Transfer/Sync/Core.pm

##    $Id: Core.pm,v 1.3 2003/01/20 17:01:14 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 1.3  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;

# 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}}) {
    $self->{container}->addStorage($_, $self->{storages}->{$_});
  }
  
  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) {

    $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!
    my $source_node = $source_node_real;

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

      my $error = 0;

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

        # ------------  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 ($@) {
          die $@;
          $error = 1;
          print $@, "\n";
        }
        # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
        
        $source_node->{$node} = $cb_result;

      }

    }

#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;

#print "res - ident", "\n";

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

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


#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;
    }

#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}) {
      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 $action = shift;
  #print Dumper($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 '';
}

sub _erase_all {
  my $self = shift;
  my $descent = shift;
  #my $node = shift;
  my $node = $self->{meta}->{$descent}->{node};
  $self->{meta}->{$descent}->{storage}->eraseAll($node);
}

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