Add logs to warn when not all 3 files (mod, info and zip) are present
#1.171 aberto em 30 de mar. de 2019
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Description
Is your feature request related to a problem? Please describe.
The file system storage currently checks for all three files (.mod, .zip, .info) exist and fails any one endpoint if they don't all exist. This can be problematic if, for some reason, 1/3 or 2/3 of the files exist. In this case, Athens will "fall back" to downloading the module from the VCS and overwriting it in its storage.
That's not an optimal solution, but without a larger refactoring, it's the best we can do
Describe the solution you'd like
We should clearly log when we run into a situation when a module doesn't have all 3 files present. The log should be a "warning" with detailed information on why this happens and what Athens is doing to fix it (i.e. falling back to the VCS), and what that means (the module might get overwritten)
Describe alternatives you've considered
A larger refactor of how files are stored on disk
Additional context
This is a follow-up from https://github.com/gomods/athens/pull/1143#issuecomment-474602212.