26 lines
1.3 KiB
Text
26 lines
1.3 KiB
Text
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After a release on Monday, I've spent the week working on
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[[async extension to external special remote protocol|design/external_special_remote_protocol/async_appendix]].
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This is lets a single external special remote process handle multiple
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requests at the same time, when it's more efficient to use one process
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than for git-annex to run several processes.
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It's a good thing I added support for extensions a couple of years back.
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I never imagined at the time using it for something like this, that
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radically changes the whole protocol! It could have just been protocol
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version 2, but then special remotes would be pushed towards using this by
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default, which I don't want. It's probably overkill for most of them.
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J 4 CHECKPRESENT Key3
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J 5 CHECKPRESENT Key4
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J 6 REMOVE Key5
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J 4 CHECKPRESENT-SUCCESS Key3
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J 6 REMOVE-SUCCESS Key5
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J 5 CHECKPRESENT-FAILURE Key4
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The protocol extension went through a bunch of iterations, ending up with
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probably the simplest possible way to do it, a simple framing layer around
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the main protocol. I started with rather a lot of rather hairy code and it
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kind of all melted away as I refined the protocol down to that, which was
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nice, although I also kind of wish I had been able to jump right to
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the clean and simple end result.
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