mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-27 03:19:24 -05:00
b970cb0e96
* Correctly retry and back off if we get a HTTPerror response * Refactor request sending to have better excpetions MatrixFederationHttpClient blindly reraised exceptions to the caller without differentiating "expected" failures (e.g. connection timeouts etc) versus more severe problems (e.g. programming errors). This commit adds a RequestSendFailed exception that is raised when "expected" failures happen, allowing the TransactionQueue to log them as warnings while allowing us to log other exceptions as actual exceptions.
469 lines
15 KiB
Python
469 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains exceptions and error codes."""
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import logging
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from six import iteritems
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from six.moves import http_client
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from canonicaljson import json
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logger = logging.getLogger(__name__)
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class Codes(object):
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UNRECOGNIZED = "M_UNRECOGNIZED"
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UNAUTHORIZED = "M_UNAUTHORIZED"
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FORBIDDEN = "M_FORBIDDEN"
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BAD_JSON = "M_BAD_JSON"
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NOT_JSON = "M_NOT_JSON"
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USER_IN_USE = "M_USER_IN_USE"
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ROOM_IN_USE = "M_ROOM_IN_USE"
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BAD_PAGINATION = "M_BAD_PAGINATION"
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BAD_STATE = "M_BAD_STATE"
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UNKNOWN = "M_UNKNOWN"
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NOT_FOUND = "M_NOT_FOUND"
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MISSING_TOKEN = "M_MISSING_TOKEN"
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UNKNOWN_TOKEN = "M_UNKNOWN_TOKEN"
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GUEST_ACCESS_FORBIDDEN = "M_GUEST_ACCESS_FORBIDDEN"
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LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
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CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
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CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
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MISSING_PARAM = "M_MISSING_PARAM"
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INVALID_PARAM = "M_INVALID_PARAM"
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TOO_LARGE = "M_TOO_LARGE"
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EXCLUSIVE = "M_EXCLUSIVE"
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THREEPID_AUTH_FAILED = "M_THREEPID_AUTH_FAILED"
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THREEPID_IN_USE = "M_THREEPID_IN_USE"
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THREEPID_NOT_FOUND = "M_THREEPID_NOT_FOUND"
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THREEPID_DENIED = "M_THREEPID_DENIED"
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INVALID_USERNAME = "M_INVALID_USERNAME"
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SERVER_NOT_TRUSTED = "M_SERVER_NOT_TRUSTED"
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CONSENT_NOT_GIVEN = "M_CONSENT_NOT_GIVEN"
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CANNOT_LEAVE_SERVER_NOTICE_ROOM = "M_CANNOT_LEAVE_SERVER_NOTICE_ROOM"
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RESOURCE_LIMIT_EXCEEDED = "M_RESOURCE_LIMIT_EXCEEDED"
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UNSUPPORTED_ROOM_VERSION = "M_UNSUPPORTED_ROOM_VERSION"
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INCOMPATIBLE_ROOM_VERSION = "M_INCOMPATIBLE_ROOM_VERSION"
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WRONG_ROOM_KEYS_VERSION = "M_WRONG_ROOM_KEYS_VERSION"
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class CodeMessageException(RuntimeError):
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"""An exception with integer code and message string attributes.
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Attributes:
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code (int): HTTP error code
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msg (str): string describing the error
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"""
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def __init__(self, code, msg):
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super(CodeMessageException, self).__init__("%d: %s" % (code, msg))
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self.code = code
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self.msg = msg
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class SynapseError(CodeMessageException):
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"""A base exception type for matrix errors which have an errcode and error
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message (as well as an HTTP status code).
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Attributes:
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errcode (str): Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(self, code, msg, errcode=Codes.UNKNOWN):
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"""Constructs a synapse error.
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Args:
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code (int): The integer error code (an HTTP response code)
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msg (str): The human-readable error message.
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errcode (str): The matrix error code e.g 'M_FORBIDDEN'
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"""
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super(SynapseError, self).__init__(code, msg)
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self.errcode = errcode
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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)
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class ProxiedRequestError(SynapseError):
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"""An error from a general matrix endpoint, eg. from a proxied Matrix API call.
