commit inicial do projeto

internal/oracle/fetcher.go

@@ -0,0 +1,59 @@
+package oracle
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+// OracleData representa um dado externo coletado via oráculo
+type OracleData struct {
+	Source string    `json:"source"`
+	Key    string    `json:"key"`
+	Value  float64   `json:"value"`
+	Time   time.Time `json:"timestamp"`
+}
+
+// FetchFromMock simula obtenção de dados de um oráculo externo (mock)
+func FetchFromMock(key string) (*OracleData, error) {
+	mockPrices := map[string]float64{
+		"USD-BRL": 5.06,
+		"ETH-BRL": 18732.42,
+		"IMOVEL-ABC123": 950000.00,
+	}
+	val, ok := mockPrices[key]
+	if !ok {
+		return nil, errors.New("dado não encontrado no mock")
+	}
+	return &OracleData{
+		Source: "mock",
+		Key:    key,
+		Value:  val,
+		Time:   time.Now(),
+	}, nil
+}
+
+// FetchFromCoinGecko busca o preço de uma moeda em relação ao BRL
+func FetchFromCoinGecko(coin string) (*OracleData, error) {
+	url := fmt.Sprintf("https://api.coingecko.com/api/v3/simple/price?ids=%s&vs_currencies=brl", coin)
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var parsed map[string]map[string]float64
+	if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
+		return nil, err
+	}
+	price := parsed[coin]["brl"]
+
+	return &OracleData{
+		Source: "coingecko",
+		Key:    coin + "-BRL",
+		Value:  price,
+		Time:   time.Now(),
+	}, nil
+}