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Roomserver API changes (#1118)

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* s/QueryBackfill/PerformBackfill/g

* OutputEvent now includes AddStateEvents which contain the full event of extra state events

* Only include adds not the current event

* Get adding state right
This commit is contained in:
Kegsay 2020-06-11 19:50:40 +01:00 committed by GitHub
parent 25cd2dd1c9
commit ec7718e7f8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
17 changed files with 152 additions and 287 deletions
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51
appservice/consumers/roomserver.go
View File

@ -91,60 +91,13 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
return nil
}
ev := output.NewRoomEvent.Event
log.WithFields(log.Fields{
"event_id": ev.EventID(),
"room_id": ev.RoomID(),
"type": ev.Type(),
}).Info("appservice received an event from roomserver")
missingEvents, err := s.lookupMissingStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev)
if err != nil {
return err
}
events := append(missingEvents, ev)
events := []gomatrixserverlib.HeaderedEvent{output.NewRoomEvent.Event}
events = append(events, output.NewRoomEvent.AddStateEvents...)
// Send event to any relevant application services
return s.filterRoomserverEvents(context.TODO(), events)
}
// lookupMissingStateEvents looks up the state events that are added by a new event,
// and returns any not already present.
func (s *OutputRoomEventConsumer) lookupMissingStateEvents(
addsStateEventIDs []string, event gomatrixserverlib.HeaderedEvent,
) ([]gomatrixserverlib.HeaderedEvent, error) {
// Fast path if there aren't any new state events.
if len(addsStateEventIDs) == 0 {
return []gomatrixserverlib.HeaderedEvent{}, nil
}
// Fast path if the only state event added is the event itself.
if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
return []gomatrixserverlib.HeaderedEvent{}, nil
}
result := []gomatrixserverlib.HeaderedEvent{}
missing := []string{}
for _, id := range addsStateEventIDs {
if id != event.EventID() {
// If the event isn't the current one, add it to the list of events
// to retrieve from the roomserver
missing = append(missing, id)
}
}
// Request the missing events from the roomserver
eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
var eventResp api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &eventReq, &eventResp); err != nil {
return nil, err
}
result = append(result, eventResp.Events...)
return result, nil
}
// filterRoomserverEvents takes in events and decides whether any of them need
// to be passed on to an external application service. It does this by checking
// each namespace of each registered application service, and if there is a

64
clientapi/consumers/roomserver.go
View File

@ -84,63 +84,9 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
return nil
}
ev := output.NewRoomEvent.Event
log.WithFields(log.Fields{
"event_id": ev.EventID(),
"room_id": ev.RoomID(),
"type": ev.Type(),
}).Info("received event from roomserver")
events, err := s.lookupStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev.Event)
if err != nil {
return err
}
return s.db.UpdateMemberships(context.TODO(), events, output.NewRoomEvent.RemovesStateEventIDs)
}
// lookupStateEvents looks up the state events that are added by a new event.
func (s *OutputRoomEventConsumer) lookupStateEvents(
addsStateEventIDs []string, event gomatrixserverlib.Event,
) ([]gomatrixserverlib.Event, error) {
// Fast path if there aren't any new state events.
if len(addsStateEventIDs) == 0 {
// If the event is a membership update (e.g. for a profile update), it won't
// show up in AddsStateEventIDs, so we need to add it manually
if event.Type() == "m.room.member" {
return []gomatrixserverlib.Event{event}, nil
}
return nil, nil
}
// Fast path if the only state event added is the event itself.
if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
return []gomatrixserverlib.Event{event}, nil
}
result := []gomatrixserverlib.Event{}
missing := []string{}
for _, id := range addsStateEventIDs {
// Append the current event in the results if its ID is in the events list
if id == event.EventID() {
result = append(result, event)
} else {
// If the event isn't the current one, add it to the list of events
// to retrieve from the roomserver
missing = append(missing, id)
}
}
// Request the missing events from the roomserver
eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
var eventResp api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &eventReq, &eventResp); err != nil {
return nil, err
}
for _, headeredEvent := range eventResp.Events {
result = append(result, headeredEvent.Event)
}
return result, nil
return s.db.UpdateMemberships(
context.TODO(),
gomatrixserverlib.UnwrapEventHeaders(output.NewRoomEvent.AddsState()),
output.NewRoomEvent.RemovesStateEventIDs,
)
}

