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Better explanation of NewSpreadFS

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This commit is contained in:
Deluan 2021-02-09 13:15:43 -05:00
parent 157faad028
commit 1d681d92d3
1 changed files with 11 additions and 3 deletions

14
utils/cache/spread_fs.go vendored

@ -19,9 +19,17 @@ type spreadFS struct {
init func() error
}
// NewSpreadFS returns a FileSystem rooted at directory dir. It
// Dir is created with perms if it doesn't exist.
func NewSpreadFS(dir string, mode os.FileMode) (fscache.FileSystem, error) {
// NewSpreadFS returns a FileSystem rooted at directory dir. This FS hashes the key and
// distributes all files in a layout like XX/XX/XXXXXXXXXX. Ex:
// Key is abc123.300x300.jpg
// Hash would be: c574aeb3caafcf93ee337f0cf34e31a428ba3f13
// File in cache would be: c5 / 74 / c574aeb3caafcf93ee337f0cf34e31a428ba3f13
// The idea is to avoid having too many files in one dir, which could potentially cause performance issues
// and may hit limitations depending on the OS.
// See discussion here: https://github.com/djherbis/fscache/issues/8#issuecomment-614319323
//
// dir is created with specified mode if it doesn't exist.
func NewSpreadFS(dir string, mode os.FileMode) (*spreadFS, error) {
fs := &spreadFS{root: dir, mode: mode, init: func() error {
return os.MkdirAll(dir, mode)
}}