test_sql_errors.cc

/* Copyright (c) 2015, 2017, 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 <fcntl.h>
#include <mysql/plugin.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#include "m_string.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_sys.h"                             // my_write, my_malloc
#include "mysql_com.h"
#include "sql_string.h" /* STRING_PSI_MEMORY_KEY */

static const char *log_filename= "test_sql_errors";

#define MAX_SESSIONS 128

#define STRING_BUFFER_SIZE 512

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

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

static File outfile;

static void WRITE_STR(const char *format)
{
  char buffer[STRING_BUFFER_SIZE];
  my_snprintf(buffer,sizeof(buffer),format);
  my_write(outfile,(uchar*)buffer,strlen(buffer),MYF(0));
}


template<typename T>
void WRITE_VAL(const char *format, T value)
{
  char buffer[STRING_BUFFER_SIZE];
  my_snprintf(buffer,sizeof(buffer),format,value);
  my_write(outfile,(uchar*)buffer,strlen(buffer),MYF(0));
}


template<typename T1, typename T2>
void WRITE_VAL(const char *format, T1 value1, T2 value2)
{
  char buffer[STRING_BUFFER_SIZE];
  my_snprintf(buffer,sizeof(buffer),format,value1,value2);
  my_write(outfile,(uchar*)buffer,strlen(buffer),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);
}


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;
  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++;

  strncpy(pctx->sql_str_value[row][col], "[NULL]", sizeof("[NULL]")-1);
  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 const char *fieldtype2str(enum enum_field_types type)
{
  switch (type) {
    case MYSQL_TYPE_BIT:         return "BIT";
    case MYSQL_TYPE_BLOB:        return "BLOB";
    case MYSQL_TYPE_DATE:        return "DATE";
    case MYSQL_TYPE_DATETIME:    return "DATETIME";
    case MYSQL_TYPE_NEWDECIMAL:  return "NEWDECIMAL";
    case MYSQL_TYPE_DECIMAL:     return "DECIMAL";
    case MYSQL_TYPE_DOUBLE:      return "DOUBLE";
    case MYSQL_TYPE_ENUM:        return "ENUM";
    case MYSQL_TYPE_FLOAT:       return "FLOAT";
    case MYSQL_TYPE_GEOMETRY:    return "GEOMETRY";
    case MYSQL_TYPE_INT24:       return "INT24";
    case MYSQL_TYPE_LONG:        return "LONG";
    case MYSQL_TYPE_LONGLONG:    return "LONGLONG";
    case MYSQL_TYPE_LONG_BLOB:   return "LONG_BLOB";
    case MYSQL_TYPE_MEDIUM_BLOB: return "MEDIUM_BLOB";
    case MYSQL_TYPE_NEWDATE:     return "NEWDATE";
    case MYSQL_TYPE_NULL:        return "NULL";
    case MYSQL_TYPE_SET:         return "SET";
    case MYSQL_TYPE_SHORT:       return "SHORT";
    case MYSQL_TYPE_STRING:      return "STRING";
    case MYSQL_TYPE_TIME:        return "TIME";
    case MYSQL_TYPE_TIMESTAMP:   return "TIMESTAMP";
    case MYSQL_TYPE_TINY:        return "TINY";
    case MYSQL_TYPE_TINY_BLOB:   return "TINY_BLOB";
    case MYSQL_TYPE_VARCHAR:     return "VARCHAR";
    case MYSQL_TYPE_VAR_STRING:  return "VAR_STRING";
    case MYSQL_TYPE_YEAR:        return "YEAR";
    default:                     return "?-unknown-?";
  }
}


static char *fieldflags2str(uint f)
{
  static char buf[1024];
  char *s=buf;
  *s=0;

