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neon/pageserver
Arpad Müller 5e00c44169 Add WriteBlobWriter buffering and make VirtualFile::{write,write_all} async (#5203)
## Problem

We want to convert the `VirtualFile` APIs to async fn so that we can
adopt one of the async I/O solutions.

## Summary of changes

This PR is a follow-up of #5189, #5190, and #5195, and does the
following:

* Move the used `Write` trait functions of `VirtualFile` into inherent
functions
* Add optional buffering to `WriteBlobWriter`. The buffer is discarded
on drop, similarly to how tokio's `BufWriter` does it: drop is neither
async nor does it support errors.
* Remove the generics by `Write` impl of `WriteBlobWriter`, alwaays
using `VirtualFile`
* Rename `WriteBlobWriter` to `BlobWriter`
* Make various functions in the write path async, like
`VirtualFile::{write,write_all}`.

Part of #4743.
2023-09-06 18:17:12 +02:00
..