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| | # Copyright (C) 2016 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
#
# internal class used by PublicInbox::Git + Danga::Socket
# This parses the output pipe of "git cat-file --batch/--batch-check"
package PublicInbox::GitAsync;
use strict;
use warnings;
use base qw(Danga::Socket);
use fields qw(jobq rbuf wr check);
use PublicInbox::GitAsyncWr;
our $MAX = 65536; # Import may bump this in the future
sub new {
my ($class, $rd, $wr, $check) = @_;
my $self = fields::new($class);
IO::Handle::blocking($rd, 0);
$self->SUPER::new($rd);
$self->{jobq} = []; # [ [ $obj, $cb, $state ], ... ]
my $buf = '';
$self->{rbuf} = \$buf;
$self->{wr} = PublicInbox::GitAsyncWr->new($wr);
$self->{check} = $check;
$self->watch_read(1);
$self;
}
sub cat_file_async {
my ($self, $obj, $cb) = @_;
# order matters
push @{$self->{jobq}}, [ $obj, $cb ];
$self->{wr}->write(\"$obj\n");
}
# Returns: an array ref of the info line for --batch-check and --batch,
# which may be: [ $obj, 'missing']
# Returns undef on error
sub read_info ($) {
my ($self) = @_;
my $rbuf = $self->{rbuf};
my $rd = $self->{sock};
while (1) {
$$rbuf =~ s/\A([^\n]+)\n//s and return [ split(/ /, $1) ];
my $r = sysread($rd, $$rbuf, 110, length($$rbuf));
next if $r;
return $r;
}
}
sub event_read {
my ($self) = @_;
my $jobq = $self->{jobq};
my ($cur, $obj, $cb, $info, $left);
my $check = $self->{check};
my ($rbuf, $rlen, $need, $buf);
take_job:
$cur = shift @$jobq or die 'BUG: empty job queue in '.__PACKAGE__;
($obj, $cb, $info, $left) = @$cur;
if (!$info) {
$info = read_info($self);
if (!defined $info && ($!{EAGAIN} || $!{EINTR})) {
return unshift(@$jobq, $cur)
}
$cb->($info); # $info may 0 (EOF, or undef, $cb will see $!)
return $self->close unless $info;
if ($check || $info->[1] eq 'missing') {
# do not monopolize the event loop if we're drained:
return if ${$self->{rbuf}} eq '';
goto take_job;
}
$cur->[2] = $info;
my $len = $info->[2];
$left = \$len;
$cur->[3] = $left; # onto reading body...
}
ref($left) or die 'BUG: $left not ref in '.__PACKAGE__;
$rbuf = $self->{rbuf};
$rlen = length($$rbuf);
$need = $$left + 1; # +1 for trailing LF
$buf = '';
if ($rlen == $need) {
final_hunk:
$self->{rbuf} = \$buf;
$$left = undef;
my $lf = chop $$rbuf;
$lf eq "\n" or die "BUG: missing LF (got $lf)";
$cb->($rbuf);
$cb->(0);
return if $buf eq '';
goto take_job;
} elsif ($rlen < $need) {
my $all = $need - $rlen;
my $n = $all > $MAX ? $MAX : $all;
my $r = sysread($self->{sock}, $$rbuf, $n, $rlen);
if ($r) {
goto final_hunk if $r == $all;
# more to read later...
$$left -= $r;
$self->{rbuf} = \$buf;
$cb->($rbuf);
# don't monopolize the event loop
return unshift(@$jobq, $cur);
} elsif (!defined $r) {
return unshift(@$jobq, $cur) if $!{EAGAIN} || $!{EINTR};
}
$cb->($r); # $cb should handle 0 and undef (and see $!)
$self->close; # FAIL...
} else { # too much data in rbuf
$buf = substr($$rbuf, $need, $rlen - $need);
$$rbuf = substr($$rbuf, 0, $need);
goto final_hunk;
}
}
sub close {
my $self = shift;
my $jobq = $self->{jobq};
$self->{jobq} = [];
$_->[1]->(0) for @$jobq;
$self->{wr}->close;
$self->SUPER::close(@_);
}
sub event_hup { $_[0]->close }
sub event_err { $_[0]->close }
1;
|