1548 lines
56 KiB
Python
1548 lines
56 KiB
Python
# Copyright 2014-2021 The Matrix.org Foundation C.I.C.
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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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import abc
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import cgi
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import codecs
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import logging
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import random
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import sys
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import urllib.parse
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from http import HTTPStatus
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from io import BytesIO, StringIO
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from typing import (
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TYPE_CHECKING,
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Any,
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BinaryIO,
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Callable,
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Dict,
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Generic,
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List,
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Optional,
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TextIO,
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Tuple,
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TypeVar,
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Union,
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cast,
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overload,
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)
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import attr
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import treq
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from canonicaljson import encode_canonical_json
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from prometheus_client import Counter
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from signedjson.sign import sign_json
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from typing_extensions import Literal
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from twisted.internet import defer
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from twisted.internet.error import DNSLookupError
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from twisted.internet.interfaces import IReactorTime
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from twisted.internet.task import Cooperator
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from twisted.web.client import ResponseFailed
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from twisted.web.http_headers import Headers
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from twisted.web.iweb import IAgent, IBodyProducer, IResponse
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import synapse.metrics
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import synapse.util.retryutils
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from synapse.api.errors import (
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Codes,
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FederationDeniedError,
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HttpResponseException,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.crypto.context_factory import FederationPolicyForHTTPS
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from synapse.http import QuieterFileBodyProducer
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from synapse.http.client import (
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BlocklistingAgentWrapper,
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BodyExceededMaxSize,
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ByteWriteable,
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_make_scheduler,
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encode_query_args,
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read_body_with_max_size,
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)
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from synapse.http.connectproxyclient import BearerProxyCredentials
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from synapse.http.federation.matrix_federation_agent import MatrixFederationAgent
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from synapse.http.proxyagent import ProxyAgent
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from synapse.http.types import QueryParams
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from synapse.logging import opentracing
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from synapse.logging.context import make_deferred_yieldable, run_in_background
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from synapse.logging.opentracing import set_tag, start_active_span, tags
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from synapse.types import JsonDict
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from synapse.util import json_decoder
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from synapse.util.async_helpers import AwakenableSleeper, timeout_deferred
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from synapse.util.metrics import Measure
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from synapse.util.stringutils import parse_and_validate_server_name
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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outgoing_requests_counter = Counter(
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"synapse_http_matrixfederationclient_requests", "", ["method"]
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)
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incoming_responses_counter = Counter(
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"synapse_http_matrixfederationclient_responses", "", ["method", "code"]
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)
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MAXINT = sys.maxsize
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_next_id = 1
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T = TypeVar("T")
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class ByteParser(ByteWriteable, Generic[T], abc.ABC):
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"""A `ByteWriteable` that has an additional `finish` function that returns
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the parsed data.
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"""
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CONTENT_TYPE: str = abc.abstractproperty() # type: ignore
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"""The expected content type of the response, e.g. `application/json`. If
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the content type doesn't match we fail the request.
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"""
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# a federation response can be rather large (eg a big state_ids is 50M or so), so we
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# need a generous limit here.
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MAX_RESPONSE_SIZE: int = 100 * 1024 * 1024
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"""The largest response this parser will accept."""
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@abc.abstractmethod
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def finish(self) -> T:
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"""Called when response has finished streaming and the parser should
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return the final result (or error).
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"""
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class MatrixFederationRequest:
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method: str
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"""HTTP method
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"""
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path: str
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"""HTTP path
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"""
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destination: str
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"""The remote server to send the HTTP request to.
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"""
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json: Optional[JsonDict] = None
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"""JSON to send in the body.
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"""
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json_callback: Optional[Callable[[], JsonDict]] = None
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"""A callback to generate the JSON.
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"""
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query: Optional[QueryParams] = None
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"""Query arguments.
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"""
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txn_id: str = attr.ib(init=False)
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"""Unique ID for this request (for logging), this is autogenerated.
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"""
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uri: bytes = b""
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"""The URI of this request, usually generated from the above information.
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"""
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_generate_uri: bool = True
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"""True to automatically generate the uri field based on the above information.
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Set to False if manually configuring the URI.
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"""
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def __attrs_post_init__(self) -> None:
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global _next_id
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txn_id = "%s-O-%s" % (self.method, _next_id)
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_next_id = (_next_id + 1) % (MAXINT - 1)
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object.__setattr__(self, "txn_id", txn_id)
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if self._generate_uri:
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destination_bytes = self.destination.encode("ascii")
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path_bytes = self.path.encode("ascii")
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query_bytes = encode_query_args(self.query)
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# The object is frozen so we can pre-compute this.
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uri = urllib.parse.urlunparse(
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(
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b"matrix-federation",
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destination_bytes,
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path_bytes,
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None,
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query_bytes,
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b"",
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)
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)
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object.__setattr__(self, "uri", uri)
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def get_json(self) -> Optional[JsonDict]:
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if self.json_callback:
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return self.json_callback()
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return self.json
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class _BaseJsonParser(ByteParser[T]):
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"""A parser that buffers the response and tries to parse it as JSON."""
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CONTENT_TYPE = "application/json"
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def __init__(
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self, validator: Optional[Callable[[Optional[object]], bool]] = None
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) -> None:
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"""
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Args:
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validator: A callable which takes the parsed JSON value and returns
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true if the value is valid.
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"""
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self._buffer = StringIO()
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self._binary_wrapper = BinaryIOWrapper(self._buffer)
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self._validator = validator
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def write(self, data: bytes) -> int:
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return self._binary_wrapper.write(data)
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def finish(self) -> T:
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result = json_decoder.decode(self._buffer.getvalue())
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if self._validator is not None and not self._validator(result):
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raise ValueError(
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f"Received incorrect JSON value: {result.__class__.__name__}"
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)
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return result
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class JsonParser(_BaseJsonParser[JsonDict]):
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"""A parser that buffers the response and tries to parse it as a JSON object."""
