Transfer/Sync/Core.pm

##    $Id: Core.pm,v 1.5 2003/02/11 05:30:47 joko Exp $
##
##    Copyright (c) 2002  Andreas Motl <andreas.motl@ilo.de>
##
##    See COPYRIGHT section in pod text below for usage and distribution rights.
##
##    ----------------------------------------------------------------------------------------
##    $Log: Core.pm,v $
##    Revision 1.5  2003/02/11 05:30:47  joko
##    + minor fixes and some debugging mud
##
##    Revision 1.4  2003/02/09 05:01:10  joko
##    + major structure changes
##    - refactored code to sister modules
##
##    Revision 1.3  2003/01/20 17:01:14  joko
##    + cosmetics and debugging
##    + probably refactored code to new plugin-modules 'Metadata.pm' and/or 'StorageInterface.pm' (guess it was the last one...)
##
##    Revision 1.2  2003/01/19 02:05:42  joko
##    - removed pod-documentation: now in Data/Transfer/Sync.pod
##
##    Revision 1.1  2003/01/19 01:23:04  joko
##    + new from Data/Transfer/Sync.pm
##
##    Revision 1.11  2002/12/23 07:10:59  joko
##    + using MD5 for checksum generation again - the 32-bit integer hash from DBI seems to be too lazy
##
##    Revision 1.10  2002/12/19 01:07:16  joko
##    + fixed output done via $logger
##
##    Revision 1.9  2002/12/16 07:02:34  jonen
##    + added comment
##
##    Revision 1.8  2002/12/15 02:03:09  joko
##    + fixed logging-messages
##    + additional metadata-checks
##
##    Revision 1.7  2002/12/13 21:49:34  joko
##    + sub configure
##    + sub checkOptions
##
##    Revision 1.6  2002/12/06 04:49:10  jonen
##    + disabled output-puffer here
##
##    Revision 1.5  2002/12/05 08:06:05  joko
##    + bugfix with determining empty fields (Null) with DBD::CSV
##    + debugging
##    + updated comments
##
##    Revision 1.4  2002/12/03 15:54:07  joko
##    + {import}-flag is now {prepare}-flag
##
##    Revision 1.3  2002/12/01 22:26:59  joko
##    + minor cosmetics for logging
##
##    Revision 1.2  2002/12/01 04:43:25  joko
##    + mapping deatil entries may now be either an ARRAY or a HASH
##    + erase flag is used now (for export-operations)
##    + expressions to refer to values inside deep nested structures
##    - removed old mappingV2-code
##    + cosmetics
##    + sub _erase_all
##
##    Revision 1.1  2002/11/29 04:45:50  joko
##    + initial check in
##
##    Revision 1.1  2002/10/10 03:44:21  cvsjoko
##    + new
##    ----------------------------------------------------------------------------------------


package Data::Transfer::Sync::Core;

use strict;
use warnings;

use mixin::with qw( Data::Transfer::Sync );


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   main

use Data::Dumper;

use misc::HashExt;
use Data::Compare::Struct qw( getDifference isEmpty );
use Data::Storage::Container;
use DesignPattern::Object;
use libdb qw( quotesql );

# get logger instance
my $logger = Log::Dispatch::Config->instance;

$| = 1;

=pod
sub new {
  my $invocant = shift;
  my $class = ref($invocant) || $invocant;
  my $self = {};
  $logger->debug( __PACKAGE__ . "->new(@_)" );
  bless $self, $class;
  $self->configure(@_);
  return $self;
}
=cut


sub _init {
  my $self = shift;

  # build new container if necessary
  $self->{container} = Data::Storage::Container->new() if !$self->{container};
  
  # add storages to container (optional)
  foreach (keys %{$self->{storages}}) {
    $self->{container}->addStorage($_, $self->{storages}->{$_});
  }
  
  # trace
    #print Dumper($self);
    #exit;

  return 1;
  
}

sub _initV1 {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->_initV1" );
  die("this should not be reached!");
  # tag storages with id-authority and checksum-provider information
  # TODO: better store tag inside metadata to hold bits together!
  map { $self->{container}->{storage}->{$_}->{isIdentAuthority} = 1 } @{$self->{id_authorities}};
  map { $self->{container}->{storage}->{$_}->{isChecksumAuthority} = 1; } @{$self->{checksum_authorities}};
  map { $self->{container}->{storage}->{$_}->{isWriteProtected} = 1; } @{$self->{write_protected}};
}


# TODO: abstract the hardwired use of "source" and "target" in here somehow - hmmmm.......  /(="§/%???
sub _run {

  my $self = shift;
  
  #print "verbose: ", $self->{verbose}, "\n";
  $self->{verbose} = 1;
  
  $logger->debug( __PACKAGE__ . "->_run" );

  # for statistics
  my $tc = OneLineDumpHash->new( {} );
  my $results;
  
  # set of objects is already in $self->{args}
  # TODO: make independent of the terminology "object..."
  $results = $self->{args}->{objectSet} if $self->{args}->{objectSet};

  # apply filter
  if (my $filter = $self->{meta}->{source}->{filter}) {
    #print Dumper($filter);
    #exit;
    $results ||= $self->_getNodeList('source', $filter);
  }
  
