~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2006 MySQL AB

   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 */

/* Copy data from a textfile to table */

#include <config.h>

#include <drizzled/sql_load.h>

#include <drizzled/error.h>

#include <drizzled/data_home.h>

#include <drizzled/session.h>

#include <drizzled/sql_base.h>

#include <drizzled/field/epoch.h>

#include <drizzled/internal/my_sys.h>

#include <drizzled/internal/iocache.h>

#include <drizzled/plugin/storage_engine.h>

#include <drizzled/sql_lex.h>

#include <drizzled/copy_info.h>

#include <drizzled/file_exchange.h>

#include <drizzled/util/test.h>

#include <drizzled/session/transactions.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <algorithm>

#include <climits>

#include <boost/filesystem.hpp>

namespace fs=boost::filesystem;

using namespace std;

namespace drizzled

{

class READ_INFO {

  int	cursor;

  unsigned char	*buffer;                /* Buffer for read text */

  unsigned char *end_of_buff;           /* Data in bufferts ends here */

  size_t buff_length;                   /* Length of buffert */

  size_t max_length;                    /* Max length of row */

  char	*field_term_ptr,*line_term_ptr,*line_start_ptr,*line_start_end;

  uint	field_term_length,line_term_length,enclosed_length;

  int	field_term_char,line_term_char,enclosed_char,escape_char;

  int	*stack,*stack_pos;

  bool	found_end_of_line,start_of_line,eof;

  bool  need_end_io_cache;

  internal::io_cache_st cache;

public:

  bool error,line_cuted,found_null,enclosed;

  unsigned char	*row_start,			/* Found row starts here */

	*row_end;			/* Found row ends here */

  const charset_info_st *read_charset;

  READ_INFO(int cursor, size_t tot_length, const charset_info_st * const cs,

	    String &field_term,String &line_start,String &line_term,

	    String &enclosed,int escape, bool is_fifo);

  ~READ_INFO();

  int read_field();

  int read_fixed_length(void);

  int next_line(void);

  char unescape(char chr);

  int terminator(char *ptr,uint32_t length);

  bool find_start_of_fields();

  /*

    We need to force cache close before destructor is invoked to log

    the last read block

  */

  void end_io_cache()

  {

    cache.end_io_cache();

    need_end_io_cache = 0;

  }

  /*

    Either this method, or we need to make cache public

    Arg must be set from load() since constructor does not see

    either the table or Session value

  */

  void set_io_cache_arg(void* arg) { cache.arg = arg; }

};

static int read_fixed_length(Session *session, CopyInfo &info, TableList *table_list,

                             List<Item> &fields_vars, List<Item> &set_fields,

                             List<Item> &set_values, READ_INFO &read_info,

			     uint32_t skip_lines,

			     bool ignore_check_option_errors);

static int read_sep_field(Session *session, CopyInfo &info, TableList *table_list,

                          List<Item> &fields_vars, List<Item> &set_fields,

                          List<Item> &set_values, READ_INFO &read_info,

			  String &enclosed, uint32_t skip_lines,

			  bool ignore_check_option_errors);

/*

  Execute LOAD DATA query

  SYNOPSYS

    load()

      session - current thread

      ex  - file_exchange object representing source cursor and its parsing rules

      table_list  - list of tables to which we are loading data

      fields_vars - list of fields and variables to which we read

                    data from cursor

      set_fields  - list of fields mentioned in set clause

      set_values  - expressions to assign to fields in previous list

      handle_duplicates - indicates whenever we should emit error or

                          replace row if we will meet duplicates.

      ignore -          - indicates whenever we should ignore duplicates

  RETURN VALUES

    true - error / false - success

*/

int load(Session *session,file_exchange *ex,TableList *table_list,

	        List<Item> &fields_vars, List<Item> &set_fields,

                List<Item> &set_values,

                enum enum_duplicates handle_duplicates, bool ignore)

{

  int file;

  Table *table= NULL;

  int error;

  String *field_term=ex->field_term,*escaped=ex->escaped;

  String *enclosed=ex->enclosed;

  bool is_fifo=0;

  assert(table_list->getSchemaName()); // This should never be null

  /*

    If path for cursor is not defined, we will use the current database.

    If this is not set, we will use the directory where the table to be

    loaded is located

  */

  util::string::ptr schema(session->schema());

  const char *tdb= (schema and not schema->empty()) ? schema->c_str() : table_list->getSchemaName(); // Result should never be null

  assert(tdb);

  uint32_t skip_lines= ex->skip_lines;

  bool transactional_table;

  /* Escape and enclosed character may be a utf8 4-byte character */

  if (escaped->length() > 4 || enclosed->length() > 4)

  {

    my_error(ER_WRONG_FIELD_TERMINATORS,MYF(0),enclosed->c_ptr(), enclosed->length());

    return true;

  }

  if (session->openTablesLock(table_list))

    return true;

  if (setup_tables_and_check_access(session, &session->lex().select_lex.context,

                                    &session->lex().select_lex.top_join_list,

                                    table_list,

                                    &session->lex().select_lex.leaf_tables, true))

     return(-1);

  /*

    Let us emit an error if we are loading data to table which is used

    in subselect in SET clause like we do it for INSERT.

