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update issue #32

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opened 2024-12-18 11:36:40 +00:00 by hannes · 0 comments
hannes commented 2024-12-18 11:36:40 +00:00
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So, an update consists of updating the git (git pull), dumping the git state, and then downloading tarballs that are not yet in the archive.

The trouble is that a download may stall since we don't timeout. And if such a download stalls, the entire "Lwt.async (sleep 1 hour >>= update)" stalls. And we'll never get to see updates again.

A good solution may be to add a timeout to the download process, as it is in normal TCP stacks with keep-alive... But a perfect timeout wouldn't be "this may only take 3 minutes", but instead "if there's no progress within Y minutes, consider this to be a failure".

So, an update consists of updating the git (git pull), dumping the git state, and then downloading tarballs that are not yet in the archive. The trouble is that a download may stall since we don't timeout. And if such a download stalls, the entire "Lwt.async (sleep 1 hour >>= update)" stalls. And we'll never get to see updates again. A good solution may be to add a timeout to the download process, as it is in normal TCP stacks with keep-alive... But a perfect timeout wouldn't be "this may only take 3 minutes", but instead "if there's no progress within Y minutes, consider this to be a failure".
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Reference: robur/opam-mirror#32
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