tdlight/td/telegram/net/NetQuery.h

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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)
//
#pragma once
#include "td/telegram/net/DcId.h"
#include "td/telegram/net/NetQueryCounter.h"
#include "td/telegram/net/NetQueryStats.h"
#include "td/actor/actor.h"
#include "td/actor/PromiseFuture.h"
#include "td/actor/SignalSlot.h"
#include "td/utils/buffer.h"
#include "td/utils/common.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/ObjectPool.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include "td/utils/Time.h"
#include "td/utils/tl_parsers.h"
#include "td/utils/TsList.h"
#include <atomic>
#include <utility>
namespace td {
class NetQuery;
using NetQueryPtr = ObjectPool<NetQuery>::OwnerPtr;
using NetQueryRef = ObjectPool<NetQuery>::WeakPtr;
class NetQueryCallback : public Actor {
public:
virtual void on_result(NetQueryPtr query);
virtual void on_result_resendable(NetQueryPtr query, Promise<NetQueryPtr> promise);
};
class NetQuery : public TsListNode<NetQueryDebug> {
public:
NetQuery() = default;
enum class State : int8 { Empty, Query, OK, Error };
enum class Type : int8 { Common, Upload, Download, DownloadSmall };
enum class AuthFlag : int8 { Off, On };
enum class GzipFlag : int8 { Off, On };
enum Error : int32 { Resend = 202, Cancelled = 203, ResendInvokeAfter = 204 };
uint64 id() const {
return id_;
}
DcId dc_id() const {
return dc_id_;
}
Type type() const {
return type_;
}
GzipFlag gzip_flag() const {
return gzip_flag_;
}
AuthFlag auth_flag() const {
return auth_flag_;
}
int32 tl_constructor() const {
return tl_constructor_;
}
void resend(DcId new_dc_id) {
VLOG(net_query) << "Resend" << *this;
{
auto guard = lock();
get_data_unsafe().resend_count_++;
}
dc_id_ = new_dc_id;
status_ = Status::OK();
state_ = State::Query;
}
void resend() {
resend(dc_id_);
}
BufferSlice &query() {
return query_;
}
BufferSlice &ok() {
CHECK(state_ == State::OK);
return answer_;
}
const BufferSlice &ok() const {
CHECK(state_ == State::OK);
return answer_;
}
Status &error() {
CHECK(state_ == State::Error);
return status_;
}
const Status &error() const {
CHECK(state_ == State::Error);
return status_;
}
BufferSlice move_as_ok() {
auto ok = std::move(answer_);
clear();
return ok;
}
Status move_as_error() TD_WARN_UNUSED_RESULT {
auto status = std::move(status_);
clear();
return status;
}
void set_ok(BufferSlice slice) {
VLOG(net_query) << "Got answer " << *this;
CHECK(state_ == State::Query);
answer_ = std::move(slice);
state_ = State::OK;
}
void on_net_write(size_t size);
void on_net_read(size_t size);
void set_error(Status status, string source = string());
void set_error_resend() {
set_error_impl(Status::Error<Error::Resend>());
}
void set_error_cancelled() {
set_error_impl(Status::Error<Error::Cancelled>());
}
void set_error_resend_invoke_after() {
set_error_impl(Status::Error<Error::ResendInvokeAfter>());
}
bool update_is_ready() {
if (state_ == State::Query) {
if (cancellation_token_.load(std::memory_order_relaxed) == 0 || cancel_slot_.was_signal()) {
set_error_cancelled();
return true;
}
return false;
}
return true;
}
bool is_ready() const {
return state_ != State::Query;
}
bool is_error() const {
return state_ == State::Error;
}
bool is_ok() const {
return state_ == State::OK;
}
int32 ok_tl_constructor() const {
return tl_magic(answer_);
}
void ignore() const {
status_.ignore();
