1 # Copyright (C) 2016-2018 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Generic PSGI server for convenience. It aims to provide
5 # a consistent experience for public-inbox admins so they don't have
6 # to learn different ways to admin both NNTP and HTTP components.
7 # There's nothing which depends on public-inbox, here.
8 # Each instance of this class represents a HTTP client socket
10 package PublicInbox::HTTP;
13 use base qw(Danga::Socket);
14 use fields qw(httpd env rbuf input_left remote_addr remote_port forward pull);
15 use bytes (); # only for bytes::length
17 use Plack::HTTPParser qw(parse_http_request); # XS or pure Perl
18 use HTTP::Status qw(status_message);
19 use HTTP::Date qw(time2str);
22 CHUNK_START => -1, # [a-f0-9]+\r\n
23 CHUNK_END => -2, # \r\n
24 CHUNK_ZEND => -3, # \r\n
30 sub process_pipelineq () {
40 # Use the same configuration parameter as git since this is primarily
41 # a slow-client sponge for git-http-backend
42 # TODO: support per-respository http.maxRequestBuffer somehow...
43 our $MAX_REQUEST_BUFFER = $ENV{GIT_HTTP_MAX_REQUEST_BUFFER} ||
46 open(my $null_io, '<', '/dev/null') or die "failed to open /dev/null: $!";
51 $now == $prev ? $http_date : ($http_date = time2str($prev = $now));
55 my ($class, $sock, $addr, $httpd) = @_;
56 my $self = fields::new($class);
57 $self->SUPER::new($sock);
58 $self->{httpd} = $httpd;
60 ($self->{remote_addr}, $self->{remote_port}) =
61 PublicInbox::Daemon::host_with_port($addr);
66 sub event_read { # called by Danga::Socket
69 return event_read_input($self) if defined $self->{env};
71 my $off = length($self->{rbuf});
72 my $r = sysread($self->{sock}, $self->{rbuf}, 8192, $off);
74 return $self->close if $r == 0;
75 return rbuf_process($self);
77 return if $!{EAGAIN}; # no need to call watch_read(1) again
79 # common for clients to break connections without warning,
80 # would be too noisy to log here:
87 my %env = %{$self->{httpd}->{env}}; # full hash copy
88 my $r = parse_http_request($self->{rbuf}, \%env);
90 # We do not support Trailers in chunked requests, for now
91 # (they are rarely-used and git (as of 2.7.2) does not use them)
92 if ($r == -1 || $env{HTTP_TRAILER} ||
93 # this length-check is necessary for PURE_PERL=1:
94 ($r == -2 && length($self->{rbuf}) > 0x4000)) {
95 return quit($self, 400);
97 return $self->watch_read(1) if $r < 0; # incomplete
98 $self->{rbuf} = substr($self->{rbuf}, $r);
100 my $len = input_prepare($self, \%env);
101 defined $len or return write_err($self, undef); # EMFILE/ENFILE
103 $len ? event_read_input($self) : app_dispatch($self);
106 sub event_read_input ($) {
108 my $env = $self->{env};
109 return event_read_input_chunked($self) if env_chunked($env);
111 # env->{CONTENT_LENGTH} (identity)
112 my $sock = $self->{sock};
113 my $len = $self->{input_left};
114 $self->{input_left} = undef;
115 my $rbuf = \($self->{rbuf});
116 my $input = $env->{'psgi.input'};
120 my $w = write_in_full($input, $rbuf, $len);
121 return write_err($self, $len) unless $w;
123 die "BUG: $len < 0 (w=$w)" if $len < 0;
124 if ($len == 0) { # next request may be pipelined
125 $$rbuf = substr($$rbuf, $w);
130 my $r = sysread($sock, $$rbuf, 8192);
131 return recv_err($self, $r, $len) unless $r;
132 # continue looping if $r > 0;
134 app_dispatch($self, $input);
138 my ($self, $input) = @_;
139 $self->watch_read(0);
140 my $env = $self->{env};
141 $env->{REMOTE_ADDR} = $self->{remote_addr};
142 $env->{REMOTE_PORT} = $self->{remote_port};
143 if (my $host = $env->{HTTP_HOST}) {
144 $host =~ s/:(\d+)\z// and $env->{SERVER_PORT} = $1;
145 $env->{SERVER_NAME} = $host;
147 if (defined $input) {
148 sysseek($input, 0, SEEK_SET) or
149 die "BUG: psgi.input seek failed: $!";
151 # note: NOT $self->{sock}, we want our close (+ Danga::Socket::close),
