[PATCH 11/30] qspawn: psgi_qx: eliminate anonymous subs

[Eric Wong <e@80x24.org>]

We can follow what we did in psgi_return to make psgi_qx
allocate less memory on each call.
---
 lib/PublicInbox/Qspawn.pm | 56 ++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 24 deletions(-)

diff --git a/lib/PublicInbox/Qspawn.pm b/lib/PublicInbox/Qspawn.pm
index 33e20147..9e161234 100644
--- a/lib/PublicInbox/Qspawn.pm
+++ b/lib/PublicInbox/Qspawn.pm
@@ -149,6 +149,37 @@ sub start ($$$) {
 	}
 }
 
+sub psgi_qx_init_cb {
+	my ($self) = @_;
+	my $async = delete $self->{async};
+	my ($r, $buf);
+	my $qx_fh = $self->{qx_fh};
+reread:
+	$r = sysread($self->{rpipe}, $buf, 65536);
+	if ($async) {
+		$async->async_pass($self->{psgi_env}->{'psgix.io'},
+					$qx_fh, \$buf);
+	} elsif (defined $r) {
+		$r ? $qx_fh->write($buf) : event_step($self, undef);
+	} else {
+		return if $! == EAGAIN; # try again when notified
+		goto reread if $! == EINTR;
+		event_step($self, $!);
+	}
+}
+
+sub psgi_qx_start {
+	my ($self) = @_;
+	if (my $async = $self->{psgi_env}->{'pi-httpd.async'}) {
+		# PublicInbox::HTTPD::Async->new(rpipe, $cb, cb_arg, $end_obj)
+		$self->{async} = $async->($self->{rpipe},
+					\&psgi_qx_init_cb, $self, $self);
+		# init_cb will call ->async_pass or ->close
+	} else { # generic PSGI
+		psgi_qx_init_cb($self) while $self->{qx_fh};
+	}
+}
+
 # Similar to `backtick` or "qx" ("perldoc -f qx"), it calls $qx_cb with
 # the stdout of the given command when done; but respects the given limiter
 # $env is the PSGI env.  As with ``/qx; only use this when output is small
@@ -162,31 +193,8 @@ sub psgi_qx {
 	$self->{qx_arg} = $qx_arg;
 	$self->{qx_fh} = $qx_fh;
 	$self->{qx_buf} = \$qx_buf;
-	my $async = $env->{'pi-httpd.async'};
-	my $cb = sub {
-		my ($r, $buf);
-reread:
-		$r = sysread($self->{rpipe}, $buf, 65536);
-		if ($async) {
-			$async->async_pass($env->{'psgix.io'}, $qx_fh, \$buf);
-		} elsif (defined $r) {
-			$r ? $qx_fh->write($buf) : event_step($self, undef);
-		} else {
-			return if $! == EAGAIN; # try again when notified
-			goto reread if $! == EINTR;
-			event_step($self, $!);
-		}
-	};
 	$limiter ||= $def_limiter ||= PublicInbox::Qspawn::Limiter->new(32);
-	$self->start($limiter, sub { # start_cb, may run later, much later...
-		if ($async) {
-		# PublicInbox::HTTPD::Async->new(rpipe, $cb, $end_obj)
-			$async = $async->($self->{rpipe}, $cb, undef, $self);
-			# $cb will call ->async_pass or ->close
-		} else { # generic PSGI
-			$cb->() while $self->{qx_fh};
-		}
-	});
+	start($self, $limiter, \&psgi_qx_start);
 }
 
 # create a filter for "push"-based streaming PSGI writes used by HTTPD::Async