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);
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} = $httpd;
45 sub event_read { # called by Danga::Socket
48 return event_read_input($self) if defined $self->{env};
50 my $off = length($self->{rbuf});
51 my $r = sysread($self->{sock}, $self->{rbuf}, 8192, $off);
53 return $self->close if $r == 0;
54 return rbuf_process($self);
56 return if $!{EAGAIN}; # no need to call watch_read(1) again
58 # common for clients to break connections without warning,
59 # would be too noisy to log here:
66 my %env = %{$self->{httpd}->{env}}; # full hash copy
67 my $r = parse_http_request($self->{rbuf}, \%env);
69 # We do not support Trailers in chunked requests, for now
70 # (they are rarely-used and git (as of 2.7.2) does not use them)
71 return quit($self, 400) if $r == -1 || $env{HTTP_TRAILER};
72 return $self->watch_read(1) if $r < 0; # incomplete
73 $self->{rbuf} = substr($self->{rbuf}, $r);
74 my $len = input_prepare($self, \%env);
75 $len ? event_read_input($self) : app_dispatch($self);
78 sub event_read_input ($) {
80 my $env = $self->{env};
81 return event_read_input_chunked($self) if env_chunked($env);
83 # env->{CONTENT_LENGTH} (identity)
84 my $sock = $self->{sock};
85 my $len = $self->{input_left};
86 $self->{input_left} = undef;
87 my $rbuf = \($self->{rbuf});
88 my $input = $env->{'psgi.input'};
92 my $w = write_in_full($input, $rbuf, $len);
93 return write_err($self) unless $w;
95 die "BUG: $len < 0 (w=$w)" if $len < 0;
96 if ($len == 0) { # next request may be pipelined
97 $$rbuf = substr($$rbuf, $w);
102 my $r = sysread($sock, $$rbuf, 8192);
103 return recv_err($self, $r, $len) unless $r;
104 # continue looping if $r > 0;
109 sub app_dispatch ($) {
111 $self->watch_read(0);
112 my $env = $self->{env};
113 $env->{REMOTE_ADDR} = $self->peer_ip_string; # Danga::Socket
114 $env->{REMOTE_PORT} = $self->{peer_port}; # set by peer_ip_string
115 if (my $host = $env->{HTTP_HOST}) {
116 $host =~ s/:(\d+)\z// and $env->{SERVER_PORT} = $1;
117 $env->{SERVER_NAME} = $host;
119 sysseek($env->{'psgi.input'}, 0, SEEK_SET) or die "input seek failed: $!";
120 my $res = Plack::Util::run_app($self->{httpd}->{app}, $env);
122 if (ref($res) eq 'CODE') {
123 $res->(sub { response_write($self, $env, $_[0]) });
125 response_write($self, $env, $res);
131 sub response_header_write {
132 my ($self, $env, $res) = @_;
133 my $proto = $env->{SERVER_PROTOCOL} or return; # HTTP/0.9 :P
134 my $status = $res->[0];
135 my $h = "$proto $status " . status_message($status) . "\r\n";
137 my $headers = $res->[1];
139 for (my $i = 0; $i < @$headers; $i += 2) {
140 my $k = $headers->[$i];
141 my $v = $headers->[$i + 1];
142 next if $k =~ /\A(?:Connection|Date)\z/i;
144 $len = $v if $k =~ /\AContent-Length\z/i;
145 if ($k =~ /\ATransfer-Encoding\z/i && $v =~ /\bchunked\b/i) {
152 my $conn = $env->{HTTP_CONNECTION} || '';
153 my $alive = (defined($len) || $chunked) &&
154 ($proto eq 'HTTP/1.1' && $conn !~ /\bclose\b/i) ||
155 ($conn =~ /\bkeep-alive\b/i);
157 $h .= 'Connection: ' . ($alive ? 'keep-alive' : 'close');
158 $h .= "\r\nDate: " . http_date() . "\r\n\r\n";
160 if (($len || $chunked) && $env->{REQUEST_METHOD} ne 'HEAD') {
169 my ($self, $env, $res) = @_;
170 my ($alive, $chunked) = response_header_write($self, $env, $res);
171 my $write = sub { $self->write($_[0]) };
174 $self->event_write; # watch for readability if done
176 $self->write(sub { $self->close });
178 $self->{env} = undef;
181 if (defined $res->[2]) {
182 Plack::Util::foreach($res->[2], $write);
185 # this is returned to the calling application:
186 Plack::Util::inline_object(write => $write, close => $close);
190 use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
193 if (MSG_MORE && !$self->{write_buf_size}) {
194 my $n = send($self->{sock}, $_[1], MSG_MORE);
196 my $dlen = length($_[1]);
197 return 1 if $n == $dlen; # all done!