152 # to do proper cleanup:
153 $env->{'psgix.io'} = $self; # only for ->close
154 my $res = Plack::Util::run_app($self->{httpd}->{app}, $env);
156 if (ref($res) eq 'CODE') {
157 $res->(sub { response_write($self, $env, $_[0]) });
159 response_write($self, $env, $res);
165 sub response_header_write {
166 my ($self, $env, $res) = @_;
167 my $proto = $env->{SERVER_PROTOCOL} or return; # HTTP/0.9 :P
168 my $status = $res->[0];
169 my $h = "$proto $status " . status_message($status) . "\r\n";
171 my $headers = $res->[1];
173 for (my $i = 0; $i < @$headers; $i += 2) {
174 my $k = $headers->[$i];
175 my $v = $headers->[$i + 1];
176 next if $k =~ /\A(?:Connection|Date)\z/i;
178 $len = $v if $k =~ /\AContent-Length\z/i;
179 if ($k =~ /\ATransfer-Encoding\z/i && $v =~ /\bchunked\b/i) {
185 my $conn = $env->{HTTP_CONNECTION} || '';
186 my $term = defined($len) || $chunked;
187 my $prot_persist = ($proto eq 'HTTP/1.1') && ($conn !~ /\bclose\b/i);
189 if (!$term && $prot_persist) { # auto-chunk
190 $chunked = $alive = 2;
191 $h .= "Transfer-Encoding: chunked\r\n";
192 # no need for "Connection: keep-alive" with HTTP/1.1
193 } elsif ($term && ($prot_persist || ($conn =~ /\bkeep-alive\b/i))) {
195 $h .= "Connection: keep-alive\r\n";
198 $h .= "Connection: close\r\n";
200 $h .= 'Date: ' . http_date() . "\r\n\r\n";
202 if (($len || $chunked) && $env->{REQUEST_METHOD} ne 'HEAD') {
210 # middlewares such as Deflater may write empty strings
211 sub chunked_wcb ($) {
214 return if $_[0] eq '';
215 more($self, sprintf("%x\r\n", bytes::length($_[0])));
218 # use $self->write("\n\n") if you care about real-time
219 # streaming responses, public-inbox WWW does not.
224 sub identity_wcb ($) {
226 sub { $self->write(\($_[0])) if $_[0] ne '' }
229 sub next_request ($) {
231 $self->watch_write(0);
232 if ($self->{rbuf} eq '') { # wait for next request
233 $self->watch_read(1);
234 } else { # avoid recursion for pipelined requests
235 push @$pipelineq, $self;
236 $pipet ||= PublicInbox::EvCleanup::asap(*process_pipelineq);
240 sub response_done_cb ($$) {
241 my ($self, $alive) = @_;
243 my $env = $self->{env};
244 $self->{env} = undef;
245 $self->write("0\r\n\r\n") if $alive == 2;
246 $self->write(sub{$alive ? next_request($self) : $self->close});
250 sub getline_cb ($$$) {
251 my ($self, $write, $close) = @_;
253 my $forward = $self->{forward};
254 # limit our own running time for fairness with other
255 # clients and to avoid buffering too much:
257 my $buf = eval { $forward->getline };
259 $write->($buf); # may close in Danga::Socket::write
260 unless ($self->{closed}) {
261 my $next = $self->{pull};
262 if ($self->{write_buf_size}) {
265 PublicInbox::EvCleanup::asap($next);
270 err($self, "response ->getline error: $@");
276 $self->{forward} = $self->{pull} = undef;
279 eval { $forward->close };
281 err($self, "response ->close error: $@");
282 $self->close; # idempotent
288 sub getline_response ($$$) {
289 my ($self, $write, $close) = @_;
290 my $pull = $self->{pull} = sub { getline_cb($self, $write, $close) };
295 my ($self, $env, $res) = @_;
296 my $alive = response_header_write($self, $env, $res);
297 my $close = response_done_cb($self, $alive);
298 my $write = $alive == 2 ? chunked_wcb($self) : identity_wcb($self);
299 if (defined(my $body = $res->[2])) {
300 if (ref $body eq 'ARRAY') {
301 $write->($_) foreach @$body;
304 $self->{forward} = $body;
305 getline_response($self, $write, $close);
308 # this is returned to the calling application:
309 Plack::Util::inline_object(write => $write, close => $close);
313 use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
316 return if $self->{closed};
317 if (MSG_MORE && !$self->{write_buf_size}) {
318 my $n = send($self->{sock}, $_[1], MSG_MORE);
320 my $nlen = length($_[1]) - $n;
321 return 1 if $nlen == 0; # all done!
