Roomserver/federation input refactor (#2104)

* Put federation client functions into their own file

* Look for missing auth events in RS input

* Remove retrieveMissingAuthEvents from federation API

* Logging

* Sorta transplanted the code over

* Use event origin failing all else

* Don't get stuck on mutexes:

* Add verifier

* Don't mark state events with zero snapshot NID as not existing

* Check missing state if not an outlier before storing the event

* Reject instead of soft-fail, don't copy roominfo so much

* Use synchronous contexts, limit time to fetch missing events

* Clean up some commented out bits

* Simplify `/send` endpoint significantly

* Submit async

* Report errors on sending to RS input

* Set max payload in NATS to 16MB

* Tweak metrics

* Add `workerForRoom` for tidiness

* Try skipping unmarshalling errors for RespMissingEvents

* Track missing prev events separately to avoid calculating state when not possible

* Tweak logic around checking missing state

* Care about state when checking missing prev events

* Don't check missing state for create events

* Try that again

* Handle create events better

* Send create room events as new

* Use given event kind when sending auth/state events

* Revert "Use given event kind when sending auth/state events"

This reverts commit 089d64d271.

* Only search for missing prev events or state for new events

* Tweaks

* We only have missing prev if we don't supply state

* Room version tweaks

* Allow async inputs again

* Apply backpressure to consumers/synchronous requests to hopefully stop things being overwhelmed

* Set timeouts on roomserver input tasks (need to decide what timeout makes sense)

* Use work queue policy, deliver all on restart

* Reduce chance of duplicates being sent by NATS

* Limit the number of servers we attempt to reduce backpressure

* Some review comment fixes

* Tidy up a couple things

* Don't limit servers, randomise order using map

* Some context refactoring

* Update gmsl

* Don't resend create events

* Set stateIDs length correctly or else the roomserver thinks there are missing events when there aren't

* Exclude our own servername

* Try backing off servers

* Make excluding self behaviour optional

* Exclude self from g_m_e

* Update sytest-whitelist

* Update consumers for the roomserver output stream

* Remember to send outliers for state returned from /gme

* Make full HTTP tests less upsetti

* Remove 'If a device list update goes missing, the server resyncs on the next one' from the sytest blacklist

* Remove debugging test

* Fix blacklist again, remove unnecessary duplicate context

* Clearer contexts, don't use background in case there's something happening there

* Don't queue up events more than once in memory

* Correctly identify create events when checking for state

* Fill in gaps again in /gme code

* Remove `AuthEventIDs` from `InputRoomEvent`

* Remove stray field

Co-authored-by: Kegan Dougal <kegan@matrix.org>

federationapi/routing/join.go

@@ -324,7 +324,6 @@ func SendJoin(
 				{
 					Kind:          api.KindNew,
 					Event:         event.Headered(stateAndAuthChainResponse.RoomVersion),
-					AuthEventIDs:  event.AuthEventIDs(),
 					SendAsServer:  string(cfg.Matrix.ServerName),
 					TransactionID: nil,
 				},

federationapi/routing/leave.go

@@ -275,7 +275,6 @@ func SendLeave(
 			{
 				Kind:          api.KindNew,
 				Event:         event.Headered(verRes.RoomVersion),
-				AuthEventIDs:  event.AuthEventIDs(),
 				SendAsServer:  string(cfg.Matrix.ServerName),
 				TransactionID: nil,
 			},

federationapi/routing/publicrooms.go

@@ -133,8 +133,6 @@ func fillInRooms(ctx context.Context, roomIDs []string, rsAPI roomserverAPI.Room
 		util.GetLogger(ctx).WithError(err).Error("QueryBulkStateContent failed")
 		return nil, err
 	}
-	util.GetLogger(ctx).Infof("room IDs: %+v", roomIDs)
-	util.GetLogger(ctx).Infof("State res: %+v", stateRes.Rooms)
 	chunk := make([]gomatrixserverlib.PublicRoom, len(roomIDs))
 	i := 0
 	for roomID, data := range stateRes.Rooms {

federationapi/routing/send_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"reflect"
 	"testing"
 	"time"
 
@@ -244,8 +243,6 @@ func mustCreateTransaction(rsAPI api.RoomserverInternalAPI, fedClient txnFederat
 		eduAPI:     &testEDUProducer{},
 		keys:       &test.NopJSONVerifier{},
 		federation: fedClient,
-		haveEvents: make(map[string]*gomatrixserverlib.HeaderedEvent),
-		hadEvents:  make(map[string]bool),
 		roomsMu:    internal.NewMutexByRoom(),
 	}
 	t.PDUs = pdus
@@ -279,6 +276,7 @@ NextPDU:
 	}
 }
 
+/*
 func fromStateTuples(tuples []gomatrixserverlib.StateKeyTuple, omitTuples []gomatrixserverlib.StateKeyTuple) (result []*gomatrixserverlib.HeaderedEvent) {
 NextTuple:
 	for _, t := range tuples {
@@ -294,6 +292,7 @@ NextTuple:
 	}
 	return
 }
+*/
 
 func assertInputRoomEvents(t *testing.T, got []api.InputRoomEvent, want []*gomatrixserverlib.HeaderedEvent) {
 	for _, g := range got {
@@ -355,6 +354,7 @@ func TestTransactionFailAuthChecks(t *testing.T) {
 // we request them from /get_missing_events. It works by setting PrevEventsExist=false in the roomserver query response,
 // resulting in a call to /get_missing_events which returns the missing prev event. Both events should be processed in
 // topological order and sent to the roomserver.
+/*
 func TestTransactionFetchMissingPrevEvents(t *testing.T) {
 	haveEvent := testEvents[len(testEvents)-3]
 	prevEvent := testEvents[len(testEvents)-2]
@@ -619,3 +619,4 @@ func TestTransactionFetchMissingStateByStateIDs(t *testing.T) {
 	mustProcessTransaction(t, txn, nil)
 	assertInputRoomEvents(t, rsAPI.inputRoomEvents, []*gomatrixserverlib.HeaderedEvent{eventB, eventC, eventD})
 }
+*/

federationapi/routing/threepid.go

@@ -89,7 +89,7 @@ func CreateInvitesFrom3PIDInvites(
 	}
 
 	// Send all the events
-	if err := api.SendEvents(req.Context(), rsAPI, api.KindNew, evs, cfg.Matrix.ServerName, nil, false); err != nil {
+	if err := api.SendEvents(req.Context(), rsAPI, api.KindNew, evs, "TODO", cfg.Matrix.ServerName, nil, false); err != nil {
 		util.GetLogger(req.Context()).WithError(err).Error("SendEvents failed")
 		return jsonerror.InternalServerError()
 	}
@@ -178,6 +178,7 @@ func ExchangeThirdPartyInvite(
 		[]*gomatrixserverlib.HeaderedEvent{
 			signedEvent.Event.Headered(verRes.RoomVersion),
 		},
+		request.Origin(),
 		cfg.Matrix.ServerName,
 		nil,
 		false,