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Two concurrent fetches can occur from the same peer, while also being for a different set of references. This was seen in the `test_outdated_sigrefs` test. Alice would have an ongoing fetch from Eve, and concurrently, Eve will create a new issue -- thus creating a new `RefsAt` message -- and Alice would attempt to fetch this. The previous logic would only check that Alice is fetching from Eve and ignore the new updates -- meaning the test could fail. However, if the `RefsAt` are checked then the other fetch can be recognised as new, and queue it. Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett |
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