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def __init__(self) -> None:
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super().__init__(self._validate)
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@staticmethod
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def _validate(v: Any) -> bool:
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return isinstance(v, dict)
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class LegacyJsonSendParser(_BaseJsonParser[Tuple[int, JsonDict]]):
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"""Ensure the legacy responses of /send_join & /send_leave are correct."""
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def __init__(self) -> None:
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super().__init__(self._validate)
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@staticmethod
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def _validate(v: Any) -> bool:
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# Match [integer, JSON dict]
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return (
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isinstance(v, list)
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and len(v) == 2
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and type(v[0]) == int # noqa: E721
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and isinstance(v[1], dict)
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)
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async def _handle_response(
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reactor: IReactorTime,
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timeout_sec: float,
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request: MatrixFederationRequest,
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response: IResponse,
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start_ms: int,
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parser: ByteParser[T],
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) -> T:
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"""
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Reads the body of a response with a timeout and sends it to a parser
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Args:
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reactor: twisted reactor, for the timeout
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timeout_sec: number of seconds to wait for response to complete
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request: the request that triggered the response
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response: response to the request
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start_ms: Timestamp when request was made
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parser: The parser for the response
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Returns:
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The parsed response
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"""
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max_response_size = parser.MAX_RESPONSE_SIZE
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finished = False
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try:
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check_content_type_is(response.headers, parser.CONTENT_TYPE)
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d = read_body_with_max_size(response, parser, max_response_size)
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d = timeout_deferred(d, timeout=timeout_sec, reactor=reactor)
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length = await make_deferred_yieldable(d)
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finished = True
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value = parser.finish()
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except BodyExceededMaxSize as e:
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# The response was too big.
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logger.warning(
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"{%s} [%s] JSON response exceeded max size %i - %s %s",
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request.txn_id,
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request.destination,
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max_response_size,
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request.method,
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request.uri.decode("ascii"),
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)
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raise RequestSendFailed(e, can_retry=False) from e
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except ValueError as e:
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# The content was invalid.
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logger.warning(
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"{%s} [%s] Failed to parse response - %s %s",
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request.txn_id,
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request.destination,
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request.method,
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request.uri.decode("ascii"),
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)
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raise RequestSendFailed(e, can_retry=False) from e
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except defer.TimeoutError as e:
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logger.warning(
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"{%s} [%s] Timed out reading response - %s %s",
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request.txn_id,
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request.destination,
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request.method,
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request.uri.decode("ascii"),
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)
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raise RequestSendFailed(e, can_retry=True) from e
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except ResponseFailed as e:
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logger.warning(
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"{%s} [%s] Failed to read response - %s %s",
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request.txn_id,
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request.destination,
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request.method,
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request.uri.decode("ascii"),
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)
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raise RequestSendFailed(e, can_retry=True) from e
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except Exception as e:
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logger.warning(
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"{%s} [%s] Error reading response %s %s: %s",
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request.txn_id,
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request.destination,
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request.method,
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request.uri.decode("ascii"),
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e,
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)
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raise
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finally:
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if not finished:
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# There was an exception and we didn't `finish()` the parse.
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# Let the parser know that it can free up any resources.
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try:
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parser.finish()
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except Exception:
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# Ignore any additional exceptions.
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pass
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time_taken_secs = reactor.seconds() - start_ms / 1000
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logger.info(
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"{%s} [%s] Completed request: %d %s in %.2f secs, got %d bytes - %s %s",
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request.txn_id,
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request.destination,
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response.code,
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response.phrase.decode("ascii", errors="replace"),
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time_taken_secs,
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length,
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request.method,
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request.uri.decode("ascii"),
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)
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return value
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class BinaryIOWrapper:
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"""A wrapper for a TextIO which converts from bytes on the fly."""
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def __init__(self, file: TextIO, encoding: str = "utf-8", errors: str = "strict"):
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self.decoder = codecs.getincrementaldecoder(encoding)(errors)
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self.file = file
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def write(self, b: Union[bytes, bytearray]) -> int:
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self.file.write(self.decoder.decode(b))
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return len(b)
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class MatrixFederationHttpClient:
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"""HTTP client used to talk to other homeservers over the federation
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protocol. Send client certificates and signs requests.
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Attributes:
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agent (twisted.web.client.Agent): The twisted Agent used to send the
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requests.
