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Edit File : cfgv.py \| Size : 11.93 KB
from __future__ import annotations import collections import contextlib import os.path import re import sys class ValidationError(ValueError): def __init__(self, error_msg, ctx=None): super().__init__(error_msg) self.error_msg = error_msg self.ctx = ctx def __str__(self): out = '\n' err = self while err.ctx is not None: out += f'==> {err.ctx}\n' err = err.error_msg out += f'=====> {err.error_msg}' return out MISSING = collections.namedtuple('Missing', ())() type(MISSING).__repr__ = lambda self: 'MISSING' @contextlib.contextmanager def validate_context(msg): try: yield except ValidationError as e: _, _, tb = sys.exc_info() raise ValidationError(e, ctx=msg).with_traceback(tb) from None @contextlib.contextmanager def reraise_as(tp): try: yield except ValidationError as e: _, _, tb = sys.exc_info() raise tp(e).with_traceback(tb) from None def _dct_noop(self, dct): pass def _check_optional(self, dct): if self.key not in dct: return with validate_context(f'At key: {self.key}'): self.check_fn(dct[self.key]) def _apply_default_optional(self, dct): dct.setdefault(self.key, self.default) def _remove_default_optional(self, dct): if dct.get(self.key, MISSING) == self.default: del dct[self.key] def _require_key(self, dct): if self.key not in dct: raise ValidationError(f'Missing required key: {self.key}') def _check_required(self, dct): _require_key(self, dct) _check_optional(self, dct) @property def _check_fn_recurse(self): def check_fn(val): validate(val, self.schema) return check_fn def _apply_default_required_recurse(self, dct): dct[self.key] = apply_defaults(dct[self.key], self.schema) def _remove_default_required_recurse(self, dct): dct[self.key] = remove_defaults(dct[self.key], self.schema) def _apply_default_optional_recurse(self, dct): if self.key not in dct: _apply_default_optional(self, dct) _apply_default_required_recurse(self, dct) def _remove_default_optional_recurse(self, dct): if self.key in dct: _remove_default_required_recurse(self, dct) _remove_default_optional(self, dct) def _get_check_conditional(inner): def _check_conditional(self, dct): if dct.get(self.condition_key, MISSING) == self.condition_value: inner(self, dct) elif ( self.condition_key in dct and self.ensure_absent and self.key in dct ): if hasattr(self.condition_value, 'describe_opposite'): explanation = self.condition_value.describe_opposite() else: explanation = f'is not {self.condition_value!r}' raise ValidationError( f'Expected {self.key} to be absent when {self.condition_key} ' f'{explanation}, found {self.key}: {dct[self.key]!r}', ) return _check_conditional def _apply_default_conditional_optional(self, dct): if dct.get(self.condition_key, MISSING) == self.condition_value: _apply_default_optional(self, dct) def _remove_default_conditional_optional(self, dct): if dct.get(self.condition_key, MISSING) == self.condition_value: _remove_default_optional(self, dct) def _apply_default_conditional_recurse(self, dct): if dct.get(self.condition_key, MISSING) == self.condition_value: _apply_default_required_recurse(self, dct) def _remove_default_conditional_recurse(self, dct): if dct.get(self.condition_key, MISSING) == self.condition_value: _remove_default_required_recurse(self, dct) def _no_additional_keys_check(self, dct): extra = sorted(set(dct) - set(self.keys)) if extra: extra_s = ', '.join(str(x) for x in extra) keys_s = ', '.join(str(x) for x in self.keys) raise ValidationError( f'Additional keys found: {extra_s}. ' f'Only these keys are allowed: {keys_s}', ) def _warn_additional_keys_check(self, dct): extra = sorted(set(dct) - set(self.keys)) if extra: self.callback(extra, self.keys, dct) Required = collections.namedtuple('Required', ('key', 'check_fn')) Required.check = _check_required Required.apply_default = _dct_noop Required.remove_default = _dct_noop RequiredRecurse = collections.namedtuple('RequiredRecurse', ('key', 'schema')) RequiredRecurse.check = _check_required RequiredRecurse.check_fn = _check_fn_recurse RequiredRecurse.apply_default = _apply_default_required_recurse RequiredRecurse.remove_default = _remove_default_required_recurse Optional = collections.namedtuple('Optional', ('key', 'check_fn', 'default')) Optional.check = _check_optional Optional.apply_default = _apply_default_optional Optional.remove_default = _remove_default_optional OptionalRecurse = collections.namedtuple( 'OptionalRecurse', ('key', 'schema', 'default'), ) OptionalRecurse.check = _check_optional OptionalRecurse.check_fn = _check_fn_recurse OptionalRecurse.apply_default = _apply_default_optional_recurse OptionalRecurse.remove_default = _remove_default_optional_recurse OptionalNoDefault = collections.namedtuple( 'OptionalNoDefault', ('key', 'check_fn'), ) OptionalNoDefault.check = _check_optional OptionalNoDefault.apply_default = _dct_noop OptionalNoDefault.remove_default = _dct_noop Conditional = collections.namedtuple( 'Conditional', ('key', 'check_fn', 'condition_key', 'condition_value', 'ensure_absent'), ) Conditional.__new__.__defaults__ = (False,) Conditional.check = _get_check_conditional(_check_required) Conditional.apply_default = _dct_noop Conditional.remove_default = _dct_noop ConditionalOptional = collections.namedtuple( 'ConditionalOptional', ( 'key', 'check_fn', 'default', 'condition_key', 'condition_value', 'ensure_absent', ), ) ConditionalOptional.