doc(enginenetx): add design document #1595
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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.
Co-authored-by: Arturo Filastò <[email protected]>
Co-authored-by: Arturo Filastò <[email protected]>
Co-authored-by: Arturo Filastò <[email protected]>
It's time to run some tests.
Conflicts: internal/enginenetx/network.go
Conflicts: internal/enginenetx/bridgespolicy.go internal/enginenetx/bridgespolicy_test.go internal/enginenetx/statspolicy.go internal/enginenetx/userpolicy_test.go
This diff addresses a bug observed on the wild where a slow DNS causes several tactics to be ready concurrently. If we want several tactics to be ready concurrently, we should arrange for that, and for now BTW that's not the case. Part of ooni/probe#2704.
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This design document documents the current implementation in light of the changes requested in the #1552 pull request review. The actual changes have been implemented by previous pull requests and basically boil down to ensure we give the DNS the priority when dialing.
See #1552 for the original design review as well as for a list of all the subsequent pull requests that were merged to address the review comments.
Additionally, this PR explains in the design document what are the current limitations and what we could do next.
With the merging of this PR, we can close ooni/probe#2704.
Closes #1552.