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Attributes:
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errcode (str): Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(self, code, msg, errcode=Codes.UNKNOWN, additional_fields=None):
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super(ProxiedRequestError, self).__init__(
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code, msg, errcode
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)
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if additional_fields is None:
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self._additional_fields = {}
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else:
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self._additional_fields = dict(additional_fields)
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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**self._additional_fields
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)
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class ConsentNotGivenError(SynapseError):
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"""The error returned to the client when the user has not consented to the
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privacy policy.
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"""
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def __init__(self, msg, consent_uri):
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"""Constructs a ConsentNotGivenError
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Args:
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msg (str): The human-readable error message
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consent_url (str): The URL where the user can give their consent
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"""
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super(ConsentNotGivenError, self).__init__(
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code=http_client.FORBIDDEN,
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msg=msg,
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errcode=Codes.CONSENT_NOT_GIVEN
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)
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self._consent_uri = consent_uri
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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consent_uri=self._consent_uri
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)
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class RegistrationError(SynapseError):
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"""An error raised when a registration event fails."""
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pass
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class FederationDeniedError(SynapseError):
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"""An error raised when the server tries to federate with a server which
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is not on its federation whitelist.
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Attributes:
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destination (str): The destination which has been denied
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"""
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def __init__(self, destination):
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"""Raised by federation client or server to indicate that we are
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are deliberately not attempting to contact a given server because it is
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not on our federation whitelist.
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Args:
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destination (str): the domain in question
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"""
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self.destination = destination
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super(FederationDeniedError, self).__init__(
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code=403,
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msg="Federation denied with %s." % (self.destination,),
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errcode=Codes.FORBIDDEN,
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)
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class InteractiveAuthIncompleteError(Exception):
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"""An error raised when UI auth is not yet complete
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(This indicates we should return a 401 with 'result' as the body)
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Attributes:
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result (dict): the server response to the request, which should be
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passed back to the client
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"""
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def __init__(self, result):
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super(InteractiveAuthIncompleteError, self).__init__(
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"Interactive auth not yet complete",
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)
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self.result = result
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class UnrecognizedRequestError(SynapseError):
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"""An error indicating we don't understand the request you're trying to make"""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.UNRECOGNIZED
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message = None
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if len(args) == 0:
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message = "Unrecognized request"
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else:
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message = args[0]
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super(UnrecognizedRequestError, self).__init__(
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400,
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message,
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**kwargs
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)
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class NotFoundError(SynapseError):
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"""An error indicating we can't find the thing you asked for"""
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def __init__(self, msg="Not found", errcode=Codes.NOT_FOUND):
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super(NotFoundError, self).__init__(
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404,
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msg,
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errcode=errcode
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)
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class AuthError(SynapseError):
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"""An error raised when there was a problem authorising an event."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.FORBIDDEN
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super(AuthError, self).__init__(*args, **kwargs)
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class ResourceLimitError(SynapseError):
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"""
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Any error raised when there is a problem with resource usage.
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For instance, the monthly active user limit for the server has been exceeded
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"""
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def __init__(
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self, code, msg,
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errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
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admin_contact=None,
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limit_type=None,
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):
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self.admin_contact = admin_contact
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self.limit_type = limit_type
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super(ResourceLimitError, self).__init__(code, msg, errcode=errcode)
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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admin_contact=self.admin_contact,
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limit_type=self.limit_type
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)
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class EventSizeError(SynapseError):
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"""An error raised when an event is too big."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.TOO_LARGE
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super(EventSizeError, self).__init__(413, *args, **kwargs)
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class EventStreamError(SynapseError):
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"""An error raised when there a problem with the event stream."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.BAD_PAGINATION
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super(EventStreamError, self).__init__(*args, **kwargs)
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class LoginError(SynapseError):
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"""An error raised when there was a problem logging in."""
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pass
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class StoreError(SynapseError):
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"""An error raised when there was a problem storing some data."""
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pass
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class InvalidCaptchaError(SynapseError):
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def __init__(self, code=400, msg="Invalid captcha.", error_url=None,
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errcode=Codes.CAPTCHA_INVALID):
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super(InvalidCaptchaError, self).__init__(code, msg, errcode)
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self.error_url = error_url
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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error_url=self.error_url,
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)
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class LimitExceededError(SynapseError):
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"""A client has sent too many requests and is being throttled.