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"""
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def __init__(
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self,
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hs: "HomeServer",
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tls_client_options_factory: Optional[FederationPolicyForHTTPS],
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):
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self.hs = hs
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self.signing_key = hs.signing_key
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self.server_name = hs.hostname
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self.reactor = hs.get_reactor()
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user_agent = hs.version_string
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if hs.config.server.user_agent_suffix:
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user_agent = "%s %s" % (user_agent, hs.config.server.user_agent_suffix)
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outbound_federation_restricted_to = (
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hs.config.worker.outbound_federation_restricted_to
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)
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if hs.get_instance_name() in outbound_federation_restricted_to:
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# Talk to federation directly
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federation_agent: IAgent = MatrixFederationAgent(
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self.reactor,
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tls_client_options_factory,
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user_agent.encode("ascii"),
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hs.config.server.federation_ip_range_allowlist,
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hs.config.server.federation_ip_range_blocklist,
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)
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else:
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proxy_authorization_secret = hs.config.worker.worker_replication_secret
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assert (
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proxy_authorization_secret is not None
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), "`worker_replication_secret` must be set when using `outbound_federation_restricted_to` (used to authenticate requests across workers)"
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federation_proxy_credentials = BearerProxyCredentials(
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proxy_authorization_secret.encode("ascii")
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)
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# We need to talk to federation via the proxy via one of the configured
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# locations
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federation_proxy_locations = outbound_federation_restricted_to.locations
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federation_agent = ProxyAgent(
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self.reactor,
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self.reactor,
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tls_client_options_factory,
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federation_proxy_locations=federation_proxy_locations,
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federation_proxy_credentials=federation_proxy_credentials,
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)
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# Use a BlocklistingAgentWrapper to prevent circumventing the IP
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# blocking via IP literals in server names
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self.agent: IAgent = BlocklistingAgentWrapper(
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federation_agent,
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ip_blocklist=hs.config.server.federation_ip_range_blocklist,
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)
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self.clock = hs.get_clock()
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self._store = hs.get_datastores().main
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self.version_string_bytes = hs.version_string.encode("ascii")
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self.default_timeout_seconds = hs.config.federation.client_timeout_ms / 1000
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self.max_long_retry_delay_seconds = (
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hs.config.federation.max_long_retry_delay_ms / 1000
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)
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self.max_short_retry_delay_seconds = (
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hs.config.federation.max_short_retry_delay_ms / 1000
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)
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self.max_long_retries = hs.config.federation.max_long_retries
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self.max_short_retries = hs.config.federation.max_short_retries
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self._cooperator = Cooperator(scheduler=_make_scheduler(self.reactor))
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self._sleeper = AwakenableSleeper(self.reactor)
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def wake_destination(self, destination: str) -> None:
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"""Called when the remote server may have come back online."""
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self._sleeper.wake(destination)
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async def _send_request_with_optional_trailing_slash(
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self,
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request: MatrixFederationRequest,
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try_trailing_slash_on_400: bool = False,
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**send_request_args: Any,
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) -> IResponse:
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"""Wrapper for _send_request which can optionally retry the request
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upon receiving a combination of a 400 HTTP response code and a
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'M_UNRECOGNIZED' errcode. This is a workaround for Synapse <= v0.99.3
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due to https://github.com/matrix-org/synapse/issues/3622.
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Args:
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request: details of request to be sent
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try_trailing_slash_on_400: Whether on receiving a 400
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'M_UNRECOGNIZED' from the server to retry the request with a
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trailing slash appended to the request path.
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send_request_args: A dictionary of arguments to pass to `_send_request()`.
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Raises:
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HttpResponseException: If we get an HTTP response code >= 300
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(except 429).
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Returns:
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Parsed JSON response body.
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"""
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try:
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response = await self._send_request(request, **send_request_args)
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except HttpResponseException as e:
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# Received an HTTP error > 300. Check if it meets the requirements
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# to retry with a trailing slash
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if not try_trailing_slash_on_400:
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raise
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if e.code != 400 or e.to_synapse_error().errcode != "M_UNRECOGNIZED":
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raise
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# Retry with a trailing slash if we received a 400 with
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# 'M_UNRECOGNIZED' which some endpoints can return when omitting a
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# trailing slash on Synapse <= v0.99.3.
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logger.info("Retrying request with trailing slash")
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# Request is frozen so we create a new instance
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request = attr.evolve(request, path=request.path + "/")
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response = await self._send_request(request, **send_request_args)
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return response
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async def _send_request(
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self,
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request: MatrixFederationRequest,
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retry_on_dns_fail: bool = True,
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timeout: Optional[int] = None,
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long_retries: bool = False,
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ignore_backoff: bool = False,
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backoff_on_404: bool = False,
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backoff_on_all_error_codes: bool = False,
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follow_redirects: bool = False,
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) -> IResponse:
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"""
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Sends a request to the given server.
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Args:
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request: details of request to be sent
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retry_on_dns_fail: true if the request should be retried on DNS failures
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timeout: number of milliseconds to wait for the response headers
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(including connecting to the server), *for each attempt*.
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60s by default.
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long_retries: whether to use the long retry algorithm.
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The regular retry algorithm makes 4 attempts, with intervals
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[0.5s, 1s, 2s].
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The long retry algorithm makes 11 attempts, with intervals
|
|
[4s, 16s, 60s, 60s, ...]
|
|
|
|
Both algorithms add -20%/+40% jitter to the retry intervals.
|
|
|
|
Note that the above intervals are *in addition* to the time spent
|
|
waiting for the request to complete (up to `timeout` ms).
|
|
|
|
NB: the long retry algorithm takes over 20 minutes to complete, with a
|
|
default timeout of 60s! It's best not to use the `long_retries` option
|
|
for something that is blocking a client so we don't make them wait for
|
|
aaaaages, whereas some things like sending transactions (server to
|
|
server) we can be a lot more lenient but its very fuzzy / hand-wavey.
|
|
|
|
In the future, we could be more intelligent about doing this sort of
|
|
thing by looking at things with the bigger picture in mind,
|
|
https://github.com/matrix-org/synapse/issues/8917
|
|
|
|
ignore_backoff: true to ignore the historical backoff data
|
|
and try the request anyway.
|
|
|
|
backoff_on_404: Back off if we get a 404
|
|
backoff_on_all_error_codes: Back off if we get any error response
|
|
|
|
follow_redirects: True to follow the Location header of 307/308 redirect
|
|
responses. This does not recurse.
|
|
|
|
Returns:
|
|
Resolves with the HTTP response object on success.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
# Validate server name and log if it is an invalid destination, this is
|
|
# partially to help track down code paths where we haven't validated before here
|
|
try:
|
|
parse_and_validate_server_name(request.destination)
|
|
except ValueError:
|
|
logger.exception(f"Invalid destination: {request.destination}.")