}
uint64 session_id() const {
return session_id_.load(std::memory_order_relaxed);
}
void set_session_id(uint64 session_id) {
session_id_.store(session_id, std::memory_order_relaxed);
}
uint64 message_id() const {
return message_id_;
}
void set_message_id(uint64 message_id) {
message_id_ = message_id;
}
NetQueryRef invoke_after() const {
return invoke_after_;
}
void set_invoke_after(NetQueryRef ref) {
invoke_after_ = ref;
}
void set_session_rand(uint32 session_rand) {
session_rand_ = session_rand;
}
uint32 session_rand() const {
return session_rand_;
}
void cancel(int32 cancellation_token) {
cancellation_token_.compare_exchange_strong(cancellation_token, 0, std::memory_order_relaxed);
}
void set_cancellation_token(int32 cancellation_token) {
cancellation_token_.store(cancellation_token, std::memory_order_relaxed);
}
void clear() {
if (!is_ready()) {
auto guard = lock();
LOG(ERROR) << "Destroy not ready query " << *this << " " << tag("state", get_data_unsafe().state_);
}
// TODO: CHECK if net_query is lost here
cancel_slot_.close();
*this = NetQuery();
}
bool empty() const {
return state_ == State::Empty || !nq_counter_ || may_be_lost_;
}
void stop_track() {
nq_counter_ = NetQueryCounter();
remove();
}
void debug_send_failed() {
auto guard = lock();
get_data_unsafe().send_failed_count_++;
}
void debug(string state, bool may_be_lost = false) {
may_be_lost_ = may_be_lost;
VLOG(net_query) << *this << " " << tag("state", state);
{
auto guard = lock();
auto &data = get_data_unsafe();
data.state_ = std::move(state);
data.state_timestamp_ = Time::now();
data.state_change_count_++;
}
}
void set_callback(ActorShared<NetQueryCallback> callback) {
callback_ = std::move(callback);
}
ActorShared<NetQueryCallback> move_callback() {
return std::move(callback_);
}
void start_migrate(int32 sched_id) {
using ::td::start_migrate;
start_migrate(cancel_slot_, sched_id);
}
void finish_migrate() {
using ::td::finish_migrate;
finish_migrate(cancel_slot_);
}
private:
State state_ = State::Empty;
Type type_ = Type::Common;
AuthFlag auth_flag_ = AuthFlag::Off;
GzipFlag gzip_flag_ = GzipFlag::Off;
DcId dc_id_;
NetQueryCounter nq_counter_;
Status status_;
uint64 id_ = 0;
BufferSlice query_;
BufferSlice answer_;
int32 tl_constructor_ = 0;
NetQueryRef invoke_after_;
uint32 session_rand_ = 0;
bool may_be_lost_ = false;
template <class T>
struct movable_atomic : public std::atomic<T> {
movable_atomic() = default;
movable_atomic(T &&x) : std::atomic<T>(std::forward<T>(x)) {
}
movable_atomic(movable_atomic &&other) {
this->store(other.load(std::memory_order_relaxed), std::memory_order_relaxed);
}
movable_atomic &operator=(movable_atomic &&other) {
this->store(other.load(std::memory_order_relaxed), std::memory_order_relaxed);
return *this;
}
movable_atomic(const movable_atomic &other) = delete;
movable_atomic &operator=(const movable_atomic &other) = delete;
~movable_atomic() = default;
};
movable_atomic<uint64> session_id_{0};
uint64 message_id_{0};
movable_atomic<int32> cancellation_token_{-1}; // == 0 if query is canceled
ActorShared<NetQueryCallback> callback_;
void set_error_impl(Status status, string source = string()) {
VLOG(net_query) << "Got error " << *this << " " << status;
status_ = std::move(status);
state_ = State::Error;
source_ = std::move(source);
}
static int32 get_my_id();
static int32 tl_magic(const BufferSlice &buffer_slice);
public:
double next_timeout_ = 1; // for NetQueryDelayer
double total_timeout_ = 0; // for NetQueryDelayer/SequenceDispatcher
double total_timeout_limit_ = 60; // for NetQueryDelayer/SequenceDispatcher and to be set by caller
double last_timeout_ = 0; // for NetQueryDelayer/SequenceDispatcher
string source_; // for NetQueryDelayer/SequenceDispatcher
bool need_resend_on_503_ = true; // for NetQueryDispatcher and to be set by caller
int32 dispatch_ttl_ = -1; // for NetQueryDispatcher and to be set by caller
Slot cancel_slot_; // for Session and to be set by caller
Promise<> quick_ack_promise_; // for Session and to be set by caller
int32 file_type_ = -1; // to be set by caller
NetQuery(State state, uint64 id, BufferSlice &&query, BufferSlice &&answer, DcId dc_id, Type type, AuthFlag auth_flag,
GzipFlag gzip_flag, int32 tl_constructor, double total_timeout_limit, NetQueryStats *stats)
: state_(state)
, type_(type)
, auth_flag_(auth_flag)
, gzip_flag_(gzip_flag)
, dc_id_(dc_id)
, status_()
, id_(id)
, query_(std::move(query))
, answer_(std::move(answer))
, tl_constructor_(tl_constructor)
, total_timeout_limit_(total_timeout_limit) {
get_data_unsafe().my_id_ = get_my_id();
get_data_unsafe().start_timestamp_ = Time::now();
LOG(INFO) << *this;
if (stats) {
nq_counter_ = stats->register_query(this);
}
}
};
inline StringBuilder &operator<<(StringBuilder &stream, const NetQuery &net_query) {
stream << "[Query:";
stream << tag("id", net_query.id());
stream << tag("tl", format::as_hex(net_query.tl_constructor()));
if (!net_query.is_ready()) {
stream << tag("state", "Query");
} else if (net_query.is_error()) {
stream << tag("state", "Error");
stream << net_query.error();
} else if (net_query.is_ok()) {
stream << tag("state", "Result");
stream << tag("tl", format::as_hex(net_query.ok_tl_constructor()));
}
stream << "]";
return stream;
}
inline StringBuilder &operator<<(StringBuilder &stream, const NetQueryPtr &net_query_ptr) {
return stream << *net_query_ptr;
}
void dump_pending_network_queries();
inline void cancel_query(NetQueryRef &ref) {
if (ref.empty()) {
return;
}
ref->cancel(ref.generation());
}
template <class T>
Result<typename T::ReturnType> fetch_result(const BufferSlice &message) {
TlBufferParser parser(&message);
auto result = T::fetch_result(parser);
parser.fetch_end();
const char *error = parser.get_error();
if (error != nullptr) {
LOG(ERROR) << "Can't parse: " << format::as_hex_dump<4>(message.as_slice());
return Status::Error(500, Slice(error));
}
return std::move(result);
}
template <class T>
Result<typename T::ReturnType> fetch_result(NetQueryPtr query) {
CHECK(!query.empty());
if (query->is_error()) {
return query->move_as_error();
}
auto buffer = query->move_as_ok();
return fetch_result<T>(buffer);
}
template <class T>
Result<typename T::ReturnType> fetch_result(Result<NetQueryPtr> r_query) {
TRY_RESULT(query, std::move(r_query));
return fetch_result<T>(std::move(query));
}
inline void NetQueryCallback::on_result(NetQueryPtr query) {
on_result_resendable(std::move(query), Auto());
}
inline void NetQueryCallback::on_result_resendable(NetQueryPtr query, Promise<NetQueryPtr> promise) {
on_result(std::move(query));
}
inline void start_migrate(NetQueryPtr &net_query, int32 sched_id) {
net_query->start_migrate(sched_id);
}
inline void finish_migrate(NetQueryPtr &net_query) {
net_query->finish_migrate();
}
} // namespace td