Python django.utils.lru_cache.lru_cache() Examples

The following are 11 code examples for showing how to use django.utils.lru_cache.lru_cache(). These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.

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Example 1
Project: GTDWeb   Author: lanbing510   File: trans_real.py    License: GNU General Public License v2.0 6 votes vote down vote up
def check_for_language(lang_code):
    """
    Checks whether there is a global language file for the given language
    code. This is used to decide whether a user-provided language is
    available.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    # First, a quick check to make sure lang_code is well-formed (#21458)
    if lang_code is None or not language_code_re.search(lang_code):
        return False
    for path in all_locale_paths():
        if gettext_module.find('django', path, [to_locale(lang_code)]) is not None:
            return True
    return False 
Example 2
Project: python   Author: Yeah-Kun   File: trans_real.py    License: Apache License 2.0 6 votes vote down vote up
def check_for_language(lang_code):
    """
    Checks whether there is a global language file for the given language
    code. This is used to decide whether a user-provided language is
    available.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    # First, a quick check to make sure lang_code is well-formed (#21458)
    if lang_code is None or not language_code_re.search(lang_code):
        return False
    for path in all_locale_paths():
        if gettext_module.find('django', path, [to_locale(lang_code)]) is not None:
            return True
    return False 
Example 3
Project: openhgsenti   Author: drexly   File: trans_real.py    License: Apache License 2.0 6 votes vote down vote up
def check_for_language(lang_code):
    """
    Checks whether there is a global language file for the given language
    code. This is used to decide whether a user-provided language is
    available.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    # First, a quick check to make sure lang_code is well-formed (#21458)
    if lang_code is None or not language_code_re.search(lang_code):
        return False
    for path in all_locale_paths():
        if gettext_module.find('django', path, [to_locale(lang_code)]) is not None:
            return True
    return False 
Example 4
Project: python2017   Author: bpgc-cte   File: trans_real.py    License: MIT License 6 votes vote down vote up
def check_for_language(lang_code):
    """
    Checks whether there is a global language file for the given language
    code. This is used to decide whether a user-provided language is
    available.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    # First, a quick check to make sure lang_code is well-formed (#21458)
    if lang_code is None or not language_code_re.search(lang_code):
        return False
    for path in all_locale_paths():
        if gettext_module.find('django', path, [to_locale(lang_code)]) is not None:
            return True
    return False 
Example 5
Project: jarvis   Author: haynieresearch   File: utils.py    License: GNU General Public License v2.0 6 votes vote down vote up
def reset_hashers(self):
        """
        Wrapper to manually reset django's hasher lookup cache
        """
        # resets cache for .get_hashers() & .get_hashers_by_algorithm()
        from django.contrib.auth.hashers import reset_hashers
        reset_hashers(setting="PASSWORD_HASHERS")

        # reset internal caches
        super(DjangoContextAdapter, self).reset_hashers()

    #=============================================================================
    # django hashers helpers -- hasher lookup
    #=============================================================================

    # lru_cache()'ed by init 
Example 6
Project: GTDWeb   Author: lanbing510   File: trans_real.py    License: GNU General Public License v2.0 5 votes vote down vote up
def get_supported_language_variant(lang_code, strict=False):
    """
    Returns the language-code that's listed in supported languages, possibly
    selecting a more generic variant. Raises LookupError if nothing found.

    If `strict` is False (the default), the function will look for an alternative
    country-specific variant when the currently checked is not found.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    if lang_code:
        # If 'fr-ca' is not supported, try special fallback or language-only 'fr'.
        possible_lang_codes = [lang_code]
        try:
            possible_lang_codes.extend(LANG_INFO[lang_code]['fallback'])
        except KeyError:
            pass
        generic_lang_code = lang_code.split('-')[0]
        possible_lang_codes.append(generic_lang_code)
        supported_lang_codes = get_languages()

        for code in possible_lang_codes:
            if code in supported_lang_codes and check_for_language(code):
                return code
        if not strict:
            # if fr-fr is not supported, try fr-ca.
            for supported_code in supported_lang_codes:
                if supported_code.startswith(generic_lang_code + '-'):
                    return supported_code
    raise LookupError(lang_code) 
Example 7
Project: python   Author: Yeah-Kun   File: trans_real.py    License: Apache License 2.0 5 votes vote down vote up
def get_supported_language_variant(lang_code, strict=False):
    """
    Returns the language-code that's listed in supported languages, possibly
    selecting a more generic variant. Raises LookupError if nothing found.

    If `strict` is False (the default), the function will look for an alternative
    country-specific variant when the currently checked is not found.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    if lang_code:
        # If 'fr-ca' is not supported, try special fallback or language-only 'fr'.
        possible_lang_codes = [lang_code]
        try:
            possible_lang_codes.extend(LANG_INFO[lang_code]['fallback'])
        except KeyError:
            pass
        generic_lang_code = lang_code.split('-')[0]
        possible_lang_codes.append(generic_lang_code)
        supported_lang_codes = get_languages()

        for code in possible_lang_codes:
            if code in supported_lang_codes and check_for_language(code):
                return code
        if not strict:
            # if fr-fr is not supported, try fr-ca.
            for supported_code in supported_lang_codes:
                if supported_code.startswith(generic_lang_code + '-'):
                    return supported_code
    raise LookupError(lang_code) 
Example 8
Project: openhgsenti   Author: drexly   File: trans_real.py    License: Apache License 2.0 5 votes vote down vote up
def get_supported_language_variant(lang_code, strict=False):
    """
    Returns the language-code that's listed in supported languages, possibly
    selecting a more generic variant. Raises LookupError if nothing found.

