update databasing system with minimum API, schema parsing and FreeCAD

integration

internal/config/config.go

@@ -0,0 +1,122 @@
+// Package config handles configuration loading.
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Config holds all application configuration.
+type Config struct {
+	Server   ServerConfig   `yaml:"server"`
+	Database DatabaseConfig `yaml:"database"`
+	Storage  StorageConfig  `yaml:"storage"`
+	Schemas  SchemasConfig  `yaml:"schemas"`
+	FreeCAD  FreeCADConfig  `yaml:"freecad"`
+}
+
+// ServerConfig holds HTTP server settings.
+type ServerConfig struct {
+	Host    string `yaml:"host"`
+	Port    int    `yaml:"port"`
+	BaseURL string `yaml:"base_url"`
+}
+
+// DatabaseConfig holds PostgreSQL connection settings.
+type DatabaseConfig struct {
+	Host           string `yaml:"host"`
+	Port           int    `yaml:"port"`
+	Name           string `yaml:"name"`
+	User           string `yaml:"user"`
+	Password       string `yaml:"password"`
+	SSLMode        string `yaml:"sslmode"`
+	MaxConnections int    `yaml:"max_connections"`
+}
+
+// StorageConfig holds MinIO connection settings.
+type StorageConfig struct {
+	Endpoint  string `yaml:"endpoint"`
+	AccessKey string `yaml:"access_key"`
+	SecretKey string `yaml:"secret_key"`
+	Bucket    string `yaml:"bucket"`
+	UseSSL    bool   `yaml:"use_ssl"`
+	Region    string `yaml:"region"`
+}
+
+// SchemasConfig holds schema loading settings.
+type SchemasConfig struct {
+	Directory string `yaml:"directory"`
+	Default   string `yaml:"default"`
+}
+
+// FreeCADConfig holds FreeCAD integration settings.
+type FreeCADConfig struct {
+	URIScheme  string `yaml:"uri_scheme"`
+	Executable string `yaml:"executable"`
+}
+
+// Load reads configuration from a YAML file.
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config file: %w", err)
+	}
+
+	// Expand environment variables
+	data = []byte(os.ExpandEnv(string(data)))
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config YAML: %w", err)
+	}
+
+	// Apply defaults
+	if cfg.Server.Port == 0 {
+		cfg.Server.Port = 8080
+	}
+	if cfg.Database.Port == 0 {
+		cfg.Database.Port = 5432
+	}
+	if cfg.Database.SSLMode == "" {
+		cfg.Database.SSLMode = "require"
+	}
+	if cfg.Database.MaxConnections == 0 {
+		cfg.Database.MaxConnections = 10
+	}
+	if cfg.Storage.Region == "" {
+		cfg.Storage.Region = "us-east-1"
+	}
+	if cfg.Schemas.Directory == "" {
+		cfg.Schemas.Directory = "/etc/silo/schemas"
+	}
+	if cfg.FreeCAD.URIScheme == "" {
+		cfg.FreeCAD.URIScheme = "silo"
+	}
+
+	// Override with environment variables
+	if v := os.Getenv("SILO_DB_HOST"); v != "" {
+		cfg.Database.Host = v
+	}
+	if v := os.Getenv("SILO_DB_NAME"); v != "" {
+		cfg.Database.Name = v
+	}
+	if v := os.Getenv("SILO_DB_USER"); v != "" {
+		cfg.Database.User = v
+	}
+	if v := os.Getenv("SILO_DB_PASSWORD"); v != "" {
+		cfg.Database.Password = v
+	}
+	if v := os.Getenv("SILO_MINIO_ENDPOINT"); v != "" {
+		cfg.Storage.Endpoint = v
+	}
+	if v := os.Getenv("SILO_MINIO_ACCESS_KEY"); v != "" {
+		cfg.Storage.AccessKey = v
+	}
+	if v := os.Getenv("SILO_MINIO_SECRET_KEY"); v != "" {
+		cfg.Storage.SecretKey = v
+	}
+
+	return &cfg, nil
+}