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feat: Pubsub.SeenMessagesTTL #9372
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186a314
feat: make pubsub seen messages cache ttl configurable
smrz2001 7a22190
docs(config): Pubsub.SeenMessagesTTL
lidel 77eead2
chore(docs): add more details for `Pubsub.SeenMessagesTTL`
smrz2001 4b8eafa
fix(test): add tests for `Pubsub.SeenMessagesTTL`
smrz2001 a62272f
go mod tidy
smrz2001 c97c89b
chore: clarify pubsub tests
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This PR needs a basic regression test that ensures
Pubsub.SeenMessagesTTLset by the user is respected.Unsure what is the best way to test this, you'd need to set it too low and then observe duplicates?
@smrz2001 we have some prior art in
test/sharness/t0320-pubsub.shif that helps.There was a problem hiding this comment.
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Hey @lidel, it took me a bit to get everything figured out and setup with
sharness. After playing around with it a bit, I'm realizing that there isn't really a good way to induce duplicate pubsub messages. The API (rightly) doesn't allow setting a message ID explicitly.The only option I can currently come up with is to use
tc netemvia command line or code to simulate network traffic duplication.Does this seems like a viable approach? Not sure what the restrictions are around what tests are/aren't allowed to do. I've used
tc netembefore so I can figure this out, if acceptable.There was a problem hiding this comment.
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Thank you for looking into this. I hoped there is an easier way, but I guess we've hit an edge case on this one.
We already have some helpers for sharness in
./test/dependencies, such aspollEndpoint, so that is a potential path forward (golang helper is a bit more future-proof, could be reused when we move away from the sharness). Usingtc netemis also an option, if we can get it to work on CI.@marten-seemann @vyzo is there a better / less painful way to test
WithSeenMessagesTTL/ simulate duplicated messages?There was a problem hiding this comment.
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I'm thinking aloud here but I could also make a
libp2p-simtool undertest/dependenciesthat connects to libp2p like a normal node but is capable of sending spurious messages. Might be useful in other contexts too perhaps.There was a problem hiding this comment.
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probably not, we do go out of our way to supress them.
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This and libp2p/go-libp2p-pubsub#502 both sound sensible 👍
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@lidel, would it be possible to do a regular Golang unit test here instead of adding to
sharness?There was a problem hiding this comment.
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@lidel, after a lot of hair pulling, I was unable to set up a libp2p simulator but I was able to figure out how to write a Go test under
test/integrationthat does the job, IMO. Would it work to keep the test there? Let me know what you think.FYI, this test uncovered another pubsub/cache bug, which I will fix under this issue.
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Thank you for doing due diligence on this, yes, your approach is acceptable: this is the best we can do given tools at hand, and it still acts as an early warning if go-libp2p APIs change, or a regression is introduced.
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Excellent, thanks so much, @lidel!! 🙏🏼🙏🏼
I'll try to get the other bugs fixed soon as well, and will update the dependencies and tests accordingly.