8
federationapi/routing/backfill.go
View File

@ -37,7 +37,7 @@ func Backfill(
roomID string,
cfg *config.Dendrite,
) util.JSONResponse {
var res api.QueryBackfillResponse
var res api.PerformBackfillResponse
var eIDs []string
var limit string
var exists bool
@ -68,7 +68,7 @@ func Backfill(
}
// Populate the request.
req := api.QueryBackfillRequest{
req := api.PerformBackfillRequest{
RoomID: roomID,
// we don't know who the successors are for these events, which won't
// be a problem because we don't use that information when servicing /backfill requests,
@ -87,8 +87,8 @@ func Backfill(
}
// Query the roomserver.
if err = rsAPI.QueryBackfill(httpReq.Context(), &req, &res); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("query.QueryBackfill failed")
if err = rsAPI.PerformBackfill(httpReq.Context(), &req, &res); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("query.PerformBackfill failed")
return jsonerror.InternalServerError()
}

6
federationapi/routing/send_test.go
View File

@ -211,10 +211,10 @@ func (t *testRoomserverAPI) QueryStateAndAuthChain(
}
// Query a given amount (or less) of events prior to a given set of events.
func (t *testRoomserverAPI) QueryBackfill(
func (t *testRoomserverAPI) PerformBackfill(
ctx context.Context,
request *api.QueryBackfillRequest,
response *api.QueryBackfillResponse,
request *api.PerformBackfillRequest,
response *api.PerformBackfillResponse,
) error {
return fmt.Errorf("not implemented")
}

6
federationsender/consumers/roomserver.go
View File

@ -131,11 +131,7 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
// processMessage updates the list of currently joined hosts in the room
// and then sends the event to the hosts that were joined before the event.
func (s *OutputRoomEventConsumer) processMessage(ore api.OutputNewRoomEvent) error {
addsStateEvents, err := s.lookupStateEvents(ore.AddsStateEventIDs, ore.Event.Event)
if err != nil {
return err
}
addsJoinedHosts, err := joinedHostsFromEvents(addsStateEvents)
addsJoinedHosts, err := joinedHostsFromEvents(gomatrixserverlib.UnwrapEventHeaders(ore.AddsState()))
if err != nil {
return err
}

17
publicroomsapi/consumers/roomserver.go
View File

@ -78,20 +78,6 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
return nil
}
ev := output.NewRoomEvent.Event
log.WithFields(log.Fields{
"event_id": ev.EventID(),
"room_id": ev.RoomID(),
"type": ev.Type(),
}).Info("received event from roomserver")
addQueryReq := api.QueryEventsByIDRequest{EventIDs: output.NewRoomEvent.AddsStateEventIDs}
var addQueryRes api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &addQueryReq, &addQueryRes); err != nil {
log.Warn(err)
return err
}
remQueryReq := api.QueryEventsByIDRequest{EventIDs: output.NewRoomEvent.RemovesStateEventIDs}
var remQueryRes api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &remQueryReq, &remQueryRes); err != nil {
@ -100,9 +86,10 @@ func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
}
var addQueryEvents, remQueryEvents []gomatrixserverlib.Event
for _, headeredEvent := range addQueryRes.Events {
for _, headeredEvent := range output.NewRoomEvent.AddsState() {
addQueryEvents = append(addQueryEvents, headeredEvent.Event)
}
addQueryEvents = append(addQueryEvents, output.NewRoomEvent.Event.Unwrap())
for _, headeredEvent := range remQueryRes.Events {
remQueryEvents = append(remQueryEvents, headeredEvent.Event)
}

6
roomserver/api/api.go
View File

@ -89,10 +89,10 @@ type RoomserverInternalAPI interface {
) error
// Query a given amount (or less) of events prior to a given set of events.
QueryBackfill(
PerformBackfill(
ctx context.Context,
request *QueryBackfillRequest,
response *QueryBackfillResponse,
request *PerformBackfillRequest,
response *PerformBackfillResponse,
) error
// Asks for the default room version as preferred by the server.

