# Generic PSGI server for convenience. It aims to provide
# a consistent experience for public-inbox admins so they don't have
# to learn different ways to admin both NNTP and HTTP components.
-# There's nothing public-inbox-specific, here.
+# There's nothing which depends on public-inbox, here.
# Each instance of this class represents a HTTP client socket
package PublicInbox::HTTP;
use strict;
use warnings;
use base qw(Danga::Socket);
-use fields qw(httpd env rbuf input_left remote_addr remote_port);
+use fields qw(httpd env rbuf input_left remote_addr remote_port forward pull);
use Fcntl qw(:seek);
use Plack::HTTPParser qw(parse_http_request); # XS or pure Perl
use HTTP::Status qw(status_message);
use HTTP::Date qw(time2str);
+use Scalar::Util qw(weaken);
use IO::File;
use constant {
CHUNK_START => -1, # [a-f0-9]+\r\n
CHUNK_MAX_HDR => 256,
};
+my $pipelineq = [];
+my $pipet;
+sub process_pipelineq () {
+ my $q = $pipelineq;
+ $pipet = undef;
+ $pipelineq = [];
+ foreach (@$q) {
+ next if $_->{closed};
+ rbuf_process($_);
+ }
+}
+
# Use the same configuration parameter as git since this is primarily
# a slow-client sponge for git-http-backend
# TODO: support per-respository http.maxRequestBuffer somehow...
$self->{rbuf} = substr($self->{rbuf}, $r);
my $len = input_prepare($self, \%env);
- defined $len or return write_err($self); # EMFILE/ENFILE
+ defined $len or return write_err($self, undef); # EMFILE/ENFILE
$len ? event_read_input($self) : app_dispatch($self);
}
while ($len > 0) {
if ($$rbuf ne '') {
my $w = write_in_full($input, $rbuf, $len);
- return write_err($self) unless $w;
+ return write_err($self, $len) unless $w;
$len -= $w;
die "BUG: $len < 0 (w=$w)" if $len < 0;
if ($len == 0) { # next request may be pipelined
my $conn = $env->{HTTP_CONNECTION} || '';
my $term = defined($len) || $chunked;
- my $alive = $term &&
- (($proto eq 'HTTP/1.1' && $conn !~ /\bclose\b/i) ||
- ($conn =~ /\bkeep-alive\b/i));
-
- $h .= 'Connection: ' . ($alive ? 'keep-alive' : 'close');
- $h .= "\r\nDate: " . http_date() . "\r\n\r\n";
+ my $prot_persist = ($proto eq 'HTTP/1.1') && ($conn !~ /\bclose\b/i);
+ my $alive;
+ if (!$term && $prot_persist) { # auto-chunk
+ $chunked = $alive = 2;
+ $h .= "Transfer-Encoding: chunked\r\n";
+ # no need for "Connection: keep-alive" with HTTP/1.1
+ } elsif ($term && ($prot_persist || ($conn =~ /\bkeep-alive\b/i))) {
+ $alive = 1;
+ $h .= "Connection: keep-alive\r\n";
+ } else {
+ $alive = 0;
+ $h .= "Connection: close\r\n";
+ }
+ $h .= 'Date: ' . http_date() . "\r\n\r\n";
if (($len || $chunked) && $env->{REQUEST_METHOD} ne 'HEAD') {
more($self, $h);
$alive;
}
+# middlewares such as Deflater may write empty strings
+sub chunked_wcb ($) {
+ my ($self) = @_;
+ sub {
+ return if $_[0] eq '';
+ more($self, sprintf("%x\r\n", bytes::length($_[0])));
+ more($self, $_[0]);
+
+ # use $self->write("\n\n") if you care about real-time
+ # streaming responses, public-inbox WWW does not.
