1 # Copyright (C) 2016 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 public-inbox-specific, 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);
16 use HTTP::Parser::XS qw(parse_http_request); # supports pure Perl fallback
17 use HTTP::Status qw(status_message);
18 use HTTP::Date qw(time2str);
21 CHUNK_START => -1, # [a-f0-9]+\r\n
22 CHUNK_END => -2, # \r\n
23 CHUNK_ZEND => -3, # \r\n
27 my $null_io = IO::File->new('/dev/null', '<');
32 $now == $prev ? $http_date : ($http_date = time2str($prev = $now));
36 my ($class, $sock, $addr, $httpd) = @_;
37 my $self = fields::new($class);
38 $self->SUPER::new($sock);
39 $self->{httpd} = $httpd;
41 ($self->{remote_addr}, $self->{remote_port}) =
42 PublicInbox::Daemon::host_with_port($addr);
47 sub event_read { # called by Danga::Socket
50 return event_read_input($self) if defined $self->{env};
52 my $off = length($self->{rbuf});
53 my $r = sysread($self->{sock}, $self->{rbuf}, 8192, $off);
55 return $self->close if $r == 0;
56 return rbuf_process($self);
58 return if $!{EAGAIN}; # no need to call watch_read(1) again
60 # common for clients to break connections without warning,
61 # would be too noisy to log here:
68 my %env = %{$self->{httpd}->{env}}; # full hash copy
69 my $r = parse_http_request($self->{rbuf}, \%env);
71 # We do not support Trailers in chunked requests, for now
72 # (they are rarely-used and git (as of 2.7.2) does not use them)
73 return quit($self, 400) if $r == -1 || $env{HTTP_TRAILER};
74 return $self->watch_read(1) if $r < 0; # incomplete
75 $self->{rbuf} = substr($self->{rbuf}, $r);
77 my $len = input_prepare($self, \%env);
78 defined $len or return write_err($self); # EMFILE/ENFILE
80 $len ? event_read_input($self) : app_dispatch($self);
83 sub event_read_input ($) {
85 my $env = $self->{env};
86 return event_read_input_chunked($self) if env_chunked($env);
88 # env->{CONTENT_LENGTH} (identity)
89 my $sock = $self->{sock};
90 my $len = $self->{input_left};
91 $self->{input_left} = undef;
92 my $rbuf = \($self->{rbuf});
93 my $input = $env->{'psgi.input'};
97 my $w = write_in_full($input, $rbuf, $len);
98 return write_err($self) unless $w;
100 die "BUG: $len < 0 (w=$w)" if $len < 0;
101 if ($len == 0) { # next request may be pipelined
102 $$rbuf = substr($$rbuf, $w);
107 my $r = sysread($sock, $$rbuf, 8192);
108 return recv_err($self, $r, $len) unless $r;
109 # continue looping if $r > 0;
114 sub app_dispatch ($) {
116 $self->watch_read(0);
117 my $env = $self->{env};
118 $env->{REMOTE_ADDR} = $self->{remote_addr};
119 $env->{REMOTE_PORT} = $self->{remote_port};
120 if (my $host = $env->{HTTP_HOST}) {
121 $host =~ s/:(\d+)\z// and $env->{SERVER_PORT} = $1;
122 $env->{SERVER_NAME} = $host;
125 sysseek($env->{'psgi.input'}, 0, SEEK_SET) or
126 die "BUG: psgi.input seek failed: $!";
128 my $res = Plack::Util::run_app($self->{httpd}->{app}, $env);
130 if (ref($res) eq 'CODE') {
131 $res->(sub { response_write($self, $env, $_[0]) });
133 response_write($self, $env, $res);
139 sub response_header_write {
140 my ($self, $env, $res) = @_;
141 my $proto = $env->{SERVER_PROTOCOL} or return; # HTTP/0.9 :P
142 my $status = $res->[0];
143 my $h = "$proto $status " . status_message($status) . "\r\n";
145 my $headers = $res->[1];
147 for (my $i = 0; $i < @$headers; $i += 2) {
148 my $k = $headers->[$i];
149 my $v = $headers->[$i + 1];
150 next if $k =~ /\A(?:Connection|Date)\z/i;
152 $len = $v if $k =~ /\AContent-Length\z/i;
153 if ($k =~ /\ATransfer-Encoding\z/i && $v =~ /\bchunked\b/i) {
160 my $conn = $env->{HTTP_CONNECTION} || '';
161 my $alive = (defined($len) || $chunked) &&
162 ($proto eq 'HTTP/1.1' && $conn !~ /\bclose\b/i) ||
163 ($conn =~ /\bkeep-alive\b/i);
165 $h .= 'Connection: ' . ($alive ? 'keep-alive' : 'close');
166 $h .= "\r\nDate: " . http_date() . "\r\n\r\n";
168 if (($len || $chunked) && $env->{REQUEST_METHOD} ne 'HEAD') {
177 my ($self, $env, $res) = @_;
178 my ($alive, $chunked) = response_header_write($self, $env, $res);
179 my $write = sub { $self->write($_[0]) };
182 $self->event_write; # watch for readability if done
184 $self->write(sub { $self->close });
186 $self->{env} = undef;
189 if (defined $res->[2]) {
190 Plack::Util::foreach($res->[2], $write);
193 # this is returned to the calling application:
194 Plack::Util::inline_object(write => $write, close => $close);
198 use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
201 if (MSG_MORE && !$self->{write_buf_size}) {
202 my $n = send($self->{sock}, $_[1], MSG_MORE);
204 my $dlen = length($_[1]);
205 return 1 if $n == $dlen; # all done!
