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59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
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import functools
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from itertools import chain
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import logging
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import pprint
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from fig.packages import six
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def format_call(args, kwargs):
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args = (repr(a) for a in args)
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kwargs = ("{0!s}={1!r}".format(*item) for item in six.iteritems(kwargs))
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return "({0})".format(", ".join(chain(args, kwargs)))
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def format_return(result, max_lines):
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if isinstance(result, (list, tuple, set)):
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return "({0} with {1} items)".format(type(result).__name__, len(result))
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if result:
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lines = pprint.pformat(result).split('\n')
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extra = '\n...' if len(lines) > max_lines else ''
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return '\n'.join(lines[:max_lines]) + extra
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return result
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class VerboseProxy(object):
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"""Proxy all function calls to another class and log method name, arguments
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and return values for each call.
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"""
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def __init__(self, obj_name, obj, log_name=None, max_lines=10):
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self.obj_name = obj_name
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self.obj = obj
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self.max_lines = max_lines
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self.log = logging.getLogger(log_name or __name__)
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def __getattr__(self, name):
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attr = getattr(self.obj, name)
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if not six.callable(attr):
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return attr
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return functools.partial(self.proxy_callable, name)
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def proxy_callable(self, call_name, *args, **kwargs):
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self.log.info("%s %s <- %s",
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self.obj_name,
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call_name,
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format_call(args, kwargs))
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result = getattr(self.obj, call_name)(*args, **kwargs)
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self.log.info("%s %s -> %s",
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self.obj_name,
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call_name,
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format_return(result, self.max_lines))
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return result
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