Early pagination

This commit is contained in:
Neil Alexander 2022-10-11 16:28:33 +01:00
parent 25c8655497
commit 6811998611
No known key found for this signature in database
GPG key ID: A02A2019A2BB0944
6 changed files with 44 additions and 14 deletions

View file

@ -68,8 +68,6 @@ func Relations(req *http.Request, device *api.Device, syncDB storage.Database, r
}
}
res := &RelationsResponse{}
snapshot, err := syncDB.NewDatabaseSnapshot(req.Context())
if err != nil {
return jsonerror.InternalServerError()
@ -83,6 +81,7 @@ func Relations(req *http.Request, device *api.Device, syncDB storage.Database, r
}
}
res := &RelationsResponse{}
res.Chunk, res.PrevBatch, res.NextBatch, err = snapshot.RelationsFor(
req.Context(), roomID, eventID, relType, eventType, from, to, limit,
)

View file

@ -119,7 +119,7 @@ func (s *relationsStatements) DeleteRelation(
func (s *relationsStatements) SelectRelationsInRange(
ctx context.Context, txn *sql.Tx, roomID, eventID, relType string,
r types.Range, limit int,
) (map[string][]string, types.StreamPosition, error) {
) (map[string][]types.RelationEntry, types.StreamPosition, error) {
var lastPos types.StreamPosition
var rows *sql.Rows
var err error
@ -134,7 +134,7 @@ func (s *relationsStatements) SelectRelationsInRange(
return nil, lastPos, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectRelationsInRange: rows.close() failed")
result := map[string][]string{}
result := map[string][]types.RelationEntry{}
for rows.Next() {
var (
id types.StreamPosition
@ -148,7 +148,10 @@ func (s *relationsStatements) SelectRelationsInRange(
if id > lastPos {
lastPos = id
}
result[relType] = append(result[relType], childEventID)
result[relType] = append(result[relType], types.RelationEntry{
Position: id,
EventID: childEventID,
})
}
if lastPos == 0 {
lastPos = r.To

View file

@ -598,28 +598,47 @@ func (d *DatabaseTransaction) MaxStreamPositionForRelations(ctx context.Context)
func (d *DatabaseTransaction) RelationsFor(ctx context.Context, roomID, eventID, relType, eventType string, from, to types.StreamPosition, limit int) (
clientEvents []gomatrixserverlib.ClientEvent, prevBatch, nextBatch string, err error,
) {
// TODO: Nothing here is limited or setting prev_batch or next_batch
var eventIDs []string
r := types.Range{
From: from,
To: to,
Backwards: from > to,
}
rels, _, err := d.Relations.SelectRelationsInRange(ctx, d.txn, roomID, eventID, relType, r, limit+1)
relations, _, err := d.Relations.SelectRelationsInRange(ctx, d.txn, roomID, eventID, relType, r, limit+1)
if err != nil {
return nil, "", "", fmt.Errorf("d.Relations.SelectRelationsInRange: %w", err)
}
entries := []types.RelationEntry{}
if relType != "" {
eventIDs = rels[relType]
entries = relations[relType]
} else {
for _, ids := range rels {
eventIDs = append(eventIDs, ids...)
for _, e := range relations {
entries = append(entries, e...)
}
}
if len(entries) == 0 {
return nil, "", "", nil
}
if from > 0 {
prevBatch = fmt.Sprintf("%d", entries[0].Position-1)
}
if len(entries) > limit {
nextBatch = fmt.Sprintf("%d", entries[len(entries)-1].Position)
entries = entries[:len(entries)-1]
}
for _, entry := range entries {
eventIDs = append(eventIDs, entry.EventID)
}
events, err := d.OutputEvents.SelectEvents(ctx, d.txn, eventIDs, nil, true)
if err != nil {
return nil, "", "", fmt.Errorf("d.OutputEvents.SelectEvents: %w", err)
}
for _, event := range events {
if eventType != "" && event.Type() != eventType {
continue
@ -629,5 +648,6 @@ func (d *DatabaseTransaction) RelationsFor(ctx context.Context, roomID, eventID,
gomatrixserverlib.ToClientEvent(event.Event, gomatrixserverlib.FormatAll),
)
}
return clientEvents, prevBatch, nextBatch, nil
}

View file

@ -123,7 +123,7 @@ func (s *relationsStatements) DeleteRelation(
func (s *relationsStatements) SelectRelationsInRange(
ctx context.Context, txn *sql.Tx, roomID, eventID, relType string,
r types.Range, limit int,
) (map[string][]string, types.StreamPosition, error) {
) (map[string][]types.RelationEntry, types.StreamPosition, error) {
var lastPos types.StreamPosition
var rows *sql.Rows
var err error
@ -138,7 +138,7 @@ func (s *relationsStatements) SelectRelationsInRange(
return nil, lastPos, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectRelationsInRange: rows.close() failed")
result := map[string][]string{}
result := map[string][]types.RelationEntry{}
for rows.Next() {
var (
id types.StreamPosition
@ -152,7 +152,10 @@ func (s *relationsStatements) SelectRelationsInRange(
if id > lastPos {
lastPos = id
}
result[relType] = append(result[relType], childEventID)
result[relType] = append(result[relType], types.RelationEntry{
Position: id,
EventID: childEventID,
})
}
if lastPos == 0 {
lastPos = r.To

View file

@ -210,6 +210,6 @@ type Presence interface {
type Relations interface {
InsertRelation(ctx context.Context, txn *sql.Tx, roomID, eventID, childEventID, relType string) (streamPos types.StreamPosition, err error)
DeleteRelation(ctx context.Context, txn *sql.Tx, roomID, childEventID string) error
SelectRelationsInRange(ctx context.Context, txn *sql.Tx, roomID, eventID, relType string, r types.Range, limit int) (map[string][]string, types.StreamPosition, error)
SelectRelationsInRange(ctx context.Context, txn *sql.Tx, roomID, eventID, relType string, r types.Range, limit int) (map[string][]types.RelationEntry, types.StreamPosition, error)
SelectMaxRelationID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

View file

@ -607,3 +607,8 @@ type OutputSendToDeviceEvent struct {
type IgnoredUsers struct {
List map[string]interface{} `json:"ignored_users"`
}
type RelationEntry struct {
Position StreamPosition
EventID string
}