  # get reference to node list from convenient method provided by CORE-HANDLE
  $results ||= $self->_getNodeList('source');

  # checkpoint: do we actually have a list to iterate through?
  if (!$results || !@{$results}) {
    $logger->notice( __PACKAGE__ . "->_run: No nodes to synchronize." );
    return;
  }


  # check if we actually *have* a synchronization method
  if (!$self->{options}->{metadata}->{syncMethod}) {
    $logger->critical( __PACKAGE__ . "->_run: No synchronization method (checksum|timestamp) specified" );
    return;
  }
    
  
  # dereference
  my @results = @{$results};

  # iterate through set
  foreach my $source_node_real (@results) {

    print ":" if $self->{verbose};

    $tc->{total}++;

#print "========================  iter", "\n";

    # clone object (in case we have to modify it here)
    # TODO:
    #   - is a "deep_copy" needed here if occouring modifications take place?
    #   - puuhhhh, i guess a deep_copy would destroy tangram mechanisms?
    #   - after all, just take care for now that this object doesn't get updated!
    #   - so, just use its reference for now - if some cloning is needed in future, do this here!
    my $source_node = $source_node_real;

    # modify entry - handle new style callbacks (the readers)

    # trace
      #print Dumper($source_node);
      #exit;

    my $descent = 'source';

    # handle callbacks right now while scanning them (asymmetric to the writers)
    my $map_callbacks = {};
    if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {

      # trace
        #print Dumper($callbacks);
        #exit;

      my $error = 0;

      foreach my $node (keys %{$callbacks->{read}}) {
        
        my $object = $source_node;
        my $value; # = $source_node->{$node};

      # trace
        #print Dumper($self->{options});

        # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
        #my $perl_callback = $self->{meta}->{$descent}->{node} . '::' . $node . '_read';
        my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $node . '_read';
        my $evalstring = 'return ' . $perl_callback . '( { object => $object, property => $node, value => $value, storage => $self->{meta}->{$descent}->{storage} } );';
        #print $evalstring, "\n"; exit;
        my $cb_result = eval($evalstring);
        if ($@) {
          $error = 1;
          $logger->error( __PACKAGE__ . "->_run: $@" );
          next;
        }
        # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
        
        $source_node->{$node} = $cb_result;

      }

    }

    # trace
      #print Dumper($source_node);

    # exclude defined fields  (simply delete from object)
    map { delete $source_node->{$_} } @{$self->{meta}->{source}->{subnodes_exclude}};
    
    # here we accumulate information about the status of the current node (payload/row/object/item/entry)
    $self->{node} = {};
    $self->{node}->{source}->{payload} = $source_node;

    # trace
      #print Dumper($self->{node});
      #exit;

    # determine ident of entry
    my $identOK = $self->_resolveNodeIdent('source');
    #if (!$identOK && lc $self->{args}->{direction} ne 'import') {
    if (!$identOK) {
      #print Dumper($self->{meta}->{source});
      $logger->critical( __PACKAGE__ . "->_run: No ident found in source node ( nodeName='$self->{meta}->{source}->{nodeName}', nodeType='$self->{meta}->{source}->{nodeType}') try to \"prepare\" this node first?" );
      return;
    }

    #print "l" if $self->{verbose};
    my $statOK = $self->_statloadNode('target', $self->{node}->{source}->{ident});

    # mark node as new either if there's no ident or if stat/load failed
    if (!$statOK) {
      $self->{node}->{status}->{new} = 1;
      print "n" if $self->{verbose};
    }

#print "checksum", "\n";
    
    #print Dumper($self);
    
    # determine status of entry by synchronization method
    if ( lc $self->{options}->{metadata}->{syncMethod} eq 'checksum' ) {
    #if ( $statOK && (lc $self->{args}->{method} eq 'checksum') ) {
    #if ( !$self->{node}->{status}->{new} && (lc $self->{args}->{method} eq 'checksum') ) {
      
    # calculate checksum of source node
      #$self->_calcChecksum('source');
      if (!$self->_readChecksum('source')) {
        $logger->warning( __PACKAGE__ . "->_run: Could not find \"source\" entry with ident=\"$self->{node}->{source}->{ident}\"" );
        $tc->{skip}++;
        print "s" if $self->{verbose};
        next;
      }
      
      # get checksum from synchronization target
      $self->_readChecksum('target');
      #if (!$self->_readChecksum('target')) {
      #  $logger->critical( __PACKAGE__ . "->_readChecksum: Could not find \"target\" entry with ident=\"$self->{node}->{source}->{ident}\"" );
      #  next;
      #}
  
      # pre flight check: do we actually have a checksum provided?
      #if (!$self->{node}->{source}->{checksum}) {
      #  print "Source checksum for entry with ident \"$self->{node}->{source}->{ident}\" could not be calculated, maybe it's missing?.", "\n";
      #  return;
      #}
      
      # determine if entry is "new" or "dirty"
      # after all, this seems to be the point where the hammer falls.....
      print "c" if $self->{verbose};

      # trace
        #print Dumper($self->{node});
        #exit;

      $self->{node}->{status}->{new} = !$self->{node}->{target}->{checksum};
      if (!$self->{node}->{status}->{new}) {
        $self->{node}->{status}->{dirty} = 
          $self->{node}->{status}->{new} || 
          (!$self->{node}->{source}->{checksum} || !$self->{node}->{target}->{checksum}) || 
          ($self->{node}->{source}->{checksum} ne $self->{node}->{target}->{checksum}) || 
          $self->{args}->{force};
      }

