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exchange.go
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exchange.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"
)
type Currency string
const (
USD Currency = "USD"
)
// Exchange is an interface for getting current and historical prices
// for a given coin and currency. Supports multiple exchanges.
type Exchange interface {
// CurrentPrice returns the current price of a coin
CurrentPrice(coin ChainType, currency Currency) (ExchangePrice, error)
// GetHistoricalPrice returns the price of a coin at a given time
HistoricalPrice(coin ChainType, currency Currency, received time.Time) (ExchangePrice, error)
}
type ExchangePrice struct {
Value float64 `json:"price,omitempty"`
Currency string `json:"currency,omitempty"`
Coin string `json:"coin,omitempty"`
Time time.Time `json:"time,omitempty"`
}
type CryptoCompareExchange struct {
BaseUrl string
ApiKey string
Version int
}
type CryptoCompareTickerResponse struct {
Data struct {
ETHUSD struct {
Type string `json:"TYPE"`
Market string `json:"MARKET"`
Instrument string `json:"INSTRUMENT"`
Ccseq int `json:"CCSEQ"`
Value float64 `json:"VALUE"`
ValueFlag string `json:"VALUE_FLAG"`
ValueLastUpdateTs int `json:"VALUE_LAST_UPDATE_TS"`
ValueLastUpdateNs int `json:"VALUE_LAST_UPDATE_NS"`
LastUpdateQuantity float64 `json:"LAST_UPDATE_QUANTITY"`
LastUpdateQuoteQuantity float64 `json:"LAST_UPDATE_QUOTE_QUANTITY"`
LastUpdateCcseq int `json:"LAST_UPDATE_CCSEQ"`
CurrentHourVolume float64 `json:"CURRENT_HOUR_VOLUME"`
CurrentHourQuoteVolume float64 `json:"CURRENT_HOUR_QUOTE_VOLUME"`
CurrentHourOpen float64 `json:"CURRENT_HOUR_OPEN"`
CurrentHourHigh float64 `json:"CURRENT_HOUR_HIGH"`
CurrentHourLow float64 `json:"CURRENT_HOUR_LOW"`
CurrentHourTotalIndexUpdates int `json:"CURRENT_HOUR_TOTAL_INDEX_UPDATES"`
CurrentHourChange float64 `json:"CURRENT_HOUR_CHANGE"`
CurrentHourChangePercentage float64 `json:"CURRENT_HOUR_CHANGE_PERCENTAGE"`
CurrentDayVolume float64 `json:"CURRENT_DAY_VOLUME"`
CurrentDayQuoteVolume float64 `json:"CURRENT_DAY_QUOTE_VOLUME"`
CurrentDayOpen float64 `json:"CURRENT_DAY_OPEN"`
CurrentDayHigh float64 `json:"CURRENT_DAY_HIGH"`
CurrentDayLow float64 `json:"CURRENT_DAY_LOW"`
CurrentDayTotalIndexUpdates int `json:"CURRENT_DAY_TOTAL_INDEX_UPDATES"`
CurrentDayChange float64 `json:"CURRENT_DAY_CHANGE"`
CurrentDayChangePercentage float64 `json:"CURRENT_DAY_CHANGE_PERCENTAGE"`
CurrentWeekVolume float64 `json:"CURRENT_WEEK_VOLUME"`
CurrentWeekQuoteVolume float64 `json:"CURRENT_WEEK_QUOTE_VOLUME"`
CurrentWeekOpen float64 `json:"CURRENT_WEEK_OPEN"`
CurrentWeekHigh float64 `json:"CURRENT_WEEK_HIGH"`
CurrentWeekLow float64 `json:"CURRENT_WEEK_LOW"`
CurrentWeekTotalIndexUpdates int `json:"CURRENT_WEEK_TOTAL_INDEX_UPDATES"`
CurrentWeekChange float64 `json:"CURRENT_WEEK_CHANGE"`
CurrentWeekChangePercentage float64 `json:"CURRENT_WEEK_CHANGE_PERCENTAGE"`
CurrentMonthVolume float64 `json:"CURRENT_MONTH_VOLUME"`
CurrentMonthQuoteVolume float64 `json:"CURRENT_MONTH_QUOTE_VOLUME"`
CurrentMonthOpen float64 `json:"CURRENT_MONTH_OPEN"`
CurrentMonthHigh float64 `json:"CURRENT_MONTH_HIGH"`
CurrentMonthLow float64 `json:"CURRENT_MONTH_LOW"`
CurrentMonthTotalIndexUpdates int `json:"CURRENT_MONTH_TOTAL_INDEX_UPDATES"`
