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From: Eric Wong <e@80x24.org>
To: yahns-public@yhbt.net
Subject: [PATCH 3/3] wbuf_lite: truncate StringIO when done
Date: Tue, 12 Jul 2016 21:41:03 +0000
Message-ID: <20160712214103.12282-4-e@80x24.org> (raw)
In-Reply-To: <20160712214103.12282-1-e@80x24.org>

And explain why this is doable for StringIO and not TmpIO,
which is file-backed.
---
 lib/yahns/wbuf_lite.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/yahns/wbuf_lite.rb b/lib/yahns/wbuf_lite.rb
index 2da5349..1902ce7 100644
--- a/lib/yahns/wbuf_lite.rb
+++ b/lib/yahns/wbuf_lite.rb
@@ -108,6 +108,12 @@ def wbuf_close(client)
   end
 
   def wbuf_abort
-    @tmpio = @tmpio.close if @tmpio
+    # we can safely truncate since this is a StringIO, we cannot do this
+    # with a real file because zero-copy with sendfile means truncating
+    # a while could clobber in-flight data
+    if @tmpio
+      @tmpio.truncate(0)
+      @tmpio = @tmpio.close
+    end
   end
 end
-- 
EW


      parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-12 21:41 [PATCH 0/3] maybe the last round of proxy_pass fixes before 1.13 Eric Wong
2016-07-12 21:41 ` [PATCH 1/3] test_proxy_pass_no_buffering: exclude rb/ru files, too Eric Wong
2016-07-12 21:41 ` [PATCH 2/3] wbuf_lite: use StringIO instead of TmpIO Eric Wong
2016-07-12 21:41 ` Eric Wong [this message]

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