Xuanwo commented on issue #5425:
URL: https://github.com/apache/opendal/issues/5425#issuecomment-2781462998
I'm thinking about this for a while. One possible idea is we can store an
`LazyCell` in `Reader` which can only be filled once users start a real read.
There are two possible API design:
```rust
impl Reader {
fn metadata(&self) -> Option<&Metadata>;
async fn metadata(&self) -> &Metadata;
}
```
for `fn metadata(&self) -> Option<&Metadata>`:
Reader always return `None` if we don't know about it, otherwise returns
`Some(&Metadata)`.
This one is super clear but might be a bit not useful.
for `async fn metadata(&self) -> &Metadata`:
Reader can start a `stat` call internally if the metadata is not know yet.
This one is easy to use but have the following two problems:
- Hidden API call happened.
- `stat` can return error but there is no way to handle it.
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