Singleflight read/write ops

[eligao]

Describe the feature

It is easy to bloat the cache by firing up multiple identical requests when the resource refreshes.
How about implementing a singleflight policy in read/write ops of the Storage?
reference:

• https://medium.com/@mhrlife/avoid-duplicate-requests-while-filling-cache-98c687879f59
• https://github.com/zcong1993/singleflight

Additional information

• Would you be willing to help implement this feature?