use strict;
use warnings;
use base qw(Danga::Socket);
-use fields qw(nntpd article ng);
+use fields qw(nntpd article ng long_res);
use PublicInbox::Msgmap;
use PublicInbox::GitCatFile;
use PublicInbox::MID qw(mid2path);
use Email::Simple;
use Data::Dumper qw(Dumper);
use POSIX qw(strftime);
+use Time::HiRes qw(gettimeofday tv_interval ualarm);
use constant {
r501 => '501 command syntax error',
+ long_response_limit => 0xffffffff,
};
my @OVERVIEW = qw(Subject From Date Message-ID References Bytes Lines);
# LISTGROUP could get pretty bad, too...
my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
-sub new {
+sub new ($$$) {
my ($class, $sock, $nntpd) = @_;
my $self = fields::new($class);
$self->SUPER::new($sock);
$self;
}
+sub args_ok ($$) {
+ my ($cb, $argc) = @_;
+ my $tot = prototype $cb;
+ my ($nreq, undef) = split(';', $tot);
+ $nreq = ($nreq =~ tr/$//) - 1;
+ $tot = ($tot =~ tr/$//) - 1;
+ ($argc <= $tot && $argc >= $nreq);
+}
+
# returns 1 if we can continue, 0 if not due to buffered writes or disconnect
-sub process_line {
+sub process_line ($$) {
my ($self, $l) = @_;
my ($req, @args) = split(/\s+/, $l);
$req = lc($req);
$req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
};
return res($self, '500 command not recognized') unless $req;
+ return res($self, r501) unless args_ok($req, scalar @args);
my $res = eval { $req->($self, @args) };
my $err = $@;
res($self, $res);
}
-sub cmd_mode {
+sub cmd_mode ($$) {
my ($self, $arg) = @_;
- return r501 unless defined $arg;
$arg = uc $arg;
return r501 unless $arg eq 'READER';
'200 reader status acknowledged';
}
-sub cmd_slave {
- my ($self, @x) = @_;
- return r501 if @x;
- '202 slave status noted';
-}
+sub cmd_slave ($) { '202 slave status noted' }
-sub cmd_xgtitle {
+sub cmd_xgtitle ($;$) {
my ($self, $wildmat) = @_;
more($self, '282 list of groups and descriptions follows');
list_newsgroups($self, $wildmat);
'.'
}
-sub list_overview_fmt {
+sub list_overview_fmt ($$) {
my ($self) = @_;
more($self, $_ . ':') foreach @OVERVIEW;
}
-sub list_active {
+sub list_active ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
}
}
-sub list_active_times {
+sub list_active_times ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
}
}
-sub list_newsgroups {
+sub list_newsgroups ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
}
# LIST SUBSCRIPTIONS not supported
-sub cmd_list {
- my ($self, $arg, $wildmat, @x) = @_;
- if (defined $arg) {
- $arg = lc $arg;
- $arg =~ tr/./_/;
+sub cmd_list ($;$$) {
+ my ($self, @args) = @_;
+ if (scalar @args) {
+ my $arg = shift @args;
+ $arg =~ tr/A-Z./a-z_/;
$arg = "list_$arg";
return '503 function not performed' if $DISABLED{$arg};
+
$arg = eval {
no strict 'refs';
*{$arg}{CODE};
};
- return r501 unless $arg;
+ return r501 unless $arg && args_ok($arg, scalar @args);
more($self, '215 information follows');
- $arg->($self, $wildmat, @x);
+ $arg->($self, @args);
} else {
more($self, '215 list of newsgroups follows');
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
'.'
