tdlight/tddb/td/db/TQueue.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/db/TQueue.h"
#include "td/db/binlog/Binlog.h"
#include "td/db/binlog/BinlogEvent.h"
#include "td/db/binlog/BinlogHelper.h"
#include "td/db/binlog/BinlogInterface.h"
#include "td/utils/misc.h"
#include "td/utils/Random.h"
#include "td/utils/StorerBase.h"
#include "td/utils/tl_helpers.h"
#include "td/utils/tl_parsers.h"
#include "td/utils/tl_storers.h"
#include <set>
#include <unordered_map>
namespace td {
using EventId = TQueue::EventId;
EventId::EventId() {
}
Result<EventId> EventId::from_int32(int32 id) {
if (!is_valid_id(id)) {
return Status::Error("Invalid ID");
}
return EventId(id);
}
bool EventId::is_valid() const {
return !empty() && is_valid_id(id_);
}
int32 EventId::value() const {
return id_;
}
Result<EventId> EventId::next() const {
return from_int32(id_ + 1);
}
Result<EventId> EventId::advance(size_t offset) const {
TRY_RESULT(new_id, narrow_cast_safe<int32>(id_ + offset));
return from_int32(new_id);
}
bool EventId::empty() const {
return id_ == 0;
}
bool EventId::operator==(const EventId &other) const {
return id_ == other.id_;
}
bool EventId::operator!=(const EventId &other) const {
return !(*this == other);
}
bool EventId::operator<(const EventId &other) const {
return id_ < other.id_;
}
StringBuilder &operator<<(StringBuilder &string_builder, const EventId id) {
return string_builder << "EventId{" << id.value() << "}";
}
EventId::EventId(int32 id) : id_(id) {
CHECK(is_valid_id(id));
}
bool EventId::is_valid_id(int32 id) {
return 0 <= id && id < MAX_ID;
}
class TQueueImpl : public TQueue {
static constexpr size_t MAX_EVENT_LENGTH = 65536 * 8;
static constexpr size_t MAX_QUEUE_EVENTS = 1000000;
static constexpr size_t MAX_TOTAL_EVENT_LENGTH = 1 << 30;
public:
void set_callback(unique_ptr<StorageCallback> callback) override {
callback_ = std::move(callback);
}
unique_ptr<StorageCallback> extract_callback() override {
return std::move(callback_);
}
bool do_push(QueueId queue_id, RawEvent &&raw_event) override {
CHECK(raw_event.event_id.is_valid());
// raw_event.data can be empty when replaying binlog
if (raw_event.data.size() > MAX_EVENT_LENGTH) {
return false;
}
auto &q = queues_[queue_id];
if (q.events.size() >= MAX_QUEUE_EVENTS || q.total_event_length > MAX_TOTAL_EVENT_LENGTH - raw_event.data.size() ||
raw_event.expires_at <= 0) {
return false;
}
auto event_id = raw_event.event_id;
if (event_id < q.tail_id) {
return false;
}
if (!q.events.empty()) {
auto it = q.events.end();
--it;
if (it->second.data.empty()) {
if (callback_ != nullptr && it->second.log_event_id != 0) {
callback_->pop(it->second.log_event_id);
}
q.events.erase(it);
}
}
if (q.events.empty() && !raw_event.data.empty()) {
schedule_queue_gc(queue_id, q, raw_event.expires_at);
}
if (raw_event.log_event_id == 0 && callback_ != nullptr) {
raw_event.log_event_id = callback_->push(queue_id, raw_event);
}
q.tail_id = event_id.next().move_as_ok();
q.total_event_length += raw_event.data.size();
q.events.emplace(event_id, std::move(raw_event));
return true;
}
Result<EventId> push(QueueId queue_id, string data, int32 expires_at, int64 extra, EventId hint_new_id) override {
if (data.empty()) {
return Status::Error("Data is empty");
}
if (data.size() > MAX_EVENT_LENGTH) {
return Status::Error("Data is too big");
}
auto &q = queues_[queue_id];
if (q.events.size() >= MAX_QUEUE_EVENTS) {
return Status::Error("Queue is full");
}
if (q.total_event_length > MAX_TOTAL_EVENT_LENGTH - data.size()) {
return Status::Error("Queue size is too big");
}
if (expires_at <= 0) {
return Status::Error("Failed to add already expired event");
}
EventId event_id;
while (true) {
if (q.tail_id.empty()) {
if (hint_new_id.empty()) {
q.tail_id = EventId::from_int32(Random::fast(2 * MAX_QUEUE_EVENTS + 1, EventId::MAX_ID / 2)).move_as_ok();
} else {
q.tail_id = hint_new_id;
}
}
event_id = q.tail_id;
CHECK(event_id.is_valid());
if (event_id.next().is_ok()) {
break;
}
for (auto it = q.events.begin(); it != q.events.end();) {
pop(q, queue_id, it, {});
}
q.tail_id = EventId();
