Add FS store

[Kuixz]

Refer issue #22

Two questions

1. Where should i put the file fs_test.go?
2. Path to value should be fsPath/namespace/key or ./fsPath/namepsace/key? -L 34;51

[cychiuae]

Where should i put the file fs_test.go?

In golang, we put the test file in the same directory

Path to value should be fsPath/namespace/key or ./fsPath/namepsace/key? -L 34;51

Your implementation doesn't need to care whether it is an absolute path or a relative path but fyi I expect the fsPath will be an absolute path in the config file

[cychiuae]

According to https://pkg.go.dev/os#WriteFile, it will automatically create if necessary. You don't need to touch it.

[Kuixz]

In my testing it will consistently throw no such file or directory error if not Touch the path beforehand.
I think it might be related to this SO question about os.Create, excerpt:

... you need to ensure that the base directory exists, because os.Create does not handle it.

[cychiuae]

1. If all branches of the if-elseif-else are returning something, usually we don't write the else case because it will create too much indentation and make worse readability.

[cychiuae]

2. Golang people like multiple ifs and check err one by one

file, err := os.OpenFile(...)
if err != nil {
  return err
}

err = file.Close()
if err != nil {
  return err
}

return nil

[Kuixz]

So strange, why not just return file.Close() 🤔 I will apply this change to os.WriteFile call in Set also

[cychiuae]

readme.md has conflicts 🤔

[Kuixz]

Will there be squash when merging (turn 6 commits into 1)?