How to call RPC endpoints using ethclient.Client ( https://github.com/ethereum/go-ethereum )?
Some methods don't have wrappers, and, as far as i can see, calling it directly is impossible e.g.
client, err := ethclient.Dial(url)
// ok
client.BalanceAt(...)
// incorrect code, trying to access private field `c *rpc.Client`
client.c.Call("debug_traceTransaction", ...)
The only way i can think of is spinning up totally separate rpc client and keep both running at all times. Is this the only way?
The ethclient.Dial function (which you mentioned) uses the rpc.DialContext function underneath, and the package also provides an ethclient.NewClient function to create a new ethclient.Client with an existing rpc connection.
A possible solution could be to create a new rpc connection, then pass it to the ethclient.Client, so you're using one connection, but can use the RPC connection itself and the eth client as well.
Something like this:
rpcClient, err := rpc.DialContext(ctx, url)
ethClient := ethclient.NewClient(rpcClient)
// use the ethClient
ethClient.BalanceAt(...)
// access to rpc client
rpcClient.Call(...)