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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
//
// 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/FlatHashMap.h"
#include "td/utils/JsonBuilder.h"
#include "td/utils/port/thread_local.h"
#include "td/utils/SliceBuilder.h"
#include "td/utils/StackAllocator.h"
#include "td/utils/StringBuilder.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.message()),
std::move(extra)};
}
return std::make_pair(std::move(func), std::move(extra));
}
static string from_response(const td_api::Object &object, const string &extra, int client_id) {
auto buf = StackAllocator::alloc(1 << 18);
JsonBuilder jb(StringBuilder(buf.as_slice(), true), -1);
jb.enter_value() << ToJson(object);
auto &sb = jb.string_builder();
auto slice = sb.as_cslice();
CHECK(!slice.empty() && slice.back() == '}');
sb.pop_back();
if (!extra.empty()) {
sb << ",\"@extra\":" << extra;
}
if (client_id != 0) {
sb << ",\"@client_id\":" << client_id;
}
sb << '}';
return sb.as_cslice().str();
}
static TD_THREAD_LOCAL string *current_output;
static const char *store_string(string str) {
init_thread_local<string>(current_output);
*current_output = std::move(str);
return current_output->c_str();
}
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)});
}
const char *ClientJson::receive(double timeout) {
auto response = client_.receive(timeout);
if (response.object == nullptr) {
return nullptr;
}
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, 0));
}
const char *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, 0));
}
static ClientManager *get_manager() {
return ClientManager::get_manager_singleton();
}
static std::mutex extra_mutex;
static FlatHashMap<int64, string> extra;
static std::atomic<uint64> extra_id{1};
int json_create_client_id() {
return static_cast<int>(get_manager()->create_client_id());
}
void json_send(int client_id, Slice request) {
auto parsed_request = to_request(request);
auto request_id = extra_id.fetch_add(1, std::memory_order_relaxed);
if (!parsed_request.second.empty()) {
std::lock_guard<std::mutex> guard(extra_mutex);
extra[request_id] = std::move(parsed_request.second);
}
get_manager()->send(client_id, request_id, std::move(parsed_request.first));
}
const char *json_receive(double timeout) {
auto response = get_manager()->receive(timeout);
if (!response.object) {
return nullptr;
}
string extra_str;
if (response.request_id != 0) {
std::lock_guard<std::mutex> guard(extra_mutex);
auto it = extra.find(response.request_id);
if (it != extra.end()) {
extra_str = std::move(it->second);
extra.erase(it);
}
}
return store_string(from_response(*response.object, extra_str, response.client_id));
}
const char *json_execute(Slice request) {
auto parsed_request = to_request(request);
return store_string(
from_response(*ClientManager::execute(std::move(parsed_request.first)), parsed_request.second, 0));
}
} // namespace td
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