price pipeline

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/pipeline/yahoo.go

@@ -0,0 +1,55 @@
+package pipeline
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type yahooChart struct {
+	Chart struct {
+		Result []struct {
+			Meta struct {
+				RegularMarketPrice float64 `json:"regularMarketPrice"`
+				Currency           string  `json:"currency"`
+			} `json:"meta"`
+		} `json:"result"`
+		Error *struct{ Description string } `json:"error"`
+	} `json:"chart"`
+}
+
+// FetchYahooPrice récupère le dernier prix connu pour un ticker Yahoo Finance.
+func FetchYahooPrice(ctx context.Context, ticker string) (float64, error) {
+	url := fmt.Sprintf(
+		"https://query1.finance.yahoo.com/v8/finance/chart/%s?interval=1d&range=1d", ticker)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return 0, err
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return 0, err
+	}
+	defer resp.Body.Close()
+
+	var chart yahooChart
+	if err := json.NewDecoder(resp.Body).Decode(&chart); err != nil {
+		return 0, fmt.Errorf("decode yahoo response: %w", err)
+	}
+	if chart.Chart.Error != nil {
+		return 0, fmt.Errorf("yahoo error: %s", chart.Chart.Error.Description)
+	}
+	if len(chart.Chart.Result) == 0 {
+		return 0, fmt.Errorf("no result for ticker %s", ticker)
+	}
+
+	price := chart.Chart.Result[0].Meta.RegularMarketPrice
+	if price == 0 {
+		return 0, fmt.Errorf("zero price for ticker %s", ticker)
+	}
+	return price, nil
+}