/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   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 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#include <stdlib.h>
#include <my_global.h>
#include "my_sys.h"                             // my_write, my_malloc
#include <mysql/plugin.h>
#include "mysql_com.h"
#include "m_string.h"
#include "sql_string.h" /* STRING_PSI_MEMORY_KEY */


static const char *log_filename= "test_session_info";


static File outfile;

#define STRING_BUFFER_SIZE 512

#define WRITE_STR(format) \
  { \
    my_snprintf(buffer, sizeof(buffer), (format)); \
    my_write(outfile, (uchar*) buffer, strlen(buffer), MYF(0)); \
  }


#define WRITE_VAL(format,value) \
  { \
    my_snprintf(buffer, sizeof(buffer), (format), (value)); \
    my_write(outfile, (uchar*)buffer, strlen(buffer), MYF(0)); \
  }

#define WRITE_VAL2(format,value1, value2) \
  { \
    my_snprintf(buffer, sizeof(buffer), (format), (value1), (value2)); \
    my_write(outfile, (uchar*) buffer, strlen(buffer), MYF(0)); \
  }

static const char *sep = "============================================================================================\n";

#define WRITE_SEP() my_write(outfile, (uchar*)sep, strlen(sep), MYF(0))

static const char *user_localhost = "localhost";
static const char *user_local = "127.0.0.1";
static const char *user_db= "";
static const char *user_privileged= "root";
//static const char *user_ordinary= "ordinary";

static void switch_user(MYSQL_SESSION session, const char *user)
{
  MYSQL_SECURITY_CONTEXT sc;
  thd_get_security_context(srv_session_info_get_thd(session), &sc);
  security_context_lookup(sc, user, user_localhost, user_local, user_db);
}


/* Session declarations */
COM_DATA cmd;


struct st_send_field_n
{
  char db_name[256];
  char table_name[256];
  char org_table_name[256];
  char col_name[256];
  char org_col_name[256];
  unsigned long length;
  unsigned int charsetnr;
  unsigned int flags;
  unsigned int decimals;
  enum_field_types type;
};


struct st_decimal_n
{
  int    intg, frac, len;
  my_bool sign;
  decimal_digit_t buf[256];
};


struct st_plugin_ctx
{
  const CHARSET_INFO *resultcs;
  uint meta_server_status;
  uint meta_warn_count;
  uint current_col;
  uint num_cols;
  uint num_rows;
  st_send_field_n sql_field[64];
  char sql_str_value[64][64][256];
  size_t sql_str_len[64][64];
  longlong sql_int_value[64][64];
  longlong sql_longlong_value[64][64];
  uint sql_is_unsigned[64][64];
  st_decimal_n sql_decimal_value[64][64];
  double sql_double_value[64][64];
  uint32 sql_double_decimals[64][64];
  MYSQL_TIME sql_date_value[64][64];
  MYSQL_TIME sql_time_value[64][64];
  uint sql_time_decimals[64][64];
  MYSQL_TIME sql_datetime_value[64][64];
  uint sql_datetime_decimals[64][64];

  uint server_status;
  uint warn_count;
  uint affected_rows;
  uint last_insert_id;
  char message[1024];

  uint sql_errno;
  char err_msg[1024];
  char sqlstate[6];
  st_plugin_ctx()
  {
    reset();
  }

  void reset()
  {
    resultcs= NULL;
    server_status= 0;
    current_col= 0;
    warn_count= 0;
    num_cols= 0;
    num_rows= 0;
    memset(&sql_field, 0, 64 * sizeof(st_send_field_n));
    memset(&sql_str_value, 0, 64 * 64 * 256 * sizeof(char));
    memset(&sql_str_len, 0, 64 * 64 * sizeof(size_t));
    memset(&sql_int_value, 0, 64 * 64 * sizeof(longlong));
    memset(&sql_longlong_value, 0, 64 * 64 * sizeof(longlong));
    memset(&sql_is_unsigned, 0, 64 * 64 * sizeof(uint));
    memset(&sql_decimal_value, 0, 64 * 64 * sizeof(st_decimal_n));
    memset(&sql_double_value, 0, 64 * 64 * sizeof(double));
    memset(&sql_double_decimals, 0, 64 * 64 * sizeof(uint32));
    memset(&sql_date_value, 0, 64 * 64 * sizeof(MYSQL_TIME));
    memset(&sql_time_value, 0, 64 * 64 * sizeof(MYSQL_TIME));
    memset(&sql_time_decimals, 0, 64 * 64 * sizeof(uint));
    memset(&sql_datetime_value, 0, 64 * 64 * sizeof(MYSQL_TIME));
    memset(&sql_datetime_decimals, 0, 64 * 64 * sizeof(uint));

    server_status= 0;
    warn_count= 0;
    affected_rows= 0;
    last_insert_id= 0;
    memset(&message, 0, sizeof(message));

