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tdlight/td/telegram/SequenceDispatcher.cpp

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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/SequenceDispatcher.h"
#include "td/telegram/Global.h"
#include "td/telegram/net/NetQueryDispatcher.h"
#include "td/telegram/Td.h"
#include "td/actor/PromiseFuture.h"
#include "td/utils/algorithm.h"
#include "td/utils/ChainScheduler.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Promise.h"
#include "td/utils/SliceBuilder.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include <limits>
namespace td {
/*** Sequence Dispatcher ***/
// Sends queries with invokeAfter.
//
// Each query has three states Start/Wait/Finish
//
// finish_i points to the first not Finish query.
// next_i points to the next query to be sent.
//
// Each query has generation of InvokeAfter chain.
//
// When query is send, its generation is set to current chain generation.
//
// When query is failed and its generation is equals to current generation we must start new chain:
// increment the generation and set next_i to finish_i.
//
// last_sent_i points to the last sent query in current chain.
//
void SequenceDispatcher::send_with_callback(NetQueryPtr query, ActorShared<NetQueryCallback> callback) {
cancel_timeout();
query->debug("Waiting at SequenceDispatcher");
auto query_weak_ref = query.get_weak();
data_.push_back(Data{State::Start, std::move(query_weak_ref), std::move(query), std::move(callback), 0, 0, 0});
loop();
}
void SequenceDispatcher::check_timeout(Data &data) {
if (data.state_ != State::Start) {
return;
}
data.query_->total_timeout_ += data.total_timeout_;
data.total_timeout_ = 0;
if (data.query_->total_timeout_ > data.query_->total_timeout_limit_) {
LOG(WARNING) << "Fail " << data.query_ << " to " << data.query_->source_ << " because total_timeout "
<< data.query_->total_timeout_ << " is greater than total_timeout_limit "
<< data.query_->total_timeout_limit_;
data.query_->set_error(Status::Error(429, PSLICE() << "Too Many Requests: retry after " << data.last_timeout_));
data.state_ = State::Dummy;
try_resend_query(data, std::move(data.query_));
}
}
void SequenceDispatcher::try_resend_query(Data &data, NetQueryPtr query) {
size_t pos = &data - &data_[0];
CHECK(pos < data_.size());
CHECK(data.state_ == State::Dummy);
data.state_ = State::Wait;
wait_cnt_++;
auto token = pos + id_offset_;
// TODO: if query is ok, use NetQueryCallback::on_result
if (data.callback_.empty()) {
do_finish(data);
send_closure_later(G()->td(), &Td::on_result, std::move(query));
loop();
return;
}
auto promise = PromiseCreator::lambda([&, self = actor_shared(this, token)](NetQueryPtr query) mutable {
if (!query.empty()) {
send_closure(std::move(self), &SequenceDispatcher::on_resend_ok, std::move(query));
} else {
send_closure(std::move(self), &SequenceDispatcher::on_resend_error);
}
});
send_closure(data.callback_, &NetQueryCallback::on_result_resendable, std::move(query), std::move(promise));
}
SequenceDispatcher::Data &SequenceDispatcher::data_from_token() {
auto token = narrow_cast<size_t>(get_link_token());
auto pos = token - id_offset_;
CHECK(pos < data_.size());
auto &data = data_[pos];
CHECK(data.state_ == State::Wait);
CHECK(wait_cnt_ > 0);
wait_cnt_--;
data.state_ = State::Dummy;
return data;
}
void SequenceDispatcher::on_resend_ok(NetQueryPtr query) {
