map; using std::pair; using std::replace; +using std::tuple; using std::vector; +using std::set; namespace grpc_python_generator { -GeneratorConfiguration::GeneratorConfiguration() - : grpc_package_root("grpc"), beta_package_root("grpc.beta") {} - -PythonGrpcGenerator::PythonGrpcGenerator(const GeneratorConfiguration& config) - : config_(config) {} - -PythonGrpcGenerator::~PythonGrpcGenerator() {} - -bool PythonGrpcGenerator::Generate(const FileDescriptor* file, - const grpc::string& parameter, - GeneratorContext* context, - grpc::string* error) const { - // Get output file name. - grpc::string file_name; - static const int proto_suffix_length = strlen(".proto"); - if (file->name().size() > static_cast<size_t>(proto_suffix_length) && - file->name().find_last_of(".proto") == file->name().size() - 1) { - file_name = - file->name().substr(0, file->name().size() - proto_suffix_length) + - "_pb2.py"; - } else { - *error = "Invalid proto file name. Proto file must end with .proto"; - return false; - } - - std::unique_ptr<ZeroCopyOutputStream> output( - context->OpenForInsert(file_name, "module_scope")); - CodedOutputStream coded_out(output.get()); - bool success = false; - grpc::string code = ""; - tie(success, code) = grpc_python_generator::GetServices(file, config_); - if (success) { - coded_out.WriteRaw(code.data(), code.size()); - return true; - } else { - return false; - } -} - namespace { -////////////////////////////////// -// BEGIN FORMATTING BOILERPLATE // -////////////////////////////////// - -// Converts an initializer list of the form { key0, value0, key1, value1, ... } -// into a map of key* to value*. Is merely a readability helper for later code. -map<grpc::string, grpc::string> ListToDict( - const initializer_list<grpc::string>& values) { - assert(values.size() % 2 == 0); - map<grpc::string, grpc::string> value_map; - auto value_iter = values.begin(); - for (unsigned i = 0; i < values.size() / 2; ++i) { - grpc::string key = *value_iter; - ++value_iter; - grpc::string value = *value_iter; - value_map[key] = value; - ++value_iter; - } - return value_map; -} + +typedef vector<const Descriptor*> DescriptorVector; +typedef map<grpc::string, grpc::string> StringMap; +typedef vector<grpc::string> StringVector; +typedef tuple<grpc::string, grpc::string> StringPair; +typedef set<StringPair> StringPairSet; // Provides RAII indentation handling. Use as: // { @@ -146,10 +98,6 @@ class IndentScope { Printer* printer_; }; -//////////////////////////////// -// END FORMATTING BOILERPLATE // -//////////////////////////////// - // TODO(https://github.com/google/protobuf/issues/888): // Export `ModuleName` from protobuf's // `src/google/protobuf/compiler/python/python_generator.cc` file. @@ -173,11 +121,61 @@ grpc::string ModuleAlias(const grpc::string& filename) { return module_name; } -bool GetModuleAndMessagePath(const Descriptor* type, - const ServiceDescriptor* service, - grpc::string* out) { +// Tucks all generator state in an anonymous namespace away from +// PythonGrpcGenerator and the header file, mostly to encourage future changes +// to not require updates to the grpcio-tools C++ code part. Assumes that it is +// only ever used from a single thread. +struct PrivateGenerator { + const GeneratorConfiguration& config; + const FileDescriptor* file; + + bool generate_in_pb2_grpc; + + Printer* out; + + PrivateGenerator(const GeneratorConfiguration& config, + const FileDescriptor* file); + + std::pair<bool, grpc::string> GetGrpcServices(); + + private: + bool PrintPreamble(); + bool PrintBetaPreamble(); + bool PrintGAServices(); + bool PrintBetaServices(); + + bool PrintAddServicerToServer( + const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service); + bool PrintServicer(const ServiceDescriptor* service); + bool PrintStub(const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service); + + bool PrintBetaServicer(const ServiceDescriptor* service); + bool PrintBetaServerFactory( + const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service); + bool PrintBetaStub(const ServiceDescriptor* service); + bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service); + + // Get all comments (leading, leading_detached, trailing) and print them as a + // docstring. Any leading space of a line will be removed, but the line + // wrapping will not be changed. + template <typename DescriptorType> + void PrintAllComments(const DescriptorType* descriptor); + + bool