    The main thing to fix to remove this restriction is to ensure that the

    table is marked to be 'used for insert' in which case we should never

    mark this table as 'const table' (ie, one that has only one row).

  */

  if (unique_table(table_list, table_list->next_global))

  {

    my_error(ER_UPDATE_TABLE_USED, MYF(0), table_list->getTableName());

    return true;

  }

  table= table_list->table;

  transactional_table= table->cursor->has_transactions();

  if (!fields_vars.size())

  {

    Field **field;

    for (field= table->getFields(); *field ; field++)

      fields_vars.push_back(new Item_field(*field));

    table->setWriteSet();

    table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;

    /*

      Let us also prepare SET clause, altough it is probably empty

      in this case.

    */

    if (setup_fields(session, 0, set_fields, MARK_COLUMNS_WRITE, 0, 0) ||

        setup_fields(session, 0, set_values, MARK_COLUMNS_READ, 0, 0))

      return true;

  }

  else

  {						// Part field list

    /* TODO: use this conds for 'WITH CHECK OPTIONS' */

    if (setup_fields(session, 0, fields_vars, MARK_COLUMNS_WRITE, 0, 0) ||

        setup_fields(session, 0, set_fields, MARK_COLUMNS_WRITE, 0, 0) ||

        check_that_all_fields_are_given_values(session, table, table_list))

      return true;

    /*

      Check whenever TIMESTAMP field with auto-set feature specified

      explicitly.

    */

    if (table->timestamp_field)

    {

      if (table->isWriteSet(table->timestamp_field->position()))

      {

        table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;

      }

      else

      {

        table->setWriteSet(table->timestamp_field->position());

      }

    }

    /* Fix the expressions in SET clause */

    if (setup_fields(session, 0, set_values, MARK_COLUMNS_READ, 0, 0))

      return true;

  }

  table->mark_columns_needed_for_insert();

  size_t tot_length=0;

  bool use_blobs= 0, use_vars= 0;

  List<Item>::iterator it(fields_vars.begin());

  Item *item;

  while ((item= it++))

  {

    Item *real_item= item->real_item();

    if (real_item->type() == Item::FIELD_ITEM)

    {

      Field *field= ((Item_field*)real_item)->field;

      if (field->flags & BLOB_FLAG)

      {

        use_blobs= 1;

        tot_length+= 256;			// Will be extended if needed

      }

      else

        tot_length+= field->field_length;

    }

    else if (item->type() == Item::STRING_ITEM)

      use_vars= 1;

  }

  if (use_blobs && !ex->line_term->length() && !field_term->length())

  {

    my_message(ER_BLOBS_AND_NO_TERMINATED,ER(ER_BLOBS_AND_NO_TERMINATED),

	       MYF(0));

    return true;

  }

  if (use_vars && !field_term->length() && !enclosed->length())

  {

    my_error(ER_LOAD_FROM_FIXED_SIZE_ROWS_TO_VAR, MYF(0));

    return true;

  }

  fs::path to_file(ex->file_name);

  fs::path target_path(fs::system_complete(getDataHomeCatalog()));

  if (not to_file.has_root_directory())

  {

    int count_elements= 0;

    for (fs::path::iterator iter= to_file.begin();

         iter != to_file.end();

         ++iter, ++count_elements)

    { }

    if (count_elements == 1)

    {

      target_path /= tdb;

    }

    target_path /= to_file;

  }

  else

  {

    target_path= to_file;

  }

  if (not secure_file_priv.string().empty())

  {

    if (target_path.file_string().substr(0, secure_file_priv.file_string().size()) != secure_file_priv.file_string())

    {

      /* Read only allowed from within dir specified by secure_file_priv */

      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");

      return true;

    }

  }

  struct stat stat_info;

  if (stat(target_path.file_string().c_str(), &stat_info))

  {

    my_error(ER_FILE_NOT_FOUND, MYF(0), target_path.file_string().c_str(), errno);

    return true;

  }

  // if we are not in slave thread, the cursor must be:

  if (!((stat_info.st_mode & S_IROTH) == S_IROTH &&  // readable by others

        (stat_info.st_mode & S_IFLNK) != S_IFLNK && // and not a symlink

        ((stat_info.st_mode & S_IFREG) == S_IFREG ||

         (stat_info.st_mode & S_IFIFO) == S_IFIFO)))

  {

    my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), target_path.file_string().c_str());

    return true;

