Convert from ether to wei using go-ethereum

Question

Is there any function in go-ethereum, which can convert values from ether to wei and vice-versa?

I should notice, that I'm not using geth as standalone app, I'm using go-ethereum as imported libraries to my golang app, so using console is not an option

I want to ask if go-etherum has some converter function inside it, or, probably, someone know other non-official library at go, which can convert Ethereum values.

Answer 1

Go-ethereum exposes the web3 API:

https://geth.ethereum.org/docs/interface/javascript-console

So, if amt is in ETH, you can do:

web3.utils.toWei(amt,'ether')

and

web3.utils.fromWei(amt, 'ether')

See:

https://web3js.readthedocs.io/en/v1.2.6/web3-utils.html#towei

Answer 2

Float*10^18 will overflow fairly quickly. I am using the following function:

func FloatTo18z(amount float64) *big.Int {
    s := fmt.Sprintf("%f", amount)
    a := strings.Split(s, ".")
    for i := 0; i < 18; i++ {
        if len(a) > 1 && len(a[1]) > i {
            a[0] += string(a[1][i])
        } else {
            a[0] += "0"
        }
    }
    b, ok := new(big.Int).SetString(a[0], 10)
    if !ok {
        panic("Could not set big.Int string for value " + s)
    }
    return b
}