qspawn: implement psgi_return and use it for githttpbackend

Was: ("repobrowse: port patch generation over to qspawn")

We'll be using it for githttpbackend and maybe other things.

1 files changed, 5 insertions, 59 deletions

diff --git a/lib/PublicInbox/GitHTTPBackend.pm b/lib/PublicInbox/GitHTTPBackend.pm
index 54ccfa05..ab43a009 100644
--- a/lib/PublicInbox/GitHTTPBackend.pm
+++ b/lib/PublicInbox/GitHTTPBackend.pm
@@ -200,69 +200,15 @@ sub serve_smart {
                 $env{$name} = $val if defined $val;
         }
         my $limiter = $git->{-httpbackend_limiter} || $default_limiter;
-        my $git_dir = $git->{git_dir};
         $env{GIT_HTTP_EXPORT_ALL} = '1';
-        $env{PATH_TRANSLATED} = "$git_dir/$path";
+        $env{PATH_TRANSLATED} = "$git->{git_dir}/$path";
         my $rdr = { 0 => fileno($in) };
         my $qsp = PublicInbox::Qspawn->new([qw(git http-backend)], \%env, $rdr);
-        my ($fh, $rpipe);
-        my $end = sub {
-                if (my $err = $qsp->finish) {
-                        err($env, "git http-backend ($git_dir): $err");
-                }
-                $fh->close if $fh; # async-only
-        };
-
-        # Danga::Socket users, we queue up the read_enable callback to
-        # fire after pending writes are complete:
-        my $buf = '';
-        my $rd_hdr = sub {
-                my $r = sysread($rpipe, $buf, 1024, length($buf));
-                return if !defined($r) && ($!{EINTR} || $!{EAGAIN});
-                return r(500, 'http-backend error') unless $r;
-                $r = parse_cgi_headers(\$buf) or return; # incomplete headers
+        $qsp->psgi_return($env, $limiter, sub {
+                my ($r, $bref) = @_;
+                $r = parse_cgi_headers($bref) or return; # incomplete headers
                 $r->[0] == 403 ? serve_dumb($env, $git, $path) : $r;
-        };
-        my $res;
-        my $async = $env->{'pi-httpd.async'}; # XXX unstable API
-        my $cb = sub {
-                my $r = $rd_hdr->() or return;
-                $rd_hdr = undef;
-                if (scalar(@$r) == 3) { # error:
-                        if ($async) {
-                                $async->close; # calls rpipe->close
-                        } else {
-                                $rpipe->close;
-                                $end->();
-                        }
-                        $res->($r);
-                } elsif ($async) {
-                        $fh = $res->($r);
-                        $async->async_pass($env->{'psgix.io'}, $fh, \$buf);
-                } else { # for synchronous PSGI servers
-                        require PublicInbox::GetlineBody;
-                        $r->[2] = PublicInbox::GetlineBody->new($rpipe, $end,
-                                                                $buf);
-                        $res->($r);
-                }
-        };
-        sub {
-                ($res) = @_;
-
-                # hopefully this doesn't break any middlewares,
-                # holding the input here is a waste of FDs and memory
-                $env->{'psgi.input'} = undef;
-
-                $qsp->start($limiter, sub { # may run later, much later...
-                        ($rpipe) = @_;
-                        $in = undef;
-                        if ($async) {
-                                $async = $async->($rpipe, $cb, $end);
-                        } else { # generic PSGI
-                                $cb->() while $rd_hdr;
-                        }
-                });
-        };
+        });
 }
 
 sub input_to_file {