  }

  if ((stat_info.st_mode & S_IFIFO) == S_IFIFO)

    is_fifo = 1;

  if ((file=internal::my_open(target_path.file_string().c_str(), O_RDONLY,MYF(MY_WME))) < 0)

  {

    my_error(ER_CANT_OPEN_FILE, MYF(0), target_path.file_string().c_str(), errno);

    return true;

  }

  CopyInfo info;

  memset(&info, 0, sizeof(info));

  info.ignore= ignore;

  info.handle_duplicates=handle_duplicates;

  info.escape_char=escaped->length() ? (*escaped)[0] : INT_MAX;

  identifier::Schema identifier(*schema);

  READ_INFO read_info(file, tot_length,

                      ex->cs ? ex->cs : plugin::StorageEngine::getSchemaCollation(identifier),

		      *field_term, *ex->line_start, *ex->line_term, *enclosed,

		      info.escape_char, is_fifo);

  if (read_info.error)

  {

    if	(file >= 0)

      internal::my_close(file,MYF(0));			// no files in net reading

    return true;				// Can't allocate buffers

  }

  /*

   * Per the SQL standard, inserting NULL into a NOT NULL

   * field requires an error to be thrown.

   *

   * @NOTE

   *

   * NULL check and handling occurs in field_conv.cc

   */

  session->count_cuted_fields= CHECK_FIELD_ERROR_FOR_NULL;

  session->cuted_fields=0L;

  /* Skip lines if there is a line terminator */

  if (ex->line_term->length())

  {

    /* ex->skip_lines needs to be preserved for logging */

    while (skip_lines > 0)

    {

      skip_lines--;

      if (read_info.next_line())

	break;

    }

  }

  if (!(error=test(read_info.error)))

  {

    table->next_number_field=table->found_next_number_field;

    if (ignore ||

	handle_duplicates == DUP_REPLACE)

      table->cursor->extra(HA_EXTRA_IGNORE_DUP_KEY);

    if (handle_duplicates == DUP_REPLACE)

        table->cursor->extra(HA_EXTRA_WRITE_CAN_REPLACE);

    table->cursor->ha_start_bulk_insert((ha_rows) 0);

    table->copy_blobs=1;

    session->setAbortOnWarning(true);

    if (!field_term->length() && !enclosed->length())

      error= read_fixed_length(session, info, table_list, fields_vars,

                               set_fields, set_values, read_info,

			       skip_lines, ignore);

    else

      error= read_sep_field(session, info, table_list, fields_vars,

                            set_fields, set_values, read_info,

			    *enclosed, skip_lines, ignore);

    if (table->cursor->ha_end_bulk_insert() && !error)

    {

      table->print_error(errno, MYF(0));

      error= 1;

    }

    table->cursor->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);

    table->cursor->extra(HA_EXTRA_WRITE_CANNOT_REPLACE);

    table->next_number_field=0;

  }

  if (file >= 0)

    internal::my_close(file,MYF(0));

  free_blobs(table);				/* if pack_blob was used */

  table->copy_blobs=0;

  session->count_cuted_fields= CHECK_FIELD_ERROR_FOR_NULL;

  /*

     simulated killing in the middle of per-row loop

     must be effective for binlogging

  */

  if (error) 

  {

    error= -1;				// Error on read

    goto err;

  }

  char msg[FN_REFLEN];

  snprintf(msg, sizeof(msg), ER(ER_LOAD_INFO), info.records, info.deleted,

	   (info.records - info.copied), session->cuted_fields);

  if (session->transaction.stmt.hasModifiedNonTransData())

    session->transaction.all.markModifiedNonTransData();

  /* ok to client sent only after binlog write and engine commit */

  session->my_ok(info.copied + info.deleted, 0, 0L, msg);

err:

  assert(transactional_table || !(info.copied || info.deleted) ||

              session->transaction.stmt.hasModifiedNonTransData());

  table->cursor->ha_release_auto_increment();

  table->auto_increment_field_not_null= false;

  session->setAbortOnWarning(false);

  return(error);

}

/****************************************************************************

** Read of rows of fixed size + optional garage + optonal newline

****************************************************************************/

static int

read_fixed_length(Session *session, CopyInfo &info, TableList *table_list,

                  List<Item> &fields_vars, List<Item> &set_fields,

                  List<Item> &set_values, READ_INFO &read_info,

                  uint32_t skip_lines, bool ignore_check_option_errors)

{

  List<Item>::iterator it(fields_vars.begin());

  Item_field *sql_field;

  Table *table= table_list->table;

  bool err;

  while (!read_info.read_fixed_length())

  {

    if (session->getKilled())

    {

      session->send_kill_message();

      return 1;

    }

    if (skip_lines)

    {

      /*

	We could implement this with a simple seek if:

	- We are not using DATA INFILE LOCAL

	- escape character is  ""

	- line starting prefix is ""

      */

      skip_lines--;

      continue;

    }

    it= fields_vars.begin();

    unsigned char *pos=read_info.row_start;

#ifdef HAVE_VALGRIND

    read_info.row_end[0]=0;

#endif

    table->restoreRecordAsDefault();

    /*

      There is no variables in fields_vars list in this format so

      this conversion is safe.