27
roomserver/api/output.go
View File

@ -63,6 +63,13 @@ type OutputNewRoomEvent struct {
// Together with RemovesStateEventIDs this allows the receiver to keep an up to date
// view of the current state of the room.
AddsStateEventIDs []string `json:"adds_state_event_ids"`
// All extra newly added state events. This is only set if there are *extra* events
// other than `Event`. This can happen when forks get merged because state resolution
// may decide a bunch of state events on one branch are now valid, so they will be
// present in this list. This is useful when trying to maintain the current state of a room
// as to do so you need to include both these events and `Event`.
AddStateEvents []gomatrixserverlib.HeaderedEvent `json:"adds_state_events"`
// The state event IDs that were removed from the state of the room by this event.
RemovesStateEventIDs []string `json:"removes_state_event_ids"`
// The ID of the event that was output before this event.
@ -112,6 +119,26 @@ type OutputNewRoomEvent struct {
TransactionID *TransactionID `json:"transaction_id"`
}
// AddsState returns all added state events from this event.
//
// This function is needed because `AddStateEvents` will not include a copy of
// the original event to save space, so you cannot use that slice alone.
// Instead, use this function which will add the original event if it is present
// in `AddsStateEventIDs`.
func (ore *OutputNewRoomEvent) AddsState() []gomatrixserverlib.HeaderedEvent {
includeOutputEvent := false
for _, id := range ore.AddsStateEventIDs {
if id == ore.Event.EventID() {
includeOutputEvent = true
break
}
}
if !includeOutputEvent {
return ore.AddStateEvents
}
return append(ore.AddStateEvents, ore.Event)
}
// An OutputNewInviteEvent is written whenever an invite becomes active.
// Invite events can be received outside of an existing room so have to be
// tracked separately from the room events themselves.

29
roomserver/api/perform.go
View File

@ -2,6 +2,7 @@ package api
import (
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
type PerformJoinRequest struct {
@ -22,3 +23,31 @@ type PerformLeaveRequest struct {
type PerformLeaveResponse struct {
}
// PerformBackfillRequest is a request to PerformBackfill.
type PerformBackfillRequest struct {
// The room to backfill
RoomID string `json:"room_id"`
// A map of backwards extremity event ID to a list of its prev_event IDs.
BackwardsExtremities map[string][]string `json:"backwards_extremities"`
// The maximum number of events to retrieve.
Limit int `json:"limit"`
// The server interested in the events.
ServerName gomatrixserverlib.ServerName `json:"server_name"`
}
// PrevEventIDs returns the prev_event IDs of all backwards extremities, de-duplicated in a lexicographically sorted order.
func (r *PerformBackfillRequest) PrevEventIDs() []string {
var prevEventIDs []string
for _, pes := range r.BackwardsExtremities {
prevEventIDs = append(prevEventIDs, pes...)
}
prevEventIDs = util.UniqueStrings(prevEventIDs)
return prevEventIDs
}
// PerformBackfillResponse is a response to PerformBackfill.
type PerformBackfillResponse struct {
// Missing events, arbritrary order.
Events []gomatrixserverlib.HeaderedEvent `json:"events"`
}

29
roomserver/api/query.go
View File

@ -18,7 +18,6 @@ package api
import (
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// QueryLatestEventsAndStateRequest is a request to QueryLatestEventsAndState
@ -204,34 +203,6 @@ type QueryStateAndAuthChainResponse struct {
AuthChainEvents []gomatrixserverlib.HeaderedEvent `json:"auth_chain_events"`
}
// QueryBackfillRequest is a request to QueryBackfill.
type QueryBackfillRequest struct {
// The room to backfill
RoomID string `json:"room_id"`
// A map of backwards extremity event ID to a list of its prev_event IDs.
BackwardsExtremities map[string][]string `json:"backwards_extremities"`
// The maximum number of events to retrieve.
Limit int `json:"limit"`
// The server interested in the events.
ServerName gomatrixserverlib.ServerName `json:"server_name"`
}
// PrevEventIDs returns the prev_event IDs of all backwards extremities, de-duplicated in a lexicographically sorted order.
func (r *QueryBackfillRequest) PrevEventIDs() []string {
var prevEventIDs []string
for _, pes := range r.BackwardsExtremities {
prevEventIDs = append(prevEventIDs, pes...)
}
prevEventIDs = util.UniqueStrings(prevEventIDs)
return prevEventIDs
}
// QueryBackfillResponse is a response to QueryBackfill.
type QueryBackfillResponse struct {
// Missing events, arbritrary order.
Events []gomatrixserverlib.HeaderedEvent `json:"events"`
}
// QueryRoomVersionCapabilitiesRequest asks for the default room version
type QueryRoomVersionCapabilitiesRequest struct{}

