72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Protocol Buffers - Google's data interchange format
|
|
// Copyright 2023 Google LLC. All rights reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://developers.google.com/open-source/licenses/bsd
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
|
|
#include "google/protobuf/compiler/plugin.upb.h"
|
|
#include "upb/base/status.h"
|
|
#include "upb/base/string_view.h"
|
|
#include "upb/mem/arena.h"
|
|
#include "upb_generator/subprocess.h"
|
|
#include "upb_generator/upbdev.h"
|
|
|
|
static constexpr char kDefaultPlugin[] = "protoc_dart_plugin";
|
|
|
|
int main() {
|
|
upb_Arena* a = upb_Arena_New();
|
|
upb_Status status;
|
|
upb_Status_Clear(&status);
|
|
|
|
// Read (binary) stdin into a string.
|
|
const std::string input = {std::istreambuf_iterator<char>(std::cin),
|
|
std::istreambuf_iterator<char>()};
|
|
|
|
// Parse the request.
|
|
auto inner_request = google_protobuf_compiler_CodeGeneratorRequest_parse(
|
|
input.c_str(), input.size(), a);
|
|
|
|
// Check the request for a plugin name.
|
|
std::string plugin = kDefaultPlugin;
|
|
if (google_protobuf_compiler_CodeGeneratorRequest_has_parameter(inner_request)) {
|
|
auto param = google_protobuf_compiler_CodeGeneratorRequest_parameter(inner_request);
|
|
plugin = std::string(param.data, param.size);
|
|
}
|
|
|
|
// Wrap the request inside a upb_CodeGeneratorRequest and JSON-encode it.
|
|
const upb_StringView sv =
|
|
upbdev_ProcessInput(input.data(), input.size(), a, &status);
|
|
if (!upb_Status_IsOk(&status)) {
|
|
std::cerr << status.msg << '\n';
|
|
return -1;
|
|
}
|
|
|
|
// Launch the subprocess.
|
|
upb::generator::Subprocess subprocess;
|
|
subprocess.Start(plugin, upb::generator::Subprocess::SEARCH_PATH);
|
|
|
|
// Exchange JSON strings with the subprocess.
|
|
const std::string json_request = std::string(sv.data, sv.size);
|
|
std::string json_response, error;
|
|
const bool ok = subprocess.Communicate(json_request, &json_response, &error);
|
|
if (!ok) {
|
|
// Dump the JSON request to stderr if we can't launch the next plugin.
|
|
std::cerr << json_request << '\n';
|
|
return -1;
|
|
}
|
|
|
|
// Decode, serialize, and write the JSON response.
|
|
upbdev_ProcessOutput(json_response.data(), json_response.size(), a, &status);
|
|
if (!upb_Status_IsOk(&status)) {
|
|
std::cerr << status.msg << '\n';
|
|
return -1;
|
|
}
|
|
|
|
upb_Arena_Free(a);
|
|
return 0;
|
|
}
|