538 lines
17 KiB
Python
538 lines
17 KiB
Python
"""
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pytest PluginManager, basic initialization and tracing.
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"""
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import os
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import sys
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import inspect
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import py
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# don't import pytest to avoid circular imports
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assert py.__version__.split(".")[:2] >= ['1', '4'], ("installation problem: "
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"%s is too old, remove or upgrade 'py'" % (py.__version__))
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py3 = sys.version_info > (3,0)
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class TagTracer:
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def __init__(self):
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self._tag2proc = {}
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self.writer = None
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self.indent = 0
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def get(self, name):
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return TagTracerSub(self, (name,))
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def format_message(self, tags, args):
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if isinstance(args[-1], dict):
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extra = args[-1]
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args = args[:-1]
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else:
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extra = {}
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content = " ".join(map(str, args))
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indent = " " * self.indent
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lines = [
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"%s%s [%s]\n" %(indent, content, ":".join(tags))
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]
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for name, value in extra.items():
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lines.append("%s %s: %s\n" % (indent, name, value))
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return lines
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def processmessage(self, tags, args):
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if self.writer is not None and args:
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lines = self.format_message(tags, args)
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self.writer(''.join(lines))
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try:
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self._tag2proc[tags](tags, args)
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except KeyError:
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pass
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def setwriter(self, writer):
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self.writer = writer
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def setprocessor(self, tags, processor):
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if isinstance(tags, str):
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tags = tuple(tags.split(":"))
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else:
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assert isinstance(tags, tuple)
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self._tag2proc[tags] = processor
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class TagTracerSub:
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def __init__(self, root, tags):
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self.root = root
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self.tags = tags
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def __call__(self, *args):
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self.root.processmessage(self.tags, args)
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def setmyprocessor(self, processor):
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self.root.setprocessor(self.tags, processor)
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def get(self, name):
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return self.__class__(self.root, self.tags + (name,))
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def add_method_wrapper(cls, wrapper_func):
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""" Substitute the function named "wrapperfunc.__name__" at class
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"cls" with a function that wraps the call to the original function.
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Return an undo function which can be called to reset the class to use
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the old method again.
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wrapper_func is called with the same arguments as the method
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it wraps and its result is used as a wrap_controller for
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calling the original function.
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"""
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name = wrapper_func.__name__
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oldcall = getattr(cls, name)
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def wrap_exec(*args, **kwargs):
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gen = wrapper_func(*args, **kwargs)
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return wrapped_call(gen, lambda: oldcall(*args, **kwargs))
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setattr(cls, name, wrap_exec)
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return lambda: setattr(cls, name, oldcall)
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def wrapped_call(wrap_controller, func):
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""" Wrap calling to a function with a generator. The first yield
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will trigger calling the function and receive an according CallOutcome
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object representing an exception or a result. The generator then
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needs to finish (raise StopIteration) in order for the wrapped call
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to complete.
