mirror of
https://github.com/Grasscutters/mitmproxy.git
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578 lines
18 KiB
Python
578 lines
18 KiB
Python
import contextlib
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import blinker
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import blinker._saferef
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import pprint
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import copy
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import functools
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import os
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import typing
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import textwrap
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import ruamel.yaml
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from mitmproxy import exceptions
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from mitmproxy.utils import typecheck
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"""
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The base implementation for Options.
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"""
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unset = object()
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class _Option:
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__slots__ = ("name", "typespec", "value", "_default", "choices", "help")
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def __init__(
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self,
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name: str,
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typespec: typing.Union[type, object], # object for Optional[x], which is not a type.
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default: typing.Any,
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help: str,
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choices: typing.Optional[typing.Sequence[str]]
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) -> None:
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typecheck.check_option_type(name, default, typespec)
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self.name = name
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self.typespec = typespec
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self._default = default
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self.value = unset
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self.help = textwrap.dedent(help).strip().replace("\n", " ")
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self.choices = choices
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def __repr__(self):
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return "{value} [{type}]".format(value=self.current(), type=self.typespec)
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@property
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def default(self):
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return copy.deepcopy(self._default)
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def current(self) -> typing.Any:
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if self.value is unset:
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v = self.default
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else:
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v = self.value
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return copy.deepcopy(v)
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def set(self, value: typing.Any) -> None:
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typecheck.check_option_type(self.name, value, self.typespec)
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self.value = value
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def reset(self) -> None:
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self.value = unset
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def has_changed(self) -> bool:
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return self.current() != self.default
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def __eq__(self, other) -> bool:
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for i in self.__slots__:
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if getattr(self, i) != getattr(other, i):
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return False
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return True
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def __deepcopy__(self, _):
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o = _Option(
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self.name, self.typespec, self.default, self.help, self.choices
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)
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if self.has_changed():
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o.value = self.current()
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return o
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class OptManager:
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"""
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OptManager is the base class from which Options objects are derived.
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.changed is a blinker Signal that triggers whenever options are
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updated. If any handler in the chain raises an exceptions.OptionsError
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exception, all changes are rolled back, the exception is suppressed,
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and the .errored signal is notified.
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Optmanager always returns a deep copy of options to ensure that
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mutation doesn't change the option state inadvertently.
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"""
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def __init__(self):
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self.deferred: typing.Dict[str, str] = {}
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self.changed = blinker.Signal()
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self.errored = blinker.Signal()
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# Options must be the last attribute here - after that, we raise an
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# error for attribute assigment to unknown options.
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self._options: typing.Dict[str, typing.Any] = {}
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def add_option(
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self,
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name: str,
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typespec: typing.Union[type, object],
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default: typing.Any,
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help: str,
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choices: typing.Optional[typing.Sequence[str]] = None
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) -> None:
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self._options[name] = _Option(name, typespec, default, help, choices)
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self.changed.send(self, updated={name})
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@contextlib.contextmanager
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def rollback(self, updated, reraise=False):
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old = copy.deepcopy(self._options)
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try:
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yield
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except exceptions.OptionsError as e:
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# Notify error handlers
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self.errored.send(self, exc=e)
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# Rollback
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self.__dict__["_options"] = old
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self.changed.send(self, updated=updated)
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if reraise:
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raise e
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def subscribe(self, func, opts):
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"""
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Subscribe a callable to the .changed signal, but only for a
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specified list of options. The callable should accept arguments
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(options, updated), and may raise an OptionsError.
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The event will automatically be unsubscribed if the callable goes out of scope.
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"""
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for i in opts:
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if i not in self._options:
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raise exceptions.OptionsError("No such option: %s" % i)
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# We reuse blinker's safe reference functionality to cope with weakrefs
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# to bound methods.
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func = blinker._saferef.safe_ref(func)
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@functools.wraps(func)
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def _call(options, updated):
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if updated.intersection(set(opts)):
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f = func()
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if f:
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f(options, updated)
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else:
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self.changed.disconnect(_call)
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# Our wrapper function goes out of scope immediately, so we have to set
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# weakrefs to false. This means we need to keep our own weakref, and
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# clean up the hook when it's gone.
