feat: add mongo driver options constructor (#5)

* feat: add mongo driver options constructor

* fix: error on empty client

driver/driver.go

@@ -11,6 +11,34 @@ type Driver struct {
 	dbName string
 }
 
+type Option func(d *Driver)
+
+func WithClient(client *mongo.Client) Option {
+	return func(d *Driver) {
+		d.client = client
+	}
+}
+
+func WithDbName(dbName string) Option {
+	return func(d *Driver) {
+		d.dbName = dbName
+	}
+}
+
+func NewWithOptions(options ...Option) (*Driver, error) {
+	d := &Driver{}
+
+	for _, opt := range options {
+		opt(d)
+	}
+
+	if d.client == nil {
+		return nil, ErrEmptyClient
+	}
+
+	return d, nil
+}
+
 func New(ctx context.Context) (*Driver, error) {
 	return NewWithConfig(ctx, DefaultConfig())
 }

driver/errors.go

@@ -0,0 +1,7 @@
+package driver
+
+import "errors"
+
+var (
+	ErrEmptyClient = errors.New("mgorepo-driver: client is nil")
+)