    } else {
      $logger->warning( __PACKAGE__ . "->_run: Synchronization method '$self->{options}->{metadata}->{syncMethod}' is not implemented" );
      $tc->{skip}++;
      print "s" if $self->{verbose};
      next;
      
    }

    # first reaction on entry-status: continue with next entry if the current is already "in sync"
    if (!$self->{node}->{status}->{new} && !$self->{node}->{status}->{dirty}) {
      $tc->{in_sync}++;
      next;
    }

    # build map to actually transfer the data from source to target
    $self->buildAttributeMap();


    # trace
      #print Dumper($self->{node}); exit;
      #print "attempt", "\n";

    # additional (new) checks for feature "write-protection"
    if ($self->{meta}->{target}->{storage}->{isWriteProtected}) {
      $tc->{attempt_transfer}++;
      print "\n" if $self->{verbose};
      $logger->notice( __PACKAGE__ . "->_run: Target is write-protected. Will not insert or modify node. " .
          "(Ident: $self->{node}->{source}->{ident} " . "Dump:\n" . Dumper($self->{node}->{source}->{payload}) . ")" );
      print "\n" if $self->{verbose};
      $tc->{skip}++;
      next;
    }

    # trace
      #print Dumper($self);
      #exit;

    # transfer contents of map to target
    if ($self->{node}->{status}->{new}) {
      $tc->{attempt_new}++;
      $self->_doTransferToTarget('insert');
      # asymmetry: refetch node from target to re-calculate new ident and checksum (TODO: is IdentAuthority of relevance here?)
      #print Dumper($self->{node});
      $self->_statloadNode('target', $self->{node}->{target}->{ident}, 1);
      $self->_readChecksum('target');

    } elsif ($self->{node}->{status}->{dirty}) {
      $tc->{attempt_modify}++;
      # asymmetry: get ident before updating (TODO: is IdentAuthority of relevance here?)
      $self->{node}->{target}->{ident} = $self->{node}->{map}->{$self->{meta}->{target}->{IdentProvider}->{arg}};
      $self->_doTransferToTarget('update');
      $self->_readChecksum('target');
    }

    if ($self->{node}->{status}->{ok}) {
      $tc->{ok}++;
      print "t" if $self->{verbose};
    }
    
    if ($self->{node}->{status}->{error}) {
      $tc->{error}++;
      push( @{$tc->{error_per_row}}, $self->{node}->{status}->{error} );
      print "e" if $self->{verbose};
    }
    
    # trace
      #print Dumper($self);
      #exit;
    
    # change ident in source (take from target), if transfer was ok and target is an IdentAuthority
    # this is (for now) called a "retransmit" indicated by a "r"-character when verbosing
    #if ($self->{node}->{status}->{ok} && $self->{options}->{target}->{storage}->{idAuthority}) {
    if ($self->{node}->{status}->{ok} && $self->{meta}->{target}->{isIdentAuthority}) {
      print "r" if $self->{verbose};
      #print Dumper($self->{meta});
      #print Dumper($self->{node});
      #exit;
      $self->_doModifySource_IdentChecksum($self->{node}->{target}->{ident});
    }

  }

  print "\n" if $self->{verbose};
  
  # build user-message from some stats
    my $msg = "statistics: $tc";
    
    if ($tc->{error_per_row}) {
      $msg .= "\n";
      $msg .= "errors from \"error_per_row\":" . "\n";
      $msg .= Dumper($tc->{error_per_row});
    }
    
    # todo!!!
    #sysevent( { usermsg => $msg, level => $level }, $taskEvent );
    $logger->info( __PACKAGE__ . "->_run: $msg" );

  return $tc;

}


# refactor this as some core-function to do a generic dump resolving data-encapsulations of e.g. Set::Object
sub _dumpCompact {
  my $self = shift;

  #my $vars = \@_;
  my @data = ();

  my $count = 0;
  foreach (@_) {
    my $item = {};
    foreach my $key (keys %$_) {
      my $val = $_->{$key};

#print Dumper($val);

      if (ref $val eq 'Set::Object') {
        #print "========================= SET", "\n";
#print Dumper($val);
        #print Dumper($val->members());
        #$val = $val->members();
        #$vars->[$count]->{$key} = $val->members() if $val->can("members");
        #$item->{$key} = $val->members() if $val->can("members");
        $item->{$key} = $val->members();
        #print Dumper($vars->[$count]->{$key});

      } else {
        $item->{$key} = $val;
      }

    }
    push @data, $item;
    $count++;
  }

#print "Dump:", Dumper(@data), "\n";

  $Data::Dumper::Indent = 0;
  my $result = Dumper(@data);
  $Data::Dumper::Indent = 2;
  return $result;
  
}


sub _doTransferToTarget {
  my $self = shift;
  my $action = shift;
    
