metrics

var Directive = service.Directive{
	Name: "metrics",
	Init: func(s *service.Instance, c config.Dispenser) error {
		cfg := Config{}

		c.Next()

		for c.NextBlock() {
			switch c.Val() {
			case "namespace", "ns":
				if !c.NextArg() {
					return c.ArgErr()
				}
				cfg.Namespace = c.Val()

			case "subsystem", "sub":
				if !c.NextArg() {
					return c.ArgErr()
				}
				cfg.Subsystem = c.Val()

			case "token":
				if !c.NextArg() {
					return c.ArgErr()
				}
				cfg.Token = c.Val()

			case "path":
				if !c.NextArg() {
					return c.ArgErr()
				}
				cfg.Path = c.Val()

			case "ignore":
				if !c.NextArg() {
					return c.ArgErr()
				}
				cfg.Ingore = c.RemainingArgs()

			default:
				return c.SyntaxErr("unexpected keyword")

			}
		}

		if cfg.Namespace == "" && s.Name() != "" {
			cfg.Namespace = s.Name()
		}

		if c.Next() {
			return c.SyntaxErr("unexpected keyword %q, metrics can only be used once", c.Val())
		}

		s.AddRouterOption(WithMetrics(cfg))

		return nil
	},
}