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self.changed.connect(_call, weak=False)
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def __eq__(self, other):
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if isinstance(other, OptManager):
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return self._options == other._options
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return False
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def __deepcopy__(self, memodict = None):
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o = OptManager()
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o.__dict__["_options"] = copy.deepcopy(self._options, memodict)
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return o
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__copy__ = __deepcopy__
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def __getattr__(self, attr):
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if attr in self._options:
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return self._options[attr].current()
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else:
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raise AttributeError("No such option: %s" % attr)
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def __setattr__(self, attr, value):
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# This is slightly tricky. We allow attributes to be set on the instance
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# until we have an _options attribute. After that, assignment is sent to
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# the update function, and will raise an error for unknown options.
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opts = self.__dict__.get("_options")
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if not opts:
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super().__setattr__(attr, value)
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else:
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self.update(**{attr: value})
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def keys(self):
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return set(self._options.keys())
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def items(self):
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return self._options.items()
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def __contains__(self, k):
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return k in self._options
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def reset(self):
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"""
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Restore defaults for all options.
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"""
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for o in self._options.values():
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o.reset()
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self.changed.send(self, updated=set(self._options.keys()))
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def update_known(self, **kwargs):
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"""
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Update and set all known options from kwargs. Returns a dictionary
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of unknown options.
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"""
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known, unknown = {}, {}
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for k, v in kwargs.items():
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if k in self._options:
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known[k] = v
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else:
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unknown[k] = v
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updated = set(known.keys())
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if updated:
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with self.rollback(updated, reraise=True):
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for k, v in known.items():
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self._options[k].set(v)
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self.changed.send(self, updated=updated)
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return unknown
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def update_defer(self, **kwargs):
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unknown = self.update_known(**kwargs)
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self.deferred.update(unknown)
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def update(self, **kwargs):
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u = self.update_known(**kwargs)
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if u:
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raise KeyError("Unknown options: %s" % ", ".join(u.keys()))
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def setter(self, attr):
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"""
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Generate a setter for a given attribute. This returns a callable
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taking a single argument.
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"""
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if attr not in self._options:
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raise KeyError("No such option: %s" % attr)
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def setter(x):
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setattr(self, attr, x)
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return setter
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def toggler(self, attr):
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"""
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Generate a toggler for a boolean attribute. This returns a callable
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that takes no arguments.
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"""
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if attr not in self._options:
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raise KeyError("No such option: %s" % attr)
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o = self._options[attr]
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if o.typespec != bool:
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raise ValueError("Toggler can only be used with boolean options")
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def toggle():
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setattr(self, attr, not getattr(self, attr))
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return toggle
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def default(self, option: str) -> typing.Any:
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return self._options[option].default
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def has_changed(self, option):
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"""
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Has the option changed from the default?
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"""
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return self._options[option].has_changed()
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def merge(self, opts):
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"""
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Merge a dict of options into this object. Options that have None
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value are ignored. Lists and tuples are appended to the current
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option value.
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"""
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toset = {}
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for k, v in opts.items():
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if v is not None:
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if isinstance(v, (list, tuple)):
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toset[k] = getattr(self, k) + v
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else:
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toset[k] = v
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self.update(**toset)
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def __repr__(self):
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options = pprint.pformat(self._options, indent=4).strip(" {}")
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if "\n" in options:
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options = "\n " + options + "\n"
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return "{mod}.{cls}({{{options}}})".format(
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mod=type(self).__module__,
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cls=type(self).__name__,
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options=options
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)
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def set(self, *spec, defer=False):
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"""
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Takes a list of set specification in standard form (option=value).
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Options that are known are updated immediately. If defer is true,
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options that are not known are deferred, and will be set once they
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are added.
