multierror: implement BuildErrorString and mark as legacy #1587
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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/overlapped.go
bassosimone
changed the title
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This diff implements BuildErrorString, which we need in #1560 to construct
multierrorcompatible error strings inside thehttpclientxpackage.While there, recognize that
multierrorshould now be considered legacy (i.e., minor changes and only bugfixes) because its implementation hasUnwrap() errorwhile not it would be better to useUnwrap() []errorsbut, if we were switching to the new callback, error wrapping would find syscall errors and use them as the result.Therefore, an error like:
would be reduced to:
Because this behavior is subtle, I think it's best to move multierror inside
./internal/legacyand document this.Part of ooni/probe#2729.