  # trace
    #print Dumper($self->{meta});
    #print Dumper($self->{node});
    #exit;
    
  $self->_modifyNode('target', $action, $self->{node}->{map});
}


sub _doModifySource_IdentChecksum {
  my $self = shift;
  my $ident_new = shift;
  # this changes an old node to a new one including ident and checksum
  # TODO:
  #   - eventually introduce an external resource to store this data to
  #   - we won't have to "re"-modify the source node here
  my $map = {
    $self->{meta}->{source}->{IdentProvider}->{arg} => $ident_new,
    cs => $self->{node}->{target}->{checksum},
  };

#print Dumper($map);
#print Dumper($self->{node});
#exit;

  $self->_modifyNode('source', 'update', $map);
}


sub _prepareNode_MetaProperties {
  my $self = shift;
  my $descent = shift;

  $logger->info( __PACKAGE__ . "->_prepareNode_MetaProperties( descent $descent )" );
  
  # TODO: this should (better) be: "my $firstnode = $self->_getFirstNode($descent);"
  my $list = $self->_getNodeList($descent);
  
  # get first node
  my $firstnode = $list->[0];
  
  # check if node contains meta properties/nodes
  # TODO: "cs" is hardcoded here!
  my @required = ( $self->{meta}->{$descent}->{IdentProvider}->{arg}, 'cs' );
  my @found = keys %$firstnode;
  #my @diff = getDifference(\@found, \@required);
  my $diff = getDifference(\@required, \@found);
  #print Dumper(@found);
  #print Dumper(@required);
  #print Dumper(@diff);
  #if (!$#diff || $#diff == -1) {
  if (isEmpty($diff)) {
    $logger->warning( __PACKAGE__ . "->_prepareNode_MetaProperties: node is lacking meta properties - will try to alter..." );
    foreach (@required) {
      my $sql = "ALTER TABLE $self->{meta}->{$descent}->{node} ADD COLUMN $_";
      #print "sql: $sql", "\n";
      my $res = $self->{meta}->{$descent}->{storage}->sendCommand($sql);
      #print Dumper($res->getStatus());
    }
  }

}

sub _prepareNode_DummyIdent {
  my $self = shift;
  my $descent = shift;

  $logger->info( __PACKAGE__ . "->_prepareNode_DummyIdent( descent $descent )" );

  my $list = $self->_getNodeList($descent);
  #print Dumper($list);
  my $i = 0;
  my $ident_base = 5678983;
  my $ident_appendix = '0001';
  foreach my $node (@$list) {
    my $ident_dummy = $i + $ident_base;
    $ident_dummy .= $ident_appendix;
    my $map = {
      $self->{meta}->{$descent}->{IdentProvider}->{arg} => $ident_dummy,
      cs => undef,
    };
    
    # diff lists and ...
    my $diff = getDifference([keys %$node], [keys %$map]);
    next if $#{$diff} == -1;
    
    # ... build criteria including all columns
    my @crits;
    foreach my $property (@$diff) {
      next if !$property;
      my $value = $node->{$property};
      next if !$value;
      push @crits, "$property='" . quotesql($value) . "'";
    }
    my $crit = join ' AND ', @crits;
    print "p" if $self->{verbose};

#print Dumper($map);
#print Dumper($crit);

    $self->_modifyNode($descent, 'update', $map, $crit);
    $i++;
  }

  print "\n" if $self->{verbose};
  
  if (!$i) {
    $logger->warning( __PACKAGE__ . "->_prepareNode_DummyIdent: no nodes touched" );
  }
  
}

# TODO: handle this in an abstract way (wipe out use of 'source' and/or 'target' inside core)
sub _otherSide {
  my $self = shift;
  my $descent = shift;
  return 'source' if $descent eq 'target';
  return 'target' if $descent eq 'source';
  return '';
}