GetModuleAndMessagePath(const Descriptor* type, grpc::string* out); +}; + +PrivateGenerator::PrivateGenerator(const GeneratorConfiguration& config, + const FileDescriptor* file) + : config(config), file(file) {} + +bool PrivateGenerator::GetModuleAndMessagePath(const Descriptor* type, + grpc::string* out) { const Descriptor* path_elem_type = type; - vector<const Descriptor*> message_path; + DescriptorVector message_path; do { message_path.push_back(path_elem_type); path_elem_type = path_elem_type->containing_type(); @@ -188,12 +186,16 @@ bool GetModuleAndMessagePath(const Descriptor* type, file_name.find_last_of(".proto") == file_name.size() - 1)) { return false; } - grpc::string service_file_name = service->file()->name(); - grpc::string module = - service_file_name == file_name ? "" : ModuleAlias(file_name) + "."; + grpc::string generator_file_name = file->name(); + grpc::string module; + if (generator_file_name != file_name || generate_in_pb2_grpc) { + module = ModuleAlias(file_name) + "."; + } else { + module = ""; + } grpc::string message_type; - for (auto path_iter = message_path.rbegin(); path_iter != message_path.rend(); - ++path_iter) { + for (DescriptorVector::reverse_iterator path_iter = message_path.rbegin(); + path_iter != message_path.rend(); ++path_iter) { message_type += (*path_iter)->name() + "."; } // no pop_back prior to C++11 @@ -202,33 +204,31 @@ bool GetModuleAndMessagePath(const Descriptor* type, return true; } -// Get all comments (leading, leading_detached, trailing) and print them as a -// docstring. Any leading space of a line will be removed, but the line wrapping -// will not be changed. template <typename DescriptorType> -static void PrintAllComments(const DescriptorType* desc, Printer* printer) { - std::vector<grpc::string> comments; - grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_LEADING_DETACHED, +void PrivateGenerator::PrintAllComments(const DescriptorType* descriptor) { + StringVector comments; + grpc_generator::GetComment( + descriptor, grpc_generator::COMMENTTYPE_LEADING_DETACHED, &comments); + grpc_generator::GetComment(descriptor, grpc_generator::COMMENTTYPE_LEADING, &comments); - grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_LEADING, - &comments); - grpc_generator::GetComment(desc, grpc_generator::COMMENTTYPE_TRAILING, + grpc_generator::GetComment(descriptor, grpc_generator::COMMENTTYPE_TRAILING, &comments); if (comments.empty()) { return; } - printer->Print("\"\"\""); - for (auto it = comments.begin(); it != comments.end(); ++it) { + out->Print("\"\"\""); + for (StringVector::iterator it = comments.begin(); it != comments.end(); + ++it) { size_t start_pos = it->find_first_not_of(' '); if (start_pos != grpc::string::npos) { - printer->Print(it->c_str() + start_pos); + out->Print(it->c_str() + start_pos); } - printer->Print("\n"); + out->Print("\n"); } - printer->Print("\"\"\"\n"); + out->Print("\"\"\"\n"); } -bool PrintBetaServicer(const ServiceDescriptor* service, Printer* out) { +bool PrivateGenerator::PrintBetaServicer(const ServiceDescriptor* service) { out->Print("\n\n"); out->Print("class Beta$Service$Servicer(object):\n", "Service", service->name()); @@ -241,16 +241,16 @@ bool PrintBetaServicer(const ServiceDescriptor* service, Printer* out) { "generated\n" "only to ease transition from grpcio<0.15.0 to " "grpcio>=0.15.0.\"\"\"\n"); - PrintAllComments(service, out); + PrintAllComments(service); for (int i = 0; i < service->method_count(); ++i) { - auto meth = service->method(i); + const MethodDescriptor* method = service->method(i); grpc::string arg_name = - meth->client_streaming() ? "request_iterator" : "request"; + method->client_streaming() ? "request_iterator" : "request"; out->Print("def $Method$(self, $ArgName$, context):\n", "Method", - meth->name(), "ArgName", arg_name); + method->name(), "ArgName", arg_name); { IndentScope raii_method_indent(out); - PrintAllComments(meth, out); + PrintAllComments(method); out->Print("context.code(beta_interfaces.StatusCode.UNIMPLEMENTED)\n"); } } @@ -258,7 +258,7 @@ bool PrintBetaServicer(const ServiceDescriptor* service, Printer* out) { return true; } -bool PrintBetaStub(const ServiceDescriptor* service, Printer* out) { +bool PrivateGenerator::PrintBetaStub(const ServiceDescriptor* service) { out->Print("\n\n"); out->Print("class Beta$Service$Stub(object):\n", "Service", service->name()); { @@ -270,30 +270,33 @@ bool PrintBetaStub(const ServiceDescriptor* service, Printer* out) { "generated\n" "only to ease transition from grpcio<0.15.0 to " "grpcio>=0.15.0.