add specialized Buf::chunks_vectored for Take
#617
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Just noticed this is a duplicate of #476. Don't have a strong opinion here, please feel free to review and merge either :) |
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Thank you. This got lost, sorry about that. I'm rebasing it and tweaking it myself since it's been so long. |
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The test was failing because this is writing to the extra slots in |
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The
h2crate usesTakearound the data frames to enforce a maximum frame size, which breaks vectored writes sinceTakedoesn't provide a specializedchunks_vectoredthat calls the underlyingchunks_vectored.To make this work with truncating individual
IoSlices, I needed to resort to a tiny bit ofunsafecode. There is a PR open (rust-lang/rust#111277) which will alleviate the need for it, but that hasn't landed yet (so unlikely to be stable any time soon).An alternative could be to just remove rather than truncate any
IoSlicethat crosses the limit threshold, which could be accomplished without any unsafe code. However, that might break the following guarantee documented onchunks_vectored: "If chunk_vectored does not fill every entry in dst, then dst is guaranteed to contain all remaining slices in `self."Happy to go either route, let me know what you think!