__new__.__defaults__ = (False,) ConditionalOptional.check = _get_check_conditional(_check_optional) ConditionalOptional.apply_default = _apply_default_conditional_optional ConditionalOptional.remove_default = _remove_default_conditional_optional ConditionalRecurse = collections.namedtuple( 'ConditionalRecurse', ('key', 'schema', 'condition_key', 'condition_value', 'ensure_absent'), ) ConditionalRecurse.__new__.__defaults__ = (False,) ConditionalRecurse.check = _get_check_conditional(_check_required) ConditionalRecurse.check_fn = _check_fn_recurse ConditionalRecurse.apply_default = _apply_default_conditional_recurse ConditionalRecurse.remove_default = _remove_default_conditional_recurse NoAdditionalKeys = collections.namedtuple('NoAdditionalKeys', ('keys',)) NoAdditionalKeys.check = _no_additional_keys_check NoAdditionalKeys.apply_default = _dct_noop NoAdditionalKeys.remove_default = _dct_noop WarnAdditionalKeys = collections.namedtuple( 'WarnAdditionalKeys', ('keys', 'callback'), ) WarnAdditionalKeys.check = _warn_additional_keys_check WarnAdditionalKeys.apply_default = _dct_noop WarnAdditionalKeys.remove_default = _dct_noop class Map(collections.namedtuple('Map', ('object_name', 'id_key', 'items'))): __slots__ = () def __new__(cls, object_name, id_key, items): return super().__new__(cls, object_name, id_key, items) def check(self, v): if not isinstance(v, dict): raise ValidationError( f'Expected a {self.object_name} map but got a ' f'{type(v).__name__}', ) if self.id_key is None: context = f'At {self.object_name}()' else: key_v_s = v.get(self.id_key, MISSING) context = f'At {self.object_name}({self.id_key}={key_v_s!r})' with validate_context(context): for item in self.items: item.check(v) def apply_defaults(self, v): ret = v.copy() for item in self.items: item.apply_default(ret) return ret def remove_defaults(self, v): ret = v.copy() for item in self.items: item.remove_default(ret) return ret class Array(collections.namedtuple('Array', ('of', 'allow_empty'))): __slots__ = () def __new__(cls, of, allow_empty=True): return super().__new__(cls, of=of, allow_empty=allow_empty) def check(self, v): check_array(check_any)(v) if not self.allow_empty and not v: raise ValidationError( f"Expected at least 1 '{self.of.object_name}'", ) for val in v: validate(val, self.of) def apply_defaults(self, v): return [apply_defaults(val, self.of) for val in v] def remove_defaults(self, v): return [remove_defaults(val, self.of) for val in v] class Not(collections.namedtuple('Not', ('val',))): __slots__ = () def describe_opposite(self): return f'is {self.val!r}' def __eq__(self, other): return other is not MISSING and other != self.val class NotIn(collections.namedtuple('NotIn', ('values',))): __slots__ = () def __new__(cls, values): return super().__new__(cls, values=values) def describe_opposite(self): return f'is any of {self.values!r}' def __eq__(self, other): return other is not MISSING and other not in self.values class In(collections.namedtuple('In', ('values',))): __slots__ = () def __new__(cls, values): return super().__new__(cls, values=values) def describe_opposite(self): return f'is not any of {self.values!r}' def __eq__(self, other): return other is not MISSING and other in self.values def check_any(_): pass def check_type(tp, typename=None): def check_type_fn(v): if not isinstance(v, tp): typename_s = typename or tp.__name__ raise ValidationError( f'Expected {typename_s} got {type(v).__name__}', ) return check_type_fn check_bool = check_type(bool) check_bytes = check_type(bytes) check_int = check_type(int) check_string = check_type(str, typename='string') check_text = check_type(str, typename='text') def check_one_of(possible): def check_one_of_fn(v): if v not in possible: possible_s = ', '.join(str(x) for x in sorted(possible)) raise ValidationError( f'Expected one of {possible_s} but got: {v!r}', ) return check_one_of_fn def check_regex(v): try: re.compile(v) except re.error: raise ValidationError(f'{v!r} is not a valid python regex') def check_array(inner_check): def check_array_fn(v): if not isinstance(v, (list, tuple)): raise ValidationError( f'Expected array but got {type(v).__name__!r}', ) for i, val in enumerate(v): with validate_context(f'At index {i}'): inner_check(val) return check_array_fn def check_and(fns): def check(v): for fn in fns: fn(v) return check def validate(v, schema): schema.check(v) return v def apply_defaults(v, schema): return schema.apply_defaults(v) def remove_defaults(v, schema): return schema.remove_defaults(v) def load_from_filename( filename, schema, load_strategy, exc_tp=ValidationError, *, display_filename=None, ): display_filename = display_filename or filename with reraise_as(exc_tp): if not os.path.isfile(filename): raise ValidationError(f'{display_filename} is not a file') with validate_context(f'File {display_filename}'): try: with open(filename, encoding='utf-8') as f: contents = f.read() except UnicodeDecodeError as e: raise ValidationError(str(e)) try: data = load_strategy(contents) except Exception as e: raise ValidationError(str(e)) validate(data, schema) return apply_defaults(data, schema) Back

