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grpc/src/compiler/cpp_generator.cc

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/*
*
* Copyright 2015, 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/cpp_generator.h"
#include "src/compiler/cpp_generator_helpers.h"
#include "src/compiler/config.h"
#include <sstream>
namespace grpc_cpp_generator {
namespace {
template <class T>
grpc::string as_string(T x) {
std::ostringstream out;
out << x;
return out.str();
}
bool NoStreaming(const grpc::protobuf::MethodDescriptor *method) {
return !method->client_streaming() && !method->server_streaming();
}
bool ClientOnlyStreaming(const grpc::protobuf::MethodDescriptor *method) {
return method->client_streaming() && !method->server_streaming();
}
bool ServerOnlyStreaming(const grpc::protobuf::MethodDescriptor *method) {
return !method->client_streaming() && method->server_streaming();
}
bool BidiStreaming(const grpc::protobuf::MethodDescriptor *method) {
return method->client_streaming() && method->server_streaming();
}
grpc::string FilenameIdentifier(const grpc::string &filename) {
grpc::string result;
for (unsigned i = 0; i < filename.size(); i++) {
char c = filename[i];
if (isalnum(c)) {
result.push_back(c);
} else {
static char hex[] = "0123456789abcdef";
result.push_back('_');
result.push_back(hex[(c >> 4) & 0xf]);
result.push_back(hex[c & 0xf]);
}
}
return result;
}
} // namespace
grpc::string GetHeaderPrologue(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
vars["filename"] = file->name();
vars["filename_identifier"] = FilenameIdentifier(file->name());
vars["filename_base"] = grpc_generator::StripProto(file->name());
printer.Print(vars, "// Generated by the gRPC protobuf plugin.\n");
printer.Print(vars,
"// If you make any local change, they will be lost.\n");
printer.Print(vars, "// source: $filename$\n");
printer.Print(vars, "#ifndef GRPC_$filename_identifier$__INCLUDED\n");
printer.Print(vars, "#define GRPC_$filename_identifier$__INCLUDED\n");
printer.Print(vars, "\n");
printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
printer.Print(vars, "\n");
}
return output;
}
grpc::string GetHeaderIncludes(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string temp =
"#include <grpc++/impl/internal_stub.h>\n"
"#include <grpc++/impl/rpc_method.h>\n"
"#include <grpc++/impl/proto_utils.h>\n"
"#include <grpc++/impl/service_type.h>\n"
"#include <grpc++/async_unary_call.h>\n"
"#include <grpc++/status.h>\n"
"#include <grpc++/stream.h>\n"
"#include <grpc++/stub_options.h>\n"
"\n"
"namespace grpc {\n"
"class CompletionQueue;\n"
"class ChannelInterface;\n"
"class RpcService;\n"
"class ServerCompletionQueue;\n"
"class ServerContext;\n"
"} // namespace grpc\n\n";
if (!file->package().empty()) {
std::vector<grpc::string> parts =
grpc_generator::tokenize(file->package(), ".");
for (auto part = parts.begin(); part != parts.end(); part++) {
temp.append("namespace ");
temp.append(*part);
temp.append(" {\n");
}
temp.append("\n");
}
return temp;
}
void PrintHeaderClientMethodInterfaces(
grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars, bool is_public) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (is_public) {
if (NoStreaming(method)) {
printer->Print(
*vars,
"virtual ::grpc::Status $Method$(::grpc::ClientContext* context, "
"const $Request$& request, $Response$* response) = 0;\n");
printer->Print(*vars,
"std::unique_ptr< "
"::grpc::ClientAsyncResponseReaderInterface< $Response$>> "
"Async$Method$(::grpc::ClientContext* context, "
"const $Request$& request, "
"::grpc::CompletionQueue* cq) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncResponseReaderInterface< $Response$>>("
"Async$Method$Raw(context, request, cq));\n");
printer->Outdent();
printer->Print("}\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientWriterInterface< $Request$>>"
