table_processlist.h

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/* Copyright (c) 2008, 2024, 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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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  You should have received a copy of the GNU General Public License
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef TABLE_PROCESSLIST_H
#define TABLE_PROCESSLIST_H
 
/**
  @file storage/perfschema/table_processlist.h
  TABLE THREADS.
*/
 
#include <sys/types.h>
#include <time.h>
#include <algorithm>
 
#include "my_hostname.h"
#include "my_inttypes.h"
#include "storage/perfschema/cursor_by_thread.h"
#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/pfs_name.h"
 
struct PFS_thread;
 
/**
  @addtogroup performance_schema_tables
  @{
*/
 
/**
  A row of PERFORMANCE_SCHEMA.PROCESSLIST.
*/
struct row_processlist {
  /** Column ID. */
  ulonglong m_processlist_id{0};
  /** Column USER. */
  PFS_user_name m_user_name;
  /** Column HOST (and PORT). */
  char m_hostname[HOST_AND_PORT_LENGTH];
  /** Length in bytes of @c m_hostname. */
  uint m_hostname_length{0};
  /** Column DB. */
  PFS_schema_name m_db_name;
  /** Column COMMAND. */
  int m_command{0};
  /** Column TIME. */
  time_t m_start_time{0};
  /** Column STATE. */
  const char *m_processlist_state_ptr{nullptr};
  /** Length in bytes of @c m_processlist_state_ptr. */
  uint m_processlist_state_length{0};
  /** Column INFO. */
  const char *m_processlist_info_ptr{nullptr};
  /** Length in bytes of @c m_processlist_info_ptr. */
  uint m_processlist_info_length{0};
  /** Column EXECUTION_ENGINE. */
  bool m_secondary{false};
};
 
class PFS_index_processlist_by_processlist_id : public PFS_index_threads {
 public:
  PFS_index_processlist_by_processlist_id()
      : PFS_index_threads(&m_key), m_key("ID") {}
 
  ~PFS_index_processlist_by_processlist_id() override = default;
 
  bool match(PFS_thread *pfs) override;
 
 private:
  PFS_key_processlist_id m_key;
};
 
enum enum_priv_processlist {
  /** User is not allowed to see any data. */
  PROCESSLIST_DENIED,
  /** User does not have the PROCESS_ACL privilege. */
  PROCESSLIST_USER_ONLY,
  /** User has the PROCESS_ACL privilege. */
  PROCESSLIST_ALL
};
 
struct row_priv_processlist {
  enum enum_priv_processlist m_auth;
  char m_priv_user[USERNAME_LENGTH];
  size_t m_priv_user_length;
};
 
/** Table PERFORMANCE_SCHEMA.PROCESSLIST. */
class table_processlist : public cursor_by_thread {
 public:
  /** Table share */
  static PFS_engine_table_share m_share;
  /** Table builder */
  static PFS_engine_table *create(PFS_engine_table_share *);
 
 protected:
  table_processlist();
 
  int rnd_init(bool scan [[maybe_unused]]) override;
 
  int index_init(uint idx, bool sorted) override;
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
  int set_access();
 
 public:
  ~table_processlist() override = default;
 
 private:
  int make_row(PFS_thread *pfs) override;
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
  /** Current row. */
  row_processlist m_row;
  /** Row privileges. */
  row_priv_processlist m_row_priv;
};
 
/** @} */
#endif