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src/subversion/subversion/libsvn_fs_base/bdb/txn-table.c  view on Meta::CPAN

  if (is_committed(txn))
    return svn_fs_base__err_txn_not_mutable(fs, txn_name);

  /* Delete the transaction from the `transactions' table. */
  svn_fs_base__str_to_dbt(&key, txn_name);
  svn_fs_base__trail_debug(trail, "transactions", "del");
  return BDB_WRAP(fs, N_("deleting entry from 'transactions' table"),
                  bfd->transactions->del(bfd->transactions,
                                         trail->db_txn, &key, 0));
}


svn_error_t *
svn_fs_bdb__get_txn(transaction_t **txn_p,
                    svn_fs_t *fs,
                    const char *txn_name,
                    trail_t *trail,
                    apr_pool_t *pool)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBT key, value;
  int db_err;
  svn_skel_t *skel;
  transaction_t *transaction;

  /* Only in the context of this function do we know that the DB call
     will not attempt to modify txn_name, so the cast belongs here.  */
  svn_fs_base__trail_debug(trail, "transactions", "get");
  db_err = bfd->transactions->get(bfd->transactions, trail->db_txn,
                                  svn_fs_base__str_to_dbt(&key, txn_name),
                                  svn_fs_base__result_dbt(&value),
                                  0);
  svn_fs_base__track_dbt(&value, pool);

  if (db_err == DB_NOTFOUND)
    return svn_fs_base__err_no_such_txn(fs, txn_name);
  SVN_ERR(BDB_WRAP(fs, N_("reading transaction"), db_err));

  /* Parse TRANSACTION skel */
  skel = svn_skel__parse(value.data, value.size, pool);
  if (! skel)
    return svn_fs_base__err_corrupt_txn(fs, txn_name);

  /* Convert skel to native type. */
  SVN_ERR(svn_fs_base__parse_transaction_skel(&transaction, skel, pool));
  *txn_p = transaction;
  return SVN_NO_ERROR;
}


svn_error_t *
svn_fs_bdb__get_txn_list(apr_array_header_t **names_p,
                         svn_fs_t *fs,
                         trail_t *trail,
                         apr_pool_t *pool)
{
  base_fs_data_t *bfd = fs->fsap_data;
  apr_size_t const next_key_key_len = strlen(NEXT_KEY_KEY);
  apr_pool_t *subpool = svn_pool_create(pool);
  apr_array_header_t *names;
  DBC *cursor;
  DBT key, value;
  int db_err, db_c_err;

  /* Allocate the initial names array */
  names = apr_array_make(pool, 4, sizeof(const char *));

  /* Create a database cursor to list the transaction names. */
  svn_fs_base__trail_debug(trail, "transactions", "cursor");
  SVN_ERR(BDB_WRAP(fs, N_("reading transaction list (opening cursor)"),
                   bfd->transactions->cursor(bfd->transactions,
                                             trail->db_txn, &cursor, 0)));

  /* Build a null-terminated array of keys in the transactions table. */
  for (db_err = svn_bdb_dbc_get(cursor,
                                svn_fs_base__result_dbt(&key),
                                svn_fs_base__result_dbt(&value),
                                DB_FIRST);
       db_err == 0;
       db_err = svn_bdb_dbc_get(cursor,
                                svn_fs_base__result_dbt(&key),
                                svn_fs_base__result_dbt(&value),
                                DB_NEXT))
    {
      transaction_t *txn;
      svn_skel_t *txn_skel;
      svn_error_t *err;

      /* Clear the per-iteration subpool */
      svn_pool_clear(subpool);

      /* Track the memory alloc'd for fetching the key and value here
         so that when the containing pool is cleared, this memory is
         freed. */
      svn_fs_base__track_dbt(&key, subpool);
      svn_fs_base__track_dbt(&value, subpool);

      /* Ignore the "next-key" key. */
      if (key.size == next_key_key_len
          && 0 == memcmp(key.data, NEXT_KEY_KEY, next_key_key_len))
        continue;

      /* Parse TRANSACTION skel */
      txn_skel = svn_skel__parse(value.data, value.size, subpool);
      if (! txn_skel)
        {
          svn_bdb_dbc_close(cursor);
          return svn_fs_base__err_corrupt_txn
            (fs, apr_pstrmemdup(pool, key.data, key.size));
        }

      /* Convert skel to native type. */
      if ((err = svn_fs_base__parse_transaction_skel(&txn, txn_skel,
                                                     subpool)))
        {
          svn_bdb_dbc_close(cursor);
          return svn_error_trace(err);
        }

      /* If this is an immutable "committed" transaction, ignore it. */
      if (is_committed(txn))
        continue;

      /* Add the transaction name to the NAMES array, duping it into POOL. */
      APR_ARRAY_PUSH(names, const char *) = apr_pstrmemdup(pool, key.data,
                                                           key.size);
    }

  /* Check for errors, but close the cursor first. */
  db_c_err = svn_bdb_dbc_close(cursor);
  if (db_err != DB_NOTFOUND)
    {
      SVN_ERR(BDB_WRAP(fs, N_("reading transaction list (listing keys)"),
                       db_err));
    }
  SVN_ERR(BDB_WRAP(fs, N_("reading transaction list (closing cursor)"),
                   db_c_err));

  /* Destroy the per-iteration subpool */
  svn_pool_destroy(subpool);

  *names_p = names;
  return SVN_NO_ERROR;
}