" $Method$("
"::grpc::ClientContext* context, $Response$* response) {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< ::grpc::ClientWriterInterface< $Request$>>"
"($Method$Raw(context, response));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientAsyncWriterInterface< $Request$>>"
" Async$Method$(::grpc::ClientContext* context, $Response$* "
"response, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncWriterInterface< $Request$>>("
"Async$Method$Raw(context, response, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientReaderInterface< $Response$>>"
" $Method$(::grpc::ClientContext* context, const $Request$& request)"
" {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< ::grpc::ClientReaderInterface< $Response$>>"
"($Method$Raw(context, request));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientAsyncReaderInterface< $Response$>> "
"Async$Method$("
"::grpc::ClientContext* context, const $Request$& request, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncReaderInterface< $Response$>>("
"Async$Method$Raw(context, request, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
} else if (BidiStreaming(method)) {
printer->Print(*vars,
"std::unique_ptr< ::grpc::ClientReaderWriterInterface< "
"$Request$, $Response$>> "
"$Method$(::grpc::ClientContext* context) {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< "
"::grpc::ClientReaderWriterInterface< $Request$, $Response$>>("
"$Method$Raw(context));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(
*vars,
"std::unique_ptr< "
"::grpc::ClientAsyncReaderWriterInterface< $Request$, $Response$>> "
"Async$Method$(::grpc::ClientContext* context, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncReaderWriterInterface< $Request$, $Response$>>("
"Async$Method$Raw(context, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
}
} else {
if (NoStreaming(method)) {
printer->Print(
*vars,
"virtual ::grpc::ClientAsyncResponseReaderInterface< $Response$>* "
"Async$Method$Raw(::grpc::ClientContext* context, "
"const $Request$& request, "
"::grpc::CompletionQueue* cq) = 0;\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"virtual ::grpc::ClientWriterInterface< $Request$>*"
" $Method$Raw("
"::grpc::ClientContext* context, $Response$* response) = 0;\n");
printer->Print(*vars,
"virtual ::grpc::ClientAsyncWriterInterface< $Request$>*"
" Async$Method$Raw(::grpc::ClientContext* context, "
"$Response$* response, "
"::grpc::CompletionQueue* cq, void* tag) = 0;\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"virtual ::grpc::ClientReaderInterface< $Response$>* $Method$Raw("
"::grpc::ClientContext* context, const $Request$& request) = 0;\n");
printer->Print(
*vars,
"virtual ::grpc::ClientAsyncReaderInterface< $Response$>* "
"Async$Method$Raw("
"::grpc::ClientContext* context, const $Request$& request, "
"::grpc::CompletionQueue* cq, void* tag) = 0;\n");
} else if (BidiStreaming(method)) {
printer->Print(*vars,
"virtual ::grpc::ClientReaderWriterInterface< $Request$, "
"$Response$>* "
"$Method$Raw(::grpc::ClientContext* context) = 0;\n");
printer->Print(*vars,
"virtual ::grpc::ClientAsyncReaderWriterInterface< "
"$Request$, $Response$>* "
"Async$Method$Raw(::grpc::ClientContext* context, "
"::grpc::CompletionQueue* cq, void* tag) = 0;\n");
}
}
}
void PrintHeaderClientMethod(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars,
bool is_public) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (is_public) {
if (NoStreaming(method)) {
printer->Print(
*vars,
"::grpc::Status $Method$(::grpc::ClientContext* context, "
"const $Request$& request, $Response$* response) GRPC_OVERRIDE;\n");
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientAsyncResponseReader< $Response$>> "
"Async$Method$(::grpc::ClientContext* context, "
