-# Copyright (C) 2015-2018 all contributors <meta@public-inbox.org>
+# Copyright (C) 2015-2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# based on notmuch, but with no concept of folders, files or flags
#
# Read-only search interface for use by the web and NNTP interfaces
package PublicInbox::Search;
use strict;
-use warnings;
+use parent qw(Exporter);
+our @EXPORT_OK = qw(mdocid);
-# values for searching
-use constant DS => 0; # Date: header in Unix time
-use constant NUM => 1; # NNTP article number
-use constant BYTES => 2; # :bytes as defined in RFC 3977
-use constant LINES => 3; # :lines as defined in RFC 3977
-use constant TS => 4; # Received: header in Unix time
-use constant YYYYMMDD => 5; # for searching in the WWW UI
+# values for searching, changing the numeric value breaks
+# compatibility with old indices (so don't change them it)
+use constant {
+ TS => 0, # Received: header in Unix time (IMAP INTERNALDATE)
+ YYYYMMDD => 1, # Date: header for searching in the WWW UI
+ DT => 2, # Date: YYYYMMDDHHMMSS
-use Search::Xapian qw/:standard/;
-use PublicInbox::SearchMsg;
-use PublicInbox::MIME;
-use PublicInbox::MID qw/id_compress/;
+ # added for public-inbox 1.6.0+
+ BYTES => 3, # IMAP RFC822.SIZE
+ UID => 4, # IMAP UID == NNTP article number == Xapian docid
+ THREADID => 5, # RFC 8474, RFC 8621
-# This is English-only, everything else is non-standard and may be confused as
-# a prefix common in patch emails
-our $REPLY_RE = qr/^re:\s+/i;
-our $LANG = 'english';
+ # TODO
+ # REPLYCNT => ?, # IMAP ANSWERED
-use constant {
# SCHEMA_VERSION history
# 0 - initial
# 1 - subject_path is lower-cased
# 13 - fix threading for empty References/In-Reply-To
# (commit 83425ef12e4b65cdcecd11ddcb38175d4a91d5a0)
# 14 - fix ghost root vivification
- SCHEMA_VERSION => 14,
-
- # n.b. FLAG_PURE_NOT is expensive not suitable for a public website
- # as it could become a denial-of-service vector
- QP_FLAGS => FLAG_PHRASE|FLAG_BOOLEAN|FLAG_LOVEHATE|FLAG_WILDCARD,
+ # 15 - see public-inbox-v2-format(5)
+ # further bumps likely unnecessary, we'll suggest in-place
+ # "--reindex" use for further fixes and tweaks:
+ #
+ # public-inbox v1.5.0 adds (still SCHEMA_VERSION=15):
+ # * "lid:" and "l:" for List-Id searches
+ #
+ # v1.6.0 adds BYTES, UID and THREADID values
+ SCHEMA_VERSION => 15,
};
-# setup prefixes
-my %bool_pfx_internal = (
- type => 'T', # "mail" or "ghost"
- thread => 'G', # newsGroup (or similar entity - e.g. a web forum name)
-);
+use PublicInbox::Smsg;
+use PublicInbox::Over;
+my $QP_FLAGS;
+our %X = map { $_ => 0 } qw(BoolWeight Database Enquire QueryParser Stem);
+our $Xap; # 'Search::Xapian' or 'Xapian'
+my $NVRP; # '$Xap::'.('NumberValueRangeProcessor' or 'NumberRangeProcessor')
+my $ENQ_ASCENDING;
+
+sub load_xapian () {
+ return 1 if defined $Xap;
+ # n.b. PI_XAPIAN is intended for development use only. We still
+ # favor Search::Xapian since that's what's available in current
+ # Debian stable (10.x) and derived distros.
+ for my $x (($ENV{PI_XAPIAN} // 'Search::Xapian'), 'Xapian') {
+ eval "require $x";
+ next if $@;
+
+ $x->import(qw(:standard));
+ $Xap = $x;
+
+ # `version_string' was added in Xapian 1.1
+ my $xver = eval('v'.eval($x.'::version_string()')) //
+ eval('v'.eval($x.'::xapian_version_string()'));
+
+ # NumberRangeProcessor was added in Xapian 1.3.6,
+ # NumberValueRangeProcessor was removed for 1.5.0+,
+ # favor the older /Value/ variant since that's what our
+ # (currently) preferred Search::Xapian supports
+ $NVRP = $x.'::'.($x eq 'Xapian' && $xver ge v1.5 ?
