use strict;
use warnings;
use Fcntl qw(:seek);
-use POSIX qw(dup2);
+use PublicInbox::Spawn qw(spawn);
# n.b. serving "description" and "cloneurl" should be innocuous enough to
# not cause problems. serving "config" might...
my $buf;
my $in;
my $err = $env->{'psgi.errors'};
- if (fileno($input) >= 0) { # FIXME untested
+ if (fileno($input) >= 0) {
$in = $input;
- } else {
- $in = IO::File->new_tmpfile;
- while (1) {
- my $r = $input->read($buf, 8192);
- unless (defined $r) {
- $err->print('error reading input: ', $!, "\n");
- return r(500);
- }
- last if ($r == 0);
- $in->write($buf);
- }
- $in->flush;
- $in->sysseek(0, SEEK_SET);
+ } else { # FIXME untested
+ $in = input_to_file($env) or return r(500);
}
- my $out = IO::File->new_tmpfile;
- my $pid = fork; # TODO: vfork under Linux...
- unless (defined $pid) {
- $err->print('error forking: ', $!, "\n");
+ my ($rpipe, $wpipe);
+ unless (pipe($rpipe, $wpipe)) {
+ $err->print("error creating pipe: $!\n");
return r(500);
}
- if ($pid == 0) {
- # GIT_HTTP_EXPORT_ALL, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL
- # may be set in the server-process and are passed as-is
- foreach my $name (qw(QUERY_STRING
- REMOTE_USER REMOTE_ADDR
- HTTP_CONTENT_ENCODING
- CONTENT_TYPE
- SERVER_PROTOCOL
- REQUEST_METHOD)) {
- my $val = $env->{$name};
- $ENV{$name} = $val if defined $val;
- }
- # $ENV{GIT_PROJECT_ROOT} = $git->{git_dir};
- $ENV{GIT_HTTP_EXPORT_ALL} = '1';
- $ENV{PATH_TRANSLATED} = "$git->{git_dir}/$path";
- dup2(fileno($in), 0) or die "redirect stdin failed: $!\n";
- dup2(fileno($out), 1) or die "redirect stdout failed: $!\n";
- my @cmd = qw(git http-backend);
- exec(@cmd) or die 'exec `' . join(' ', @cmd). "' failed: $!\n";
+ my %env = %ENV;
+ # GIT_HTTP_EXPORT_ALL, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL
+ # may be set in the server-process and are passed as-is
+ foreach my $name (qw(QUERY_STRING
+ REMOTE_USER REMOTE_ADDR
+ HTTP_CONTENT_ENCODING
+ CONTENT_TYPE
+ SERVER_PROTOCOL
+ REQUEST_METHOD)) {
+ my $val = $env->{$name};
+ $env{$name} = $val if defined $val;
}
-
- if (waitpid($pid, 0) != $pid) {
- $err->print("git http-backend ($git->{git_dir}): ", $?, "\n");
+ my $git_dir = $git->{git_dir};
+ $env{GIT_HTTP_EXPORT_ALL} = '1';
+ $env{PATH_TRANSLATED} = "$git_dir/$path";
+ my %rdr = ( 0 => fileno($in), 1 => fileno($wpipe) );
+ my $pid = spawn([qw(git http-backend)], \%env, \%rdr);
+ unless (defined $pid) {
+ $err->print("error spawning: $!\n");
return r(500);
}
- $in = undef;
- $out->seek(0, SEEK_SET);
- my @h;
- my $code = 200;
- {
- local $/ = "\r\n";
- while (defined(my $line = <$out>)) {
- if ($line =~ /\AStatus:\s*(\d+)/) {
- $code = $1;
- } else {
- chomp $line;
- last if $line eq '';
- push @h, split(/:\s*/, $line, 2);
+ $wpipe = $in = undef;
+ $buf = '';
+ my ($vin, $fh, $res);
+ my $end = sub {
+ if ($fh) {
+ $fh->close;
+ $fh = undef;
+ } else {
+ $res->(r(500)) if $res;
+ }
+ if ($rpipe) {
+ $rpipe->close; # _may_ be Danga::Socket::close
+ $rpipe = undef;
+ }
+ if (defined $pid) {
+ my $wpid = $pid;
+ $pid = undef;
+ return if $wpid == waitpid($wpid, 0);
+ $err->print("git http-backend ($git_dir): $?\n");
+ }
+ };
+ my $fail = sub {
+ my ($e) = @_;
+ if ($e eq 'EAGAIN') {
+ select($vin, undef, undef, undef) if defined $vin;
+ # $vin is undef on async, so this is a noop on EAGAIN
+ return;
+ }
+ $end->();
+ $err->print("git http-backend ($git_dir): $e\n");
+ };
+ my $cb = sub { # read git-http-backend output and stream to client
+ my $r = $rpipe ? $rpipe->sysread($buf, 8192, length($buf)) : 0;
+ return $fail->($!{EAGAIN} ? 'EAGAIN' : $!) unless defined $r;
+ return $end->() if $r == 0; # EOF
+ if ($fh) { # stream body from git-http-backend to HTTP client
+ $fh->write($buf);
+ $buf = '';
+ } elsif ($buf =~ s/\A(.*?)\r?\n\r?\n//s) { # parse headers
+ my $h = $1;
+ my $code = 200;
+ my @h;
+ foreach my $l (split(/\r?\n/, $h)) {
+ my ($k, $v) = split(/:\s*/, $l, 2);
+ if ($k =~ /\AStatus\z/i) {
+ $code = int($v);
+ } else {
+ push @h, $k, $v;
+ }
}
+ # write response header:
+ $fh = $res->([ $code, \@h ]);
+ $res = undef;
+ $fh->write($buf);
+ $buf = '';
+ } # else { keep reading ... }
+ };
+ if (my $async = $env->{'pi-httpd.async'}) {
+ $rpipe = $async->($rpipe, $cb);
+ sub { ($res) = @_ } # let Danga::Socket handle the rest.
+ } else { # synchronous loop
+ $vin = '';
+ vec($vin, fileno($rpipe), 1) = 1;
+ sub {
+ ($res) = @_;
+ while ($rpipe) { $cb->() }
}
}
- return if $code == 403;
- sub {
- my ($cb) = @_;
- my $fh = $cb->([ $code, \@h ]);
- while (1) {
- my $r = $out->read($buf, 8192);
- die "$!\n" unless defined $r;
- last if ($r == 0);
- $fh->write($buf);
+}
+
+# FIXME: untested, our -httpd _always_ gives a real file handle
+sub input_to_file {
+ my ($env) = @_;
+ my $in = IO::File->new_tmpfile;
+ my $input = $env->{'psgi.input'};
+ my $buf;
+ while (1) {
+ my $r = $input->read($buf, 8192);
+ unless (defined $r) {
+ my $err = $env->{'psgi.errors'};
+ $err->print("error reading input: $!\n");
+ return;
}
- $fh->close;
+ last if ($r == 0);
+ $in->write($buf);
}
+ $in->flush;
+ $in->sysseek(0, SEEK_SET);
+ return $in;
}
1;