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Fix caching error in the push evaluator

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Initialising `result` to `{}` in the parameters meant that every call to
_flatten_dict used the *same* target dictionary.

I'm hopeful this will fix https://github.com/matrix-org/synapse/issues/2270,
but I suspect it won't. (This code seems to have been here since forever,
unlike the bug, and I don't really think it explains the observed
behaviour). Still, it makes it hard to investigate the problem.
This commit is contained in:
Richard van der Hoff 2017-07-05 00:28:43 +01:00
parent cca94272fa
commit 73cfe48031
1 changed files with 3 additions and 1 deletions
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4
synapse/push/push_rule_evaluator.py
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@ -200,7 +200,9 @@ def _glob_to_re(glob, word_boundary):
return re.compile(r, flags=re.IGNORECASE)
def _flatten_dict(d, prefix=[], result={}):
def _flatten_dict(d, prefix=[], result=None):
if result is None:
result = {}
for key, value in d.items():
if isinstance(value, basestring):
result[".".join(prefix + [key])] = value.lower()