first commit

internal/config/config.go

@@ -0,0 +1,74 @@
+package config
+
+import (
+	"os"
+	"strconv"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	HTTP struct {
+		Addr string `yaml:"addr"`
+	} `yaml:"http"`
+	Database struct {
+		DSN          string `yaml:"dsn"`
+		MaxOpenConns int    `yaml:"max_open_conns"`
+		MaxIdleConns int    `yaml:"max_idle_conns"`
+	} `yaml:"database"`
+	Redis struct {
+		Addr       string `yaml:"addr"`
+		TTLSeconds int    `yaml:"ttl_seconds"`
+	} `yaml:"redis"`
+	JWT struct {
+		Secret     string `yaml:"secret"`
+		TTLMinutes int    `yaml:"ttl_minutes"`
+	} `yaml:"jwt"`
+	RateLimit struct {
+		RequestsPerMinute int `yaml:"requests_per_minute"`
+	} `yaml:"rate_limit"`
+	Email struct {
+		Endpoint string `yaml:"endpoint"`
+	} `yaml:"email"`
+}
+
+func Load() (Config, error) {
+	path := getenv("APP_CONFIG", "config.yaml")
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return Config{}, err
+	}
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return Config{}, err
+	}
+	override(&cfg)
+	return cfg, nil
+}
+
+func override(cfg *Config) {
+	if v := os.Getenv("HTTP_ADDR"); v != "" {
+		cfg.HTTP.Addr = v
+	}
+	if v := os.Getenv("DB_DSN"); v != "" {
+		cfg.Database.DSN = v
+	}
+	if v := os.Getenv("REDIS_ADDR"); v != "" {
+		cfg.Redis.Addr = v
+	}
+	if v := os.Getenv("JWT_SECRET"); v != "" {
+		cfg.JWT.Secret = v
+	}
+	if v := os.Getenv("RATE_LIMIT_RPM"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			cfg.RateLimit.RequestsPerMinute = n
+		}
+	}
+}
+
+func getenv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}