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"""
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try:
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next(wrap_controller) # first yield
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except StopIteration:
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return
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call_outcome = CallOutcome(func)
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try:
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wrap_controller.send(call_outcome)
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co = wrap_controller.gi_frame.f_code
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raise RuntimeError("wrap_controller for %r %s:%d has second yield" %
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(co.co_name, co.co_filename, co.co_firstlineno))
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except StopIteration:
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pass
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return call_outcome.get_result()
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class CallOutcome:
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excinfo = None
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def __init__(self, func):
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try:
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self.result = func()
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except Exception:
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self.excinfo = sys.exc_info()
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def force_result(self, result):
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self.result = result
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self.excinfo = None
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def get_result(self):
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if self.excinfo is None:
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return self.result
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else:
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ex = self.excinfo
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if py3:
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raise ex[1].with_traceback(ex[2])
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py.builtin._reraise(*ex)
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class PluginManager(object):
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def __init__(self, hookspecs=None, prefix="pytest_"):
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self._name2plugin = {}
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self._plugins = []
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self._conftestplugins = []
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self._warnings = []
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self.trace = TagTracer().get("pluginmanage")
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self._plugin_distinfo = []
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self._shutdown = []
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self.hook = HookRelay(hookspecs or [], pm=self, prefix=prefix)
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def set_tracing(self, writer):
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self.trace.root.setwriter(writer)
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# reconfigure HookCalling to perform tracing
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assert not hasattr(self, "_wrapping")
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self._wrapping = True
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def _docall(self, methods, kwargs):
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trace = self.hookrelay.trace
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trace.root.indent += 1
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trace(self.name, kwargs)
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box = yield
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if box.excinfo is None:
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trace("finish", self.name, "-->", box.result)
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trace.root.indent -= 1
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undo = add_method_wrapper(HookCaller, _docall)
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self.add_shutdown(undo)
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def do_configure(self, config):
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# backward compatibility
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config.do_configure()
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def set_register_callback(self, callback):
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assert not hasattr(self, "_registercallback")
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self._registercallback = callback
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def register(self, plugin, name=None, prepend=False, conftest=False):
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if self._name2plugin.get(name, None) == -1:
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return
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name = name or getattr(plugin, '__name__', str(id(plugin)))
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if self.isregistered(plugin, name):
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raise ValueError("Plugin already registered: %s=%s\n%s" %(
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name, plugin, self._name2plugin))
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#self.trace("registering", name, plugin)
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reg = getattr(self, "_registercallback", None)
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if reg is not None:
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reg(plugin, name) # may call addhooks
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self.hook._scan_plugin(plugin)
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self._name2plugin[name] = plugin
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if conftest:
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self._conftestplugins.append(plugin)
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else:
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if not prepend:
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self._plugins.append(plugin)
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else:
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self._plugins.insert(0, plugin)
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return True
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def unregister(self, plugin=None, name=None):
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if plugin is None:
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plugin = self.getplugin(name=name)
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try:
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self._plugins.remove(plugin)
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except KeyError:
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self._conftestplugins.remove(plugin)
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for name, value in list(self._name2plugin.items()):
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if value == plugin:
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del self._name2plugin[name]
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def add_shutdown(self, func):
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self._shutdown.append(func)
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def ensure_shutdown(self):
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while self._shutdown:
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func = self._shutdown.pop()
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func()
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self._plugins = self._conftestplugins = []
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self._name2plugin.clear()
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def isregistered(self, plugin, name=None):
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if self.getplugin(name) is not None:
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return True
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for val in self._name2plugin.values():
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if plugin == val:
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return True
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def addhooks(self, spec, prefix="pytest_"):
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self.hook._addhooks(spec, prefix=prefix)
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def getplugins(self):
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return self._plugins + self._conftestplugins
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def skipifmissing(self, name):
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if not self.hasplugin(name):
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import pytest
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pytest.skip("plugin %r is missing" % name)
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def hasplugin(self, name):
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return bool(self.getplugin(name))
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def getplugin(self, name):
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if name is None:
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return None
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try:
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return self._name2plugin[name]
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except KeyError:
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return self._name2plugin.get("_pytest." + name, None)
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# API for bootstrapping
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#
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def _envlist(self, varname):
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val = os.environ.get(varname, None)