auto &data = data_from_token();
data.query_ = std::move(query);
do_resend(data);
loop();
}
void SequenceDispatcher::on_resend_error() {
auto &data = data_from_token();
do_finish(data);
loop();
}
void SequenceDispatcher::do_resend(Data &data) {
CHECK(data.state_ == State::Dummy);
data.state_ = State::Start;
if (data.generation_ == generation_) {
next_i_ = finish_i_;
generation_++;
last_sent_i_ = std::numeric_limits<size_t>::max();
}
check_timeout(data);
}
void SequenceDispatcher::do_finish(Data &data) {
CHECK(data.state_ == State::Dummy);
data.state_ = State::Finish;
if (!parent_.empty()) {
send_closure(parent_, &Parent::on_result);
}
}
void SequenceDispatcher::on_result(NetQueryPtr query) {
auto &data = data_from_token();
size_t pos = &data - &data_[0];
CHECK(pos < data_.size());
if (query->last_timeout_ != 0) {
for (auto i = pos + 1; i < data_.size(); i++) {
data_[i].total_timeout_ += query->last_timeout_;
data_[i].last_timeout_ = query->last_timeout_;
check_timeout(data_[i]);
}
query->last_timeout_ = 0;
}
if (query->is_error() && (query->error().code() == NetQuery::ResendInvokeAfter ||
(query->error().code() == 400 && (query->error().message() == "MSG_WAIT_FAILED" ||
query->error().message() == "MSG_WAIT_TIMEOUT")))) {
VLOG(net_query) << "Resend " << query;
query->resend();
query->debug("Waiting at SequenceDispatcher");
data.query_ = std::move(query);
do_resend(data);
} else {
try_resend_query(data, std::move(query));
}
loop();
}
void SequenceDispatcher::loop() {
for (; finish_i_ < data_.size() && data_[finish_i_].state_ == State::Finish; finish_i_++) {
}
if (next_i_ < finish_i_) {
next_i_ = finish_i_;
}
for (; next_i_ < data_.size() && data_[next_i_].state_ != State::Wait && wait_cnt_ < MAX_SIMULTANEOUS_WAIT;
next_i_++) {
if (data_[next_i_].state_ == State::Finish) {
continue;
}
NetQueryRef invoke_after;
if (last_sent_i_ != std::numeric_limits<size_t>::max() && data_[last_sent_i_].state_ == State::Wait) {
invoke_after = data_[last_sent_i_].net_query_ref_;
}
if (!invoke_after.empty()) {
data_[next_i_].query_->set_invoke_after({invoke_after});
} else {
data_[next_i_].query_->set_invoke_after({});
}
data_[next_i_].query_->last_timeout_ = 0;
VLOG(net_query) << "Send " << data_[next_i_].query_;
data_[next_i_].query_->debug("send to Td::send_with_callback");
G()->net_query_dispatcher().dispatch_with_callback(std::move(data_[next_i_].query_),
actor_shared(this, next_i_ + id_offset_));
data_[next_i_].state_ = State::Wait;
wait_cnt_++;
data_[next_i_].generation_ = generation_;
last_sent_i_ = next_i_;
}
try_shrink();
if (finish_i_ == data_.size() && !parent_.empty()) {
set_timeout_in(5);
}
}
void SequenceDispatcher::try_shrink() {
if (finish_i_ * 2 > data_.size() && data_.size() > 5) {
CHECK(finish_i_ <= next_i_);
data_.erase(data_.begin(), data_.begin() + finish_i_);
next_i_ -= finish_i_;
if (last_sent_i_ != std::numeric_limits<size_t>::max()) {
if (last_sent_i_ >= finish_i_) {
last_sent_i_ -= finish_i_;
} else {
last_sent_i_ = std::numeric_limits<size_t>::max();
}
}
id_offset_ += finish_i_;
finish_i_ = 0;
}
}
void SequenceDispatcher::timeout_expired() {
if (finish_i_ != data_.size()) {
return;
}
CHECK(!parent_.empty());
set_timeout_in(1);
LOG(DEBUG) << "SequenceDispatcher ready to close";
send_closure(parent_, &Parent::ready_to_close);
}
void SequenceDispatcher::hangup() {
stop();
}
void SequenceDispatcher::tear_down() {
for (auto &data : data_) {