CurrentMonthChange float64 `json:"CURRENT_MONTH_CHANGE"`
CurrentMonthChangePercentage float64 `json:"CURRENT_MONTH_CHANGE_PERCENTAGE"`
CurrentYearVolume float64 `json:"CURRENT_YEAR_VOLUME"`
CurrentYearQuoteVolume float64 `json:"CURRENT_YEAR_QUOTE_VOLUME"`
CurrentYearOpen float64 `json:"CURRENT_YEAR_OPEN"`
CurrentYearHigh float64 `json:"CURRENT_YEAR_HIGH"`
CurrentYearLow float64 `json:"CURRENT_YEAR_LOW"`
CurrentYearTotalIndexUpdates int `json:"CURRENT_YEAR_TOTAL_INDEX_UPDATES"`
CurrentYearChange float64 `json:"CURRENT_YEAR_CHANGE"`
CurrentYearChangePercentage float64 `json:"CURRENT_YEAR_CHANGE_PERCENTAGE"`
Moving24HourVolume float64 `json:"MOVING_24_HOUR_VOLUME"`
Moving24HourQuoteVolume float64 `json:"MOVING_24_HOUR_QUOTE_VOLUME"`
Moving24HourOpen float64 `json:"MOVING_24_HOUR_OPEN"`
Moving24HourHigh float64 `json:"MOVING_24_HOUR_HIGH"`
Moving24HourLow float64 `json:"MOVING_24_HOUR_LOW"`
Moving24HourTotalIndexUpdates int `json:"MOVING_24_HOUR_TOTAL_INDEX_UPDATES"`
Moving24HourChange float64 `json:"MOVING_24_HOUR_CHANGE"`
Moving24HourChangePercentage float64 `json:"MOVING_24_HOUR_CHANGE_PERCENTAGE"`
Moving7DayVolume float64 `json:"MOVING_7_DAY_VOLUME"`
Moving7DayQuoteVolume float64 `json:"MOVING_7_DAY_QUOTE_VOLUME"`
Moving7DayOpen float64 `json:"MOVING_7_DAY_OPEN"`
Moving7DayHigh float64 `json:"MOVING_7_DAY_HIGH"`
Moving7DayLow float64 `json:"MOVING_7_DAY_LOW"`
Moving7DayTotalIndexUpdates int `json:"MOVING_7_DAY_TOTAL_INDEX_UPDATES"`
Moving7DayChange float64 `json:"MOVING_7_DAY_CHANGE"`
Moving7DayChangePercentage float64 `json:"MOVING_7_DAY_CHANGE_PERCENTAGE"`
Moving30DayVolume float64 `json:"MOVING_30_DAY_VOLUME"`
Moving30DayQuoteVolume float64 `json:"MOVING_30_DAY_QUOTE_VOLUME"`
Moving30DayOpen float64 `json:"MOVING_30_DAY_OPEN"`
Moving30DayHigh float64 `json:"MOVING_30_DAY_HIGH"`
Moving30DayLow float64 `json:"MOVING_30_DAY_LOW"`
Moving30DayTotalIndexUpdates int `json:"MOVING_30_DAY_TOTAL_INDEX_UPDATES"`
Moving30DayChange float64 `json:"MOVING_30_DAY_CHANGE"`
Moving30DayChangePercentage float64 `json:"MOVING_30_DAY_CHANGE_PERCENTAGE"`
Moving90DayVolume float64 `json:"MOVING_90_DAY_VOLUME"`
Moving90DayQuoteVolume float64 `json:"MOVING_90_DAY_QUOTE_VOLUME"`
Moving90DayOpen float64 `json:"MOVING_90_DAY_OPEN"`
Moving90DayHigh float64 `json:"MOVING_90_DAY_HIGH"`
Moving90DayLow float64 `json:"MOVING_90_DAY_LOW"`
Moving90DayTotalIndexUpdates int `json:"MOVING_90_DAY_TOTAL_INDEX_UPDATES"`
Moving90DayChange float64 `json:"MOVING_90_DAY_CHANGE"`
Moving90DayChangePercentage float64 `json:"MOVING_90_DAY_CHANGE_PERCENTAGE"`
Moving180DayVolume float64 `json:"MOVING_180_DAY_VOLUME"`
Moving180DayQuoteVolume float64 `json:"MOVING_180_DAY_QUOTE_VOLUME"`
Moving180DayOpen float64 `json:"MOVING_180_DAY_OPEN"`
Moving180DayHigh float64 `json:"MOVING_180_DAY_HIGH"`
Moving180DayLow float64 `json:"MOVING_180_DAY_LOW"`
Moving180DayTotalIndexUpdates int `json:"MOVING_180_DAY_TOTAL_INDEX_UPDATES"`
Moving180DayChange float64 `json:"MOVING_180_DAY_CHANGE"`
Moving180DayChangePercentage float64 `json:"MOVING_180_DAY_CHANGE_PERCENTAGE"`
Moving365DayVolume float64 `json:"MOVING_365_DAY_VOLUME"`
Moving365DayQuoteVolume float64 `json:"MOVING_365_DAY_QUOTE_VOLUME"`
Moving365DayOpen float64 `json:"MOVING_365_DAY_OPEN"`
