fix(storage): modify the callback of mrd to return length of data read instead of limit. #11687
+82
−26
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Currently MRD takes a callback in each Add call.
Current call back returns the offset, length and error on that add call making the callback function look like, func(int64,int64,error) .
In some scenario data read can be different from limit set.
For example: We just have 50 bytes to read and ask for 100 bytes(length/limit) in this scenario we will return just 50 bytes.
Hence changed the callback to return amount of data read instead of data limit set.
Added the go doc for callback.