1;
__END__
1	joko	1.6	## $Id: Core.pm,v 1.5 2003/02/11 05:30:47 joko Exp $
2	joko	1.1	##
3			## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de>
4			##
5			## See COPYRIGHT section in pod text below for usage and distribution rights.
6			##
7			## ----------------------------------------------------------------------------------------
8	joko	1.2	## $Log: Core.pm,v $
9	joko	1.6	## Revision 1.5 2003/02/11 05:30:47 joko
10			## + minor fixes and some debugging mud
11			##
12	joko	1.5	## Revision 1.4 2003/02/09 05:01:10 joko
13			## + major structure changes
14			## - refactored code to sister modules
15			##
16	joko	1.4	## Revision 1.3 2003/01/20 17:01:14 joko
17			## + cosmetics and debugging
18			## + probably refactored code to new plugin-modules 'Metadata.pm' and/or 'StorageInterface.pm' (guess it was the last one...)
19			##
20	joko	1.3	## Revision 1.2 2003/01/19 02:05:42 joko
21			## - removed pod-documentation: now in Data/Transfer/Sync.pod
22			##
23	joko	1.2	## Revision 1.1 2003/01/19 01:23:04 joko
24			## + new from Data/Transfer/Sync.pm
25			##
26	joko	1.1	## Revision 1.11 2002/12/23 07:10:59 joko
27			## + using MD5 for checksum generation again - the 32-bit integer hash from DBI seems to be too lazy
28			##
29			## Revision 1.10 2002/12/19 01:07:16 joko
30			## + fixed output done via $logger
31			##
32			## Revision 1.9 2002/12/16 07:02:34 jonen
33			## + added comment
34			##
35			## Revision 1.8 2002/12/15 02:03:09 joko
36			## + fixed logging-messages
37			## + additional metadata-checks
38			##
39			## Revision 1.7 2002/12/13 21:49:34 joko
40			## + sub configure
41			## + sub checkOptions
42			##
43			## Revision 1.6 2002/12/06 04:49:10 jonen
44			## + disabled output-puffer here
45			##
46			## Revision 1.5 2002/12/05 08:06:05 joko
47			## + bugfix with determining empty fields (Null) with DBD::CSV
48			## + debugging
49			## + updated comments
50			##
51			## Revision 1.4 2002/12/03 15:54:07 joko
52			## + {import}-flag is now {prepare}-flag
53			##
54			## Revision 1.3 2002/12/01 22:26:59 joko
55			## + minor cosmetics for logging
56			##
57			## Revision 1.2 2002/12/01 04:43:25 joko
58			## + mapping deatil entries may now be either an ARRAY or a HASH
59			## + erase flag is used now (for export-operations)
60			## + expressions to refer to values inside deep nested structures
61			## - removed old mappingV2-code
62			## + cosmetics
63			## + sub _erase_all
64			##
65			## Revision 1.1 2002/11/29 04:45:50 joko
66			## + initial check in
67			##
68			## Revision 1.1 2002/10/10 03:44:21 cvsjoko
69			## + new
70			## ----------------------------------------------------------------------------------------
71
72
73			package Data::Transfer::Sync::Core;
74
75			use strict;
76			use warnings;
77
78			use mixin::with qw( Data::Transfer::Sync );
79
80
81			# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - main
82
83			use Data::Dumper;
84
85			use misc::HashExt;
86			use Data::Compare::Struct qw( getDifference isEmpty );
87			use Data::Storage::Container;
88			use DesignPattern::Object;
89	joko	1.5	use libdb qw( quotesql );
90	joko	1.1
91			# get logger instance
92			my $logger = Log::Dispatch::Config->instance;
93
94			$\| = 1;
95
96			=pod
97			sub new {
98			my $invocant = shift;
99			my $class = ref($invocant) \|\| $invocant;
100			my $self = {};
101			$logger->debug( __PACKAGE__ . "->new(@_)" );
102			bless $self, $class;
103			$self->configure(@_);
104			return $self;
105			}
106			=cut
107
108
109			sub _init {
110			my $self = shift;
111
112			# build new container if necessary
113			$self->{container} = Data::Storage::Container->new() if !$self->{container};
114
115			# add storages to container (optional)
116			foreach (keys %{$self->{storages}}) {
117			$self->{container}->addStorage($_, $self->{storages}->{$_});
118			}
119
120	joko	1.5	# trace
121			#print Dumper($self);
122			#exit;
123
124	joko	1.1	return 1;
125
126			}
127
128			sub _initV1 {
129			my $self = shift;
130	joko	1.4	$logger->debug( __PACKAGE__ . "->_initV1" );
131			die("this should not be reached!");
132	joko	1.1	# tag storages with id-authority and checksum-provider information
133			# TODO: better store tag inside metadata to hold bits together!
134			map { $self->{container}->{storage}->{$_}->{isIdentAuthority} = 1 } @{$self->{id_authorities}};
135			map { $self->{container}->{storage}->{$_}->{isChecksumAuthority} = 1; } @{$self->{checksum_authorities}};
136			map { $self->{container}->{storage}->{$_}->{isWriteProtected} = 1; } @{$self->{write_protected}};
137			}
138
139
140			# TODO: abstract the hardwired use of "source" and "target" in here somehow - hmmmm....... /(="§/%???
141	joko	1.4	sub _run {
142	joko	1.1
143			my $self = shift;
144
145	joko	1.4	#print "verbose: ", $self->{verbose}, "\n";
146			$self->{verbose} = 1;
147
148			$logger->debug( __PACKAGE__ . "->_run" );
149
150			# for statistics
151	joko	1.1	my $tc = OneLineDumpHash->new( {} );
152			my $results;
153
154			# set of objects is already in $self->{args}
155			# TODO: make independent of the terminology "object..."