+ 'NumberRangeProcessor' : 'NumberValueRangeProcessor');
+ $X{$_} = $Xap.'::'.$_ for (keys %X);
+
+ # ENQ_ASCENDING doesn't seem exported by SWIG Xapian.pm,
+ # so lets hope this part of the ABI is stable because it's
+ # just an integer:
+ $ENQ_ASCENDING = $x eq 'Xapian' ?
+ 1 : Search::Xapian::ENQ_ASCENDING();
+
+ # for Smsg:
+ *PublicInbox::Smsg::sortable_unserialise =
+ $Xap.'::sortable_unserialise';
+ # n.b. FLAG_PURE_NOT is expensive not suitable for a public
+ # website as it could become a denial-of-service vector
+ # FLAG_PHRASE also seems to cause performance problems chert
+ # (and probably earlier Xapian DBs). glass seems fine...
+ # TODO: make this an option, maybe?
+ # or make indexlevel=medium as default
+ $QP_FLAGS = FLAG_PHRASE() | FLAG_BOOLEAN() | FLAG_LOVEHATE() |
+ FLAG_WILDCARD();
+ return 1;
+ }
+ undef;
+}
+
+# This is English-only, everything else is non-standard and may be confused as
+# a prefix common in patch emails
+our $LANG = 'english';
+# note: the non-X term prefix allocations are shared with
+# Xapian omega, see xapian-applications/omega/docs/termprefixes.rst
my %bool_pfx_external = (
mid => 'Q', # Message-ID (full/exact), this is mostly uniQue
+ lid => 'G', # newsGroup (or similar entity), just inside <>
+ dfpre => 'XDFPRE',
+ dfpost => 'XDFPOST',
+ dfblob => 'XDFPRE XDFPOST',
);
my $non_quoted_body = 'XNQ XDFN XDFA XDFB XDFHH XDFCTX XDFPRE XDFPOST';
# for mairix compatibility
s => 'S',
m => 'XM', # 'mid:' (bool) is exact, 'm:' (prob) can do partial
+ l => 'XL', # 'lid:' (bool) is exact, 'l:' (prob) can do partial
f => 'A',
t => 'XTO',
tc => 'XTO XCC',
dfb => 'XDFB',
dfhh => 'XDFHH',
dfctx => 'XDFCTX',
- dfpre => 'XDFPRE',
- dfpost => 'XDFPOST',
- dfblob => 'XDFPRE XDFPOST',
# default:
'' => 'XM S A XQUOT XFN ' . $non_quoted_body,
);
# not documenting m: and mid: for now, the using the URLs works w/o Xapian
+# not documenting lid: for now, either, it is probably redundant with l:,
+# especially since we don't offer boolean searches for To/Cc/From
+# headers, either
our @HELP = (
's:' => 'match within Subject e.g. s:"a quick brown fox"',
'd:' => <<EOF,
date range as YYYYMMDD e.g. d:19931002..20101002
Open-ended ranges such as d:19931002.. and d:..20101002
are also supported
+EOF
+ 'dt:' => <<EOF,
+date-time range as YYYYMMDDhhmmss (e.g. dt:19931002011000..19931002011200)
EOF
'b:' => 'match within message body, including text attachments',
'nq:' => 'match non-quoted text within message body',
'f:' => 'match within the From header',
'a:' => 'match within the To, Cc, and From headers',
'tc:' => 'match within the To and Cc headers',
+ 'l:' => 'match contents of the List-Id header',
'bs:' => 'match within the Subject and body',
'dfn:' => 'match filename from diff',
'dfa:' => 'match diff removed (-) lines',
);
chomp @HELP;
-my $mail_query = Search::Xapian::Query->new('T' . 'mail');
+sub xdir ($;$) {
