feat(session): implement CallWebConnectivityTestHelper #1581
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This diff includes a first attempt at consolidating the patterns with which we invoke OONI and third-party API calls. I have refactored the code of httpx and httpapi into a new package called httpclientx, added some tests, started converting some parts of the tree, and explained myself in a design document. Part of ooni/probe#2700
Spotted thanks to a very paranoid check inside ./internal/oonirun. Was not a problem before for `httpx` because of its usage pattern and may or may not be a problem for the `httpapi` package (did not check since this work is focused on replacing both `httpx` and `httpapi`).
Previously, we were gracefully handling this case, but honestly it is not the best approach to pretend there's an empty structure if the server breaks the API and returns `"null"` rather than an object. That said, it was still awesome to have this test in place because it helped us to figure out this extra condition of which httpclientx should be aware and that this problem needs to be dealt with systematically inside the httpclientx package.
Conflicts: internal/enginelocate/cloudflare.go internal/enginelocate/ubuntu.go
Conflicts: internal/oonirun/v2_test.go
As before, here I am going to ensure there's redundancy.
Conflicts: internal/httpclientx/DESIGN.md internal/httpclientx/getraw.go internal/httpclientx/overlapped.go
Conflicts: internal/probeservices/login_test.go
Conflicts: internal/testingx/oonicollector.go
Conflicts: internal/probeservices/collector_test.go
Conflicts: internal/probeservices/bouncer.go internal/probeservices/collector.go internal/probeservices/login.go internal/probeservices/measurementmeta.go internal/probeservices/psiphon.go internal/probeservices/register.go internal/probeservices/tor.go
While there, add additional tests ensuring that we're actually writing into the key-value store after check-in. Also, ensure that failure to write into the key-value store does not break check-in for good.
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The #1581 pull request missed that adding a `CallWebConnectivityTestHelper` method to `*engine.Session` means we need to mock such a method in `webconnectivityqa`. I could have mocked the method, but I was not super happy about doing this, because I would rather have wanted to add more QA tests inside of `webconnectivityqa` making sure we're indeed falling back when using test helpers. (We have unit tests testing that, but it would be nice to have integration tests, so we could observe the overall code behavior.) My initial approach for allowing this was to create a `CallWebConnectivityTestHelper` function inside the engine, taking a `model.ExperimentSession` as its fourth argument and then modifying the `CallWebConnectivityTestHelper` method to just invoke the function passing to it the session. However, this approach created import cycles in tests. To avoid import cycles, I moved the `CallWebConnectivityTestHelper` function to `webconnectivityalgo` and modified the mocks inside `webconnectivityqa` to call such a function. This is where I paused and realized that the cleanest solution is actually to just always call the `CallWebConnectivityTestHelper` function in `webconnectivityalgo` and undo part of the changes in #1581 to avoid having a `CallWebConnectivityTestHelper` method inside of `model.ExperimentSession`. And so I also implemented this change. All of this leads us to the current diff, which is part of ooni/probe#2725.
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Part of ooni/probe#2725