user/dev discussion of public-inbox itself
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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 1/4] http: eliminate short-lived cyclic ref for psgix.io
Date: Fri, 24 Jan 2020 09:43:49 +0000
Message-ID: <20200124094352.19437-2-e@yhbt.net> (raw)
In-Reply-To: <20200124094352.19437-1-e@yhbt.net>

While there is no known actual leak due to reference cycles,
here, eliminating a potential source of leaks is helpful.
---
 Just a minor cleanup I noticed along the way.

 lib/PublicInbox/HTTP.pm | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index 32537153..b19a15d6 100644
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -80,7 +80,7 @@ sub event_step { # called by PublicInbox::DS
 	# only read more requests if we've drained the write buffer,
 	# otherwise we can be buffering infinitely w/o backpressure
 
-	return read_input($self) if defined $self->{env};
+	return read_input($self) if ref($self->{env});
 	my $rbuf = $self->{rbuf} // (\(my $x = ''));
 	$self->do_read($rbuf, 8192, bytes::length($$rbuf)) or return;
 	rbuf_process($self, $rbuf);
@@ -124,7 +124,6 @@ sub read_input ($;$) {
 	my ($self, $rbuf) = @_;
 	$rbuf //= $self->{rbuf} // (\(my $x = ''));
 	my $env = $self->{env};
-	return if $env->{REMOTE_ADDR}; # in app dispatch
 	return read_input_chunked($self, $rbuf) if env_chunked($env);
 
 	# env->{CONTENT_LENGTH} (identity)
@@ -153,6 +152,7 @@ sub app_dispatch {
 	my ($self, $input, $rbuf) = @_;
 	$self->rbuf_idle($rbuf);
 	my $env = $self->{env};
+	$self->{env} = undef; # for exists() check in ->busy
 	$env->{REMOTE_ADDR} = $self->{remote_addr};
 	$env->{REMOTE_PORT} = $self->{remote_port};
 	if (defined(my $host = $env->{HTTP_HOST})) {
@@ -455,7 +455,6 @@ sub quit {
 
 sub close {
 	my $self = $_[0];
-	delete $self->{env}; # prevent circular references
 	if (my $forward = delete $self->{forward}) {
 		eval { $forward->close };
 		err($self, "forward ->close error: $@") if $@;
@@ -466,7 +465,7 @@ sub close {
 # for graceful shutdown in PublicInbox::Daemon:
 sub busy () {
 	my ($self) = @_;
-	($self->{rbuf} || $self->{env} || $self->{wbuf});
+	($self->{rbuf} || exists($self->{env}) || $self->{wbuf});
 }
 
 # Chunked and Identity packages are used for writing responses.

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-24  9:43 [PATCH 0/4] -httpd static file improvements Eric Wong
2020-01-24  9:43 ` Eric Wong [this message]
2020-01-24  9:43 ` [PATCH 2/4] wwwstatic: offload error handling to PSGI server Eric Wong
2020-01-24  9:43 ` [PATCH 3/4] ds: tmpio: store offsets per-buffer Eric Wong
2020-01-24 19:07   ` Eric Wong
2020-01-24  9:43 ` [PATCH 4/4] wwwstatic: wire up buffer bypass for -httpd Eric Wong
2020-01-25 19:27   ` Eric Wong
2020-01-25 19:34   ` Eric Wong

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