"const $Request$& request, "
"::grpc::CompletionQueue* cq) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncResponseReader< $Response$>>("
"Async$Method$Raw(context, request, cq));\n");
printer->Outdent();
printer->Print("}\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientWriter< $Request$>>"
" $Method$("
"::grpc::ClientContext* context, $Response$* response) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< ::grpc::ClientWriter< $Request$>>"
"($Method$Raw(context, response));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(*vars,
"std::unique_ptr< ::grpc::ClientAsyncWriter< $Request$>>"
" Async$Method$(::grpc::ClientContext* context, "
"$Response$* response, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< ::grpc::ClientAsyncWriter< $Request$>>("
"Async$Method$Raw(context, response, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientReader< $Response$>>"
" $Method$(::grpc::ClientContext* context, const $Request$& request)"
" {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< ::grpc::ClientReader< $Response$>>"
"($Method$Raw(context, request));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientAsyncReader< $Response$>> "
"Async$Method$("
"::grpc::ClientContext* context, const $Request$& request, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(
*vars,
"return std::unique_ptr< ::grpc::ClientAsyncReader< $Response$>>("
"Async$Method$Raw(context, request, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"std::unique_ptr< ::grpc::ClientReaderWriter< $Request$, $Response$>>"
" $Method$(::grpc::ClientContext* context) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientReaderWriter< $Request$, $Response$>>("
"$Method$Raw(context));\n");
printer->Outdent();
printer->Print("}\n");
printer->Print(*vars,
"std::unique_ptr< ::grpc::ClientAsyncReaderWriter< "
"$Request$, $Response$>> "
"Async$Method$(::grpc::ClientContext* context, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Indent();
printer->Print(*vars,
"return std::unique_ptr< "
"::grpc::ClientAsyncReaderWriter< $Request$, $Response$>>("
"Async$Method$Raw(context, cq, tag));\n");
printer->Outdent();
printer->Print("}\n");
}
} else {
if (NoStreaming(method)) {
printer->Print(*vars,
"::grpc::ClientAsyncResponseReader< $Response$>* "
"Async$Method$Raw(::grpc::ClientContext* context, "
"const $Request$& request, "
"::grpc::CompletionQueue* cq) GRPC_OVERRIDE;\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(*vars,
"::grpc::ClientWriter< $Request$>* $Method$Raw("
"::grpc::ClientContext* context, $Response$* response) "
"GRPC_OVERRIDE;\n");
printer->Print(
*vars,
"::grpc::ClientAsyncWriter< $Request$>* Async$Method$Raw("
"::grpc::ClientContext* context, $Response$* response, "
"::grpc::CompletionQueue* cq, void* tag) GRPC_OVERRIDE;\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(*vars,
"::grpc::ClientReader< $Response$>* $Method$Raw("
"::grpc::ClientContext* context, const $Request$& request)"
" GRPC_OVERRIDE;\n");
printer->Print(
*vars,
"::grpc::ClientAsyncReader< $Response$>* Async$Method$Raw("
"::grpc::ClientContext* context, const $Request$& request, "
"::grpc::CompletionQueue* cq, void* tag) GRPC_OVERRIDE;\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"::grpc::ClientReaderWriter< $Request$, $Response$>* "
"$Method$Raw(::grpc::ClientContext* context) GRPC_OVERRIDE;\n");
printer->Print(
*vars,
"::grpc::ClientAsyncReaderWriter< $Request$, $Response$>* "
"Async$Method$Raw(::grpc::ClientContext* context, "
"::grpc::CompletionQueue* cq, void* tag) GRPC_OVERRIDE;\n");
}
}
}
void PrintHeaderClientMethodData(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
printer->Print(*vars, "const ::grpc::RpcMethod rpcmethod_$Method$_;\n");
}
void PrintHeaderServerMethodSync(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(*vars,
