I'm working on a Dapp for voting in a municipality and national election. There is a lot of code, and I've met the max limit of the contract size many times but have been able to keep it under the limit by cutting down functions, compress requires error text, move internal functions inline, and other small fixes to reduce size. But now, even if I do everything as efficiently as possible, I still go over the limit, and I'm not done with the Dapp yet. I've used this doc to reduce size: "https://ethereum.org/en/developers/tutorials/downsizing-contracts-to-fight-the-contract-size-limit/#remove-functions" I'm now looking into splitting the contracts into smaller contracts or making a library, but splitting the contracts into smaller ones OR creating a library, still gives the same problem when migrating in truffle. I've read that when using a library, I should avoid internal functions because they are included in the main contract instead of being used from the outside.

If you want to look at my code, check out our repo here: "https://github.com/voljumet/ChainVote/tree/libbie-1" (we have commented out some of the functions to be able to migrate)

Edit: The question: how to use a library, and if I'm doing it correctly, is there something with testing it in truffle that causes the contract to exceed the maximum size?

  • What's the question?
    – Ismael
    Apr 8, 2021 at 22:59
  • 1
    added the question at the end
    – Voljum
    Apr 9, 2021 at 11:58
  • A few tips for space reduction: 1/ Replace string with bytes32 (for small or constant strings), 2/ Use SafeMath only with user input, for small numbers under your control it adds gas unnecessarily. To ensure a function from a library wont be inline mark them as external.
    – Ismael
    Apr 13, 2021 at 13:34
  • Thanks, but I still cant lower the cost even if I make them external. But removed some SafeMath and got a little bit of reduction
    – Voljum
    Apr 14, 2021 at 20:09


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