X-Git-Url: http://git.indexdata.com/?p=irspy-moved-to-github.git;a=blobdiff_plain;f=lib%2FZOOM%2FIRSpy.pm;h=6f5b92ad39f1b735fa980e947826d88f8f6429cd;hp=35257c5fbe690ba28c42aacafd434df57ff2e13e;hb=d94a776fcf0b56a3ffcdcf40f1a60ef350a1d412;hpb=98e1b463226f2d2db251faf427a7852210509caf diff --git a/lib/ZOOM/IRSpy.pm b/lib/ZOOM/IRSpy.pm index 35257c5..6f5b92a 100644 --- a/lib/ZOOM/IRSpy.pm +++ b/lib/ZOOM/IRSpy.pm @@ -1,4 +1,4 @@ -# $Id: IRSpy.pm,v 1.24 2006-10-10 13:16:31 mike Exp $ +# $Id: IRSpy.pm,v 1.73 2007-03-01 14:00:50 mike Exp $ package ZOOM::IRSpy; @@ -6,13 +6,22 @@ use 5.008; use strict; use warnings; -use Data::Dumper; # For debugging only +use Data::Dumper; # For debugging only +use File::Basename; +use XML::LibXSLT; +use XML::LibXML; +use XML::LibXML::XPathContext; +use ZOOM; +use Net::Z3950::ZOOM 1.13; # For the ZOOM version-check only use ZOOM::IRSpy::Node; use ZOOM::IRSpy::Connection; use ZOOM::IRSpy::Record; +use ZOOM::IRSpy::Stats; +use ZOOM::IRSpy::Utils qw(cql_target); our @ISA = qw(); our $VERSION = '0.02'; +our $irspy_to_zeerex_xsl = dirname(__FILE__) . '/../../xsl/irspy2zeerex.xsl'; # Enumeration for callback functions to return @@ -21,6 +30,7 @@ sub OK { 29 } # No problems, task is still progressing sub TASK_DONE { 18 } # Task is complete, next task should begin sub TEST_GOOD { 8 } # Whole test is complete, and succeeded sub TEST_BAD { 31 } # Whole test is complete, and failed +sub TEST_SKIPPED { 12 } # Test couldn't be run package ZOOM::IRSpy; @@ -32,7 +42,9 @@ ZOOM::IRSpy - Perl extension for discovering and analysing IR services use ZOOM::IRSpy; $spy = new ZOOM::IRSpy("target/string/for/irspy/database"); - print $spy->report_status(); + $spy->targets(@targets); + $spy->initialise(); + $res = $spy->check("Main"); =head1 DESCRIPTION @@ -44,10 +56,11 @@ protocols. It is a successor to the ZSpy program. BEGIN { ZOOM::Log::mask_str("irspy"); - ZOOM::Log::mask_str("irspy_test"); ZOOM::Log::mask_str("irspy_debug"); ZOOM::Log::mask_str("irspy_event"); ZOOM::Log::mask_str("irspy_unhandled"); + ZOOM::Log::mask_str("irspy_test"); + ZOOM::Log::mask_str("irspy_task"); } sub new { @@ -61,12 +74,22 @@ sub new { my $conn = new ZOOM::Connection($dbname, 0, @options) or die "$0: can't connection to IRSpy database 'dbname'"; + my $xslt = new XML::LibXSLT; + + $xslt->register_function($ZOOM::IRSpy::Utils::IRSPY_NS, 'strcmp', + \&ZOOM::IRSpy::Utils::xslt_strcmp); + + my $libxml = new XML::LibXML; + my $xsl_doc = $libxml->parse_file($irspy_to_zeerex_xsl); + my $irspy_to_zeerex_style = $xslt->parse_stylesheet($xsl_doc); + my $this = bless { conn => $conn, - allrecords => 1, # unless overridden by targets() - query => undef, # filled in later + query => "cql.allRecords=1", # unless overridden targets => undef, # filled in later connections => undef, # filled in later + libxml => $libxml, + irspy_to_zeerex_style => $irspy_to_zeerex_style, tests => [], # stack of tests currently being executed }, $class; $this->log("irspy", "starting up with database '$dbname'"); @@ -81,6 +104,14 @@ sub log { } +sub find_targets { + my $this = shift(); + my($query) = @_; + + $this->{query} = $query; +} + + # Explicitly nominate a set of targets to check, overriding the # default which is to re-check everything in the database. Each # target already in the database results in the existing record being @@ -92,7 +123,6 @@ sub targets { $this->log("irspy", "setting explicit list of targets ", join(", ", map { "'$_'" } @targets)); - $this->{allrecords} = 0; my @qlist; foreach my $target (@targets) { my($host, $port, $db, $newtarget) = _parse_target_string($target); @@ -100,7 +130,7 @@ sub targets { $this->log("irspy_debug", "rewriting '$target' to '$newtarget'"); $target = $newtarget; # This is written through the ref } - push @qlist, (qq[(host="$host" and port="$port" and path="$db")]); + push @qlist, cql_target($host, $port, $db); } $this->{targets} = \@targets; @@ -125,37 +155,16 @@ sub _parse_target_string { } -# There are two cases. -# -# 1. A specific set of targets is nominated on the command line. -# - Records must be fetched for those targets that are in the DB -# - New, empty records must be made for those that are not. -# - Updated records written to the DB may or may not be new. -# -# 2. All records in the database are to be checked. -# - Records must be fetched for all targets in the DB -# - Updated records written to the DB may not be new. -# -# That's all -- what could be simpler? +# Records must be fetched for all records satisfying $this->{query} If +# $this->{targets} is already set (i.e. a specific list of targets to +# check was specified by a call to targets()), then new, empty records +# must be made for any targets that are not already in the database. # sub initialise { my $this = shift(); my %target2record; - if ($this->{allrecords}) { - # We need to check on every target in the database, which - # means we need to do a "find all". According to the BIB-1 - # semantics document at - # http://www.loc.gov/z3950/agency/bib1.html - # the query - # @attr 2=103 @attr 1=1035 x - # should find all records, but it seems that Zebra doesn't - # support this. Furthermore, when using the "alvis" filter - # (as we do for IRSpy) it doesn't support the use of any BIB-1 - # access point -- not even 1035 "everywhere" -- so instead we - # hack together a search that we know will find all records. - $this->{query} = "port=?*"; - } else { + if ($this->{targets}) { # Prepopulate the target map with nulls so that after we fill # in what we can from the database query, we know which target # IDs we need new records for. @@ -163,36 +172,37 @@ sub initialise { $target2record{lc($target)} = undef; } } + delete $this->{targets}; # Information now in keys of %target2record - $this->log("irspy_debug", "query '", $this->{query}, "'"); my $rs = $this->{conn}->search(new ZOOM::Query::CQL($this->{query})); - delete $this->{query}; # No longer needed at all - $this->log("irspy_debug", "found ", $rs->size(), " target records"); + $this->log("irspy", "'", $this->{query}, "' found ", + $rs->size(), " target records"); + delete $this->{query}; # Information now in $rs + foreach my $i (1 .. $rs->size()) { my $target = _render_record($rs, $i-1, "id"); my $zeerex = _render_record($rs, $i-1, "zeerex"); - #print STDERR "making '$target' record with '$zeerex'\n"; $target2record{lc($target)} = new ZOOM::IRSpy::Record($this, $target, $zeerex); - push @{ $this->{targets} }, $target - if $this->{allrecords}; } # Make records for targets not previously in the database foreach my $target (keys %target2record) { - my $record = $target2record{$target}; - if (!defined $record) { - $this->log("irspy_debug", "made new record for '$target'"); + if (!defined $target2record{$target}) { $target2record{$target} = new ZOOM::IRSpy::Record($this, $target); + $this->log("irspy_debug", "made new record for '$target'"); } else { $this->log("irspy_debug", "using existing record for '$target'"); } } my @connections; - foreach my $target (@{ $this->{targets} }) { - my $conn = new ZOOM::IRSpy::Connection($this, $target, 0, async => 1); + my @targets = sort keys %target2record; + foreach my $target (@targets) { + my $conn = create ZOOM::IRSpy::Connection($this, async => 1); + $conn->option(host => $target); my $record = delete $target2record{lc($target)}; + die "record undefined for '$target'" if !defined $record; $conn->record($record); push @connections, $conn; } @@ -202,7 +212,6 @@ sub initialise { if %target2record; $this->{connections} = \@connections; - delete $this->{targets}; # The information is now in {connections} } @@ -220,38 +229,91 @@ sub _render_record { } -sub _rewrite_records { +sub _irspy_to_zeerex { my $this = shift(); + my($conn, $save_xml) = @_; + my $irspy_doc = $conn->record()->{zeerex}->ownerDocument; + + if ($save_xml) { + unlink('/tmp/irspy_orig.xml'); + open FH, '>/tmp/irspy_orig.xml' + or die "can't write irspy_orig.xml: $!"; + print FH $irspy_doc->toString(); + close FH; + } + my %params = (); + my $result = $this->{irspy_to_zeerex_style}->transform($irspy_doc, %params); + if ($save_xml) { + unlink('/tmp/irspy_transformed.xml'); + open FH, '>/tmp/irspy_transformed.xml' + or die "can't write irspy_transformed.xml: $!"; + print FH $result->toString(); + close FH; + } - # Write modified records back to database - foreach my $conn (@{ $this->{connections} }) { - my $rec = $conn->record(); - my $p = $this->{conn}->package(); - $p->option(action => "specialUpdate"); - my $xml = $rec->{zeerex}->toString(); - $p->option(record => $xml); - $p->send("update"); - $p->destroy(); - - $p = $this->{conn}->package(); - $p->send("commit"); - $p->destroy(); - if (0) { - $xml =~ s/&/&/g; - $xml =~ s//>/g; - print "Updated with xml=
\n
$xml
\n"; - } + return $result->documentElement(); +} + + +sub _rewrite_record { + my $this = shift(); + my($conn) = @_; + + $conn->log("irspy", "rewriting XML record"); + my $rec = $this->_irspy_to_zeerex($conn, $ENV{IRSPY_SAVE_XML}); + _really_rewrite_record($this->{conn}, $rec); +} + + +sub _really_rewrite_record { + my($conn, $rec) = @_; + + my $p = $conn->package(); + $p->option(action => "specialUpdate"); + my $xml = $rec->toString(); + $p->option(record => $xml); + $p->send("update"); + $p->destroy(); + + $p = $conn->package(); + $p->send("commit"); + $p->destroy(); + if (0) { + $xml =~ s/&/&/g; + $xml =~ s//>/g; + print "Updated $conn with xml=
\n
$xml
\n"; } } -# New approach: -# 1. Gather declarative information about test hierarchy. -# 2. For each connection, start the initial test -- invokes run(). -# 3. Run each connection's first queued task. -# 4. while (1) { wait() }. Callbacks return a ZOOM::IRSpy::Status value -# No individual test ever calls wait: tests just set up tasks. +# The approach: gather declarative information about test hierarchy, +# then go into a loop. In the loop, we ensure that each connection is +# running a test, and within that test a task, until its list of tests +# is exhausted. No individual test ever calls wait(): tests just queue +# up tasks and return immediately. When the tasks are run (one at a +# time on each connection) they generate events, and it is these that +# are harvested by ZOOM::event(). Since each connection knows what +# task it is running, it can invoke the appropriate callbacks. +# Callbacks return a ZOOM::IRSpy::Status value which tells the main +# loop how to continue. +# +# Invariants: +# While a connection is running a task, its current_task() +# points at the task structure. When it finishes its task, +# next_task() is pointed at the next task to execute (if there +# is one), and its current_task() is set to zero. When the next +# task is executed, the connection's next_task() is set to zero +# and its current_task() pointed to the task structure. +# current_task() and next_task() are both zero only when there +# are no more queued tasks, which is when a new test is +# started. +# +# Each connection's current test is stored in its +# "current_test_address" option. The next test to execute is +# calculated by walking the declarative tree of tests. This +# option begins empty; the "next test" after this is of course +# the root test. # sub check { my $this = shift(); @@ -259,138 +321,225 @@ sub check { $tname = "Main" if !defined $tname; $this->{tree} = $this->_gather_tests($tname) - or die "No tests defined"; + or die "No tests defined for '$tname'"; + $this->{tree}->resolve(); #$this->{tree}->print(0); + my $nskipped = 0; my @conn = @{ $this->{connections} }; - foreach my $conn (@conn) { - $this->_start_test($conn, ""); - } - while ((my $i0 = ZOOM::event(\@conn)) != 0) { + my $nruns = 0; + ROUND_AND_ROUND_WE_GO: + while (1) { + my @copy_conn = @conn; # avoid alias problems after splice() + my $nconn = scalar(@copy_conn); + foreach my $i0 (0 .. $#copy_conn) { + my $conn = $copy_conn[$i0]; + #print "connection $i0 of $nconn/", scalar(@conn), " is $conn\n"; + if (!