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kv: add Reader read-only seam interface #109

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Merged
oc-engteam merged 1 commit into from
Jul 8, 2026
Merged

kv: add Reader read-only seam interface #109

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18 changes: 18 additions & 0 deletions core/kv/kv.go
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Original file line number Diff line number Diff line change
Expand Up @@ -79,3 +79,21 @@ type Snapshot interface {
// through the Snapshot after its Close are undefined; callers must not do that.
Close() error
}

// Reader is the read-only surface shared by Store and Snapshot — the same
// Get/Scan/ScanRange methods. Their semantics (value handling on Get; the
// callback slice-validity and stop-on-false rules on Scan/ScanRange) are as
// documented on Store and Snapshot, which remain the canonical contract; this
// interface only names the shared subset so a read path can be written against
// either the live Store or a consistent point-in-time Snapshot.
type Reader interface {
Get(key []byte) ([]byte, error)
Scan(prefix []byte, cb func(key, value []byte) bool) error
ScanRange(begin, end []byte, cb func(key, value []byte) bool) error
}

// Store and Snapshot both satisfy Reader (compile-time assertions).
var (
_ Reader = (Store)(nil)
_ Reader = (Snapshot)(nil)
)
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