# Copyright (C) 2018-2019 all contributors # License: AGPL-3.0+ # for XOVER, OVER in NNTP, and feeds/homepage/threads in PSGI # Unlike Msgmap, this is an _UNSTABLE_ database which can be # tweaked/updated over time and rebuilt. package PublicInbox::Over; use strict; use warnings; use DBI; use DBD::SQLite; use PublicInbox::SearchMsg; use Compress::Zlib qw(uncompress); use constant DEFAULT_LIMIT => 1000; sub dbh_new { my ($self) = @_; my $ro = ref($self) eq 'PublicInbox::Over'; my $f = $self->{filename}; if (!$ro && !-f $f) { # SQLite defaults mode to 0644, we want 0666 open my $fh, '+>>', $f or die "failed to open $f: $!"; } my $dbh = DBI->connect("dbi:SQLite:dbname=$f",'','', { AutoCommit => 1, RaiseError => 1, PrintError => 0, ReadOnly => $ro, sqlite_use_immediate_transaction => 1, }); $dbh->{sqlite_unicode} = 1; $dbh; } sub new { my ($class, $f) = @_; bless { filename => $f }, $class; } sub disconnect { $_[0]->{dbh} = undef } sub connect { $_[0]->{dbh} ||= $_[0]->dbh_new } sub load_from_row ($;$) { my ($smsg, $cull) = @_; bless $smsg, 'PublicInbox::SearchMsg'; if (defined(my $data = delete $smsg->{ddd})) { $data = uncompress($data); utf8::decode($data); PublicInbox::SearchMsg::load_from_data($smsg, $data); # saves over 600K for 1000+ message threads PublicInbox::SearchMsg::psgi_cull($smsg) if $cull; } $smsg } sub do_get { my ($self, $sql, $opts, @args) = @_; my $dbh = $self->connect; my $lim = (($opts->{limit} || 0) + 0) || DEFAULT_LIMIT; $sql .= "LIMIT $lim"; my $msgs = $dbh->selectall_arrayref($sql, { Slice => {} }, @args); my $cull = $opts->{cull}; load_from_row($_, $cull) for @$msgs; $msgs } sub query_xover { my ($self, $beg, $end) = @_; do_get($self, <<'', {}, $beg, $end); SELECT num,ts,ds,ddd FROM over WHERE num >= ? AND num <= ? ORDER BY num ASC } sub query_ts { my ($self, $ts, $prev) = @_; do_get($self, <<'', {}, $ts, $prev); SELECT num,ddd FROM over WHERE ts >= ? AND num > ? ORDER BY num ASC } sub nothing () { wantarray ? (0, []) : [] }; sub get_thread { my ($self, $mid, $prev) = @_; my $dbh = $self->connect; my $opts = { cull => 1 }; my $id = $dbh->selectrow_array(<<'', undef, $mid); SELECT id FROM msgid WHERE mid = ? LIMIT 1 defined $id or return nothing; my $num = $dbh->selectrow_array(<<'', undef, $id); SELECT num FROM id2num WHERE id = ? AND num > 0 ORDER BY num ASC LIMIT 1 defined $num or return nothing; my ($tid, $sid) = $dbh->selectrow_array(<<'', undef, $num); SELECT tid,sid FROM over WHERE num = ? LIMIT 1 defined $tid or return nothing; # $sid may be undef my $cond_all = '(tid = ? OR sid = ?) AND num > ?'; my $sort_col = 'ds'; $num = 0; if ($prev) { # mboxrd stream, only $num = $prev->{num} || 0; $sort_col = 'num'; } my $cols = 'num,ts,ds,ddd'; unless (wantarray) { return do_get($self, <<"", $opts, $tid, $sid, $num); SELECT $cols FROM over WHERE $cond_all ORDER BY $sort_col ASC } # HTML view always wants an array and never uses $prev, # but the mbox stream never wants an array and always has $prev die '$prev not supported with wantarray' if $prev; my $nr = $dbh->selectrow_array(<<"", undef, $tid, $sid, $num); SELECT COUNT(num) FROM over WHERE $cond_all # giant thread, prioritize strict (tid) matches and throw # in the loose (sid) matches at the end my $msgs = do_get($self, <<"", $opts, $tid, $num); SELECT $cols FROM over WHERE tid = ? AND num > ? ORDER BY $sort_col ASC # do we have room for loose matches? get the most recent ones, first: my $lim = DEFAULT_LIMIT - scalar(@$msgs); if ($lim > 0) { $opts->{limit} = $lim; my $loose = do_get($self, <<"", $opts, $tid, $sid, $num); SELECT $cols FROM over WHERE tid != ? AND sid = ? AND num > ? ORDER BY $sort_col DESC # TODO separate strict and loose matches here once --reindex # is fixed to preserve `tid' properly push @$msgs, @$loose; } ($nr, $msgs); } sub recent { my ($self, $opts, $after, $before) = @_; my ($s, @v); if (defined($before)) { if (defined($after)) { $s = '+num > 0 AND ts >= ? AND ts <= ? ORDER BY ts DESC'; @v = ($after, $before); } else { $s = '+num > 0 AND ts <= ? ORDER BY ts DESC'; @v = ($before); } } else { if (defined($after)) { $s = '+num > 0 AND ts >= ? ORDER BY ts ASC'; @v = ($after); } else { $s = '+num > 0 ORDER BY ts DESC'; } } my $msgs = do_get($self, <<"", $opts, @v); SELECT ts,ds,ddd FROM over WHERE $s return $msgs unless wantarray; my $nr = $self->{dbh}->selectrow_array(<<''); SELECT COUNT(num) FROM over WHERE num > 0 ($nr, $msgs); } sub get_art { my ($self, $num) = @_; my $dbh = $self->connect; my $smsg = $dbh->selectrow_hashref(<<'', undef, $num); SELECT num,ds,ts,ddd FROM over WHERE num = ? LIMIT 1 return load_from_row($smsg) if $smsg; undef; } sub next_by_mid { my ($self, $mid, $id, $prev) = @_; my $dbh = $self->connect; unless (defined $$id) { my $sth = $dbh->prepare_cached(<<'', undef, 1); SELECT id FROM msgid WHERE mid = ? LIMIT 1 $sth->execute($mid); $$id = $sth->fetchrow_array; defined $$id or return; } my $sth = $dbh->prepare_cached(<<"", undef, 1); SELECT num FROM id2num WHERE id = ? AND num > ? ORDER BY num ASC LIMIT 1 $$prev ||= 0; $sth->execute($$id, $$prev); my $num = $sth->fetchrow_array or return; $$prev = $num; $sth = $dbh->prepare_cached(<<"", undef, 1); SELECT num,ts,ds,ddd FROM over WHERE num = ? LIMIT 1 $sth->execute($num); my $smsg = $sth->fetchrow_hashref or return; load_from_row($smsg); } 1;