1 files changed, 156 insertions, 0 deletions
diff --git a/storage/perfschema/table_users.cc b/storage/perfschema/table_users.cc
new file mode 100644
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--- /dev/null
+++ b/storage/perfschema/table_users.cc
@@ -0,0 +1,156 @@
+/* Copyright (c) 2011, 2023, Oracle and/or its affiliates.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2.0,
+  as published by the Free Software Foundation.
+
+  This program is also distributed with certain software (including
+  but not limited to OpenSSL) that is licensed under separate terms,
+  as designated in a particular file or component or in included license
+  documentation.  The authors of MySQL hereby grant you an additional
+  permission to link the program and your derivative works with the
+  separately licensed software that they have included with MySQL.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License, version 2.0, for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#include "my_global.h"
+#include "my_thread.h"
+#include "table_users.h"
+#include "pfs_instr_class.h"
+#include "pfs_instr.h"
+#include "pfs_account.h"
+#include "pfs_user.h"
+#include "pfs_visitor.h"
+#include "pfs_memory.h"
+#include "pfs_status.h"
+#include "field.h"
+
+THR_LOCK table_users::m_table_lock;
+
+PFS_engine_table_share_state
+table_users::m_share_state = {
+  false /* m_checked */
+};
+
+PFS_engine_table_share
+table_users::m_share=
+{
+  { C_STRING_WITH_LEN("users") },
+  &pfs_truncatable_acl,
+  table_users::create,
+  NULL, /* write_row */
+  table_users::delete_all_rows,
+  cursor_by_user::get_row_count,
+  sizeof(PFS_simple_index), /* ref length */
+  &m_table_lock,
+  { C_STRING_WITH_LEN("CREATE TABLE users("
+                      "USER CHAR(" USERNAME_CHAR_LENGTH_STR ") collate utf8_bin default null comment 'The connection''s client user name for the connection, or NULL if an internal thread.',"
+                      "CURRENT_CONNECTIONS bigint not null comment 'Current connections for the user.',"
+                      "TOTAL_CONNECTIONS bigint not null comment 'Total connections for the user.')") },
+  false, /* m_perpetual */
+  false, /* m_optional */
+  &m_share_state
+};
+
+PFS_engine_table* table_users::create()
+{
+  return new table_users();
+}
+
+int
+table_users::delete_all_rows(void)
+{
+  reset_events_waits_by_thread();
+  reset_events_waits_by_account();
+  reset_events_waits_by_user();
+  reset_events_stages_by_thread();
+  reset_events_stages_by_account();
+  reset_events_stages_by_user();
+  reset_events_statements_by_thread();
+  reset_events_statements_by_account();
+  reset_events_statements_by_user();
+  reset_events_transactions_by_thread();
+  reset_events_transactions_by_account();
+  reset_events_transactions_by_user();
+  reset_memory_by_thread();
+  reset_memory_by_account();
+  reset_memory_by_user();
+  reset_status_by_thread();
+  reset_status_by_account();
+  reset_status_by_user();
+  purge_all_account();
+  purge_all_user();
+  return 0;
+}
+
+table_users::table_users()
+  : cursor_by_user(& m_share),
+  m_row_exists(false)
+{}
+
+void table_users::make_row(PFS_user *pfs)
+{
+  pfs_optimistic_state lock;
+
+  m_row_exists= false;
+  pfs->m_lock.begin_optimistic_lock(&lock);
+
+  if (m_row.m_user.make_row(pfs))
+    return;
+
+  PFS_connection_stat_visitor visitor;
+  PFS_connection_iterator::visit_user(pfs,
+                                      true,  /* accounts */
+                                      true,  /* threads */
+                                      false, /* THDs */
+                                      & visitor);
+
+  if (! pfs->m_lock.end_optimistic_lock(& lock))
+    return;
+
+  m_row.m_connection_stat.set(& visitor.m_stat);
+  m_row_exists= true;
+}
+
+int table_users::read_row_values(TABLE *table,
+                                 unsigned char *buf,
+                                 Field **fields,
+                                 bool read_all)
+{
+  Field *f;
+
+  if (unlikely(! m_row_exists))
+    return HA_ERR_RECORD_DELETED;
+
+  /* Set the null bits */
+  assert(table->s->null_bytes == 1);
+  buf[0]= 0;
+
+  for (; (f= *fields) ; fields++)
+  {
+    if (read_all || bitmap_is_set(table->read_set, f->field_index))
+    {
+      switch(f->field_index)
+      {
+      case 0: /* USER */
+        m_row.m_user.set_field(f);
+        break;
+      case 1: /* CURRENT_CONNECTIONS */
+      case 2: /* TOTAL_CONNECTIONS */
+        m_row.m_connection_stat.set_field(f->field_index - 1, f);
+        break;
+      default:
+        assert(false);
+      }
+    }
+  }
+  return 0;
+}
+