Chain Connection

For blockchain communication we need an ethclient.Client and a ContractBackend. The ethclient.Client is the communicator on which the ContractBackend is built for go-perun to interact with the on-chain contracts. You can create an ethclient.Client by calling ethclient.Dial with the URL of the node to connect. The ContractBackend is constructed from the ethclient.Client in combination with the Transactor from the previous step:

func connectToChain(transactor ethchannel.Transactor) (client *ethclient.Client, cb ethchannel.ContractBackend, err error) {
	client, err = ethclient.Dial(cfg.chainURL)
	if err != nil {
		return
	}

	return client, ethchannel.NewContractBackend(client, transactor), nil
}

Note

You can dial any RPC Ethereum node here, even an Infura endpoint.