# Copyright (C) 2018-2020 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::Smsg; use Compress::Zlib qw(uncompress); use constant DEFAULT_LIMIT => 1000; sub dbh_new { my ($self, $rw) = @_; my $f = delete $self->{filename}; if (!-f $f) { # SQLite defaults mode to 0644, we want 0666 if ($rw) { require PublicInbox::Spawn; open my $fh, '+>>', $f or die "failed to open $f: $!"; PublicInbox::Spawn::nodatacow_fd(fileno($fh)); } else { $self->{filename} = $f; # die on stat() below: } } my (@st, $st, $dbh); my $tries = 0; do { @st = stat($f) or die "failed to stat $f: $!"; $st = pack('dd', $st[0], $st[1]); # 0: dev, 1: inode $dbh = DBI->connect("dbi:SQLite:dbname=$f",'','', { AutoCommit => 1, RaiseError => 1, PrintError => 0, ReadOnly => !$rw, sqlite_use_immediate_transaction => 1, }); $self->{st} = $st; @st = stat($f) or die "failed to stat $f: $!"; $st = pack('dd', $st[0], $st[1]); } while ($st ne $self->{st} && $tries++ < 3); warn "W: $f: .st_dev, .st_ino unstable\n" if $st ne $self->{st}; if ($rw) { # TRUNCATE reduces I/O compared to the default (DELETE). # # Do not use WAL by default since we expect the case # where any users may read via read-only daemons # (-httpd/-imapd/-nntpd); but only a single user has # write permissions for -watch/-mda. # # Read-only WAL support in SQLite 3.22.0 (2018-01-22) # doesn't do what we need: it is only intended for # immutable read-only media (e.g. CD-ROM) and not # usable for our use case described above. # # If an admin is willing to give read-only daemons R/W # permissions; they can enable WAL manually and we will # respect that by not clobbering it. my $jm = $dbh->selectrow_array('PRAGMA journal_mode'); $dbh->do('PRAGMA journal_mode = TRUNCATE') if $jm ne 'wal'; $dbh->do('PRAGMA synchronous = OFF') if $rw > 1; } $dbh; } sub new { my ($class, $f) = @_; bless { filename => $f }, $class; } sub disconnect { my ($self) = @_; if (my $dbh = delete $self->{dbh}) { delete $self->{-get_art}; $self->{filename} = $dbh->sqlite_db_filename; } } sub connect { $_[0]->{dbh} //= $_[0]->dbh_new } sub load_from_row ($;$) { my ($smsg, $cull) = @_; bless $smsg, 'PublicInbox::Smsg'; if (defined(my $data = delete $smsg->{ddd})) { $data = uncompress($data); PublicInbox::Smsg::load_from_data($smsg, $data); # saves over 600K for 1000+ message threads PublicInbox::Smsg::psgi_cull($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 get_all { my $self = shift; my $nr = scalar(@_) or return []; my $in = '?' . (',?' x ($nr - 1)); do_get($self, <<"", { cull => 1, limit => $nr }, @_); SELECT num,ds,ddd FROM over WHERE num IN ($in) } 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, $msgs); } # strict `tid' matches, only, for thread-expanded mbox.gz search results # and future CLI interface # returns true if we have IDs, undef if not sub expand_thread { my ($self, $ctx) = @_; my $dbh = $self->connect; do { defined(my $num = $ctx->{ids}->[0]) or return; my ($tid) = $dbh->selectrow_array(<<'', undef, $num); SELECT tid FROM over WHERE num = ? if (defined($tid)) { my $sql = <<''; SELECT num FROM over WHERE tid = ? AND num > ? ORDER BY num ASC LIMIT 1000 my $xids = $dbh->selectcol_arrayref($sql, undef, $tid, $ctx->{prev} // 0); if (scalar(@$xids)) { $ctx->{prev} = $xids->[-1]; $ctx->{xids} = $xids; return 1; # success } } $ctx->{prev} = 0; shift @{$ctx->{ids}}; } while (1); } 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) = @_; # caching $sth ourselves is faster than prepare_cached my $sth = $self->{-get_art} //= $self->connect->prepare(<<''); SELECT num,tid,ds,ts,ddd FROM over WHERE num = ? LIMIT 1 $sth->execute($num); my $smsg = $sth->fetchrow_hashref; $smsg ? load_from_row($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; $$prev = $num; get_art($self, $num); } # IMAP search, this is limited by callers to UID_SLICE size (50K) sub uid_range { my ($self, $beg, $end, $sql) = @_; my $dbh = $self->connect; my $q = 'SELECT num FROM over WHERE num >= ? AND num <= ?'; # This is read-only, anyways; but caller should verify it's # only sending \A[0-9]+\z for ds and ts column ranges $q .= $$sql if $sql; $q .= ' ORDER BY num ASC'; $dbh->selectcol_arrayref($q, undef, $beg, $end); } sub max { my ($self) = @_; my $sth = $self->connect->prepare_cached(<<'', undef, 1); SELECT MAX(num) FROM over WHERE num > 0 $sth->execute; $sth->fetchrow_array // 0; } sub imap_exists { my ($self, $uid_base, $uid_end) = @_; my $sth = $self->connect->prepare_cached(<<'', undef, 1); SELECT COUNT(num) FROM over WHERE num > ? AND num <= ? $sth->execute($uid_base, $uid_end); $sth->fetchrow_array; } sub check_inodes { my ($self) = @_; my $dbh = $self->{dbh} or return; my $f = $dbh->sqlite_db_filename; if (my @st = stat($f)) { # did st_dev, st_ino change? my $st = pack('dd', $st[0], $st[1]); # don't actually reopen, just let {dbh} be recreated later disconnect($self) if $st ne ($self->{st} // $st); } else { warn "W: stat $f: $!\n"; } } 1;