X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FGitHTTPBackend.pm;h=09411048db25a8d4fcb41237d4285fa46abd9960;hb=cd50d183273c105a7f08b1875ba6f7a51d9f8e9a;hp=97834de4e97d00cb8b4e8ba4bd43faf058dfe4ee;hpb=97134b5a7fde92a2b55a6ec7ff3b44176e307cd7;p=public-inbox.git diff --git a/lib/PublicInbox/GitHTTPBackend.pm b/lib/PublicInbox/GitHTTPBackend.pm index 97834de4..09411048 100644 --- a/lib/PublicInbox/GitHTTPBackend.pm +++ b/lib/PublicInbox/GitHTTPBackend.pm @@ -1,20 +1,24 @@ -# Copyright (C) 2016 all contributors +# Copyright (C) 2016-2018 all contributors # License: AGPL-3.0+ # when no endpoints match, fallback to this and serve a static file -# or smart HTTP +# or smart HTTP. This is our wrapper for git-http-backend(1) package PublicInbox::GitHTTPBackend; use strict; use warnings; use Fcntl qw(:seek); -use IO::File; -use PublicInbox::Spawn qw(spawn); +use IO::Handle; use HTTP::Date qw(time2str); use HTTP::Status qw(status_message); +use Plack::Util; +use PublicInbox::Qspawn; + +# 32 is same as the git-daemon connection limit +my $default_limiter = PublicInbox::Qspawn::Limiter->new(32); # n.b. serving "description" and "cloneurl" should be innocuous enough to # not cause problems. serving "config" might... -my @text = qw[HEAD info/refs +my @text = qw[HEAD info/refs info/attributes objects/info/(?:http-alternates|alternates|packs) cloneurl description]; @@ -23,7 +27,7 @@ my @binary = qw! objects/pack/pack-[a-f0-9]{40}\.(?:pack|idx) !; -our $ANY = join('|', @binary, @text); +our $ANY = join('|', @binary, @text, 'git-upload-pack'); my $BIN = join('|', @binary); my $TEXT = join('|', @text); @@ -40,15 +44,20 @@ sub r ($;$) { } sub serve { - my ($cgi, $git, $path) = @_; + my ($env, $git, $path) = @_; + + # XXX compatibility... ugh, can we stop supporting this? + $git = PublicInbox::Git->new($git) unless ref($git); - my $service = $cgi->param('service') || ''; - if ($service =~ /\Agit-\w+-pack\z/ || $path =~ /\Agit-\w+-pack\z/) { - my $ok = serve_smart($cgi, $git, $path); + # Documentation/technical/http-protocol.txt in git.git + # requires one and exactly one query parameter: + if ($env->{QUERY_STRING} =~ /\Aservice=git-\w+-pack\z/ || + $path =~ /\Agit-\w+-pack\z/) { + my $ok = serve_smart($env, $git, $path); return $ok if $ok; } - serve_dumb($cgi, $git, $path); + serve_dumb($env, $git, $path); } sub err ($@) { @@ -58,47 +67,39 @@ sub err ($@) { sub drop_client ($) { if (my $io = $_[0]->{'psgix.io'}) { - $io->close; # this is Danga::Socket::close + $io->close; # this is PublicInbox::DS::close } } -sub serve_dumb { - my ($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 $prev = 0; +my $exp; +sub cache_one_year { + my ($h) = @_; + my $t = time + 31536000; + push @$h, 'Expires', $t == $prev ? $exp : ($exp = time2str($prev = $t)), + 'Cache-Control', 'public, max-age=31536000'; +} - my $f = "$git->{git_dir}/$path"; +sub static_result ($$$$) { + my ($env, $h, $f, $type) = @_; 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? open my $in, '<', $f or return r(404); + my $size = -s $in; my $len = $size; my $code = 200; - push @h, 'Content-Type', $type; + push @$h, 'Content-Type', $type; if (($env->{HTTP_RANGE} || '') =~ /\bbytes=(\d*)-(\d*)\z/) { - ($code, $len) = prepare_range($cgi, $in, \@h, $1, $2, $size); + ($code, $len) = prepare_range($env, $in, $h, $1, $2, $size); if ($code == 416) { - push @h, 'Content-Range', "bytes */$size"; - return [ 416, \@h, [] ]; + push @$h, 'Content-Range', "bytes */$size"; + return [ 416, $h, [] ]; } } - push @h, 'Content-Length', $len; + push @$h, 'Content-Length', $len; my $n = 65536; - [ $code, \@h, Plack::Util::inline_object(close => sub { close $in }, + [ $code, $h, Plack::Util::inline_object(close => sub { close $in }, getline => sub { return if $len == 0; $n = $len if $len < $n; @@ -117,8 +118,32 @@ sub serve_dumb { })] } +sub serve_dumb { + my ($env, $git, $path) = @_; + + my $h = []; + my $type; + if ($path =~ m!