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RocksDB for Erlang

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rocksdb deps rocksdb utilities debug.cc
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deps/rocksdb/utilities/debug.cc 

//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.

//  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).



#ifndef ROCKSDB_LITE



#include "rocksdb/utilities/debug.h"



#include "db/db_impl.h"



namespace rocksdb {



Status GetAllKeyVersions(DB* db, Slice begin_key, Slice end_key,

                         size_t max_num_ikeys,

                         std::vector<KeyVersion>* key_versions) {

  assert(key_versions != nullptr);

  key_versions->clear();



  DBImpl* idb = static_cast<DBImpl*>(db->GetRootDB());

  auto icmp = InternalKeyComparator(idb->GetOptions().comparator);

  ReadRangeDelAggregator range_del_agg(&icmp,

                                       kMaxSequenceNumber /* upper_bound */);

  Arena arena;

  ScopedArenaIterator iter(

      idb->NewInternalIterator(&arena, &range_del_agg, kMaxSequenceNumber));



  if (!begin_key.empty()) {

    InternalKey ikey;

    ikey.SetMinPossibleForUserKey(begin_key);

    iter->Seek(ikey.Encode());

  } else {

    iter->SeekToFirst();

  }



  size_t num_keys = 0;

  for (; iter->Valid(); iter->Next()) {

    ParsedInternalKey ikey;

    if (!ParseInternalKey(iter->key(), &ikey)) {

      return Status::Corruption("Internal Key [" + iter->key().ToString() +

                                "] parse error!");

    }



    if (!end_key.empty() &&

        icmp.user_comparator()->Compare(ikey.user_key, end_key) > 0) {

      break;

    }



    key_versions->emplace_back(ikey.user_key.ToString() /* _user_key */,

                               iter->value().ToString() /* _value */,

                               ikey.sequence /* _sequence */,

                               static_cast<int>(ikey.type) /* _type */);

    if (++num_keys >= max_num_ikeys) {

      break;

    }

  }

  return Status::OK();

}



}  // namespace rocksdb



#endif  // ROCKSDB_LITE