feat(enginenetx): add algorithms to filter, mix, and stream tactics #1556
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This diff refactors the code generating tactics to mix bridge and DNS tactics, such that we avoid trying all bridge tactics before falling back to DNS tactics. In the event in which the bridge is IP or endpoint blocked, this change makes sure we try using DNS tactics earlier, and, if the DNS is working, this means a faster bootstrap. Based on testing, where I replaced the bridge address with 10.0.0.1, we try DNS tactics after 8 seconds. After the first run, if the DNS tactics are working, we would immediately use them before bridge tactics, since we store information about tactics inside the $OONI_HOME/engine dir. Part of ooni/probe#2704.
Previously, we were only testing with DNS returning error, while now we should also have a test case for when it's working given that we're mixing tactics together now.
Conflicts: internal/enginenetx/bridgespolicy_test.go internal/enginenetx/statspolicy.go
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This diff refactors enginenetx to assign InitialDelay only when dialing. It is pointless to do that before. Also, take advantage of algorithms introduced by #1556 to make the code more compact. Part of ooni/probe#2704.
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This diff extends the enginenetx package to add algorithms to filter, mix, and stream tactics.
We will use this algorithms to simplify the implementation and make it more composable.
This work is part of ooni/probe#2704.