+ my ($self, $rdonly) = @_;
+ if ($rdonly || !defined($self->{shard})) {
+ $self->{xpfx};
+ } else { # v2 only:
+ "$self->{xpfx}/$self->{shard}";
+ }
+}
-sub xdir {
+sub _xdb ($) {
my ($self) = @_;
- if ($self->{version} == 1) {
- "$self->{mainrepo}/public-inbox/xapian" . SCHEMA_VERSION;
+ my $dir = xdir($self, 1);
+ my ($xdb, $slow_phrase);
+ my $qpf = \($self->{qp_flags} ||= $QP_FLAGS);
+ if ($self->{ibx_ver} >= 2) {
+ my @xdb;
+ opendir(my $dh, $dir) or return; # not initialized yet
+
+ # We need numeric sorting so shard[0] is first for reading
+ # Xapian metadata, if needed
+ for (sort { $a <=> $b } grep(/\A[0-9]+\z/, readdir($dh))) {
+ my $shard_dir = "$dir/$_";
+ if (-d $shard_dir && -r _) {
+ push @xdb, $X{Database}->new($shard_dir);
+ $slow_phrase ||= -f "$shard_dir/iamchert";
+ } else { # gaps from missing epochs throw off mdocid()
+ warn "E: $shard_dir missing or unreadable\n";
+ return;
+ }
+ }
+ $self->{nshard} = scalar(@xdb);
+ $xdb = shift @xdb;
+ $xdb->add_database($_) for @xdb;
} else {
- my $dir = "$self->{mainrepo}/xap" . SCHEMA_VERSION;
- my $part = $self->{partition};
- defined $part or die "partition not given";
- $dir .= "/$part";
+ $slow_phrase = -f "$dir/iamchert";
+ $xdb = $X{Database}->new($dir);
}
+ $$qpf |= FLAG_PHRASE() unless $slow_phrase;
+ $xdb;
}
-sub new {
- my ($class, $mainrepo, $altid) = @_;
- my $version = 1;
- my $ibx = $mainrepo;
- if (ref $ibx) {
- $version = $ibx->{version} || 1;
- $mainrepo = $ibx->{mainrepo};
+# v2 Xapian docids don't conflict, so they're identical to
+# NNTP article numbers and IMAP UIDs.
+# https://trac.xapian.org/wiki/FAQ/MultiDatabaseDocumentID
+sub mdocid {
+ my ($nshard, $mitem) = @_;
+ my $docid = $mitem->get_docid;
+ int(($docid - 1) / $nshard) + 1;
+}
+
+sub mset_to_artnums {
+ my ($self, $mset) = @_;
+ my $nshard = $self->{nshard} // 1;
+ [ map { mdocid($nshard, $_) } $mset->items ];
+}
+
+sub xdb ($) {
+ my ($self) = @_;
+ $self->{xdb} ||= do {
+ load_xapian();
+ _xdb($self);
+ };
+}
+
+sub xpfx_init ($) {
+ my ($self) = @_;
+ if ($self->{ibx_ver} == 1) {
+ $self->{xpfx} .= '/public-inbox/xapian' . SCHEMA_VERSION;
+ } else {
+ $self->{xpfx} .= '/xap'.SCHEMA_VERSION;
}
+}
+
+sub new {
+ my ($class, $ibx) = @_;
+ ref $ibx or die "BUG: expected PublicInbox::Inbox object: $ibx";
my $self = bless {
- mainrepo => $mainrepo,
- altid => $altid,
- version => $version,
+ xpfx => $ibx->{inboxdir}, # for xpfx_init
+ altid => $ibx->{altid},
+ ibx_ver => $ibx->version,
}, $class;
- if ($version >= 2) {
- my $dir = "$self->{mainrepo}/xap" . SCHEMA_VERSION;
- my $xdb;
- my $parts = 0;
- foreach my $part (<$dir/*>) {
- -d $part && $part =~ m!/\d+\z! or next;
- $parts++;
- my $sub = Search::Xapian::Database->new($part);
- if ($xdb) {
- $xdb->add_database($sub);
- } else {
- $xdb = $sub;
- }
- }
- $self->{xdb} = $xdb;
- $self->{skel} = Search::Xapian::Database->new("$dir/skel");
- } else {