"virtual ::grpc::Status $Method$("
"::grpc::ServerContext* context, const $Request$* request, "
"$Response$* response);\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(*vars,
"virtual ::grpc::Status $Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerReader< $Request$>* reader, "
"$Response$* response);\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(*vars,
"virtual ::grpc::Status $Method$("
"::grpc::ServerContext* context, const $Request$* request, "
"::grpc::ServerWriter< $Response$>* writer);\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"virtual ::grpc::Status $Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerReaderWriter< $Response$, $Request$>* stream);"
"\n");
}
}
void PrintHeaderServerMethodAsync(
grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(
*vars,
"void Request$Method$("
"::grpc::ServerContext* context, $Request$* request, "
"::grpc::ServerAsyncResponseWriter< $Response$>* response, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag);\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"void Request$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerAsyncReader< $Response$, $Request$>* reader, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag);\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"void Request$Method$("
"::grpc::ServerContext* context, $Request$* request, "
"::grpc::ServerAsyncWriter< $Response$>* writer, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag);\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"void Request$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerAsyncReaderWriter< $Response$, $Request$>* stream, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag);\n");
}
}
void PrintHeaderService(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::ServiceDescriptor *service,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Service"] = service->name();
printer->Print(*vars,
"class $Service$ GRPC_FINAL {\n"
" public:\n");
printer->Indent();
// Client side
printer->Print(
"class StubInterface {\n"
" public:\n");
printer->Indent();
printer->Print("virtual ~StubInterface() {}\n");
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderClientMethodInterfaces(printer, service->method(i), vars, true);
}
printer->Outdent();
printer->Print("private:\n");
printer->Indent();
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderClientMethodInterfaces(printer, service->method(i), vars, false);
}
printer->Outdent();
printer->Print("};\n");
printer->Print(
"class Stub GRPC_FINAL : public StubInterface,"
" public ::grpc::InternalStub {\n public:\n");
printer->Indent();
printer->Print(
"Stub(const std::shared_ptr< ::grpc::ChannelInterface>& channel);\n");
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderClientMethod(printer, service->method(i), vars, true);
}
printer->Outdent();
printer->Print("\n private:\n");
printer->Indent();
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderClientMethod(printer, service->method(i), vars, false);
}
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderClientMethodData(printer, service->method(i), vars);
}
printer->Outdent();
printer->Print("};\n");
printer->Print(
"static std::unique_ptr<Stub> NewStub(const std::shared_ptr< "
"::grpc::ChannelInterface>& channel, "
"const ::grpc::StubOptions& options = ::grpc::StubOptions());\n");
printer->Print("\n");
// Server side - Synchronous
printer->Print(
"class Service : public ::grpc::SynchronousService {\n"
" public:\n");
printer->Indent();
printer->Print("Service() : service_(nullptr) {}\n");
printer->Print("virtual ~Service();\n");
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderServerMethodSync(printer, service->method(i), vars);
}
printer->Print("::grpc::RpcService* service() GRPC_OVERRIDE GRPC_FINAL;\n");
