feat: load backend config from yaml

backend/internal/config/config.go

@@ -1,32 +1,44 @@
 package config
 
-import "os"
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
 
 type Config struct {
-	Env                   string
-	Port                  string
-	DatabaseURL           string
-	StorageDir            string
-	AuthSecret            string
-	SystemAIKey           string
-	AIKeyEncryptionSecret string
+	Env                   string `yaml:"env"`
+	Port                  string `yaml:"port"`
+	DatabaseURL           string `yaml:"database_url"`
+	StorageDir            string `yaml:"storage_dir"`
+	AuthSecret            string `yaml:"auth_secret"`
+	SystemAIKey           string `yaml:"system_ai_key"`
+	AIKeyEncryptionSecret string `yaml:"ai_key_encryption_secret"`
 }
 
 func Load() Config {
-	return Config{
-		Env:                   getenv("APP_ENV", "development"),
-		Port:                  getenv("PORT", "8080"),
-		DatabaseURL:           getenv("DATABASE_URL", "postgres://agent:agent@localhost:5432/agent?sslmode=disable"),
-		StorageDir:            getenv("STORAGE_DIR", "./data/files"),
-		AuthSecret:            getenv("AUTH_SECRET", "development-auth-secret-change-me"),
-		SystemAIKey:           os.Getenv("SYSTEM_AI_KEY"),
-		AIKeyEncryptionSecret: getenv("AI_KEY_ENCRYPTION_SECRET", "development-ai-key-secret-change-me"),
+	cfg, err := LoadFromDir("etc")
+	if err != nil {
+		panic(err)
 	}
+	return cfg
 }
 
-func getenv(key string, fallback string) string {
-	if value := os.Getenv(key); value != "" {
-		return value
+func LoadFromDir(configDir string) (Config, error) {
+	mode := strings.TrimSpace(os.Getenv("SENLIN_APP_MODE"))
+	if mode == "" {
+		mode = "dev"
 	}
-	return fallback
+	path := filepath.Join(configDir, "agent."+strings.ToLower(mode)+".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
+	}
+	return cfg, nil
 }