From 76916b4a41f4b72fa32d7d3bb93b6d83d602870f Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sun, 13 Jul 2025 00:08:33 +0000
Subject: [PATCH] listener: throttle errors for resource limits

We don't want to flood a system and run the log partition
out of space if we hit EMFILE/ENFILE/ENOMEM/ENOBUFS
---
 lib/PublicInbox/Listener.pm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/Listener.pm b/lib/PublicInbox/Listener.pm
index 624756000..364301d0f 100644
--- a/lib/PublicInbox/Listener.pm
+++ b/lib/PublicInbox/Listener.pm
@@ -5,6 +5,7 @@
 package PublicInbox::Listener;
 use v5.12;
 use parent 'PublicInbox::DS';
+use PublicInbox::DS qw(now);
 use Socket qw(SOL_SOCKET SO_KEEPALIVE IPPROTO_TCP TCP_NODELAY);
 use IO::Handle;
 use PublicInbox::Syscall qw(EPOLLIN EPOLLEXCLUSIVE);
@@ -40,7 +41,10 @@ sub event_step {
 			# ECONNABORTED is common with bad connections
 			return;
 		} elsif (my $sym = $ERR_WARN{int($!)}) {
-			return warn "W: accept(): $! ($sym)\n";
+			my $now = now;
+			return if $now < ($self->{next_warn} //= 0);
+			$self->{next_warn} = $now + 30;
+			return warn "W: accept(".fileno($sock)."): $! ($sym)\n";
 		} else {
 			return warn "BUG?: accept(): $!\n";
 		}
-- 
2.47.2