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if val is not None:
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return val.split(',')
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return ()
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def consider_env(self):
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for spec in self._envlist("PYTEST_PLUGINS"):
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self.import_plugin(spec)
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def consider_setuptools_entrypoints(self):
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try:
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from pkg_resources import iter_entry_points, DistributionNotFound
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except ImportError:
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return # XXX issue a warning
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for ep in iter_entry_points('pytest11'):
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name = ep.name
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if name.startswith("pytest_"):
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name = name[7:]
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if ep.name in self._name2plugin or name in self._name2plugin:
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continue
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try:
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plugin = ep.load()
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except DistributionNotFound:
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continue
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self._plugin_distinfo.append((ep.dist, plugin))
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self.register(plugin, name=name)
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def consider_preparse(self, args):
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for opt1,opt2 in zip(args, args[1:]):
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if opt1 == "-p":
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self.consider_pluginarg(opt2)
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def consider_pluginarg(self, arg):
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if arg.startswith("no:"):
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name = arg[3:]
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if self.getplugin(name) is not None:
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self.unregister(None, name=name)
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self._name2plugin[name] = -1
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else:
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if self.getplugin(arg) is None:
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self.import_plugin(arg)
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def consider_conftest(self, conftestmodule):
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if self.register(conftestmodule, name=conftestmodule.__file__,
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conftest=True):
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self.consider_module(conftestmodule)
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def consider_module(self, mod):
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attr = getattr(mod, "pytest_plugins", ())
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if attr:
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if not isinstance(attr, (list, tuple)):
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attr = (attr,)
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for spec in attr:
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self.import_plugin(spec)
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def import_plugin(self, modname):
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assert isinstance(modname, str)
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if self.getplugin(modname) is not None:
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return
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try:
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mod = importplugin(modname)
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except KeyboardInterrupt:
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raise
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except ImportError:
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if modname.startswith("pytest_"):
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return self.import_plugin(modname[7:])
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raise
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except:
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e = sys.exc_info()[1]
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import pytest
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if not hasattr(pytest, 'skip') or not isinstance(e, pytest.skip.Exception):
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raise
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self._warnings.append("skipped plugin %r: %s" %((modname, e.msg)))
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else:
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self.register(mod, modname)
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self.consider_module(mod)
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def listattr(self, attrname, plugins=None):
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if plugins is None:
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plugins = self._plugins + self._conftestplugins
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l = []
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last = []
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wrappers = []
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for plugin in plugins:
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try:
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meth = getattr(plugin, attrname)
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except AttributeError:
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continue
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if hasattr(meth, 'hookwrapper'):
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wrappers.append(meth)
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elif hasattr(meth, 'tryfirst'):
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last.append(meth)
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elif hasattr(meth, 'trylast'):
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l.insert(0, meth)
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else:
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l.append(meth)
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l.extend(last)
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l.extend(wrappers)
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return l
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def call_plugin(self, plugin, methname, kwargs):
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return MultiCall(methods=self.listattr(methname, plugins=[plugin]),
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kwargs=kwargs, firstresult=True).execute()
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def importplugin(importspec):
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name = importspec
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try:
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mod = "_pytest." + name
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__import__(mod)
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return sys.modules[mod]
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except ImportError:
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__import__(importspec)
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return sys.modules[importspec]
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class MultiCall:
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""" execute a call into multiple python functions/methods. """
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def __init__(self, methods, kwargs, firstresult=False):
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self.methods = list(methods)
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self.kwargs = kwargs
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self.kwargs["__multicall__"] = self
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self.results = []
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self.firstresult = firstresult
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def __repr__(self):
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status = "%d results, %d meths" % (len(self.results), len(self.methods))
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return "<MultiCall %s, kwargs=%r>" %(status, self.kwargs)
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def execute(self):
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all_kwargs = self.kwargs
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while self.methods:
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method = self.methods.pop()
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args = [all_kwargs[argname] for argname in varnames(method)]
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if hasattr(method, "hookwrapper"):
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return wrapped_call(method(*args), self.execute)
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res = method(*args)
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if res is not None:
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self.results.append(res)
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if self.firstresult:
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return res
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if not self.firstresult:
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return self.results
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def varnames(func, startindex=None):
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""" return argument name tuple for a function, method, class or callable.
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In case of a class, its "__init__" method is considered.