|
|
raise FederationDeniedError(request.destination)
|
|
|
|
if timeout is not None:
|
|
_sec_timeout = timeout / 1000
|
|
else:
|
|
_sec_timeout = self.default_timeout_seconds
|
|
|
|
if (
|
|
self.hs.config.federation.federation_domain_whitelist is not None
|
|
and request.destination
|
|
not in self.hs.config.federation.federation_domain_whitelist
|
|
):
|
|
raise FederationDeniedError(request.destination)
|
|
|
|
limiter = await synapse.util.retryutils.get_retry_limiter(
|
|
request.destination,
|
|
self.clock,
|
|
self._store,
|
|
backoff_on_404=backoff_on_404,
|
|
ignore_backoff=ignore_backoff,
|
|
notifier=self.hs.get_notifier(),
|
|
replication_client=self.hs.get_replication_command_handler(),
|
|
backoff_on_all_error_codes=backoff_on_all_error_codes,
|
|
)
|
|
|
|
method_bytes = request.method.encode("ascii")
|
|
destination_bytes = request.destination.encode("ascii")
|
|
path_bytes = request.path.encode("ascii")
|
|
query_bytes = encode_query_args(request.query)
|
|
|
|
scope = start_active_span(
|
|
"outgoing-federation-request",
|
|
tags={
|
|
tags.SPAN_KIND: tags.SPAN_KIND_RPC_CLIENT,
|
|
tags.PEER_ADDRESS: request.destination,
|
|
tags.HTTP_METHOD: request.method,
|
|
tags.HTTP_URL: request.path,
|
|
},
|
|
finish_on_close=True,
|
|
)
|
|
|
|
# Inject the span into the headers
|
|
headers_dict: Dict[bytes, List[bytes]] = {}
|
|
opentracing.inject_header_dict(headers_dict, request.destination)
|
|
|
|
headers_dict[b"User-Agent"] = [self.version_string_bytes]
|
|
|
|
with limiter, scope:
|
|
# XXX: Would be much nicer to retry only at the transaction-layer
|
|
# (once we have reliable transactions in place)
|
|
if long_retries:
|
|
retries_left = self.max_long_retries
|
|
else:
|
|
retries_left = self.max_short_retries
|
|
|
|
url_bytes = request.uri
|
|
url_str = url_bytes.decode("ascii")
|
|
|
|
url_to_sign_bytes = urllib.parse.urlunparse(
|
|
(b"", b"", path_bytes, None, query_bytes, b"")
|
|
)
|
|
|
|
while True:
|
|
try:
|
|
json = request.get_json()
|
|
if json:
|
|
headers_dict[b"Content-Type"] = [b"application/json"]
|
|
auth_headers = self.build_auth_headers(
|
|
destination_bytes, method_bytes, url_to_sign_bytes, json
|
|
)
|
|
data = encode_canonical_json(json)
|
|
producer: Optional[IBodyProducer] = QuieterFileBodyProducer(
|
|
BytesIO(data), cooperator=self._cooperator
|
|
)
|
|
else:
|
|
producer = None
|
|
auth_headers = self.build_auth_headers(
|
|
destination_bytes, method_bytes, url_to_sign_bytes
|
|
)
|
|
|
|
headers_dict[b"Authorization"] = auth_headers
|
|
|
|
logger.debug(
|
|
"{%s} [%s] Sending request: %s %s; timeout %fs",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
url_str,
|
|
_sec_timeout,
|
|
)
|
|
|
|
outgoing_requests_counter.labels(request.method).inc()
|
|
|
|
try:
|
|
with Measure(self.clock, "outbound_request"):
|
|
# we don't want all the fancy cookie and redirect handling
|
|
# that treq.request gives: just use the raw Agent.
|
|
|
|
# To preserve the logging context, the timeout is treated
|
|
# in a similar way to `defer.gatherResults`:
|
|
# * Each logging context-preserving fork is wrapped in
|
|
# `run_in_background`. In this case there is only one,
|
|
# since the timeout fork is not logging-context aware.
|
|
# * The `Deferred` that joins the forks back together is
|
|
# wrapped in `make_deferred_yieldable` to restore the
|
|
# logging context regardless of the path taken.
|
|
request_deferred = run_in_background(
|
|
self.agent.request,
|
|
method_bytes,
|
|
url_bytes,
|
|
headers=Headers(headers_dict),
|
|
bodyProducer=producer,
|
|
)
|
|
request_deferred = timeout_deferred(
|
|
request_deferred,
|
|
timeout=_sec_timeout,
|
|
reactor=self.reactor,
|
|
)
|
|
|
|
response = await make_deferred_yieldable(request_deferred)
|
|
except DNSLookupError as e:
|
|
raise RequestSendFailed(e, can_retry=retry_on_dns_fail) from e
|
|
except Exception as e:
|
|
raise RequestSendFailed(e, can_retry=True) from e
|
|
|
|
incoming_responses_counter.labels(
|
|
request.method, response.code
|
|
).inc()
|
|
|
|
set_tag(tags.HTTP_STATUS_CODE, response.code)
|
|
response_phrase = response.phrase.decode("ascii", errors="replace")
|
|
|
|
if 200 <= response.code < 300:
|
|
logger.debug(
|
|
"{%s} [%s] Got response headers: %d %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
response.code,
|
|
response_phrase,
|
|
)
|
|
elif (
|
|
response.code in (307, 308)
|
|
and follow_redirects
|
|
and response.headers.hasHeader("Location")
|
|
):
|
|
# The Location header *might* be relative so resolve it.
|
|
location = response.headers.getRawHeaders(b"Location")[0]
|
|
new_uri = urllib.parse.urljoin(request.uri, location)
