1 files changed, 37 insertions, 0 deletions
diff --git a/lib/PublicInbox/InputPipe.pm b/lib/PublicInbox/InputPipe.pm
new file mode 100644
index 00000000..a8bdf031
--- /dev/null
+++ b/lib/PublicInbox/InputPipe.pm
@@ -0,0 +1,37 @@
+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# for reading pipes and sockets off the DS event loop
+package PublicInbox::InputPipe;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::DS);
+use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
+
+sub consume {
+        my ($in, $cb, @args) = @_;
+        my $self = bless { cb => $cb, sock => $in, args => \@args },__PACKAGE__;
+        if ($PublicInbox::DS::in_loop) {
+                eval { $self->SUPER::new($in, EPOLLIN|EPOLLET) };
+                return $in->blocking(0) unless $@; # regular file sets $@
+        }
+        event_step($self) while $self->{sock};
+}
+
+sub event_step {
+        my ($self) = @_;
+        my ($r, $rbuf);
+        while (($r = sysread($self->{sock}, $rbuf, 65536))) {
+                $self->{cb}->(@{$self->{args} // []}, $rbuf);
+        }
+        if (defined($r)) { # EOF
+                $self->{cb}->(@{$self->{args} // []}, '');
+        } elsif ($!{EAGAIN}) {
+                return;
+        } else {
+                $self->{cb}->(@{$self->{args} // []}, undef)
+        }
+        $self->{sock}->blocking ? delete($self->{sock}) : $self->close
+}
+
+1;