use strict;
use warnings;
use Fcntl qw(:seek);
-use POSIX qw(dup2);
+use IO::File;
+use PublicInbox::Spawn qw(spawn);
+use HTTP::Date qw(time2str);
# n.b. serving "description" and "cloneurl" should be innocuous enough to
# not cause problems. serving "config" might...
my $BIN = join('|', @binary);
my $TEXT = join('|', @text);
-sub r {
- [ $_[0] , [qw(Content-Type text/plain Content-Length 0) ], [] ]
+my @no_cache = ('Expires', 'Fri, 01 Jan 1980 00:00:00 GMT',
+ 'Pragma', 'no-cache',
+ 'Cache-Control', 'no-cache, max-age=0, must-revalidate');
+
+my $nextq;
+sub do_next () {
+ my $q = $nextq;
+ $nextq = undef;
+ while (my $cb = shift @$q) {
+ $cb->(); # this may redefine nextq
+ }
+}
+
+sub r ($) {
+ my ($s) = @_;
+ [ $s, [qw(Content-Type text/plain Content-Length 0), @no_cache ], [] ]
}
sub serve {
my ($cgi, $git, $path) = @_;
+
my $service = $cgi->param('service') || '';
if ($service =~ /\Agit-\w+-pack\z/ || $path =~ /\Agit-\w+-pack\z/) {
my $ok = serve_smart($cgi, $git, $path);
return $ok if $ok;
}
+ serve_dumb($cgi, $git, $path);
+}
+
+sub err ($@) {
+ my ($env, @msg) = @_;
+ $env->{'psgi.errors'}->print(@msg, "\n");
+}
+
+sub drop_client ($) {
+ if (my $io = $_[0]->{'psgix.io'}) {
+ $io->close; # this is Danga::Socket::close
+ }
+}
+
+sub serve_dumb {
+ my ($cgi, $git, $path) = @_;
+
+ my @h;
my $type;
if ($path =~ /\A(?:$BIN)\z/o) {
$type = 'application/octet-stream';
+ push @h, 'Expires', time2str(time + 31536000);
+ push @h, 'Cache-Control', 'public, max-age=31536000';
} elsif ($path =~ /\A(?:$TEXT)\z/o) {
$type = 'text/plain';
+ push @h, @no_cache;
} else {
return r(404);
}
+
my $f = "$git->{git_dir}/$path";
- return r(404) unless -f $f && -r _;
+ return r(404) unless -f $f && -r _; # just in case it's a FIFO :P
my @st = stat(_);
my $size = $st[7];
+ my $env = $cgi->{env};
- # TODO: If-Modified-Since and Last-Modified
+ # TODO: If-Modified-Since and Last-Modified?
open my $in, '<', $f or return r(404);
- my $code = 200;
my $len = $size;
- my @h;
-
- my $env = $cgi->{env};
- my $range = $env->{HTTP_RANGE};
- if (defined $range && $range =~ /\bbytes=(\d*)-(\d*)\z/) {
+ my $code = 200;
+ push @h, 'Content-Type', $type;
+ if (($env->{HTTP_RANGE} || '') =~ /\bbytes=(\d*)-(\d*)\z/) {
($code, $len) = prepare_range($cgi, $in, \@h, $1, $2, $size);
if ($code == 416) {
push @h, 'Content-Range', "bytes */$size";
return [ 416, \@h, [] ];
}
}
-
- push @h, 'Content-Type', $type, 'Content-Length', $len;
- sub {
- my ($res) = @_; # Plack callback
- my $fh = $res->([ $code, \@h ]);
- my $buf;
- my $n = 8192;
- while ($len > 0) {
+ push @h, 'Content-Length', $len;
+ my $n = 65536;
+ [ $code, \@h, Plack::Util::inline_object(close => sub { close $in },
+ getline => sub {
+ return if $len == 0;
$n = $len if $len < $n;
- my $r = read($in, $buf, $n);
- last if (!defined($r) || $r <= 0);
- $len -= $r;
- $fh->write($buf);
- }
- $fh->close;
- }
+ my $r = sysread($in, my $buf, $n);
+ if (!defined $r) {
+ err($env, "$f read error: $!");
+ } elsif ($r <= 0) {
+ err($env, "$f EOF with $len bytes left");
+ } else {
+ $len -= $r;
+ $n = 8192;
+ return $buf;
+ }
+ drop_client($env);
+ return;
+ })]
}
sub prepare_range {
if ($len <= 0) {
$code = 416;
} else {
- seek($in, $beg, SEEK_SET) or return [ 500, [], [] ];
+ sysseek($in, $beg, SEEK_SET) or return [ 500, [], [] ];
push @$h, qw(Accept-Ranges bytes Content-Range);
push @$h, "bytes $beg-$end/$size";
my $input = $env->{'psgi.input'};
my $buf;
my $in;
- my $err = $env->{'psgi.errors'};
- if (fileno($input) >= 0) {
+ my $fd = eval { fileno($input) };
+ if (defined $fd && $fd >= 0) {
$in = $input;
- } else { # FIXME untested
- $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 {
+ $in = input_to_file($env) or return r(500);
}
my ($rpipe, $wpipe);
unless (pipe($rpipe, $wpipe)) {
- $err->print("error creating pipe: $!\n");
- return r(500);
+ err($env, "error creating pipe: $! - going static");
+ return;
}
- my $pid = fork; # TODO: vfork under Linux...
