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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. Chris Dickinson‏ @isntitvacant May 4
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      ok, time to rubber duck twitter I have a "readable storage" trait that takes a name of a package and returns None or Some(AsyncBufRead). at my Tide handler level, this readable store is my state. My handler grabs the store, asks it for a pkg, and if we have one, streams it out.

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    2. Chris Dickinson‏ @isntitvacant May 4
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      so far, so good. now, because tide requires the response to be AsyncBufRead + Send + Sync, I put that requirement on my readable stores associated return types as well.

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    3. Chris Dickinson‏ @isntitvacant May 4
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      (I don’t think too closely about why the Response::body method requires a Sync AsyncRead param. This turns out to cause pain in my immediate future. No pun intended.)

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    4. Chris Dickinson‏ @isntitvacant May 4
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      Things are going fine — I have a store for reading from a remote registry using surf, and one for reading through a redis cache, all using async_std. Buoyed by this success, I start digging into S3.

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    5. Chris Dickinson‏ @isntitvacant May 4
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      (With a lot of help,) I muddle towards a rusoto client that makes requests using surf. This may not be the most efficient, but! I’m happy with it. I wire it into a store. The s3 client returns responses with a ByteStream. Not a big problem — it has a method “into_async_read()”.

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    6. Chris Dickinson‏ @isntitvacant May 4
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      This method returns “impl tokio::io::AsyncRead+Send”, leading to my first q — because I have to specify my stores’ associated return type, I need to Box it into a trait object. (I think! I could be wrong!) Mischief managed, casting the Box works. Yay! However, ...

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    7. Chris Dickinson‏ @isntitvacant May 4
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      The mismatch between the Response (which needs a Send+Sync AsyncBufRead) and S3 (which returns an AsyncRead+Send, not Sync) means the handler can’t use my S3 store. Heck.

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    8. Chris Dickinson‏ @isntitvacant May 4
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      So, I have questions: why does the Tide response body need to be Sync? Why isn’t the S3 payload Sync? Can I glue this together, somehow?

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      yosh‏ @yoshuawuyts May 4
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      Replying to @isntitvacant

      The Tide Response body needs to be sync because else borrows over async bounds aren't possible. Surf didn't used to have Sync in the bound initially (my design) and folks ran into limitations almost immediately.

      8:32 PM - 4 May 2020 from Berlin, Germany
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      • Jubilee Kat Marchán 🍑🍑🍑
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        1. Chris Dickinson‏ @isntitvacant May 4
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          Replying to @yoshuawuyts

          A-ha — I think I ran into this a few months ago, when returning a surf response from a tide handler would generate a compiler message about Sync not being satisfied.

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