httpd: move pipeline logic into event_step

Most of the HTTP server code was written for Danga::Socket and
not fully-transitioned to take advantage of PublicInbox::DS.
This change brings it up-to-date with the style of pipeline
handling used for -imapd and -nntpd.

diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index 8057481d1ce5629d17b0001d64d0f8f18d321304..0f4b5047784a75b5b9bba21797fbd6cc584851d5 100644 (file)
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -37,16 +37,6 @@ use constant {
 };
 use Errno qw(EAGAIN);
 
-my $pipelineq = [];
-sub process_pipelineq () {
-       my $q = $pipelineq;
-       $pipelineq = [];
-       foreach (@$q) {
-               next unless $_->{sock};
-               rbuf_process($_);
-       }
-}
-
 # 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...
@@ -86,32 +76,24 @@ sub event_step { # called by PublicInbox::DS
        # otherwise we can be buffering infinitely w/o backpressure
 
        return read_input($self) if ref($self->{env});
-       my $rbuf = $self->{rbuf} // (\(my $x = ''));
-       $self->do_read($rbuf, 8192, length($$rbuf)) or return;
-       rbuf_process($self, $rbuf);
-}
-
-sub rbuf_process {
-       my ($self, $rbuf) = @_;
-       $rbuf //= $self->{rbuf} // (\(my $x = ''));
 
+       my $rbuf = $self->{rbuf} // (\(my $x = ''));
        my %env = %{$self->{httpd}->{env}}; # full hash copy
-       my $r = parse_http_request($$rbuf, \%env);
-
-       # We do not support Trailers in chunked requests, for now
-       # (they are rarely-used and git (as of 2.7.2) does not use them)
-       if ($r == -1 || $env{HTTP_TRAILER} ||
-                       # this length-check is necessary for PURE_PERL=1:
-                       ($r == -2 && length($$rbuf) > 0x4000)) {
-               return quit($self, 400);
-       }
-       if ($r < 0) { # incomplete
-               $self->rbuf_idle($rbuf);
-               return $self->requeue;
+       my $r;
+       while (($r = parse_http_request($$rbuf, \%env)) < 0) {
+               # We do not support Trailers in chunked requests, for
+               # now (they are rarely-used and git (as of 2.7.2) does
+               # not use them).
+               # this length-check is necessary for PURE_PERL=1:
+               if ($r == -1 || $env{HTTP_TRAILER} ||
+                               ($r == -2 && length($$rbuf) > 0x4000)) {
+                       return quit($self, 400);
+               }
+               $self->do_read($rbuf, 8192, length($$rbuf)) or return;
        }
        $$rbuf = substr($$rbuf, $r);
-       my $len = input_prepare($self, \%env);
-       defined $len or return write_err($self, undef); # EMFILE/ENFILE
+       my $len = input_prepare($self, \%env) //
+               return write_err($self, undef); # EMFILE/ENFILE
 
        $len ? read_input($self, $rbuf) : app_dispatch($self, undef, $rbuf);
 }
@@ -238,22 +220,11 @@ sub identity_write ($$) {
        $self->write(\($_[1])) if $_[1] ne '';
 }
 
-sub next_request ($) {
-       my ($self) = @_;
-       if ($self->{rbuf}) {
-               # avoid recursion for pipelined requests
-               PublicInbox::DS::requeue(\&process_pipelineq) if !@$pipelineq;
-               push @$pipelineq, $self;
-       } else { # wait for next request
-               $self->requeue;
-       }
-}
-
 sub response_done {
        my ($self, $alive) = @_;
        delete $self->{env}; # we're no longer busy
        $self->write(\"0\r\n\r\n") if $alive == 2;
-       $self->write($alive ? \&next_request : \&close);
+       $self->write($alive ? $self->can('requeue') : \&close);
 }
 
 sub getline_pull {