Ilia Denisov
85 lines
1.4 KiB
Go
85 lines
1.4 KiB
Go
package repo
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import (
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"encoding"
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"errors"
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e "github.com/iliadenisov/galaxy/internal/error"
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"github.com/iliadenisov/galaxy/internal/repo/fs"
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)
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func NewStorageError(err error) error {
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return e.NewRepoError(err)
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}
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func NewGameNotInitializedError() error {
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return e.NewGameNotInitializedError()
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}
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func NewStateError(msg string) error {
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return e.NewGameStateError(msg)
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}
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type Storage interface {
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Lock() (func() error, error)
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Exists(string) (bool, error)
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Write(string, encoding.BinaryMarshaler) error
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Read(string, encoding.BinaryUnmarshaler) error
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ReadSafe(string, encoding.BinaryUnmarshaler) error
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}
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type repo struct {
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s Storage
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release func() error
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}
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func NewRepo(s Storage) (*repo, error) {
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r := &repo{
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s: s,
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}
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return r, nil
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}
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func NewFileRepo(path string) (*repo, error) {
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s, err := fs.NewFileStorage(path)
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if err != nil {
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return nil, err
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}
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return NewRepo(s)
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}
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func (r *repo) Lock() (err error) {
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if r.s == nil {
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return errors.New("storage is closed")
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}
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if r.release != nil {
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return errors.New("storage already locked")
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}
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r.release, err = r.s.Lock()
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if err != nil {
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r.close()
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return
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}
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return nil
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}
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func (r *repo) Release() (err error) {
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if r.s == nil {
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return errors.New("storage is closed")
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}
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if r.release == nil {
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return errors.New("storage was never locked")
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}
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err = r.release()
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if err != nil {
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return
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}
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r.close()
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return nil
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}
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func (r *repo) close() {
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r.release = nil
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r.s = nil
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}
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