printer->Outdent();
printer->Print(
" private:\n"
" ::grpc::RpcService* service_;\n");
printer->Print("};\n");
// Server side - Asynchronous
printer->Print(
"class AsyncService GRPC_FINAL : public ::grpc::AsynchronousService {\n"
" public:\n");
printer->Indent();
(*vars)["MethodCount"] = as_string(service->method_count());
printer->Print("explicit AsyncService();\n");
printer->Print("~AsyncService() {};\n");
for (int i = 0; i < service->method_count(); ++i) {
PrintHeaderServerMethodAsync(printer, service->method(i), vars);
}
printer->Outdent();
printer->Print("};\n");
printer->Outdent();
printer->Print("};\n");
}
grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
if (!params.services_namespace.empty()) {
vars["services_namespace"] = params.services_namespace;
printer.Print(vars, "\nnamespace $services_namespace$ {\n\n");
}
for (int i = 0; i < file->service_count(); ++i) {
PrintHeaderService(&printer, file->service(i), &vars);
printer.Print("\n");
}
if (!params.services_namespace.empty()) {
printer.Print(vars, "} // namespace $services_namespace$\n\n");
}
}
return output;
}
grpc::string GetHeaderEpilogue(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
vars["filename"] = file->name();
vars["filename_identifier"] = FilenameIdentifier(file->name());
if (!file->package().empty()) {
std::vector<grpc::string> parts =
grpc_generator::tokenize(file->package(), ".");
for (auto part = parts.rbegin(); part != parts.rend(); part++) {
vars["part"] = *part;
printer.Print(vars, "} // namespace $part$\n");
}
printer.Print(vars, "\n");
}
printer.Print(vars, "\n");
printer.Print(vars, "#endif // GRPC_$filename_identifier$__INCLUDED\n");
}
return output;
}
grpc::string GetSourcePrologue(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
vars["filename"] = file->name();
vars["filename_base"] = grpc_generator::StripProto(file->name());
printer.Print(vars, "// Generated by the gRPC protobuf plugin.\n");
printer.Print(vars,
"// If you make any local change, they will be lost.\n");
printer.Print(vars, "// source: $filename$\n\n");
printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
printer.Print(vars, "#include \"$filename_base$.grpc.pb.h\"\n");
printer.Print(vars, "\n");
}
return output;
}
grpc::string GetSourceIncludes(const grpc::protobuf::FileDescriptor *file,
const Parameters &param) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
printer.Print(vars, "#include <grpc++/async_unary_call.h>\n");
printer.Print(vars, "#include <grpc++/channel_interface.h>\n");
printer.Print(vars, "#include <grpc++/impl/client_unary_call.h>\n");
printer.Print(vars, "#include <grpc++/impl/rpc_service_method.h>\n");
printer.Print(vars, "#include <grpc++/impl/service_type.h>\n");
printer.Print(vars, "#include <grpc++/stream.h>\n");
if (!file->package().empty()) {
std::vector<grpc::string> parts =
grpc_generator::tokenize(file->package(), ".");
for (auto part = parts.begin(); part != parts.end(); part++) {
vars["part"] = *part;
printer.Print(vars, "namespace $part$ {\n");
}
}
printer.Print(vars, "\n");
}
return output;
}
void PrintSourceClientMethod(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(*vars,
"::grpc::Status $ns$$Service$::Stub::$Method$("
"::grpc::ClientContext* context, "
"const $Request$& request, $Response$* response) {\n");
printer->Print(*vars,
" return ::grpc::BlockingUnaryCall(channel(), "
"rpcmethod_$Method$_, "
"context, request, response);\n"
"}\n\n");
printer->Print(
*vars,
"::grpc::ClientAsyncResponseReader< $Response$>* "
"$ns$$Service$::Stub::Async$Method$Raw(::grpc::ClientContext* context, "
"const $Request$& request, "
"::grpc::CompletionQueue* cq) {\n");
printer->Print(*vars,
" return new "
"::grpc::ClientAsyncResponseReader< $Response$>("
"channel(), cq, "
"rpcmethod_$Method$_, "
"context, request);\n"
