func buildPrimaryIndex(keyspace datastore.Keyspace, hintIndexes, otherIndexes []datastore.Index) (
primary datastore.PrimaryIndex, err error) {
ok := false
// Prefer hints
for _, index := range hintIndexes {
if !index.IsPrimary() {
continue
}
primary, ok = index.(datastore.PrimaryIndex)
if ok {
return
} else {
return nil, fmt.Errorf("Unable to cast primary index %s", index.Name())
}
}
// Consider other primary indexes
if otherIndexes != nil {
for _, index := range otherIndexes {
if !index.IsPrimary() {
continue
}
primary, ok = index.(datastore.PrimaryIndex)
if ok {
return
} else {
return nil, fmt.Errorf("Unable to cast primary index %s", index.Name())
}
}
}
// Return first online primary index
indexers, er := keyspace.Indexers()
if er != nil {
return nil, err
}
for _, indexer := range indexers {
primaries, er := indexer.PrimaryIndexes()
if er != nil {
return nil, er
}
for _, primary = range primaries {
state, _, er := primary.State()
if er != nil {
return nil, er
}
if state == datastore.ONLINE {
return
}
}
}
if primary == nil {
return nil, fmt.Errorf(
"No primary index on keyspace %s. Use CREATE PRIMARY INDEX to create one.",
keyspace.Name())
}
return nil, fmt.Errorf("Primary index %s not online.", primary.Name())
}
