refactor(enginenetx): split generation and mixing #1591
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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.
It's time to run some tests.
bassosimone
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As mentioned in #1552 (comment), we want to split the generation of tactics and the mixing of tactics, such that it's easier to compose the desired overall policy.
Part of ooni/probe#2704.