"}\n\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(*vars,
"::grpc::ClientWriter< $Request$>* "
"$ns$$Service$::Stub::$Method$Raw("
"::grpc::ClientContext* context, $Response$* response) {\n");
printer->Print(*vars,
" return new ::grpc::ClientWriter< $Request$>("
"channel(), "
"rpcmethod_$Method$_, "
"context, response);\n"
"}\n\n");
printer->Print(*vars,
"::grpc::ClientAsyncWriter< $Request$>* "
"$ns$$Service$::Stub::Async$Method$Raw("
"::grpc::ClientContext* context, $Response$* response, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Print(*vars,
" return new ::grpc::ClientAsyncWriter< $Request$>("
"channel(), cq, "
"rpcmethod_$Method$_, "
"context, response, tag);\n"
"}\n\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"::grpc::ClientReader< $Response$>* "
"$ns$$Service$::Stub::$Method$Raw("
"::grpc::ClientContext* context, const $Request$& request) {\n");
printer->Print(*vars,
" return new ::grpc::ClientReader< $Response$>("
"channel(), "
"rpcmethod_$Method$_, "
"context, request);\n"
"}\n\n");
printer->Print(*vars,
"::grpc::ClientAsyncReader< $Response$>* "
"$ns$$Service$::Stub::Async$Method$Raw("
"::grpc::ClientContext* context, const $Request$& request, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Print(*vars,
" return new ::grpc::ClientAsyncReader< $Response$>("
"channel(), cq, "
"rpcmethod_$Method$_, "
"context, request, tag);\n"
"}\n\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"::grpc::ClientReaderWriter< $Request$, $Response$>* "
"$ns$$Service$::Stub::$Method$Raw(::grpc::ClientContext* context) {\n");
printer->Print(*vars,
" return new ::grpc::ClientReaderWriter< "
"$Request$, $Response$>("
"channel(), "
"rpcmethod_$Method$_, "
"context);\n"
"}\n\n");
printer->Print(
*vars,
"::grpc::ClientAsyncReaderWriter< $Request$, $Response$>* "
"$ns$$Service$::Stub::Async$Method$Raw(::grpc::ClientContext* context, "
"::grpc::CompletionQueue* cq, void* tag) {\n");
printer->Print(*vars,
" return new "
"::grpc::ClientAsyncReaderWriter< $Request$, $Response$>("
"channel(), cq, "
"rpcmethod_$Method$_, "
"context, tag);\n"
"}\n\n");
}
}
void PrintSourceServerMethod(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(*vars,
"::grpc::Status $ns$$Service$::Service::$Method$("
"::grpc::ServerContext* context, "
"const $Request$* request, $Response$* response) {\n");
printer->Print(" (void) context;\n");
printer->Print(" (void) request;\n");
printer->Print(" (void) response;\n");
printer->Print(
" return ::grpc::Status("
"::grpc::StatusCode::UNIMPLEMENTED, \"\");\n");
printer->Print("}\n\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(*vars,
"::grpc::Status $ns$$Service$::Service::$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerReader< $Request$>* reader, "
"$Response$* response) {\n");
printer->Print(" (void) context;\n");
printer->Print(" (void) reader;\n");
printer->Print(" (void) response;\n");
printer->Print(
" return ::grpc::Status("
"::grpc::StatusCode::UNIMPLEMENTED, \"\");\n");
printer->Print("}\n\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(*vars,
"::grpc::Status $ns$$Service$::Service::$Method$("
"::grpc::ServerContext* context, "
"const $Request$* request, "
"::grpc::ServerWriter< $Response$>* writer) {\n");
printer->Print(" (void) context;\n");
printer->Print(" (void) request;\n");
printer->Print(" (void) writer;\n");
printer->Print(
" return ::grpc::Status("
"::grpc::StatusCode::UNIMPLEMENTED, \"\");\n");
printer->Print("}\n\n");
} else if (BidiStreaming(method)) {
printer->Print(*vars,
"::grpc::Status $ns$$Service$::Service::$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerReaderWriter< $Response$, $Request$>* "
"stream) {\n");
printer->Print(" (void) context;\n");
printer->Print(" (void) stream;\n");
printer->Print(
" return ::grpc::Status("