\"\"\"\n"); - PrintAllComments(service, out); + PrintAllComments(service); for (int i = 0; i < service->method_count(); ++i) { - const MethodDescriptor* meth = service->method(i); + const MethodDescriptor* method = service->method(i); grpc::string arg_name = - meth->client_streaming() ? "request_iterator" : "request"; - auto methdict = ListToDict({"Method", meth->name(), "ArgName", arg_name}); - out->Print(methdict, + method->client_streaming() ? "request_iterator" : "request"; + StringMap method_dict; + method_dict["Method"] = method->name(); + method_dict["ArgName"] = arg_name; + out->Print(method_dict, "def $Method$(self, $ArgName$, timeout, metadata=None, " "with_call=False, protocol_options=None):\n"); { IndentScope raii_method_indent(out); - PrintAllComments(meth, out); + PrintAllComments(method); out->Print("raise NotImplementedError()\n"); } - if (!meth->server_streaming()) { - out->Print(methdict, "$Method$.future = None\n"); + if (!method->server_streaming()) { + out->Print(method_dict, "$Method$.future = None\n"); } } } return true; } -bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, - const ServiceDescriptor* service, Printer* out) { +bool PrivateGenerator::PrintBetaServerFactory( + const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service) { out->Print("\n\n"); out->Print( "def beta_create_$Service$_server(servicer, pool=None, " @@ -307,9 +310,9 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, "file not marked beta) for all further purposes. This function was\n" "generated only to ease transition from grpcio<0.15.0 to grpcio>=0.15.0" "\"\"\"\n"); - map<grpc::string, grpc::string> method_implementation_constructors; - map<grpc::string, grpc::string> input_message_modules_and_classes; - map<grpc::string, grpc::string> output_message_modules_and_classes; + StringMap method_implementation_constructors; + StringMap input_message_modules_and_classes; + StringMap output_message_modules_and_classes; for (int i = 0; i < service->method_count(); ++i) { const MethodDescriptor* method = service->method(i); const grpc::string method_implementation_constructor = @@ -317,12 +320,12 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, grpc::string(method->server_streaming() ? "stream_" : "unary_") + "inline"; grpc::string input_message_module_and_class; - if (!GetModuleAndMessagePath(method->input_type(), service, + if (!GetModuleAndMessagePath(method->input_type(), &input_message_module_and_class)) { return false; } grpc::string output_message_module_and_class; - if (!GetModuleAndMessagePath(method->output_type(), service, + if (!GetModuleAndMessagePath(method->output_type(), &output_message_module_and_class)) { return false; } @@ -334,7 +337,7 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, make_pair(method->name(), output_message_module_and_class)); } out->Print("request_deserializers = {\n"); - for (auto name_and_input_module_class_pair = + for (StringMap::iterator name_and_input_module_class_pair = input_message_modules_and_classes.begin(); name_and_input_module_class_pair != input_message_modules_and_classes.end(); @@ -349,7 +352,7 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, } out->Print("}\n"); out->Print("response_serializers = {\n"); - for (auto name_and_output_module_class_pair = + for (StringMap::iterator name_and_output_module_class_pair = output_message_modules_and_classes.begin(); name_and_output_module_class_pair != output_message_modules_and_classes.end(); @@ -365,7 +368,7 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, } out->Print("}\n"); out->Print("method_implementations = {\n"); - for (auto name_and_implementation_constructor = + for (StringMap::iterator name_and_implementation_constructor = method_implementation_constructors.begin(); name_and_implementation_constructor != method_implementation_constructors.end(); @@ -395,11 +398,11 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name, return true; } -bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, - const ServiceDescriptor* service, Printer* out) { - map<grpc::string, grpc::string> dict = ListToDict({ - "Service", service->name(), - }); +bool PrivateGenerator::PrintBetaStubFactory( + const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service) { + StringMap dict; + dict["Service"] = service->name(); out->Print("\n\n"); out->Print(dict, "def