if (data.query_.empty()) {
continue;
}
data.state_ = State::Dummy;
data.query_->set_error(Global::request_aborted_error());
do_finish(data);
}
}
void SequenceDispatcher::close_silent() {
for (auto &data : data_) {
if (!data.query_.empty()) {
data.query_->clear();
}
}
stop();
}
void MultiSequenceDispatcherOld::send(NetQueryPtr query) {
auto callback = query->move_callback();
auto chain_ids = query->get_chain_ids();
query->set_in_sequence_dispatcher(true);
CHECK(all_of(chain_ids, [](auto chain_id) { return chain_id != 0; }));
CHECK(!chain_ids.empty());
auto sequence_id = chain_ids[0];
auto it_ok = dispatchers_.emplace(sequence_id, Data{0, ActorOwn<SequenceDispatcher>()});
auto &data = it_ok.first->second;
if (it_ok.second) {
LOG(DEBUG) << "Create SequenceDispatcher" << sequence_id;
data.dispatcher_ = create_actor<SequenceDispatcher>("SequenceDispatcher", actor_shared(this, sequence_id));
}
data.cnt_++;
query->debug(PSTRING() << "send to SequenceDispatcher " << tag("sequence_id", sequence_id));
send_closure(data.dispatcher_, &SequenceDispatcher::send_with_callback, std::move(query), std::move(callback));
}
void MultiSequenceDispatcherOld::on_result() {
auto it = dispatchers_.find(get_link_token());
CHECK(it != dispatchers_.end());
it->second.cnt_--;
}
void MultiSequenceDispatcherOld::ready_to_close() {
auto it = dispatchers_.find(get_link_token());
CHECK(it != dispatchers_.end());
if (it->second.cnt_ == 0) {
LOG(DEBUG) << "Close SequenceDispatcher " << get_link_token();
dispatchers_.erase(it);
}
}
class MultiSequenceDispatcherImpl final : public MultiSequenceDispatcher {
public:
void send(NetQueryPtr query) final {
auto callback = query->move_callback();
auto chain_ids = query->get_chain_ids();
query->set_in_sequence_dispatcher(true);
CHECK(all_of(chain_ids, [](auto chain_id) { return chain_id != 0; }));
Node node;
node.net_query = std::move(query);
node.net_query->debug("Waiting at SequenceDispatcher");
node.net_query_ref = node.net_query.get_weak();
node.callback = std::move(callback);
scheduler_.create_task(chain_ids, std::move(node));
loop();
}
private:
struct Node {
NetQueryRef net_query_ref;
NetQueryPtr net_query;
int32 total_timeout{0};
int32 last_timeout{0};
ActorShared<NetQueryCallback> callback;
friend StringBuilder &operator<<(StringBuilder &sb, const Node &node) {
return sb << node.net_query;
}
};
ChainScheduler<Node> scheduler_;
using TaskId = ChainScheduler<Node>::TaskId;
bool check_timeout(Node &node) {
auto &net_query = node.net_query;
if (net_query.empty() || net_query->is_ready()) {
return false;
}
if (node.total_timeout > 0) {
net_query->total_timeout_ += node.total_timeout;
LOG(INFO) << "Set total_timeout to " << net_query->total_timeout_ << " for " << net_query->id();
node.total_timeout = 0;
if (net_query->total_timeout_ > net_query->total_timeout_limit_) {
LOG(WARNING) << "Fail " << net_query << " to " << net_query->source_ << " because total_timeout "
<< net_query->total_timeout_ << " is greater than total_timeout_limit "
<< net_query->total_timeout_limit_;
net_query->set_error(Status::Error(429, PSLICE() << "Too Many Requests: retry after " << node.last_timeout));
return true;
}
}
return false;
}
void on_result(NetQueryPtr query) final {
auto task_id = TaskId(get_link_token());
auto &node = *scheduler_.get_task_extra(task_id);
if (query->last_timeout_ != 0) {
vector<TaskId> to_check_timeout;