CHECK(hint_new_id.next().is_ok());
}
RawEvent raw_event;
raw_event.event_id = event_id;
raw_event.data = std::move(data);
raw_event.expires_at = expires_at;
raw_event.extra = extra;
bool is_added = do_push(queue_id, std::move(raw_event));
CHECK(is_added);
return event_id;
}
EventId get_head(QueueId queue_id) const override {
auto it = queues_.find(queue_id);
if (it == queues_.end()) {
return EventId();
}
return get_queue_head(it->second);
}
EventId get_tail(QueueId queue_id) const override {
auto it = queues_.find(queue_id);
if (it == queues_.end()) {
return EventId();
}
auto &q = it->second;
return q.tail_id;
}
void forget(QueueId queue_id, EventId event_id) override {
auto q_it = queues_.find(queue_id);
if (q_it == queues_.end()) {
return;
}
auto &q = q_it->second;
auto it = q.events.find(event_id);
if (it == q.events.end()) {
return;
}
pop(q, queue_id, it, q.tail_id);
}
Result<size_t> get(QueueId queue_id, EventId from_id, bool forget_previous, int32 unix_time_now,
MutableSpan<Event> &result_events) override {
auto it = queues_.find(queue_id);
if (it == queues_.end()) {
result_events.truncate(0);
return 0;
}
auto &q = it->second;
// Some sanity checks
if (from_id.value() > q.tail_id.value() + 10) {
return Status::Error("Specified from_id is in the future");
}
if (from_id.value() < get_queue_head(q).value() - static_cast<int32>(MAX_QUEUE_EVENTS)) {
return Status::Error("Specified from_id is in the past");
}
do_get(queue_id, q, from_id, forget_previous, unix_time_now, result_events);
return get_size(q);
}
int64 run_gc(int32 unix_time_now) override {
int64 deleted_events = 0;
while (!queue_gc_at_.empty()) {
auto it = queue_gc_at_.begin();
if (it->first >= unix_time_now) {
break;
}
auto queue_id = it->second;
auto &q = queues_[queue_id];
CHECK(q.gc_at == it->first);
int32 new_gc_at = 0;
if (!q.events.empty()) {
auto head_id = q.events.begin()->first;
Event event;
MutableSpan<Event> span{&event, 1};
size_t size_before = get_size(q);
do_get(queue_id, q, head_id, false, unix_time_now, span);
size_t size_after = get_size(q);
CHECK(size_after <= size_before);
deleted_events += size_before - size_after;
if (!span.empty()) {
CHECK(!event.data.empty());
new_gc_at = event.expires_at;
CHECK(new_gc_at >= unix_time_now);
}
}
schedule_queue_gc(queue_id, q, new_gc_at);
}
return deleted_events;
}
size_t get_size(QueueId queue_id) const override {
auto it = queues_.find(queue_id);
if (it == queues_.end()) {
return 0;
}
return get_size(it->second);
}
void close(Promise<> promise) override {
if (callback_ != nullptr) {
callback_->close(std::move(promise));
callback_ = nullptr;
}
}
private:
struct Queue {
EventId tail_id;
std::map<EventId, RawEvent> events;
size_t total_event_length = 0;
int32 gc_at = 0;
};
std::unordered_map<QueueId, Queue> queues_;
std::set<std::pair<int32, QueueId>> queue_gc_at_;
unique_ptr<StorageCallback> callback_;
static EventId get_queue_head(const Queue &q) {
if (q.events.empty()) {
return q.tail_id;
}
return q.events.begin()->first;
}
static size_t get_size(const Queue &q) {
if (q.events.empty()) {
return 0;
}
return q.events.size() - (q.events.rbegin()->second.data.empty() ? 1 : 0);
}
void pop(Queue &q, QueueId queue_id, std::map<EventId, RawEvent>::iterator &it, EventId tail_id) {
auto &event = it->second;
if (callback_ == nullptr || event.log_event_id == 0) {
remove_event(q, it);
return;
}
if (event.event_id.next().ok() == tail_id) {
if (!event.data.empty()) {
clear_event_data(q, event);
callback_->push(queue_id, event);
}
++it;
} else {
callback_->pop(event.log_event_id);
remove_event(q, it);
}
}
static void remove_event(Queue &q, std::map<EventId, RawEvent>::iterator &it) {
q.total_event_length -= it->second.data.size();
it = q.events.erase(it);
}
static void clear_event_data(Queue &q, RawEvent &event) {
q.total_event_length -= event.data.size();
event.data = {};
}
void do_get(QueueId queue_id, Queue &q, EventId from_id, bool forget_previous, int32 unix_time_now,
MutableSpan<Event> &result_events) {
if (forget_previous) {
for (auto it = q.events.begin(); it != q.events.end() && it->first < from_id;) {