Edit File : cfgv.py | Size : 11.93 KB

from __future__ import annotations

import collections
import contextlib
import os.path
import re
import sys

class ValidationError(ValueError):
    def __init__(self, error_msg, ctx=None):
        super().__init__(error_msg)
        self.error_msg = error_msg
        self.ctx = ctx

def __str__(self):
        out = '\n'
        err = self
        while err.ctx is not None:
            out += f'==> {err.ctx}\n'
            err = err.error_msg
        out += f'=====> {err.error_msg}'
        return out

MISSING = collections.namedtuple('Missing', ())()
type(MISSING).__repr__ = lambda self: 'MISSING'

@contextlib.contextmanager
def validate_context(msg):
    try:
        yield
    except ValidationError as e:
        _, _, tb = sys.exc_info()
        raise ValidationError(e, ctx=msg).with_traceback(tb) from None

@contextlib.contextmanager
def reraise_as(tp):
    try:
        yield
    except ValidationError as e:
        _, _, tb = sys.exc_info()
        raise tp(e).with_traceback(tb) from None

def _dct_noop(self, dct):
    pass

def _check_optional(self, dct):
    if self.key not in dct:
        return
    with validate_context(f'At key: {self.key}'):
        self.check_fn(dct[self.key])

def _apply_default_optional(self, dct):
    dct.setdefault(self.key, self.default)

def _remove_default_optional(self, dct):
    if dct.get(self.key, MISSING) == self.default:
        del dct[self.key]

def _require_key(self, dct):
    if self.key not in dct:
        raise ValidationError(f'Missing required key: {self.key}')

def _check_required(self, dct):
    _require_key(self, dct)
    _check_optional(self, dct)

@property
def _check_fn_recurse(self):
    def check_fn(val):
        validate(val, self.schema)
    return check_fn

def _apply_default_required_recurse(self, dct):
    dct[self.key] = apply_defaults(dct[self.key], self.schema)

def _remove_default_required_recurse(self, dct):
    dct[self.key] = remove_defaults(dct[self.key], self.schema)

def _apply_default_optional_recurse(self, dct):
    if self.key not in dct:
        _apply_default_optional(self, dct)
    _apply_default_required_recurse(self, dct)

def _remove_default_optional_recurse(self, dct):
    if self.key in dct:
        _remove_default_required_recurse(self, dct)
        _remove_default_optional(self, dct)

def _get_check_conditional(inner):
    def _check_conditional(self, dct):
        if dct.get(self.condition_key, MISSING) == self.condition_value:
            inner(self, dct)
        elif (
                self.condition_key in dct and
                self.ensure_absent and self.key in dct
        ):
            if hasattr(self.condition_value, 'describe_opposite'):
                explanation = self.condition_value.describe_opposite()
            else:
                explanation = f'is not {self.condition_value!r}'
            raise ValidationError(
                f'Expected {self.key} to be absent when {self.condition_key} '
                f'{explanation}, found {self.key}: {dct[self.key]!r}',
            )
    return _check_conditional

