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https://github.com/tahoe-lafs/tahoe-lafs.git
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215 lines
8.0 KiB
Python
215 lines
8.0 KiB
Python
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# To check a particular Tahoe source distribution, this should be invoked from
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# the root directory of that distribution as
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#
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# bin/tahoe @misc/coding_tools/check-interfaces.py
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import os, sys, re
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import zope.interface as zi
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# We use the forked version of verifyClass below.
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#from zope.interface.verify import verifyClass
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from zope.interface.advice import addClassAdvisor
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interesting_modules = re.compile(r'(allmydata)|(foolscap)\..*')
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excluded_classnames = re.compile(r'(_)|(Mock)|(Fake)|(Dummy).*')
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excluded_file_basenames = re.compile(r'(check)|(bench)_.*')
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other_modules_with_violations = set()
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# deep magic
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def strictly_implements(*interfaces):
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frame = sys._getframe(1)
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f_locals = frame.f_locals
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# Try to make sure we were called from a class def. Assumes Python > 2.2.
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if f_locals is frame.f_globals or '__module__' not in f_locals:
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raise TypeError("implements can be used only from a class definition.")
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if '__implements_advice_data__' in f_locals:
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raise TypeError("implements can be used only once in a class definition.")
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def _implements_advice(cls):
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interfaces, classImplements = cls.__dict__['__implements_advice_data__']
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del cls.__implements_advice_data__
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classImplements(cls, *interfaces)
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if interesting_modules.match(cls.__module__):
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if not excluded_classnames.match(cls.__name__):
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for interface in interfaces:
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try:
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verifyClass(interface, cls)
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except Exception, e:
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print >>sys.stderr, ("%s.%s does not correctly implement %s.%s:\n%s"
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% (cls.__module__, cls.__name__,
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interface.__module__, interface.__name__, e))
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else:
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other_modules_with_violations.add(cls.__module__)
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return cls
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f_locals['__implements_advice_data__'] = interfaces, zi.classImplements
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addClassAdvisor(_implements_advice, depth=2)
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def check():
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# patchee-monkey
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zi.implements = strictly_implements
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# attempt to avoid side-effects from importing command scripts
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sys.argv = ['', '--help']
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# import modules under src/
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srcdir = 'src'
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for (dirpath, dirnames, filenames) in os.walk(srcdir):
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for fn in filenames:
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(basename, ext) = os.path.splitext(fn)
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if ext in ('.pyc', '.pyo') and not os.path.exists(os.path.join(dirpath, basename+'.py')):
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print >>sys.stderr, ("Warning: no .py source file for %r.\n"
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% (os.path.join(dirpath, fn),))
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if ext == '.py' and not excluded_file_basenames.match(basename):
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relpath = os.path.join(dirpath[len(srcdir)+1:], basename)
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module = relpath.replace(os.sep, '/').replace('/', '.')
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try:
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__import__(module)
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except ImportError:
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import traceback
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traceback.print_exc()
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print >>sys.stderr
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others = list(other_modules_with_violations)
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others.sort()
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print >>sys.stderr, "There were also interface violations in:\n", ", ".join(others), "\n"
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# Forked from
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# http://svn.zope.org/*checkout*/Zope3/trunk/src/zope/interface/verify.py?content-type=text%2Fplain&rev=27687
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# but modified to report all interface violations rather than just the first.
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##############################################################################
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#
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# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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"""Verify interface implementations
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$Id$
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"""
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from zope.interface.exceptions import BrokenImplementation, DoesNotImplement
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from zope.interface.exceptions import BrokenMethodImplementation
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from types import FunctionType, MethodType
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from zope.interface.interface import fromMethod, fromFunction, Method
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# This will be monkey-patched when running under Zope 2, so leave this
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# here:
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MethodTypes = (MethodType, )
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def _verify(iface, candidate, tentative=0, vtype=None):
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"""Verify that 'candidate' might correctly implements 'iface'.
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This involves:
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o Making sure the candidate defines all the necessary methods
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o Making sure the methods have the correct signature
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o Making sure the candidate asserts that it implements the interface
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Note that this isn't the same as verifying that the class does
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implement the interface.
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If optional tentative is true, suppress the "is implemented by" test.
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"""
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if vtype == 'c':
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tester = iface.implementedBy
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else:
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tester = iface.providedBy
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violations = []
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def format(e):
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return " " + str(e).strip() + "\n"
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if not tentative and not tester(candidate):
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violations.append(format(DoesNotImplement(iface)))
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# Here the `desc` is either an `Attribute` or `Method` instance
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for name, desc in iface.namesAndDescriptions(1):
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if not hasattr(candidate, name):
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if (not isinstance(desc, Method)) and vtype == 'c':
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# We can't verify non-methods on classes, since the
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# class may provide attrs in it's __init__.
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continue
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if isinstance(desc, Method):
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violations.append(" The %r method was not provided.\n" % (name,))
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else:
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violations.append(" The %r attribute was not provided.\n" % (name,))
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continue
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attr = getattr(candidate, name)
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if not isinstance(desc, Method):
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# If it's not a method, there's nothing else we can test
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continue
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if isinstance(attr, FunctionType):
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# should never get here, since classes should not provide functions
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meth = fromFunction(attr, iface, name=name)
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elif (isinstance(attr, MethodTypes)
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and type(attr.im_func) is FunctionType):
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meth = fromMethod(attr, iface, name)
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else:
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if not callable(attr):
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violations.append(format(BrokenMethodImplementation(name, "Not a method")))
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# sigh, it's callable, but we don't know how to intrspect it, so
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# we have to give it a pass.
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continue
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# Make sure that the required and implemented method signatures are
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# the same.
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desc = desc.getSignatureInfo()
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meth = meth.getSignatureInfo()
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mess = _incompat(desc, meth)
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if mess:
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violations.append(format(BrokenMethodImplementation(name, mess)))
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if violations:
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raise Exception("".join(violations))
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return True
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def verifyClass(iface, candidate, tentative=0):
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return _verify(iface, candidate, tentative, vtype='c')
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def verifyObject(iface, candidate, tentative=0):
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return _verify(iface, candidate, tentative, vtype='o')
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def _incompat(required, implemented):
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#if (required['positional'] !=
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# implemented['positional'][:len(required['positional'])]
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# and implemented['kwargs'] is None):
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# return 'imlementation has different argument names'
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if len(implemented['required']) > len(required['required']):
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return 'implementation requires too many arguments'
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if ((len(implemented['positional']) < len(required['positional']))
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and not implemented['varargs']):
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return "implementation doesn't allow enough arguments"
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if required['kwargs'] and not implemented['kwargs']:
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return "implementation doesn't support keyword arguments"
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if required['varargs'] and not implemented['varargs']:
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return "implementation doesn't support variable arguments"
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check()
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