|
|
|
|
return await self._send_request(
|
|
attr.evolve(request, uri=new_uri, generate_uri=False),
|
|
retry_on_dns_fail,
|
|
timeout,
|
|
long_retries,
|
|
ignore_backoff,
|
|
backoff_on_404,
|
|
backoff_on_all_error_codes,
|
|
# Do not continue following redirects.
|
|
follow_redirects=False,
|
|
)
|
|
else:
|
|
logger.info(
|
|
"{%s} [%s] Got response headers: %d %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
response.code,
|
|
response_phrase,
|
|
)
|
|
# :'(
|
|
# Update transactions table?
|
|
d = treq.content(response)
|
|
d = timeout_deferred(
|
|
d, timeout=_sec_timeout, reactor=self.reactor
|
|
)
|
|
|
|
try:
|
|
body = await make_deferred_yieldable(d)
|
|
except Exception as e:
|
|
# Eh, we're already going to raise an exception so lets
|
|
# ignore if this fails.
|
|
logger.warning(
|
|
"{%s} [%s] Failed to get error response: %s %s: %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
url_str,
|
|
_flatten_response_never_received(e),
|
|
)
|
|
body = None
|
|
|
|
exc = HttpResponseException(
|
|
response.code, response_phrase, body
|
|
)
|
|
|
|
# Retry if the error is a 5xx or a 429 (Too Many
|
|
# Requests), otherwise just raise a standard
|
|
# `HttpResponseException`
|
|
if 500 <= response.code < 600 or response.code == 429:
|
|
raise RequestSendFailed(exc, can_retry=True) from exc
|
|
else:
|
|
raise exc
|
|
|
|
break
|
|
except RequestSendFailed as e:
|
|
logger.info(
|
|
"{%s} [%s] Request failed: %s %s: %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
url_str,
|
|
_flatten_response_never_received(e.inner_exception),
|
|
)
|
|
|
|
if not e.can_retry:
|
|
raise
|
|
|
|
if retries_left and not timeout:
|
|
if long_retries:
|
|
delay_seconds = 4 ** (
|
|
self.max_long_retries + 1 - retries_left
|
|
)
|
|
delay_seconds = min(
|
|
delay_seconds, self.max_long_retry_delay_seconds
|
|
)
|
|
delay_seconds *= random.uniform(0.8, 1.4)
|
|
else:
|
|
delay_seconds = 0.5 * 2 ** (
|
|
self.max_short_retries - retries_left
|
|
)
|
|
delay_seconds = min(
|
|
delay_seconds, self.max_short_retry_delay_seconds
|
|
)
|
|
delay_seconds *= random.uniform(0.8, 1.4)
|
|
|
|
logger.debug(
|
|
"{%s} [%s] Waiting %ss before re-sending...",
|
|
request.txn_id,
|
|
request.destination,
|
|
delay_seconds,
|
|
)
|
|
|
|
# Sleep for the calculated delay, or wake up immediately
|
|
# if we get notified that the server is back up.
|
|
await self._sleeper.sleep(
|
|
request.destination, delay_seconds * 1000
|
|
)
|
|
retries_left -= 1
|
|
else:
|
|
raise
|
|
|
|
except Exception as e:
|
|
logger.warning(
|
|
"{%s} [%s] Request failed: %s %s: %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
url_str,
|
|
_flatten_response_never_received(e),
|
|
)
|
|
raise
|
|
return response
|
|
|
|
def build_auth_headers(
|
|
self,
|
|
destination: Optional[bytes],
|
|
method: bytes,
|
|
url_bytes: bytes,
|
|
content: Optional[JsonDict] = None,
|
|
destination_is: Optional[bytes] = None,
|
|
) -> List[bytes]:
|
|
"""
|
|
Builds the Authorization headers for a federation request
|
|
Args:
|
|
destination: The destination homeserver of the request.
|
|
May be None if the destination is an identity server, in which case
|
|
destination_is must be non-None.
|
|
method: The HTTP method of the request
|
|
url_bytes: The URI path of the request
|
|
content: The body of the request
|
|
destination_is: As 'destination', but if the destination is an
|
|
identity server
|
|
|
|
Returns:
|
|
A list of headers to be added as "Authorization:" headers
|
|
"""
|
|
if not destination and not destination_is:
|
|
raise ValueError(
|
|
"At least one of the arguments destination and destination_is "
|
|
"must be a nonempty bytestring."
|
|
)
|
|
|
|
request: JsonDict = {
|
|
"method": method.decode("ascii"),
|
|
"uri": url_bytes.decode("ascii"),
|
|
"origin": self.server_name,
|
|
}
|
|
|
|
if destination is not None:
|
|
request["destination"] = destination.decode("ascii")
|
|
|
|
if destination_is is not None:
|
|
request["destination_is"] = destination_is.decode("ascii")
|
|
|
|
if content is not None:
|
|
request["content"] = content
|
|
|
|
request = sign_json(request, self.server_name, self.signing_key)
|
|
|
|
auth_headers = []
|
|
|
|
for key, sig in request["signatures"][self.server_name].items():
|
|
auth_headers.append(
|
|
(
|
|
'X-Matrix origin="%s",key="%s",sig="%s",destination="%s"'
|
|
% (
|
|
self.server_name,
|
|
key,
|
|
sig,
|
|
request.get("destination") or request["destination_is"],
|
|
)
|
|
).encode("ascii")
|
|
)
|
|
return auth_headers
|
|
|
|
@overload
|
|
async def put_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
data: Optional[JsonDict] = None,
|
|
json_data_callback: Optional[Callable[[], JsonDict]] = None,
|
|
long_retries: bool = False,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
backoff_on_404: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Literal[None] = None,
|
|
backoff_on_all_error_codes: bool = False,
|
|
) -> JsonDict:
|
|
...
|
|
|
|
@overload
|
|
async def put_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
data: Optional[JsonDict] = None,
|
|
json_data_callback: Optional[Callable[[], JsonDict]] = None,
|
|
long_retries: bool = False,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
backoff_on_404: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Optional[ByteParser[T]] = None,
|
|
backoff_on_all_error_codes: bool = False,
|
|
) -> T:
|
|
...
