Only allow update if pid is on current node #184
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To the best of my knowledge,
Phoenix.Tracker.update/5should not be used to update presence metadata for processes that are on a separate node. If you do this, Bad Things will happen. Ask me how I know.So, this PR adds a safeguard against this.
Returning
{:error, :nopresence}might also be acceptable here for backwards-compatibility, at the cost of an error reason that isn't really accurate.I did my best to implement the test case, but I couldn't follow 100% what is going on, so there may be a better way to set it up.