323 # Danga::Socket::write queues the unwritten substring:
324 return $self->write(substr($_[1], $n, $nlen));
331 my ($self, $env) = @_;
333 my $len = $env->{CONTENT_LENGTH};
335 if ($len > $MAX_REQUEST_BUFFER) {
339 open($input, '+>', undef);
340 } elsif (env_chunked($env)) {
342 open($input, '+>', undef);
347 # TODO: expire idle clients on ENFILE / EMFILE
348 return unless $input;
350 $env->{'psgi.input'} = $input;
352 $self->{input_left} = $len || 0;
355 sub env_chunked { ($_[0]->{HTTP_TRANSFER_ENCODING} || '') =~ /\bchunked\b/i }
358 eval { $_[0]->{httpd}->{env}->{'psgi.errors'}->print($_[1]."\n") };
362 my ($self, $len) = @_;
363 my $msg = $! || '(zero write)';
364 $msg .= " ($len bytes remaining)" if defined $len;
365 err($self, "error buffering to input: $msg");
370 my ($self, $r, $len) = @_;
371 return $self->close if (defined $r && $r == 0);
373 $self->{input_left} = $len;
376 err($self, "error reading for input: $! ($len bytes remaining)");
381 my ($fh, $rbuf, $len) = @_;
385 my $w = syswrite($fh, $$rbuf, $len, $off);
386 return ($rv ? $rv : $w) unless $w; # undef or 0
394 sub event_read_input_chunked { # unlikely...
396 my $input = $self->{env}->{'psgi.input'};
397 my $sock = $self->{sock};
398 my $len = $self->{input_left};
399 $self->{input_left} = undef;
400 my $rbuf = \($self->{rbuf});
402 while (1) { # chunk start
403 if ($len == CHUNK_ZEND) {
404 $$rbuf =~ s/\A\r\n//s and
405 return app_dispatch($self, $input);
406 return quit($self, 400) if length($$rbuf) > 2;
408 if ($len == CHUNK_END) {
409 if ($$rbuf =~ s/\A\r\n//s) {
411 } elsif (length($$rbuf) > 2) {
412 return quit($self, 400);
415 if ($len == CHUNK_START) {
416 if ($$rbuf =~ s/\A([a-f0-9]+).*?\r\n//i) {
418 if (($len + -s $input) > $MAX_REQUEST_BUFFER) {
419 return quit($self, 413);
421 } elsif (length($$rbuf) > CHUNK_MAX_HDR) {
422 return quit($self, 400);
424 # will break from loop since $len >= 0
427 if ($len < 0) { # chunk header is trickled, read more
428 my $off = length($$rbuf);
429 my $r = sysread($sock, $$rbuf, 8192, $off);
430 return recv_err($self, $r, $len) unless $r;
431 # (implicit) goto chunk_start if $r > 0;
433 $len = CHUNK_ZEND if $len == 0;
435 # drain the current chunk
438 my $w = write_in_full($input, $rbuf, $len);
439 return write_err($self, "$len chunk") if !$w;
442 # we may have leftover data to parse
444 $$rbuf = substr($$rbuf, $w);
447 die "BUG: len < 0: $len";
453 # read more of current chunk
454 my $r = sysread($sock, $$rbuf, 8192);
455 return recv_err($self, $r, $len) unless $r;
462 my ($self, $status) = @_;
463 my $h = "HTTP/1.1 $status " . status_message($status) . "\r\n\r\n";
468 # callbacks for Danga::Socket
470 sub event_hup { $_[0]->close }
471 sub event_err { $_[0]->close }
475 my $forward = $self->{forward};
476 my $env = $self->{env};
477 delete $env->{'psgix.io'} if $env; # prevent circular references
478 $self->{pull} = $self->{forward} = $self->{env} = undef;
480 eval { $forward->close };
481 err($self, "forward ->close error: $@") if $@;
483 $self->SUPER::close(@_);
486 # for graceful shutdown in PublicInbox::Daemon:
489 ($self->{rbuf} ne '' || $self->{env} || $self->{write_buf_size});