|
|
|
|
async def put_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
data: Optional[JsonDict] = None,
|
|
json_data_callback: Optional[Callable[[], JsonDict]] = None,
|
|
long_retries: bool = False,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
backoff_on_404: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Optional[ByteParser[T]] = None,
|
|
backoff_on_all_error_codes: bool = False,
|
|
) -> Union[JsonDict, T]:
|
|
"""Sends the specified json data using PUT
|
|
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
path: The HTTP path.
|
|
args: query params
|
|
data: A dict containing the data that will be used as
|
|
the request body. This will be encoded as JSON.
|
|
json_data_callback: A callable returning the dict to
|
|
use as the request body.
|
|
|
|
long_retries: whether to use the long retry algorithm. See
|
|
docs on _send_request for details.
|
|
|
|
timeout: number of milliseconds to wait for the response.
|
|
self._default_timeout (60s) by default.
|
|
|
|
Note that we may make several attempts to send the request; this
|
|
timeout applies to the time spent waiting for response headers for
|
|
*each* attempt (including connection time) as well as the time spent
|
|
reading the response body after a 200 response.
|
|
|
|
ignore_backoff: true to ignore the historical backoff data
|
|
and try the request anyway.
|
|
backoff_on_404: True if we should count a 404 response as
|
|
a failure of the server (and should therefore back off future
|
|
requests).
|
|
try_trailing_slash_on_400: True if on a 400 M_UNRECOGNIZED
|
|
response we should try appending a trailing slash to the end
|
|
of the request. Workaround for https://github.com/matrix-org/synapse/issues/3622
|
|
in Synapse <= v0.99.3. This will be attempted before backing off if
|
|
backing off has been enabled.
|
|
parser: The parser to use to decode the response. Defaults to
|
|
parsing as JSON.
|
|
backoff_on_all_error_codes: Back off if we get any error response
|
|
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response. The
|
|
result will be the decoded JSON body.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
request = MatrixFederationRequest(
|
|
method="PUT",
|
|
destination=destination,
|
|
path=path,
|
|
query=args,
|
|
json_callback=json_data_callback,
|
|
json=data,
|
|
)
|
|
|
|
start_ms = self.clock.time_msec()
|
|
|
|
response = await self._send_request_with_optional_trailing_slash(
|
|
request,
|
|
try_trailing_slash_on_400,
|
|
backoff_on_404=backoff_on_404,
|
|
ignore_backoff=ignore_backoff,
|
|
long_retries=long_retries,
|
|
timeout=timeout,
|
|
backoff_on_all_error_codes=backoff_on_all_error_codes,
|
|
)
|
|
|
|
if timeout is not None:
|
|
_sec_timeout = timeout / 1000
|
|
else:
|
|
_sec_timeout = self.default_timeout_seconds
|
|
|
|
if parser is None:
|
|
parser = cast(ByteParser[T], JsonParser())
|
|
|
|
body = await _handle_response(
|
|
self.reactor,
|
|
_sec_timeout,
|
|
request,
|
|
response,
|
|
start_ms,
|
|
parser=parser,
|
|
)
|
|
|
|
return body
|
|
|
|
async def post_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
data: Optional[JsonDict] = None,
|
|
long_retries: bool = False,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
args: Optional[QueryParams] = None,
|
|
) -> JsonDict:
|
|
"""Sends the specified json data using POST
|
|
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
|
|
path: The HTTP path.
|
|
|
|
data: A dict containing the data that will be used as
|
|
the request body. This will be encoded as JSON.
|
|
|
|
long_retries: whether to use the long retry algorithm. See
|
|
docs on _send_request for details.
|
|
|
|
timeout: number of milliseconds to wait for the response.
|
|
self._default_timeout (60s) by default.
|
|
|
|
Note that we may make several attempts to send the request; this
|
|
timeout applies to the time spent waiting for response headers for
|
|
*each* attempt (including connection time) as well as the time spent
|
|
reading the response body after a 200 response.
|
|
|
|
ignore_backoff: true to ignore the historical backoff data and
|
|
try the request anyway.
|
|
|
|
args: query params
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response. The result will be the decoded JSON body.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
|
|
request = MatrixFederationRequest(
|
|
method="POST", destination=destination, path=path, query=args, json=data
|
|
)
|
|
|
|
start_ms = self.clock.time_msec()
|
|
|
|
response = await self._send_request(
|
|
request,
|
|
long_retries=long_retries,
|
|
timeout=timeout,
|
|
ignore_backoff=ignore_backoff,
|
|
)
|
|
|
|
if timeout is not None:
|
|
_sec_timeout = timeout / 1000
|
|
else:
|
|
_sec_timeout = self.default_timeout_seconds
|
|
|
|
body = await _handle_response(
|
|
self.reactor, _sec_timeout, request, response, start_ms, parser=JsonParser()
|
|
)
|
|
return body
|
|
|
|
@overload
|
|
async def get_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
retry_on_dns_fail: bool = True,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Literal[None] = None,
|
|
) -> JsonDict:
|
|
...
|
|
|
|
@overload
|
|
async def get_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = ...,
|
|
retry_on_dns_fail: bool = ...,
|
|
timeout: Optional[int] = ...,
|
|
ignore_backoff: bool = ...,
|
|
try_trailing_slash_on_400: bool = ...,
|
|
parser: ByteParser[T] = ...,
|
|
) -> T:
|
|
...
|
|
|
|
async def get_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
retry_on_dns_fail: bool = True,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Optional[ByteParser[T]] = None,
|
|
) -> Union[JsonDict, T]:
|
|
"""GETs some json from the given host homeserver and path
|
|
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
|
|
path: The HTTP path.
