table_session_connect.h

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/* Copyright (c) 2012, 2023, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  as designated in a particular file or component or in included license
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef TABLE_SESSION_CONNECT_H
#define TABLE_SESSION_CONNECT_H
 
/**
  @file storage/perfschema/table_session_connect.h
  TABLE SESSION_CONNECT (abstract)
*/
 
#include <sys/types.h>
 
#include "storage/perfschema/cursor_by_thread_connect_attr.h"
#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/table_helper.h"
 
struct CHARSET_INFO;
 
#define MAX_ATTR_NAME_CHARS 32
#define MAX_ATTR_VALUE_CHARS 1024
#define MAX_UTF8MB4_BYTES 4
 
/** symbolic names for field offsets, keep in sync with field_types */
enum field_offsets {
  FO_PROCESS_ID,
  FO_ATTR_NAME,
  FO_ATTR_VALUE,
  FO_ORDINAL_POSITION
};
 
/**
  A row of PERFORMANCE_SCHEMA.SESSION_CONNECT_ATTRS and
  PERFORMANCE_SCHEMA.SESSION_ACCOUNT_CONNECT_ATTRS.
*/
struct row_session_connect_attrs {
  /** Column PROCESS_ID. */
  ulong m_process_id;
  /** Column ATTR_NAME. In UTF8MB4 */
  char m_attr_name[MAX_ATTR_NAME_CHARS * MAX_UTF8MB4_BYTES];
  /** Length in bytes of @c m_attr_name. */
  uint m_attr_name_length;
  /** Column ATTR_VALUE. In UTF8MB4 */
  char m_attr_value[MAX_ATTR_VALUE_CHARS * MAX_UTF8MB4_BYTES];
  /** Length in bytes of @c m_attr_name. */
  uint m_attr_value_length;
  /** Column ORDINAL_POSITION. */
  ulong m_ordinal_position;
};
 
class PFS_index_session_connect : public PFS_engine_index {
 public:
  PFS_index_session_connect()
      : PFS_engine_index(&m_key_1, &m_key_2),
        m_key_1("PROCESSLIST_ID"),
        m_key_2("ATTR_NAME") {}
 
  ~PFS_index_session_connect() override = default;
 
  virtual bool match(PFS_thread *pfs);
  virtual bool match(row_session_connect_attrs *row);
 
 private:
  PFS_key_processlist_id m_key_1;
  PFS_key_name m_key_2;
};
 
/** Abstract table PERFORMANCE_SCHEMA.SESSION_CONNECT_ATTRS. */
class table_session_connect : public cursor_by_thread_connect_attr {
 protected:
  explicit table_session_connect(const PFS_engine_table_share *share);
 
 public:
  ~table_session_connect() override;
 
 protected:
  int index_init(uint idx, bool sorted) override;
  int index_next() override;
 
  int make_row(PFS_thread *pfs, uint ordinal) override;
  virtual bool thread_fits(PFS_thread *thread);
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
 
 protected:
  /** Current row. */
  row_session_connect_attrs m_row;
  /** Safe copy of @c PFS_thread::m_session_connect_attrs. */
  char *m_copy_session_connect_attrs;
  /** Safe copy of @c PFS_thread::m_session_connect_attrs_length. */
  uint m_copy_session_connect_attrs_length;
 
  PFS_index_session_connect *m_opened_index;
};
 
bool read_nth_attr(const char *connect_attrs, uint connect_attrs_length,
                   const CHARSET_INFO *connect_attrs_cs, uint ordinal,
                   char *attr_name, uint max_attr_name, uint *attr_name_length,
                   char *attr_value, uint max_attr_value,
                   uint *attr_value_length);
 
#endif