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"""
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vals = {}
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unknown = {}
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for i in spec:
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parts = i.split("=", maxsplit=1)
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if len(parts) == 1:
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optname, optval = parts[0], None
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else:
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optname, optval = parts[0], parts[1]
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if optname in self._options:
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vals[optname] = self.parse_setval(self._options[optname], optval)
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else:
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unknown[optname] = optval
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if defer:
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self.deferred.update(unknown)
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elif unknown:
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raise exceptions.OptionsError("Unknown options: %s" % ", ".join(unknown.keys()))
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self.update(**vals)
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def process_deferred(self):
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"""
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Processes options that were deferred in previous calls to set, and
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have since been added.
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"""
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update = {}
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for optname, optval in self.deferred.items():
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if optname in self._options:
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optval = self.parse_setval(self._options[optname], optval)
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update[optname] = optval
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self.update(**update)
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for k in update.keys():
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del self.deferred[k]
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def parse_setval(self, o: _Option, optstr: typing.Optional[str]) -> typing.Any:
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"""
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Convert a string to a value appropriate for the option type.
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"""
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if o.typespec in (str, typing.Optional[str]):
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return optstr
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elif o.typespec in (int, typing.Optional[int]):
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if optstr:
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try:
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return int(optstr)
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except ValueError:
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raise exceptions.OptionsError("Not an integer: %s" % optstr)
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elif o.typespec == int:
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raise exceptions.OptionsError("Option is required: %s" % o.name)
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else:
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return None
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elif o.typespec == bool:
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if optstr == "toggle":
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return not o.current()
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if not optstr or optstr == "true":
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return True
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elif optstr == "false":
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return False
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else:
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raise exceptions.OptionsError(
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"Boolean must be \"true\", \"false\", or have the value " "omitted (a synonym for \"true\")."
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)
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elif o.typespec == typing.Sequence[str]:
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if not optstr:
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return []
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else:
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return getattr(self, o.name) + [optstr]
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raise NotImplementedError("Unsupported option type: %s", o.typespec)
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def make_parser(self, parser, optname, metavar=None, short=None):
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"""
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Auto-Create a command-line parser entry for a named option. If the
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option does not exist, it is ignored.
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"""
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if optname not in self._options:
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return
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o = self._options[optname]
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def mkf(l, s):
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l = l.replace("_", "-")
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f = ["--%s" % l]
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if s:
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f.append("-" + s)
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return f
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flags = mkf(optname, short)
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if o.typespec == bool:
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g = parser.add_mutually_exclusive_group(required=False)
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onf = mkf(optname, None)
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offf = mkf("no-" + optname, None)
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# The short option for a bool goes to whatever is NOT the default
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if short:
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if o.default:
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offf = mkf("no-" + optname, short)
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else:
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onf = mkf(optname, short)
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g.add_argument(
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*offf,
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action="store_false",
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dest=optname,
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)
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g.add_argument(
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*onf,
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action="store_true",
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dest=optname,
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help=o.help
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)
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parser.set_defaults(**{optname: None})
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elif o.typespec in (int, typing.Optional[int]):
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parser.add_argument(
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*flags,
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action="store",
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type=int,
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dest=optname,
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help=o.help,
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metavar=metavar,
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)
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elif o.typespec in (str, typing.Optional[str]):
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parser.add_argument(
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*flags,
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action="store",
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type=str,
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dest=optname,
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help=o.help,
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metavar=metavar,
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choices=o.choices
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)
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elif o.typespec == typing.Sequence[str]:
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parser.add_argument(
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*flags,
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action="append",
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type=str,
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dest=optname,
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help=o.help + " May be passed multiple times.",
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metavar=metavar,
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choices=o.choices,
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)
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else:
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raise ValueError("Unsupported option type: %s", o.typespec)
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def dump_defaults(opts):
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"""
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Dumps an annotated file with all options.
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"""
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# Sort data
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s = ruamel.yaml.comments.CommentedMap()
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for k in sorted(opts.keys()):
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o = opts._options[k]
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s[k] = o.default
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txt = o.help.strip()
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if o.choices:
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txt += " Valid values are %s." % ", ".join(repr(c) for c in o.choices)
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else:
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t = typecheck.typespec_to_str(o.typespec)
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txt += " Type %s." % t
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txt = "\n".join(textwrap.wrap(txt))
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s.yaml_set_comment_before_after_key(k, before="\n" + txt)
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return ruamel.yaml.round_trip_dump(s)
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def dump_dicts(opts, keys: typing.List[str]=None):
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"""
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Dumps the options into a list of dict object.
