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sytest: Make 'Inbound federation can backfill events' pass (#1051)

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* sytest: Make 'Inbound federation can backfill events' pass

This breaks 'Outbound federation can backfill events' because now
we are returning the right number of events, which the previous
test was relying on.

Previously, /messages was backfilling the membership event, causing
the test to pass. Now we are no longer backfilling the membership
event due to the change in this commit, causing the test to fail.

The test should instead be returning the membership event locally
from synacpis database, but it doesn't do it fast enough, resulting
in a no-op /sync response with a next_batch=s0_0 which will never
pick up the local membership event when it rolls in. The test
does attempt to retry, but doesn't take the new next_batch=s1_0
resulting in it missing from the /messages response.

* Linting
This commit is contained in:
Kegsay 2020-05-20 16:04:31 +01:00 committed by GitHub
parent 260e69d138
commit 1414922026
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
11 changed files with 86 additions and 45 deletions
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17
federationapi/routing/backfill.go
View file

@ -69,9 +69,14 @@ func Backfill(
// Populate the request.
req := api.QueryBackfillRequest{
RoomID: roomID,
EarliestEventsIDs: eIDs,
ServerName: request.Origin(),
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,
// only when making them. TODO: Think of a better API shape
BackwardsExtremities: map[string][]string{
"": eIDs,
},
ServerName: request.Origin(),
}
if req.Limit, err = strconv.Atoi(limit); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("strconv.Atoi failed")
@ -105,6 +110,12 @@ func Backfill(
eventJSONs = append(eventJSONs, e.JSON())
}
// sytest wants these in reversed order, similar to /messages, so reverse them now.
for i := len(eventJSONs)/2 - 1; i >= 0; i-- {
opp := len(eventJSONs) - 1 - i
eventJSONs[i], eventJSONs[opp] = eventJSONs[opp], eventJSONs[i]
}
txn := gomatrixserverlib.Transaction{
Origin: cfg.Matrix.ServerName,
PDUs: eventJSONs,

15
roomserver/api/query.go
View file

@ -21,6 +21,7 @@ import (
commonHTTP "github.com/matrix-org/dendrite/common/http"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
opentracing "github.com/opentracing/opentracing-go"
)
@ -228,14 +229,24 @@ type QueryStateAndAuthChainResponse struct {
type QueryBackfillRequest struct {
// The room to backfill
RoomID string `json:"room_id"`
// Events to start paginating from.
EarliestEventsIDs []string `json:"earliest_event_ids"`
// 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.

14
roomserver/internal/query.go
View file

@ -495,14 +495,8 @@ func (r *RoomserverInternalAPI) QueryBackfill(
// defines the highest number of elements in the map below.
visited := make(map[string]bool, request.Limit)
// The provided event IDs have already been seen by the request's emitter,
// and will be retrieved anyway, so there's no need to care about them if
// they appear in our exploration of the event tree.
for _, id := range request.EarliestEventsIDs {
visited[id] = true
}
front = request.EarliestEventsIDs
// this will include these events which is what we want
front = request.PrevEventIDs()
// Scan the event tree for events to send back.
resultNIDs, err := r.scanEventTree(ctx, front, visited, request.Limit, request.ServerName)
@ -534,7 +528,7 @@ func (r *RoomserverInternalAPI) backfillViaFederation(ctx context.Context, req *
if err != nil {
return fmt.Errorf("backfillViaFederation: unknown room version for room %s : %w", req.RoomID, err)
}
requester := newBackfillRequester(r.DB, r.FedClient, r.ServerName)
requester := newBackfillRequester(r.DB, r.FedClient, r.ServerName, req.BackwardsExtremities)
// Request 100 items regardless of what the query asks for.
// We don't want to go much higher than this.
// We can't honour exactly the limit as some sytests rely on requesting more for tests to pass
@ -542,7 +536,7 @@ func (r *RoomserverInternalAPI) backfillViaFederation(ctx context.Context, req *
// Specifically the test "Outbound federation can backfill events"
events, err := gomatrixserverlib.RequestBackfill(
ctx, requester,
r.KeyRing, req.RoomID, roomVer, req.EarliestEventsIDs, 100)
r.KeyRing, req.RoomID, roomVer, req.PrevEventIDs(), 100)
if err != nil {
return err
}

35
roomserver/internal/query_backfill.go
View file

@ -16,6 +16,7 @@ type backfillRequester struct {
db storage.Database
fedClient *gomatrixserverlib.FederationClient
thisServer gomatrixserverlib.ServerName
bwExtrems map[string][]string
// per-request state
servers []gomatrixserverlib.ServerName
@ -23,13 +24,14 @@ type backfillRequester struct {
eventIDMap map[string]gomatrixserverlib.Event
}
func newBackfillRequester(db storage.Database, fedClient *gomatrixserverlib.FederationClient, thisServer gomatrixserverlib.ServerName) *backfillRequester {
func newBackfillRequester(db storage.Database, fedClient *gomatrixserverlib.FederationClient, thisServer gomatrixserverlib.ServerName, bwExtrems map[string][]string) *backfillRequester {
return &backfillRequester{
db: db,
fedClient: fedClient,
thisServer: thisServer,
eventIDToBeforeStateIDs: make(map[string][]string),
eventIDMap: make(map[string]gomatrixserverlib.Event),
bwExtrems: bwExtrems,
}
}
@ -160,26 +162,44 @@ func (b *backfillRequester) StateBeforeEvent(ctx context.Context, roomVer gomatr
// It returns a list of servers which can be queried for backfill requests. These servers
// will be servers that are in the room already. The entries at the beginning are preferred servers
// and will be tried first. An empty list will fail the request.
func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID string) (servers []gomatrixserverlib.ServerName) {
func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID string) []gomatrixserverlib.ServerName {
// eventID will be a prev_event ID of a backwards extremity, meaning we will not have a database entry for it. Instead, use
// its successor, so look it up.
successor := ""
FindSuccessor:
for sucID, prevEventIDs := range b.bwExtrems {
for _, pe := range prevEventIDs {
if pe == eventID {
successor = sucID
break FindSuccessor
}
}
}
if successor == "" {
logrus.WithField("event_id", eventID).Error("ServersAtEvent: failed to find successor of this event to determine room state")
return nil
}
eventID = successor
// getMembershipsBeforeEventNID requires a NID, so retrieving the NID for
// the event is necessary.
NIDs, err := b.db.EventNIDs(ctx, []string{eventID})
if err != nil {
logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to get event NID for event")
return
return nil
}
stateEntries, err := stateBeforeEvent(ctx, b.db, NIDs[eventID])
if err != nil {
logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to load state before event")
return
return nil
}
// possibly return all joined servers depending on history visiblity
memberEventsFromVis, err := joinEventsFromHistoryVisibility(ctx, b.db, roomID, stateEntries)
if err != nil {
logrus.WithError(err).Error("ServersAtEvent: failed calculate servers from history visibility rules")
return
return nil
}
logrus.Infof("ServersAtEvent including %d current events from history visibility", len(memberEventsFromVis))
@ -189,7 +209,7 @@ func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID
memberEvents, err := getMembershipsAtState(ctx, b.db, stateEntries, true)
if err != nil {
logrus.WithField("event_id", eventID).WithError(err).Error("ServersAtEvent: failed to get memberships before event")
return
return nil
}
memberEvents = append(memberEvents, memberEventsFromVis...)
@ -198,6 +218,7 @@ func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID
for _, event := range memberEvents {
serverSet[event.Origin()] = true
}
var servers []gomatrixserverlib.ServerName
for server := range serverSet {
if server == b.thisServer {
continue
@ -205,7 +226,7 @@ func (b *backfillRequester) ServersAtEvent(ctx context.Context, roomID, eventID
servers = append(servers, server)
}
b.servers = servers
return
return servers
}
// Backfill performs a backfill request to the given server.

11
syncapi/routing/messages.go
View file

@ -205,6 +205,7 @@ func (r *messagesReq) retrieveEvents() (
}
var events []gomatrixserverlib.HeaderedEvent
util.GetLogger(r.ctx).WithField("start", start).WithField("end", end).Infof("Fetched %d events locally", len(streamEvents))
// There can be two reasons for streamEvents to be empty: either we've
// reached the oldest event in the room (or the most recent one, depending
@ -373,13 +374,13 @@ func (e eventsByDepth) Less(i, j int) bool {
// event, or if there is no remote homeserver to contact.
// 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, fromEventIDs []string, limit int) ([]gomatrixserverlib.HeaderedEvent, error) {
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{
RoomID: roomID,
EarliestEventsIDs: fromEventIDs,
Limit: limit,
ServerName: r.cfg.Matrix.ServerName,
RoomID: roomID,
BackwardsExtremities: backwardsExtremities,
Limit: limit,
ServerName: r.cfg.Matrix.ServerName,
}, &res)
if err != nil {
return nil, fmt.Errorf("QueryBackfill failed: %w", err)

5
syncapi/storage/interface.go
View file

@ -94,9 +94,8 @@ type Database interface {
GetEventsInTopologicalRange(ctx context.Context, from, to *types.TopologyToken, roomID string, limit int, backwardOrdering bool) (events []types.StreamEvent, err error)
// EventPositionInTopology returns the depth and stream position of the given event.
EventPositionInTopology(ctx context.Context, eventID string) (types.TopologyToken, error)
// BackwardExtremitiesForRoom returns the event IDs of all of the backward
// extremities we know of for a given room.
BackwardExtremitiesForRoom(ctx context.Context, roomID string) (backwardExtremities []string, err error)
// BackwardExtremitiesForRoom returns a map of backwards extremity event ID to a list of its prev_events.
BackwardExtremitiesForRoom(ctx context.Context, roomID string) (backwardExtremities map[string][]string, err error)
// MaxTopologicalPosition returns the highest topological position for a given room.
MaxTopologicalPosition(ctx context.Context, roomID string) (types.TopologyToken, error)
// StreamEventsToEvents converts streamEvent to Event. If device is non-nil and

13
syncapi/storage/postgres/backwards_extremities_table.go
View file

@ -41,7 +41,7 @@ const insertBackwardExtremitySQL = "" +
" ON CONFLICT DO NOTHING"
const selectBackwardExtremitiesForRoomSQL = "" +
"SELECT DISTINCT event_id FROM syncapi_backward_extremities WHERE room_id = $1"
"SELECT event_id, prev_event_id FROM syncapi_backward_extremities WHERE room_id = $1"
const deleteBackwardExtremitySQL = "" +
"DELETE FROM syncapi_backward_extremities WHERE room_id = $1 AND prev_event_id = $2"
@ -79,23 +79,24 @@ func (s *backwardExtremitiesStatements) InsertsBackwardExtremity(
func (s *backwardExtremitiesStatements) SelectBackwardExtremitiesForRoom(
ctx context.Context, roomID string,
) (eventIDs []string, err error) {
) (bwExtrems map[string][]string, err error) {
rows, err := s.selectBackwardExtremitiesForRoomStmt.QueryContext(ctx, roomID)
if err != nil {
return
}
defer common.CloseAndLogIfError(ctx, rows, "selectBackwardExtremitiesForRoom: rows.close() failed")
bwExtrems = make(map[string][]string)
for rows.Next() {
var eID string
if err = rows.Scan(&eID); err != nil {
var prevEventID string
if err = rows.Scan(&eID, &prevEventID); err != nil {
return
}
eventIDs = append(eventIDs, eID)
bwExtrems[eID] = append(bwExtrems[eID], prevEventID)
}
return eventIDs, rows.Err()
return bwExtrems, rows.Err()
}
func (s *backwardExtremitiesStatements) DeleteBackwardExtremity(

3
syncapi/storage/shared/syncserver.go
View file

@ -310,6 +310,7 @@ func (d *Database) updateRoomState(
}
membership = &value
}
if err := d.CurrentRoomState.UpsertRoomState(ctx, txn, event, membership, pduPosition); err != nil {
return err
}
@ -367,7 +368,7 @@ func (d *Database) SyncPosition(ctx context.Context) (tok types.StreamingToken,
func (d *Database) BackwardExtremitiesForRoom(
ctx context.Context, roomID string,
) (backwardExtremities []string, err error) {
) (backwardExtremities map[string][]string, err error) {
return d.BackwardExtremities.SelectBackwardExtremitiesForRoom(ctx, roomID)
}

13
syncapi/storage/sqlite3/backwards_extremities_table.go
View file

@ -41,7 +41,7 @@ const insertBackwardExtremitySQL = "" +
" ON CONFLICT (room_id, event_id, prev_event_id) DO NOTHING"
const selectBackwardExtremitiesForRoomSQL = "" +
"SELECT DISTINCT event_id FROM syncapi_backward_extremities WHERE room_id = $1"
"SELECT event_id, prev_event_id FROM syncapi_backward_extremities WHERE room_id = $1"
const deleteBackwardExtremitySQL = "" +
"DELETE FROM syncapi_backward_extremities WHERE room_id = $1 AND prev_event_id = $2"
@ -79,23 +79,24 @@ func (s *backwardExtremitiesStatements) InsertsBackwardExtremity(
func (s *backwardExtremitiesStatements) SelectBackwardExtremitiesForRoom(
ctx context.Context, roomID string,
) (eventIDs []string, err error) {
) (bwExtrems map[string][]string, err error) {
rows, err := s.selectBackwardExtremitiesForRoomStmt.QueryContext(ctx, roomID)
if err != nil {
return
}
defer common.CloseAndLogIfError(ctx, rows, "selectBackwardExtremitiesForRoom: rows.close() failed")
bwExtrems = make(map[string][]string)
for rows.Next() {
var eID string
if err = rows.Scan(&eID); err != nil {
var prevEventID string
if err = rows.Scan(&eID, &prevEventID); err != nil {
return
}
eventIDs = append(eventIDs, eID)
bwExtrems[eID] = append(bwExtrems[eID], prevEventID)
}
return eventIDs, rows.Err()
return bwExtrems, rows.Err()
}
func (s *backwardExtremitiesStatements) DeleteBackwardExtremity(

4
syncapi/storage/tables/interface.go
View file

@ -89,8 +89,8 @@ type CurrentRoomState interface {
type BackwardsExtremities interface {
// InsertsBackwardExtremity inserts a new backwards extremity.
InsertsBackwardExtremity(ctx context.Context, txn *sql.Tx, roomID, eventID string, prevEventID string) (err error)
// SelectBackwardExtremitiesForRoom retrieves all backwards extremities for the room.
SelectBackwardExtremitiesForRoom(ctx context.Context, roomID string) (eventIDs []string, err error)
// SelectBackwardExtremitiesForRoom retrieves all backwards extremities for the room, as a map of event_id to list of prev_event_ids.
SelectBackwardExtremitiesForRoom(ctx context.Context, roomID string) (bwExtrems map[string][]string, err error)
// DeleteBackwardExtremity removes a backwards extremity for a room, if one existed.
DeleteBackwardExtremity(ctx context.Context, txn *sql.Tx, roomID, knownEventID string) (err error)
}

1
sytest-whitelist
View file

@ -280,3 +280,4 @@ Inbound federation can get public room list
An event which redacts itself should be ignored
A pair of events which redact each other should be ignored
Outbound federation can backfill events
Inbound federation can backfill events