729 lines
15 KiB
C
729 lines
15 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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/* This class handles all journaling. All journaled objects must
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inherit from Loggable as well as define a few special methods (via
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macros), get and set methods, and have contructors and destructors
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that call log_create() and log_destroy() in the appropriate
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order. Any action that might affect multiple loggable objects
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*must* be braced by calls to Loggable::block_start() and
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Loggable::block_end() in order for Undo to work properly. */
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#include "Loggable.H"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "util/file.h"
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#include "const.h"
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#include "util/debug.h"
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#include <algorithm>
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using std::min;
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using std::max;
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FILE *Loggable::_fp;
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unsigned int Loggable::_log_id = 0;
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int Loggable::_level = 0;
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off_t Loggable::_undo_offset = 0;
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std::map <unsigned int, Loggable *> Loggable::_loggables;
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std::map <unsigned int, Log_Entry *> Loggable::_loggables_unjournaled;
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std::map <std::string, create_func*> Loggable::_class_map;
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std::queue <char *> Loggable::_transaction;
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progress_func *Loggable::_progress_callback = NULL;
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void *Loggable::_progress_callback_arg = NULL;
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snapshot_func *Loggable::_snapshot_callback = NULL;
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void *Loggable::_snapshot_callback_arg = NULL;
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Loggable::~Loggable ( )
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{
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_loggables[ _id ] = NULL;
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}
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void
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Loggable::block_start ( void )
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{
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++Loggable::_level;
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}
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void
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Loggable::block_end ( void )
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{
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--Loggable::_level;
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ASSERT( Loggable::_level >= 0, "Programming error" );
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if ( Loggable::_level == 0 )
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flush();
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}
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Loggable *
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Loggable::find ( unsigned int id )
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{
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return _loggables[ id ];
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}
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/** Open the journal /filename/ and replay it, bringing the end state back into RAM */
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bool
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Loggable::open ( const char *filename )
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{
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FILE *fp;
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Loggable::_fp = NULL;
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if ( ! ( fp = fopen( filename, "a+" ) ) )
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{
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WARNING( "Could not open log file for writing!" );
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return false;
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}
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load_unjournaled_state();
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if ( newer( "snapshot", filename ) )
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{
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MESSAGE( "Loading snapshot" );
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FILE *fp = fopen( "snapshot", "r" );
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replay( fp );
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fclose( fp );
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}
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else
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{
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MESSAGE( "Replaying journal" );
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replay( fp );
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}
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fseek( fp, 0, SEEK_END );
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_undo_offset = ftell( fp );
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Loggable::_fp = fp;
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return true;
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}
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bool
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Loggable::load_unjournaled_state ( void )
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{
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FILE *fp;
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fp = fopen( "unjournaled", "r" );
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if ( ! fp )
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{
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DWARNING( "Could not open unjournaled state file for reading" );
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return false;
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}
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unsigned int id;
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char buf[BUFSIZ];
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while ( fscanf( fp, "%X set %[^\n]\n", &id, buf ) == 2 )
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_loggables_unjournaled[ id ] = new Log_Entry( buf );
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fclose( fp );
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return true;
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}
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#include <sys/stat.h>
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#include <unistd.h>
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/** replay journal or snapshot */
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bool
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Loggable::replay ( FILE *fp )
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{
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/* FIXME: bogus */
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char buf[BUFSIZ];
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struct stat st;
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fstat( fileno( fp ), &st );
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off_t total = st.st_size;
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off_t current = 0;
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if ( _progress_callback )
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_progress_callback( 0, _progress_callback_arg );
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while ( fscanf( fp, "%[^\n]\n", buf ) == 1 )
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{
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if ( ! ( ! strcmp( buf, "{" ) || ! strcmp( buf, "}" ) ) )
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{
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if ( *buf == '\t' )
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do_this( buf + 1, false );