- $self->{xdb} = Search::Xapian::Database->new($self->xdir);
- }
+ xpfx_init($self);
+ my $dir = xdir($self, 1);
+ $self->{over_ro} = PublicInbox::Over->new("$dir/over.sqlite3");
$self;
}
sub reopen {
my ($self) = @_;
- $self->{xdb}->reopen;
- if (my $skel = $self->{skel}) {
- $skel->reopen;
+ if (my $xdb = $self->{xdb}) {
+ $xdb->reopen;
}
$self; # make chaining easier
}
# read-only
sub query {
my ($self, $query_string, $opts) = @_;
- my $query;
-
$opts ||= {};
- unless ($query_string eq '') {
- $query = $self->qp->parse_query($query_string, QP_FLAGS);
+ if ($query_string eq '' && !$opts->{mset}) {
+ $self->{over_ro}->recent($opts);
+ } else {
+ my $qp = $self->{qp} //= qparse_new($self);
+ my $qp_flags = $self->{qp_flags};
+ my $query = $qp->parse_query($query_string, $qp_flags);
$opts->{relevance} = 1 unless exists $opts->{relevance};
+ _do_enquire($self, $query, $opts);
}
-
- _do_enquire($self, $query, $opts);
-}
-
-sub get_thread {
- my ($self, $mid, $opts) = @_;
- my $smsg = first_smsg_by_mid($self, $mid) or
- return { total => 0, msgs => [] };
- my $qtid = Search::Xapian::Query->new('G' . $smsg->thread_id);
- my $path = $smsg->path;
- if (defined $path && $path ne '') {
- my $path = id_compress($smsg->path);
- my $qsub = Search::Xapian::Query->new('XPATH' . $path);
- $qtid = Search::Xapian::Query->new(OP_OR, $qtid, $qsub);
- }
- $opts ||= {};
- $opts->{limit} ||= 1000;
-
- # always sort threads by timestamp, this makes life easier
- # for the threading algorithm (in SearchThread.pm)
- $opts->{asc} = 1;
- $opts->{enquire} = enquire_skel($self);
- _do_enquire($self, $qtid, $opts);
}
sub retry_reopen {
- my ($self, $cb) = @_;
- my $ret;
- for (1..10) {
- eval { $ret = $cb->() };
- return $ret unless $@;
+ my ($self, $cb, $arg) = @_;
+ for my $i (1..10) {
+ if (wantarray) {
+ my @ret;
+ eval { @ret = $cb->($arg) };
+ return @ret unless $@;
+ } else {
+ my $ret;
+ eval { $ret = $cb->($arg) };
+ return $ret unless $@;
+ }
# Exception: The revision being read has been discarded -
# you should call Xapian::Database::reopen()
- if (ref($@) eq 'Search::Xapian::DatabaseModifiedError') {
+ if (ref($@) =~ /\bDatabaseModifiedError\b/) {
+ warn "reopen try #$i on $@\n";
reopen($self);
} else {
- warn "ref: ", ref($@), "\n";
+ # let caller decide how to spew, because ExtMsg queries
+ # get wonky and trigger:
+ # "something terrible happened at .../Xapian/Enquire.pm"
die;
}
}
+ die "Too many Xapian database modifications in progress\n";
}
sub _do_enquire {
my ($self, $query, $opts) = @_;
- retry_reopen($self, sub { _enquire_once($self, $query, $opts) });
+ retry_reopen($self, \&_enquire_once, [ $self, $query, $opts ]);
}
-sub _enquire_once {
- my ($self, $query, $opts) = @_;
- my $enquire = $opts->{enquire} || enquire($self);
- if (defined $query) {
- $query = Search::Xapian::Query->new(OP_AND,$query,$mail_query);
- } else {
- $query = $mail_query;
- }
