Class: Amalgalite::Requires::Bootstrap

Inherits:
Object
  • Object
show all
Defined in:
ext/amalgalite/c/amalgalite_requires_bootstrap.c

Defined Under Namespace

Classes: Error

Constant Summary collapse

DEFAULT_DB =

constants for default db, table, column, rowid, contents

rb_str_new2( "lib.db" )
DEFAULT_TABLE = 
rb_str_new2( "rubylibs" )
DEFAULT_BOOTSTRAP_TABLE = 
rb_str_new2( "bootstrap" )
DEFAULT_ROWID_COLUMN = 
rb_str_new2( "id" )
DEFAULT_FILENAME_COLUMN = 
rb_str_new2( "filename" )
DEFAULT_CONTENTS_COLUMN = 
rb_str_new2( "contents" )
DEFAULT_COMPRESSED_COLUMN = 
rb_str_new2( "compressed" )

Class Method Summary collapse

Class Method Details

.Amalgalite::Requires::Bootstrap.lift('dbfile') ⇒ Object

WARNING WARNING WARNING WARNING WARNING WARNING WARNING

This is a boostrap mechanism to eval all the code in a particular column in a specially formatted table in an sqlite database. It should only be used for a specific purpose, mainly loading the Amalgalite ruby code directly from an sqlite table.

Amalgalite::Requires adds in the ability to require code that is in an sqlite database. Since Amalgalite::Requires is itself ruby code, if Amalgalite::Requires was in an sqlite database, it could not require itself. Therefore this method is made available. It is a pure C extension method that directly calls the sqlite3 C functions directly and uses the ruby C api to eval the data in the table.

This method attaches to an sqlite3 database (filename) and then does:

  SELECT filename_column_name, content_column_name
    FROM table_name
ORDER BY rowid_column_name

For each row returned it does an eval on the code in the content_column_name and then updates _$LOADED_FEATURES_ directly with the value from filename_column_name.

The database to be opened by lift must be an sqlite3 UTF-8 database.



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# File 'ext/amalgalite/c/amalgalite_requires_bootstrap.c', line 155

VALUE am_bootstrap_lift( VALUE self, VALUE args )
{
    sqlite3 *db = NULL;
    int      rc;
    char     raise_msg[BUFSIZ];
    VALUE    tmp = Qnil;

    VALUE    am_db_c  = rb_const_get( cARB, rb_intern("DEFAULT_DB") );

    char    *dbfile = NULL;


    if (   Qnil == args  ) {
        args = rb_hash_new();
    } else {
        args = rb_ary_shift( args );
    }

    Check_Type( args, T_HASH );
    
    /* get the arguments */
    dbfile      = ( Qnil == (tmp = rb_hash_aref( args, rb_str_new2( "dbfile"          ) ) ) ) ? StringValuePtr( am_db_c )      : StringValuePtr( tmp );

    /* open the database */
    rc = sqlite3_open_v2( dbfile , &db, SQLITE_OPEN_READONLY, NULL);
    if ( SQLITE_OK != rc ) {
        memset( raise_msg, 0, BUFSIZ );
        snprintf(raise_msg, BUFSIZ, "Failure to open database %s for bootload: [SQLITE_ERROR %d] : %s", dbfile, rc, sqlite3_errmsg( db ) );
        am_bootstrap_cleanup_and_raise( raise_msg, db, NULL );
    }

    am_bootstrap_from_db( db, args );

    /* close the database */
    rc = sqlite3_close( db );
    if ( SQLITE_OK != rc ) {
        memset( raise_msg, 0, BUFSIZ );
        snprintf( raise_msg, BUFSIZ, "Failure to close database : [SQLITE_ERROR %d] : %s\n", rc, sqlite3_errmsg( db )),
        am_bootstrap_cleanup_and_raise( raise_msg, db, NULL );
    }

    return Qnil;
}

.Amalgalite::Requires::Bootstrap.lift('dbfile') ⇒ Object

WARNING WARNING WARNING WARNING WARNING WARNING WARNING

This is a boostrap mechanism to eval all the code in a particular column in a specially formatted table in an sqlite database. It should only be used for a specific purpose, mainly loading the Amalgalite ruby code directly from an sqlite table.

Amalgalite::Requires adds in the ability to require code that is in an sqlite database. Since Amalgalite::Requires is itself ruby code, if Amalgalite::Requires was in an sqlite database, it could not require itself. Therefore this method is made available. It is a pure C extension method that directly calls the sqlite3 C functions directly and uses the ruby C api to eval the data in the table.

This method attaches to an sqlite3 database (filename) and then does:

  SELECT filename_column_name, content_column_name
    FROM table_name
ORDER BY rowid_column_name

For each row returned it does an eval on the code in the content_column_name and then updates _$LOADED_FEATURES_ directly with the value from filename_column_name.

The database to be opened by lift must be an sqlite3 UTF-8 database.



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# File 'ext/amalgalite/c/amalgalite_requires_bootstrap.c', line 155

VALUE am_bootstrap_lift( VALUE self, VALUE args )
{
    sqlite3 *db = NULL;
    int      rc;
    char     raise_msg[BUFSIZ];
    VALUE    tmp = Qnil;

    VALUE    am_db_c  = rb_const_get( cARB, rb_intern("DEFAULT_DB") );

    char    *dbfile = NULL;


    if (   Qnil == args  ) {
        args = rb_hash_new();
    } else {
        args = rb_ary_shift( args );
    }

    Check_Type( args, T_HASH );
    
    /* get the arguments */
    dbfile      = ( Qnil == (tmp = rb_hash_aref( args, rb_str_new2( "dbfile"          ) ) ) ) ? StringValuePtr( am_db_c )      : StringValuePtr( tmp );

    /* open the database */
    rc = sqlite3_open_v2( dbfile , &db, SQLITE_OPEN_READONLY, NULL);
    if ( SQLITE_OK != rc ) {
        memset( raise_msg, 0, BUFSIZ );
        snprintf(raise_msg, BUFSIZ, "Failure to open database %s for bootload: [SQLITE_ERROR %d] : %s", dbfile, rc, sqlite3_errmsg( db ) );
        am_bootstrap_cleanup_and_raise( raise_msg, db, NULL );
    }

    am_bootstrap_from_db( db, args );

    /* close the database */
    rc = sqlite3_close( db );
    if ( SQLITE_OK != rc ) {
        memset( raise_msg, 0, BUFSIZ );
        snprintf( raise_msg, BUFSIZ, "Failure to close database : [SQLITE_ERROR %d] : %s\n", rc, sqlite3_errmsg( db )),
        am_bootstrap_cleanup_and_raise( raise_msg, db, NULL );
    }

    return Qnil;
}