CodesOnChain.Contracts.RMUDLottery.ex

CodesOnChain.Contracts.RMUDLottery.ex

defmodule CodesOnChain.Contracts.RMUDLottery do
    @moduledoc """
        the interact with RMUDLottery on mappo chain.
        > https://mainnet.optimism.io
        > 10
        > https://explorer.optimism.io
    """

        alias Ethereumex.HttpClient
    alias Components.Transaction
    require Logger

    @endpoint "https://rpc.maplabs.io"
    @chain_id 10
    @contract_addr "0xed8b05159460c900f12075c3b901ca274fd7486f"
    @func %{
        balance_of: "balanceOf(address)",
    }
    @gas_limit 1_000_000

    def get_module_doc, do: @moduledoc

    def if_bigger_than(addr, num) do
        num_dec = Decimal.new("#{num}")
        not Decimal.lt?(balance_of(addr), num_dec)
        # bigger or eq
    end
    def balance_of(addr) do
        # addr_bin
        addr_bin = TypeTranslator.addr_to_bin(addr)
        # get data
        data = TypeTranslator.get_data(@func.balance_of, [addr_bin])
        # get raw response
        {:ok, raw} = 
            HttpClient.eth_call(
                %{
                data: data,
                to: @contract_addr
            }, 
            "latest", 
            [url: @endpoint, request_timeout: 1000]
            )
        # decode
        [balance] = 
            raw
            |> Binary.drop(2)
            |> Base.decode16!(case: :lower)
            |> ABI.TypeDecoder.decode_raw([{:uint, 256}])
        balance
        |> Decimal.div(1_000_000_000_000_000_000)
    end
end