File: lmdb.cc

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#include "lmdb.h" // NOLINT

#if defined(_MSC_VER)
#include <direct.h>
#endif

#include <sys/stat.h>

#include <string>

#include "caffe2/core/db.h"
#include "caffe2/core/logging.h"

namespace caffe2 {
namespace db {

constexpr size_t LMDB_MAP_SIZE = 1099511627776; // 1 TB

inline void MDB_CHECK(int mdb_status) {
  CAFFE_ENFORCE_EQ(mdb_status, MDB_SUCCESS, mdb_strerror(mdb_status));
}

class LMDBCursor : public Cursor {
 public:
  explicit LMDBCursor(MDB_env* mdb_env) : mdb_env_(mdb_env), valid_(false) {
    MDB_CHECK(mdb_txn_begin(mdb_env_, NULL, MDB_RDONLY, &mdb_txn_));
    MDB_CHECK(mdb_dbi_open(mdb_txn_, NULL, 0, &mdb_dbi_));
    MDB_CHECK(mdb_cursor_open(mdb_txn_, mdb_dbi_, &mdb_cursor_));
    SeekToFirst();
  }
  ~LMDBCursor() override {
    mdb_cursor_close(mdb_cursor_);
    mdb_dbi_close(mdb_env_, mdb_dbi_);
    mdb_txn_abort(mdb_txn_);
  }

  void Seek(const string& key) override {
    if (key.size() == 0) {
      SeekToFirst();
      return;
    }
    // a key of 16k size should be enough? I am not sure though.
    mdb_key_.mv_size = key.size();
    mdb_key_.mv_data = const_cast<char*>(key.c_str());
    int mdb_status =
        mdb_cursor_get(mdb_cursor_, &mdb_key_, &mdb_value_, MDB_SET_RANGE);
    if (mdb_status == MDB_NOTFOUND) {
      valid_ = false;
    } else {
      MDB_CHECK(mdb_status);
      valid_ = true;
    }
  }

  bool SupportsSeek() override {
    return true;
  }

  void SeekToFirst() override {
    SeekLMDB(MDB_FIRST);
  }

  void Next() override {
    SeekLMDB(MDB_NEXT);
  }

  string key() override {
    return string(static_cast<const char*>(mdb_key_.mv_data), mdb_key_.mv_size);
  }

  string value() override {
    return string(
        static_cast<const char*>(mdb_value_.mv_data), mdb_value_.mv_size);
  }

  bool Valid() override {
    return valid_;
  }

 private:
  void SeekLMDB(MDB_cursor_op op) {
    int mdb_status = mdb_cursor_get(mdb_cursor_, &mdb_key_, &mdb_value_, op);
    if (mdb_status == MDB_NOTFOUND) {
      valid_ = false;
    } else {
      MDB_CHECK(mdb_status);
      valid_ = true;
    }
  }

  MDB_env* mdb_env_;
  MDB_txn* mdb_txn_;
  MDB_dbi mdb_dbi_;
  MDB_cursor* mdb_cursor_;
  MDB_val mdb_key_, mdb_value_;
  bool valid_;
};

class LMDBTransaction final : public Transaction {
 public:
  explicit LMDBTransaction(MDB_env* mdb_env) : mdb_env_(mdb_env) {
    MDB_CHECK(mdb_txn_begin(mdb_env_, NULL, 0, &mdb_txn_));
    MDB_CHECK(mdb_dbi_open(mdb_txn_, NULL, 0, &mdb_dbi_));
  }
  ~LMDBTransaction() override {
    MDB_CHECK(mdb_txn_commit(mdb_txn_));
    mdb_dbi_close(mdb_env_, mdb_dbi_);
  }
  void Put(const string& key, string&& value) override;
  void Commit() override {
    MDB_CHECK(mdb_txn_commit(mdb_txn_));
    mdb_dbi_close(mdb_env_, mdb_dbi_);
    // Begin a new transaction.
    MDB_CHECK(mdb_txn_begin(mdb_env_, NULL, 0, &mdb_txn_));
    MDB_CHECK(mdb_dbi_open(mdb_txn_, NULL, 0, &mdb_dbi_));
  }

 private:
  MDB_env* mdb_env_;
  MDB_dbi mdb_dbi_;
  MDB_txn* mdb_txn_;

  C10_DISABLE_COPY_AND_ASSIGN(LMDBTransaction);
};

class LMDB : public DB {
 public:
  LMDB(const string& source, Mode mode);
  ~LMDB() override {
    Close();
  }
  void Close() override {
    if (mdb_env_ != NULL) {
      mdb_env_close(mdb_env_);
      mdb_env_ = NULL;
    }
  }
  unique_ptr<Cursor> NewCursor() override {
    return make_unique<LMDBCursor>(mdb_env_);
  }
  unique_ptr<Transaction> NewTransaction() override {
    return make_unique<LMDBTransaction>(mdb_env_);
  }

 private:
  MDB_env* mdb_env_;
};

LMDB::LMDB(const string& source, Mode mode) : DB(source, mode) {
  MDB_CHECK(mdb_env_create(&mdb_env_));
  MDB_CHECK(mdb_env_set_mapsize(mdb_env_, LMDB_MAP_SIZE));
  if (mode == NEW) {
#if defined(_MSC_VER)
    CAFFE_ENFORCE_EQ(_mkdir(source.c_str()), 0, "mkdir ", source, " failed");
#else
    CAFFE_ENFORCE_EQ(
        mkdir(source.c_str(), 0744), 0, "mkdir ", source, " failed");
#endif
  }
  int flags = 0;
  if (mode == READ) {
    flags = MDB_RDONLY | MDB_NOTLS | MDB_NOLOCK;
  }
  MDB_CHECK(mdb_env_open(mdb_env_, source.c_str(), flags, 0664));
  VLOG(1) << "Opened lmdb " << source;
}

void LMDBTransaction::Put(const string& key, string&& value) {
  MDB_val mdb_key, mdb_value;
  mdb_key.mv_data = const_cast<char*>(key.data());
  mdb_key.mv_size = key.size();
  mdb_value.mv_data = const_cast<char*>(value.data());
  mdb_value.mv_size = value.size();
  MDB_CHECK(mdb_put(mdb_txn_, mdb_dbi_, &mdb_key, &mdb_value, 0));
}

REGISTER_CAFFE2_DB(LMDB, LMDB);
REGISTER_CAFFE2_DB(lmdb, LMDB);

} // namespace db
} // namespace caffe2