/[cvs]/nfo/perl/libs/Data/Transfer/Sync/StorageInterface.pm
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revision 1.1 by joko, Mon Jan 20 16:58:46 2003 UTC revision 1.5 by joko, Thu Feb 20 20:24:33 2003 UTC
# Line 6  Line 6 
6  ##  ##
7  ##    ----------------------------------------------------------------------------------------  ##    ----------------------------------------------------------------------------------------
8  ##    $Log$  ##    $Log$
9    ##    Revision 1.5  2003/02/20 20:24:33  joko
10    ##    + additional pre-flight checks
11    ##
12    ##    Revision 1.4  2003/02/14 14:14:38  joko
13    ##    + new code refactored here
14    ##
15    ##    Revision 1.3  2003/02/11 07:54:55  joko
16    ##    + modified module usage
17    ##    + debugging trials
18    ##
19    ##    Revision 1.2  2003/02/09 05:05:58  joko
20    ##    + major structure changes
21    ##    - refactored code to sister modules
22    ##    + refactored code to this place
23    ##
24  ##    Revision 1.1  2003/01/20 16:58:46  joko  ##    Revision 1.1  2003/01/20 16:58:46  joko
25  ##    + initial check-in: here they are....  ##    + initial check-in: here they are....
26  ##  ##
# Line 25  use mixin::with qw( Data::Transfer::Sync Line 40  use mixin::with qw( Data::Transfer::Sync
40    
41  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   main  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   main
42    
 # get logger instance  
 my $logger = Log::Dispatch::Config->instance;  
   
43  use Data::Dumper;  use Data::Dumper;
44    use Hash::Merge qw( merge );
45    use libdb qw( hash2Sql );
46    use Data::Transform::Deep qw( hash2object );
47    
48    
49    # get logger instance
50    my $logger = Log::Dispatch::Config->instance;
51    
52  # this is a shortcut method  # this is a shortcut method
53  # ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...)  # ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...)
54  sub _getNodeList {  sub _getNodeList {
55    my $self = shift;    my $self = shift;
56    my $descent = shift;    my $descent = shift;
57    my $filter = shift;    my $filter = shift;
58      $logger->debug( __PACKAGE__ . "->_getNodeList( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
59    #$results ||= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node});    #$results ||= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node});
60    #$results ||= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node});    #$results ||= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node});
61    my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{nodeName}, $filter);    my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{accessorName}, $filter);
62  #print Dumper($list);  #print Dumper($list);
63    return $list;    return $list;
64  }  }
# Line 48  sub _resolveNodeIdent { Line 67  sub _resolveNodeIdent {
67    my $self = shift;    my $self = shift;
68    my $descent = shift;    my $descent = shift;
69        
70    #print Dumper($self->{node}->{$descent});    # trace
71        #print Dumper($self->{node}->{$descent});
72        #print Dumper($self);
73        #exit;
74        
75      $logger->debug( __PACKAGE__ . "->_resolveNodeIdent( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
76        
77    # get to the payload    # get to the payload
78      #my $item = $specifier->{item};      #my $item = $specifier->{item};
# Line 59  sub _resolveNodeIdent { Line 83  sub _resolveNodeIdent {
83      #my $ident = $self->{$descent}->id($item);      #my $ident = $self->{$descent}->id($item);
84      #my $ident = $self->{meta}->{$descent}->{storage}->id($item);      #my $ident = $self->{meta}->{$descent}->{storage}->id($item);
85    
86      # trace
87        #print Dumper($self->{meta}->{$descent});
88        #exit;
89    
90      my $ident;      my $ident;
91      my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method};      my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method};
92      my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg};      my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg};
93    
94      #print "provider_method: $provider_method", "\n";      # trace
95      #print "provider_arg: $provider_arg", "\n";        #print "provider_method: $provider_method", "\n";
96          #print "provider_arg: $provider_arg", "\n";
97          #print Dumper($payload);
98    
99      # resolve to ident      # resolve to ident
100      if (lc $provider_method eq 'property') {      if (lc $provider_method eq 'property') {
# Line 103  sub _statloadNode { Line 133  sub _statloadNode {
133    my $ident = shift;    my $ident = shift;
134    my $force = shift;    my $force = shift;
135    
136    =pod
137      #print "isa: ", UNIVERSAL::isa($self->{meta}->{$descent}->{storage}), "\n";
138    
139      # this seems to be the first time we access this side,
140      # so just check (again) for a valid storage handle
141      if (! ref $self->{meta}->{$descent}->{storage}) {
142        $logger->critical( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident ): Storage handle undefined!" );
143        return;
144      }
145    =cut
146    
147      #$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident )" );
148    
149    # fetch entry to retrieve checksum from    # fetch entry to retrieve checksum from
150    # was:    # was:
151    if (!$self->{node}->{$descent} || $force) {    if (!$self->{node}->{$descent} || $force) {
# Line 119  sub _statloadNode { Line 162  sub _statloadNode {
162        return;        return;
163      }      }
164    
165  #print "yai!", "\n";      #print Dumper($self->{meta});
166    
167      my $query = {      my $query = {
168        node => $self->{meta}->{$descent}->{nodeName},        node => $self->{meta}->{$descent}->{accessorName},
169        subnodes => [qw( cs )],        subnodes => [qw( cs )],
170        criterias => [        criterias => [
171          { key => $self->{meta}->{$descent}->{IdentProvider}->{arg},          { key => $self->{meta}->{$descent}->{IdentProvider}->{arg},
# Line 131  sub _statloadNode { Line 174  sub _statloadNode {
174        ]        ]
175      };      };
176    
177  print Dumper($query);      # trace
178          #print "query:", "\n";
179          #print Dumper($query);
180    
181        # send query and fetch first entry from result
182          my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query);
183          my $entry = $result->getNextEntry();
184    
185        # trace
186          #print Dumper($entry);
187          #print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n";
188          #my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } );
189          #print Dumper($state);
190    
191      my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query);      # be informed about the status of the query
192          my $status = $result->getStatus();
     my $entry = $result->getNextEntry();  
   
 #print Dumper($entry);  
 #print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n";  
 #my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } );  
 #print Dumper($state);  
   
     my $status = $result->getStatus();  
193    
194  #print Dumper($status);  #print Dumper($status);
195            
# Line 183  print Dumper($query); Line 230  print Dumper($query);
230  }  }
231    
232    
233    sub _touchNodeSet {
234      my $self = shift;
235    
236      $logger->debug( __PACKAGE__ . "->touchNodeSet" );
237    
238      # check descents/nodes: does descent exist / is node available?
239      foreach my $descent (keys %{$self->{meta}}) {
240        
241        # 1. check metadata of descent(s)
242          if (!$self->{meta}->{$descent}) {
243            $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not find descent '$descent' in configuration metadata." );
244            next;
245          }
246    
247        # 2. check storage handle(s)
248          my $dbkey = $self->{meta}->{$descent}->{dbKey};
249          if (!$self->{meta}->{$descent}->{storage}) {
250            $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not access storage ( descent='$descent', dbKey='$dbkey' ) - configuration-error?" );
251            next;
252          }
253        
254        # 2.b check storage handle type
255          my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type};
256          if (!$dbType) {
257            $logger->critical( __PACKAGE__ . "->touchNodeSet: Storage ( descent='$descent', dbKey='$dbkey' ) has no 'dbType' - configuration-error?" );
258            next;
259          }
260    
261        # 3. check if descents (and nodes?) are actually available....
262          # TODO:
263          # eventually pre-check mode of access-attempt (read/write) here to provide an "early-croak" if possible
264        
265        # trace
266          # print Dumper($self->{meta}->{$descent}->{storage}->{locator});
267    
268    
269          my $nodeName = $self->{meta}->{$descent}->{nodeName};
270          my $accessorType = $self->{meta}->{$descent}->{accessorType};
271          my $accessorName = $self->{meta}->{$descent}->{accessorName};
272    
273    
274        # 4. check nodeset
275    
276        # debug message containing database type and used/determined accessor name
277        $logger->debug( __PACKAGE__ . "->touchNodeSet: Accessing dbType=$dbType, accessorName=$accessorName" );
278        
279        # if target node(s) do(es) not exist, check if we should create it automagically
280        if ($dbType ne 'DBI' && !$self->{meta}->{$descent}->{storage}->existsChildNode($accessorName)) {
281    
282          if ($descent eq 'target' && $self->{options}->{target}->{autocreateFolders}) {
283            if (!$self->{meta}->{$descent}->{storage}->createChildNode($accessorName)) {
284              $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not create node '$self->{meta}->{$descent}->{nodeName}\@$self->{meta}->{$descent}->{dbKey}' [$self->{meta}->{$descent}->{nodeType}]." );
285              next;
286            }
287          } else {
288            $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not reach node \"$nodeName\" (accessorName=$accessorName, accessorType=$accessorType) at descent \"$descent\"" );
289            next;
290          }
291        }
292        
293      }
294    
295      # trace
296        #print Dumper($self->{meta});
297        #exit;
298    
299      
300      return 1;
301    
302    }
303    
304    
305    
306    sub _modifyNode {
307      my $self = shift;
308      my $descent = shift;
309      my $action = shift;
310      my $map = shift;
311      my $crit = shift;
312    
313      # map for new style callbacks
314      my $map_callbacks = {};
315    
316      # checks go first!