156			$results = $self->{args}->{objectSet} if $self->{args}->{objectSet};
157
158			# apply filter
159			if (my $filter = $self->{meta}->{source}->{filter}) {
160			#print Dumper($filter);
161			#exit;
162			$results \|\|= $self->_getNodeList('source', $filter);
163			}
164
165			# get reference to node list from convenient method provided by CORE-HANDLE
166			$results \|\|= $self->_getNodeList('source');
167
168			# checkpoint: do we actually have a list to iterate through?
169			if (!$results \|\| !@{$results}) {
170	joko	1.4	$logger->notice( __PACKAGE__ . "->_run: No nodes to synchronize." );
171	joko	1.1	return;
172			}
173	joko	1.4
174
175
176			# check if we actually have a synchronization method
177			if (!$self->{options}->{metadata}->{syncMethod}) {
178			$logger->critical( __PACKAGE__ . "->_run: No synchronization method (checksum\|timestamp) specified" );
179			return;
180			}
181
182	joko	1.1
183			# dereference
184			my @results = @{$results};
185
186			# iterate through set
187			foreach my $source_node_real (@results) {
188
189	joko	1.5	print ":" if $self->{verbose};
190
191	joko	1.1	$tc->{total}++;
192
193			#print "======================== iter", "\n";
194
195			# clone object (in case we have to modify it here)
196			# TODO:
197			# - is a "deep_copy" needed here if occouring modifications take place?
198			# - puuhhhh, i guess a deep_copy would destroy tangram mechanisms?
199			# - after all, just take care for now that this object doesn't get updated!
200	joko	1.5	# - so, just use its reference for now - if some cloning is needed in future, do this here!
201	joko	1.1	my $source_node = $source_node_real;
202
203			# modify entry - handle new style callbacks (the readers)
204	joko	1.6
205			# trace
206			#print Dumper($source_node);
207			#exit;
208	joko	1.1
209			my $descent = 'source';
210
211			# handle callbacks right now while scanning them (asymmetric to the writers)
212			my $map_callbacks = {};
213			if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {
214
215	joko	1.5	# trace
216			#print Dumper($callbacks);
217			#exit;
218
219	joko	1.1	my $error = 0;
220
221			foreach my $node (keys %{$callbacks->{read}}) {
222
223			my $object = $source_node;
224			my $value; # = $source_node->{$node};
225
226	joko	1.6	# trace
227			#print Dumper($self->{options});
228	joko	1.5
229	joko	1.1	# ------------ half-redundant: make $self->callCallback($object, $value, $opts)
230	joko	1.3	#my $perl_callback = $self->{meta}->{$descent}->{node} . '::' . $node . '_read';
231			my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $node . '_read';
232	joko	1.1	my $evalstring = 'return ' . $perl_callback . '( { object => $object, property => $node, value => $value, storage => $self->{meta}->{$descent}->{storage} } );';
233			#print $evalstring, "\n"; exit;
234			my $cb_result = eval($evalstring);
235			if ($@) {
236	joko	1.6	$error = 1;
237	joko	1.5	$logger->error( __PACKAGE__ . "->_run: $@" );
238	joko	1.6	next;
239	joko	1.1	}
240			# ------------ half-redundant: make $self->callCallback($object, $value, $opts)
241
242			$source_node->{$node} = $cb_result;
243
244			}
245
246			}
247
248	joko	1.5	# trace
249			#print Dumper($source_node);
250	joko	1.1
251			# exclude defined fields (simply delete from object)
252			map { delete $source_node->{$_} } @{$self->{meta}->{source}->{subnodes_exclude}};
253
254			# here we accumulate information about the status of the current node (payload/row/object/item/entry)
255			$self->{node} = {};
256			$self->{node}->{source}->{payload} = $source_node;
257
258	joko	1.5	# trace
259			#print Dumper($self->{node});
260			#exit;
261	joko	1.1
262			# determine ident of entry
263			my $identOK = $self->_resolveNodeIdent('source');
264			#if (!$identOK && lc $self->{args}->{direction} ne 'import') {
265			if (!$identOK) {
266			#print Dumper($self->{meta}->{source});
267	joko	1.4	$logger->critical( __PACKAGE__ . "->_run: No ident found in source node ( nodeName='$self->{meta}->{source}->{nodeName}', nodeType='$self->{meta}->{source}->{nodeType}') try to \"prepare\" this node first?" );
268	joko	1.1	return;
269			}
270
271	joko	1.4	#print "l" if $self->{verbose};
272	joko	1.1	my $statOK = $self->_statloadNode('target', $self->{node}->{source}->{ident});
273
274			# mark node as new either if there's no ident or if stat/load failed
275			if (!$statOK) {
276			$self->{node}->{status}->{new} = 1;
277			print "n" if $self->{verbose};
278			}
279
280			#print "checksum", "\n";
281
282	joko	1.4	#print Dumper($self);
283
284	joko	1.1	# determine status of entry by synchronization method
285	joko	1.4	if ( lc $self->{options}->{metadata}->{syncMethod} eq 'checksum' ) {
286	joko	1.1	#if ( $statOK && (lc $self->{args}->{method} eq 'checksum') ) {
287			#if ( !$self->{node}->{status}->{new} && (lc $self->{args}->{method} eq 'checksum') ) {
288
289	joko	1.4	# calculate checksum of source node
290	joko	1.1	#$self->_calcChecksum('source');
291			if (!$self->_readChecksum('source')) {