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else
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do_this( buf, false );
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}
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current = ftell( fp );
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if ( _progress_callback )
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_progress_callback( current * 100 / total, _progress_callback_arg );
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}
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if ( _progress_callback )
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_progress_callback( 0, _progress_callback_arg );
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return true;
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}
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/** close journal and delete all loggable objects, returing the systemt to a blank slate */
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bool
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Loggable::close ( void )
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{
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DMESSAGE( "closing journal and destroying all journaled objects" );
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if ( ! _fp )
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return true;
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fclose( _fp );
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_fp = NULL;
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if ( ! snapshot( "snapshot" ) )
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WARNING( "Failed to create snapshot" );
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for ( std::map <unsigned int, Loggable *>::iterator i = _loggables.begin();
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i != _loggables.end(); ++i )
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{
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if ( i->second )
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{
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delete i->second;
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}
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}
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save_unjournaled_state();
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return true;
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}
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/** save out unjournaled state for all loggables */
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bool
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Loggable::save_unjournaled_state ( void )
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{
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FILE *fp;
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fp = fopen( "unjournaled", "w" );
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if ( ! fp )
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{
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DWARNING( "Could not open unjournaled state file for writing!" );
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return false;
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}
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for ( std::map <unsigned int, Log_Entry *>::iterator i = _loggables_unjournaled.begin();
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i != _loggables_unjournaled.end(); ++i )
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{
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if ( i->second )
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{
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char *s = i->second->print();
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fprintf( fp, "0x%X set %s\n", i->first, s );
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free( s );
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}
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}
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fclose( fp );
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return true;
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}
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/** must be called after construction in create() methods */
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void
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Loggable::update_id ( unsigned int id )
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{
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/* make sure we're the last one */
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assert( _id == _log_id );
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assert( _loggables[ _id ] == this );
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_loggables[ _id ] = NULL;
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_log_id = max( _log_id, id );
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/* return this id number to the system */
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// --_log_id;
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_id = id;
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if ( _loggables[ _id ] )
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FATAL( "Attempt to create object with an ID (0x%X) that already exists. The existing object is of type \"%s\", the new one is \"%s\". Corrupt journal?", _id, _loggables[ _id ]->class_name(), class_name() );
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_loggables[ _id ] = this;
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}
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/** return a pointer to a static copy of /s/ with all special characters escaped */
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const char *
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Loggable::escape ( const char *s )
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{
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static char r[512];
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size_t i = 0;
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for ( ; *s && i < sizeof( r ); ++i, ++s )
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{
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if ( '\n' == *s )
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{
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r[ i++ ] = '\\';
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r[ i ] = 'n';
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}
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else if ( '"' == *s )
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{
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r[ i++ ] = '\\';
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r[ i ] = '"';
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}
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else
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r[ i ] = *s;
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}
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r[ i ] = '\0';
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return r;
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}
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/** 'do' a message like "Audio_Region 0xF1 set :r 123" */
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bool
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Loggable::do_this ( const char *s, bool reverse )
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{
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unsigned int id = 0;
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if ( ! ( sscanf( s, "%*s %X ", &id ) > 0 ) )
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return false;
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Loggable *l = find( id );
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// assert( l );
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char classname[40];
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char command[40];
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char *arguments = NULL;
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const char *create, *destroy;
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if ( reverse )
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{
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// sscanf( s, "%s %*X %s %*[^\n<]<< %a[^\n]", classname, command, &arguments );
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sscanf( s, "%s %*X %s%*[^\n<]<< %a[^\n]", classname, command, &arguments );
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create = "destroy";
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destroy = "create";