66
roomserver/internal/input_latest_events.go
View File

@ -19,6 +19,7 @@ package internal
import (
"bytes"
"context"
"fmt"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/roomserver/api"
@ -310,24 +311,11 @@ func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error)
TransactionID: u.transactionID,
}
var stateEventNIDs []types.EventNID
for _, entry := range u.added {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range u.removed {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range u.stateBeforeEventRemoves {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range u.stateBeforeEventAdds {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
stateEventNIDs = stateEventNIDs[:util.SortAndUnique(eventNIDSorter(stateEventNIDs))]
eventIDMap, err := u.api.DB.EventIDs(u.ctx, stateEventNIDs)
eventIDMap, err := u.stateEventMap()
if err != nil {
return nil, err
}
for _, entry := range u.added {
ore.AddsStateEventIDs = append(ore.AddsStateEventIDs, eventIDMap[entry.EventNID])
}
@ -342,12 +330,60 @@ func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error)
}
ore.SendAsServer = u.sendAsServer
// include extra state events if they were added as nearly every downstream component will care about it
// and we'd rather not have them all hit QueryEventsByID at the same time!
if len(ore.AddsStateEventIDs) > 0 {
ore.AddStateEvents, err = u.extraEventsForIDs(roomVersion, ore.AddsStateEventIDs)
if err != nil {
return nil, fmt.Errorf("failed to load add_state_events from db: %w", err)
}
}
return &api.OutputEvent{
Type: api.OutputTypeNewRoomEvent,
NewRoomEvent: &ore,
}, nil
}
// extraEventsForIDs returns the full events for the event IDs given, but does not include the current event being
// updated.
func (u *latestEventsUpdater) extraEventsForIDs(roomVersion gomatrixserverlib.RoomVersion, eventIDs []string) ([]gomatrixserverlib.HeaderedEvent, error) {
var extraEventIDs []string
for _, e := range eventIDs {
if e == u.event.EventID() {
continue
}
extraEventIDs = append(extraEventIDs, e)
}
if len(extraEventIDs) == 0 {
return nil, nil
}
extraEvents, err := u.api.DB.EventsFromIDs(u.ctx, extraEventIDs)
if err != nil {
return nil, err
}
var h []gomatrixserverlib.HeaderedEvent
for _, e := range extraEvents {
h = append(h, e.Headered(roomVersion))
}
return h, nil
}
// retrieve an event nid -> event ID map for all events that need updating
func (u *latestEventsUpdater) stateEventMap() (map[types.EventNID]string, error) {
var stateEventNIDs []types.EventNID
var allStateEntries []types.StateEntry
allStateEntries = append(allStateEntries, u.added...)
allStateEntries = append(allStateEntries, u.removed...)
allStateEntries = append(allStateEntries, u.stateBeforeEventRemoves...)
allStateEntries = append(allStateEntries, u.stateBeforeEventAdds...)
for _, entry := range allStateEntries {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
stateEventNIDs = stateEventNIDs[:util.SortAndUnique(eventNIDSorter(stateEventNIDs))]
return u.api.DB.EventIDs(u.ctx, stateEventNIDs)
}
type eventNIDSorter []types.EventNID
func (s eventNIDSorter) Len() int { return len(s) }

0
roomserver/internal/query_backfill.go → roomserver/internal/perform_backfill.go
View File

