617b822efa
* add kv type * add changelog entry * fix build * replace sdkkv with kv * revert change * fix some tests * proto-gen * fix tests Co-authored-by: Aleksandr Bezobchuk <aleks.bezobchuk@gmail.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
42 lines
916 B
Go
42 lines
916 B
Go
package store
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
sdkkv "github.com/cosmos/cosmos-sdk/types/kv"
|
|
)
|
|
|
|
// Gets the first item.
|
|
func First(st KVStore, start, end []byte) (kv sdkkv.Pair, ok bool) {
|
|
iter := st.Iterator(start, end)
|
|
if !iter.Valid() {
|
|
return kv, false
|
|
}
|
|
defer iter.Close()
|
|
|
|
return sdkkv.Pair{Key: iter.Key(), Value: iter.Value()}, true
|
|
}
|
|
|
|
// Gets the last item. `end` is exclusive.
|
|
func Last(st KVStore, start, end []byte) (kv sdkkv.Pair, ok bool) {
|
|
iter := st.ReverseIterator(end, start)
|
|
if !iter.Valid() {
|
|
if v := st.Get(start); v != nil {
|
|
return sdkkv.Pair{Key: sdk.CopyBytes(start), Value: sdk.CopyBytes(v)}, true
|
|
}
|
|
return kv, false
|
|
}
|
|
defer iter.Close()
|
|
|
|
if bytes.Equal(iter.Key(), end) {
|
|
// Skip this one, end is exclusive.
|
|
iter.Next()
|
|
if !iter.Valid() {
|
|
return kv, false
|
|
}
|
|
}
|
|
|
|
return sdkkv.Pair{Key: iter.Key(), Value: iter.Value()}, true
|
|
}
|