beta_create_$Service$_stub(channel, host=None," @@ -412,21 +415,21 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, "file not marked beta) for all further purposes. This function was\n" "generated only to ease transition from grpcio<0.15.0 to grpcio>=0.15.0" "\"\"\"\n"); - map<grpc::string, grpc::string> method_cardinalities; - map<grpc::string, grpc::string> input_message_modules_and_classes; - map<grpc::string, grpc::string> output_message_modules_and_classes; + StringMap method_cardinalities; + StringMap input_message_modules_and_classes; + StringMap output_message_modules_and_classes; for (int i = 0; i < service->method_count(); ++i) { const MethodDescriptor* method = service->method(i); const grpc::string method_cardinality = grpc::string(method->client_streaming() ? "STREAM" : "UNARY") + "_" + grpc::string(method->server_streaming() ? "STREAM" : "UNARY"); grpc::string input_message_module_and_class; - if (!GetModuleAndMessagePath(method->input_type(), service, + if (!GetModuleAndMessagePath(method->input_type(), &input_message_module_and_class)) { return false; } grpc::string output_message_module_and_class; - if (!GetModuleAndMessagePath(method->output_type(), service, + if (!GetModuleAndMessagePath(method->output_type(), &output_message_module_and_class)) { return false; } @@ -438,7 +441,7 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, make_pair(method->name(), output_message_module_and_class)); } out->Print("request_serializers = {\n"); - for (auto name_and_input_module_class_pair = + for (StringMap::iterator name_and_input_module_class_pair = input_message_modules_and_classes.begin(); name_and_input_module_class_pair != input_message_modules_and_classes.end(); @@ -453,7 +456,7 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, } out->Print("}\n"); out->Print("response_deserializers = {\n"); - for (auto name_and_output_module_class_pair = + for (StringMap::iterator name_and_output_module_class_pair = output_message_modules_and_classes.begin(); name_and_output_module_class_pair != output_message_modules_and_classes.end(); @@ -469,7 +472,8 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, } out->Print("}\n"); out->Print("cardinalities = {\n"); - for (auto name_and_cardinality = method_cardinalities.begin(); + for (StringMap::iterator name_and_cardinality = + method_cardinalities.begin(); name_and_cardinality != method_cardinalities.end(); name_and_cardinality++) { IndentScope raii_descriptions_indent(out); @@ -493,13 +497,14 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name, return true; } -bool PrintStub(const grpc::string& package_qualified_service_name, - const ServiceDescriptor* service, Printer* out) { +bool PrivateGenerator::PrintStub( + const grpc::string& package_qualified_service_name, + const ServiceDescriptor* service) { out->Print("\n\n"); out->Print("class $Service$Stub(object):\n", "Service", service->name()); { IndentScope raii_class_indent(out); - PrintAllComments(service, out); + PrintAllComments(service); out->Print("\n"); out->Print("def __init__(self, channel):\n"); { @@ -513,17 +518,17 @@ bool PrintStub(const grpc::string& package_qualified_service_name, } out->Print("\"\"\"\n"); for (int i = 0; i < service->method_count(); ++i) { - auto method = service->method(i); - auto multi_callable_constructor = + const MethodDescriptor* method = service->method(i); + grpc::string multi_callable_constructor = grpc::string(method->client_streaming() ? "stream" : "unary") + "_" + grpc::string(method->server_streaming() ? "stream" : "unary"); grpc::string request_module_and_class; - if (!GetModuleAndMessagePath(method->input_type(), service, + if (!GetModuleAndMessagePath(method->input_type(), &request_module_and_class)) { return false; } grpc::string response_module_and_class; - if (!GetModuleAndMessagePath(method->output_type(), service, + if (!GetModuleAndMessagePath(method->output_type(), &response_module_and_class)) { return false; } @@ -550,14 +555,14 @@ bool PrintStub(const grpc::string& package_qualified_service_name, return true; } -bool PrintServicer(const ServiceDescriptor* service, Printer* out) { +bool PrivateGenerator::PrintServicer(const ServiceDescriptor* service) { out->Print("\n\n"); out->Print("class $Service$Servicer(object):\n", "Service", service->name()); { IndentScope raii_class_indent(out); - PrintAllComments(service, out); + PrintAllComments(service); for (int i = 0; i < service->method_count(); ++i) { - auto method = service->method(i); + const MethodDescriptor* method = service->method(i); grpc::string arg_name = method->client_streaming() ? "request_iterator" : "request"; out->Print("\n"); @@ -565,7 +570,7 @@ bool PrintServicer(const ServiceDescriptor* service, Printer* out) { method->name(), "ArgName", arg_name); { IndentScope raii_method_indent(out); - PrintAllComments(method, out); + PrintAllComments(method); out->Print("context.set_code(grpc.StatusCode.UNIMPLEMENTED)\n"); out->Print("context.set_details('Method not implemented!')