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DMESSAGE( "undoing \"%s\"", s );
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}
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else
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{
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sscanf( s, "%s %*X %s %a[^\n<]", classname, command, &arguments );
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create = "create";
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destroy = "destroy";
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}
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if ( ! strcmp( command, destroy ) )
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{
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/* deleting eg. a track, which contains a list of other
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widgets, causes destroy messages to be emitted for all those
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widgets, but when replaying the journal the destroy message
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causes the children to be deleted also... This is a temporary
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hack. Would it be better to queue up objects for deletion
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(when?) */
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if ( l )
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delete l;
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}
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else if ( ! strcmp( command, "set" ) )
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{
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// printf( "got set command (%s).\n", arguments );
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Log_Entry e( arguments );
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l->log_start();
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l->set( e );
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l->log_end();
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}
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else if ( ! strcmp( command, create ) )
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{
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Log_Entry e( arguments );
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ASSERT( _class_map[ std::string( classname ) ], "Journal contains an object of class \"%s\", but I don't know how to create such objects.", classname );
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{
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/* create */
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Loggable *l = _class_map[ std::string( classname ) ]( e, id );
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l->log_create();
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/* we're now creating a loggable. Apply any unjournaled
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* state it may have had in the past under this log ID */
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Log_Entry *e = _loggables_unjournaled[ id ];
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if ( e )
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l->set( *e );
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}
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}
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if ( arguments )
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free( arguments );
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return true;
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}
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/** Reverse the last journal transaction */
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void
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Loggable::undo ( void )
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{
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const int bufsiz = 1024;
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char buf[bufsiz];
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block_start();
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long here = ftell( _fp );
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fseek( _fp, _undo_offset, SEEK_SET );
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backwards_fgets( buf, bufsiz, _fp );
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if ( ! strcmp( buf, "}\n" ) )
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{
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DMESSAGE( "undoing block" );
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for ( ;; )
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{
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backwards_fgets( buf, bufsiz, _fp );
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char *s = buf;
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if ( *s != '\t' )
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break;
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else
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++s;
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do_this( s, true );
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}
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}
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else
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do_this( buf, true );
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off_t uo = ftell( _fp );
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ASSERT( _undo_offset <= here, "WTF?" );
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block_end();
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_undo_offset = uo;
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}
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/** write a snapshot of the current state of all loggable objects to
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* file handle /fp/ */
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bool
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Loggable::snapshot ( FILE *fp )
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{
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FILE *ofp = _fp;
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if ( ! Loggable::_snapshot_callback )
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{
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DWARNING( "No snapshot callback defined" );
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return false;
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}
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if ( ! ( _fp = fp ) )
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{
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_fp = ofp;
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return false;
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}
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block_start();
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Loggable::_snapshot_callback( _snapshot_callback_arg );
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block_end();
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_fp = ofp;
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return true;
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}
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/** write a snapshot of the current state of all loggable objects to
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* file /name/ */
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bool
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Loggable::snapshot ( const char *name )
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{
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FILE *fp;
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if ( ! ( fp = fopen( name, "w" ) ))
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return false;
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bool r = snapshot( fp );
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fclose( fp );
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return r;
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}
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/** Replace the journal with a snapshot of the current state */
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void
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Loggable::compact ( void )
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{
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fseek( _fp, 0, SEEK_SET );
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ftruncate( fileno( _fp ), 0 );
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if ( ! snapshot( _fp ) )
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FATAL( "Could not write snapshot!" );
