[PATCH 02/38] www: gzip_filter: implicitly flush {obuf} on zmore/zflush

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

This seems like the least disruptive way to allow more use of
->zmore when streaming large messages to sockets.
---
 lib/PublicInbox/CompressNoop.pm | 4 ++--
 lib/PublicInbox/GzipFilter.pm   | 9 +++++----
 lib/PublicInbox/ViewVCS.pm      | 2 --
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/lib/PublicInbox/CompressNoop.pm b/lib/PublicInbox/CompressNoop.pm
index e3301473..5135299f 100644
--- a/lib/PublicInbox/CompressNoop.pm
+++ b/lib/PublicInbox/CompressNoop.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
 # Provide the same methods as Compress::Raw::Zlib::Deflate but
@@ -10,7 +10,7 @@ use Compress::Raw::Zlib qw(Z_OK);
 sub new { bless \(my $self), __PACKAGE__ }
 
 sub deflate { # ($self, $input, $output)
-	$_[2] .= $_[1];
+	$_[2] .= ref($_[1]) ? ${$_[1]} : $_[1];
 	Z_OK;
 }
 
diff --git a/lib/PublicInbox/GzipFilter.pm b/lib/PublicInbox/GzipFilter.pm
index 86d34183..75ba625e 100644
--- a/lib/PublicInbox/GzipFilter.pm
+++ b/lib/PublicInbox/GzipFilter.pm
@@ -140,8 +140,8 @@ sub zmore {
 	my $self = $_[0]; # $_[1] => input
 	http_out($self);
 	my $err;
-	for (1..$#_) {
-		$err = $self->{gz}->deflate($_[$_], $self->{zbuf});
+	for (delete $self->{obuf}, @_[1..$#_]) {
+		$err = $self->{gz}->deflate($_ // next, $self->{zbuf});
 		die "gzip->deflate: $err" if $err != Z_OK;
 	}
 	undef;
@@ -153,8 +153,9 @@ sub zflush ($;@) {
 	my $zbuf = delete $self->{zbuf};
 	my $gz = delete $self->{gz};
 	my $err;
-	for (1..$#_) { # it's a bug iff $gz is undef w/ $_[1..]
-		$err = $gz->deflate($_[$_], $zbuf);
+	# it's a bug iff $gz is undef w/ $obuf or $_[1..]
+	for (delete $self->{obuf}, @_[1..$#_]) {
+		$err = $gz->deflate($_ // next, $zbuf);
 		die "gzip->deflate: $err" if $err != Z_OK;
 	}
 	$gz // return ''; # not a bug, recursing on DS->write failure
diff --git a/lib/PublicInbox/ViewVCS.pm b/lib/PublicInbox/ViewVCS.pm
index 3b4fa393..ed4a6454 100644
--- a/lib/PublicInbox/ViewVCS.pm
+++ b/lib/PublicInbox/ViewVCS.pm
@@ -210,8 +210,6 @@ EOM
 		$x =~ s/\r?\n/\n/gs;
 		$ctx->{-anchors} = {} if $x =~ /^diff --git /sm;
 		flush_diff($ctx, \$x); # undefs $x
-		$ctx->zmore($bdy);
-		undef $bdy;
 		# TODO: should there be another textarea which attempts to
 		# search for the exact email which was applied to make this
 		# commit?