+# returns true if all docs have the THREADID value
+sub has_threadid ($) {
+ my ($self) = @_;
+ (xdb($self)->get_metadata('has_threadid') // '') eq '1';
+}
+
+sub _enquire_once { # retry_reopen callback
+ my ($self, $query, $opts) = @{$_[0]};
+ my $xdb = xdb($self);
+ my $enquire = $X{Enquire}->new($xdb);
$enquire->set_query($query);
$opts ||= {};
my $desc = !$opts->{asc};
- if ($opts->{relevance}) {
+ if (($opts->{mset} || 0) == 2) { # mset == 2: ORDER BY docid/UID
+ $enquire->set_docid_order($ENQ_ASCENDING);
+ $enquire->set_weighting_scheme($X{BoolWeight}->new);
+ } elsif ($opts->{relevance}) {
$enquire->set_sort_by_relevance_then_value(TS, $desc);
- } elsif ($opts->{num}) {
- $enquire->set_sort_by_value(NUM, 0);
} else {
$enquire->set_sort_by_value_then_relevance(TS, $desc);
}
+
+ # `mairix -t / --threads' or JMAP collapseThreads
+ if ($opts->{thread} && has_threadid($self)) {
+ $enquire->set_collapse_key(THREADID);
+ }
+
my $offset = $opts->{offset} || 0;
my $limit = $opts->{limit} || 50;
my $mset = $enquire->get_mset($offset, $limit);
return $mset if $opts->{mset};
- my @msgs = map {
- PublicInbox::SearchMsg->load_doc($_->get_document);
- } $mset->items;
-
- { total => $mset->get_matches_estimated, msgs => \@msgs }
+ my $nshard = $self->{nshard} // 1;
+ my $i = 0;
+ my %order = map { mdocid($nshard, $_) => ++$i } $mset->items;
+ my @msgs = sort {
+ $order{$a->{num}} <=> $order{$b->{num}}
+ } @{$self->{over_ro}->get_all(keys %order)};
+ wantarray ? ($mset->get_matches_estimated, \@msgs) : \@msgs;
}
# read-write
-sub stemmer { Search::Xapian::Stem->new($LANG) }
+sub stemmer { $X{Stem}->new($LANG) }
# read-only
-sub qp {
+sub qparse_new ($) {
my ($self) = @_;
- my $qp = $self->{query_parser};
- return $qp if $qp;
-
- # new parser
- $qp = Search::Xapian::QueryParser->new;
- $qp->set_default_op(OP_AND);
- $qp->set_database($self->{xdb});
- $qp->set_stemmer($self->stemmer);
- $qp->set_stemming_strategy(STEM_SOME);
- $qp->add_valuerangeprocessor(
- Search::Xapian::NumberValueRangeProcessor->new(YYYYMMDD, 'd:'));
+ my $xdb = xdb($self);
+ my $qp = $X{QueryParser}->new;
+ $qp->set_default_op(OP_AND());
+ $qp->set_database($xdb);
+ $qp->set_stemmer(stemmer($self));
+ $qp->set_stemming_strategy(STEM_SOME());
+ my $cb = $qp->can('set_max_wildcard_expansion') //
+ $qp->can('set_max_expansion'); # Xapian 1.5.0+
+ $cb->($qp, 100);
+ $cb = $qp->can('add_valuerangeprocessor') //
+ $qp->can('add_rangeprocessor'); # Xapian 1.5.0+
+ $cb->($qp, $NVRP->new(YYYYMMDD, 'd:'));
+ $cb->($qp, $NVRP->new(DT, 'dt:'));
+
+ # for IMAP, undocumented for WWW and may be split off go away
+ $cb->($qp, $NVRP->new(BYTES, 'bytes:'));
+ $cb->($qp, $NVRP->new(TS, 'ts:'));
+ $cb->($qp, $NVRP->new(UID, 'uid:'));
while (my ($name, $prefix) = each %bool_pfx_external) {
- $qp->add_boolean_prefix($name, $prefix);
+ $qp->add_boolean_prefix($name, $_) foreach split(/ /, $prefix);
