ripple.go

package cryptocoins

import (
	"encoding/json"
	"io/ioutil"
	"net/http"
	"strconv"

	"github.com/dgellow/cryptofolio/pkg/domain"
)

type RippleService struct{}

var _ BalancesFetcher = &RippleService{}

func NewRippleService() *RippleService {
	return &RippleService{}
}

func (s *RippleService) FetchBalances(addr string) ([]domain.Balance, error) {
	// See https://ripple.com/build/data-api-v2/#get-account-balances
	resp, err := http.Get(
		"https://data.ripple.com/v2/accounts/" + addr + "/balances",
	)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var b struct {
		Balances []struct {
			Currency string `json:"currency"`
			Value    string `json:"value"`
		} `json:"balances"`
		Result string `json:"result"`
	}

	err = json.Unmarshal(body, &b)
	if err != nil {
		return nil, err
	}

	balances := []domain.Balance{}
	for _, bal := range b.Balances {
		value, err := strconv.ParseFloat(bal.Value, 64)
		if err != nil {
			return nil, err
		}

		// FIXME: Amount should be correctly represented
		// without decimal, and use the correct Unit.
		balances = append(balances, domain.Balance{
			Amount:   uint64(value),
			Currency: "XRP (rounded value)",
			Unit:     1,
		})
	}

	return balances, nil
}