Added First Metrics

metrics.go

@@ -0,0 +1,46 @@
+package tastytrade
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+)
+
+type MarketMetricInfo struct {
+	Symbol                           string   `json:"symbol"`
+	ImpliedVolatilityIndex           float32   `json:"implied-volatility-index"`
+	ImpliedVolatilityIndex5DayChange float32   `json:"implied-volatility-index-5-day-change"`
+	ImpliedVolatilityRank            float32   `json:"implied-volatility-rank"`
+	ImpliedVolatilityPercentile      float32   `json:"implied-volatility-percentile"`
+	Liquidity                        float32   `json:"liquidity"`
+	LiquidityRank                    float32   `json:"liquidity-rank"`
+	LiquidityRating                  int32   `json:"liquidity-rating"`
+	OptionExpirationImpliedVolatilities []struct {
+		ExpirationDate string `json:"expiration-date"`
+		SettlementType string `json:"settlement-type"`
+		OptionChainType string `json:"option-chain-type"`
+		ImpliedVolatility float64 `json:"implied-volatility"`
+	} `json:"option-expiration-implied-volatilities"`
+}
+
+func (api *TastytradeAPI) GetMarketMetricInfo(symbol string) (MarketMetricInfo, error) {
+	urlVal := fmt.Sprintf("%s/market-metrics/%s", api.host, url.PathEscape(symbol))
+	data, err := api.fetchData(urlVal)
+	if err != nil {
+		return MarketMetricInfo{}, err
+	}
+
+	var response MarketMetricInfo
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return MarketMetricInfo{}, err
+	}
+
+	err = json.Unmarshal(jsonData, &response)
+	if err != nil {
+		return MarketMetricInfo{}, err
+	}
+
+	return response, nil
+}
+