    sql_errno= 0;
    memset(&err_msg, 0, sizeof(err_msg));
    memset(&sqlstate, 0, sizeof(sqlstate));
  }
};


static int sql_start_result_metadata(void *ctx, uint num_cols, uint flags,
                                     const CHARSET_INFO *resultcs)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_start_result_metadata");
  DBUG_PRINT("info",("resultcs->number: %d", resultcs->number));
  DBUG_PRINT("info",("resultcs->csname: %s", resultcs->csname));
  DBUG_PRINT("info",("resultcs->name: %s", resultcs->name));
  pctx->num_cols= num_cols;
  pctx->resultcs= resultcs;
  pctx->current_col= 0;
  DBUG_RETURN(false);
}


static int sql_field_metadata(void *ctx, struct st_send_field *field,
                              const CHARSET_INFO *charset)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  st_send_field_n *cfield= &pctx->sql_field[pctx->current_col];
  DBUG_ENTER("sql_field_metadata");
  DBUG_PRINT("info",("field->db_name: %s", field->db_name));
  DBUG_PRINT("info",("field->table_name: %s", field->table_name));
  DBUG_PRINT("info",("field->org_table_name: %s", field->org_table_name));
  DBUG_PRINT("info",("field->col_name: %s", field->col_name));
  DBUG_PRINT("info",("field->org_col_name: %s", field->org_col_name));
  DBUG_PRINT("info",("field->length: %d", (int)field->length));
  DBUG_PRINT("info",("field->charsetnr: %d", (int)field->charsetnr));
  DBUG_PRINT("info",("field->flags: %d", (int)field->flags));
  DBUG_PRINT("info",("field->decimals: %d", (int)field->decimals));
  DBUG_PRINT("info",("field->type: %d", (int)field->type));

  strcpy(cfield->db_name,        (char*)field->db_name);
  strcpy(cfield->table_name,     (char*)field->table_name);
  strcpy(cfield->org_table_name, (char*)field->org_table_name);
  strcpy(cfield->col_name,       (char*)field->col_name);
  strcpy(cfield->org_col_name,   (char*)field->org_col_name);
  cfield->length=    field->length;
  cfield->charsetnr= field->charsetnr;
  cfield->flags=     field->flags;
  cfield->decimals=  field->decimals;
  cfield->type=      field->type;

  pctx->current_col++;
  DBUG_RETURN(false);
}


static int sql_end_result_metadata(void *ctx, uint server_status,
                                   uint warn_count)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_end_result_metadata");
  pctx->meta_server_status= server_status;
  pctx->meta_warn_count= warn_count;
  pctx->num_rows= 0;
  DBUG_RETURN(false);
}


static int sql_start_row(void *ctx)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_start_row");
  pctx->current_col= 0;
  DBUG_RETURN(false);
};


static int sql_end_row(void *ctx)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_end_row");
  pctx->num_rows++;
  DBUG_RETURN(false);
}


static void sql_abort_row(void *ctx)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_abort_row");
  pctx->current_col= 0;
  DBUG_VOID_RETURN;
}


static ulong sql_get_client_capabilities(void *ctx){
  DBUG_ENTER("sql_get_client_capabilities");
  DBUG_RETURN(0);
}


static int sql_get_null(void *ctx)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_null");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  strcpy(pctx->sql_str_value[row][col], "[NULL]");
  pctx->sql_str_len[row][col]=  sizeof("[NULL]")-1;

  DBUG_RETURN(false);
}


static int sql_get_integer(void * ctx, longlong value)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_integer");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer), "%d", value);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;
  pctx->sql_int_value[row][col]= value;

  DBUG_RETURN(false);
}


static int sql_get_longlong(void * ctx, longlong value, uint is_unsigned)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_longlong");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer),
                          is_unsigned? "%llu":"%lld", value);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;
  pctx->sql_longlong_value[row][col]= value;
  pctx->sql_is_unsigned[row][col]= is_unsigned;

  DBUG_RETURN(false);
}


static int sql_get_decimal(void * ctx, const decimal_t * value)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_decimal");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer),
                          "%s%d.%d(%d)[%s]",
                          value->sign? "+":"-",
                          value->intg, value->frac, value->len,
                          value->buf);

  strncpy(pctx->sql_str_value[row][col], buffer, len);

  pctx->sql_str_len[row][col]= len;
  pctx->sql_decimal_value[row][col].intg= value->intg;
  pctx->sql_decimal_value[row][col].frac= value->frac;
  pctx->sql_decimal_value[row][col].len = value->len ;
  pctx->sql_decimal_value[row][col].sign=  value->sign;
  memset((void*)pctx->sql_decimal_value[row][col].buf, '\0',(int)value->len);
  memcpy((void*)pctx->sql_decimal_value[row][col].buf, (void*)value->buf,(int)value->len);

