client

type EthClient interface {
	CallContract(ctx context.Context, msg ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)
	CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error)

	HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)

	BalanceAt(ctx context.Context, account common.Address, number *big.Int) (*big.Int, error)
	FilterLogs(ctx context.Context, query ethereum.FilterQuery) ([]types.Log, error)
	SubscribeFilterLogs(ctx context.Context, query ethereum.FilterQuery,
		ch chan<- types.Log) (ethereum.Subscription, error)
}

type GethClient interface {
	GetProof(ctx context.Context, account common.Address, keys []string,
		blockNumber *big.Int) (*gethclient.AccountResult, error)
}

type SlackAPIResponse struct {
	Ok  bool   `json:"ok"`
	Err string `json:"error"`
}

type SlackClient interface {
	PostData(context.Context, string) (*SlackAPIResponse, error)
}

type SlackPayload struct {
	Text interface{} `json:"text"`
}