pub trait FileContentSource {
// Required method
fn read_prefix(
&self,
path: &str,
max_bytes: u64,
) -> Result<FileContent, ContentError>;
}Expand description
Where the association pass gets file bytes.
A trait so the association logic is pure and testable without a filesystem, so a future source backend that can re-materialize its own content (an archive member, a container layer) can supply it without this module learning about that backend, and so a caller that owns a retry policy can wrap the implementation instead of this module growing a loop.
Required Methods§
Sourcefn read_prefix(
&self,
path: &str,
max_bytes: u64,
) -> Result<FileContent, ContentError>
fn read_prefix( &self, path: &str, max_bytes: u64, ) -> Result<FileContent, ContentError>
Read at most max_bytes from path, or say why not.
§Errors
Returns ContentError when the file cannot be opened, cannot be read,
or its prefix is not valid UTF-8.
Dyn Compatibility§
This trait is dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".