  #define ff2s_check_flag(X)  if (f & X ## _FLAG) { s=my_stpcpy(s, # X " "); f &= ~ X ## _FLAG; }
  ff2s_check_flag(NOT_NULL);
  ff2s_check_flag(PRI_KEY);
  ff2s_check_flag(UNIQUE_KEY);
  ff2s_check_flag(MULTIPLE_KEY);
  ff2s_check_flag(BLOB);
  ff2s_check_flag(UNSIGNED);
  ff2s_check_flag(ZEROFILL);
  ff2s_check_flag(BINARY);
  ff2s_check_flag(ENUM);
  ff2s_check_flag(AUTO_INCREMENT);
  ff2s_check_flag(TIMESTAMP);
  ff2s_check_flag(SET);
  ff2s_check_flag(NO_DEFAULT_VALUE);
  ff2s_check_flag(NUM);
  ff2s_check_flag(PART_KEY);
  ff2s_check_flag(GROUP);
  ff2s_check_flag(UNIQUE);
  ff2s_check_flag(BINCMP);
  ff2s_check_flag(ON_UPDATE_NOW);
  #undef ff2s_check_flag
  if (f)
    sprintf(s, " unknown=0x%04x", f);
  return buf;
}


static void get_data_str(struct st_plugin_ctx *pctx)
{
  /* start metadata */
  WRITE_VAL("num_cols: %d\n", pctx->num_cols);
  WRITE_VAL("nb rows: %d\n", pctx->num_rows);

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

  for (uint col= 0; col < pctx->num_cols; col++)
  {
    WRITE_VAL("%s(%u) ", fieldtype2str(pctx->sql_field[col].type), pctx->sql_field[col].type);
  }
  WRITE_STR("\n");

  for (uint col= 0; col < pctx->num_cols; col++)
  {
    WRITE_VAL("(%s) ", fieldflags2str(pctx->sql_field[col].flags));
  }
  WRITE_STR("\n");

  WRITE_STR("Write a string\n");
  for (uint row= 0; row < pctx->num_rows; row++)
  {
    for (uint col= 0; col < pctx->num_cols; col++)
    {
      WRITE_VAL("%s  ", pctx->sql_str_value[row][col]);
    }
    WRITE_STR("\n");
  }
  WRITE_STR("\n");
}


static void handle_error(struct st_plugin_ctx *pctx)
{
  /* handle_ok/error */
  if (pctx->sql_errno)
  {
    WRITE_VAL("error     : %d\n",pctx->sql_errno);
    WRITE_VAL("error msg : %s\n",pctx->err_msg);
  }
  else
  {
    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);
  }
}


static void exec_test_cmd(MYSQL_SESSION session, const char *test_cmd, void *p, void * ctx)
{
  WRITE_VAL("%s\n",test_cmd);
  struct st_plugin_ctx *pctx= (struct st_plugin_ctx*) ctx;
  COM_DATA cmd;
  pctx->reset();
  cmd.com_query.query= (char *)test_cmd;
  cmd.com_query.length= strlen(cmd.com_query.query);
  int fail= command_service_run_command(session,COM_QUERY,&cmd, &my_charset_utf8_general_ci,
                                        &sql_cbs, CS_TEXT_REPRESENTATION, ctx);
  if (fail)
  {
    if (!srv_session_close(session))
      my_plugin_log_message(&p, MY_ERROR_LEVEL, "test_sql_2_sessions - ret code : %d", fail);
  }
  else
  {
    if (pctx->num_cols)
      get_data_str(pctx);
    handle_error(pctx);
  }
}


/* SQL (system) variable to control number of sessions                    */
/* Only effective at start od mysqld by setting it as option --loose-...  */
int nb_sessions;
static MYSQL_SYSVAR_INT  (nb_sessions, nb_sessions, PLUGIN_VAR_RQCMDARG,
                          "number of sessions", NULL, NULL, 1, 1, 500, 0);

static struct st_mysql_sys_var *test_services_sysvars[]=
{
  MYSQL_SYSVAR(nb_sessions),
  NULL
};


static void test_sql(void *p)
{
  DBUG_ENTER("test_sql");
  struct st_plugin_ctx *plugin_ctx= new st_plugin_ctx();

  /* Session declarations */
  MYSQL_SESSION session_1, session_2;

  /* 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, "Open session_1 failed.");
  else
    switch_user(session_1, user_privileged);

  /* Statement 1 */
  WRITE_SEP();
  WRITE_STR("Session 1 : \n");
  WRITE_SEP();
  exec_test_cmd(session_1, "SELECT * FROM test.t_int", p, plugin_ctx);

