feat: Make fmt_short return an impl Display so we can avoid an allocation.#3460
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feat: Make fmt_short return an impl Display so we can avoid an allocation.#3460
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Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/3460/docs/iroh/ Last updated: 2025-09-22T09:28:03Z |
flub
reviewed
Sep 19, 2025
iroh-base/src/key.rs
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| pub const LENGTH: usize = ed25519_dalek::PUBLIC_KEY_LENGTH; | ||
| } | ||
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| struct PublicKeyShort(PublicKey); |
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The old code used space for 10 bytes on the heap. This version uses 32 bytes on the stack?
I think it's a great idea to try and get rid of the heap allocation. But maybe you can give PublicKeyShort only the 5 bytes needed for the display?
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Yes, you could do that easily. PublicKeyShort is not part of the public API, so you can optimize it.
flub
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Sep 22, 2025
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Thanks! I think the optimisation of only copying 5 bytes is worth it here.
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Description
Currently, fmt_short allocates a String. It is used quite a few times in trace! statements. This makes it not allocate.
Not sure if it is worth it.
Breaking Changes
Notes & open questions
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