add config package

internal/config/config.go

@@ -0,0 +1,100 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"time"
+)
+
+type Config struct {
+	DatabaseURL         string
+	Port                string
+	StorageDir          string
+	MaxFileSize         int64
+	RateLimit           float64
+	CORSOrigins         []string
+	GzipLevel           int
+	MaxConnections      int32
+	MinConnections      int32
+	ConnLifetime        time.Duration
+	ConnIdleTime        time.Duration
+	HealthCheckPeriod   time.Duration
+	DefaultStorageLimit int64
+}
+
+func Load() *Config {
+	return &Config{
+		DatabaseURL:         getEnv("DATABASE_URL", ""),
+		Port:                getEnv("PORT", "8080"),
+		StorageDir:          getEnv("STORAGE_DIR", "storage"),
+		MaxFileSize:         getEnvInt64("MAX_FILE_SIZE_MB", 100) * 1024 * 1024,
+		RateLimit:           getEnvFloat64("RATE_LIMIT", 20.0),
+		CORSOrigins:         getEnvSlice("CORS_ORIGINS", []string{"*"}),
+		GzipLevel:           getEnvInt("GZIP_LEVEL", 5),
+		MaxConnections:      getEnvInt32("DB_MAX_CONNECTIONS", 100),
+		MinConnections:      getEnvInt32("DB_MIN_CONNECTIONS", 10),
+		ConnLifetime:        getEnvDuration("DB_CONN_LIFETIME", time.Hour),
+		ConnIdleTime:        getEnvDuration("DB_CONN_IDLE_TIME", time.Minute),
+		HealthCheckPeriod:   getEnvDuration("DB_HEALTH_CHECK_PERIOD", 5*time.Second),
+		DefaultStorageLimit: getEnvInt64("DEFAULT_STORAGE_LIMIT_GB", 1) * 1024 * 1024 * 1024,
+	}
+}
+
+func getEnv(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}
+
+func getEnvInt(key string, defaultValue int) int {
+	if value := os.Getenv(key); value != "" {
+		if intValue, err := strconv.Atoi(value); err == nil {
+			return intValue
+		}
+	}
+	return defaultValue
+}
+
+func getEnvInt32(key string, defaultValue int32) int32 {
+	if value := os.Getenv(key); value != "" {
+		if intValue, err := strconv.ParseInt(value, 10, 32); err == nil {
+			return int32(intValue)
+		}
+	}
+	return defaultValue
+}
+
+func getEnvInt64(key string, defaultValue int64) int64 {
+	if value := os.Getenv(key); value != "" {
+		if intValue, err := strconv.ParseInt(value, 10, 64); err == nil {
+			return intValue
+		}
+	}
+	return defaultValue
+}
+
+func getEnvFloat64(key string, defaultValue float64) float64 {
+	if value := os.Getenv(key); value != "" {
+		if floatValue, err := strconv.ParseFloat(value, 64); err == nil {
+			return floatValue
+		}
+	}
+	return defaultValue
+}
+
+func getEnvDuration(key string, defaultValue time.Duration) time.Duration {
+	if value := os.Getenv(key); value != "" {
+		if duration, err := time.ParseDuration(value); err == nil {
+			return duration
+		}
+	}
+	return defaultValue
+}
+
+func getEnvSlice(key string, defaultValue []string) []string {
+	if value := os.Getenv(key); value != "" {
+		return []string{value}
+	}
+	return defaultValue
+}