crossover

backend-go/internal/config/config.go

@@ -0,0 +1,79 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Config struct {
+	Port              int
+	DatabaseURL       string
+	DBHost            string
+	DBPort            int
+	DBUser            string
+	DBPassword        string
+	DBName            string
+	FirebaseProjectID string
+	EthRPCURL         string
+	PollIntervalMS    int
+	NodeEnv           string
+}
+
+func Load() (*Config, error) {
+	cfg := &Config{
+		Port:           getEnvInt("PORT", 3001),
+		DatabaseURL:    os.Getenv("DATABASE_URL"),
+		DBHost:         getEnv("DB_HOST", "localhost"),
+		DBPort:         getEnvInt("DB_PORT", 5432),
+		DBUser:         os.Getenv("DB_USER"),
+		DBPassword:     os.Getenv("DB_PASSWORD"),
+		DBName:         os.Getenv("DB_NAME"),
+		FirebaseProjectID: os.Getenv("FIREBASE_PROJECT_ID"),
+		EthRPCURL:      os.Getenv("ETH_RPC_URL"),
+		PollIntervalMS: getEnvInt("POLL_INTERVAL_MS", 60000),
+		NodeEnv:        getEnv("NODE_ENV", "development"),
+	}
+
+	if cfg.PollIntervalMS < 1000 {
+		return nil, fmt.Errorf("POLL_INTERVAL_MS must be >= 1000, got %d", cfg.PollIntervalMS)
+	}
+
+	return cfg, nil
+}
+
+func (c *Config) DSN() string {
+	if c.DatabaseURL != "" {
+		// pgx defaults to sslmode=prefer, which fails against local Postgres.
+		// Append sslmode=disable if not already specified.
+		if !strings.Contains(c.DatabaseURL, "sslmode=") {
+			sep := "?"
+			if strings.Contains(c.DatabaseURL, "?") {
+				sep = "&"
+			}
+			return c.DatabaseURL + sep + "sslmode=disable"
+		}
+		return c.DatabaseURL
+	}
+	return fmt.Sprintf(
+		"host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
+		c.DBHost, c.DBPort, c.DBUser, c.DBPassword, c.DBName,
+	)
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}
+
+func getEnvInt(key string, fallback int) int {
+	if v := os.Getenv(key); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			return n
+		}
+	}
+	return fallback
+}