12
roomserver/internal/query.go
View File

@ -441,11 +441,11 @@ func (r *RoomserverInternalAPI) QueryMissingEvents(
return err
}
// QueryBackfill implements api.RoomServerQueryAPI
func (r *RoomserverInternalAPI) QueryBackfill(
// PerformBackfill implements api.RoomServerQueryAPI
func (r *RoomserverInternalAPI) PerformBackfill(
ctx context.Context,
request *api.QueryBackfillRequest,
response *api.QueryBackfillResponse,
request *api.PerformBackfillRequest,
response *api.PerformBackfillResponse,
) error {
// if we are requesting the backfill then we need to do a federation hit
// TODO: we could be more sensible and fetch as many events we already have then request the rest
@ -489,7 +489,7 @@ func (r *RoomserverInternalAPI) QueryBackfill(
return err
}
func (r *RoomserverInternalAPI) backfillViaFederation(ctx context.Context, req *api.QueryBackfillRequest, res *api.QueryBackfillResponse) error {
func (r *RoomserverInternalAPI) backfillViaFederation(ctx context.Context, req *api.PerformBackfillRequest, res *api.PerformBackfillResponse) error {
roomVer, err := r.DB.GetRoomVersionForRoom(ctx, req.RoomID)
if err != nil {
return fmt.Errorf("backfillViaFederation: unknown room version for room %s : %w", req.RoomID, err)
@ -647,7 +647,7 @@ func (r *RoomserverInternalAPI) scanEventTree(
var pre string
// TODO: add tests for this function to ensure it meets the contract that callers expect (and doc what that is supposed to be)
// Currently, callers like QueryBackfill will call scanEventTree with a pre-populated `visited` map, assuming that by doing
// Currently, callers like PerformBackfill will call scanEventTree with a pre-populated `visited` map, assuming that by doing
// so means that the events in that map will NOT be returned from this function. That is not currently true, resulting in
// duplicate events being sent in response to /backfill requests.
initialIgnoreList := make(map[string]bool, len(visited))

18
roomserver/inthttp/client.go
View File

@ -24,8 +24,9 @@ const (
RoomserverInputRoomEventsPath = "/roomserver/inputRoomEvents"
// Perform operations
RoomserverPerformJoinPath = "/roomserver/performJoin"
RoomserverPerformLeavePath = "/roomserver/performLeave"
RoomserverPerformJoinPath = "/roomserver/performJoin"
RoomserverPerformLeavePath = "/roomserver/performLeave"
RoomserverPerformBackfillPath = "/roomserver/performBackfill"
// Query operations
RoomserverQueryLatestEventsAndStatePath = "/roomserver/queryLatestEventsAndState"
@ -36,7 +37,6 @@ const (
RoomserverQueryServerAllowedToSeeEventPath = "/roomserver/queryServerAllowedToSeeEvent"
RoomserverQueryMissingEventsPath = "/roomserver/queryMissingEvents"
RoomserverQueryStateAndAuthChainPath = "/roomserver/queryStateAndAuthChain"
RoomserverQueryBackfillPath = "/roomserver/queryBackfill"
RoomserverQueryRoomVersionCapabilitiesPath = "/roomserver/queryRoomVersionCapabilities"
RoomserverQueryRoomVersionForRoomPath = "/roomserver/queryRoomVersionForRoom"
)
@ -274,16 +274,16 @@ func (h *httpRoomserverInternalAPI) QueryStateAndAuthChain(
return internalHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
}
// QueryBackfill implements RoomServerQueryAPI
func (h *httpRoomserverInternalAPI) QueryBackfill(
// PerformBackfill implements RoomServerQueryAPI
func (h *httpRoomserverInternalAPI) PerformBackfill(
ctx context.Context,
request *api.QueryBackfillRequest,
response *api.QueryBackfillResponse,
request *api.PerformBackfillRequest,
response *api.PerformBackfillResponse,
) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "QueryBackfill")
span, ctx := opentracing.StartSpanFromContext(ctx, "PerformBackfill")
defer span.Finish()
apiURL := h.roomserverURL + RoomserverQueryBackfillPath
apiURL := h.roomserverURL + RoomserverPerformBackfillPath
return internalHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
}

10
roomserver/inthttp/server.go
View File

@ -165,14 +165,14 @@ func AddRoutes(r api.RoomserverInternalAPI, internalAPIMux *mux.Router) {
}),
)
internalAPIMux.Handle(
RoomserverQueryBackfillPath,
internal.MakeInternalAPI("QueryBackfill", func(req *http.Request) util.JSONResponse {
var request api.QueryBackfillRequest
var response api.QueryBackfillResponse
RoomserverPerformBackfillPath,
internal.MakeInternalAPI("PerformBackfill", func(req *http.Request) util.JSONResponse {
var request api.PerformBackfillRequest
var response api.PerformBackfillResponse
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
return util.ErrorResponse(err)
}
if err := r.QueryBackfill(req.Context(), &request, &response); err != nil {
if err := r.PerformBackfill(req.Context(), &request, &response); err != nil {
return util.ErrorResponse(err)
}
return util.JSONResponse{Code: http.StatusOK, JSON: &response}