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"""
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def __init__(self, code=429, msg="Too Many Requests", retry_after_ms=None,
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errcode=Codes.LIMIT_EXCEEDED):
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super(LimitExceededError, self).__init__(code, msg, errcode)
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self.retry_after_ms = retry_after_ms
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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retry_after_ms=self.retry_after_ms,
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)
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class RoomKeysVersionError(SynapseError):
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"""A client has tried to upload to a non-current version of the room_keys store
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"""
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def __init__(self, current_version):
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"""
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Args:
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current_version (str): the current version of the store they should have used
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"""
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super(RoomKeysVersionError, self).__init__(
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403, "Wrong room_keys version", Codes.WRONG_ROOM_KEYS_VERSION
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)
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self.current_version = current_version
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class IncompatibleRoomVersionError(SynapseError):
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"""A server is trying to join a room whose version it does not support."""
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def __init__(self, room_version):
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super(IncompatibleRoomVersionError, self).__init__(
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code=400,
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msg="Your homeserver does not support the features required to "
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"join this room",
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errcode=Codes.INCOMPATIBLE_ROOM_VERSION,
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)
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self._room_version = room_version
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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room_version=self._room_version,
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)
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class RequestSendFailed(RuntimeError):
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"""Sending a HTTP request over federation failed due to not being able to
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talk to the remote server for some reason.
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This exception is used to differentiate "expected" errors that arise due to
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networking (e.g. DNS failures, connection timeouts etc), versus unexpected
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errors (like programming errors).
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"""
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def __init__(self, inner_exception, can_retry):
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super(RequestSendFailed, self).__init__(
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"Failed to send request: %s: %s" % (
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type(inner_exception).__name__, inner_exception,
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)
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)
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self.inner_exception = inner_exception
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self.can_retry = can_retry
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def cs_error(msg, code=Codes.UNKNOWN, **kwargs):
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""" Utility method for constructing an error response for client-server
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interactions.
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Args:
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msg (str): The error message.
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code (str): The error code.
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kwargs : Additional keys to add to the response.
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Returns:
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A dict representing the error response JSON.
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"""
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err = {"error": msg, "errcode": code}
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for key, value in iteritems(kwargs):
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err[key] = value
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return err
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class FederationError(RuntimeError):
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""" This class is used to inform remote home servers about erroneous
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PDUs they sent us.
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FATAL: The remote server could not interpret the source event.
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(e.g., it was missing a required field)
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ERROR: The remote server interpreted the event, but it failed some other
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check (e.g. auth)
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WARN: The remote server accepted the event, but believes some part of it
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is wrong (e.g., it referred to an invalid event)
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"""
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def __init__(self, level, code, reason, affected, source=None):
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if level not in ["FATAL", "ERROR", "WARN"]:
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raise ValueError("Level is not valid: %s" % (level,))
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self.level = level
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self.code = code
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self.reason = reason
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self.affected = affected
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self.source = source
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msg = "%s %s: %s" % (level, code, reason,)
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super(FederationError, self).__init__(msg)
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def get_dict(self):
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return {
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"level": self.level,
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"code": self.code,
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"reason": self.reason,
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"affected": self.affected,
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"source": self.source if self.source else self.affected,
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}
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class HttpResponseException(CodeMessageException):
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"""
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Represents an HTTP-level failure of an outbound request
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Attributes:
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response (bytes): body of response
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"""
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def __init__(self, code, msg, response):
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"""
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Args:
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code (int): HTTP status code
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msg (str): reason phrase from HTTP response status line
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response (bytes): body of response
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"""
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super(HttpResponseException, self).__init__(code, msg)
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self.response = response
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def to_synapse_error(self):
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"""Make a SynapseError based on an HTTPResponseException
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This is useful when a proxied request has failed, and we need to
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decide how to map the failure onto a matrix error to send back to the
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client.
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An attempt is made to parse the body of the http response as a matrix
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error. If that succeeds, the errcode and error message from the body
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are used as the errcode and error message in the new synapse error.
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Otherwise, the errcode is set to M_UNKNOWN, and the error message is
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set to the reason code from the HTTP response.
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Returns:
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SynapseError:
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"""
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# try to parse the body as json, to get better errcode/msg, but
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# default to M_UNKNOWN with the HTTP status as the error text
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try:
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j = json.loads(self.response)
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except ValueError:
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j = {}
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if not isinstance(j, dict):
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j = {}
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errcode = j.pop('errcode', Codes.UNKNOWN)
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errmsg = j.pop('error', self.msg)
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return ProxiedRequestError(self.code, errmsg, errcode, j)
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