292	joko	1.4	$logger->warning( __PACKAGE__ . "->_run: Could not find \"source\" entry with ident=\"$self->{node}->{source}->{ident}\"" );
293	joko	1.1	$tc->{skip}++;
294			print "s" if $self->{verbose};
295			next;
296			}
297
298			# get checksum from synchronization target
299			$self->_readChecksum('target');
300			#if (!$self->_readChecksum('target')) {
301			# $logger->critical( __PACKAGE__ . "->_readChecksum: Could not find \"target\" entry with ident=\"$self->{node}->{source}->{ident}\"" );
302			# next;
303			#}
304
305			# pre flight check: do we actually have a checksum provided?
306			#if (!$self->{node}->{source}->{checksum}) {
307			# print "Source checksum for entry with ident \"$self->{node}->{source}->{ident}\" could not be calculated, maybe it's missing?.", "\n";
308			# return;
309			#}
310
311			# determine if entry is "new" or "dirty"
312			# after all, this seems to be the point where the hammer falls.....
313			print "c" if $self->{verbose};
314	joko	1.5
315			# trace
316			#print Dumper($self->{node});
317			#exit;
318
319	joko	1.1	$self->{node}->{status}->{new} = !$self->{node}->{target}->{checksum};
320			if (!$self->{node}->{status}->{new}) {
321			$self->{node}->{status}->{dirty} =
322			$self->{node}->{status}->{new} \|\|
323			(!$self->{node}->{source}->{checksum} \|\| !$self->{node}->{target}->{checksum}) \|\|
324			($self->{node}->{source}->{checksum} ne $self->{node}->{target}->{checksum}) \|\|
325			$self->{args}->{force};
326			}
327
328	joko	1.4	} else {
329			$logger->warning( __PACKAGE__ . "->_run: Synchronization method '$self->{options}->{metadata}->{syncMethod}' is not implemented" );
330			$tc->{skip}++;
331			print "s" if $self->{verbose};
332			next;
333
334	joko	1.1	}
335
336			# first reaction on entry-status: continue with next entry if the current is already "in sync"
337			if (!$self->{node}->{status}->{new} && !$self->{node}->{status}->{dirty}) {
338			$tc->{in_sync}++;
339			next;
340			}
341
342			# build map to actually transfer the data from source to target
343	joko	1.4	$self->buildAttributeMap();
344	joko	1.1
345
346	joko	1.5	# trace
347			#print Dumper($self->{node}); exit;
348			#print "attempt", "\n";
349	joko	1.1
350			# additional (new) checks for feature "write-protection"
351			if ($self->{meta}->{target}->{storage}->{isWriteProtected}) {
352			$tc->{attempt_transfer}++;
353			print "\n" if $self->{verbose};
354	joko	1.4	$logger->notice( __PACKAGE__ . "->_run: Target is write-protected. Will not insert or modify node. " .
355	joko	1.1	"(Ident: $self->{node}->{source}->{ident} " . "Dump:\n" . Dumper($self->{node}->{source}->{payload}) . ")" );
356			print "\n" if $self->{verbose};
357			$tc->{skip}++;
358			next;
359			}
360
361	joko	1.5	# trace
362			#print Dumper($self);
363			#exit;
364	joko	1.4
365	joko	1.1	# transfer contents of map to target
366			if ($self->{node}->{status}->{new}) {
367			$tc->{attempt_new}++;
368			$self->_doTransferToTarget('insert');
369			# asymmetry: refetch node from target to re-calculate new ident and checksum (TODO: is IdentAuthority of relevance here?)
370			#print Dumper($self->{node});
371			$self->_statloadNode('target', $self->{node}->{target}->{ident}, 1);
372			$self->_readChecksum('target');
373
374			} elsif ($self->{node}->{status}->{dirty}) {
375			$tc->{attempt_modify}++;
376			# asymmetry: get ident before updating (TODO: is IdentAuthority of relevance here?)
377			$self->{node}->{target}->{ident} = $self->{node}->{map}->{$self->{meta}->{target}->{IdentProvider}->{arg}};
378			$self->_doTransferToTarget('update');
379			$self->_readChecksum('target');
380			}
381
382			if ($self->{node}->{status}->{ok}) {
383			$tc->{ok}++;
384			print "t" if $self->{verbose};
385			}
386
387			if ($self->{node}->{status}->{error}) {
388			$tc->{error}++;
389			push( @{$tc->{error_per_row}}, $self->{node}->{status}->{error} );
390			print "e" if $self->{verbose};
391			}
392
393	joko	1.4	# trace
394			#print Dumper($self);
395			#exit;
396
397	joko	1.1	# change ident in source (take from target), if transfer was ok and target is an IdentAuthority
398			# this is (for now) called a "retransmit" indicated by a "r"-character when verbosing
399	joko	1.5	#if ($self->{node}->{status}->{ok} && $self->{options}->{target}->{storage}->{idAuthority}) {
400			if ($self->{node}->{status}->{ok} && $self->{meta}->{target}->{isIdentAuthority}) {
401	joko	1.1	print "r" if $self->{verbose};
402			#print Dumper($self->{meta});
403			#print Dumper($self->{node});
404			#exit;
405			$self->_doModifySource_IdentChecksum($self->{node}->{target}->{ident});
406			}
407
408			}
409
410			print "\n" if $self->{verbose};
411
412			# build user-message from some stats
413			my $msg = "statistics: $tc";
414
415			if ($tc->{error_per_row}) {
416			$msg .= "\n";
417			$msg .= "errors from \"error_per_row\":" . "\n";
418			$msg .= Dumper($tc->{error_per_row});
419			}
420
421			# todo!!!
422			#sysevent( { usermsg => $msg, level => $level }, $taskEvent );
423	joko	1.4	$logger->info( __PACKAGE__ . "->_run: $msg" );
424	joko	1.1
425			return $tc;