  DBUG_RETURN(false);
}


static int sql_get_double(void * ctx, double value, uint32 decimals)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_double");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer), "%3.7g", value);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;

  pctx->sql_double_value[row][col]= value;
  pctx->sql_double_decimals[row][col]= decimals;
 
  DBUG_RETURN(false);
};


static int sql_get_date(void * ctx, const MYSQL_TIME * value)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_date");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer),
                          "%s%4d-%02d-%02d",
                          value->neg? "-":"",
                          value->year, value->month, value->day);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;

  pctx->sql_date_value[row][col].year=        value->year;
  pctx->sql_date_value[row][col].month=       value->month;
  pctx->sql_date_value[row][col].day=         value->day;

  pctx->sql_date_value[row][col].hour=        value->hour;
  pctx->sql_date_value[row][col].minute=      value->minute;
  pctx->sql_date_value[row][col].second=      value->second;
  pctx->sql_date_value[row][col].second_part= value->second_part;
  pctx->sql_date_value[row][col].neg=         value->neg;

  DBUG_RETURN(false);
}


static int sql_get_time(void * ctx, const MYSQL_TIME * value, uint decimals)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_time");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer),
                          "%s%02d:%02d:%02d",
                          value->neg? "-":"",
                          value->day? (value->day*24 + value->hour):value->hour,
                          value->minute, value->second);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;

  pctx->sql_time_value[row][col].year=        value->year;
  pctx->sql_time_value[row][col].month=       value->month;
  pctx->sql_time_value[row][col].day=         value->day;

  pctx->sql_time_value[row][col].hour=        value->hour;
  pctx->sql_time_value[row][col].minute=      value->minute;
  pctx->sql_time_value[row][col].second=      value->second;
  pctx->sql_time_value[row][col].second_part= value->second_part;
  pctx->sql_time_value[row][col].neg=         value->neg;
  pctx->sql_time_decimals[row][col]=          decimals;

  DBUG_RETURN(false);
}


static int sql_get_datetime(void * ctx, const MYSQL_TIME * value, uint decimals)
{
  char buffer[1024];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_datetime");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  size_t len= my_snprintf(buffer, sizeof(buffer),
                          "%s%4d-%02d-%02d %02d:%02d:%02d",
                          value->neg? "-":"",
                          value->year, value->month, value->day,
                          value->hour, value->minute, value->second);

  strncpy(pctx->sql_str_value[row][col], buffer, len);
  pctx->sql_str_len[row][col]= len;

  pctx->sql_datetime_value[row][col].year=        value->year;
  pctx->sql_datetime_value[row][col].month=       value->month;
  pctx->sql_datetime_value[row][col].day=         value->day;

  pctx->sql_datetime_value[row][col].hour=        value->hour;
  pctx->sql_datetime_value[row][col].minute=      value->minute;
  pctx->sql_datetime_value[row][col].second=      value->second;
  pctx->sql_datetime_value[row][col].second_part= value->second_part;
  pctx->sql_datetime_value[row][col].neg=         value->neg;
  pctx->sql_datetime_decimals[row][col]=          decimals;

  DBUG_RETURN(false);
}


static int sql_get_string(void * ctx, const char * const value, size_t length,
                          const CHARSET_INFO * const valuecs)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_get_string");
  uint row= pctx->num_rows;
  uint col= pctx->current_col;
  pctx->current_col++;

  strncpy(pctx->sql_str_value[row][col], value, length);
  pctx->sql_str_len[row][col]= length;

  DBUG_RETURN(false);
}


static void sql_handle_ok(void * ctx,
                          uint server_status, uint statement_warn_count,
                          ulonglong affected_rows, ulonglong last_insert_id,
                          const char * const message)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_handle_ok");
  /* This could be an EOF */
  if (!pctx->num_cols)
    pctx->num_rows= 0;
  pctx->server_status=  server_status;
  pctx->warn_count=     statement_warn_count;
  pctx->affected_rows=  affected_rows;
  pctx->last_insert_id= last_insert_id;
  if (message)
    strncpy(pctx->message, message, sizeof(pctx->message));

