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Return sane values if StreamToTopologicalPosition can't work out the right thing to do

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This commit is contained in:
Neil Alexander 2022-03-09 12:21:34 +00:00
parent 74ad558e82
commit 602fa4878a
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GPG key ID: A02A2019A2BB0944
1 changed files with 13 additions and 3 deletions
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16
syncapi/storage/shared/syncserver.go
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@ -486,10 +486,20 @@ func (d *Database) StreamToTopologicalPosition(
ctx context.Context, roomID string, streamPos types.StreamPosition, backwardOrdering bool,
) (types.TopologyToken, error) {
topoPos, err := d.Topology.SelectStreamToTopologicalPosition(ctx, nil, roomID, streamPos, backwardOrdering)
if err != nil {
return types.TopologyToken{}, err
switch {
case err == sql.ErrNoRows && backwardOrdering: // no events in range, going backward
return types.TopologyToken{PDUPosition: streamPos}, nil
case err == sql.ErrNoRows && !backwardOrdering: // no events in range, going forward
topoPos, streamPos, err = d.Topology.SelectMaxPositionInTopology(ctx, nil, roomID)
if err != nil {
return types.TopologyToken{}, fmt.Errorf("d.Topology.SelectMaxPositionInTopology: %w", err)
}
return types.TopologyToken{Depth: topoPos, PDUPosition: streamPos}, nil
case err != nil: // some other error happened
return types.TopologyToken{}, fmt.Errorf("d.Topology.SelectStreamToTopologicalPosition: %w", err)
default:
return types.TopologyToken{Depth: topoPos, PDUPosition: streamPos}, nil
}
return types.TopologyToken{Depth: topoPos, PDUPosition: streamPos}, nil
}
func (d *Database) GetFilter(