Mercurial > hg
view tests/test-profile.t @ 14007:d764463b433e
atomictempfile: avoid infinite recursion in __del__().
The problem is that a programmer using atomictempfile directly can
make an innocent everyday mistake -- not enough args to the
constructor -- which escalates badly. You would expect a simple
TypeError crash in that case, but you actually get an infinite
recursion that is surprisingly difficult to kill: it happens between
__del__() and __getattr__(), and Python does not handle infinite
recursion from __del__() well.
The fix is to not implement __getattr__(), but instead assign instance
attributes for the methods we wish to delegate to the builtin file
type: write() and fileno(). I've audited mercurial.* and hgext.* and
found no users of atomictempfile using methods other than write() and
rename(). I audited third-party extensions and found one (snap)
passing an atomictempfile to util.fstat(), so I also threw in
fileno().
The last time I submitted a similar patch, Matt proposed that we make
atomictempfile a subclass of file instead of wrapping it. Rejected on
grounds of unnecessary complexity: for one thing, it would make the
Windows implementation of posixfile quite a bit more complex. It would
have to become a subclass of file rather than a simple function -- but
since it's written in C, this is non-obvious and non-trivial.
Furthermore, there's nothing wrong with wrapping objects and
delegating methods: it's a well-established pattern that works just
fine in many cases. Subclassing is not the answer to all of life's
problems.
author | Greg Ward <greg@gerg.ca> |
---|---|
date | Sun, 24 Apr 2011 19:25:10 -0400 |
parents | bb665db49e32 |
children | bb91c602d4ad |
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test --time $ hg --time help -q help 2>&1 | grep Time > /dev/null $ hg init a $ cd a test --profile $ if "$TESTDIR/hghave" -q lsprof; then > hg --profile st 2>../out || echo --profile failed > grep CallCount < ../out > /dev/null || echo wrong --profile > > hg --profile --config profiling.output=../out st 2>&1 \ > || echo --profile + output to file failed > grep CallCount < ../out > /dev/null \ > || echo wrong --profile output when saving to a file > > hg --profile --config profiling.format=text st 2>&1 \ > | grep CallCount > /dev/null || echo --profile format=text failed > > echo "[profiling]" >> $HGRCPATH > echo "format=kcachegrind" >> $HGRCPATH > > hg --profile st 2>../out || echo --profile format=kcachegrind failed > grep 'events: Ticks' < ../out > /dev/null || echo --profile output is wrong > > hg --profile --config profiling.output=../out st 2>&1 \ > || echo --profile format=kcachegrind + output to file failed > grep 'events: Ticks' < ../out > /dev/null \ > || echo --profile output is wrong > fi