swarm: make smart-dialing opt in #2340
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I changed my mind on this being a bool. We can just allow people to inject their own dial ranker. In this release, by default a nil dial ranker will be used, disabling smart dialing. In the next release, by default the DefaultDialRanker will be used, and to disable smart dialing, you'd pass in a nil dial ranker.
defaults.go
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| @@ -135,6 +135,11 @@ var DefaultPrometheusRegisterer = func(cfg *Config) error { | |||
| return cfg.Apply(PrometheusRegisterer(prometheus.DefaultRegisterer)) | |||
| } | |||
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| // DefaultSmartDialing configures libp2p to disable smart dialing by default | |||
| var DefaultSmartDialing = func(cfg *Config) error { | |||
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Why do we need an option for that?
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I don't get this. This helps us flip the default option in a later release. Is there a way to do this without this?
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Do we need to explicitly define a type? Can’t we just apply the default if no dial ranker is set?
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To be clear we are now discussion the config fields: DialRanker and DialRankerCustom.
If we don't have DialRankerCustom we cannot distinguish between cases where the user has not provided a value and where the user has explicitly provided nil to disable smart dialing. This is not an issue now but for the future release where we want to turn smart dialing on by default we will need to use swarm.DefaultDialRanker in such cases. I want to keep the behaviour that option DialRanker(nil) disables smart dialing in future releases.
Using a Default Option just felt cleaner. see DefaultEnableRelay
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What about doing the thing we did for the rcmgr? Provide a NullDialRanker implementation. iiuc we already have that, the NoDelayDialRanker.
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I don't have strong opinions on this. Removed the field DialRankerCustom and the explicit default option. Now default is set here https://github.com/sukunrt/go-libp2p/blob/smart-dialing-optin/config/config.go#L180
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@marten-seemann ignoring the changelog, is this what you had in mind? Update: removed changes to changelog in favour of #2342 |
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No strong opinion, but I think it's a nicer api for the user to be able to enable/disable smart dialing with a boolean rather than having users know about dial rankers. |
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