tree fd2e42a26bc71ae2cc8503d0d59349ca04377095
parent 0b025b1193b5cdf9b99a9c02783595df7edeba66
author Dmitri Shuralyov <dmitshur@golang.org> 1547063520 -0500
committer Dmitri Shuralyov <dmitshur@golang.org> 1547085564 +0000

[release-branch.go1.11] godoc/redirect: display Gerrit/Rietveld CL disambiguation page when needed

For CL numbers that are determined to be Rietveld CLs, instead of
immediately redirecting, check whether a Gerrit CL with the same
number also exists. Do so by querying the Gerrit API and caching
the existing CLs. If both exist, display a very simple disambiguation
HTML page.

Cache Gerrit CLs that exist, to avoid querying the remote API server
more than once per CL. We can't cache Gerrit CLs that don't exist,
since they might get created in the future.

Fixes golang/go#29645

Change-Id: I08c32dc82a0136788337c5c32028e87428e8d81e
Reviewed-on: https://go-review.googlesource.com/c/157237
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>