//  Copyright (c) Meta Platforms, Inc. and affiliates.

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

#pragma once

#include <cinttypes>

#include "rocksdb/compression_type.h"

#include "rocksdb/slice.h"

#include "rocksdb/status.h"

#include "util/autovector.h"

namespace ROCKSDB_NAMESPACE {

// A read Blob request structure for use in BlobSource::MultiGetBlob and

// BlobFileReader::MultiGetBlob.

struct BlobReadRequest {

  // User key to lookup the paired blob

  const Slice* user_key = nullptr;

  // File offset in bytes

  uint64_t offset = 0;

  // Length to read in bytes

  size_t len = 0;

  // Blob compression type

  CompressionType compression = kNoCompression;

  // Output parameter set by MultiGetBlob() to point to the data buffer, and

  // the number of valid bytes

  PinnableSlice* result = nullptr;

  // Status of read

  Status* status = nullptr;

  BlobReadRequest(const Slice& _user_key, uint64_t _offset, size_t _len,

                  CompressionType _compression, PinnableSlice* _result,

                  Status* _status)

      : user_key(&_user_key),

        offset(_offset),

        len(_len),

        compression(_compression),

        result(_result),

        status(_status) {}

  BlobReadRequest() = default;

  BlobReadRequest(const BlobReadRequest& other) = default;

  BlobReadRequest& operator=(const BlobReadRequest& other) = default;

};

using BlobFileReadRequests =

    std::tuple<uint64_t /* file_number */, uint64_t /* file_size */,

               autovector<BlobReadRequest>>;

}  // namespace ROCKSDB_NAMESPACE