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fseek( _fp, 0, SEEK_END );
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}
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#include <stdarg.h>
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/** Buffered sprintf wrapper */
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void
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Loggable::log ( const char *fmt, ... )
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{
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if ( ! _fp )
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return;
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/* FIXME: bogus limit */
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static char buf[1024];
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static int i = 0;
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va_list args;
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if ( fmt )
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{
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va_start( args, fmt );
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i += vsprintf( buf + i, fmt, args );
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va_end( args );
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}
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if ( rindex( buf, '\n' ) )
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{
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_transaction.push( strdup( buf ) );
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i = 0;
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}
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}
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/** End the current transaction and commit it to the journal */
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void
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Loggable::flush ( void )
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{
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if ( ! _fp )
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{
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// printf( "error: no log file open!\n" );
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while ( ! _transaction.empty() )
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{
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free( _transaction.front() );
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_transaction.pop();
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}
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return;
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}
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int n = _transaction.size();
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if ( n > 1 )
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fprintf( _fp, "{\n" );
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while ( ! _transaction.empty() )
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{
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char *s = _transaction.front();
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_transaction.pop();
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if ( n > 1 )
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fprintf( _fp, "\t" );
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fprintf( _fp, "%s", s );
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free( s );
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}
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if ( n > 1 )
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fprintf( _fp, "}\n" );
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if ( n )
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/* something done, reset undo index */
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_undo_offset = ftell( _fp );
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fflush( _fp );
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}
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/** Print bidirectional journal entry */
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void
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Loggable::log_print( const Log_Entry *o, const Log_Entry *n ) const
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{
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if ( ! _fp )
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return;
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if ( n )
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for ( int i = 0; i < n->size(); ++i )
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{
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const char *s, *v;
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n->get( i, &s, &v );
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log( "%s %s%s", s, v, n->size() == i + 1 ? "" : " " );
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}
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if ( o && o->size() )
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{
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if ( n ) log( " << " );
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for ( int i = 0; i < o->size(); ++i )
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{
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const char *s, *v;
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o->get( i, &s, &v );
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log( "%s %s%s", s, v, o->size() == i + 1 ? "" : " " );
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}
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}
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log( "\n" );
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}
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/** Remember current object state for later comparison. *Must* be
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* called before any user action that might change one of the object's
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* journaled properties. */
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void
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Loggable::log_start ( void )
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{
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if ( ! _old_state )
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{
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_old_state = new Log_Entry;
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||
|
||
get( *_old_state );
|
||
}
|
||
++_nest;
|
||
}
|
||
|
||
/** Log any change to the object's state since log_start(). */
|
||
void
|
||
Loggable::log_end ( void )
|
||
{
|
||
ASSERT( _old_state, "Programming error: log_end() called before log_start()" );
|
||
|
||
if ( --_nest > 0 )
|
||
return;
|
||
|
||
Log_Entry *new_state;
|
||
|
||
new_state = new Log_Entry;
|
||
|
||
get( *new_state );
|
||
|
||
if ( Log_Entry::diff( _old_state, new_state ) )
|
||
{
|
||
log( "%s 0x%X set ", class_name(), _id );
|
||
|
||
log_print( _old_state, new_state );
|
||
}
|
||
|
||
delete new_state;
|
||
delete _old_state;
|
||
|
||
_old_state = NULL;
|
||
|
||
if ( Loggable::_level == 0 )
|
||
Loggable::flush();
|
||
}
|
||
|
||
/** Log object creation. *Must* be called at the end of all public
|
||
* constructors for leaf classes */
|
||
void
|
||
Loggable::log_create ( void ) const
|
||
{
|
||
if ( ! _fp )
|
||
/* replaying, don't bother */
|
||
|
||
return;
|
||
log( "%s 0x%X create ", class_name(), _id );
|
||
|
||
Log_Entry e;
|
||
|
||
get( e );
|
||
|
||
if ( e.size() )
|
||
log_print( NULL, &e );
|
||
else
|
||
log( "\n" );
|
||
|
||
if ( Loggable::_level == 0 )
|
||
Loggable::flush();
|
||
}
|
||
|
||
/** record this loggable's unjournaled state in memory */
|
||
void
|
||
Loggable::record_unjournaled ( void ) const
|
||
{
|
||
Log_Entry *e = new Log_Entry();
|
||
|
||
get_unjournaled( *e );
|
||
|
||
Log_Entry *le = _loggables_unjournaled[ _id ];
|
||
|
||
if ( le )
|
||
delete le;
|
||
|
||
if ( e->size() )
|
||
{
|
||
_loggables_unjournaled[ _id ] = e;
|
||
DMESSAGE( "logging %s", e->print() );
|
||
}
|
||
else
|
||
/* don't waste space on loggables with no unjournaled properties */
|
||
_loggables_unjournaled[ _id ] = NULL;
|
||
}
|
||
|
||
/** Log object destruction. *Must* be called at the beginning of the
|
||
* destructors of leaf classes */
|
||
void
|
||
Loggable::log_destroy ( void ) const
|
||
{
|
||
/* the unjournaled state may have changed: make a note of it. */
|
||
record_unjournaled();
|
||
|
||
if ( ! _fp )
|
||
/* tearing down... don't bother */
|
||
return;
|
||
|
||
log( "%s 0x%X destroy << ", class_name(), _id );
|
||
|
||
Log_Entry e;
|
||
|
||
get( e );
|
||
|
||
log_print( NULL, &e );
|
||
|
||
if ( Loggable::_level == 0 )
|
||
Loggable::flush();
|
||
}
|