|
|
|
|
args: A dictionary used to create query strings, defaults to
|
|
None.
|
|
|
|
retry_on_dns_fail: true if the request should be retried on DNS failures
|
|
|
|
timeout: number of milliseconds to wait for the response.
|
|
self._default_timeout (60s) by default.
|
|
|
|
Note that we may make several attempts to send the request; this
|
|
timeout applies to the time spent waiting for response headers for
|
|
*each* attempt (including connection time) as well as the time spent
|
|
reading the response body after a 200 response.
|
|
|
|
ignore_backoff: true to ignore the historical backoff data
|
|
and try the request anyway.
|
|
|
|
try_trailing_slash_on_400: True if on a 400 M_UNRECOGNIZED
|
|
response we should try appending a trailing slash to the end of
|
|
the request. Workaround for https://github.com/matrix-org/synapse/issues/3622
|
|
in Synapse <= v0.99.3.
|
|
|
|
parser: The parser to use to decode the response. Defaults to
|
|
parsing as JSON.
|
|
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response. The
|
|
result will be the decoded JSON body.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
json_dict, _ = await self.get_json_with_headers(
|
|
destination=destination,
|
|
path=path,
|
|
args=args,
|
|
retry_on_dns_fail=retry_on_dns_fail,
|
|
timeout=timeout,
|
|
ignore_backoff=ignore_backoff,
|
|
try_trailing_slash_on_400=try_trailing_slash_on_400,
|
|
parser=parser,
|
|
)
|
|
return json_dict
|
|
|
|
@overload
|
|
async def get_json_with_headers(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
retry_on_dns_fail: bool = True,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Literal[None] = None,
|
|
) -> Tuple[JsonDict, Dict[bytes, List[bytes]]]:
|
|
...
|
|
|
|
@overload
|
|
async def get_json_with_headers(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = ...,
|
|
retry_on_dns_fail: bool = ...,
|
|
timeout: Optional[int] = ...,
|
|
ignore_backoff: bool = ...,
|
|
try_trailing_slash_on_400: bool = ...,
|
|
parser: ByteParser[T] = ...,
|
|
) -> Tuple[T, Dict[bytes, List[bytes]]]:
|
|
...
|
|
|
|
async def get_json_with_headers(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
args: Optional[QueryParams] = None,
|
|
retry_on_dns_fail: bool = True,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
try_trailing_slash_on_400: bool = False,
|
|
parser: Optional[ByteParser[T]] = None,
|
|
) -> Tuple[Union[JsonDict, T], Dict[bytes, List[bytes]]]:
|
|
"""GETs some json from the given host homeserver and path
|
|
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
|
|
path: The HTTP path.
|
|
|
|
args: A dictionary used to create query strings, defaults to
|
|
None.
|
|
|
|
retry_on_dns_fail: true if the request should be retried on DNS failures
|
|
|
|
timeout: number of milliseconds to wait for the response.
|
|
self._default_timeout (60s) by default.
|
|
|
|
Note that we may make several attempts to send the request; this
|
|
timeout applies to the time spent waiting for response headers for
|
|
*each* attempt (including connection time) as well as the time spent
|
|
reading the response body after a 200 response.
|
|
|
|
ignore_backoff: true to ignore the historical backoff data
|
|
and try the request anyway.
|
|
|
|
try_trailing_slash_on_400: True if on a 400 M_UNRECOGNIZED
|
|
response we should try appending a trailing slash to the end of
|
|
the request. Workaround for https://github.com/matrix-org/synapse/issues/3622
|
|
in Synapse <= v0.99.3.
|
|
|
|
parser: The parser to use to decode the response. Defaults to
|
|
parsing as JSON.
|
|
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response. The result will be a tuple of the
|
|
decoded JSON body and a dict of the response headers.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
request = MatrixFederationRequest(
|
|
method="GET", destination=destination, path=path, query=args
|
|
)
|
|
|
|
start_ms = self.clock.time_msec()
|
|
|
|
response = await self._send_request_with_optional_trailing_slash(
|
|
request,
|
|
try_trailing_slash_on_400,
|
|
backoff_on_404=False,
|
|
ignore_backoff=ignore_backoff,
|
|
retry_on_dns_fail=retry_on_dns_fail,
|
|
timeout=timeout,
|
|
)
|
|
|
|
headers = dict(response.headers.getAllRawHeaders())
|
|
|
|
if timeout is not None:
|
|
_sec_timeout = timeout / 1000
|
|
else:
|
|
_sec_timeout = self.default_timeout_seconds
|
|
|
|
if parser is None:
|
|
parser = cast(ByteParser[T], JsonParser())
|
|
|
|
body = await _handle_response(
|
|
self.reactor,
|
|
_sec_timeout,
|
|
request,
|
|
response,
|
|
start_ms,
|
|
parser=parser,
|
|
)
|
|
|
|
return body, headers
|
|
|
|
async def delete_json(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
long_retries: bool = False,
|
|
timeout: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
args: Optional[QueryParams] = None,
|
|
) -> JsonDict:
|
|
"""Send a DELETE request to the remote expecting some json response
|
|
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
path: The HTTP path.
|
|
|
|
long_retries: whether to use the long retry algorithm. See
|
|
docs on _send_request for details.
|
|
|
|
timeout: number of milliseconds to wait for the response.
|
|
self._default_timeout (60s) by default.
|
|
|
|
Note that we may make several attempts to send the request; this
|
|
timeout applies to the time spent waiting for response headers for
|
|
*each* attempt (including connection time) as well as the time spent
|
|
reading the response body after a 200 response.
|
|
|
|
ignore_backoff: true to ignore the historical backoff data and
|
|
try the request anyway.
