Пример #1
0
    def __call__(self, request):
        """
        Handles a call to this application. Returns 204 if the request is
        acceptable to the limiter, else a 403 is returned with a relevant
        header indicating when the request *will* succeed.
        """
        if request.method != "POST":
            raise webob.exc.HTTPMethodNotAllowed()

        try:
            info = dict(jsonutils.loads(request.body))
        except ValueError:
            raise webob.exc.HTTPBadRequest()

        username = request.path_info_pop()
        verb = info.get("verb")
        path = info.get("path")

        delay, error = self._limiter.check_for_delay(verb, path, username)

        if delay:
            headers = {"X-Wait-Seconds": "%.2f" % delay}
            return webob.exc.HTTPForbidden(headers=headers, explanation=error)
        else:
            return webob.exc.HTTPNoContent()
Пример #2
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    def __call__(self, request):
        """
        Handles a call to this application. Returns 204 if the request is
        acceptable to the limiter, else a 403 is returned with a relevant
        header indicating when the request *will* succeed.
        """
        if request.method != "POST":
            raise webob.exc.HTTPMethodNotAllowed()

        try:
            info = dict(jsonutils.loads(request.body))
        except ValueError:
            raise webob.exc.HTTPBadRequest()

        username = request.path_info_pop()
        verb = info.get("verb")
        path = info.get("path")

        delay, error = self._limiter.check_for_delay(verb, path, username)

        if delay:
            headers = {"X-Wait-Seconds": "%.2f" % delay}
            return webob.exc.HTTPForbidden(headers=headers, explanation=error)
        else:
            return webob.exc.HTTPNoContent()
Пример #3
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def action_peek_json(body):
    """Determine action to invoke."""

    try:
        decoded = jsonutils.loads(body)
    except ValueError:
        msg = _("cannot understand JSON")
        raise exception.MalformedRequestBody(reason=msg)

    # Make sure there's exactly one key...
    if len(decoded) != 1:
        msg = _("too many body keys")
        raise exception.MalformedRequestBody(reason=msg)

    # Return the action and the decoded body...
    return decoded.keys()[0]
Пример #4
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def deserialize_msg(msg):
    # NOTE(russellb): Hang on to your hats, this road is about to
    # get a little bumpy.
    #
    # Robustness Principle:
    #    "Be strict in what you send, liberal in what you accept."
    #
    # At this point we have to do a bit of guessing about what it
    # is we just received.  Here is the set of possibilities:
    #
    # 1) We received a dict.  This could be 2 things:
    #
    #   a) Inspect it to see if it looks like a standard message envelope.
    #      If so, great!
    #
    #   b) If it doesn't look like a standard message envelope, it could either
    #      be a notification, or a message from before we added a message
    #      envelope (referred to as version 1.0).
    #      Just return the message as-is.
    #
    # 2) It's any other non-dict type.  Just return it and hope for the best.
    #    This case covers return values from rpc.call() from before message
    #    envelopes were used.  (messages to call a method were always a dict)

    if not isinstance(msg, dict):
        # See #2 above.
        return msg

    base_envelope_keys = (_VERSION_KEY, _MESSAGE_KEY)
    if not all(map(lambda key: key in msg, base_envelope_keys)):
        #  See #1.b above.
        return msg

    # At this point we think we have the message envelope
    # format we were expecting. (#1.a above)

    if not version_is_compatible(_RPC_ENVELOPE_VERSION, msg[_VERSION_KEY]):
        raise UnsupportedRpcEnvelopeVersion(version=msg[_VERSION_KEY])

    raw_msg = jsonutils.loads(msg[_MESSAGE_KEY])

    return raw_msg
Пример #5
0
def deserialize_msg(msg):
    # NOTE(russellb): Hang on to your hats, this road is about to
    # get a little bumpy.
    #
    # Robustness Principle:
    #    "Be strict in what you send, liberal in what you accept."
    #
    # At this point we have to do a bit of guessing about what it
    # is we just received.  Here is the set of possibilities:
    #
    # 1) We received a dict.  This could be 2 things:
    #
    #   a) Inspect it to see if it looks like a standard message envelope.
    #      If so, great!
    #
    #   b) If it doesn't look like a standard message envelope, it could either
    #      be a notification, or a message from before we added a message
    #      envelope (referred to as version 1.0).
    #      Just return the message as-is.
    #
    # 2) It's any other non-dict type.  Just return it and hope for the best.
    #    This case covers return values from rpc.call() from before message
    #    envelopes were used.  (messages to call a method were always a dict)

    if not isinstance(msg, dict):
        # See #2 above.
        return msg

    base_envelope_keys = (_VERSION_KEY, _MESSAGE_KEY)
    if not all(map(lambda key: key in msg, base_envelope_keys)):
        #  See #1.b above.
        return msg

    # At this point we think we have the message envelope
    # format we were expecting. (#1.a above)

    if not version_is_compatible(_RPC_ENVELOPE_VERSION, msg[_VERSION_KEY]):
        raise UnsupportedRpcEnvelopeVersion(version=msg[_VERSION_KEY])

    raw_msg = jsonutils.loads(msg[_MESSAGE_KEY])

    return raw_msg
Пример #6
0
def deserialize_remote_exception(conf, data):
    failure = jsonutils.loads(str(data))

    trace = failure.get('tb', [])
    message = failure.get('message', "") + "\n" + "\n".join(trace)
    name = failure.get('class')
    module = failure.get('module')

