# Copyright (C) 2018 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);
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) = @_;
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;