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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. Stjepan Glavina‏ @stjepang Mar 22
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      How I want to simplify async filesystem APIs... 1/13

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    2. Stjepan Glavina‏ @stjepang Mar 22
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      First, take a look at the filesystem APIs in async-std and tokio: 2/13 https://docs.rs/async-std/1.5.0/async_std/fs/index.html … https://docs.rs/tokio/0.2.13/tokio/fs/index.html …pic.twitter.com/KqHynp6smb

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    3. Stjepan Glavina‏ @stjepang Mar 22
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      Both async-std and tokio are reimplementing the whole std::fs in an async manner. But can we invent some kind of async adapter for std::fs instead of replacing it entirely? 3/13

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    4. Stjepan Glavina‏ @stjepang Mar 22
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      Consider a function like tokio::fs::read_to_string(). Do we really need it? 4/13 https://docs.rs/tokio/0.2.13/tokio/fs/fn.read_to_string.html …pic.twitter.com/8X85P1j2D5

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    5. Stjepan Glavina‏ @stjepang Mar 22
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      Imagine there was a blocking!() macro that offloads a piece of code onto the blocking pool, kind of like spawn_blocking() with a nicer syntax. Then we could simply use std::fs::read_to_string() inside this macro. 5/13pic.twitter.com/GTjnEdHXrq

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    6. Stjepan Glavina‏ @stjepang Mar 22
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      That's actually not too bad! If we have the blocking!() macro, we don't really need async versions of any of the standalone functions in the std::fs module. 6/13

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    7. Stjepan Glavina‏ @stjepang Mar 22
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      What about the File type, though? In the vast majority of uses, files are only read or only written. Seeking is not a very common operation - in fact, I'd say seeking is a vestigial function that is now superseded by read_at()/write_at() functions. 7/13

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    8. yosh‏ @yoshuawuyts Mar 22
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      Replying to @stjepang

      read_at/write_at are Linux only though. Being able to seek asynchronously is essential for anything requiring random-access reads/writes cross-platform. This is common in for example databases. Calling it "vestigial" doesn't sound quite right. https://doc.rust-lang.org/std/fs/struct.File.html?search=read_at …

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    9. Stjepan Glavina‏ @stjepang Mar 22
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      Replying to @yoshuawuyts

      They're not Linux-only - read_at/write_at exist on all Unix systems, including macOS/iOS/Android/etc. And Windows has similar functions called seek_read/seek_write: https://doc.rust-lang.org/std/os/windows/fs/trait.FileExt.html#tymethod.seek_read … https://doc.rust-lang.org/std/os/windows/fs/trait.FileExt.html#tymethod.seek_write …

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      yosh‏ @yoshuawuyts Mar 22
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      Replying to @stjepang

      Oh yeah, my bad: Unix. But that presents two choices: either drop Windows (or Unix) support. Or cfg_if between the two. There probably should be a cross-platform variant, perhaps that *is* Seek, but in its absence the end-user experience is not good enough to drop Seek rn.

      6:54 AM - 22 Mar 2020
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