Module opendal::raw::oio::into_reader

into_reader will provide different implementations to convert into oio::Read

• (Some(offset), Some(size)) => by_range
• (Some(offset), None) => by_offset
• (None, Some(size)) => by_tail
• (None, None) => by_offset

The main different is whether and when to call stat to get total content length.

TODO

We only implement by_range so far.

We should implement other types so that they can be zero cost on non-seek cases.

For example, for by_full, we don’t need to do stat everytime. If user call poll_read first, we can get the total_size from returning reader. In this way, we can save 40ms in average for every s3 read call.

Structs

FdReader

FdReader is a wrapper of input fd to implement oio::Read.

RangeReader

RangeReader that can do seek on non-seekable reader.

Functions

by_range

Convert given reader into oio::Reader by range.

from_fd

Convert given fd into oio::Reader.