- unless (defined $pid) {
- $err->print("error forking: $!\n");
- return r(500);
+ my %env = %ENV;
+ # 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;
}
my $git_dir = $git->{git_dir};
- if ($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_dir/$path";
- dup2(fileno($in), 0) or die "redirect stdin failed: $!\n";
- dup2(fileno($wpipe), 1) or die "redirect stdout failed: $!\n";
- my @cmd = qw(git http-backend);
- exec(@cmd) or die 'exec `' . join(' ', @cmd). "' failed: $!\n";
+ $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 $pid) {
+ err($env, "error spawning: $! - going static");
+ return;
}
$wpipe = $in = undef;
$buf = '';
my ($vin, $fh, $res);
+
+ # Danga::Socket users, we queue up the read_enable callback to
+ # fire after pending writes are complete:
+ my $pi_http = $env->{'psgix.io'};
+ my $read_enable = sub { $rpipe->watch_read(1) };
+ my $read_disable = sub {
+ $rpipe->watch_read(0);
+ $pi_http->write($read_enable);
+ };
+
my $end = sub {
if ($fh) {
$fh->close;
$fh = undef;
- } else {
- $res->(r(500)) if $res;
}
if ($rpipe) {
- $rpipe->close; # _may_ be Danga::Socket::close
+ # _may_ be Danga::Socket::close via
+ # PublicInbox::HTTPD::Async::close:
+ $rpipe->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 $e = $pid == waitpid($pid, 0) ?
+ $? : "PID:$pid still running?";
+ err($env, "git http-backend ($git_dir): $e") if $e;
}
+ return unless $res;
+ my $dumb = serve_dumb($cgi, $git, $path);
+ ref($dumb) eq 'ARRAY' ? $res->($dumb) : $dumb->($res);
};
my $fail = sub {
- my ($e) = @_;
- if ($e eq 'EAGAIN') {
+ if ($!{EAGAIN} || $!{EINTR}) {
select($vin, undef, undef, undef) if defined $vin;
# $vin is undef on async, so this is a noop on EAGAIN
return;
}
+ my $e = $!;
$end->();
- $err->print("git http-backend ($git_dir): $e\n");
+ err($env, "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 $fail->() 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
+ $read_disable->() if $read_disable;
+ } elsif ($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)) {
+ foreach my $l (split(/\r\n/, $h)) {
my ($k, $v) = split(/:\s*/, $l, 2);
if ($k =~ /\AStatus\z/i) {
- $code = int($v);
+ ($code) = ($v =~ /\b(\d+)\b/);
} else {
push @h, $k, $v;
}
}
- # write response header:
- $fh = $res->([ $code, \@h ]);
- $res = undef;
- $fh->write($buf);
+ if ($code == 403) {
+ # smart cloning disabled, serve dumbly
+ # in $end since we never undef $res in here
+ } else { # write response header:
+ $fh = $res->([ $code, \@h ]);
+ $res = undef;
+ $fh->write($buf);
+ }
$buf = '';
} # else { keep reading ... }
};
if (my $async = $env->{'pi-httpd.async'}) {
+ # $async is PublicInbox::HTTPD::Async->new($rpipe, $cb)
$rpipe = $async->($rpipe, $cb);
sub { ($res) = @_ } # let Danga::Socket handle the rest.
- } else { # synchronous loop
+ } else { # synchronous loop for other PSGI servers
+ $read_enable = $read_disable = undef;
$vin = '';
vec($vin, fileno($rpipe), 1) = 1;
sub {
}
}
+sub input_to_file {
+ my ($env) = @_;
+ my $in = IO::File->new_tmpfile;
+ my $input = $env->{'psgi.input'};
+ my $buf;
+ while (1) {
+ my $r = $input->read($buf, 8192);
+ unless (defined $r) {
+ err($env, "error reading input: $!");
+ return;
+ }
+ last if ($r == 0);
+ $in->write($buf);
+ }
+ $in->flush;
+ $in->sysseek(0, SEEK_SET);
+ return $in;
+}
+
1;