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I have a library which contains a function concat - it can merge two bytes. I have deployed a contract which uses that library and it works. I would like to make a simple bytes builder on my website. Do I need to deploy a special contract BytesBuilder or can I simply call the already deployed library and call lib.concat somehow?

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  • I believe that if the function is public in the library then it is also public in the contract, and therefore you can call it via the contract. Have you tried?
    – goodvibration
    Sep 1, 2019 at 11:13
  • Yes, my contract communicates with library with success. My question was can I exclude the contract and just call the library which has already been deployed and call function to build bytes, or have I to deploy another contract, add some more functions for builder and deploy again.
    – Radek_pl
    Sep 1, 2019 at 11:21
  • I guess there is a misunderstanding, sorry. Let me explain. I can't use my contract I already have deployed because it implements the library only for it's internal use: I call the function with bytes put as parameter and it grabs it and splits to necessary chunks and performs other work with them - it works perfectly. Then I found out I could make an external bytes builder generator on my website. The library has ready to go functions to merge bytes, but the contract doesn't, it only reads and parses. I was thinking if I could still use that library to make a builder.
    – Radek_pl
    Sep 1, 2019 at 11:36
  • So there is no misunderstanding here. As I stated in my first comment - if the function is public in the library, then you can call it via the contract which you have already deployed. Otherwise, you'd need to expose it in a new contract (either by declaring it public this time, or by providing a public function in the new contract, which will call the internal function in the library).
    – goodvibration
    Sep 1, 2019 at 11:39
  • By the way, for an "external bytes builder generator on my website", you don't need neither a contract nor a library (i.e., you don't need anything on the blockchain). You can get it done with a simple usage of web3.utils. It will also work much faster (no RPC involved).
    – goodvibration
    Sep 1, 2019 at 11:56

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