\Aobjects/[a-f0-9]{2}/[a-f0-9]{38}\z!) { + $type = 'application/x-git-loose-object'; + cache_one_year($h); + } elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.pack\z!) { + $type = 'application/x-git-packed-objects'; + cache_one_year($h); + } elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.idx\z!) { + $type = 'application/x-git-packed-objects-toc'; + cache_one_year($h); + } elsif ($path =~ /\A(?:$TEXT)\z/o) { + $type = 'text/plain'; + push @$h, @no_cache; + } else { + return r(404); + } + + static_result($env, $h, "$git->{git_dir}/$path", $type); +} + sub prepare_range { - my ($cgi, $in, $h, $beg, $end, $size) = @_; + my ($env, $in, $h, $beg, $end, $size) = @_; my $code = 200; my $len = $size; if ($beg eq '') { @@ -152,7 +177,7 @@ sub prepare_range { push @$h, "bytes $beg-$end/$size"; # FIXME: Plack::Middleware::Deflater bug? - $cgi->{env}->{'psgix.no-compress'} = 1; + $env->{'psgix.no-compress'} = 1; } } ($code, $len); @@ -160,18 +185,7 @@ sub prepare_range { # returns undef if 403 so it falls back to dumb HTTP sub serve_smart { - my ($cgi, $git, $path) = @_; - my $env = $cgi->{env}; - my $in = $env->{'psgi.input'}; - my $fd = eval { fileno($in) }; - unless (defined $fd && $fd >= 0) { - $in = input_to_file($env) or return r(500); - } - my ($rpipe, $wpipe); - unless (pipe($rpipe, $wpipe)) { - err($env, "error creating pipe: $! - going static"); - return; - } + my ($env, $git, $path) = @_; my %env = %ENV; # GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL # may be set in the server-process and are passed as-is @@ -184,84 +198,31 @@ sub serve_smart { my $val = $env->{$name}; $env{$name} = $val if defined $val; } - my $git_dir = $git->{git_dir}; + my $limiter = $git->{-httpbackend_limiter} || $default_limiter; $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; - my $end = sub { - $rpipe = undef; - my $e = $pid == waitpid($pid, 0) ? - $? : "PID:$pid still running?"; - if ($e) { - err($env, "git http-backend ($git_dir): $e"); - drop_client($env); - } - }; - - # Danga::Socket users, we queue up the read_enable callback to - # fire after pending writes are complete: - my $buf = ''; - if (my $async = $env->{'pi-httpd.async'}) { - my $res; - my $q = sub { - $async->close; - $end->(); - $res->(@_); - }; - # $async is PublicInbox::HTTPD::Async->new($rpipe, $cb) - $async = $async->($rpipe, sub { - my $r = sysread($rpipe, $buf, 1024, length($buf)); - if (!defined $r || $r == 0) { - return $q->(r(500, 'http-backend error')); - } - $r = parse_cgi_headers(\$buf) or return; - if ($r->[0] == 403) { - return $q->(serve_dumb($cgi, $git, $path)); - } - my $fh = $res->($r); - $fh->write($buf); - $buf = undef; - my $dst = Plack::Util::inline_object( - write => sub { $fh->write(@_) }, - close => sub { - $end->(); - $fh->close; - }); - $async->async_pass($env->{'psgix.io'}, $dst); - }); - sub { ($res) = @_ }; # let Danga::Socket handle the rest. - } else { # getline + close for other PSGI servers - my $r; - do { - $r = read($rpipe, $buf, 1024, length($buf)); - if (!defined $r || $r == 0) { - return r(500, 'http-backend error'); - } - $r = parse_cgi_headers(\$buf); - } until ($r); - return serve_dumb($cgi, $git, $path) if $r->[0] == 403; - $r->[2] = Plack::Util::inline_object( - close => sub { $end->() }, - getline => sub { - my $ret = $buf; - $buf = undef; - defined $ret ? $ret : $rpipe->getline; - }); - $r; - - } + $env{PATH_TRANSLATED} = "$git->{git_dir}/$path"; + my $rdr = input_prepare($env) or return r(500); + my $qsp = PublicInbox::Qspawn->new([qw(git http-backend)], \%env, $rdr); + $qsp->psgi_return($env, $limiter, sub { + my ($r, $bref) = @_; + my $res = parse_cgi_headers($r, $bref) or return; # incomplete + $res->[0] == 403 ? serve_dumb($env, $git, $path) : $res; + }); } -sub input_to_file { +sub input_prepare { my ($env) = @_; - my $in = IO::File->new_tmpfile; + my $input = $env->{'psgi.input'}; + my $fd = eval { fileno($input) }; + if (defined $fd && $fd >= 0) { + return { 0 => $fd }; + } + open(my $in, '+>', undef); + unless (defined $in) { + err($env, "could not open temporary file: $!"); + return; + } my $buf; while (1) { my $r = $input->read($buf, 8192); @@ -269,21 +230,34 @@ sub input_to_file { err($env, "error reading input: $!"); return; } - last if ($r == 0); - $in->write($buf); + last if $r == 0; + my $off = 0; + while ($r > 0) { + my $w = syswrite($in, $buf, $r, $off); + if (defined $w) { + $r -= $w; + $off += $w; + } else { + err($env, "error writing temporary file: $!"); + return; + } + } + } + unless (defined(sysseek($in, 0, SEEK_SET))) { + err($env, "error seeking temporary file: $!"); + return; } - $in->flush; - $in->sysseek(0, SEEK_SET); - return $in; + { 0 => fileno($in), -hold => $in }; } sub parse_cgi_headers { - my ($bref) = @_; - $$bref =~ s/\A(.*?)\r\n\r\n//s or return; + my ($r, $bref) = @_; + return r(500) unless defined $r && $r >= 0; + $$bref =~ s/\A(.*?)\r?\n\r?\n//s or return $r == 0 ? r(500) : undef; 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) { ($code) = ($v =~ /\b(\d+)\b/);