add service

internal/config/config.go

@@ -0,0 +1,111 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Database DatabaseConfig `yaml:"database"`
+	AI       AIConfig       `yaml:"ai"`
+	Security SecurityConfig `yaml:"security"`
+	GRPC     GRPCConfig     `yaml:"grpc"`
+	Logging  LoggingConfig  `yaml:"logging"`
+}
+
+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:"ssl_mode"`
+	MaxConns int    `yaml:"max_conns"`
+	MinConns int    `yaml:"min_conns"`
+}
+
+type AIConfig struct {
+	OpenAIKey     string `yaml:"openai_key"`
+	PerplexityKey string `yaml:"perplexity_key"`
+}
+
+type SecurityConfig struct {
+	JWTSecret    string `yaml:"jwt_secret"`
+	CryptoSecret string `yaml:"crypto_secret"`
+}
+
+type GRPCConfig struct {
+	Port           int `yaml:"port"`
+	MaxConnections int `yaml:"max_connections"`
+}
+
+type LoggingConfig struct {
+	Level string `yaml:"level"`
+}
+
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read config file: %w", err)
+	}
+
+	data = []byte(expandEnvWithDefaults(string(data)))
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal config: %w", err)
+	}
+
+	if err := cfg.validate(); err != nil {
+		return nil, fmt.Errorf("invalid config: %w", err)
+	}
+
+	return &cfg, nil
+}
+
+func expandEnvWithDefaults(s string) string {
+	re := regexp.MustCompile(`\$\{([^:}]+):([^}]*)\}`)
+	result := re.ReplaceAllStringFunc(s, func(match string) string {
+		parts := re.FindStringSubmatch(match)
+		if len(parts) != 3 {
+			return match
+		}
+		envVar := parts[1]
+		defaultVal := parts[2]
+		if val := os.Getenv(envVar); val != "" {
+			return val
+		}
+		return defaultVal
+	})
+	return os.ExpandEnv(result)
+}
+
+func (c *Config) validate() error {
+	if c.Database.Host == "" {
+		return fmt.Errorf("database host is required")
+	}
+	if c.Database.Name == "" {
+		return fmt.Errorf("database name is required")
+	}
+	if c.Database.User == "" {
+		return fmt.Errorf("database user is required")
+	}
+	if c.Database.Password == "" {
+		return fmt.Errorf("database password is required")
+	}
+	if c.Security.JWTSecret == "" {
+		return fmt.Errorf("JWT secret is required")
+	}
+	if c.Security.CryptoSecret == "" {
+		return fmt.Errorf("crypto secret is required")
+	}
+	return nil
+}
+
+func (c *Config) DatabaseURL() string {
+	return fmt.Sprintf("postgres://%s:%s@%s:%d/%s?sslmode=%s",
+		c.Database.User, c.Database.Password, c.Database.Host, c.Database.Port, c.Database.Name, c.Database.SSLMode)
+}