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Return: A list like: { "anticache": { type: "bool", default: false, value: true, help: "help text"} }
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"""
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options_dict = {}
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keys = keys if keys else opts.keys()
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for k in sorted(keys):
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o = opts._options[k]
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t = typecheck.typespec_to_str(o.typespec)
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option = {
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'type': t,
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'default': o.default,
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'value': o.current(),
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'help': o.help,
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'choices': o.choices
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}
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options_dict[k] = option
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return options_dict
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def parse(text):
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if not text:
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return {}
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try:
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data = ruamel.yaml.load(text, ruamel.yaml.RoundTripLoader)
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except ruamel.yaml.error.YAMLError as v:
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if hasattr(v, "problem_mark"):
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snip = v.problem_mark.get_snippet()
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raise exceptions.OptionsError(
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"Config error at line %s:\n%s\n%s" %
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(v.problem_mark.line + 1, snip, v.problem)
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)
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else:
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raise exceptions.OptionsError("Could not parse options.")
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if isinstance(data, str):
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raise exceptions.OptionsError("Config error - no keys found.")
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elif data is None:
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return {}
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return data
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|
|
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def load(opts: OptManager, text: str) -> None:
|
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"""
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Load configuration from text, over-writing options already set in
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this object. May raise OptionsError if the config file is invalid.
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"""
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data = parse(text)
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opts.update_defer(**data)
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|
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def load_paths(opts: OptManager, *paths: str) -> None:
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"""
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Load paths in order. Each path takes precedence over the previous
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path. Paths that don't exist are ignored, errors raise an
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OptionsError.
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"""
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for p in paths:
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p = os.path.expanduser(p)
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if os.path.exists(p) and os.path.isfile(p):
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with open(p, "rt", encoding="utf8") as f:
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try:
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txt = f.read()
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except UnicodeDecodeError as e:
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raise exceptions.OptionsError(
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"Error reading %s: %s" % (p, e)
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)
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try:
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load(opts, txt)
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except exceptions.OptionsError as e:
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raise exceptions.OptionsError(
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"Error reading %s: %s" % (p, e)
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)
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def serialize(opts: OptManager, text: str, defaults: bool = False) -> str:
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"""
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|
Performs a round-trip serialization. If text is not None, it is
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treated as a previous serialization that should be modified
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in-place.
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- If "defaults" is False, only options with non-default values are
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serialized. Default values in text are preserved.
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- Unknown options in text are removed.
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- Raises OptionsError if text is invalid.
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"""
|
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data = parse(text)
|
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for k in opts.keys():
|
|
if defaults or opts.has_changed(k):
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data[k] = getattr(opts, k)
|
|
for k in list(data.keys()):
|
|
if k not in opts._options:
|
|
del data[k]
|
|
ret = ruamel.yaml.round_trip_dump(data)
|
|
assert ret
|
|
return ret
|
|
|
|
|
|
def save(opts: OptManager, path: str, defaults: bool =False) -> None:
|
|
"""
|
|
Save to path. If the destination file exists, modify it in-place.
|
|
|
|
Raises OptionsError if the existing data is corrupt.
|
|
"""
|
|
path = os.path.expanduser(path)
|
|
if os.path.exists(path) and os.path.isfile(path):
|
|
with open(path, "rt", encoding="utf8") as f:
|
|
try:
|
|
data = f.read()
|
|
except UnicodeDecodeError as e:
|
|
raise exceptions.OptionsError(
|
|
"Error trying to modify %s: %s" % (path, e)
|
|
)
|
|
else:
|
|
data = ""
|
|
data = serialize(opts, data, defaults)
|
|
with open(path, "wt", encoding="utf8") as f:
|
|
f.write(data)
|