$conn->current_task()) { + if (!$conn->next_task()) { + # Out of tasks: we need a new test + NEXT_TEST: + my $address = $conn->option("current_test_address"); + my $nextaddr; + if (!defined $address) { + $nextaddr = ""; + } else { + $this->log("irspy_test", + "checking for next test after '$address'"); + $nextaddr = $this->_next_test($address); + } + if (!defined $nextaddr) { + $conn->log("irspy", "has no more tests: removing"); + ### Does this go wrong if two connections are exhausted? + splice @conn, $i0, 1; + $this->_rewrite_record($conn); + $conn->option(rewrote_record => 1); + next; + } + + my $node = $this->{tree}->select($nextaddr) + or die "invalid nextaddr '$nextaddr'"; + $conn->option(current_test_address => $nextaddr); + my $tname = $node->name(); + $conn->log("irspy_test", + "starting test '$nextaddr' = $tname"); + my $tasks = $conn->tasks(); + my $oldcount = @$tasks; + "ZOOM::IRSpy::Test::$tname"->start($conn); + $tasks = $conn->tasks(); + if (@$tasks > $oldcount) { + # Prepare to start the first of the newly added tasks + $conn->next_task($tasks->[$oldcount]); + } else { + $conn->log("irspy_task", + "no tasks added by new test $tname"); + goto NEXT_TEST; + } + } + + my $task = $conn->next_task(); + die "no next task queued for $conn" if !defined $task; + $conn->log("irspy_task", "preparing task $task"); + $conn->next_task(0); + $conn->current_task($task); + $task->run(); + } + } + + NEXT_EVENT: + my $i0 = ZOOM::event(\@conn); + $this->log("irspy_event", + "ZOOM_event(", scalar(@conn), " connections) = $i0"); + if ($i0 < 1) { + my %messages = ( + 0 => "no events remain", + -1 => "ZOOM::event() argument not a reference", + -2 => "ZOOM::event() reference not an array", + -3 => "no connections remain", + -4 => "too many connections for ZOOM::event()", + ); + my $message = $messages{$i0} || "ZOOM::event() returned $i0"; + $this->log("irspy", $message); + last; + } + my $conn = $conn[$i0-1]; my $ev = $conn->last_event(); my $evstr = ZOOM::event_str($ev); $conn->log("irspy_event", "event $ev ($evstr)"); + goto NEXT_EVENT if $ev != ZOOM::Event::ZEND; my $task = $conn->current_task(); + die "$conn has no current task for event $ev ($evstr)" if !$task; + my $res; - eval { - $conn->_check(); - }; if ($@) { - # An error in, say, a search response, becomes visible to - # ZOOM before the Receive Data event is sent and persists - # until after the End, which means that successive events - # each report the same error. So we just ignore errors on - # "unimportant" events. ### But this doesn't work for, - # say, a Connection Refused, as the only event that shows - # us this error is the End. - if ($ev == ZOOM::Event::RECV_DATA || - $ev == ZOOM::Event::RECV_APDU || - $ev == ZOOM::Event::ZEND) { - $conn->log("irspy_event", "ignoring error ", - "on event $ev ($evstr): $@"); - } else { - my $sub = $task->{cb}->{exception}; - die $@ if !defined $sub; - $res = &$sub($conn, $task, $@); - goto HANDLE_RESULT; + eval { $conn->check() }; + if ($@ && ref $@ && $@->isa("ZOOM::Exception")) { + my $sub = $task->{cb}->{exception}; + die $@ if !defined $sub; + $res = &$sub($conn, $task, $task->udata(), $@); + } elsif ($@) { + die "Unexpected non-ZOOM exception: " . ref($@) . " ($@)"; + } else { + my $sub = $task->{cb}->{$ev}; + if (!defined $sub) { + $conn->log("irspy_unhandled", "event $ev ($evstr)"); + next; } - } - my $sub = $task ? $task->{cb}->{$ev} : undef; - if (!defined $sub) { - $conn->log("irspy_unhandled", "event $ev ($evstr)"); - # Catch the case of a pure-container test ending - if ($ev == ZOOM::Event::ZEND && !