}
# we do not actually create AltId objects,
# just parse the spec to avoid the extra DB handles for now.
if (my $altid = $self->{altid}) {
- my $user_pfx = $self->{-user_pfx} ||= [];
+ my $user_pfx = $self->{-user_pfx} = [];
for (@$altid) {
# $_ = 'serial:gmane:/path/to/gmane.msgmap.sqlite3'
+ # note: Xapian supports multibyte UTF-8, /^[0-9]+$/,
+ # and '_' with prefixes matching \w+
/\Aserial:(\w+):/ or next;
my $pfx = $1;
push @$user_pfx, "$pfx:", <<EOF;
while (my ($name, $prefix) = each %prob_prefix) {
$qp->add_prefix($name, $_) foreach split(/ /, $prefix);
}
-
- $self->{query_parser} = $qp;
-}
-
-sub num_range_processor {
- $_[0]->{nrp} ||= Search::Xapian::NumberValueRangeProcessor->new(NUM);
-}
-
-# only used for NNTP server
-sub query_xover {
- my ($self, $beg, $end, $offset) = @_;
- my $qp = Search::Xapian::QueryParser->new;
- $qp->set_database($self->{skel} || $self->{xdb});
- $qp->add_valuerangeprocessor($self->num_range_processor);
- my $query = $qp->parse_query("$beg..$end", QP_FLAGS);
-
- my $opts = {
- enquire => enquire_skel($self),
- num => 1,
- limit => 200,
- offset => $offset,
- };
- _do_enquire($self, $query, $opts);
-}
-
-sub query_ts {
- my ($self, $ts, $opts) = @_;
- my $qp = $self->{qp_ts} ||= eval {
- my $q = Search::Xapian::QueryParser->new;
- $q->set_database($self->{skel} || $self->{xdb});
- $q->add_valuerangeprocessor(
- Search::Xapian::NumberValueRangeProcessor->new(TS));
- $q
- };
- my $query = $qp->parse_query($ts, QP_FLAGS);
- $opts->{enquire} = enquire_skel($self);
- _do_enquire($self, $query, $opts);
-}
-
-sub first_smsg_by_mid {
- my ($self, $mid) = @_;
- my $smsg;
- retry_reopen($self, sub {
- each_smsg_by_mid($self, $mid, sub { $smsg = $_[0]; undef });
- });
- $smsg;
-}
-
-sub lookup_article {
- my ($self, $num) = @_;
- my $term = 'XNUM'.$num;
- my $db = $self->{skel} || $self->{xdb};
- retry_reopen($self, sub {
- my $head = $db->postlist_begin($term);
- my $tail = $db->postlist_end($term);
- return if $head->equal($tail);
- my $doc_id = $head->get_docid;
- return unless defined $doc_id;
- $head->inc;
- if ($head->nequal($tail)) {
- my $loc= $self->{mainrepo} .
- ($self->{skel} ? 'skel' : 'xdb');
- warn "article #$num is not unique in $loc\n";
- }
- # raises on error:
- my $doc = $db->get_document($doc_id);
- my $smsg = PublicInbox::SearchMsg->wrap($doc);
- $smsg->{doc_id} = $doc_id;
- $smsg->load_expand;
- });
-}
-
-sub each_smsg_by_mid {
- my ($self, $mid, $cb) = @_;
- # XXX retry_reopen isn't necessary for V2Writable, but the PSGI
- # interface will need it...
- my $db = $self->{skel} || $self->{xdb};
- my $term = 'Q' . $mid;
- my $head = $db->postlist_begin($term);
- my $tail = $db->postlist_end($term);
- if ($head == $tail) {
- $db->reopen;
- $head = $db->postlist_begin($term);
- $tail = $db->postlist_end($term);
- }
- return ($head, $tail, $db) if wantarray;
- for (; $head->nequal($tail); $head->inc) {
- my $doc_id = $head->get_docid;
- my $doc = $db->get_document($doc_id);
- my $smsg = PublicInbox::SearchMsg->wrap($doc, $mid);
- $smsg->{doc_id} = $doc_id;
- $cb->($smsg) or return;
- }
-}
-
-# normalize subjects so they are suitable as pathnames for URLs
-# XXX: consider for removal
-sub subject_path {
- my $subj = pop;
- $subj = subject_normalized($subj);
- $subj =~ s![^a-zA-Z0-9_\.~/\-]+!_!g;
- lc($subj);
-}
-
-sub subject_normalized {
- my $subj = pop;
- $subj =~ s/\A\s+//s; # no leading space
- $subj =~ s/\s+\z//s; # no trailing space
- $subj =~ s/\s+/ /gs; # no redundant spaces
- $subj =~ s/\.+\z//; # no trailing '.'
- $subj =~ s/$REPLY_RE//igo; # remove reply prefix
- $subj;
-}
-
-sub enquire {
- my ($self) = @_;
- $self->{enquire} ||= Search::Xapian::Enquire->new($self->{xdb});
-}
-
-sub enquire_skel {
- my ($self) = @_;
- if (my $skel = $self->{skel}) {
- $self->{enquire_skel} ||= Search::Xapian::Enquire->new($skel);
- } else {
- enquire($self);
- }
+ $qp;
}
sub help {
my ($self) = @_;
- $self->qp; # parse altids
+ $self->{qp} //= qparse_new($self); # parse altids
my @ret = @HELP;
if (my $user_pfx = $self->{-user_pfx}) {
push @ret, @$user_pfx;