317      
318        # TODO: this should be reviewed first - before extending  ;-)
319        # TODO: this should be extended:
320        # count this cases inside the caller to this sub and provide a better overall message
321        # if this counts still zero in the end:
322        #     "No nodes have been touched for modify: Do you have column-headers in your csv file?"
323        if (not defined $self->{node}) {
324          #$logger->critical( __PACKAGE__ . "->_modifyNode failed: \"$descent\" node is empty." );
325          #return;
326        }
327    
328      # transfer callback nodes from value map to callback map - handle them afterwards! - (new style callbacks)
329      if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {
330        foreach my $callback (keys %{$callbacks->{write}}) {
331          $map_callbacks->{write}->{$callback} = $map->{$callback};
332          delete $map->{$callback};
333        }
334      }
335      
336      
337      # trace
338        #print Dumper($self->{meta});
339    
340    
341      # --------------------------------------------------------------------------
342      # DBI speaks SQL
343      if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') {
344    
345        # trace
346          #print Dumper($map);
347          #delete $map->{cs};
348    
349        # transfer data
350          # TODO: wrap this around '$storageHandle->sendQuery(...)'!?
351          my $sql_main;
352          if (lc($action) eq 'insert') {
353            $sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_INSERT');
354          } elsif (lc $action eq 'update') {
355            $crit ||= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'";
356            $sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_UPDATE', $crit);
357          }
358          my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main);
359    
360        # handle errors
361          if ($sqlHandle->err) {
362            #if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
363            $self->{node}->{status}->{error} = {
364              statement => $sql_main,
365              state => $sqlHandle->state,
366              err => $sqlHandle->err,
367              errstr => $sqlHandle->errstr,
368            };
369          } else {
370            $self->{node}->{status}->{ok} = 1;
371          }
372    
373    
374      # --------------------------------------------------------------------------
375      # Tangram does it the oo-way (naturally)
376      } elsif ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'Tangram') {
377        my $sql_main;
378        my $object;
379    
380        # determine classname
381        my $classname = $self->{meta}->{$descent}->{nodeType};
382        
383        # attributes/properties to exclude
384          # push declared ones from metadata
385          my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}};
386          # push the attributes associated with the identifier
387          if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) {
388            push @exclude, $identProvider->{arg};
389          }
390    
391        # trace
392          #print Dumper($self->{meta});
393          #exit;
394    
395        # new feature:
396        #     - check TypeProvider metadata property from other side
397        #     - use argument (arg) inside as a classname for object creation on this side
398        #my $otherSide = $self->_otherSide($descent);
399        if (my $typeProvider = $self->{meta}->{$descent}->{TypeProvider}) {
400          #print Dumper($map);
401          $classname = $map->{$typeProvider->{arg}};
402          # remove nodes from map also (push nodes to "subnodes_exclude" list)
403          push @exclude, $typeProvider->{arg};
404        }
405        
406        # exclude banned properties (remove from map)
407        #map { delete $self->{node}->{map}->{$_} } @{$self->{args}->{exclude}};
408        map { delete $map->{$_} } @exclude;
409    
410        # list of properties
411        my @props = keys %{$map};
412    
413        # transfer data
414        if (lc $action eq 'insert') {
415    
416          # make the object persistent in four steps:
417          #   - raw create (perl / class tangram scope)
418          #   - orm insert (tangram scope)   ... this establishes inheritance - don't try to fill in inherited properties before!
419          #      is this a Tangram bug?
420          #   - raw fill-in from hash (perl scope)
421          #   - orm update (tangram scope)  ... this updates all properties just filled in
422          
423          
424          # ==========================
425          # TODO: REVIEW HERE!!!
426          # can't we achieve this more elegant?
427          #   o use DesignPattern::Object???
428          #   o use Hash::Merge!!! (take care about the cloning behaviour)
429          
430            # check if object exists (is classname a valid perl package/module?)
431    
432              # we can just check if the classname is valid here
433              if (!$classname) {
434                $logger->critical( __PACKAGE__ . "->_modifyNode: classname is undefined" );
435                # FIXME: stop syncing here?
436                return;
437              }
438            
439              # try to match against the classes known by Class::Tangram
440              # FIXME: do "/i" on win32 only!