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For methods the "self" parameter is not included unless you are passing
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an unbound method with Python3 (which has no supports for unbound methods)
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"""
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cache = getattr(func, "__dict__", {})
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try:
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return cache["_varnames"]
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except KeyError:
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pass
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if inspect.isclass(func):
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try:
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func = func.__init__
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except AttributeError:
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return ()
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startindex = 1
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else:
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if not inspect.isfunction(func) and not inspect.ismethod(func):
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func = getattr(func, '__call__', func)
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if startindex is None:
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startindex = int(inspect.ismethod(func))
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rawcode = py.code.getrawcode(func)
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try:
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x = rawcode.co_varnames[startindex:rawcode.co_argcount]
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except AttributeError:
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x = ()
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else:
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defaults = func.__defaults__
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if defaults:
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x = x[:-len(defaults)]
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try:
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cache["_varnames"] = x
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except TypeError:
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pass
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return x
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class HookRelay:
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def __init__(self, hookspecs, pm, prefix="pytest_"):
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if not isinstance(hookspecs, list):
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hookspecs = [hookspecs]
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self._pm = pm
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self.trace = pm.trace.root.get("hook")
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self.prefix = prefix
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for hookspec in hookspecs:
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self._addhooks(hookspec, prefix)
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def _addhooks(self, hookspec, prefix):
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added = False
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isclass = int(inspect.isclass(hookspec))
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for name, method in vars(hookspec).items():
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if name.startswith(prefix):
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firstresult = getattr(method, 'firstresult', False)
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hc = HookCaller(self, name, firstresult=firstresult,
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argnames=varnames(method, startindex=isclass))
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setattr(self, name, hc)
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added = True
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#print ("setting new hook", name)
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if not added:
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raise ValueError("did not find new %r hooks in %r" %(
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prefix, hookspec,))
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def _getcaller(self, name, plugins):
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caller = getattr(self, name)
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methods = self._pm.listattr(name, plugins=plugins)
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if methods:
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return caller.new_cached_caller(methods)
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return caller
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def _scan_plugin(self, plugin):
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def fail(msg, *args):
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name = getattr(plugin, '__name__', plugin)
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raise PluginValidationError("plugin %r\n%s" %(name, msg % args))
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for name in dir(plugin):
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if not name.startswith(self.prefix):
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continue
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hook = getattr(self, name, None)
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method = getattr(plugin, name)
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if hook is None:
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is_optional = getattr(method, 'optionalhook', False)
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if not isgenerichook(name) and not is_optional:
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fail("found unknown hook: %r", name)
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continue
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for arg in varnames(method):
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if arg not in hook.argnames:
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fail("argument %r not available\n"
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"actual definition: %s\n"
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"available hookargs: %s",
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arg, formatdef(method),
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", ".join(hook.argnames))
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getattr(self, name).clear_method_cache()
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class HookCaller:
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def __init__(self, hookrelay, name, firstresult, argnames, methods=None):
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self.hookrelay = hookrelay
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self.name = name
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self.firstresult = firstresult
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self.methods = methods
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self.argnames = ["__multicall__"]
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self.argnames.extend(argnames)
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assert "self" not in argnames # prevent oversights
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def new_cached_caller(self, methods):
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return HookCaller(self.hookrelay, self.name, self.firstresult,
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argnames=self.argnames, methods=methods)
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def __repr__(self):
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return "<HookCaller %r>" %(self.name,)
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def clear_method_cache(self):
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self.methods = None
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def __call__(self, **kwargs):
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methods = self.methods
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if methods is None:
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self.methods = methods = self.hookrelay._pm.listattr(self.name)
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return self._docall(methods, kwargs)
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def callextra(self, methods, **kwargs):
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return self._docall(self.methods + methods, kwargs)
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def _docall(self, methods, kwargs):
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return MultiCall(methods, kwargs,
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firstresult=self.firstresult).execute()
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class PluginValidationError(Exception):
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""" plugin failed validation. """
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def isgenerichook(name):
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return name == "pytest_plugins" or \
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name.startswith("pytest_funcarg__")
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def formatdef(func):
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|
return "%s%s" % (
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func.__name__,
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inspect.formatargspec(*inspect.getargspec(func))
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)
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