diff options
Diffstat (limited to 'lib/PublicInbox/Over.pm')
| -rw-r--r-- | lib/PublicInbox/Over.pm | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm new file mode 100644 index 00000000..07e54b64 --- /dev/null +++ b/lib/PublicInbox/Over.pm @@ -0,0 +1,183 @@ +# Copyright (C) 2018 all contributors <meta@public-inbox.org> +# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt> + +# 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); + +sub dbh_new { + my ($self) = @_; + my $ro = ref($self) eq 'PublicInbox::Over'; + my $dbh = DBI->connect("dbi:SQLite:dbname=$self->{filename}",'','', { + 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) = @_; + bless $smsg, 'PublicInbox::SearchMsg'; + if (defined(my $data = delete $smsg->{ddd})) { + $data = uncompress($data); + utf8::decode($data); + $smsg->load_from_data($data); + } + $smsg +} + +sub do_get { + my ($self, $sql, $opts, @args) = @_; + my $dbh = $self->connect; + my $lim = (($opts->{limit} || 0) + 0) || 1000; + $sql .= "LIMIT $lim"; + my $msgs = $dbh->selectall_arrayref($sql, { Slice => {} }, @args); + load_from_row($_) for @$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 $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 $sort_col = 'ds'; + $num = 0; + if ($prev) { + $num = $prev->{num} || 0; + $sort_col = 'num'; + } + my $cond = '(tid = ? OR sid = ?) AND num > ?'; + my $msgs = do_get($self, <<"", {}, $tid, $sid, $num); +SELECT num,ts,ds,ddd FROM over WHERE $cond ORDER BY $sort_col ASC + + return $msgs unless wantarray; + + my $nr = $dbh->selectrow_array(<<"", undef, $tid, $sid, $num); +SELECT COUNT(num) FROM over WHERE $cond + + ($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; |