$conn->current_task()) { - $conn->log("irspy", "last event, no task queued"); - goto NEXT_TEST; - } - next; + $res = &$sub($conn, $task, $task->udata(), $ev); } - $res = &$sub($conn, $task, $ev); - HANDLE_RESULT: if ($res == ZOOM::IRSpy::Status::OK) { # Nothing to do -- life continues } elsif ($res == ZOOM::IRSpy::Status::TASK_DONE) { my $task = $conn->current_task(); - die "can't happen" if !$task; - $conn->log("irspy", "completed task $task"); - my $nexttask = $task->{next}; - if (defined $nexttask) { - $conn->log("irspy_debug", "next task is '$nexttask'"); - $conn->start_task($nexttask); - } else { - $conn->log("irspy_debug", "jumping to NEXT_TEST"); - $conn->current_task(0); - goto NEXT_TEST; + die "no task for TASK_DONE on $conn" if !$task; + die "next task already defined for $conn" if $conn->next_task(); + $conn->log("irspy_task", "completed task $task"); + $conn->next_task($task->{next}); + $conn->current_task(0); + + } elsif ($res == ZOOM::IRSpy::Status::TEST_GOOD || + $res == ZOOM::IRSpy::Status::TEST_BAD) { + my $x = ($res == ZOOM::IRSpy::Status::TEST_GOOD) ? "good" : "bad"; + $conn->log("irspy_task", "test ended during task $task ($x)"); + $conn->log("irspy_test", "test completed ($x)"); + $conn->current_task(0); + $conn->next_task(0); + if ($res == ZOOM::IRSpy::Status::TEST_BAD) { + my $address = $conn->option('current_test_address'); + $conn->log("irspy", "top-level test failed!") + if $address eq ""; + my $node = $this->{tree}->select($address); + my $skipcount = 0; + while (defined $node->next() && + length($node->next()->address()) >= length($address)) { + $conn->log("irspy_debug", "skipping from '", + $node->address(), "' to '", + $node->next()->address(), "'"); + $node = $node->next(); + $skipcount++; + } + + $conn->option(current_test_address => $node->address()); + $conn->log("irspy_test", "skipped $skipcount tests"); + $nskipped += $skipcount; } - } elsif ($res == ZOOM::IRSpy::Status::TEST_GOOD) { - $conn->log("irspy", "test completed (GOOD)"); - NEXT_TEST: - my $address = $conn->option("address"); - my $nextaddr = $this->_next_test($address); - if (defined $nextaddr) { - $this->_start_test($conn, $nextaddr); - } else { - $conn->log("irspy", "has no tests after '$address'"); - # Nothing else to do: we will get no more meaningful - # events on this connection, and when all the - # connections have reached this state, ZOOM::event() - # will return 0 and we will fall out of the loop. - } + } elsif ($res == ZOOM::IRSpy::Status::TEST_SKIPPED) { + $conn->log("irspy_test", "test skipped during task $task"); + $conn->current_task(0); + $conn->next_task(0); + $nskipped++; - } elsif ($res == ZOOM::IRSpy::Status::TEST_BAD) { - $conn->log("irspy", "test completed (BAD)"); - ### Should skip over remaining sibling tests - goto NEXT_TEST; + } else { + die "unknown callback return-value '$res'"; } } - $this->log("irspy_event", "ZOOM::event() returned 0"); - - #$this->_rewrite_records(); - return 0; # What does this mean? -} - + $this->log("irspy", "exiting main loop"); + # Sanity checks: none of the following should ever happen + my $finished = 1; + @conn = @{ $this->{connections} }; + foreach my $conn (@conn) { + my $test = $conn->option("current_test_address"); + my $next = $this->_next_test($test); + if (defined $next) { + $this->log("irspy", + "$conn (in test '$test') has queued test '$next'"); + $finished = 0; + } + if (my $task = $conn->current_task()) { + $this->log("irspy", "$conn still has an active task $task"); + $finished = 0; + } + if (my $task = $conn->next_task()) { + $this->log("irspy", "$conn still has a queued task $task"); + $finished = 0; + } + if (!