rewrite Linux nodatacow use in pure Perl w/o system

[public-inbox.git] / lib / PublicInbox / Over.pm

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index 49ba180b94478fa4dd92831f709715ffa0796849..786f9d922282ea3358c7664462ceb8b591d05e4d 100644 (file)
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2018-2020 all contributors <meta@public-inbox.org>
+# Copyright (C) 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
@@ -7,7 +7,7 @@
 package PublicInbox::Over;
 use strict;
 use v5.10.1;
-use DBI;
+use DBI qw(:sql_types); # SQL_BLOB
 use DBD::SQLite;
 use PublicInbox::Smsg;
 use Compress::Zlib qw(uncompress);
@@ -16,11 +16,12 @@ 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 (!-s $f) { # SQLite defaults mode to 0644, we want 0666
                if ($rw) {
-                       require PublicInbox::Spawn;
+                       require PublicInbox::Syscall;
+                       my ($dir) = ($f =~ m!(.+)/[^/]+\z!);
+                       PublicInbox::Syscall::nodatacow_dir($dir);
                        open my $fh, '+>>', $f or die "failed to open $f: $!";
-                       PublicInbox::Spawn::nodatacow_fd(fileno($fh));
                } else {
                        $self->{filename} = $f; # die on stat() below:
                }
@@ -106,8 +107,8 @@ sub do_get {
 }
 
 sub query_xover {
-       my ($self, $beg, $end) = @_;
-       do_get($self, <<'', {}, $beg, $end);
+       my ($self, $beg, $end, $opt) = @_;
+       do_get($self, <<'', $opt, $beg, $end);
 SELECT num,ts,ds,ddd FROM over WHERE num >= ? AND num <= ?
 ORDER BY num ASC
 
@@ -349,4 +350,37 @@ sub check_inodes {
        }
 }
 
+sub oidbin_exists {
+       my ($self, $oidbin) = @_;
+       if (wantarray) {
+               my $sth = $self->dbh->prepare_cached(<<'', undef, 1);
+SELECT docid FROM xref3 WHERE oidbin = ? ORDER BY docid ASC
+
+               $sth->bind_param(1, $oidbin, SQL_BLOB);
+               $sth->execute;
+               my $tmp = $sth->fetchall_arrayref;
+               map { $_->[0] } @$tmp;
+       } else {
+               my $sth = $self->dbh->prepare_cached(<<'', undef, 1);
+SELECT COUNT(*) FROM xref3 WHERE oidbin = ?
+
+               $sth->bind_param(1, $oidbin, SQL_BLOB);
+               $sth->execute;
+               $sth->fetchrow_array;
+       }
+}
+
+sub blob_exists { oidbin_exists($_[0], pack('H*', $_[1])) }
+
+# used by NNTP.pm
+sub ids_after {
+       my ($self, $num) = @_;
+       my $ids = dbh($self)->selectcol_arrayref(<<'', undef, $$num);
+SELECT num FROM over WHERE num > ?
+ORDER BY num ASC LIMIT 1000
+
+       $$num = $ids->[-1] if @$ids;
+       $ids;
+}
+
 1;