From: Didip Kerabat <didip@didip-osx.local>
Date: Mon, 10 Jan 2011 19:56:28 +0000 (-0800)
Subject: reset() only set current position back to 0. What we want here is truncate().
X-Git-Tag: v1.2.0~46^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bba5a45c3f3e5d4bc24e0ba8e30f4a55b5468b7f;p=thirdparty%2Ftornado.git

reset() only set current position back to 0. What we want here is truncate().

But, per http://stackoverflow.com/questions/4330812/how-do-i-clear-a-stringio-object discussion, creating new StringIO() is cheaper.
---

diff --git a/tornado/iostream.py b/tornado/iostream.py
index 8e8adfe2a..74c9325c7 100644
--- a/tornado/iostream.py
+++ b/tornado/iostream.py
@@ -338,7 +338,7 @@ class IOStream(object):
                 # of bytes it was able to process.
                 buffered_string = self._write_buffer.getvalue()
                 num_bytes = self.socket.send(buffered_string[:128 * 1024])
-                self._write_buffer.reset()
+                self._write_buffer = StringIO()
                 self._write_buffer.write(buffered_string[num_bytes:])
             except socket.error, e:
                 if e.args[0] in (errno.EWOULDBLOCK, errno.EAGAIN):
@@ -355,7 +355,7 @@ class IOStream(object):
 
     def _consume(self, loc):
         buffered_string = self._read_buffer.getvalue()
-        self._read_buffer.reset()
+        self._read_buffer = StringIO()
         self._read_buffer.write(buffered_string[loc:])
         return buffered_string[:loc]