    */

    while ((sql_field= (Item_field*) it++))

    {

      Field *field= sql_field->field;

      if (field == table->next_number_field)

        table->auto_increment_field_not_null= true;

      /*

        No fields specified in fields_vars list can be null in this format.

        Mark field as not null, we should do this for each row because of

        restore_record...

      */

      field->set_notnull();

      if (pos == read_info.row_end)

      {

        session->cuted_fields++;			/* Not enough fields */

        push_warning_printf(session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

                            ER_WARN_TOO_FEW_RECORDS,

                            ER(ER_WARN_TOO_FEW_RECORDS), session->row_count);

        if (not field->maybe_null() and field->is_timestamp())

            ((field::Epoch::pointer) field)->set_time();

      }

      else

      {

	uint32_t length;

	unsigned char save_chr;

	if ((length=(uint32_t) (read_info.row_end-pos)) >

	    field->field_length)

        {

	  length=field->field_length;

        }

	save_chr=pos[length];

        pos[length]='\0'; // Add temp null terminator for store()

        field->store((char*) pos,length,read_info.read_charset);

	pos[length]=save_chr;

	if ((pos+=length) > read_info.row_end)

	  pos= read_info.row_end;	/* Fills rest with space */

      }

    }

    if (pos != read_info.row_end)

    {

      session->cuted_fields++;			/* To long row */

      push_warning_printf(session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

                          ER_WARN_TOO_MANY_RECORDS,

                          ER(ER_WARN_TOO_MANY_RECORDS), session->row_count);

    }

    if (session->getKilled() ||

        fill_record(session, set_fields, set_values,

                    ignore_check_option_errors))

      return 1;

    err= write_record(session, table, &info);

    table->auto_increment_field_not_null= false;

    if (err)

      return 1;

    /*

      We don't need to reset auto-increment field since we are restoring

      its default value at the beginning of each loop iteration.

    */

    if (read_info.next_line())			// Skip to next line

      break;

    if (read_info.line_cuted)

    {

      session->cuted_fields++;			/* To long row */

      push_warning_printf(session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

                          ER_WARN_TOO_MANY_RECORDS,

                          ER(ER_WARN_TOO_MANY_RECORDS), session->row_count);

    }

    session->row_count++;

  }

  return(test(read_info.error));

}

static int

read_sep_field(Session *session, CopyInfo &info, TableList *table_list,

               List<Item> &fields_vars, List<Item> &set_fields,

               List<Item> &set_values, READ_INFO &read_info,

	       String &enclosed, uint32_t skip_lines,

	       bool ignore_check_option_errors)

{

  List<Item>::iterator it(fields_vars.begin());

  Item *item;

  Table *table= table_list->table;

  uint32_t enclosed_length;

  bool err;

  enclosed_length=enclosed.length();

  for (;;it= fields_vars.begin())

  {

    if (session->getKilled())

    {

      session->send_kill_message();

      return 1;

    }

    table->restoreRecordAsDefault();

    while ((item= it++))

    {

      uint32_t length;

      unsigned char *pos;

      Item *real_item;

      if (read_info.read_field())

	break;

      /* If this line is to be skipped we don't want to fill field or var */

      if (skip_lines)

        continue;

      pos=read_info.row_start;

      length=(uint32_t) (read_info.row_end-pos);

      real_item= item->real_item();

      if ((!read_info.enclosed && (enclosed_length && length == 4 && !memcmp(pos, STRING_WITH_LEN("NULL")))) ||

	  (length == 1 && read_info.found_null))

      {

        if (real_item->type() == Item::FIELD_ITEM)

        {

          Field *field= ((Item_field *)real_item)->field;

          if (field->reset())

          {

            my_error(ER_WARN_NULL_TO_NOTNULL, MYF(0), field->field_name,

                     session->row_count);

            return 1;

          }

          field->set_null();

          if (not field->maybe_null())

          {

            if (field->is_timestamp())

            {

              ((field::Epoch::pointer) field)->set_time();

            }

            else if (field != table->next_number_field)

            {

              field->set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_NULL_TO_NOTNULL, 1);

            }

          }

	}

        else if (item->type() == Item::STRING_ITEM)

        {

          ((Item_user_var_as_out_param *)item)->set_null_value(

                                                  read_info.read_charset);

        }

        else

        {

          my_error(ER_LOAD_DATA_INVALID_COLUMN, MYF(0), item->full_name());

          return 1;

        }

	continue;

      }