  DBUG_VOID_RETURN;
}


static void sql_handle_error(void * ctx, uint sql_errno,
                             const char * const err_msg,
                             const char * const sqlstate)
{
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  DBUG_ENTER("sql_handle_error");
  pctx->sql_errno=sql_errno;
  if (pctx->sql_errno)
  {
    strcpy(pctx->err_msg,(char *)err_msg);
    strcpy(pctx->sqlstate,(char*)sqlstate);
  }
  pctx->num_rows= 0;
  DBUG_VOID_RETURN;
};


static void sql_shutdown(void *ctx, int shutdown_server)
{
  DBUG_ENTER("sql_shutdown");
  DBUG_VOID_RETURN;
}


const struct st_command_service_cbs sql_cbs= {
  sql_start_result_metadata,
  sql_field_metadata,
  sql_end_result_metadata,
  sql_start_row,
  sql_end_row,
  sql_abort_row,
  sql_get_client_capabilities,
  sql_get_null,
  sql_get_integer,
  sql_get_longlong,
  sql_get_decimal,
  sql_get_double,
  sql_get_date,
  sql_get_time,
  sql_get_datetime,
  sql_get_string,
  sql_handle_ok,
  sql_handle_error,
  sql_shutdown,
};


static void get_data_str(void * ctx)
{
  char buffer[STRING_BUFFER_SIZE];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;

  /* get values */
  if ((pctx->num_rows > 0) && (pctx->num_cols > 0))
  {
    for (uint col_count= 0; col_count < pctx->num_cols; col_count++)
    {
      WRITE_VAL("%s  ", pctx->sql_field[col_count].col_name);
    }
    WRITE_STR("\n");

    for (uint row_count= 0; row_count < pctx->num_rows; row_count++)
    {
      for (uint col_count= 0; col_count < pctx->num_cols; col_count++)
      {
        WRITE_VAL("%s  ", pctx->sql_str_value[row_count][col_count]);
      }
      WRITE_STR("\n");
    }
    WRITE_STR("\n");

    /* Metadata */
    WRITE_VAL("num_cols      : %d\n", pctx->num_cols);
    WRITE_VAL("nb rows       : %d\n", pctx->num_rows);
  }
}


static void handle_error(void * ctx)
{
  char buffer[STRING_BUFFER_SIZE];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  /* handle_ok/error */ 
  WRITE_VAL("error     : %d\n",pctx->sql_errno);
  WRITE_VAL("error msg : %s\n",pctx->err_msg);
}

#define EXEC_TEST_CMD(s, q, p, ctx)           exec_test_cmd((s), (q), (p), (ctx), false, __FUNCTION__, __LINE__)
#define EXEC_TEST_CMD_EX(s, q, p, ctx, err)   exec_test_cmd((s), (q), (p), (ctx), (err), __FUNCTION__, __LINE__)

static void exec_test_cmd(MYSQL_SESSION session, const char *query, void *p, void * ctx, bool expect_error, const char * func, uint line)
{
  char buffer[STRING_BUFFER_SIZE];
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  pctx->reset();
  cmd.com_query.query= query;
  cmd.com_query.length= strlen(cmd.com_query.query);
  WRITE_VAL("%s\n", query);
  int fail= command_service_run_command(session,COM_QUERY,&cmd, &my_charset_utf8_general_ci,
                                        &sql_cbs, CS_TEXT_REPRESENTATION, ctx);
  if (fail)
  {
    srv_session_close(session);
    if (!expect_error)
      my_plugin_log_message(&p, MY_ERROR_LEVEL, "test_session_info - ret code : %d at %s:%u", fail, func, line);
  }
  else if (pctx->sql_errno)
    handle_error(ctx);
  else if (expect_error)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "test_session_info - expected error but command did not fail at %s:%u", func, line);
  else
  {
    if (pctx->num_cols)
      get_data_str(ctx);
    WRITE_VAL("affected rows : %d\n", pctx->affected_rows);
    WRITE_VAL("server status : %d\n", pctx->server_status);
    WRITE_VAL("warn count    : %d\n", pctx->warn_count);
  }
  WRITE_STR("\n");
}


static void test_com_init_db(void *p, MYSQL_SESSION st_session, const char *db_name)
{
  char buffer[STRING_BUFFER_SIZE];
  DBUG_ENTER("test_com_init_db");

  struct st_plugin_ctx *plugin_ctx= new st_plugin_ctx();

  COM_DATA cmd;

  LEX_CSTRING lex_db_name= srv_session_info_get_current_db(st_session);
  WRITE_VAL("current_db before init_db : %s\n", lex_db_name.str);

  cmd.com_init_db.db_name = db_name;
  cmd.com_init_db.length = strlen(db_name);

  int fail= command_service_run_command(st_session, COM_INIT_DB, &cmd,
                                        &my_charset_utf8_general_ci,
                                        &sql_cbs, CS_TEXT_REPRESENTATION,
                                        plugin_ctx);

  if (fail)
  {
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "run_statement code: %d\n", fail);
    delete plugin_ctx;
    DBUG_VOID_RETURN;
  }

  lex_db_name= srv_session_info_get_current_db(st_session);
  WRITE_VAL("current_db after init_db  : %s\n", lex_db_name.str);

  delete plugin_ctx;
  DBUG_VOID_RETURN;
}


static void test_sql(void *p)
{
  char buffer[STRING_BUFFER_SIZE];
  char buffer_query[STRING_BUFFER_SIZE];