def _apply_default_conditional_optional(self, dct):
    if dct.get(self.condition_key, MISSING) == self.condition_value:
        _apply_default_optional(self, dct)

def _remove_default_conditional_optional(self, dct):
    if dct.get(self.condition_key, MISSING) == self.condition_value:
        _remove_default_optional(self, dct)

def _apply_default_conditional_recurse(self, dct):
    if dct.get(self.condition_key, MISSING) == self.condition_value:
        _apply_default_required_recurse(self, dct)

def _remove_default_conditional_recurse(self, dct):
    if dct.get(self.condition_key, MISSING) == self.condition_value:
        _remove_default_required_recurse(self, dct)

def _no_additional_keys_check(self, dct):
    extra = sorted(set(dct) - set(self.keys))
    if extra:
        extra_s = ', '.join(str(x) for x in extra)
        keys_s = ', '.join(str(x) for x in self.keys)
        raise ValidationError(
            f'Additional keys found: {extra_s}.  '
            f'Only these keys are allowed: {keys_s}',
        )

def _warn_additional_keys_check(self, dct):
    extra = sorted(set(dct) - set(self.keys))
    if extra:
        self.callback(extra, self.keys, dct)

Required = collections.namedtuple('Required', ('key', 'check_fn'))
Required.check = _check_required
Required.apply_default = _dct_noop
Required.remove_default = _dct_noop
RequiredRecurse = collections.namedtuple('RequiredRecurse', ('key', 'schema'))
RequiredRecurse.check = _check_required
RequiredRecurse.check_fn = _check_fn_recurse
RequiredRecurse.apply_default = _apply_default_required_recurse
RequiredRecurse.remove_default = _remove_default_required_recurse
Optional = collections.namedtuple('Optional', ('key', 'check_fn', 'default'))
Optional.check = _check_optional
Optional.apply_default = _apply_default_optional
Optional.remove_default = _remove_default_optional
OptionalRecurse = collections.namedtuple(
    'OptionalRecurse', ('key', 'schema', 'default'),
)
OptionalRecurse.check = _check_optional
OptionalRecurse.check_fn = _check_fn_recurse
OptionalRecurse.apply_default = _apply_default_optional_recurse
OptionalRecurse.remove_default = _remove_default_optional_recurse
OptionalNoDefault = collections.namedtuple(
    'OptionalNoDefault', ('key', 'check_fn'),
)
OptionalNoDefault.check = _check_optional
OptionalNoDefault.apply_default = _dct_noop
OptionalNoDefault.remove_default = _dct_noop
Conditional = collections.namedtuple(
    'Conditional',
    ('key', 'check_fn', 'condition_key', 'condition_value', 'ensure_absent'),
)
Conditional.__new__.__defaults__ = (False,)
Conditional.check = _get_check_conditional(_check_required)
Conditional.apply_default = _dct_noop
Conditional.remove_default = _dct_noop
ConditionalOptional = collections.namedtuple(
    'ConditionalOptional',
    (
        'key', 'check_fn', 'default', 'condition_key', 'condition_value',
        'ensure_absent',
    ),
)
ConditionalOptional.__new__.__defaults__ = (False,)
ConditionalOptional.check = _get_check_conditional(_check_optional)
ConditionalOptional.apply_default = _apply_default_conditional_optional
ConditionalOptional.remove_default = _remove_default_conditional_optional
ConditionalRecurse = collections.namedtuple(
    'ConditionalRecurse',
    ('key', 'schema', 'condition_key', 'condition_value', 'ensure_absent'),
)
ConditionalRecurse.__new__.__defaults__ = (False,)
ConditionalRecurse.check = _get_check_conditional(_check_required)
ConditionalRecurse.check_fn = _check_fn_recurse
ConditionalRecurse.apply_default = _apply_default_conditional_recurse
ConditionalRecurse.remove_default = _remove_default_conditional_recurse
NoAdditionalKeys = collections.namedtuple('NoAdditionalKeys', ('keys',))
NoAdditionalKeys.check = _no_additional_keys_check
NoAdditionalKeys.apply_default = _dct_noop
NoAdditionalKeys.remove_default = _dct_noop
WarnAdditionalKeys = collections.namedtuple(
    'WarnAdditionalKeys', ('keys', 'callback'),
)
WarnAdditionalKeys.check = _warn_additional_keys_check
WarnAdditionalKeys.apply_default = _dct_noop
WarnAdditionalKeys.remove_default = _dct_noop

class Map(collections.namedtuple('Map', ('object_name', 'id_key', 'items'))):
    __slots__ = ()

def __new__(cls, object_name, id_key, *items):
        return super().__new__(cls, object_name, id_key, items)

def check(self, v):
        if not isinstance(v, dict):
            raise ValidationError(
                f'Expected a {self.object_name} map but got a '
                f'{type(v).__name__}',
            )
        if self.id_key is None:
            context = f'At {self.object_name}()'
        else:
            key_v_s = v.get(self.id_key, MISSING)
            context = f'At {self.object_name}({self.id_key}={key_v_s!r})'
        with validate_context(context):
            for item in self.items:
                item.check(v)

def apply_defaults(self, v):
        ret = v.copy()
        for item in self.items:
            item.apply_default(ret)
        return ret

def remove_defaults(self, v):
        ret = v.copy()
        for item in self.items:
            item.remove_default(ret)
        return ret

class Array(collections.namedtuple('Array', ('of', 'allow_empty'))):
    __slots__ = ()

def __new__(cls, of, allow_empty=True):
        return super().__new__(cls, of=of, allow_empty=allow_empty)

def check(self, v):
        check_array(check_any)(v)
        if not self.allow_empty and not v:
            raise ValidationError(
                f"Expected at least 1 '{self.of.object_name}'",
            )
        for val in v:
            validate(val, self.of)

def apply_defaults(self, v):
        return [apply_defaults(val, self.of) for val in v]

def remove_defaults(self, v):
        return [remove_defaults(val, self.of) for val in v]

class Not(collections.namedtuple('Not', ('val',))):
    __slots__ = ()

def describe_opposite(self):
        return f'is {self.val!r}'

def __eq__(self, other):
        return other is not MISSING and other != self.val

class NotIn(collections.namedtuple('NotIn', ('values',))):
    __slots__ = ()

def __new__(cls, *values):
        return super().__new__(cls, values=values)

def describe_opposite(self):
        return f'is any of {self.values!r}'

def __eq__(self, other):
        return other is not MISSING and other not in self.values

class In(collections.namedtuple('In', ('values',))):
    __slots__ = ()

def __new__(cls, *values):
        return super().__new__(cls, values=values)

def describe_opposite(self):
        return f'is not any of {self.values!r}'

def __eq__(self, other):
        return other is not MISSING and other in self.values

def check_any(_):
    pass

def check_type(tp, typename=None):
    def check_type_fn(v):
        if not isinstance(v, tp):
            typename_s = typename or tp.__name__
            raise ValidationError(
                f'Expected {typename_s} got {type(v).__name__}',
            )
    return check_type_fn

check_bool = check_type(bool)
check_bytes = check_type(bytes)
check_int = check_type(int)
check_string = check_type(str, typename='string')
check_text = check_type(str, typename='text')

def check_one_of(possible):
    def check_one_of_fn(v):
        if v not in possible:
            possible_s = ', '.join(str(x) for x in sorted(possible))
            raise ValidationError(
                f'Expected one of {possible_s} but got: {v!r}',
            )
    return check_one_of_fn

def check_regex(v):
    try:
        re.compile(v)
    except re.error:
        raise ValidationError(f'{v!r} is not a valid python regex')

def check_array(inner_check):
    def check_array_fn(v):
        if not isinstance(v, (list, tuple)):
            raise ValidationError(
                f'Expected array but got {type(v).__name__!r}',
            )

for i, val in enumerate(v):
            with validate_context(f'At index {i}'):
                inner_check(val)
    return check_array_fn

def check_and(*fns):
    def check(v):
        for fn in fns:
            fn(v)
    return check

def validate(v, schema):
    schema.check(v)
    return v

def apply_defaults(v, schema):
    return schema.apply_defaults(v)

def remove_defaults(v, schema):
    return schema.remove_defaults(v)

def load_from_filename(
        filename,
        schema,
        load_strategy,
        exc_tp=ValidationError,
        *,
        display_filename=None,
):
    display_filename = display_filename or filename
    with reraise_as(exc_tp):
        if not os.path.isfile(filename):
            raise ValidationError(f'{display_filename} is not a file')

with validate_context(f'File {display_filename}'):
            try:
                with open(filename, encoding='utf-8') as f:
                    contents = f.read()
            except UnicodeDecodeError as e:
                raise ValidationError(str(e))

try:
                data = load_strategy(contents)
            except Exception as e:
                raise ValidationError(str(e))

validate(data, schema)
            return apply_defaults(data, schema)

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