}
-sub cmd_listgroup {
+sub cmd_listgroup ($;$) {
my ($self, $group) = @_;
if (defined $group) {
my $res = cmd_group($self, $group);
more($self, $res);
}
- my $ng = $self->{ng} or return '412 no newsgroup selected';
- # Ugh this can be silly expensive for big groups
- $ng->mm->each_id_batch(sub {
- my ($ary) = @_;
- more($self, join("\r\n", @$ary));
+ $self->{ng} or return '412 no newsgroup selected';
+ $self->long_response(0, long_response_limit, sub {
+ my ($i) = @_;
+ my $nr = $self->{ng}->mm->id_batch($$i, sub {
+ my ($ary) = @_;
+ more($self, join("\r\n", @$ary));
+ });
+
+ # -1 to adjust for implicit increment in long_response
+ $$i = $nr ? $$i + $nr - 1 : long_response_limit;
});
- '.'
}
-sub parse_time {
+sub parse_time ($$;$) {
my ($date, $time, $gmt) = @_;
use Time::Local qw();
my ($YY, $MM, $DD) = unpack('A2A2A2', $date);
}
}
-sub group_line {
+sub group_line ($$) {
my ($self, $ng) = @_;
my ($min, $max) = $ng->mm->minmax;
more($self, "$ng->{name} $max $min n") if defined $min && defined $max;
}
-sub cmd_newgroups {
+sub cmd_newgroups ($$$;$$) {
my ($self, $date, $time, $gmt, $dists) = @_;
my $ts = eval { parse_time($date, $time, $gmt) };
return r501 if $@;
'.'
}
-sub wildmat2re {
+sub wildmat2re (;$) {
return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
my %keep;
my $salt = rand;
$_[0] = qr/\A$tmp\z/;
}
-sub ngpat2re {
+sub ngpat2re (;$) {
return $_[0] = qr/\A\z/ unless defined $_[0];
my %map = ('*' => '.*', ',' => '|');
$_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
$_[0] = qr/\A(?:$_[0])\z/;
}
-sub cmd_newnews {
+sub cmd_newnews ($$$$;$$) {
my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
my $ts = eval { parse_time($date, $time, $gmt) };
return r501 if $@;
my ($keep, $skip) = split('!', $newsgroups, 2);
ngpat2re($keep);
ngpat2re($skip);
- $ts .= '..';
-
- my $opts = { asc => 1, limit => 1000 };
+ my @srch;
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
$ng->{name} =~ $keep or next;
$ng->{name} =~ $skip and next;
my $srch = $ng->search or next;
- $opts->{offset} = 0;
+ push @srch, $srch;
+ };
+ return '.' unless @srch;
- while (1) {
- my $res = $srch->query($ts, $opts);
- my $msgs = $res->{msgs};
- my $nr = scalar @$msgs or last;
+ $ts .= '..';
+ my $opts = { asc => 1, limit => 1000, offset => 0 };
+ $self->long_response(0, long_response_limit, sub {
+ my ($i) = @_;
+ my $srch = $srch[0];
+ my $res = $srch->query($ts, $opts);
+ my $msgs = $res->{msgs};
+ if (my $nr = scalar @$msgs) {
more($self, '<' .
join(">\r\n<", map { $_->mid } @$msgs ).
'>');
$opts->{offset} += $nr;
+ } else {
+ shift @srch;
+ if (@srch) { # continue onto next newsgroup
+ $opts->{offset} = 0;
+ } else { # break out of the long response.
+ $$i = long_response_limit;
+ }
}
- }
- '.';
+ });
}
-sub cmd_group {
+sub cmd_group ($$) {
my ($self, $group) = @_;
my $no_such = '411 no such news group';
my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
"211 $est_size $min $max $group";
}
-sub article_adj {
+sub article_adj ($$) {
my ($self, $off) = @_;
my $ng = $self->{ng} or return '412 no newsgroup selected';
"223 $n <$mid> article retrieved - request text separately";