  DBUG_ENTER("test_sql");
  MYSQL_SESSION session_1, session_2, session_3;
  struct st_plugin_ctx *plugin_ctx= new st_plugin_ctx();
      
  /* Opening session 1 */
  WRITE_STR("Opening Session 1\n");
  session_1= srv_session_open(NULL,plugin_ctx);
  if (!session_1)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Opening Session 1 failed");
  else
    switch_user(session_1, user_privileged);

  /* Opening session 2 */
  WRITE_STR("Opening Session 2\n");
  session_2= srv_session_open(NULL,plugin_ctx);
  if (!session_2)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Opening Session 2 failed");
  else
    switch_user(session_2, user_privileged);

  /* srv_session_info_get_thd and srv_session_info_get_session_id*/
  /* Session 1 */
  WRITE_SEP();
  WRITE_STR("Session 1 : srv_session_info_get_thd and srv_session_info_get_session_id\n");
  WRITE_SEP();
  my_thread_id session_1_id= srv_session_info_get_session_id(session_1);
  my_thread_id session_2_id= srv_session_info_get_session_id(session_2);
  MYSQL_THD thd= srv_session_info_get_thd(session_1);
  unsigned long thd_id= thd_get_thread_id(thd);
  if (thd_id != session_1_id)
  {
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Thread handler id is NOT equal to session id srv_session_info_get_session_id(session_1)");
    DBUG_VOID_RETURN;
  }
  else
  {
    WRITE_STR("Thread handler id IS equal to session id returned by srv_session_info_get_session_id(Session_1)\n\n");
  }

  /* Session 2 */
  WRITE_SEP();
  WRITE_STR("Session 2 : srv_session_info_get_thd and srv_session_info_get_session_id\n");
  WRITE_SEP();
  thd= srv_session_info_get_thd(session_2);
  thd_id= thd_get_thread_id(thd);

  if (thd_id != session_2_id)
  {
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Thread handler id is NOT equal to session id srv_session_info_get_session_id(session_2)");
    delete plugin_ctx;
    DBUG_VOID_RETURN;
  }
  else
  {
    WRITE_STR("Thread handler id IS equal to session id returned by srv_session_info_get_session_id(Session_2)\n\n");
  }

  /* All information from performance_schema  */
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT name,type,processlist_id,processlist_user,processlist_host,processlist_db,processlist_command,processlist_state,processlist_info,role,instrumented,history,connection_type FROM performance_schema.threads WHERE processlist_id =  %lu",  session_1_id);
  EXEC_TEST_CMD(session_1, buffer_query, p, plugin_ctx);

  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT name,type,processlist_id,processlist_user,processlist_host,processlist_db,processlist_command,processlist_state,processlist_info,role,instrumented,history,connection_type FROM performance_schema.threads WHERE processlist_id =  %lu",  session_2_id);
  EXEC_TEST_CMD(session_2, buffer_query, p, plugin_ctx);

  /* srv_session_info_get_current_db */
  /* Session 1 */
  WRITE_SEP();
  WRITE_STR("Session 1 : srv_session_info_get_current_db\n");
  WRITE_SEP();
  EXEC_TEST_CMD(session_1, "/*Session_1*/ SHOW TABLES LIKE '%slave%'", p, plugin_ctx);
  test_com_init_db(p, session_1, "mysql");
  WRITE_STR("\n");
  EXEC_TEST_CMD(session_1, "/*Session_1*/ SHOW TABLES LIKE '%slave%'", p, plugin_ctx);

  EXEC_TEST_CMD(session_1, "/*Session_1*/ USE information_schema", p, plugin_ctx);
  LEX_CSTRING db_name= srv_session_info_get_current_db(session_1);
  WRITE_VAL("current_db after 'USE db_name' command : %s\n\n", db_name.str);

  test_com_init_db(p, session_1, "test");
  WRITE_STR("\n");
  EXEC_TEST_CMD(session_1, "/*Session_1*/ SHOW TABLES", p, plugin_ctx);
  /* Session 2 */
  WRITE_SEP();
  WRITE_STR("Session 2 : srv_session_info_get_current_db\n");
  WRITE_SEP();
  EXEC_TEST_CMD(session_2, "/*Session_2*/ SHOW TABLES LIKE '%slave%'", p, plugin_ctx);
  test_com_init_db(p, session_2, "mysql");
  WRITE_STR("\n");
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, "/*Session_2*/ SHOW TABLES LIKE '%slave%'", p, plugin_ctx);

  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, "/*Session_2*/ USE information_schema", p, plugin_ctx);
  db_name= srv_session_info_get_current_db(session_2);
  WRITE_VAL("current_db after 'USE db_name' command : %s\n\n", db_name.str);

  test_com_init_db(p, session_2, "test");
  WRITE_STR("\n");
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, "/*Session_2*/ SHOW TABLES", p, plugin_ctx);

