internal/postgres: support for getting path info

Add GetPathInfo, a function that gets information about a path. The
main handler would call either GetPathInfo(path, "unknown", "latest")
if the incoming URL path had no "@", or GetPathInfo(path, "unknown",
version) if the incoming path looked like "foo@v".

Based on the returned path (or absence of one), it would decide whether
to call GetDirectory, GetPackage or GetModule.

Change-Id: Ifc09202d8ec110960e2c3bbaf04b79fc7a7c72df
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/728098
Reviewed-by: Julie Qiu <julieqiu@google.com>

0 files changed, 0 insertions, 0 deletions