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tdlib-fork/td/telegram/ClientJson.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/ClientJson.h"
#include "td/telegram/td_api.h"
#include "td/telegram/td_api_json.h"
#include "td/utils/common.h"
#include "td/utils/JsonBuilder.h"
#include "td/utils/logging.h"
#include "td/utils/port/thread_local.h"
#include <utility>
namespace td {
static td_api::object_ptr<td_api::Function> get_return_error_function(Slice error_message) {
auto error = td_api::make_object<td_api::error>(400, error_message.str());
return td_api::make_object<td_api::testReturnError>(std::move(error));
}
static std::pair<td_api::object_ptr<td_api::Function>, string> to_request(Slice request) {
auto request_str = request.str();
auto r_json_value = json_decode(request_str);
if (r_json_value.is_error()) {
return {get_return_error_function(PSLICE()
<< "Failed to parse request as JSON object: " << r_json_value.error().message()),
string()};
}
auto json_value = r_json_value.move_as_ok();
if (json_value.type() != JsonValue::Type::Object) {
return {get_return_error_function("Expected a JSON object"), string()};
}
string extra;
if (has_json_object_field(json_value.get_object(), "@extra")) {
extra = json_encode<string>(
get_json_object_field(json_value.get_object(), "@extra", JsonValue::Type::Null).move_as_ok());
}
td_api::object_ptr<td_api::Function> func;
auto status = from_json(func, std::move(json_value));
if (status.is_error()) {
return {get_return_error_function(PSLICE()
<< "Failed to parse JSON object as TDLib request: " << status.error().message()),
std::move(extra)};
}
return std::make_pair(std::move(func), std::move(extra));
}
static std::string from_response(const td_api::Object &object, const string &extra) {
auto str = json_encode<string>(ToJson(object));
CHECK(!str.empty() && str.back() == '}');
if (!extra.empty()) {
str.pop_back();
str.reserve(str.size() + 11 + extra.size());
str += ",\"@extra\":";
str += extra;
str += '}';
}
return str;
}
static TD_THREAD_LOCAL std::string *current_output;
static CSlice store_string(std::string str) {
init_thread_local<std::string>(current_output);
*current_output = std::move(str);
return *current_output;
}
void ClientJson::send(Slice request) {
auto parsed_request = to_request(request);
std::uint64_t extra_id = extra_id_.fetch_add(1, std::memory_order_relaxed);
if (!parsed_request.second.empty()) {
std::lock_guard<std::mutex> guard(mutex_);
extra_[extra_id] = std::move(parsed_request.second);
}
client_.send(Client::Request{extra_id, std::move(parsed_request.first)});
}
CSlice ClientJson::receive(double timeout) {
auto response = client_.receive(timeout);
if (!response.object) {
return {};
}
std::string extra;
if (response.id != 0) {
std::lock_guard<std::mutex> guard(mutex_);
auto it = extra_.find(response.id);
if (it != extra_.end()) {
extra = std::move(it->second);
extra_.erase(it);
}
}
return store_string(from_response(*response.object, extra));
}
CSlice ClientJson::execute(Slice request) {
auto parsed_request = to_request(request);
return store_string(from_response(*Client::execute(Client::Request{0, std::move(parsed_request.first)}).object,
parsed_request.second));
}
} // namespace td