151 lines
3.7 KiB
C++
151 lines
3.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Span.h"
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#include "td/utils/Status.h"
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#include "td/utils/StringBuilder.h"
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#include <map>
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#include <memory>
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#include <utility>
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namespace td {
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class TQueue {
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public:
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class EventId {
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public:
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static constexpr int32 MAX_ID = 2000000000;
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EventId();
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static Result<EventId> from_int32(int32 id);
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bool is_valid() const;
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int32 value() const;
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Result<EventId> next() const;
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Result<EventId> advance(size_t offset) const;
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bool empty() const;
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bool operator==(const EventId &other) const;
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bool operator!=(const EventId &other) const;
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bool operator<(const EventId &other) const;
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private:
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int32 id_{0};
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explicit EventId(int32 id);
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static bool is_valid_id(int32 id);
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};
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struct Event {
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EventId id;
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Slice data;
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int64 extra{0};
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double expires_at{0};
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};
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struct RawEvent {
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uint64 logevent_id{0};
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EventId event_id;
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string data;
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int64 extra{0};
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double expires_at{0};
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};
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using QueueId = int64;
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class StorageCallback {
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public:
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using QueueId = TQueue::QueueId;
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using RawEvent = TQueue::RawEvent;
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StorageCallback() = default;
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StorageCallback(const StorageCallback &) = delete;
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StorageCallback &operator=(const StorageCallback &) = delete;
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StorageCallback(StorageCallback &&) = delete;
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StorageCallback &operator=(StorageCallback &&) = delete;
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virtual ~StorageCallback() = default;
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virtual uint64 push(QueueId queue_id, const RawEvent &event) = 0;
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virtual void pop(uint64 logevent_id) = 0;
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};
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static unique_ptr<TQueue> create();
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TQueue() = default;
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TQueue(const TQueue &) = delete;
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TQueue &operator=(const TQueue &) = delete;
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TQueue(TQueue &&) = delete;
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TQueue &operator=(TQueue &&) = delete;
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virtual ~TQueue() = default;
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virtual void set_callback(unique_ptr<StorageCallback> callback) = 0;
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virtual unique_ptr<StorageCallback> extract_callback() = 0;
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virtual bool do_push(QueueId queue_id, RawEvent &&raw_event) = 0;
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virtual Result<EventId> push(QueueId queue_id, string data, double expires_at, int64 extra, EventId hint_new_id) = 0;
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virtual void forget(QueueId queue_id, EventId event_id) = 0;
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virtual EventId get_head(QueueId queue_id) const = 0;
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virtual EventId get_tail(QueueId queue_id) const = 0;
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virtual Result<size_t> get(QueueId queue_id, EventId from_id, bool forget_previous, double now,
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MutableSpan<Event> &result_events) = 0;
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virtual size_t get_size(QueueId queue_id) = 0;
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virtual void run_gc(double now) = 0;
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};
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StringBuilder &operator<<(StringBuilder &string_builder, const TQueue::EventId id);
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struct BinlogEvent;
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template <class BinlogT>
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class TQueueBinlog : public TQueue::StorageCallback {
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public:
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TQueueBinlog();
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uint64 push(QueueId queue_id, const RawEvent &event) override;
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void pop(uint64 logevent_id) override;
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Status replay(const BinlogEvent &binlog_event, TQueue &q) const;
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void set_binlog(std::shared_ptr<BinlogT> binlog) {
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binlog_ = std::move(binlog);
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}
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private:
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std::shared_ptr<BinlogT> binlog_;
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int32 magic_{2314};
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double diff_{0};
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};
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class TQueueMemoryStorage : public TQueue::StorageCallback {
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public:
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uint64 push(QueueId queue_id, const RawEvent &event) override;
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void pop(uint64 logevent_id) override;
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void replay(TQueue &q) const;
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private:
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uint64 next_logevent_id_{1};
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std::map<uint64, std::pair<QueueId, RawEvent>> events_;
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};
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} // namespace td
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