Go Tidbit: How Much Was Read From io.Reader?
You have an
io.Reader, and you are about to pass it to some utility that will read from it. But the utility won’t tell you how much it has read from the
How do you figure out how many bytes of data were in the
Like this snippet of Go+AWS code:
You could implement a type that wraps the
io.Reader and proxies all calls to
Read while keeping track of the number of bytes read.
Or, you could use an
This method works while the number of bytes in the
io.Reader is not greater than the maximum possible value of a 64-bit integer. You probably aren’t hitting that limit. If you are, you have other challenges to deal with.
This post is 13th of my #100DaysToOffload challenge. Want to get involved? Find out more at 100daystooffload.com.
comments powered by Disqus