Moving365DayHigh float64 `json:"MOVING_365_DAY_HIGH"`
Moving365DayLow float64 `json:"MOVING_365_DAY_LOW"`
Moving365DayTotalIndexUpdates int `json:"MOVING_365_DAY_TOTAL_INDEX_UPDATES"`
Moving365DayChange float64 `json:"MOVING_365_DAY_CHANGE"`
Moving365DayChangePercentage float64 `json:"MOVING_365_DAY_CHANGE_PERCENTAGE"`
LifetimeFirstUpdateTs int `json:"LIFETIME_FIRST_UPDATE_TS"`
LifetimeVolume float64 `json:"LIFETIME_VOLUME"`
LifetimeQuoteVolume float64 `json:"LIFETIME_QUOTE_VOLUME"`
LifetimeOpen float64 `json:"LIFETIME_OPEN"`
LifetimeHigh float64 `json:"LIFETIME_HIGH"`
LifetimeHighTs int `json:"LIFETIME_HIGH_TS"`
LifetimeLow float64 `json:"LIFETIME_LOW"`
LifetimeLowTs int `json:"LIFETIME_LOW_TS"`
LifetimeTotalIndexUpdates int `json:"LIFETIME_TOTAL_INDEX_UPDATES"`
LifetimeChange float64 `json:"LIFETIME_CHANGE"`
LifetimeChangePercentage float64 `json:"LIFETIME_CHANGE_PERCENTAGE"`
} `json:"ETH-USD"`
} `json:"Data"`
Err struct {
} `json:"Err"`
}
func NewHttpClientWithTimeout(time time.Duration) (*http.Client, error) {
client := &http.Client{
Timeout: time,
}
return client, nil
}
func NewCryptoCompareExchange(apiKey string) (Exchange, error) {
if apiKey == "" {
return nil, errors.New("api key is required")
}
return CryptoCompareExchange{
ApiKey: apiKey,
BaseUrl: "https://data-api.cryptocompare.com", // v2 api
}, nil
}
func (c CryptoCompareExchange) CurrentPrice(coin ChainType, currency Currency) (ExchangePrice, error) {
price := ExchangePrice{
Coin: coin.Short(),
Currency: currency.String(),
Time: time.Now(),
}
httpClient, err := NewHttpClientWithTimeout(time.Duration(2 * time.Second))
if err != nil {
return price, err
}
path := "index/cc/v1/latest/tick"
url := fmt.Sprintf("%s/%s?market=ccix&instruments=%s-%s", c.BaseUrl, path, coin.Short(), currency.String())
req, err := httpClient.Get(url)
if err != nil {
return price, err
}
defer req.Body.Close()
res, err := io.ReadAll(req.Body)
if err != nil {
return price, err
}
var response CryptoCompareTickerResponse
err = json.Unmarshal(res, &response)
if err != nil {
return price, err
}
price.Value = response.Data.ETHUSD.CurrentDayOpen
return price, nil
}
func (c CryptoCompareExchange) HistoricalPrice(coin ChainType, currency Currency, received time.Time) (ExchangePrice, error) {
price := ExchangePrice{
Coin: coin.Short(),
Currency: currency.String(),
Time: received,
}
httpClient, err := NewHttpClientWithTimeout(time.Duration(2 * time.Second))
if err != nil {
return price, err
}
path := "index/cc/v1/historical/minutes"
limit := 20
fmt.Println(received)
// conver the time.Time to unix timestamp
unixTime := received.UTC().Unix()
url := fmt.Sprintf("%s/%s?market=ccix&instrument=%s-%s&limit=%d&to_ts=%d", c.BaseUrl, path, coin.Short(), currency.String(), limit, unixTime)
fmt.Println(unixTime)
fmt.Println(url)
req, err := httpClient.Get(url)
if err != nil {
return price, err
}
defer req.Body.Close()
res, err := io.ReadAll(req.Body)
if err != nil {
return price, err
}
var response CryptoCompareTickerResponse
err = json.Unmarshal(res, &response)
if err != nil {
return price, err
}
price.Value = response.Data.ETHUSD.CurrentDayOpen
return price, nil
}
func (c ChainType) Short() string {
switch c {
case Ethereum:
return "ETH"
default:
return ""
}
}
func (c Currency) String() string {
return string(c)
}