e473320e73
- New package `perform` which contains all `Perform` functions - New package `helpers` which contains helper functions used by both perform and query/input functions. - Perform invite/leave have no idea how to `WriteOutputEvents` and this is now returned from `PerformInvite` or `PerformLeave` respectively. Still to do: - RSAPI is fed into the inviter/joiner/leaver - this introduces circular logic so will need to be removed. - Put query operations in a `query` package. - Put input operations (and output) in an `input` package. - Factor out helper functions as much as possible, possibly rejigging the storage layer in the process.
548 lines
20 KiB
Go
548 lines
20 KiB
Go
package perform
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import (
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"context"
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"fmt"
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"github.com/matrix-org/dendrite/internal/eventutil"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/auth"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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type Backfiller struct {
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ServerName gomatrixserverlib.ServerName
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DB storage.Database
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FedClient *gomatrixserverlib.FederationClient
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KeyRing gomatrixserverlib.JSONVerifier
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}
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// PerformBackfill implements api.RoomServerQueryAPI
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func (r *Backfiller) PerformBackfill(
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ctx context.Context,
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request *api.PerformBackfillRequest,
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response *api.PerformBackfillResponse,
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) error {
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// if we are requesting the backfill then we need to do a federation hit
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// TODO: we could be more sensible and fetch as many events we already have then request the rest
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// which is what the syncapi does already.
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if request.ServerName == r.ServerName {
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return r.backfillViaFederation(ctx, request, response)
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}
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// someone else is requesting the backfill, try to service their request.
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var err error
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var front []string
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// The limit defines the maximum number of events to retrieve, so it also
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// defines the highest number of elements in the map below.
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visited := make(map[string]bool, request.Limit)
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// this will include these events which is what we want
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front = request.PrevEventIDs()
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info, err := r.DB.RoomInfo(ctx, request.RoomID)
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if err != nil {
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return err
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}
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if info == nil || info.IsStub {
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return fmt.Errorf("PerformBackfill: missing room info for room %s", request.RoomID)
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}
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// Scan the event tree for events to send back.
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resultNIDs, err := helpers.ScanEventTree(ctx, r.DB, *info, front, visited, request.Limit, request.ServerName)
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if err != nil {
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return err
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}
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// Retrieve events from the list that was filled previously.
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var loadedEvents []gomatrixserverlib.Event
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loadedEvents, err = helpers.LoadEvents(ctx, r.DB, resultNIDs)
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if err != nil {
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return err
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}
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for _, event := range loadedEvents {
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response.Events = append(response.Events, event.Headered(info.RoomVersion))
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}
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return err
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}
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func (r *Backfiller) backfillViaFederation(ctx context.Context, req *api.PerformBackfillRequest, res *api.PerformBackfillResponse) error {
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info, err := r.DB.RoomInfo(ctx, req.RoomID)
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if err != nil {
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return err
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}
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if info == nil || info.IsStub {
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return fmt.Errorf("backfillViaFederation: missing room info for room %s", req.RoomID)
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}
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requester := newBackfillRequester(r.DB, r.FedClient, r.ServerName, req.BackwardsExtremities)
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// Request 100 items regardless of what the query asks for.
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// We don't want to go much higher than this.
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// We can't honour exactly the limit as some sytests rely on requesting more for tests to pass
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// (so we don't need to hit /state_ids which the test has no listener for)
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// Specifically the test "Outbound federation can backfill events"
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events, err := gomatrixserverlib.RequestBackfill(
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ctx, requester,
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r.KeyRing, req.RoomID, info.RoomVersion, req.PrevEventIDs(), 100)
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if err != nil {
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return err
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}
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logrus.WithField("room_id", req.RoomID).Infof("backfilled %d events", len(events))
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// persist these new events - auth checks have already been done
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roomNID, backfilledEventMap := persistEvents(ctx, r.DB, events)
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if err != nil {
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return err
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}
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for _, ev := range backfilledEventMap {
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// now add state for these events
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stateIDs, ok := requester.eventIDToBeforeStateIDs[ev.EventID()]
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if !ok {
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// this should be impossible as all events returned must have pass Step 5 of the PDU checks
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// which requires a list of state IDs.
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logrus.WithError(err).WithField("event_id", ev.EventID()).Error("backfillViaFederation: failed to find state IDs for event which passed auth checks")
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continue
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}
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var entries []types.StateEntry
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if entries, err = r.DB.StateEntriesForEventIDs(ctx, stateIDs); err != nil {
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// attempt to fetch the missing events
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r.fetchAndStoreMissingEvents(ctx, info.RoomVersion, requester, stateIDs)
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// try again
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entries, err = r.DB.StateEntriesForEventIDs(ctx, stateIDs)
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if err != nil {
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logrus.WithError(err).WithField("event_id", ev.EventID()).Error("backfillViaFederation: failed to get state entries for event")
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return err
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}
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}
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var beforeStateSnapshotNID types.StateSnapshotNID
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if beforeStateSnapshotNID, err = r.DB.AddState(ctx, roomNID, nil, entries); err != nil {
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logrus.WithError(err).WithField("event_id", ev.EventID()).Error("backfillViaFederation: failed to persist state entries to get snapshot nid")
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return err
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}
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if err = r.DB.SetState(ctx, ev.EventNID, beforeStateSnapshotNID); err != nil {
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logrus.WithError(err).WithField("event_id", ev.EventID()).Error("backfillViaFederation: failed to persist snapshot nid")
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}
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}
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// TODO: update backwards extremities, as that should be moved from syncapi to roomserver at some point.
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res.Events = events
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return nil
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}
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// fetchAndStoreMissingEvents does a best-effort fetch and store of missing events specified in stateIDs. Returns no error as it is just
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// best effort.
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func (r *Backfiller) fetchAndStoreMissingEvents(ctx context.Context, roomVer gomatrixserverlib.RoomVersion,
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backfillRequester *backfillRequester, stateIDs []string) {
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servers := backfillRequester.servers
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// work out which are missing
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nidMap, err := r.DB.EventNIDs(ctx, stateIDs)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Warn("cannot query missing events")
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return
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}
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missingMap := make(map[string]*gomatrixserverlib.HeaderedEvent) // id -> event
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for _, id := range stateIDs {
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if _, ok := nidMap[id]; !ok {
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missingMap[id] = nil
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}
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}
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util.GetLogger(ctx).Infof("Fetching %d missing state events (from %d possible servers)", len(missingMap), len(servers))
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// fetch the events from federation. Loop the servers first so if we find one that works we stick with them
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for _, srv := range servers {
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for id, ev := range missingMap {
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if ev != nil {
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continue // already found
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}
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logger := util.GetLogger(ctx).WithField("server", srv).WithField("event_id", id)
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res, err := r.FedClient.GetEvent(ctx, srv, id)
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if err != nil {
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logger.WithError(err).Warn("failed to get event from server")
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continue
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}
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loader := gomatrixserverlib.NewEventsLoader(roomVer, r.KeyRing, backfillRequester, backfillRequester.ProvideEvents, false)
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result, err := loader.LoadAndVerify(ctx, res.PDUs, gomatrixserverlib.TopologicalOrderByPrevEvents)
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if err != nil {
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logger.WithError(err).Warn("failed to load and verify event")
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continue
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}
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logger.Infof("returned %d PDUs which made events %+v", len(res.PDUs), result)
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for _, res := range result {
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if res.Error != nil {
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logger.WithError(err).Warn("event failed PDU checks")
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continue
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}
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missingMap[id] = res.Event
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}
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}
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}
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var newEvents []gomatrixserverlib.HeaderedEvent
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for _, ev := range missingMap {
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if ev != nil {
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newEvents = append(newEvents, *ev)
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}
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}
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util.GetLogger(ctx).Infof("Persisting %d new events", len(newEvents))
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persistEvents(ctx, r.DB, newEvents)
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}
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// backfillRequester implements gomatrixserverlib.BackfillRequester
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type backfillRequester struct {
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db storage.Database
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fedClient *gomatrixserverlib.FederationClient
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thisServer gomatrixserverlib.ServerName
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bwExtrems map[string][]string
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// per-request state
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servers []gomatrixserverlib.ServerName
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eventIDToBeforeStateIDs map[string][]string
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eventIDMap map[string]gomatrixserverlib.Event
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}
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func newBackfillRequester(db storage.Database, fedClient *gomatrixserverlib.FederationClient, thisServer gomatrixserverlib.ServerName, bwExtrems map[string][]string) *backfillRequester {
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return &backfillRequester{
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db: db,
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fedClient: fedClient,
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thisServer: thisServer,
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eventIDToBeforeStateIDs: make(map[string][]string),
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eventIDMap: make(map[string]gomatrixserverlib.Event),
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bwExtrems: bwExtrems,
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}
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}
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func (b *backfillRequester) StateIDsBeforeEvent(ctx context.Context, targetEvent gomatrixserverlib.HeaderedEvent) ([]string, error) {
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b.eventIDMap[targetEvent.EventID()] = targetEvent.Unwrap()
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if ids, ok := b.eventIDToBeforeStateIDs[targetEvent.EventID()]; ok {
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return ids, nil
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}
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if len(targetEvent.PrevEventIDs()) == 0 && targetEvent.Type() == "m.room.create" && targetEvent.StateKeyEquals("") {
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util.GetLogger(ctx).WithField("room_id", targetEvent.RoomID()).Info("Backfilled to the beginning of the room")
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b.eventIDToBeforeStateIDs[targetEvent.EventID()] = []string{}
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return nil, nil
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}
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// if we have exactly 1 prev event and we know the state of the room at that prev event, then just roll forward the prev event.
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// Else, we have to hit /state_ids because either we don't know the state at all at this event (new backwards extremity) or
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// we don't know the result of state res to merge forks (2 or more prev_events)
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if len(targetEvent.PrevEventIDs()) == 1 {
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prevEventID := targetEvent.PrevEventIDs()[0]
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prevEvent, ok := b.eventIDMap[prevEventID]
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if !ok {
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goto FederationHit
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}
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prevEventStateIDs, ok := b.eventIDToBeforeStateIDs[prevEventID]
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if !ok {
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goto FederationHit
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}
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newStateIDs := b.calculateNewStateIDs(targetEvent.Unwrap(), prevEvent, prevEventStateIDs)
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if newStateIDs != nil {
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b.eventIDToBeforeStateIDs[targetEvent.EventID()] = newStateIDs
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return newStateIDs, nil
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}
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// else we failed to calculate the new state, so fallthrough
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}
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FederationHit:
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var lastErr error
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logrus.WithField("event_id", targetEvent.EventID()).Info("Requesting /state_ids at event")
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for _, srv := range b.servers { // hit any valid server
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c := gomatrixserverlib.FederatedStateProvider{
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FedClient: b.fedClient,
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RememberAuthEvents: false,
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Server: srv,
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}
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res, err := c.StateIDsBeforeEvent(ctx, targetEvent)
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if err != nil {
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lastErr = err
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continue
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}
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b.eventIDToBeforeStateIDs[targetEvent.EventID()] = res
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return res, nil
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}
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return nil, lastErr
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}
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func (b *backfillRequester) calculateNewStateIDs(targetEvent, prevEvent gomatrixserverlib.Event, prevEventStateIDs []string) []string {
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newStateIDs := prevEventStateIDs[:]
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if prevEvent.StateKey() == nil {
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// state is the same as the previous event
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b.eventIDToBeforeStateIDs[targetEvent.EventID()] = newStateIDs
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return newStateIDs
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}
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missingState := false // true if we are missing the info for a state event ID
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foundEvent := false // true if we found a (type, state_key) match
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// find which state ID to replace, if any
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for i, id := range newStateIDs {
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ev, ok := b.eventIDMap[id]
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if !ok {
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missingState = true
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continue
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}
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// The state IDs BEFORE the target event are the state IDs BEFORE the prev_event PLUS the prev_event itself
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if ev.Type() == prevEvent.Type() && ev.StateKeyEquals(*prevEvent.StateKey()) {
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newStateIDs[i] = prevEvent.EventID()
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foundEvent = true
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break
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}
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}
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if !foundEvent && !missingState {
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// we can be certain that this is new state
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newStateIDs = append(newStateIDs, prevEvent.EventID())
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foundEvent = true
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}
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if foundEvent {
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b.eventIDToBeforeStateIDs[targetEvent.EventID()] = newStateIDs
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return newStateIDs
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}
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return nil
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}
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func (b *backfillRequester) StateBeforeEvent(ctx context.Context, roomVer gomatrixserverlib.RoomVersion,
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event gomatrixserverlib.HeaderedEvent, eventIDs []string) (map[string]*gomatrixserverlib.Event, error) {
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// try to fetch the events from the database first
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events, err := b.ProvideEvents(roomVer, eventIDs)
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if err != nil {
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// non-fatal, fallthrough
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logrus.WithError(err).Info("Failed to fetch events")
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} else {
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logrus.Infof("Fetched %d/%d events from the database", len(events), len(eventIDs))
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if len(events) == len(eventIDs) {
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result := make(map[string]*gomatrixserverlib.Event)
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for i := range events {
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result[events[i].EventID()] = &events[i]
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b.eventIDMap[events[i].EventID()] = events[i]
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}
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return result, nil
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}
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}
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c := gomatrixserverlib.FederatedStateProvider{
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FedClient: b.fedClient,
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RememberAuthEvents: false,
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Server: b.servers[0],
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}
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result, err := c.StateBeforeEvent(ctx, roomVer, event, eventIDs)
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if err != nil {
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return nil, err
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}
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for eventID, ev := range result {
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b.eventIDMap[eventID] = *ev
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}
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return result, nil
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}
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// ServersAtEvent is called when trying to determine which server to request from.
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// It returns a list of servers which can be queried for backfill requests. These servers
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// will be servers that are in the room already. The entries at the beginning are preferred servers
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// and will be tried first. An empty list will fail the request.
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// nolint:gocyclo
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func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID string) []gomatrixserverlib.ServerName {
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// eventID will be a prev_event ID of a backwards extremity, meaning we will not have a database entry for it. Instead, use
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// its successor, so look it up.
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successor := ""
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FindSuccessor:
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for sucID, prevEventIDs := range b.bwExtrems {
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for _, pe := range prevEventIDs {
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if pe == eventID {
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successor = sucID
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break FindSuccessor
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}
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}
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}
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if successor == "" {
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logrus.WithField("event_id", eventID).Error("ServersAtEvent: failed to find successor of this event to determine room state")
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return nil
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}
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eventID = successor
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// getMembershipsBeforeEventNID requires a NID, so retrieving the NID for
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// the event is necessary.
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NIDs, err := b.db.EventNIDs(ctx, []string{eventID})
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if err != nil {
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logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to get event NID for event")
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return nil
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}
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info, err := b.db.RoomInfo(ctx, roomID)
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if err != nil {
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logrus.WithError(err).WithField("room_id", roomID).Error("ServersAtEvent: failed to get RoomInfo for room")
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return nil
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}
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if info == nil || info.IsStub {
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logrus.WithField("room_id", roomID).Error("ServersAtEvent: failed to get RoomInfo for room, room is missing")
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return nil
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}
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stateEntries, err := helpers.StateBeforeEvent(ctx, b.db, *info, NIDs[eventID])
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if err != nil {
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logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to load state before event")
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return nil
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}
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// possibly return all joined servers depending on history visiblity
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memberEventsFromVis, err := joinEventsFromHistoryVisibility(ctx, b.db, roomID, stateEntries)
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if err != nil {
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logrus.WithError(err).Error("ServersAtEvent: failed calculate servers from history visibility rules")
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return nil
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}
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logrus.Infof("ServersAtEvent including %d current events from history visibility", len(memberEventsFromVis))
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// Retrieve all "m.room.member" state events of "join" membership, which
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// contains the list of users in the room before the event, therefore all
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// the servers in it at that moment.
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memberEvents, err := helpers.GetMembershipsAtState(ctx, b.db, stateEntries, true)
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if err != nil {
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logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to get memberships before event")
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return nil
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}
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memberEvents = append(memberEvents, memberEventsFromVis...)
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// Store the server names in a temporary map to avoid duplicates.
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serverSet := make(map[gomatrixserverlib.ServerName]bool)
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for _, event := range memberEvents {
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serverSet[event.Origin()] = true
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}
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var servers []gomatrixserverlib.ServerName
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for server := range serverSet {
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if server == b.thisServer {
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continue
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}
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servers = append(servers, server)
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}
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b.servers = servers
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return servers
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}
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// Backfill performs a backfill request to the given server.
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// https://matrix.org/docs/spec/server_server/latest#get-matrix-federation-v1-backfill-roomid
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func (b *backfillRequester) Backfill(ctx context.Context, server gomatrixserverlib.ServerName, roomID string,
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fromEventIDs []string, limit int) (*gomatrixserverlib.Transaction, error) {
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tx, err := b.fedClient.Backfill(ctx, server, roomID, limit, fromEventIDs)
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return &tx, err
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}
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func (b *backfillRequester) ProvideEvents(roomVer gomatrixserverlib.RoomVersion, eventIDs []string) ([]gomatrixserverlib.Event, error) {
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ctx := context.Background()
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nidMap, err := b.db.EventNIDs(ctx, eventIDs)
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if err != nil {
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logrus.WithError(err).WithField("event_ids", eventIDs).Error("Failed to find events")
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return nil, err
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}
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eventNIDs := make([]types.EventNID, len(nidMap))
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i := 0
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for _, nid := range nidMap {
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eventNIDs[i] = nid
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i++
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}
|
|
eventsWithNids, err := b.db.Events(ctx, eventNIDs)
|
|
if err != nil {
|
|
logrus.WithError(err).WithField("event_nids", eventNIDs).Error("Failed to load events")
|
|
return nil, err
|
|
}
|
|
events := make([]gomatrixserverlib.Event, len(eventsWithNids))
|
|
for i := range eventsWithNids {
|
|
events[i] = eventsWithNids[i].Event
|
|
}
|
|
return events, nil
|
|
}
|
|
|
|
// joinEventsFromHistoryVisibility returns all CURRENTLY joined members if the provided state indicated a 'shared' history visibility.
|
|
// TODO: Long term we probably want a history_visibility table which stores eventNID | visibility_enum so we can just
|
|
// pull all events and then filter by that table.
|
|
func joinEventsFromHistoryVisibility(
|
|
ctx context.Context, db storage.Database, roomID string, stateEntries []types.StateEntry) ([]types.Event, error) {
|
|
|
|
var eventNIDs []types.EventNID
|
|
for _, entry := range stateEntries {
|
|
// Filter the events to retrieve to only keep the membership events
|
|
if entry.EventTypeNID == types.MRoomHistoryVisibilityNID && entry.EventStateKeyNID == types.EmptyStateKeyNID {
|
|
eventNIDs = append(eventNIDs, entry.EventNID)
|
|
break
|
|
}
|
|
}
|
|
|
|
// Get all of the events in this state
|
|
stateEvents, err := db.Events(ctx, eventNIDs)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
events := make([]gomatrixserverlib.Event, len(stateEvents))
|
|
for i := range stateEvents {
|
|
events[i] = stateEvents[i].Event
|
|
}
|
|
visibility := auth.HistoryVisibilityForRoom(events)
|
|
if visibility != "shared" {
|
|
logrus.Infof("ServersAtEvent history visibility not shared: %s", visibility)
|
|
return nil, nil
|
|
}
|
|
// get joined members
|
|
info, err := db.RoomInfo(ctx, roomID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
joinEventNIDs, err := db.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, true, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return db.Events(ctx, joinEventNIDs)
|
|
}
|
|
|
|
func persistEvents(ctx context.Context, db storage.Database, events []gomatrixserverlib.HeaderedEvent) (types.RoomNID, map[string]types.Event) {
|
|
var roomNID types.RoomNID
|
|
backfilledEventMap := make(map[string]types.Event)
|
|
for j, ev := range events {
|
|
nidMap, err := db.EventNIDs(ctx, ev.AuthEventIDs())
|
|
if err != nil { // this shouldn't happen as RequestBackfill already found them
|
|
logrus.WithError(err).WithField("auth_events", ev.AuthEventIDs()).Error("Failed to find one or more auth events")
|
|
continue
|
|
}
|
|
authNids := make([]types.EventNID, len(nidMap))
|
|
i := 0
|
|
for _, nid := range nidMap {
|
|
authNids[i] = nid
|
|
i++
|
|
}
|
|
var stateAtEvent types.StateAtEvent
|
|
var redactedEventID string
|
|
var redactionEvent *gomatrixserverlib.Event
|
|
roomNID, stateAtEvent, redactionEvent, redactedEventID, err = db.StoreEvent(ctx, ev.Unwrap(), nil, authNids)
|
|
if err != nil {
|
|
logrus.WithError(err).WithField("event_id", ev.EventID()).Error("Failed to persist event")
|
|
continue
|
|
}
|
|
// If storing this event results in it being redacted, then do so.
|
|
// It's also possible for this event to be a redaction which results in another event being
|
|
// redacted, which we don't care about since we aren't returning it in this backfill.
|
|
if redactedEventID == ev.EventID() {
|
|
eventToRedact := ev.Unwrap()
|
|
redactedEvent, err := eventutil.RedactEvent(redactionEvent, &eventToRedact)
|
|
if err != nil {
|
|
logrus.WithError(err).WithField("event_id", ev.EventID()).Error("Failed to redact event")
|
|
continue
|
|
}
|
|
ev = redactedEvent.Headered(ev.RoomVersion)
|
|
events[j] = ev
|
|
}
|
|
backfilledEventMap[ev.EventID()] = types.Event{
|
|
EventNID: stateAtEvent.StateEntry.EventNID,
|
|
Event: ev.Unwrap(),
|
|
}
|
|
}
|
|
return roomNID, backfilledEventMap
|
|
}
|