426
427			}
428
429
430			# refactor this as some core-function to do a generic dump resolving data-encapsulations of e.g. Set::Object
431			sub _dumpCompact {
432			my $self = shift;
433
434			#my $vars = \@_;
435			my @data = ();
436
437			my $count = 0;
438			foreach (@_) {
439			my $item = {};
440			foreach my $key (keys %$_) {
441			my $val = $_->{$key};
442
443			#print Dumper($val);
444
445			if (ref $val eq 'Set::Object') {
446			#print "========================= SET", "\n";
447			#print Dumper($val);
448			#print Dumper($val->members());
449			#$val = $val->members();
450			#$vars->[$count]->{$key} = $val->members() if $val->can("members");
451			#$item->{$key} = $val->members() if $val->can("members");
452			$item->{$key} = $val->members();
453			#print Dumper($vars->[$count]->{$key});
454
455			} else {
456			$item->{$key} = $val;
457			}
458
459			}
460			push @data, $item;
461			$count++;
462			}
463
464			#print "Dump:", Dumper(@data), "\n";
465
466			$Data::Dumper::Indent = 0;
467			my $result = Dumper(@data);
468			$Data::Dumper::Indent = 2;
469			return $result;
470
471			}
472
473
474
475			sub _doTransferToTarget {
476			my $self = shift;
477			my $action = shift;
478	joko	1.5
479			# trace
480			#print Dumper($self->{meta});
481			#print Dumper($self->{node});
482			#exit;
483
484	joko	1.1	$self->_modifyNode('target', $action, $self->{node}->{map});
485			}
486	joko	1.4
487	joko	1.1
488			sub _doModifySource_IdentChecksum {
489			my $self = shift;
490			my $ident_new = shift;
491			# this changes an old node to a new one including ident and checksum
492			# TODO:
493			# - eventually introduce an external resource to store this data to
494			# - we won't have to "re"-modify the source node here
495			my $map = {
496			$self->{meta}->{source}->{IdentProvider}->{arg} => $ident_new,
497			cs => $self->{node}->{target}->{checksum},
498			};
499
500			#print Dumper($map);
501			#print Dumper($self->{node});
502			#exit;
503
504			$self->_modifyNode('source', 'update', $map);
505			}
506
507
508
509			sub _prepareNode_MetaProperties {
510			my $self = shift;
511			my $descent = shift;
512
513			$logger->info( __PACKAGE__ . "->_prepareNode_MetaProperties( descent $descent )" );
514
515			# TODO: this should (better) be: "my $firstnode = $self->_getFirstNode($descent);"
516			my $list = $self->_getNodeList($descent);
517
518			# get first node
519			my $firstnode = $list->[0];
520
521			# check if node contains meta properties/nodes
522			# TODO: "cs" is hardcoded here!
523			my @required = ( $self->{meta}->{$descent}->{IdentProvider}->{arg}, 'cs' );
524			my @found = keys %$firstnode;
525			#my @diff = getDifference(\@found, \@required);
526			my $diff = getDifference(\@required, \@found);
527			#print Dumper(@found);
528			#print Dumper(@required);
529			#print Dumper(@diff);
530			#if (!$#diff \|\| $#diff == -1) {
531			if (isEmpty($diff)) {
532			$logger->warning( __PACKAGE__ . "->_prepareNode_MetaProperties: node is lacking meta properties - will try to alter..." );
533			foreach (@required) {
534			my $sql = "ALTER TABLE $self->{meta}->{$descent}->{node} ADD COLUMN $_";
535			#print "sql: $sql", "\n";
536			my $res = $self->{meta}->{$descent}->{storage}->sendCommand($sql);
537			#print Dumper($res->getStatus());
538			}
539			}
540
541			}
542
543			sub _prepareNode_DummyIdent {
544			my $self = shift;
545			my $descent = shift;
546
547			$logger->info( __PACKAGE__ . "->_prepareNode_DummyIdent( descent $descent )" );
548
549			my $list = $self->_getNodeList($descent);
550			#print Dumper($list);
551			my $i = 0;
552			my $ident_base = 5678983;
553			my $ident_appendix = '0001';
554			foreach my $node (@$list) {
555			my $ident_dummy = $i + $ident_base;
556			$ident_dummy .= $ident_appendix;
557			my $map = {
558			$self->{meta}->{$descent}->{IdentProvider}->{arg} => $ident_dummy,
559			cs => undef,
560			};
561
562			# diff lists and ...
563			my $diff = getDifference([keys %$node], [keys %$map]);
564			next if $#{$diff} == -1;
565
566			# ... build criteria including all columns
567			my @crits;
568			foreach my $property (@$diff) {
569			next if !$property;
570			my $value = $node->{$property};
571			next if !$value;
572			push @crits, "$property='" . quotesql($value) . "'";
573			}
574			my $crit = join ' AND ', @crits;
575			print "p" if $self->{verbose};
576
577			#print Dumper($map);
578			#print Dumper($crit);
579
580			$self->_modifyNode($descent, 'update', $map, $crit);
581			$i++;
582			}
583
584			print "\n" if $self->{verbose};
585
586			if (!$i) {
587			$logger->warning( __PACKAGE__ . "->_prepareNode_DummyIdent: no nodes touched" );
588			}
589
590			}
591
592			# TODO: handle this in an abstract way (wipe out use of 'source' and/or 'target' inside core)
593			sub _otherSide {
594			my $self = shift;
595			my $descent = shift;
596			return 'source' if $descent eq 'target';
597			return 'target' if $descent eq 'source';
598			return '';
599			}
600
601
602			1;
603	joko	1.6	__END__
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