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Diffstat (limited to 'lib/PublicInbox/HTTPD/Async.pm')
-rw-r--r-- | lib/PublicInbox/HTTPD/Async.pm | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/lib/PublicInbox/HTTPD/Async.pm b/lib/PublicInbox/HTTPD/Async.pm deleted file mode 100644 index 1651da88..00000000 --- a/lib/PublicInbox/HTTPD/Async.pm +++ /dev/null @@ -1,105 +0,0 @@ -# Copyright (C) 2016-2021 all contributors <meta@public-inbox.org> -# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt> -# -# XXX This is a totally unstable API for public-inbox internal use only -# This is exposed via the 'pi-httpd.async' key in the PSGI env hash. -# The name of this key is not even stable! -# Currently intended for use with read-only pipes with expensive -# processes such as git-http-backend(1), cgit(1) -# -# fields: -# http: PublicInbox::HTTP ref -# fh: PublicInbox::HTTP::{Identity,Chunked} ref (can ->write + ->close) -# cb: initial read callback -# arg: arg for {cb} -# end_obj: CODE or object which responds to ->event_step when ->close is called -package PublicInbox::HTTPD::Async; -use strict; -use parent qw(PublicInbox::DS); -use Errno qw(EAGAIN); -use PublicInbox::Syscall qw(EPOLLIN); - -# This is called via: $env->{'pi-httpd.async'}->() -# $io is a read-only pipe ($rpipe) for now, but may be a -# bidirectional socket in the future. -sub new { - my ($class, $io, $cb, $arg, $end_obj) = @_; - - # no $io? call $cb at the top of the next event loop to - # avoid recursion: - unless (defined($io)) { - PublicInbox::DS::requeue($cb ? $cb : $arg); - die '$end_obj unsupported w/o $io' if $end_obj; - return; - } - my $self = bless { - cb => $cb, # initial read callback - arg => $arg, # arg for $cb - end_obj => $end_obj, # like END{}, can ->event_step - }, $class; - my $pp = tied *$io; - $pp->{fh}->blocking(0) // die "$io->blocking(0): $!"; - $self->SUPER::new($io, EPOLLIN); -} - -sub event_step { - my ($self) = @_; - if (my $cb = delete $self->{cb}) { - # this may call async_pass when headers are done - $cb->(my $refcnt_guard = delete $self->{arg}); - } elsif (my $sock = $self->{sock}) { - my $http = $self->{http}; - # $self->{sock} is a read pipe for git-http-backend or cgit - # and 65536 is the default Linux pipe size - my $r = sysread($sock, my $buf, 65536); - if ($r) { - $self->{fh}->write($buf); # may call $http->close - # let other clients get some work done, too - return if $http->{sock}; # !closed - - # else: fall through to close below... - } elsif (!defined $r && $! == EAGAIN) { - return; # EPOLLIN means we'll be notified - } - - # Done! Error handling will happen in $self->{fh}->close - # called by end_obj->event_step handler - delete $http->{forward}; - $self->close; # queues end_obj->event_step to be called - } # else { # we may've been requeued but closed by $http -} - -# once this is called, all data we read is passed to the -# to the PublicInbox::HTTP instance ($http) via $fh->write -sub async_pass { - my ($self, $http, $fh, $bref) = @_; - # In case the client HTTP connection ($http) dies, it - # will automatically close this ($self) object. - $http->{forward} = $self; - - # write anything we overread when we were reading headers - $fh->write($$bref); # PublicInbox:HTTP::{chunked,identity}_wcb - - # we're done with this, free this memory up ASAP since the - # calls after this may use much memory: - $$bref = undef; - - $self->{http} = $http; - $self->{fh} = $fh; -} - -# may be called as $forward->close in PublicInbox::HTTP or EOF (event_step) -sub close { - my $self = $_[0]; - $self->SUPER::close; # DS::close - - # we defer this to the next timer loop since close is deferred - if (my $end_obj = delete $self->{end_obj}) { - # this calls $end_obj->event_step - # (likely PublicInbox::Qspawn::event_step, - # NOT PublicInbox::HTTPD::Async::event_step) - PublicInbox::DS::requeue($end_obj); - } -} - -1; |