  /* Opening session 1 a second time 
  WRITE_STR("Opening Session 1 a second time\n");
  session_1= srv_session_open(NULL,plugin_ctx);
  switch_user(session_1, user_privileged);
  if (!session_1)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Open session_1 failed.");
*/
  /* Opening session 2 */
  WRITE_STR("\nOpening Session 2\n");
  session_2= srv_session_open(NULL,plugin_ctx);
  if (!session_2)
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Open session_2 failed.");
  else
    switch_user(session_2, user_privileged);

  /* Statement 2 */
  WRITE_SEP();
  WRITE_STR("Session 1 : \n");
  WRITE_SEP();
  exec_test_cmd(session_1, "SELECT * FROM test.t_bigint", p, plugin_ctx);

  /* Statement 3 */
  WRITE_SEP();
  WRITE_STR("Session 2 : \n");
  WRITE_SEP();
  exec_test_cmd(session_2, "SELECT * FROM test.t_real", p, plugin_ctx);

  /* Close session 1 */
  WRITE_STR("\nClose Session 1\n");
  if (srv_session_close(session_1))
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Close session_1 failed.");

  /* Statement 4 */
  WRITE_SEP();
  WRITE_STR("Session 2 : \n");
  WRITE_SEP();
  exec_test_cmd(session_2, "SELECT * FROM test.t_date", p, plugin_ctx);

  /* Statement 5 */
  WRITE_SEP();
  WRITE_STR("Session 1 (already closed): \n");
  WRITE_SEP();
  exec_test_cmd(session_1, "SELECT * FROM test.t_date", p, plugin_ctx);

  /* Close session 2 */
  WRITE_STR("\nClose Session 2\n");
  if (srv_session_close(session_2))
    my_plugin_log_message(&p, MY_ERROR_LEVEL, "Close session_2 failed.");

  /* Close session 2 */
  WRITE_STR("\nClose Session 2 again\n");
  srv_session_close(session_2);

  delete plugin_ctx;
  DBUG_VOID_RETURN;
}


static void test_session_only_open(void *p)
{
  DBUG_ENTER("test_session_only_open");

  MYSQL_SESSION sessions[MAX_SESSIONS];

/* Disabled open without close as these 5 sessions stay open until server shutdow, That
   violates the rules of a valid regression test. */
  /* Open sessions: Must pass */
  for (int i= 0; i < nb_sessions; i++)
  {
    WRITE_VAL("srv_session_open %d\n", i);
    sessions[i]= srv_session_open(NULL, NULL);
    if (!sessions[i])
    {
      my_plugin_log_message(&p, MY_ERROR_LEVEL, "srv_session_open_%d failed.", i);
    }
    else
    {
      my_plugin_log_message(&p, MY_INFORMATION_LEVEL, "Opened session %d .", i);
    }
  }

  DBUG_VOID_RETURN;
}


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

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));
}


static void* test_sql_threaded_wrapper(void *param)
{
  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 missing\n");
//  srv_session_deinit_thread();

  context->thread_finished= true;
  return NULL;
}


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 (my_thread_create(&(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_session_service_plugin_init(void *p)
{
  DBUG_ENTER("test_session_service_plugin_init");

  create_log_file(log_filename);

  my_plugin_log_message(&p, MY_INFORMATION_LEVEL, "Installation.");

  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);
  
/* Test of service: sessions */
  WRITE_STR("Test in a server thread without closing sessions\n");
  test_session_only_open(p);

  DBUG_RETURN(0);
}


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


struct st_mysql_daemon test_session_service_plugin=
{ MYSQL_DAEMON_INTERFACE_VERSION };


/*
  Plugin library descriptor
*/

mysql_declare_plugin(test_daemon)
{
  MYSQL_DAEMON_PLUGIN,
  &test_session_service_plugin,
  "test_sql_errors",
  "Horst Hunger, Andrey Hristov",
  "Test error cases",
  PLUGIN_LICENSE_GPL,
  test_session_service_plugin_init,   /* Plugin Init      */
  test_session_service_plugin_deinit, /* Plugin Deinit    */
  0x0100,                             /* 1.0              */
  NULL,                               /* status variables */
  test_services_sysvars,              /* system variables */
  NULL,                               /* config options   */
  0,                                  /* flags            */
}
mysql_declare_plugin_end;