pop(q, queue_id, it, q.tail_id);
}
}
size_t ready_n = 0;
for (auto it = q.events.lower_bound(from_id); it != q.events.end();) {
auto &event = it->second;
if (event.expires_at < unix_time_now || event.data.empty()) {
pop(q, queue_id, it, q.tail_id);
} else {
CHECK(!(event.event_id < from_id));
if (ready_n == result_events.size()) {
break;
}
auto &to = result_events[ready_n];
to.data = event.data;
to.id = event.event_id;
to.expires_at = event.expires_at;
to.extra = event.extra;
ready_n++;
++it;
}
}
result_events.truncate(ready_n);
}
void schedule_queue_gc(QueueId queue_id, Queue &q, int32 gc_at) {
if (q.gc_at != 0) {
bool is_deleted = queue_gc_at_.erase({q.gc_at, queue_id});
CHECK(is_deleted);
}
q.gc_at = gc_at;
if (q.gc_at != 0) {
bool is_inserted = queue_gc_at_.emplace(gc_at, queue_id).second;
CHECK(is_inserted);
}
}
};
unique_ptr<TQueue> TQueue::create() {
return make_unique<TQueueImpl>();
}
struct TQueueLogEvent : public Storer {
int64 queue_id;
int32 event_id;
int32 expires_at;
Slice data;
int64 extra;
template <class StorerT>
void store(StorerT &&storer) const {
using td::store;
store(queue_id, storer);
store(event_id, storer);
store(expires_at, storer);
store(data, storer);
if (extra != 0) {
store(extra, storer);
}
}
template <class ParserT>
void parse(ParserT &&parser, int32 has_extra) {
using td::parse;
parse(queue_id, parser);
parse(event_id, parser);
parse(expires_at, parser);
data = parser.template fetch_string<Slice>();
if (has_extra == 0) {
extra = 0;
} else {
parse(extra, parser);
}
}
size_t size() const override {
TlStorerCalcLength storer;
store(storer);
return storer.get_length();
}
size_t store(uint8 *ptr) const override {
TlStorerUnsafe storer(ptr);
store(storer);
return static_cast<size_t>(storer.get_buf() - ptr);
}
};
template <class BinlogT>
uint64 TQueueBinlog<BinlogT>::push(QueueId queue_id, const RawEvent &event) {
TQueueLogEvent log_event;
log_event.queue_id = queue_id;
log_event.event_id = event.event_id.value();
log_event.expires_at = event.expires_at;
log_event.data = event.data;
log_event.extra = event.extra;
auto magic = BINLOG_EVENT_TYPE + (log_event.extra != 0);
if (event.log_event_id == 0) {
return binlog_->add(magic, log_event);
}
binlog_->rewrite(event.log_event_id, magic, log_event);
return event.log_event_id;
}
template <class BinlogT>
void TQueueBinlog<BinlogT>::pop(uint64 log_event_id) {
binlog_->erase(log_event_id);
}
template <class BinlogT>
Status TQueueBinlog<BinlogT>::replay(const BinlogEvent &binlog_event, TQueue &q) const {
TQueueLogEvent event;
TlParser parser(binlog_event.data_);
int32 has_extra = binlog_event.type_ - BINLOG_EVENT_TYPE;
if (has_extra != 0 && has_extra != 1) {
return Status::Error("Wrong magic");
}
event.parse(parser, has_extra);
parser.fetch_end();
TRY_STATUS(parser.get_status());
TRY_RESULT(event_id, EventId::from_int32(event.event_id));
RawEvent raw_event;
raw_event.log_event_id = binlog_event.id_;
raw_event.event_id = event_id;
raw_event.expires_at = event.expires_at;
raw_event.data = event.data.str();
raw_event.extra = event.extra;
if (!q.do_push(event.queue_id, std::move(raw_event))) {
return Status::Error("Failed to add event");
}
return Status::OK();
}
template <class BinlogT>
void TQueueBinlog<BinlogT>::close(Promise<> promise) {
binlog_->close(std::move(promise));
}
template class TQueueBinlog<BinlogInterface>;
template class TQueueBinlog<Binlog>;
uint64 TQueueMemoryStorage::push(QueueId queue_id, const RawEvent &event) {
auto log_event_id = event.log_event_id == 0 ? next_log_event_id_++ : event.log_event_id;
events_[log_event_id] = std::make_pair(queue_id, event);
return log_event_id;
}
void TQueueMemoryStorage::pop(uint64 log_event_id) {
events_.erase(log_event_id);
}
void TQueueMemoryStorage::replay(TQueue &q) const {
for (auto &e : events_) {
auto x = e.second;
x.second.log_event_id = e.first;
bool is_added = q.do_push(x.first, std::move(x.second));
CHECK(is_added);
}
}
void TQueueMemoryStorage::close(Promise<> promise) {
events_.clear();
promise.set_value({});
}
} // namespace td