  /* srv_session_info_set/get_client_port */
  /* Session 1 */
  WRITE_SEP();
  WRITE_STR("Session 1 : srv_session_info_set/get_client_port\n");
  WRITE_SEP();
  WRITE_VAL("Port before srv_session_info_set_client_port : %d\n", srv_session_info_get_client_port(session_1));
  srv_session_info_set_client_port(session_1, 100);
  WRITE_VAL("Port after srv_session_info_set_client_port  : %d\n\n", srv_session_info_get_client_port(session_1));

  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, "/*Session_1*/ SELECT host FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, "/*Session_2*/ SELECT host FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);

  /* Session 2 */
  WRITE_SEP();
  WRITE_STR("Session 2 : srv_session_info_set/get_client_port\n");
  WRITE_SEP();
  WRITE_VAL("Port before srv_session_info_set_client_port : %d\n", srv_session_info_get_client_port(session_2));
  srv_session_info_set_client_port(session_2, 200);
  WRITE_VAL("Port after srv_session_info_set_client_port  : %d\n\n", srv_session_info_get_client_port(session_2));

  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, "/*Session_1*/ SELECT host FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, "/*Session_2*/ SELECT host FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);

  /* srv_session_info_set_connection_type */
  /* Session 1 */
  WRITE_SEP();
  WRITE_STR("Session 1 : srv_session_info_set_connection_type\n");
  WRITE_SEP();
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE, CONNECTION_TYPE IS NULL FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_1_id*/",  session_1_id);
  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, buffer_query, p, plugin_ctx);

  WRITE_STR("Setting NO_VIO_TYPE on session_1\n");
  if (0 == srv_session_info_set_connection_type(session_1, NO_VIO_TYPE))
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "srv_session_info_set_connection_type(NO_VIO_TYPE) should fail but did not");

  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_1_id*/", session_1_id);
  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, buffer_query, p, plugin_ctx);

  WRITE_STR("Setting VIO_TYPE_TCPIP on session_1\n");
  srv_session_info_set_connection_type(session_1, VIO_TYPE_TCPIP);
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_1_id*/", session_1_id);
  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, buffer_query, p, plugin_ctx);

  WRITE_STR("Setting VIO_TYPE_NAMEDPIPE on session_1\n");
  srv_session_info_set_connection_type(session_1, VIO_TYPE_NAMEDPIPE);
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_1_id*/", session_1_id);
  WRITE_STR("Session 1's view\n");
  EXEC_TEST_CMD(session_1, buffer_query, p, plugin_ctx);

  /* Session 2 */
  WRITE_SEP();
  WRITE_STR("Session 2 : srv_session_info_set_connection_type\n");
  WRITE_SEP();
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_2_id*/", session_2_id);
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, buffer_query, p, plugin_ctx);

  /* Now test with SSL/TLS */
  WRITE_STR("Setting VIO_TYPE_SSL on session_2\n");
  srv_session_info_set_connection_type(session_2, VIO_TYPE_SSL);
  /* Don't delete the following. We check if set of type on detached session will affect PFS. The thread should be SSL */
  WRITE_STR("Setting VIO_TYPE_TCPIP on session_1\n");
  srv_session_info_set_connection_type(session_1, VIO_TYPE_TCPIP); 
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu /*session_2_id*/", session_2_id);
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, buffer_query, p, plugin_ctx);

  srv_session_info_set_connection_type(session_2, VIO_TYPE_SHARED_MEMORY);
  my_snprintf(buffer_query, sizeof(buffer_query), "SELECT CONNECTION_TYPE FROM performance_schema.threads WHERE PROCESSLIST_ID =  %lu  /*session_2_id*/", session_2_id);
  WRITE_STR("Session 2's view\n");
  EXEC_TEST_CMD(session_2, buffer_query, p, plugin_ctx);

  /* srv_session_info_killed */
  /* Session 1 */
  WRITE_SEP();
  WRITE_STR("BEFORE kill of Session 1\n");
  WRITE_SEP();
  EXEC_TEST_CMD(session_1, "SELECT ID, USER, HOST, DB, COMMAND, INFO FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);
  WRITE_SEP();
  WRITE_VAL("srv_session_info_killed(Session_1) : %d\n", srv_session_info_killed(session_1));
  WRITE_VAL("srv_session_info_killed(Session_2) : %d\n", srv_session_info_killed(session_2));

  WRITE_SEP();
  WRITE_STR("Killing Session 1\n");
  my_snprintf(buffer_query, sizeof(buffer_query), "KILL CONNECTION %lu /*session_1_id*/", session_1_id);
  EXEC_TEST_CMD(session_2, buffer_query, p, plugin_ctx);

