func (s Storage) Get(key string) ([]data.Post, error) {
k := makeKey(s.context, key)
value, err := get(s.context, k)
if err != nil {
return nil, err
}
return data.ReadPosts(bytes.NewBuffer(value.Bytes))
}
func (ds DataStore) Get(key string) ([]data.Post, error) {
file, err := os.Open(filepath.Join(string(ds), key))
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
defer file.Close()
return data.ReadPosts(file)
}
func (ds DataStore) Post(key string, post data.Post) error {
file, err := os.OpenFile(filepath.Join(string(ds), key), os.O_RDWR|os.O_CREATE, os.ModePerm)
if err != nil {
return err
}
defer file.Close()
posts, err := data.ReadPosts(file)
if err != nil && err != io.EOF {
return err
}
if _, err = file.Seek(0, os.SEEK_SET); err != nil {
return err
}
if err = file.Truncate(0); err != nil {
return err
}
return data.AddPost(post, posts, file, MAX_POSTS_PER_KEY)
}
func (s Storage) Post(key string, post data.Post) error {
var status error
if err := datastore.RunInTransaction(s.context, func(context appengine.Context) error {
k := makeKey(context, key)
value, err := get(context, k)
if err != nil {
return err
}
posts, status := data.ReadPosts(bytes.NewBuffer(value.Bytes))
if status != nil && status != io.EOF {
return nil
}
buffer := bytes.NewBuffer(nil)
status = data.AddPost(post, posts, buffer, MAX_POSTS_PER_KEY)
if status != nil {
return nil
}
_, err = datastore.Put(context, k, &record{Bytes: buffer.Bytes()})
return err
}, nil); err != nil {
return err
}
return status
}