tdlight/tddb/td/db/TQueue.cpp
levlam 060c01ace3 Minor improvements.
GitOrigin-RevId: b4e5073248377d84cb8acdf4a032970ec5cf5df9
2020-07-14 20:54:38 +03:00

475 lines
13 KiB
C++

//
// 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/port/Clocks.h"
#include "td/utils/Random.h"
#include "td/utils/StorerBase.h"
#include "td/utils/Time.h"
#include "td/utils/tl_helpers.h"
#include "td/utils/tl_parsers.h"
#include "td/utils/tl_storers.h"
#include "td/utils/VectorQueue.h"
#include <algorithm>
#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());
auto &q = queues_[queue_id];
if (q.events.empty() || q.events.back().event_id < raw_event.event_id) {
if (raw_event.logevent_id == 0 && callback_ != nullptr) {
raw_event.logevent_id = callback_->push(queue_id, raw_event);
}
q.tail_id = raw_event.event_id.next().move_as_ok();
q.total_event_length += raw_event.data.size();
q.events.push(std::move(raw_event));
return true;
}
return false;
}
Result<EventId> push(QueueId queue_id, string data, double expires_at, int64 extra, EventId hint_new_id) override {
auto &q = queues_[queue_id];
if (q.events.size() >= MAX_QUEUE_EVENTS) {
return Status::Error("Queue is full");
}
if (data.empty()) {
return Status::Error("Data is empty");
}
if (data.size() > MAX_EVENT_LENGTH) {
return Status::Error("Data is too big");
}
if (q.total_event_length > MAX_TOTAL_EVENT_LENGTH - data.size()) {
return Status::Error("Queue size is too big");
}
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 &event : q.events.as_mutable_span()) {
pop(q, queue_id, event, {});
}
q.tail_id = EventId();
q.events = {};
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();
}
auto &q = it->second;
if (q.events.empty()) {
return q.tail_id;
}
return q.events.front().event_id;
}
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 from_events = q.events.as_mutable_span();
auto it = std::lower_bound(from_events.begin(), from_events.end(), event_id,
[](auto &event, EventId event_id) { return event.event_id < event_id; });
if (it == from_events.end() || !(it->event_id == event_id)) {
return;
}
pop(q, queue_id, *it, q.tail_id);
}
Result<size_t> get(QueueId queue_id, EventId from_id, bool forget_previous, double 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() < q.tail_id.value() - static_cast<int32>(MAX_QUEUE_EVENTS) * 2) {
return Status::Error("Specified from_id is in the past");
}
return do_get(queue_id, q, from_id, forget_previous, now, result_events);
}
void run_gc(double now) override {
for (auto &it : queues_) {
for (auto &e : it.second.events.as_mutable_span()) {
try_pop(it.second, it.first, e, EventId(), now);
}
}
}
size_t get_size(QueueId queue_id) override {
auto it = queues_.find(queue_id);
if (it == queues_.end()) {
return 0;
}
auto &q = it->second;
if (q.events.empty()) {
return 0;
}
MutableSpan<Event> span;
return do_get(queue_id, q, q.events.front().event_id, true, Time::now(), span);
}
void close(Promise<> promise) override {
callback_->close(std::move(promise));
callback_ = nullptr;
}
private:
struct Queue {
EventId tail_id;
VectorQueue<RawEvent> events;
size_t total_event_length = 0;
};
std::unordered_map<QueueId, Queue> queues_;
unique_ptr<StorageCallback> callback_;
static void compactify(VectorQueue<RawEvent> &events, size_t prefix) {
if (prefix == events.size()) {
CHECK(!events.empty());
prefix--;
}
auto processed = events.as_mutable_span().substr(0, prefix);
auto removed_n =
processed.rend() - std::remove_if(processed.rbegin(), processed.rend(), [](auto &e) { return e.data.empty(); });
events.pop_n(removed_n);
}
void try_pop(Queue &q, QueueId queue_id, RawEvent &event, EventId from_id, double now) {
if (event.expires_at < now || event.event_id < from_id || event.data.empty()) {
pop(q, queue_id, event, q.tail_id);
}
}
void pop(Queue &q, QueueId queue_id, RawEvent &event, EventId tail_id) {
if (callback_ == nullptr || event.logevent_id == 0) {
event.logevent_id = 0;
clear_event_data(q, event);
return;
}
if (event.event_id.next().ok() == tail_id) {
if (!event.data.empty()) {
clear_event_data(q, event);
callback_->push(queue_id, event);
}
} else {
callback_->pop(event.logevent_id);
event.logevent_id = 0;
clear_event_data(q, event);
}
}
static void clear_event_data(Queue &q, RawEvent &event) {
q.total_event_length -= event.data.size();
event.data = {};
}
size_t do_get(QueueId queue_id, Queue &q, EventId from_id, bool forget_previous, double now,
MutableSpan<Event> &result_events) {
MutableSpan<RawEvent> from_events;
size_t ready_n = 0;
size_t i = 0;
while (true) {
from_events = q.events.as_mutable_span();
ready_n = 0;
size_t first_i = 0;
if (!forget_previous) {
first_i = std::lower_bound(from_events.begin(), from_events.end(), from_id,
[](auto &event, EventId event_id) { return event.event_id < event_id; }) -
from_events.begin();
}
for (i = first_i; i < from_events.size(); i++) {
auto &from = from_events[i];
try_pop(q, queue_id, from, forget_previous ? from_id : EventId{}, now);
if (from.data.empty()) {
continue;
}
if (ready_n == result_events.size()) {
break;
}
CHECK(!(from.event_id < from_id));
auto &to = result_events[ready_n];
to.data = from.data;
to.id = from.event_id;
to.expires_at = from.expires_at;
to.extra = from.extra;
ready_n++;
}
// compactify skipped events
if ((ready_n + 1) * 2 < i + first_i) {
compactify(q.events, i);
continue;
}
break;
}
result_events.truncate(ready_n);
size_t left_n = from_events.size() - i;
return ready_n + left_n;
}
};
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>
TQueueBinlog<BinlogT>::TQueueBinlog() {
diff_ = Clocks::system() - Time::now();
}
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 = static_cast<int32>(event.expires_at + diff_ + 1);
log_event.data = event.data;
log_event.extra = event.extra;
auto magic = magic_ + (log_event.extra != 0);
if (event.logevent_id == 0) {
return binlog_->add(magic, log_event);
}
binlog_->rewrite(event.logevent_id, magic, log_event);
return event.logevent_id;
}
template <class BinlogT>
void TQueueBinlog<BinlogT>::pop(uint64 logevent_id) {
binlog_->erase(logevent_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_ - magic_;
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.logevent_id = binlog_event.id_;
raw_event.event_id = event_id;
raw_event.expires_at = event.expires_at - diff_;
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 logevent_id = event.logevent_id == 0 ? next_logevent_id_++ : event.logevent_id;
events_[logevent_id] = std::make_pair(queue_id, event);
return logevent_id;
}
void TQueueMemoryStorage::pop(uint64 logevent_id) {
events_.erase(logevent_id);
}
void TQueueMemoryStorage::replay(TQueue &q) const {
for (auto &e : events_) {
auto x = e.second;
x.second.logevent_id = e.first;
bool is_added = q.do_push(x.first, std::move(x.second));
CHECK(is_added);
}
}
void TQueueMemoryStorage::close(Promise<> promise) {
promise.set_value({});
}
} // namespace td