  WRITE_SEP();
  WRITE_STR("AFTER kill of Session 1\n");
  WRITE_SEP();
  EXEC_TEST_CMD_EX(session_1, "SELECT ID, USER, HOST, DB, COMMAND, INFO FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx, true);
  WRITE_SEP();
  WRITE_VAL("srv_session_info_killed(Session 1) : %d\n", srv_session_info_killed(session_1));
  WRITE_VAL("srv_session_info_killed(Session 2) : %d\n", srv_session_info_killed(session_2));

  /* Close session 1 */
  WRITE_SEP();
  WRITE_STR("Closing Session 1\n");
  if (srv_session_close(session_1))
    WRITE_STR("Closing Session 1 failed as expected. It was already closed by EXEC_TEST_CMD\n");

  WRITE_SEP();
  WRITE_STR("Get/Set session info with closed session(Session 1)\n");
  WRITE_SEP();

  db_name= srv_session_info_get_current_db(session_1);

  WRITE_VAL("srv_session_info_get_thd             : %d\n", srv_session_info_get_thd(session_1));
  WRITE_VAL("srv_session_info_get_session_id      : %d\n", srv_session_info_get_session_id(session_1));
  WRITE_VAL("srv_session_info_set_client_port     : %d\n", srv_session_info_set_client_port(session_1, 11111));
  WRITE_VAL("srv_session_info_get_client_port     : %d\n", srv_session_info_get_client_port(session_1));
  WRITE_VAL("srv_session_info_get_current_db      : %s\n", db_name.str);
  WRITE_VAL("srv_session_info_set_connection_type : %d\n", srv_session_info_set_connection_type(session_1, VIO_TYPE_SHARED_MEMORY));
  WRITE_STR("\n");

  WRITE_SEP();
  EXEC_TEST_CMD_EX(session_1, "SELECT ID, USER, HOST, DB, COMMAND, INFO FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx, true);
  WRITE_SEP();
  WRITE_STR("Perform KILL QUERY and suicide (KILL CONNECTION) on Session 2\n");
  WRITE_SEP();
  my_snprintf(buffer_query, sizeof(buffer_query), "KILL QUERY %i /*session_2_id*/", session_2_id);
  WRITE_VAL("%s\n", buffer_query);
  cmd.com_query.query = buffer_query;
  cmd.com_query.length = strlen(buffer_query);

  int fail= command_service_run_command(session_2, COM_QUERY, &cmd, &my_charset_utf8_general_ci,
                                        &sql_cbs, CS_TEXT_REPRESENTATION, plugin_ctx);

  if (fail)
  {
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "run_statement code: %d\n", fail);
    delete plugin_ctx;
    DBUG_VOID_RETURN;
  }

  WRITE_VAL("srv_session_info_killed(Session 2) : %d\n", srv_session_info_killed(session_2));

  my_snprintf(buffer_query, sizeof(buffer_query), "KILL CONNECTION %i  /*session_2_id*/", session_2_id);
  WRITE_VAL("%s\n", buffer_query);
  cmd.com_query.query = buffer_query;
  cmd.com_query.length = strlen(buffer_query);

  fail= command_service_run_command(session_2, COM_QUERY, &cmd, &my_charset_utf8_general_ci,
                                    &sql_cbs, CS_TEXT_REPRESENTATION, plugin_ctx);

  if (fail)
  {
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "run_statement code: %d\n", fail);
    delete plugin_ctx;
    DBUG_VOID_RETURN;
  }

  WRITE_VAL("srv_session_info_killed(Session 2) : %d\n", srv_session_info_killed(session_2));

  db_name= srv_session_info_get_current_db(session_2);

  WRITE_SEP();
  WRITE_STR("Get/Set session info with killed session(Session 2)\n");
  WRITE_SEP();
  WRITE_VAL("srv_session_info_get_thd             : %d\n", (bool) srv_session_info_get_thd(session_2));
  WRITE_VAL("srv_session_info_get_session_id      : %d\n", srv_session_info_get_session_id(session_2));
  WRITE_VAL("srv_session_info_set_client_port     : %d\n", srv_session_info_set_client_port(session_2, 11111));
  WRITE_VAL("srv_session_info_get_client_port     : %d\n", srv_session_info_get_client_port(session_2));
  WRITE_VAL("srv_session_info_get_current_db      : %s\n", db_name.str);
  WRITE_VAL("srv_session_info_set_connection_type : %d\n", srv_session_info_set_connection_type(session_2, VIO_TYPE_SHARED_MEMORY));
  WRITE_STR("\n");

  session_3= srv_session_open(NULL,plugin_ctx);
  if (!session_3)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Opening Session 3 failed");
  else
  {
    switch_user(session_3, user_privileged);