    # NOTE(ameade): We DO NOT want to allow just any module to be imported, in
    # order to prevent arbitrary code execution.
    if module not in conf.allowed_rpc_exception_modules:
        return RemoteError(name, failure.get('message'), trace)

    try:
        mod = importutils.import_module(module)
        klass = getattr(mod, name)
        if not issubclass(klass, Exception):
            raise TypeError("Can only deserialize Exceptions")

        failure = klass(**failure.get('kwargs', {}))
    except (AttributeError, TypeError, ImportError):
        return RemoteError(name, failure.get('message'), trace)

    ex_type = type(failure)
    str_override = lambda self: message
    new_ex_type = type(ex_type.__name__ + "_Remote", (ex_type, ), {
        '__str__': str_override,
        '__unicode__': str_override
    })
    try:
        # NOTE(ameade): Dynamically create a new exception type and swap it in
        # as the new type for the exception. This only works on user defined
        # Exceptions and not core python exceptions. This is important because
        # we cannot necessarily change an exception message so we must override
        # the __str__ method.
        failure.__class__ = new_ex_type
    except TypeError:
        # NOTE(ameade): If a core exception then just add the traceback to the
        # first exception argument.
        failure.args = (message, ) + failure.args[1:]
    return failure
Пример #7
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def deserialize_remote_exception(conf, data):
    failure = jsonutils.loads(str(data))

    trace = failure.get('tb', [])
    message = failure.get('message', "") + "\n" + "\n".join(trace)
    name = failure.get('class')
    module = failure.get('module')

    # NOTE(ameade): We DO NOT want to allow just any module to be imported, in
    # order to prevent arbitrary code execution.
    if module not in conf.allowed_rpc_exception_modules:
        return RemoteError(name, failure.get('message'), trace)

    try:
        mod = importutils.import_module(module)
        klass = getattr(mod, name)
        if not issubclass(klass, Exception):
            raise TypeError("Can only deserialize Exceptions")

        failure = klass(**failure.get('kwargs', {}))
    except (AttributeError, TypeError, ImportError):
        return RemoteError(name, failure.get('message'), trace)

    ex_type = type(failure)
    str_override = lambda self: message
    new_ex_type = type(ex_type.__name__ + "_Remote", (ex_type,),
                       {'__str__': str_override, '__unicode__': str_override})
    try:
        # NOTE(ameade): Dynamically create a new exception type and swap it in
        # as the new type for the exception. This only works on user defined
        # Exceptions and not core python exceptions. This is important because
        # we cannot necessarily change an exception message so we must override
        # the __str__ method.
        failure.__class__ = new_ex_type
    except TypeError:
        # NOTE(ameade): If a core exception then just add the traceback to the
        # first exception argument.
        failure.args = (message,) + failure.args[1:]
    return failure
Пример #8
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    def host_passes(self, host_state, filter_properties):
        """Return a list of hosts that can fulfill the requirements
        specified in the query.
        """
        # TODO(zhiteng) Add description for filter_properties structure
        # and scheduler_hints.
        try:
            query = filter_properties['scheduler_hints']['query']
        except KeyError:
            query = None
        if not query:
            return True

        # NOTE(comstud): Not checking capabilities or service for
        # enabled/disabled so that a provided json filter can decide

        result = self._process_filter(jsonutils.loads(query), host_state)
        if isinstance(result, list):
            # If any succeeded, include the host
            result = any(result)
        if result:
            # Filter it out.
            return True
        return False
Пример #9
0
    def host_passes(self, host_state, filter_properties):
        """Return a list of hosts that can fulfill the requirements
        specified in the query.
        """
        # TODO(zhiteng) Add description for filter_properties structure
        # and scheduler_hints.
        try:
            query = filter_properties['scheduler_hints']['query']
        except KeyError:
            query = None
        if not query:
            return True

        # NOTE(comstud): Not checking capabilities or service for
        # enabled/disabled so that a provided json filter can decide

        result = self._process_filter(jsonutils.loads(query), host_state)
        if isinstance(result, list):
            # If any succeeded, include the host
            result = any(result)
        if result:
            # Filter it out.
            return True
        return False
Пример #10
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def _json_loads(properties, attr):
    prop = properties[attr]
    if isinstance(prop, basestring):
        properties[attr] = jsonutils.loads(prop)
Пример #11
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 def load_json(cls, data, default_rule=None):
     """Init a brain using json instead of a rules dictionary."""
     rules_dict = jsonutils.loads(data)
     return cls(rules=rules_dict, default_rule=default_rule)
Пример #12
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def _deserialize(data):
    """
    Deserialization wrapper
    """
    LOG.debug(_("Deserializing: %s"), data)
    return jsonutils.loads(data)
Пример #13
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def _deserialize(data):
    """
    Deserialization wrapper
    """
    LOG.debug(_("Deserializing: %s"), data)
    return jsonutils.loads(data)
Пример #14
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 def _from_json(self, datastring):
     try:
         return jsonutils.loads(datastring)
     except ValueError:
         msg = _("cannot understand JSON")
         raise exception.MalformedRequestBody(reason=msg)