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Evan Buss be78d83bd6 fix: single conversion at a time

See the notes for a full explanation, but basically
Kobo is making simultaneous requests and the
files were conflicting because there were 2 being
downloaded / converted at the same time which
resulted in unreliable behavior.

The solution is to protect the conversion
section to allow a single conversion to complete
before allowing the next one to start.

2024-07-14 19:56:00 +00:00

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Kobo Browser Quirks

Apparently the browser is using a very old version of WebKit.

Doesn't support fetch
- No HTMX
Doesn't support secure or httpOnly cookies
- They just silently fail to be set with these flags
Makes 2 parallel requests whenever an <a> link is clicked
- This doesn't seem to apply to URL bar navigation
- This poses issues when a request is not idempotent. Need to figure out a solution for these cases... For example when converting to Kepub, we encounter failures for the second requests due to file conflicts / deletions happening at the same time. I've fixed this by locking the conversion to a single request at a time with a mutex, but we still do the conversion twice, just one after the other. I was planning on creating an OPDS interface for OpenBooks but this will make all search / download requests send twice which is no good. The fix isn't as simple in that case.

967 B Raw Permalink Blame History

967 B

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