price pipeline

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

internal/pipeline/coingecko.go

@@ -0,0 +1,88 @@
+package pipeline
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// ResolveCryptoID résout un ticker crypto (ex: "BTC") en ID CoinGecko (ex: "bitcoin").
+func ResolveCryptoID(ctx context.Context, apiKey, ticker string) (string, error) {
+	url := fmt.Sprintf("https://api.coingecko.com/api/v3/search?query=%s", ticker)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return "", err
+	}
+	if apiKey != "" {
+		req.Header.Set("x-cg-pro-api-key", apiKey)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	var result struct {
+		Coins []struct {
+			ID     string `json:"id"`
+			Symbol string `json:"symbol"`
+		} `json:"coins"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return "", fmt.Errorf("decode coingecko search: %w", err)
+	}
+
+	// Le premier résultat dont le symbol correspond exactement est le bon
+	upper := strings.ToUpper(ticker)
+	for _, coin := range result.Coins {
+		if strings.ToUpper(coin.Symbol) == upper {
+			return coin.ID, nil
+		}
+	}
+	return "", fmt.Errorf("no coingecko match for ticker %s", ticker)
+}
+
+// FetchCoinGeckoPrices récupère les prix EUR pour une liste d'IDs CoinGecko.
+// Le ticker stocké dans instrument_ticker_cache doit être l'ID CoinGecko (ex: "bitcoin", "ethereum").
+func FetchCoinGeckoPrices(ctx context.Context, apiKey string, coinIDs []string) (map[string]float64, error) {
+	if len(coinIDs) == 0 {
+		return map[string]float64{}, nil
+	}
+
+	baseURL := "https://api.coingecko.com/api/v3/simple/price"
+	if apiKey != "" {
+		baseURL = "https://pro-api.coingecko.com/api/v3/simple/price"
+	}
+
+	url := fmt.Sprintf("%s?ids=%s&vs_currencies=eur", baseURL, strings.Join(coinIDs, ","))
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	if apiKey != "" {
+		req.Header.Set("x-cg-pro-api-key", apiKey)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	// Réponse : {"bitcoin": {"eur": 45000.0}, "ethereum": {"eur": 2500.0}}
+	var raw map[string]map[string]float64
+	if err := json.NewDecoder(resp.Body).Decode(&raw); err != nil {
+		return nil, fmt.Errorf("decode coingecko response: %w", err)
+	}
+
+	prices := make(map[string]float64, len(raw))
+	for id, currencies := range raw {
+		prices[id] = currencies["eur"]
+	}
+	return prices, nil
+}