198 $_[1] = substr($_[1], $n, $dlen - $n);
199 # fall through to normal write:
205 # overrides existing Danga::Socket method
208 # only continue watching for readability when we are done writing:
209 return if $self->write(undef) != 1;
211 if ($self->{rbuf} eq '') { # wait for next request
212 $self->watch_read(1);
213 } else { # avoid recursion for pipelined requests
214 Danga::Socket->AddTimer(0, sub { rbuf_process($self) });
219 my ($self, $env) = @_;
220 my $input = $null_io;
221 my $len = $env->{CONTENT_LENGTH};
223 $input = IO::File->new_tmpfile;
224 } elsif (env_chunked($env)) {
225 $input = IO::File->new_tmpfile;
229 $env->{'psgi.input'} = $input;
231 $self->{input_left} = $len;
234 sub env_chunked { ($_[0]->{HTTP_TRANSFER_ENCODING} || '') =~ /\bchunked\b/i }
238 my $err = $self->{env}->{'psgi.errors'};
239 my $msg = $! || '(zero write)';
240 $err->print("error buffering to input: $msg\n");
245 my ($self, $r, $len) = @_;
246 return $self->close if (defined $r && $r == 0);
248 $self->{input_left} = $len;
251 my $err = $self->{env}->{'psgi.errors'};
252 $err->print("error reading for input: $! ($len bytes remaining)\n");
257 my ($fh, $rbuf, $len) = @_;
261 my $w = syswrite($fh, $$rbuf, $len, $off);
262 return ($rv ? $rv : $w) unless $w; # undef or 0
270 sub event_read_input_chunked { # unlikely...
272 my $input = $self->{env}->{'psgi.input'};
273 my $sock = $self->{sock};
274 my $len = $self->{input_left};
275 $self->{input_left} = undef;
276 my $rbuf = \($self->{rbuf});
278 while (1) { # chunk start
279 if ($len == CHUNK_ZEND) {
280 return app_dispatch($self) if $$rbuf =~ s/\A\r\n//s;
281 return quit($self, 400) if length($$rbuf) > 2;
283 if ($len == CHUNK_END) {
284 if ($$rbuf =~ s/\A\r\n//s) {
286 } elsif (length($$rbuf) > 2) {
287 return quit($self, 400);
290 if ($len == CHUNK_START) {
291 if ($$rbuf =~ s/\A([a-f0-9]+).*?\r\n//i) {
293 } elsif (length($$rbuf) > CHUNK_MAX_HDR) {
294 return quit($self, 400);
296 # will break from loop since $len >= 0
299 if ($len < 0) { # chunk header is trickled, read more
300 my $off = length($$rbuf);
301 my $r = sysread($sock, $$rbuf, 8192, $off);
302 return recv_err($self, $r, $len) unless $r;
303 # (implicit) goto chunk_start if $r > 0;
305 $len = CHUNK_ZEND if $len == 0;
307 # drain the current chunk
310 my $w = write_in_full($input, $rbuf, $len);
311 return write_err($self) unless $w;
314 # we may have leftover data to parse
316 $$rbuf = substr($$rbuf, $w);
319 die "BUG: len < 0: $len";
325 # read more of current chunk
326 my $r = sysread($sock, $$rbuf, 8192);
327 return recv_err($self, $r, $len) unless $r;
334 my ($self, $status) = @_;
335 my $h = "HTTP/1.1 $status " . status_message($status) . "\r\n\r\n";
340 # callbacks for Danga::Socket
342 sub event_hup { $_[0]->close }
343 sub event_err { $_[0]->close }
345 # for graceful shutdown in PublicInbox::Daemon:
348 ($self->{rbuf} ne '' || $self->{env} || $self->{write_buf_size});