MirrorHub/synapse
0
0
Fork 1
mirror of https://mau.dev/maunium/synapse.git synced 2024-06-08 21:58:53 +02:00
Code Issues Projects Releases Wiki Activity

Explain SynapseError and FederationError better (#14191)

Browse source 
Explain `SynapseError` and `FederationError` better

Spawning from https://github.com/matrix-org/synapse/pull/13816#discussion_r993262622
This commit is contained in:
Eric Eastwood 2022-10-19 15:39:43 -05:00 committed by GitHub
parent 3841900aaa
commit 70b3396506
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 30 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
changelog.d/14191.doc Normal file
View file

@ -0,0 +1 @@
Update docstrings of `SynapseError` and `FederationError` to bettter describe what they are used for and the effects of using them are.

24
synapse/api/errors.py
View file

@ -155,7 +155,13 @@ class RedirectException(CodeMessageException):
class SynapseError(CodeMessageException):
"""A base exception type for matrix errors which have an errcode and error
message (as well as an HTTP status code).
message (as well as an HTTP status code). These often bubble all the way up to the
client API response so the error code and status often reach the client directly as
defined here. If the error doesn't make sense to present to a client, then it
probably shouldn't be a `SynapseError`. For example, if we contact another
homeserver over federation, we shouldn't automatically ferry response errors back to
the client on our end (a 500 from a remote server does not make sense to a client
when our server did not experience a 500).
Attributes:
errcode: Matrix error code e.g 'M_FORBIDDEN'
@ -600,8 +606,20 @@ def cs_error(msg: str, code: str = Codes.UNKNOWN, **kwargs: Any) -> "JsonDict":
class FederationError(RuntimeError):
"""This class is used to inform remote homeservers about erroneous
PDUs they sent us.
"""
Raised when we process an erroneous PDU.
There are two kinds of scenarios where this exception can be raised:
1. We may pull an invalid PDU from a remote homeserver (e.g. during backfill). We
raise this exception to signal an error to the rest of the application.
2. We may be pushed an invalid PDU as part of a `/send` transaction from a remote
homeserver. We raise so that we can respond to the transaction and include the
error string in the "PDU Processing Result". The message which will likely be
ignored by the remote homeserver and is not machine parse-able since it's just a
string.
TODO: In the future, we should split these usage scenarios into their own error types.
FATAL: The remote server could not interpret the source event.
(e.g., it was missing a required field)

8
synapse/federation/federation_server.py
View file

@ -481,6 +481,14 @@ class FederationServer(FederationBase):
pdu_results[pdu.event_id] = await process_pdu(pdu)
async def process_pdu(pdu: EventBase) -> JsonDict:
"""
Processes a pushed PDU sent to us via a `/send` transaction
Returns:
JsonDict representing a "PDU Processing Result" that will be bundled up
with the other processed PDU's in the `/send` transaction and sent back
to remote homeserver.
"""
event_id = pdu.event_id
with nested_logging_context(event_id):
try: