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https://github.com/1f349/dendrite.git
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Reduce 500s (#1017)
* Try to avoid returning 500s on /send * Don't return 500s from media API download requests * Don't 500 on context errors * Update sytest-whitelist * Fix lint, add comments
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@ -74,28 +74,17 @@ func Send(
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util.GetLogger(httpReq.Context()).Infof("Received transaction %q containing %d PDUs, %d EDUs", txnID, len(t.PDUs), len(t.EDUs))
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resp, err := t.processTransaction()
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switch err.(type) {
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// No error? Great! Send back a 200.
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case nil:
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: resp,
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}
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// Handle known error cases as we will return a 400 error for these.
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case roomNotFoundError:
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case unmarshalError:
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case verifySigError:
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// Handle unknown error cases. Sending 500 errors back should be a last
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// resort as this can make other homeservers back off sending federation
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// events.
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default:
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("t.processTransaction failed")
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return jsonerror.InternalServerError()
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}
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// Return a 400 error for bad requests as fallen through from above.
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// https://matrix.org/docs/spec/server_server/r0.1.3#put-matrix-federation-v1-send-txnid
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// Status code 200:
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// The result of processing the transaction. The server is to use this response
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// even in the event of one or more PDUs failing to be processed.
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(err.Error()),
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Code: http.StatusOK,
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JSON: resp,
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}
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}
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@ -135,30 +124,39 @@ func (t *txnReq) processTransaction() (*gomatrixserverlib.RespSend, error) {
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}
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if err := json.Unmarshal(pdu, &header); err != nil {
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util.GetLogger(t.context).WithError(err).Warn("Transaction: Failed to extract room ID from event")
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return nil, unmarshalError{err}
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// We don't know the event ID at this point so we can't return the
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// failure in the PDU results
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continue
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}
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verReq := api.QueryRoomVersionForRoomRequest{RoomID: header.RoomID}
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verRes := api.QueryRoomVersionForRoomResponse{}
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if err := t.rsAPI.QueryRoomVersionForRoom(t.context, &verReq, &verRes); err != nil {
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util.GetLogger(t.context).WithError(err).Warn("Transaction: Failed to query room version for room", verReq.RoomID)
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return nil, roomNotFoundError{verReq.RoomID}
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// We don't know the event ID at this point so we can't return the
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// failure in the PDU results
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continue
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}
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event, err := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, verRes.RoomVersion)
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if err != nil {
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util.GetLogger(t.context).WithError(err).Warnf("Transaction: Failed to parse event JSON of event %q", event.EventID())
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return nil, unmarshalError{err}
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results[event.EventID()] = gomatrixserverlib.PDUResult{
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Error: err.Error(),
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}
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continue
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}
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if err := gomatrixserverlib.VerifyAllEventSignatures(t.context, []gomatrixserverlib.Event{event}, t.keys); err != nil {
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if err = gomatrixserverlib.VerifyAllEventSignatures(t.context, []gomatrixserverlib.Event{event}, t.keys); err != nil {
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util.GetLogger(t.context).WithError(err).Warnf("Transaction: Couldn't validate signature of event %q", event.EventID())
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return nil, verifySigError{event.EventID(), err}
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results[event.EventID()] = gomatrixserverlib.PDUResult{
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Error: err.Error(),
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}
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continue
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}
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pdus = append(pdus, event.Headered(verRes.RoomVersion))
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}
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// Process the events.
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for _, e := range pdus {
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err := t.processEvent(e.Unwrap(), true)
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if err != nil {
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if err := t.processEvent(e.Unwrap(), true); err != nil {
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// If the error is due to the event itself being bad then we skip
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// it and move onto the next event. We report an error so that the
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// sender knows that we have skipped processing it.
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@ -174,20 +172,17 @@ func (t *txnReq) processTransaction() (*gomatrixserverlib.RespSend, error) {
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// receive another event referencing it.
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// If we bail and stop processing then we risk wedging incoming
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// transactions from that server forever.
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switch err.(type) {
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case roomNotFoundError:
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case *gomatrixserverlib.NotAllowed:
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case missingPrevEventsError:
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default:
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util.GetLogger(t.context).Warnf("Processing %s failed: %s", e.EventID(), err)
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if isProcessingErrorFatal(err) {
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// Any other error should be the result of a temporary error in
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// our server so we should bail processing the transaction entirely.
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util.GetLogger(t.context).Warnf("Processing %s failed fatally: %s", e.EventID(), err)
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return nil, err
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} else {
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util.GetLogger(t.context).WithError(err).WithField("event_id", e.EventID()).Warn("Failed to process incoming federation event, skipping")
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results[e.EventID()] = gomatrixserverlib.PDUResult{
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Error: err.Error(),
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}
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}
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results[e.EventID()] = gomatrixserverlib.PDUResult{
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Error: err.Error(),
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}
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util.GetLogger(t.context).WithError(err).WithField("event_id", e.EventID()).Warn("Failed to process incoming federation event, skipping it.")
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} else {
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results[e.EventID()] = gomatrixserverlib.PDUResult{}
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}
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@ -198,6 +193,25 @@ func (t *txnReq) processTransaction() (*gomatrixserverlib.RespSend, error) {
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return &gomatrixserverlib.RespSend{PDUs: results}, nil
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}
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// isProcessingErrorFatal returns true if the error is really bad and
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// we should stop processing the transaction, and returns false if it
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// is just some less serious error about a specific event.
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func isProcessingErrorFatal(err error) bool {
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switch err.(type) {
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case roomNotFoundError:
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case *gomatrixserverlib.NotAllowed:
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case missingPrevEventsError:
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default:
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switch err {
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case context.Canceled:
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case context.DeadlineExceeded:
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default:
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return true
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}
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}
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return false
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}
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type roomNotFoundError struct {
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roomID string
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}
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