    If `strict` is False (the default), the function will look for an alternative
    country-specific variant when the currently checked is not found.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    if lang_code:
        # If 'fr-ca' is not supported, try special fallback or language-only 'fr'.
        possible_lang_codes = [lang_code]
        try:
            possible_lang_codes.extend(LANG_INFO[lang_code]['fallback'])
        except KeyError:
            pass
        generic_lang_code = lang_code.split('-')[0]
        possible_lang_codes.append(generic_lang_code)
        supported_lang_codes = get_languages()

        for code in possible_lang_codes:
            if code in supported_lang_codes and check_for_language(code):
                return code
        if not strict:
            # if fr-fr is not supported, try fr-ca.
            for supported_code in supported_lang_codes:
                if supported_code.startswith(generic_lang_code + '-'):
                    return supported_code
    raise LookupError(lang_code) 
Example 9
Project: python2017   Author: bpgc-cte   File: trans_real.py    License: MIT License 5 votes vote down vote up
def get_supported_language_variant(lang_code, strict=False):
    """
    Returns the language-code that's listed in supported languages, possibly
    selecting a more generic variant. Raises LookupError if nothing found.

    If `strict` is False (the default), the function will look for an alternative
    country-specific variant when the currently checked is not found.

    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
    as the provided language codes are taken from the HTTP request. See also
    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
    """
    if lang_code:
        # If 'fr-ca' is not supported, try special fallback or language-only 'fr'.
        possible_lang_codes = [lang_code]
        try:
            possible_lang_codes.extend(LANG_INFO[lang_code]['fallback'])
        except KeyError:
            pass
        generic_lang_code = lang_code.split('-')[0]
        possible_lang_codes.append(generic_lang_code)
        supported_lang_codes = get_languages()

        for code in possible_lang_codes:
            if code in supported_lang_codes and check_for_language(code):
                return code
        if not strict:
            # if fr-fr is not supported, try fr-ca.
            for supported_code in supported_lang_codes:
                if supported_code.startswith(generic_lang_code + '-'):
                    return supported_code
    raise LookupError(lang_code) 
Example 10
Project: jarvis   Author: haynieresearch   File: utils.py    License: GNU General Public License v2.0 5 votes vote down vote up
def __init__(self, context=None, get_user_category=None, **kwds):

        # init log
        self.log = logging.getLogger(__name__ + ".DjangoContextAdapter")

        # init parent, filling in default context object
        if context is None:
            context = CryptContext()
        super(DjangoContextAdapter, self).__init__(context=context, **kwds)

        # setup user category
        if get_user_category:
            assert callable(get_user_category)
            self.get_user_category = get_user_category

        # install lru cache wrappers
        from django.utils.lru_cache import lru_cache
        self.get_hashers = lru_cache()(self.get_hashers)

        # get copy of original make_password
        from django.contrib.auth.hashers import make_password
        if make_password.__module__.startswith("passlib."):
            make_password = _PatchManager.peek_unpatched_func(make_password)
        self._orig_make_password = make_password

        # get other django helpers
        from django.contrib.auth.hashers import is_password_usable
        self.is_password_usable = is_password_usable

        # init manager
        mlog = logging.getLogger(__name__ + ".DjangoContextAdapter._manager")
        self._manager = _PatchManager(log=mlog) 
Example 11
Project: zulip   Author: zulip   File: cache.py    License: Apache License 2.0 4 votes vote down vote up
def ignore_unhashable_lru_cache(maxsize: int=128, typed: bool=False) -> DECORATOR:
    """
    This is a wrapper over lru_cache function. It adds following features on
    top of lru_cache:

        * It will not cache result of functions with unhashable arguments.
        * It will clear cache whenever zerver.lib.cache.KEY_PREFIX changes.
    """
    internal_decorator = lru_cache(maxsize=maxsize, typed=typed)

    def decorator(user_function: Callable[..., Any]) -> Callable[..., Any]:
        if settings.DEVELOPMENT and not settings.TEST_SUITE:  # nocoverage
            # In the development environment, we want every file
            # change to refresh the source files from disk.
            return user_function
        cache_enabled_user_function = internal_decorator(user_function)

        def wrapper(*args: Any, **kwargs: Any) -> Any:
            if not hasattr(cache_enabled_user_function, 'key_prefix'):
                cache_enabled_user_function.key_prefix = KEY_PREFIX

            if cache_enabled_user_function.key_prefix != KEY_PREFIX:
                # Clear cache when cache.KEY_PREFIX changes. This is used in
                # tests.
                cache_enabled_user_function.cache_clear()
                cache_enabled_user_function.key_prefix = KEY_PREFIX

            try:
                return cache_enabled_user_function(*args, **kwargs)
            except TypeError:
                # args or kwargs contains an element which is unhashable. In
                # this case we don't cache the result.
                pass

            # Deliberately calling this function from outside of exception
            # handler to get a more descriptive traceback. Otherwise traceback
            # can include the exception from cached_enabled_user_function as
            # well.
            return user_function(*args, **kwargs)

        setattr(wrapper, 'cache_info', cache_enabled_user_function.cache_info)
        setattr(wrapper, 'cache_clear', cache_enabled_user_function.cache_clear)
        return wrapper

    return decorator