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RocksDB for Erlang

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rocksdb c_src env.h
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c_src/env.h 

// Copyright (c) 2016-2026 Benoit Chesneau

//

// This file is provided to you under the Apache License,

// Version 2.0 (the "License"); you may not use this file

// except in compliance with the License.  You may obtain

// a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.



#pragma once

#ifndef INCL_ENV_H

#define INCL_ENV_H



#include <memory>



#include "erl_nif.h"



#include "rocksdb/env.h"

#include "rocksdb/env_encryption.h"





namespace erocksdb {



  class ManagedEnv {

    protected:

      static ErlNifResourceType* m_Env_RESOURCE;



    public:

      explicit ManagedEnv(rocksdb::Env * Env);



      // Wrapper env that owns its base env (e.g. memenv, encrypted env).

      // owns == true means the destructor will delete env_; the default env

      // singleton must NEVER be deleted, so it is created with owns == false.

      ManagedEnv(rocksdb::Env * Env, bool owns);



      ~ManagedEnv();



      const rocksdb::Env* env();



      // Keep the encryption provider and cipher alive for the lifetime of the

      // env. These are empty for non-encrypted envs.

      void SetEncryption(std::shared_ptr<rocksdb::EncryptionProvider> provider,

                         std::shared_ptr<rocksdb::BlockCipher> cipher);



      static void CreateEnvType(ErlNifEnv * Env);

      static void EnvResourceCleanup(ErlNifEnv *Env, void * Arg);



      static ManagedEnv * CreateEnvResource(rocksdb::Env * env);

      static ManagedEnv * CreateEnvResource(rocksdb::Env * env, bool owns);

      static ManagedEnv * RetrieveEnvResource(ErlNifEnv * Env, const ERL_NIF_TERM & EnvTerm);



    private:

      rocksdb::Env* env_;

      bool owns_env_;

      std::shared_ptr<rocksdb::EncryptionProvider> provider_;

      std::shared_ptr<rocksdb::BlockCipher> cipher_;

  };



}



#endif // INCL_ENV_H