// Retrieve returns a cached Resource for the given key
func (c *cache) Retrieve(key string) (*Resource, error) {
f, err := c.fs.Open(bodyPrefix + formatPrefix + hashKey(key))
if err != nil {
if vfs.IsNotExist(err) {
return nil, ErrNotFoundInCache
}
return nil, err
}
h, err := c.Header(key)
if err != nil {
if vfs.IsNotExist(err) {
return nil, ErrNotFoundInCache
}
return nil, err
}
contentLength, err := f.Seek(0, 2)
if err != nil {
if vfs.IsNotExist(err) {
return nil, ErrNotFoundInCache
}
return nil, err
}
f.Seek(0, 0)
res := NewResource(h.StatusCode, contentLength, f, h.Header)
if staleTime, exists := c.stale[key]; exists {
if !res.DateAfter(staleTime) {
log.Printf("stale marker of %s found", staleTime)
res.MarkStale()
}
}
return res, nil
}
// Retrieve the Status and Headers for a given key path
func (c *cache) Header(key string) (Header, error) {
path := headerPrefix + formatPrefix + hashKey(key)
f, err := c.fs.Open(path)
if err != nil {
if vfs.IsNotExist(err) {
return Header{}, ErrNotFoundInCache
}
return Header{}, err
}
return readHeaders(bufio.NewReader(f))
}
func (m *Manager) Create(name string, overwrite bool) (io.WriteCloser, error) {
flags := os.O_WRONLY | os.O_CREATE
if !overwrite {
flags |= os.O_EXCL
}
f, err := m.fs.OpenFile(name, flags, 0644)
if err != nil && vfs.IsNotExist(err) {
// Try to create the directory
if err2 := vfs.MkdirAll(m.fs, path.Dir(name), 0755); err2 == nil {
f, err = m.fs.OpenFile(name, flags, 0644)
}
}
return f, err
}