treewide: run update-copyrights from gnulib for 2019

[public-inbox.git] / lib / PublicInbox / HTTPD / Async.pm

diff --git a/lib/PublicInbox/HTTPD/Async.pm b/lib/PublicInbox/HTTPD/Async.pm
index d5628ee8d7ca8b457f9999ef118b18553dab61fd..35075d344b0c2848fb8b12efd014c01093b8aa54 100644 (file)
--- a/lib/PublicInbox/HTTPD/Async.pm
+++ b/lib/PublicInbox/HTTPD/Async.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2016-2019 all contributors <meta@public-inbox.org>
+# Copyright (C) 2016-2020 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
@@ -10,7 +10,7 @@ package PublicInbox::HTTPD::Async;
 use strict;
 use warnings;
 use base qw(PublicInbox::DS);
-use fields qw(cb end);
+use fields qw(http fh cb arg end_obj);
 use Errno qw(EAGAIN);
 use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
 
@@ -18,33 +18,37 @@ use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
 # $io is a read-only pipe ($rpipe) for now, but may be a
 # bidirectional socket in the future.
 sub new {
-       my ($class, $io, $cb, $end) = @_;
+       my ($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($cb);
-               die '$end unsupported w/o $io' if $end;
+               PublicInbox::DS::requeue($cb ? $cb : $arg);
+               die '$end_obj unsupported w/o $io' if $end_obj;
                return;
        }
 
        my $self = fields::new($class);
        IO::Handle::blocking($io, 0);
        $self->SUPER::new($io, EPOLLIN | EPOLLET);
-       $self->{cb} = $cb; # initial read callback, later replaced by main_cb
-       $self->{end} = $end; # like END {}, but only for this object
+       $self->{cb} = $cb; # initial read callback
+       $self->{arg} = $arg; # arg for $cb
+       $self->{end_obj} = $end_obj; # like END{}, can ->event_step
        $self;
 }
 
-sub main_cb ($$) {
-       my ($http, $fh) = @_;
-       sub {
-               my ($self) = @_;
+sub event_step {
+       my ($self) = @_;
+       if (my $cb = delete $self->{cb}) {
+               # this may call async_pass when headers are done
+               $cb->(delete $self->{arg});
+       } elsif (my $sock = $self->{sock}) {
+               my $http = $self->{http};
                # $self->{sock} is a read pipe for git-http-backend or cgit
                # and 65536 is the default Linux pipe size
-               my $r = sysread($self->{sock}, my $buf, 65536);
+               my $r = sysread($sock, my $buf, 65536);
                if ($r) {
-                       $fh->write($buf); # may call $http->close
+                       $self->{fh}->write($buf); # may call $http->close
                        if ($http->{sock}) { # !closed
                                $self->requeue;
                                # let other clients get some work done, too
@@ -56,11 +60,11 @@ sub main_cb ($$) {
                        return; # EPOLLET means we'll be notified
                }
 
-               # Done! Error handling will happen in $fh->close
-               # called by the {end} handler
+               # Done! Error handling will happen in $self->{fh}->close
+               # called by end_obj->event_step handler
                delete $http->{forward};
-               $self->close; # queues ->{end} to be called
-       }
+               $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
@@ -78,26 +82,24 @@ sub async_pass {
        # calls after this may use much memory:
        $$bref = undef;
 
-       # replace the header read callback with the main one
-       my $cb = $self->{cb} = main_cb($http, $fh);
-       $cb->($self); # either hit EAGAIN or ->requeue to keep EPOLLET happy
-}
+       $self->{http} = $http;
+       $self->{fh} = $fh;
 
-sub event_step {
-       # {cb} may be undef after ->requeue due to $http->close happening
-       my $cb = $_[0]->{cb} or return;
-       $cb->(@_);
+       # either hit EAGAIN or ->requeue to keep EPOLLET happy
+       event_step($self);
 }
 
-# may be called as $forward->close in PublicInbox::HTTP or EOF (main_cb)
+# may be called as $forward->close in PublicInbox::HTTP or EOF (event_step)
 sub close {
        my $self = $_[0];
-       delete $self->{cb};
        $self->SUPER::close; # DS::close
 
        # we defer this to the next timer loop since close is deferred
-       if (my $end = delete $self->{end}) {
-               PublicInbox::DS::requeue($end);
+       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);
        }
 }