"::grpc::StatusCode::UNIMPLEMENTED, \"\");\n");
printer->Print("}\n\n");
}
}
void PrintSourceServerAsyncMethod(
grpc::protobuf::io::Printer *printer,
const grpc::protobuf::MethodDescriptor *method,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(
*vars,
"void $ns$$Service$::AsyncService::Request$Method$("
"::grpc::ServerContext* context, "
"$Request$* request, "
"::grpc::ServerAsyncResponseWriter< $Response$>* response, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag) {\n");
printer->Print(*vars,
" AsynchronousService::RequestAsyncUnary($Idx$, context, "
"request, response, new_call_cq, notification_cq, tag);\n");
printer->Print("}\n\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"void $ns$$Service$::AsyncService::Request$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerAsyncReader< $Response$, $Request$>* reader, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag) {\n");
printer->Print(*vars,
" AsynchronousService::RequestClientStreaming($Idx$, "
"context, reader, new_call_cq, notification_cq, tag);\n");
printer->Print("}\n\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"void $ns$$Service$::AsyncService::Request$Method$("
"::grpc::ServerContext* context, "
"$Request$* request, "
"::grpc::ServerAsyncWriter< $Response$>* writer, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag) {\n");
printer->Print(
*vars,
" AsynchronousService::RequestServerStreaming($Idx$, "
"context, request, writer, new_call_cq, notification_cq, tag);\n");
printer->Print("}\n\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"void $ns$$Service$::AsyncService::Request$Method$("
"::grpc::ServerContext* context, "
"::grpc::ServerAsyncReaderWriter< $Response$, $Request$>* stream, "
"::grpc::CompletionQueue* new_call_cq, "
"::grpc::ServerCompletionQueue* notification_cq, void *tag) {\n");
printer->Print(*vars,
" AsynchronousService::RequestBidiStreaming($Idx$, "
"context, stream, new_call_cq, notification_cq, tag);\n");
printer->Print("}\n\n");
}
}
void PrintSourceService(grpc::protobuf::io::Printer *printer,
const grpc::protobuf::ServiceDescriptor *service,
std::map<grpc::string, grpc::string> *vars) {
(*vars)["Service"] = service->name();
printer->Print(*vars,
"static const char* $prefix$$Service$_method_names[] = {\n");
for (int i = 0; i < service->method_count(); ++i) {
(*vars)["Method"] = service->method(i)->name();
printer->Print(*vars, " \"/$Package$$Service$/$Method$\",\n");
}
printer->Print(*vars, "};\n\n");
printer->Print(
*vars,
"std::unique_ptr< $ns$$Service$::Stub> $ns$$Service$::NewStub("
"const std::shared_ptr< ::grpc::ChannelInterface>& channel, "
"const ::grpc::StubOptions& options) {\n"
" std::unique_ptr< $ns$$Service$::Stub> stub(new "
"$ns$$Service$::Stub(channel));\n"
" return stub;\n"
"}\n\n");
printer->Print(*vars,
"$ns$$Service$::Stub::Stub(const std::shared_ptr< "
"::grpc::ChannelInterface>& channel)\n");
printer->Indent();
printer->Print(": ::grpc::InternalStub(channel)");
for (int i = 0; i < service->method_count(); ++i) {
const grpc::protobuf::MethodDescriptor *method = service->method(i);
(*vars)["Method"] = method->name();
(*vars)["Idx"] = as_string(i);
if (NoStreaming(method)) {
(*vars)["StreamingType"] = "NORMAL_RPC";
} else if (ClientOnlyStreaming(method)) {
(*vars)["StreamingType"] = "CLIENT_STREAMING";
} else if (ServerOnlyStreaming(method)) {
(*vars)["StreamingType"] = "SERVER_STREAMING";
} else {
(*vars)["StreamingType"] = "BIDI_STREAMING";
}
printer->Print(
*vars,
", rpcmethod_$Method$_("
"$prefix$$Service$_method_names[$Idx$], "
"::grpc::RpcMethod::$StreamingType$, "
"channel->RegisterMethod($prefix$$Service$_method_names[$Idx$])"
")\n");
}
printer->Print("{}\n\n");
printer->Outdent();
for (int i = 0; i < service->method_count(); ++i) {
(*vars)["Idx"] = as_string(i);