|
|
|
|
args: query params
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response. The
|
|
result will be the decoded JSON body.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
request = MatrixFederationRequest(
|
|
method="DELETE", destination=destination, path=path, query=args
|
|
)
|
|
|
|
start_ms = self.clock.time_msec()
|
|
|
|
response = await self._send_request(
|
|
request,
|
|
long_retries=long_retries,
|
|
timeout=timeout,
|
|
ignore_backoff=ignore_backoff,
|
|
)
|
|
|
|
if timeout is not None:
|
|
_sec_timeout = timeout / 1000
|
|
else:
|
|
_sec_timeout = self.default_timeout_seconds
|
|
|
|
body = await _handle_response(
|
|
self.reactor, _sec_timeout, request, response, start_ms, parser=JsonParser()
|
|
)
|
|
return body
|
|
|
|
async def get_file(
|
|
self,
|
|
destination: str,
|
|
path: str,
|
|
output_stream: BinaryIO,
|
|
args: Optional[QueryParams] = None,
|
|
retry_on_dns_fail: bool = True,
|
|
max_size: Optional[int] = None,
|
|
ignore_backoff: bool = False,
|
|
follow_redirects: bool = False,
|
|
) -> Tuple[int, Dict[bytes, List[bytes]]]:
|
|
"""GETs a file from a given homeserver
|
|
Args:
|
|
destination: The remote server to send the HTTP request to.
|
|
path: The HTTP path to GET.
|
|
output_stream: File to write the response body to.
|
|
args: Optional dictionary used to create the query string.
|
|
ignore_backoff: true to ignore the historical backoff data
|
|
and try the request anyway.
|
|
follow_redirects: True to follow the Location header of 307/308 redirect
|
|
responses. This does not recurse.
|
|
|
|
Returns:
|
|
Resolves with an (int,dict) tuple of
|
|
the file length and a dict of the response headers.
|
|
|
|
Raises:
|
|
HttpResponseException: If we get an HTTP response code >= 300
|
|
(except 429).
|
|
NotRetryingDestination: If we are not yet ready to retry this
|
|
server.
|
|
FederationDeniedError: If this destination is not on our
|
|
federation whitelist
|
|
RequestSendFailed: If there were problems connecting to the
|
|
remote, due to e.g. DNS failures, connection timeouts etc.
|
|
"""
|
|
request = MatrixFederationRequest(
|
|
method="GET", destination=destination, path=path, query=args
|
|
)
|
|
|
|
response = await self._send_request(
|
|
request,
|
|
retry_on_dns_fail=retry_on_dns_fail,
|
|
ignore_backoff=ignore_backoff,
|
|
follow_redirects=follow_redirects,
|
|
)
|
|
|
|
headers = dict(response.headers.getAllRawHeaders())
|
|
|
|
try:
|
|
d = read_body_with_max_size(response, output_stream, max_size)
|
|
d.addTimeout(self.default_timeout_seconds, self.reactor)
|
|
length = await make_deferred_yieldable(d)
|
|
except BodyExceededMaxSize:
|
|
msg = "Requested file is too large > %r bytes" % (max_size,)
|
|
logger.warning(
|
|
"{%s} [%s] %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
msg,
|
|
)
|
|
raise SynapseError(HTTPStatus.BAD_GATEWAY, msg, Codes.TOO_LARGE)
|
|
except defer.TimeoutError as e:
|
|
logger.warning(
|
|
"{%s} [%s] Timed out reading response - %s %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
request.uri.decode("ascii"),
|
|
)
|
|
raise RequestSendFailed(e, can_retry=True) from e
|
|
except ResponseFailed as e:
|
|
logger.warning(
|
|
"{%s} [%s] Failed to read response - %s %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
request.method,
|
|
request.uri.decode("ascii"),
|
|
)
|
|
raise RequestSendFailed(e, can_retry=True) from e
|
|
except Exception as e:
|
|
logger.warning(
|
|
"{%s} [%s] Error reading response: %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
e,
|
|
)
|
|
raise
|
|
logger.info(
|
|
"{%s} [%s] Completed: %d %s [%d bytes] %s %s",
|
|
request.txn_id,
|
|
request.destination,
|
|
response.code,
|
|
response.phrase.decode("ascii", errors="replace"),
|
|
length,
|
|
request.method,
|
|
request.uri.decode("ascii"),
|
|
)
|
|
return length, headers
|
|
|
|
|
|
def _flatten_response_never_received(e: BaseException) -> str:
|
|
if hasattr(e, "reasons"):
|
|
reasons = ", ".join(
|
|
_flatten_response_never_received(f.value) for f in e.reasons
|
|
)
|
|
|
|
return "%s:[%s]" % (type(e).__name__, reasons)
|
|
else:
|
|
return repr(e)
|
|
|
|
|
|
def check_content_type_is(headers: Headers, expected_content_type: str) -> None:
|
|
"""
|
|
Check that a set of HTTP headers have a Content-Type header, and that it
|
|
is the expected value..
|
|
|
|
Args:
|
|
headers: headers to check
|
|
|
|
Raises:
|
|
RequestSendFailed: if the Content-Type header is missing or doesn't match
|
|
|
|
"""
|
|
content_type_headers = headers.getRawHeaders(b"Content-Type")
|
|
if content_type_headers is None:
|
|
raise RequestSendFailed(
|
|
RuntimeError("No Content-Type header received from remote server"),
|
|
can_retry=False,
|
|
)
|
|
|
|
c_type = content_type_headers[0].decode("ascii") # only the first header
|
|
val, options = cgi.parse_header(c_type)
|
|
if val != expected_content_type:
|
|
raise RequestSendFailed(
|
|
RuntimeError(
|
|
f"Remote server sent Content-Type header of '{c_type}', not '{expected_content_type}'",
|
|
),
|
|
can_retry=False,
|
|
)
|