}
-sub cmd_next { article_adj($_[0], 1) }
-sub cmd_last { article_adj($_[0], -1) }
+sub cmd_next ($) { article_adj($_[0], 1) }
+sub cmd_last ($) { article_adj($_[0], -1) }
# We want to encourage using email and CC-ing everybody involved to avoid
# the single-point-of-failure a single server provides.
-sub cmd_post {
+sub cmd_post ($) {
my ($self) = @_;
my $ng = $self->{ng};
$ng ? "440 mailto:$ng->{address} to post" : '440 posting not allowed'
}
-sub cmd_quit {
+sub cmd_quit ($) {
my ($self) = @_;
res($self, '205 closing connection - goodbye!');
$self->close;
undef;
}
-sub art_lookup {
+sub art_lookup ($$$) {
my ($self, $art, $set_headers) = @_;
my $ng = $self->{ng} or return '412 no newsgroup has been selected';
my ($n, $mid);
[ $n, $mid, $s ];
}
-sub simple_body_write {
+sub simple_body_write ($$) {
my ($self, $s) = @_;
my $body = $s->body;
$s->body_set('');
'.'
}
-sub header_str {
+sub header_str ($) {
my ($s) = @_;
my $h = $s->header_obj;
$h->header_set('Bytes');
$h->as_string
}
-sub cmd_article {
+sub cmd_article ($$) {
my ($self, $art) = @_;
my $r = $self->art_lookup($art, 1);
return $r unless ref $r;
simple_body_write($self, $s);
}
-sub cmd_head {
+sub cmd_head ($$) {
my ($self, $art) = @_;
my $r = $self->art_lookup($art, 2);
return $r unless ref $r;
'.'
}
-sub cmd_body {
+sub cmd_body ($$) {
my ($self, $art) = @_;
my $r = $self->art_lookup($art, 0);
return $r unless ref $r;
simple_body_write($self, $s);
}
-sub cmd_stat {
+sub cmd_stat ($$) {
my ($self, $art) = @_;
my $r = $self->art_lookup($art, 0);
return $r unless ref $r;
"223 $n <$mid> article retrieved - request text separately";
}
-sub cmd_ihave { '435 article not wanted - do not send it' }
+sub cmd_ihave ($) { '435 article not wanted - do not send it' }
-sub cmd_date { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
+sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
-sub cmd_help {
+sub cmd_help ($) {
my ($self) = @_;
more($self, '100 help text follows');
'.'
}
-sub get_range {
+sub get_range ($$) {
my ($self, $range) = @_;
my $ng = $self->{ng} or return '412 no news group has been selected';
defined $range or return '420 No article(s) selected';
[ $beg, $end ];
}
-sub xhdr {
+sub xhdr ($$) {
my ($r, $header) = @_;
$r = $r->[2]->header_obj->header($header);
defined $r or return;
$r;
}
-sub cmd_xhdr {
+sub long_response ($$$$) {
+ my ($self, $beg, $end, $cb) = @_;
+ die "BUG: nested long response" if $self->{long_res};
+
+ # make sure we disable reading during a long response,
+ # clients should not be sending us stuff and making us do more
+ # work while we are stream a response to them
+ $self->watch_read(0);
+ $self->{long_res} = sub {
+ # limit our own running time for fairness with other
+ # clients and to avoid buffering too much:
+ my $yield;
+ local $SIG{ALRM} = sub { $yield = 1 };
+ ualarm(100000);
+
+ my $err;
+ do {
+ eval { $cb->(\$beg) };
+ } until (($err = $@) || $self->{closed} || $yield ||
+ $self->{write_buf_size} || ++$beg > $end);
+ ualarm(0);
+
+ if ($err || $self->{closed}) {
+ $self->{long_res} = undef;
+ warning("$err during long response") if $err;
+ $self->watch_read(1) unless $self->{closed};
+ } elsif ($yield || $self->{write_buf_size}) {
+ # no recursion, schedule another call ASAP
+ # but only after all pending writes are done
+ Danga::Socket->AddTimer(0, sub {
+ $self->write($self->{long_res});
+ });
+ } else { # all done!
+ $self->{long_res} = undef;
+ $self->watch_read(1);
+ res($self, '.');
+ }
+ };
+ $self->{long_res}->(); # kick off!
+ undef;
+}
+
+sub xhdr_message_id ($$) { # optimize XHDR Message-ID [range] for slrnpull.