+ more($self, "\r\n");
+ }
+}
+
+sub identity_wcb ($) {
+ my ($self) = @_;
+ sub { $self->write(\($_[0])) if $_[0] ne '' }
+}
+
+sub next_request ($) {
+ my ($self) = @_;
+ $self->watch_write(0);
+ if ($self->{rbuf} eq '') { # wait for next request
+ $self->watch_read(1);
+ } else { # avoid recursion for pipelined requests
+ push @$pipelineq, $self;
+ $pipet ||= PublicInbox::EvCleanup::asap(*process_pipelineq);
+ }
+}
+
+sub response_done ($$) {
+ my ($self, $alive) = @_;
+ my $env = $self->{env};
+ $self->{env} = undef;
+ $self->write("0\r\n\r\n") if $alive == 2;
+ $self->write(sub { $alive ? next_request($self) : $self->close });
+}
+
+sub getline_response {
+ my ($self, $body, $write, $close) = @_;
+ $self->{forward} = $body;
+ weaken($self);
+ my $pull = $self->{pull} = sub {
+ local $/ = \8192;
+ my $forward = $self->{forward};
+ # limit our own running time for fairness with other
+ # clients and to avoid buffering too much:
+ while ($forward && defined(my $buf = $forward->getline)) {
+ $write->($buf);
+ last if $self->{closed};
+ if ($self->{write_buf_size}) {
+ $self->write($self->{pull});
+ } else {
+ PublicInbox::EvCleanup::asap($self->{pull});
+ }
+ return;
+ }
+ $self->{forward} = $self->{pull} = undef;
+ $forward->close if $forward; # avoid recursion
+ $close->();
+ };
+ $pull->();
+}
+
sub response_write {
my ($self, $env, $res) = @_;
my $alive = response_header_write($self, $env, $res);
- my $write = sub { $self->write($_[0]) };
- my $close = sub {
- if ($alive) {
- $self->event_write; # watch for readability if done
+
+ my $write = $alive == 2 ? chunked_wcb($self) : identity_wcb($self);
+ my $close = sub { response_done($self, $alive) };
+ if (defined(my $body = $res->[2])) {
+ if (ref $body eq 'ARRAY') {
+ $write->($_) foreach @$body;
+ $close->();
} else {
- $self->write(sub { $self->close });
+ getline_response($self, $body, $write, $close);
}
- $self->{env} = undef;
- };
-
- if (defined $res->[2]) {
- Plack::Util::foreach($res->[2], $write);
- $close->();
} else {
# this is returned to the calling application:
Plack::Util::inline_object(write => $write, close => $close);
use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
sub more ($$) {
my $self = $_[0];
+ return if $self->{closed};
if (MSG_MORE && !$self->{write_buf_size}) {
my $n = send($self->{sock}, $_[1], MSG_MORE);
if (defined $n) {
$self->write($_[1]);
}
-# overrides existing Danga::Socket method
-sub event_write {
- my ($self) = @_;
- # only continue watching for readability when we are done writing:
- return if $self->write(undef) != 1;
-
- if ($self->{rbuf} eq '') { # wait for next request
- $self->watch_read(1);
- } else { # avoid recursion for pipelined requests
- Danga::Socket->AddTimer(0, sub { rbuf_process($self) });
- }
-}
-
sub input_prepare {
my ($self, $env) = @_;
my $input = $null_io;
# TODO: expire idle clients on ENFILE / EMFILE
return unless $input;
- binmode $input;
$env->{'psgi.input'} = $input;
$self->{env} = $env;
$self->{input_left} = $len || 0;
sub env_chunked { ($_[0]->{HTTP_TRANSFER_ENCODING} || '') =~ /\bchunked\b/i }
sub write_err {
- my ($self) = @_;
+ my ($self, $len) = @_;
my $err = $self->{httpd}->{env}->{'psgi.errors'};
my $msg = $! || '(zero write)';
+ $msg .= " ($len bytes remaining)" if defined $len;
$err->print("error buffering to input: $msg\n");
quit($self, 500);
}
until ($len <= 0) {
if ($$rbuf ne '') {
my $w = write_in_full($input, $rbuf, $len);
- return write_err($self) unless $w;
+ return write_err($self, "$len chunk") if !$w;
$len -= $w;
if ($len == 0) {
# we may have leftover data to parse
sub close {
my $self = shift;
- $self->{env} = undef;
+ my $forward = $self->{forward};
+ my $env = $self->{env};
+ delete $env->{'psgix.io'} if $env; # prevent circular referernces
+ $self->{pull} = $self->{forward} = $self->{env} = undef;
+ $forward->close if $forward;
$self->SUPER::close(@_);
}
-sub write ($$) : method {
- my PublicInbox::HTTP $self = $_[0];
- return 1 if (defined($_[1]) && ref($_[1]) eq '' && $_[1] eq '');
-
- $self->SUPER::write($_[1]);
-}
-
# for graceful shutdown in PublicInbox::Daemon:
sub busy () {
my ($self) = @_;