84
syncapi/consumers/roomserver.go
View File

@ -17,7 +17,6 @@ package consumers
import (
"context"
"encoding/json"
"fmt"
"github.com/Shopify/sarama"
"github.com/matrix-org/dendrite/internal"
@ -105,17 +104,9 @@ func (s *OutputRoomEventConsumer) onNewRoomEvent(
"room_version": ev.RoomVersion,
}).Info("received event from roomserver")
addsStateEvents, err := s.lookupStateEvents(msg.AddsStateEventIDs, ev)
if err != nil {
log.WithFields(log.Fields{
"event": string(ev.JSON()),
log.ErrorKey: err,
"add": msg.AddsStateEventIDs,
"del": msg.RemovesStateEventIDs,
}).Panicf("roomserver output log: state event lookup failure")
}
addsStateEvents := msg.AddsState()
ev, err = s.updateStateEvent(ev)
ev, err := s.updateStateEvent(ev)
if err != nil {
return err
}
@ -185,63 +176,6 @@ func (s *OutputRoomEventConsumer) onRetireInviteEvent(
return nil
}
// lookupStateEvents looks up the state events that are added by a new event.
func (s *OutputRoomEventConsumer) lookupStateEvents(
addsStateEventIDs []string, event gomatrixserverlib.HeaderedEvent,
) ([]gomatrixserverlib.HeaderedEvent, error) {
// Fast path if there aren't any new state events.
if len(addsStateEventIDs) == 0 {
return nil, nil
}
// Fast path if the only state event added is the event itself.
if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
return []gomatrixserverlib.HeaderedEvent{event}, nil
}
// Check if this is re-adding a state events that we previously processed
// If we have previously received a state event it may still be in
// our event database.
result, err := s.db.Events(context.TODO(), addsStateEventIDs)
if err != nil {
return nil, err
}
missing := missingEventsFrom(result, addsStateEventIDs)
// Check if event itself is being added.
for _, eventID := range missing {
if eventID == event.EventID() {
result = append(result, event)
break
}
}
missing = missingEventsFrom(result, addsStateEventIDs)
if len(missing) == 0 {
return result, nil
}
// At this point the missing events are neither the event itself nor are
// they present in our local database. Our only option is to fetch them
// from the roomserver using the query API.
eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
var eventResp api.QueryEventsByIDResponse
if err := s.rsAPI.QueryEventsByID(context.TODO(), &eventReq, &eventResp); err != nil {
return nil, err
}
result = append(result, eventResp.Events...)
missing = missingEventsFrom(result, addsStateEventIDs)
if len(missing) != 0 {
return nil, fmt.Errorf(
"missing %d state events IDs at event %q", len(missing), event.EventID(),
)
}
return result, nil
}
func (s *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
var stateKey string
if event.StateKey() == nil {
@ -270,17 +204,3 @@ func (s *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.Heade
event.Event, err = event.SetUnsigned(prev)
return event, err
}
func missingEventsFrom(events []gomatrixserverlib.HeaderedEvent, required []string) []string {
have := map[string]bool{}
for _, event := range events {
have[event.EventID()] = true
}
var missing []string
for _, eventID := range required {
if !have[eventID] {
missing = append(missing, eventID)
}
}
return missing
}

6
syncapi/routing/messages.go
View File

@ -375,15 +375,15 @@ func (e eventsByDepth) Less(i, j int) bool {
// Returns an error if there was an issue with retrieving the list of servers in
// the room or sending the request.
func (r *messagesReq) backfill(roomID string, backwardsExtremities map[string][]string, limit int) ([]gomatrixserverlib.HeaderedEvent, error) {
var res api.QueryBackfillResponse
err := r.rsAPI.QueryBackfill(context.Background(), &api.QueryBackfillRequest{
var res api.PerformBackfillResponse
err := r.rsAPI.PerformBackfill(context.Background(), &api.PerformBackfillRequest{
RoomID: roomID,
BackwardsExtremities: backwardsExtremities,
Limit: limit,
ServerName: r.cfg.Matrix.ServerName,
}, &res)
if err != nil {
return nil, fmt.Errorf("QueryBackfill failed: %w", err)
return nil, fmt.Errorf("PerformBackfill failed: %w", err)
}
util.GetLogger(r.ctx).WithField("new_events", len(res.Events)).Info("Storing new events from backfill")