\n"); out->Print("raise NotImplementedError('Method not implemented!')\n"); @@ -575,9 +580,9 @@ bool PrintServicer(const ServiceDescriptor* service, Printer* out) { return true; } -bool PrintAddServicerToServer( +bool PrivateGenerator::PrintAddServicerToServer( const grpc::string& package_qualified_service_name, - const ServiceDescriptor* service, Printer* out) { + const ServiceDescriptor* service) { out->Print("\n\n"); out->Print("def add_$Service$Servicer_to_server(servicer, server):\n", "Service", service->name()); @@ -588,19 +593,19 @@ bool PrintAddServicerToServer( IndentScope raii_dict_first_indent(out); IndentScope raii_dict_second_indent(out); for (int i = 0; i < service->method_count(); ++i) { - auto method = service->method(i); - auto method_handler_constructor = + const MethodDescriptor* method = service->method(i); + grpc::string method_handler_constructor = grpc::string(method->client_streaming() ? "stream" : "unary") + "_" + grpc::string(method->server_streaming() ? "stream" : "unary") + "_rpc_method_handler"; grpc::string request_module_and_class; - if (!GetModuleAndMessagePath(method->input_type(), service, + if (!GetModuleAndMessagePath(method->input_type(), &request_module_and_class)) { return false; } grpc::string response_module_and_class; - if (!GetModuleAndMessagePath(method->output_type(), service, + if (!GetModuleAndMessagePath(method->output_type(), &response_module_and_class)) { return false; } @@ -635,53 +640,191 @@ bool PrintAddServicerToServer( return true; } -bool PrintPreamble(const FileDescriptor* file, - const GeneratorConfiguration& config, Printer* out) { - out->Print("import $Package$\n", "Package", config.grpc_package_root); +bool PrivateGenerator::PrintBetaPreamble() { out->Print("from $Package$ import implementations as beta_implementations\n", "Package", config.beta_package_root); out->Print("from $Package$ import interfaces as beta_interfaces\n", "Package", config.beta_package_root); + return true; +} + +bool PrivateGenerator::PrintPreamble() { + out->Print("import $Package$\n", "Package", config.grpc_package_root); out->Print("from grpc.framework.common import cardinality\n"); out->Print( "from grpc.framework.interfaces.face import utilities as " "face_utilities\n"); + if (generate_in_pb2_grpc) { + out->Print("\n"); + StringPairSet imports_set; + 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(j); + const Descriptor* types[2] = {method->input_type(), + method->output_type()}; + for (int k = 0; k < 2; ++k) { + const Descriptor* type = types[k]; + grpc::string type_file_name = type->file()->name(); + grpc::string module_name = ModuleName(type_file_name); + grpc::string module_alias = ModuleAlias(type_file_name); + imports_set.insert(std::make_tuple(module_name, module_alias)); + } + } + } + for (StringPairSet::iterator it = imports_set.begin(); + it != imports_set.end(); ++it) { + out->Print("import $ModuleName$ as $ModuleAlias$\n", "ModuleName", + std::get<0>(*it), "ModuleAlias", std::get<1>(*it)); + } + } return true; } -} // namespace +bool PrivateGenerator::PrintGAServices() { + grpc::string package = file->package(); + if (!package.empty()) { + package = package.append("."); + } + for (int i = 0; i < file->service_count(); ++i) { + const ServiceDescriptor* service = file->service(i); + grpc::string package_qualified_service_name = package + service->name(); + if (!(PrintStub(package_qualified_service_name, service) && + PrintServicer(service) && + PrintAddServicerToServer(package_qualified_service_name, service))) { + return false; + } + } + return true; +} -pair<bool, grpc::string> GetServices(const FileDescriptor* file, - const GeneratorConfiguration& config) { +bool PrivateGenerator::PrintBetaServices() { + grpc::string package = file->package(); + if (!package.empty()) { + package = package.append("."); + } + for (int i = 0; i < file->service_count(); ++i) { + const ServiceDescriptor* service = file->service(i); + grpc::string package_qualified_service_name = package + service->name(); + if (!