nim-ethers/ethers/errors.nim

import pkg/contractabi/selector
import ./basics

type SolidityError* = object of EthersError

{.push raises:[].}

template errors*(types) {.pragma.}

func decode*[E: SolidityError](_: type E, data: seq[byte]): ?!(ref E) =
  const name = $E
  const selector = selector(name, typeof(()))
  if data.len < 4:
    return failure "unable to decode " & name & ": signature too short"
  if selector.toArray[0..<4] != data[0..<4]:
    return failure "unable to decode " & name & ": signature doesn't match"
  success (ref E)()

template convertCustomErrors*[ErrorTypes: tuple](body: untyped): untyped =
  try:
    body
  except ProviderError as error:
    block:
      if data =? error.data:
        for e in ErrorTypes.default.fields:
          if error =? typeof(e).decode(data):
            raise error
      raise error