PrintSourceClientMethod(printer, service->method(i), vars);
}
(*vars)["MethodCount"] = as_string(service->method_count());
printer->Print(*vars,
"$ns$$Service$::AsyncService::AsyncService() : "
"::grpc::AsynchronousService("
"$prefix$$Service$_method_names, $MethodCount$) "
"{}\n\n");
printer->Print(*vars,
"$ns$$Service$::Service::~Service() {\n"
" delete service_;\n"
"}\n\n");
for (int i = 0; i < service->method_count(); ++i) {
(*vars)["Idx"] = as_string(i);
PrintSourceServerMethod(printer, service->method(i), vars);
PrintSourceServerAsyncMethod(printer, service->method(i), vars);
}
printer->Print(*vars,
"::grpc::RpcService* $ns$$Service$::Service::service() {\n");
printer->Indent();
printer->Print(
"if (service_ != nullptr) {\n"
" return service_;\n"
"}\n");
printer->Print("service_ = new ::grpc::RpcService();\n");
for (int i = 0; i < service->method_count(); ++i) {
const grpc::protobuf::MethodDescriptor *method = service->method(i);
(*vars)["Idx"] = as_string(i);
(*vars)["Method"] = method->name();
(*vars)["Request"] =
grpc_cpp_generator::ClassName(method->input_type(), true);
(*vars)["Response"] =
grpc_cpp_generator::ClassName(method->output_type(), true);
if (NoStreaming(method)) {
printer->Print(
*vars,
"service_->AddMethod(new ::grpc::RpcServiceMethod(\n"
" $prefix$$Service$_method_names[$Idx$],\n"
" ::grpc::RpcMethod::NORMAL_RPC,\n"
" new ::grpc::RpcMethodHandler< $ns$$Service$::Service, "
"$Request$, "
"$Response$>(\n"
" std::mem_fn(&$ns$$Service$::Service::$Method$), this)));\n");
} else if (ClientOnlyStreaming(method)) {
printer->Print(
*vars,
"service_->AddMethod(new ::grpc::RpcServiceMethod(\n"
" $prefix$$Service$_method_names[$Idx$],\n"
" ::grpc::RpcMethod::CLIENT_STREAMING,\n"
" new ::grpc::ClientStreamingHandler< "
"$ns$$Service$::Service, $Request$, $Response$>(\n"
" std::mem_fn(&$ns$$Service$::Service::$Method$), this)));\n");
} else if (ServerOnlyStreaming(method)) {
printer->Print(
*vars,
"service_->AddMethod(new ::grpc::RpcServiceMethod(\n"
" $prefix$$Service$_method_names[$Idx$],\n"
" ::grpc::RpcMethod::SERVER_STREAMING,\n"
" new ::grpc::ServerStreamingHandler< "
"$ns$$Service$::Service, $Request$, $Response$>(\n"
" std::mem_fn(&$ns$$Service$::Service::$Method$), this)));\n");
} else if (BidiStreaming(method)) {
printer->Print(
*vars,
"service_->AddMethod(new ::grpc::RpcServiceMethod(\n"
" $prefix$$Service$_method_names[$Idx$],\n"
" ::grpc::RpcMethod::BIDI_STREAMING,\n"
" new ::grpc::BidiStreamingHandler< "
"$ns$$Service$::Service, $Request$, $Response$>(\n"
" std::mem_fn(&$ns$$Service$::Service::$Method$), this)));\n");
}
}
printer->Print("return service_;\n");
printer->Outdent();
printer->Print("}\n\n");
}
grpc::string GetSourceServices(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
grpc::protobuf::io::Printer printer(&output_stream, '$');
std::map<grpc::string, grpc::string> vars;
// Package string is empty or ends with a dot. It is used to fully qualify
// method names.
vars["Package"] = file->package();
if (!file->package().empty()) {
vars["Package"].append(".");
}
if (!params.services_namespace.empty()) {
vars["ns"] = params.services_namespace + "::";
vars["prefix"] = params.services_namespace;
} else {
vars["ns"] = "";
vars["prefix"] = "";
}
for (int i = 0; i < file->service_count(); ++i) {
PrintSourceService(&printer, file->service(i), &vars);
printer.Print("\n");
}
}
return output;
}
grpc::string GetSourceEpilogue(const grpc::protobuf::FileDescriptor *file,
const Parameters &params) {
grpc::string temp;
if (!file->package().empty()) {
std::vector<grpc::string> parts =
grpc_generator::tokenize(file->package(), ".");
for (auto part = parts.begin(); part != parts.end(); part++) {
temp.append("} // namespace ");
temp.append(*part);
temp.append("\n");
}
temp.append("\n");
}
return temp;
}
} // namespace grpc_cpp_generator