+ my ($self, $range) = @_;
+
+ my $mm = $self->{ng}->mm;
+ if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
+ my $n = $mm->num_for($range);
+ more($self, '221 Header follows');
+ more($self, "<$range> <$range>") if defined $n;
+ '.';
+ } else { # numeric range
+ $range = $self->{article} unless defined $range;
+ my $r = get_range($self, $range);
+ return $r unless ref $r;
+ my ($beg, $end) = @$r;
+ more($self, '221 Header follows');
+ $self->long_response($beg, $end, sub {
+ my ($i) = @_;
+ my $mid = $mm->mid_for($$i);
+ more($self, "$$i <$mid>") if defined $mid;
+ });
+ }
+}
+
+sub cmd_xhdr ($$;$) {
my ($self, $header, $range) = @_;
defined $self->{ng} or return '412 no news group currently selected';
- unless (defined $range) {
- defined($range = $self->{article}) or
- return '420 no current article has been selected';
- }
- if ($range =~ /\A<(.+)>\z/) { # Message-ID
+ my $sub = $header;
+ $sub =~ tr/A-Z-/a-z_/;
+ $sub = eval {
+ no strict 'refs';
+ $sub = *{'xhdr_'.$sub}{CODE};
+ };
+ return xhdr_slow($self, $header, $range) unless defined $sub;
+ $sub->($self, $range);
+}
+
+sub xhdr_slow ($$$) {
+ my ($self, $header, $range) = @_;
+
+ if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
my $r = $self->art_lookup($range, 2);
return $r unless ref $r;
more($self, '221 Header follows');
if (defined($r = xhdr($r, $header))) {
more($self, "<$range> $r");
}
+ '.';
} else { # numeric range
+ $range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
more($self, '221 Header follows');
- foreach my $i ($beg..$end) {
- $r = $self->art_lookup($i, 2);
- next unless ref $r;
- defined($r = xhdr($r, $header)) or next;
- more($self, "$i $r");
- }
+ $self->long_response($beg, $end, sub {
+ my ($i) = @_;
+ $r = $self->art_lookup($$i, 2);
+ return unless ref $r;
+ defined($r = xhdr($r, $header)) or return;
+ more($self, "$$i $r");
+ });
}
- '.';
}
-sub cmd_xover {
+sub cmd_xover ($;$) {
my ($self, $range) = @_;
+ $range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
more($self, "224 Overview information follows for $beg to $end");
- foreach my $i ($beg..$end) {
- my $r = $self->art_lookup($i, 2);
- next unless ref $r;
+ $self->long_response($beg, $end, sub {
+ my ($i) = @_;
+ my $r = $self->art_lookup($$i, 2);
+ return unless ref $r;
more($self, join("\t", $r->[0],
map {
my $h = xhdr($r, $_);
defined $h ? $h : '';
} @OVERVIEW ));
- }
- '.';
+ });
}
-sub res {
+sub res ($$) {
my ($self, $line) = @_;
do_write($self, $line . "\r\n");
}
-sub more {
+sub more ($$) {
my ($self, $line) = @_;
do_more($self, $line . "\r\n");
}
-sub do_write {
+sub do_write ($$) {
my ($self, $data) = @_;
my $done = $self->write($data);
die if $self->{closed};
# Do not watch for readability if we have data in the queue,
# instead re-enable watching for readability when we can
- $self->watch_read(0) unless $done;
+ $self->watch_read(0) if (!$done || $self->{long_res});
$done;
}
use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
-sub do_more {
+sub do_more ($$) {
my ($self, $data) = @_;
if (MSG_MORE && !$self->{write_buf_size}) {
my $n = send($self->{sock}, $data, MSG_MORE);
sub event_read {
my ($self) = @_;
use constant LINE_MAX => 512; # RFC 977 section 2.3
- use Time::HiRes qw(gettimeofday tv_interval);
my $r = 1;
my $buf = $self->read(LINE_MAX) or return $self->close;
while ($r > 0 && $$buf =~ s/\A([^\r\n]+)\r?\n//) {