$conn->is_idle()) { + $this->log("irspy", + "$conn still has ZOOM-C level tasks queued: see below"); + $finished = 0; + } + my $ev = $conn->peek_event(); + if ($ev != 0 && $ev != ZOOM::Event::ZEND) { + my $evstr = ZOOM::event_str($ev); + $this->log("irspy", "$conn has event $ev ($evstr) waiting"); + $finished = 0; + } + if (!$conn->option("rewrote_record")) { + $this->log("irspy", "$conn did not rewrite its ZeeRex record"); + $finished = 0; + } + } -# Preconditions: -# - called only when there no tasks remain for the connection -# - called with valid address -sub _start_test { - my $this = shift(); - my($conn, $address) = @_; - { - my $task = $conn->current_task(); - die "_start_test(): $conn already has task $task" - if $task; + # This really shouldn't be necessary, and in practice it rarely + # helps, but it's belt and braces. (For now, we don't do this + # hence the zero in the $nruns check). + if (!$finished) { + if (++$nruns < 0) { + $this->log("irspy", "back into main loop, ${nruns}th time"); + goto ROUND_AND_ROUND_WE_GO; + } else { + $this->log("irspy", "bailing after $nruns main-loop runs"); + } } - my $node = $this->{tree}->select($address) - or die "_start_test(): invalid address '$address'"; - - $conn->option(address => $address); - my $tname = $node->name(); - $conn->log("irspy", " starting test '$address' = $tname"); - - # We will need to find the first of the tasks that are added by - # the test we're about to start, so we can start that task. This - # requires a little trickery: noting the current length of the - # tasks array first, then fetching the next one off the end. - my $alltasks = $conn->tasks(); - my $ntasks = defined $alltasks ? @$alltasks : 0; - my $test = "ZOOM::IRSpy::Test::$tname"->start($conn); - - $alltasks = $conn->tasks(); - if (defined $alltasks && @$alltasks > $ntasks) { - my $task = $alltasks->[$ntasks]; - $conn->start_task($task); - } else { - $this->log("irspy", "no tasks added for test '$address' = $tname"); + # This shouldn't happen emit anything either: + while ((my $i1 = ZOOM::event(\@conn)) > 0) { + my $conn = $conn[$i1-1]; + my $ev = $conn->last_event(); + my $evstr = ZOOM::event_str($ev); + $this->log("irspy", + "$conn still has ZOOM-C level task queued: $ev ($evstr)") + if $ev != ZOOM::Event::ZEND; } + + return $nskipped; } @@ -402,11 +551,15 @@ sub _gather_tests { join(" -> ", @ancestors, $tname)) if grep { $_ eq $tname } @ancestors; + my $slashSeperatedTname = $tname; + $slashSeperatedTname =~ s/::/\//g; + my $fullName = "ZOOM/IRSpy/Test/$slashSeperatedTname.pm"; + eval { - my $slashSeperatedTname = $tname; - $slashSeperatedTname =~ s/::/\//g; - require "ZOOM/IRSpy/Test/$slashSeperatedTname.pm"; + require $fullName; + $this->log("irspy", "successfully required '$fullName'"); }; if ($@) { + $this->log("irspy", "couldn't require '$fullName': $@"); $this->log("warn", "can't load test '$tname': skipping", $@ =~ /^Can.t locate/ ? () : " ($@)"); return undef; @@ -423,12 +576,11 @@ sub _gather_tests { } +# These next three should arguably be Node methods sub _next_test { my $this = shift(); my($address, $omit_child) = @_; - $this->log("irspy", "checking for next test after '$address'"); - # Try first child if (!$omit_child) { my $maybe = $address eq "" ? "0" : "$address:0"; @@ -449,6 +601,38 @@ sub _next_test { } +sub _last_sibling_test { + my $this = shift(); + my($address) = @_; + + return undef + if !defined $this->_next_sibling_test($address); + + my $nskipped = 0; + while (1) { + my $maybe = $this->_next_sibling_test($address); + last if !defined $maybe; + $nskipped++; + $address = $maybe; + $this->log("irspy", "skipping $nskipped tests to '$address'"); + } + + return ($address, $nskipped); +} + + +sub _next_sibling_test { + my $this = shift(); + my($address) = @_; + + my @components = split /:/, $address; + my $last = pop @components; + my $maybe = join(":", @components, $last+1); + return $maybe if $this->{tree}->select($maybe); + return undef; +} + + =head1 SEE ALSO ZOOM::IRSpy::Record,