feat: user consent setting and retrieving (NOTE: does not affect recording yet)

src/operator_ext.rs

@@ -0,0 +1,24 @@
+use extension_traits::extension;
+use opendal::{Buffer, Error, ErrorKind, FuturesAsyncReader, Operator};
+
+#[extension(pub trait OperatorExt)]
+impl Operator {
+    async fn read_if_exists(&self, path: &str) -> Result<Option<Buffer>, Error> {
+        match self.read(path).await {
+            Ok(buffer) => Ok(Some(buffer)),
+            Err(error) if matches!(error.kind(), ErrorKind::NotFound) => Ok(None),
+            Err(error) => Err(error),
+        }
+    }
+
+    async fn async_reader_if_exists(
+        &self,
+        path: &str,
+    ) -> Result<Option<FuturesAsyncReader>, Error> {
+        match self.reader(path).await {
+            Ok(reader) => Ok(Some(reader.into_futures_async_read(..).await?)),
+            Err(error) if matches!(error.kind(), ErrorKind::NotFound) => Ok(None),
+            Err(error) => Err(error),
+        }
+    }
+}