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Cleanup syncapi topology logic (#1035)

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* Cleanup syncapi topology logic

* Variable renaming

* comments
This commit is contained in:
Kegsay 2020-05-14 17:30:16 +01:00 • committed by GitHub
parent 3cb04e8004
commit 7ca230e931
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9 changed files with 67 additions and 154 deletions
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68
syncapi/storage/shared/syncserver.go
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@ -319,25 +319,25 @@ func (d *Database) GetEventsInTopologicalRange(
roomID string, limit int,
backwardOrdering bool,
) (events []types.StreamEvent, err error) {
// Determine the backward and forward limit, i.e. the upper and lower
// limits to the selection in the room's topology, from the direction.
var backwardLimit, forwardLimit, forwardMicroLimit types.StreamPosition
var minDepth, maxDepth, maxStreamPosForMaxDepth types.StreamPosition
if backwardOrdering {
// Backward ordering is antichronological (latest event to oldest
// one).
backwardLimit = to.Depth()
forwardLimit = from.Depth()
forwardMicroLimit = from.PDUPosition()
// Backward ordering means the 'from' token has a higher depth than the 'to' token
minDepth = to.Depth()
maxDepth = from.Depth()
// for cases where we have say 5 events with the same depth, the TopologyToken needs to
// know which of the 5 the client has seen. This is done by using the PDU position.
// Events with the same maxDepth but less than this PDU position will be returned.
maxStreamPosForMaxDepth = from.PDUPosition()
} else {
// Forward ordering is chronological (oldest event to latest one).
backwardLimit = from.Depth()
forwardLimit = to.Depth()
// Forward ordering means the 'from' token has a lower depth than the 'to' token.
minDepth = from.Depth()
maxDepth = to.Depth()
}
// Select the event IDs from the defined range.
var eIDs []string
eIDs, err = d.Topology.SelectEventIDsInRange(
ctx, nil, roomID, backwardLimit, forwardLimit, forwardMicroLimit, limit, !backwardOrdering,
ctx, nil, roomID, minDepth, maxDepth, maxStreamPosForMaxDepth, limit, !backwardOrdering,
)
if err != nil {
return
@ -350,7 +350,7 @@ func (d *Database) GetEventsInTopologicalRange(
func (d *Database) SyncPosition(ctx context.Context) (tok types.StreamingToken, err error) {
err = common.WithTransaction(d.DB, func(txn *sql.Tx) error {
pos, err := d.SyncPositionTx(ctx, txn)
pos, err := d.syncPositionTx(ctx, txn)
if err != nil {
return err
}
@ -368,29 +368,25 @@ func (d *Database) BackwardExtremitiesForRoom(
func (d *Database) MaxTopologicalPosition(
ctx context.Context, roomID string,
) (depth types.StreamPosition, stream types.StreamPosition, err error) {
return d.Topology.SelectMaxPositionInTopology(ctx, nil, roomID)
}
func (d *Database) EventsAtTopologicalPosition(
ctx context.Context, roomID string, pos types.StreamPosition,
) ([]types.StreamEvent, error) {
eIDs, err := d.Topology.SelectEventIDsFromPosition(ctx, nil, roomID, pos)
) (types.TopologyToken, error) {
depth, streamPos, err := d.Topology.SelectMaxPositionInTopology(ctx, nil, roomID)
if err != nil {
return nil, err
return types.NewTopologyToken(0, 0), err
}
return d.OutputEvents.SelectEvents(ctx, nil, eIDs)
return types.NewTopologyToken(depth, streamPos), nil
}
func (d *Database) EventPositionInTopology(
ctx context.Context, eventID string,
) (depth types.StreamPosition, stream types.StreamPosition, err error) {
return d.Topology.SelectPositionInTopology(ctx, nil, eventID)
) (types.TopologyToken, error) {
depth, stream, err := d.Topology.SelectPositionInTopology(ctx, nil, eventID)
if err != nil {
return types.NewTopologyToken(0, 0), err
}
return types.NewTopologyToken(depth, stream), nil
}
// TODO FIXME TEMPORARY PUBLIC
func (d *Database) SyncPositionTx(
func (d *Database) syncPositionTx(
ctx context.Context, txn *sql.Tx,
) (sp types.StreamingToken, err error) {
@ -466,7 +462,7 @@ func (d *Database) addPDUDeltaToResponse(
}
// TODO: This should be done in getStateDeltas
if err = d.AddInvitesToResponse(ctx, txn, device.UserID, fromPos, toPos, res); err != nil {
if err = d.addInvitesToResponse(ctx, txn, device.UserID, fromPos, toPos, res); err != nil {
return nil, err
}
@ -510,8 +506,7 @@ func (d *Database) addTypingDeltaToResponse(
// addEDUDeltaToResponse adds updates for EDUs of each type since fromPos if
// the positions of that type are not equal in fromPos and toPos.
// TODO FIXME TEMPORARY PUBLIC
func (d *Database) AddEDUDeltaToResponse(
func (d *Database) addEDUDeltaToResponse(
fromPos, toPos types.StreamingToken,
joinedRoomIDs []string,
res *types.Response,
@ -551,7 +546,7 @@ func (d *Database) IncrementalSync(
return nil, err
}
err = d.AddEDUDeltaToResponse(
err = d.addEDUDeltaToResponse(
fromPos, toPos, joinedRoomIDs, res,
)
if err != nil {
@ -590,7 +585,7 @@ func (d *Database) getResponseWithPDUsForCompleteSync(
}()
// Get the current sync position which we will base the sync response on.
toPos, err = d.SyncPositionTx(ctx, txn)
toPos, err = d.syncPositionTx(ctx, txn)
if err != nil {
return
}
@ -649,7 +644,7 @@ func (d *Database) getResponseWithPDUsForCompleteSync(
res.Rooms.Join[roomID] = *jr
}
if err = d.AddInvitesToResponse(ctx, txn, userID, 0, toPos.PDUPosition(), res); err != nil {
if err = d.addInvitesToResponse(ctx, txn, userID, 0, toPos.PDUPosition(), res); err != nil {
return
}
@ -668,7 +663,7 @@ func (d *Database) CompleteSync(
}
// Use a zero value SyncPosition for fromPos so all EDU states are added.
err = d.AddEDUDeltaToResponse(
err = d.addEDUDeltaToResponse(
types.NewStreamToken(0, 0), toPos, joinedRoomIDs, res,
)
if err != nil {
@ -688,8 +683,7 @@ var txReadOnlySnapshot = sql.TxOptions{
ReadOnly: true,
}
// TODO FIXME temporary public
func (d *Database) AddInvitesToResponse(
func (d *Database) addInvitesToResponse(
ctx context.Context, txn *sql.Tx,
userID string,
fromPos, toPos types.StreamPosition,