206 $_[1] = substr($_[1], $n, $dlen - $n);
207 # fall through to normal write:
213 # overrides existing Danga::Socket method
216 # only continue watching for readability when we are done writing:
217 return if $self->write(undef) != 1;
219 if ($self->{rbuf} eq '') { # wait for next request
220 $self->watch_read(1);
221 } else { # avoid recursion for pipelined requests
222 Danga::Socket->AddTimer(0, sub { rbuf_process($self) });
227 my ($self, $env) = @_;
228 my $input = $null_io;
229 my $len = $env->{CONTENT_LENGTH};
231 $input = IO::File->new_tmpfile;
232 } elsif (env_chunked($env)) {
234 $input = IO::File->new_tmpfile;
237 # TODO: expire idle clients on ENFILE / EMFILE
238 return unless $input;
241 $env->{'psgi.input'} = $input;
243 $self->{input_left} = $len || 0;
246 sub env_chunked { ($_[0]->{HTTP_TRANSFER_ENCODING} || '') =~ /\bchunked\b/i }
250 my $err = $self->{env}->{'psgi.errors'};
251 my $msg = $! || '(zero write)';
252 $err->print("error buffering to input: $msg\n");
257 my ($self, $r, $len) = @_;
258 return $self->close if (defined $r && $r == 0);
260 $self->{input_left} = $len;
263 my $err = $self->{env}->{'psgi.errors'};
264 $err->print("error reading for input: $! ($len bytes remaining)\n");
269 my ($fh, $rbuf, $len) = @_;
273 my $w = syswrite($fh, $$rbuf, $len, $off);
274 return ($rv ? $rv : $w) unless $w; # undef or 0
282 sub event_read_input_chunked { # unlikely...
284 my $input = $self->{env}->{'psgi.input'};
285 my $sock = $self->{sock};
286 my $len = $self->{input_left};
287 $self->{input_left} = undef;
288 my $rbuf = \($self->{rbuf});
290 while (1) { # chunk start
291 if ($len == CHUNK_ZEND) {
292 return app_dispatch($self) if $$rbuf =~ s/\A\r\n//s;
293 return quit($self, 400) if length($$rbuf) > 2;
295 if ($len == CHUNK_END) {
296 if ($$rbuf =~ s/\A\r\n//s) {
298 } elsif (length($$rbuf) > 2) {
299 return quit($self, 400);
302 if ($len == CHUNK_START) {
303 if ($$rbuf =~ s/\A([a-f0-9]+).*?\r\n//i) {
305 } elsif (length($$rbuf) > CHUNK_MAX_HDR) {
306 return quit($self, 400);
308 # will break from loop since $len >= 0
311 if ($len < 0) { # chunk header is trickled, read more
312 my $off = length($$rbuf);
313 my $r = sysread($sock, $$rbuf, 8192, $off);
314 return recv_err($self, $r, $len) unless $r;
315 # (implicit) goto chunk_start if $r > 0;
317 $len = CHUNK_ZEND if $len == 0;
319 # drain the current chunk
322 my $w = write_in_full($input, $rbuf, $len);
323 return write_err($self) unless $w;
326 # we may have leftover data to parse
328 $$rbuf = substr($$rbuf, $w);
331 die "BUG: len < 0: $len";
337 # read more of current chunk
338 my $r = sysread($sock, $$rbuf, 8192);
339 return recv_err($self, $r, $len) unless $r;
346 my ($self, $status) = @_;
347 my $h = "HTTP/1.1 $status " . status_message($status) . "\r\n\r\n";
352 # callbacks for Danga::Socket
354 sub event_hup { $_[0]->close }
355 sub event_err { $_[0]->close }
357 # for graceful shutdown in PublicInbox::Daemon:
360 ($self->{rbuf} ne '' || $self->{env} || $self->{write_buf_size});