(PrintBetaServicer(service) && PrintBetaStub(service) && + PrintBetaServerFactory(package_qualified_service_name, service) && + PrintBetaStubFactory(package_qualified_service_name, service))) { + return false; + } + } + return true; +} + +pair<bool, grpc::string> PrivateGenerator::GetGrpcServices() { grpc::string output; { // Scope the output stream so it closes and finalizes output to the string. StringOutputStream output_stream(&output); - Printer out(&output_stream, '$'); - if (!PrintPreamble(file, config, &out)) { - return make_pair(false, ""); - } - auto package = file->package(); - if (!package.empty()) { - package = package.append("."); - } - for (int i = 0; i < file->service_count(); ++i) { - auto service = file->service(i); - auto package_qualified_service_name = package + service->name(); - if (!(PrintStub(package_qualified_service_name, service, &out) && - PrintServicer(service, &out) && - PrintAddServicerToServer(package_qualified_service_name, service, - &out) && - PrintBetaServicer(service, &out) && PrintBetaStub(service, &out) && - PrintBetaServerFactory(package_qualified_service_name, service, - &out) && - PrintBetaStubFactory(package_qualified_service_name, service, - &out))) { + Printer out_printer(&output_stream, '$'); + out = &out_printer; + + if (generate_in_pb2_grpc) { + if (!PrintPreamble()) { + return make_pair(false, ""); + } + if (!PrintGAServices()) { return make_pair(false, ""); } + } else { + out->Print("try:\n"); + { + IndentScope raii_dict_try_indent(out); + out->Print( + "# THESE ELEMENTS WILL BE DEPRECATED.\n" + "# Please use the generated *_pb2_grpc.py files instead.\n"); + if (!PrintPreamble()) { + return make_pair(false, ""); + } + if (!PrintBetaPreamble()) { + return make_pair(false, ""); + } + if (!PrintGAServices()) { + return make_pair(false, ""); + } + if (!PrintBetaServices()) { + return make_pair(false, ""); + } + } + out->Print("except ImportError:\n"); + { + IndentScope raii_dict_except_indent(out); + out->Print("pass"); + } } } return make_pair(true, std::move(output)); } +} // namespace + +GeneratorConfiguration::GeneratorConfiguration() + : grpc_package_root("grpc"), beta_package_root("grpc.beta") {} + +PythonGrpcGenerator::PythonGrpcGenerator(const GeneratorConfiguration& config) + : config_(config) {} + +PythonGrpcGenerator::~PythonGrpcGenerator() {} + +static bool GenerateGrpc(GeneratorContext* context, PrivateGenerator& generator, + grpc::string file_name, bool generate_in_pb2_grpc) { + bool success; + std::unique_ptr<ZeroCopyOutputStream> output; + std::unique_ptr<CodedOutputStream> coded_output; + grpc::string grpc_code; + + if (generate_in_pb2_grpc) { + output.reset(context->Open(file_name)); + generator.generate_in_pb2_grpc = true; + } else { + output.reset(context->OpenForInsert(file_name, "module_scope")); + generator.generate_in_pb2_grpc = false; + } + + coded_output.reset(new CodedOutputStream(output.get())); + tie(success, grpc_code) = generator.GetGrpcServices(); + + if (success) { + coded_output->WriteRaw(grpc_code.data(), grpc_code.size()); + return true; + } else { + return false; + } +} + +bool PythonGrpcGenerator::Generate(const FileDescriptor* file, + const grpc::string& parameter, + GeneratorContext* context, + grpc::string* error) const { + // Get output file name. + grpc::string pb2_file_name; + grpc::string pb2_grpc_file_name; + static const int proto_suffix_length = strlen(".proto"); + if (file->name().size() > static_cast<size_t>(proto_suffix_length) && + file->name().find_last_of(".proto") == file->name().size() - 1) { + grpc::string base = + file->name().substr(0, file->name().size() - proto_suffix_length); + pb2_file_name = base + "_pb2.py"; + pb2_grpc_file_name = base + "_pb2_grpc.py"; + } else { + *error = "Invalid proto file name. Proto file must end with .proto"; + return false; + } + + PrivateGenerator generator(config_, file); + if (parameter == "grpc_2_0") { + return GenerateGrpc(context, generator, pb2_grpc_file_name, true); + } else if (parameter == "") { + return GenerateGrpc(context, generator, pb2_grpc_file_name, true) && + GenerateGrpc(context, generator, pb2_file_name, false); + } else { + *error = "Invalid parameter '" + parameter + "'."; + return false; + } +} + } // namespace grpc_python_generator |