auto tl_constructor = query->tl_constructor();
scheduler_.for_each_dependent(task_id, [&](TaskId child_task_id) {
auto &child_node = *scheduler_.get_task_extra(child_task_id);
if (child_node.net_query_ref->tl_constructor() == tl_constructor && child_task_id != task_id) {
child_node.total_timeout += query->last_timeout_;
child_node.last_timeout = query->last_timeout_;
to_check_timeout.push_back(child_task_id);
}
});
query->last_timeout_ = 0;
for (auto dependent_task_id : to_check_timeout) {
auto &child_node = *scheduler_.get_task_extra(dependent_task_id);
if (check_timeout(child_node)) {
scheduler_.pause_task(dependent_task_id);
try_resend(dependent_task_id);
}
}
}
if (query->is_error() && (query->error().code() == NetQuery::ResendInvokeAfter ||
(query->error().code() == 400 && (query->error().message() == "MSG_WAIT_FAILED" ||
query->error().message() == "MSG_WAIT_TIMEOUT")))) {
VLOG(net_query) << "Resend " << query;
query->resend();
do_resend(task_id, node, std::move(query));
loop();
return;
}
node.net_query = std::move(query);
try_resend(task_id);
}
void try_resend(TaskId task_id) {
auto &node = *scheduler_.get_task_extra(task_id);
if (node.callback.empty()) {
auto query = std::move(node.net_query);
scheduler_.finish_task(task_id);
send_closure_later(G()->td(), &Td::on_result, std::move(query));
loop();
return;
}
auto promise = promise_send_closure(actor_shared(this, task_id), &MultiSequenceDispatcherImpl::on_resend);
send_closure(node.callback, &NetQueryCallback::on_result_resendable, std::move(node.net_query), std::move(promise));
}
void on_resend(Result<NetQueryPtr> r_query) {
auto task_id = TaskId(get_link_token());
auto &node = *scheduler_.get_task_extra(task_id);
if (r_query.is_error()) {
scheduler_.finish_task(task_id);
} else {
do_resend(task_id, node, r_query.move_as_ok());
}
loop();
}
void do_resend(TaskId task_id, Node &node, NetQueryPtr &&query) {
node.net_query = std::move(query);
node.net_query->debug("Waiting at SequenceDispatcher");
node.net_query_ref = node.net_query.get_weak();
if (check_timeout(node)) {
scheduler_.pause_task(task_id);
try_resend(task_id);
} else {
scheduler_.reset_task(task_id);
}
}
void loop() final {
flush_pending_queries();
}
void tear_down() final {
// Leaves scheduler_ in an invalid state, but we are closing anyway
scheduler_.for_each([](Node &node) {
if (node.net_query.empty()) {
return;
}
node.net_query->set_error(Global::request_aborted_error());
});
}
void flush_pending_queries() {
while (true) {
auto o_task = scheduler_.start_next_task();
if (!o_task) {
break;
}
auto task = o_task.unwrap();
auto &node = *scheduler_.get_task_extra(task.task_id);
CHECK(!node.net_query.empty());
auto query = std::move(node.net_query);
vector<NetQueryRef> parents;
for (auto parent_id : task.parents) {
auto &parent_node = *scheduler_.get_task_extra(parent_id);
parents.push_back(parent_node.net_query_ref);
CHECK(!parent_node.net_query_ref.empty());
}
query->set_invoke_after(std::move(parents));
query->last_timeout_ = 0;
query->debug("dispatch_with_callback");
G()->net_query_dispatcher().dispatch_with_callback(std::move(query), actor_shared(this, task.task_id));
}
}
};
ActorOwn<MultiSequenceDispatcher> MultiSequenceDispatcher::create(Slice name) {
return ActorOwn<MultiSequenceDispatcher>(create_actor<MultiSequenceDispatcherImpl>(name));
}
} // namespace td
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