    WRITE_SEP();
    WRITE_STR("Session 2 got killed but not closed, thus it will appear in the processlist as Killed\n");
    WRITE_SEP();
    EXEC_TEST_CMD(session_3, "/*Session 3*/SELECT ID, USER, HOST, DB, COMMAND, INFO FROM INFORMATION_SCHEMA.PROCESSLIST WHERE info LIKE 'PLUGIN%' ORDER BY id", p, plugin_ctx);

    WRITE_STR("Closing Session 2\n");
    if (srv_session_close(session_2))
      my_plugin_log_message(&p, MY_ERROR_LEVEL, "Closing Session 2 failed");

    WRITE_STR("Closing Session 3\n");
    if (srv_session_close(session_3))
      my_plugin_log_message(&p, MY_ERROR_LEVEL, "Closing Session 3 failed");
  }

  delete plugin_ctx;
  DBUG_VOID_RETURN;
}


struct test_thread_context
{
  my_thread_handle thread;
  void *p;
  bool thread_finished;
  void (*test_function)(void *);
};


static void* test_sql_threaded_wrapper(void *param)
{
  char buffer[STRING_BUFFER_SIZE];
  struct test_thread_context *context= (struct test_thread_context*) param;

  WRITE_SEP();
  WRITE_STR("init thread\n");
  if (srv_session_init_thread(context->p))
    my_plugin_log_message(&context->p, MY_ERROR_LEVEL, "srv_session_init_thread failed.");

  context->test_function(context->p);

  WRITE_STR("deinit thread\n");
  srv_session_deinit_thread();

  context->thread_finished= true;
  return NULL;
}


static void create_log_file(const char * log_name)
{
  char filename[FN_REFLEN];

  fn_format(filename, log_name, "", ".log",
            MY_REPLACE_EXT | MY_UNPACK_FILENAME);
  unlink(filename);
  outfile= my_open(filename, O_CREAT|O_RDWR, MYF(0));
}

#ifdef HAVE_PSI_INTERFACE
static PSI_thread_key key_thread_session_info = PSI_NOT_INSTRUMENTED;
static PSI_thread_info session_info_threads[] = {
  { &key_thread_session_info, "session_info", 0 }
};
#endif // HAVE_PSI_INTERFACE

static void test_in_spawned_thread(void *p, void (*test_function)(void *))
{
  my_thread_attr_t attr;          /* Thread attributes */
  my_thread_attr_init(&attr);
  (void) my_thread_attr_setdetachstate(&attr, MY_THREAD_CREATE_JOINABLE);

  struct test_thread_context context;

  context.p= p;
  context.thread_finished= false;
  context.test_function= test_function;

  /* now create the thread and call test_session within the thread. */
  if (mysql_thread_create(key_thread_session_info, &(context.thread), &attr, test_sql_threaded_wrapper, &context) != 0)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Could not create test session thread");
  else
    my_thread_join(&context.thread, NULL);
}

static int test_sql_service_plugin_init(void *p)
{
  char buffer[STRING_BUFFER_SIZE];
  DBUG_ENTER("test_sql_service_plugin_init");
  my_plugin_log_message(&p, MY_INFORMATION_LEVEL, "Installation.");

  create_log_file(log_filename);

#ifdef HAVE_PSI_INTERFACE
  const char * const category = "test_service_sql";

  mysql_thread_register(category, session_info_threads, array_elements(session_info_threads));
#endif // HAVE_PSI_INTERFACE

  WRITE_SEP();
  WRITE_STR("Test in a server thread\n");
  test_sql(p);

  /* Test in a new thread */
  WRITE_STR("Follows threaded run\n");
  test_in_spawned_thread(p, test_sql);

  my_close(outfile, MYF(0));

  DBUG_RETURN(0);
}


static int test_sql_service_plugin_deinit(void *p)
{
  DBUG_ENTER("test_sql_service_plugin_deinit");
  my_plugin_log_message(&p, MY_INFORMATION_LEVEL, "Uninstallation.");
  DBUG_RETURN(0);
}


struct st_mysql_daemon test_sql_service_plugin=
{ MYSQL_DAEMON_INTERFACE_VERSION };


/*
  Plugin library descriptor
*/

mysql_declare_plugin(test_daemon)
{
  MYSQL_DAEMON_PLUGIN,
  &test_sql_service_plugin,
  "test_session_info",
  "Pavan Naik, Andrey Hristov",
  "Test session information",
  PLUGIN_LICENSE_GPL,
  test_sql_service_plugin_init,   /* Plugin Init      */
  test_sql_service_plugin_deinit, /* Plugin Deinit    */
  0x0100,                         /* 1.0              */
  NULL,                           /* status variables */
  NULL,                           /* system variables */
  NULL,                           /* config options   */
  0,                              /* flags            */
}
mysql_declare_plugin_end;