tdlight/tddb/td/db/TQueue.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/actor/PromiseFuture.h"
#include "td/utils/common.h"
#include "td/utils/Slice.h"
#include "td/utils/Span.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include <map>
#include <memory>
#include <utility>
namespace td {
class TQueue {
public:
class EventId {
public:
static constexpr int32 MAX_ID = 2000000000;
EventId();
static Result<EventId> from_int32(int32 id);
bool is_valid() const;
int32 value() const;
Result<EventId> next() const;
Result<EventId> advance(size_t offset) const;
bool empty() const;
bool operator==(const EventId &other) const;
bool operator!=(const EventId &other) const;
bool operator<(const EventId &other) const;
private:
int32 id_{0};
explicit EventId(int32 id);
static bool is_valid_id(int32 id);
};
struct Event {
EventId id;
Slice data;
int64 extra{0};
double expires_at{0};
};
struct RawEvent {
uint64 logevent_id{0};
EventId event_id;
string data;
int64 extra{0};
double expires_at{0};
};
using QueueId = int64;
class StorageCallback {
public:
using QueueId = TQueue::QueueId;
using RawEvent = TQueue::RawEvent;
StorageCallback() = default;
StorageCallback(const StorageCallback &) = delete;
StorageCallback &operator=(const StorageCallback &) = delete;
StorageCallback(StorageCallback &&) = delete;
StorageCallback &operator=(StorageCallback &&) = delete;
virtual ~StorageCallback() = default;
virtual uint64 push(QueueId queue_id, const RawEvent &event) = 0;
virtual void pop(uint64 logevent_id) = 0;
virtual void close(Promise<> promise) = 0;
};
static unique_ptr<TQueue> create();
TQueue() = default;
TQueue(const TQueue &) = delete;
TQueue &operator=(const TQueue &) = delete;
TQueue(TQueue &&) = delete;
TQueue &operator=(TQueue &&) = delete;
virtual ~TQueue() = default;
virtual void set_callback(unique_ptr<StorageCallback> callback) = 0;
virtual unique_ptr<StorageCallback> extract_callback() = 0;
virtual bool do_push(QueueId queue_id, RawEvent &&raw_event) = 0;
virtual Result<EventId> push(QueueId queue_id, string data, double expires_at, int64 extra, EventId hint_new_id) = 0;
virtual void forget(QueueId queue_id, EventId event_id) = 0;
virtual EventId get_head(QueueId queue_id) const = 0;
virtual EventId get_tail(QueueId queue_id) const = 0;
virtual Result<size_t> get(QueueId queue_id, EventId from_id, bool forget_previous, double now,
MutableSpan<Event> &result_events) = 0;
virtual size_t get_size(QueueId queue_id) = 0;
virtual std::pair<uint64, uint64> run_gc(double now) = 0;
virtual void close(Promise<> promise) = 0;
};
StringBuilder &operator<<(StringBuilder &string_builder, const TQueue::EventId id);
struct BinlogEvent;
template <class BinlogT>
class TQueueBinlog : public TQueue::StorageCallback {
public:
TQueueBinlog();
uint64 push(QueueId queue_id, const RawEvent &event) override;
void pop(uint64 logevent_id) override;
Status replay(const BinlogEvent &binlog_event, TQueue &q) const TD_WARN_UNUSED_RESULT;
void set_binlog(std::shared_ptr<BinlogT> binlog) {
binlog_ = std::move(binlog);
}
virtual void close(Promise<> promise) override;
private:
std::shared_ptr<BinlogT> binlog_;
int32 magic_{2314};
double diff_{0};
};
class TQueueMemoryStorage : public TQueue::StorageCallback {
public:
uint64 push(QueueId queue_id, const RawEvent &event) override;
void pop(uint64 logevent_id) override;
void replay(TQueue &q) const;
virtual void close(Promise<> promise) override;
private:
uint64 next_logevent_id_{1};
std::map<uint64, std::pair<QueueId, RawEvent>> events_;
};
} // namespace td