alt Hacker NewsI wrote that library originally for dl.google.com: https://go.dev/talks/2013/oscon-dl.slide#1
I then open sourced it in Jan 2013 in what was then named Camlistore (now Perkeep) in https://github.com/perkeep/perkeep/commit/6f9f0bdda9c9c1f147... d
And later I put it in https://pkg.go.dev/github.com/golang/groupcache/singleflight (groupcache was written for dl.google.com)
And a private copy in Go's net package in Jun 2013: https://github.com/golang/go/commit/61d3b2db6292581fc07a3767...
It later moved to golang.org/x/net, and later to the Go standard library (well, internal: https://pkg.go.dev/internal/singleflight)
We now even have a copy with generics in Tailscale's tree at https://pkg.go.dev/tailscale.com/util/singleflight
So many variants of that code :)
> So many variants of that code
Indeed… That evolution makes perfect sense. A lot of Go developers independently arrived at similar request coalescing patterns around that time, especially in caching, RPC, and high concurrency systems. I have an older implementation from personal 2013-era Go projects that follows almost the same approach.
What is nice about open source is not necessarily the novelty of every individual idea, but having a well-tested, shared implementation the community can converge on. Your work on singleflight clearly became that reference point for the Go ecosystem, and it is cool to see the lineage from dl.google.com to groupcache, x/net, the standard library, and now all the downstream variants.