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from __future__ import absolute_import
try:
from collections.abc import Mapping
except ImportError:
# Python < 3.3
from collections import Mapping
from functools import update_wrapper
import threading
from raven.utils.compat import iteritems
def merge_dicts(*dicts):
out = {}
for d in dicts:
if not d:
continue
for k, v in iteritems(d):
out[k] = v
return out
def varmap(func, var, context=None, name=None):
"""
Executes ``func(key_name, value)`` on all values
recurisively discovering dict and list scoped
values.
"""
if context is None:
context = {}
objid = id(var)
if objid in context:
return func(name, '<...>')
context[objid] = 1
if isinstance(var, (list, tuple)) and not is_namedtuple(var):
ret = [varmap(func, f, context, name) for f in var]
else:
ret = func(name, var)
if isinstance(ret, Mapping):
ret = dict((k, varmap(func, v, context, k))
for k, v in iteritems(var))
del context[objid]
return ret
class memoize(object):
"""
Memoize the result of a property call.
>>> class A(object):
>>> @memoize
>>> def func(self):
>>> return 'foo'
"""
def __init__(self, func):
self.__name__ = func.__name__
self.__module__ = func.__module__
self.__doc__ = func.__doc__
self.func = func
def __get__(self, obj, type=None):
if obj is None:
return self
d, n = vars(obj), self.__name__
if n not in d:
d[n] = self.func(obj)
return d[n]
def once(func):
"""Runs a thing once and once only."""
lock = threading.Lock()
def new_func(*args, **kwargs):
if new_func.called:
return
with lock:
if new_func.called:
return
rv = func(*args, **kwargs)
new_func.called = True
return rv
new_func = update_wrapper(new_func, func)
new_func.called = False
return new_func
def is_namedtuple(value):
# https://stackoverflow.com/a/2166841/1843746
# But modified to handle subclasses of namedtuples.
if not isinstance(value, tuple):
return False
f = getattr(type(value), '_fields', None)
if not isinstance(f, tuple):
return False
return all(type(n) == str for n in f)
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