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Protect processEventWithMissingState with per-room mutex, to prevent mass CPU burn/RAM usage

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Squashed commit of the following:

commit 7fad77c10e3c1c78feddb37351812b209d9c0f25
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 15:06:52 2021 +0100

    Fix processEventWithMissingStateMutexes

commit 138cddcac7b8373a8e1816a232f84a7bda6adcdf
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:59:44 2021 +0100

    Use internal.MutexByRoom

commit 6e6f026cfad31da391ad261cfec16d41dff1b15b
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:50:18 2021 +0100

    Try to slow things down per room

commit b97d406dff2e11769a9202fbf58b138a541ca449
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:41:27 2021 +0100

    Try to slow things down

commit 8866120ebf880b4fd8a456937f69903e233c19a2
Merge: 9f2de8a2 4a37b19a
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:40:33 2021 +0100

    Merge branch 'neilalexander/rsinputfifo' into neilalexander/rsinputfifo2

commit 4a37b19a8f6fe8af02e979827253d22a0ccdedb8
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:34:54 2021 +0100

    Add comments

commit f9ab3f4b8157a42d657735101bc2c768c663e814
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:31:21 2021 +0100

    Tweaks

commit 9f2de8a29cadec4c785d9c2e4e74c1138305f759
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 13:15:59 2021 +0100

    Ask origin only for missing things for now

commit 8fd878c75a4066abb21597d524a4eb4670a392d4
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 11:18:11 2021 +0100

    Make sure someone wakes up

commit b63f699f1b74948d180885449398f999fafb18c8
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jun 28 11:12:58 2021 +0100

    Use a FIFO queue instead of a channel to reduce backpressure
This commit is contained in:
Neil Alexander 2021-06-28 15:11:59 +01:00
parent 7c3991ee2f
commit 4417f24678
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1 changed files with 16 additions and 9 deletions
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25
federationapi/routing/send.go
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@ -486,14 +486,16 @@ func (t *txnReq) getServers(ctx context.Context, roomID string) []gomatrixserver
return t.servers return t.servers
} }
t.servers = []gomatrixserverlib.ServerName{t.Origin} t.servers = []gomatrixserverlib.ServerName{t.Origin}
serverReq := &api.QueryServerJoinedToRoomRequest{ /*
RoomID: roomID, serverReq := &api.QueryServerJoinedToRoomRequest{
} RoomID: roomID,
serverRes := &api.QueryServerJoinedToRoomResponse{} }
if err := t.rsAPI.QueryServerJoinedToRoom(ctx, serverReq, serverRes); err == nil { serverRes := &api.QueryServerJoinedToRoomResponse{}
t.servers = append(t.servers, serverRes.ServerNames...) if err := t.rsAPI.QueryServerJoinedToRoom(ctx, serverReq, serverRes); err == nil {
util.GetLogger(ctx).Infof("Found %d server(s) to query for missing events in %q", len(t.servers), roomID) t.servers = append(t.servers, serverRes.ServerNames...)
} util.GetLogger(ctx).Infof("Found %d server(s) to query for missing events in %q", len(t.servers), roomID)
}
*/
return t.servers return t.servers
} }
@ -618,13 +620,18 @@ func checkAllowedByState(e *gomatrixserverlib.Event, stateEvents []*gomatrixserv
return gomatrixserverlib.Allowed(e, &authUsingState) return gomatrixserverlib.Allowed(e, &authUsingState)
} }
var processEventWithMissingStateMutexes = internal.NewMutexByRoom()
func (t *txnReq) processEventWithMissingState( func (t *txnReq) processEventWithMissingState(
ctx context.Context, e *gomatrixserverlib.Event, roomVersion gomatrixserverlib.RoomVersion, ctx context.Context, e *gomatrixserverlib.Event, roomVersion gomatrixserverlib.RoomVersion,
) error { ) error {
processEventWithMissingStateMutexes.Lock(e.RoomID())
defer processEventWithMissingStateMutexes.Unlock(e.RoomID())
// Do this with a fresh context, so that we keep working even if the // Do this with a fresh context, so that we keep working even if the
// original request times out. With any luck, by the time the remote // original request times out. With any luck, by the time the remote
// side retries, we'll have fetched the missing state. // side retries, we'll have fetched the missing state.
gmectx, cancel := context.WithTimeout(context.Background(), time.Minute*5) gmectx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel() defer cancel()
// We are missing the previous events for this events. // We are missing the previous events for this events.
// This means that there is a gap in our view of the history of the // This means that there is a gap in our view of the history of the