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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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16
syncapi/routing/messages.go
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@ -245,24 +245,20 @@ func (r *messagesReq) retrieveEvents() (
// change the way topological positions are defined (as depth isn't the most
// reliable way to define it), it would be easier and less troublesome to
// only have to change it in one place, i.e. the database.
startPos, startStreamPos, err := r.db.EventPositionInTopology(
start, err = r.db.EventPositionInTopology(
r.ctx, events[0].EventID(),
)
if err != nil {
err = fmt.Errorf("EventPositionInTopology: for start event %s: %w", events[0].EventID(), err)
return
}
endPos, endStreamPos, err := r.db.EventPositionInTopology(
end, err = r.db.EventPositionInTopology(
r.ctx, events[len(events)-1].EventID(),
)
if err != nil {
err = fmt.Errorf("EventPositionInTopology: for end event %s: %w", events[len(events)-1].EventID(), err)
return
}
// Generate pagination tokens to send to the client using the positions
// retrieved previously.
start = types.NewTopologyToken(startPos, startStreamPos)
end = types.NewTopologyToken(endPos, endStreamPos)
if r.backwardOrdering {
// A stream/topological position is a cursor located between two events.
@ -431,14 +427,10 @@ func setToDefault(
) (to types.TopologyToken, err error) {
if backwardOrdering {
// go 1 earlier than the first event so we correctly fetch the earliest event
// this is because Database.GetEventsInTopologicalRange is exclusive of the lower-bound.
to = types.NewTopologyToken(0, 0)
} else {
var depth, stream types.StreamPosition
depth, stream, err = db.MaxTopologicalPosition(ctx, roomID)
if err != nil {
return
}
to = types.NewTopologyToken(depth, stream)
to, err = db.MaxTopologicalPosition(ctx, roomID)
}
return