refactor: narrow storage compatibility surfaces (#3585)

* refactor: narrow storage compatibility surfaces

* refactor: narrow observability compatibility surfaces

crates/s3select-api/src/storage_compat.rs

@@ -12,10 +12,30 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-pub(crate) mod ecstore {
-    pub(crate) use rustfs_ecstore::{error, resolve_object_store_handle, set_disk, store};
-}
-
 pub(crate) type SelectGetObjectReader = rustfs_ecstore::store_api::GetObjectReader;
 pub(crate) type SelectObjectInfo = rustfs_ecstore::store_api::ObjectInfo;
 pub(crate) type SelectObjectOptions = rustfs_ecstore::store_api::ObjectOptions;
+pub(crate) type SelectStorageError = rustfs_ecstore::error::StorageError;
+pub(crate) type SelectStore = rustfs_ecstore::store::ECStore;
+
+pub(crate) const SELECT_DEFAULT_READ_BUFFER_SIZE: usize = rustfs_ecstore::set_disk::DEFAULT_READ_BUFFER_SIZE;
+
+pub(crate) fn select_default_read_buffer_size_u64() -> u64 {
+    u64::try_from(SELECT_DEFAULT_READ_BUFFER_SIZE).unwrap_or(u64::MAX)
+}
+
+pub(crate) fn resolve_select_object_store_handle() -> Option<std::sync::Arc<SelectStore>> {
+    rustfs_ecstore::resolve_object_store_handle()
+}
+
+pub(crate) fn select_is_err_bucket_not_found(err: &SelectStorageError) -> bool {
+    rustfs_ecstore::error::is_err_bucket_not_found(err)
+}
+
+pub(crate) fn select_is_err_object_not_found(err: &SelectStorageError) -> bool {
+    rustfs_ecstore::error::is_err_object_not_found(err)
+}
+
+pub(crate) fn select_is_err_version_not_found(err: &SelectStorageError) -> bool {
+    rustfs_ecstore::error::is_err_version_not_found(err)
+}