441              my $classname_find = quotemeta($classname);
442              if (!grep(m/$classname_find/i, Class::Tangram::known_classes())) {
443                $logger->critical( __PACKAGE__ . "->_modifyNode: Classname '$classname' is not known by Class::Tangram" );
444                # FIXME: stop syncing here?
445                return;
446              }
447          
448            # create new object ...
449              # V1
450                # build array to initialize object
451                #my @initarray = ();
452                #map { push @initarray, $_, undef; } @props;
453                #my $object = $classname->new( @initarray );
454              # V2
455                $object = $classname->new();
456              # V3
457                # $object = DesignPattern::Object->new($data);
458    
459            # ... pass to orm first ...
460            $self->{meta}->{$descent}->{storage}->insert($object);
461      
462            # ... and initialize with empty (undef'd) properties afterwards.
463            map { $object->{$_} = undef; } @props;
464      
465            # trace
466              #print "\n";
467              #print Dumper($map);
468              #print Dumper($object);
469              #exit;
470    
471            # mix in (merge) values ...
472              # TODO: use Hash::Merge here? benchmark!
473              # no! we'd need a Object::Merge here! it's *...2object*
474              hash2object($object, $map);
475      
476            # trace
477              #print Dumper($object);
478              #exit;
479    
480          # TODO: REVIEW HERE!!!
481          # ==========================
482    
483          # ... and re-update@orm.
484            $self->{meta}->{$descent}->{storage}->update($object);
485    
486          # asymmetry: get ident after insert
487          # TODO:
488          #   - just do this if it is an IdentAuthority
489          #   - use IdentProvider metadata here
490    #print Dumper($self->{meta}->{$descent});
491          my $oid = $self->{meta}->{$descent}->{storage}->id($object);
492    #print "oid: $oid", "\n";
493          $self->{node}->{$descent}->{ident} = $oid;
494    
495    
496        } elsif (lc $action eq 'update') {
497          
498          # get fresh object from orm first
499          $object = $self->{meta}->{$descent}->{storage}->load($self->{node}->{$descent}->{ident});
500    
501    #print Dumper($self->{node});
502          
503          # mix in values
504            #print Dumper($object);
505            # TODO: use Hash::Merge here???
506            hash2object($object, $map);
507            #print Dumper($object);
508            #exit;
509    
510          # update orm
511            $self->{meta}->{$descent}->{storage}->update($object);
512            
513        }
514    
515    #exit;
516        
517        my $error = 0;
518    
519        # handle new style callbacks - this is a HACK - do this without an eval!
520        #print Dumper($map);
521        #print "cb: ", Dumper($self->{meta}->{$descent}->{Callback});
522        #print Dumper($map_callbacks);
523        foreach my $node (keys %{$map_callbacks->{write}}) {
524          #print Dumper($node);
525    
526          # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
527          my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $node . '_write';
528          my $evalstring = $perl_callback . '( { object => $object, value => $map_callbacks->{write}->{$node}, storage => $self->{meta}->{$descent}->{storage} } );';
529          #print $evalstring, "\n"; exit;
530          eval($evalstring);
531          if ($@) {
532            $error = 1;
533            $logger->error( __PACKAGE__ . "->_modifyNode: $@" );
534            next;
535          }
536          # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
537          
538          #print "after eval", "\n";
539          
540          if (!$error) {
541            # re-update@orm
542            $self->{meta}->{$descent}->{storage}->update($object);
543          }
544        }
545      
546        # handle errors
547        if ($error) {
548          #print "error", "\n";
549    =pod
550          my $sqlHandle;
551          #if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
552          $self->{node}->{status}->{error} = {
553            statement => $sql_main,
554            state => $sqlHandle->state,
555            err => $sqlHandle->err,
556            errstr => $sqlHandle->errstr,
557          };
558    =cut
559          # rollback....
560          #print "rollback", "\n";
561          $self->{meta}->{$descent}->{storage}->erase($object);
562          #print "after rollback", "\n";
563        } else {
564          $self->{node}->{status}->{ok} = 1;
565        }
566    
567      }
568    
569    }
570    
571    sub _erase_all {
572      my $self = shift;
573      my $descent = shift;
574      #my $node = shift;
575      #print Dumper($self->{meta}->{$descent});
576      #my $node = $self->{meta}->{$descent}->{nodeName};
577      my $node = $self->{meta}->{$descent}->{accessorName};
578      $logger->debug( __PACKAGE__ . "->_erase_all( node $node )" );
579      $self->{meta}->{$descent}->{storage}->eraseAll($node);
580    }
581    
582  1;  1;
583    __END__
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