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The FirstHopId type now records an enum that stores whether the hop
is a guard or a fallback. This change addresses concerns about
remembering to check the type or source of an Id before passing it
down to the FallbackState or GuardSet.
Making this change required an API change, so that dirmgr can
report success/failure status without actually knowing whether it's
using a fallback or a guard.
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This is preparation for having separate GuardId and FirstHopId types
that distinguish which back-end they index.
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We do this by creating a new FallbackSet type that includes status
information, and updating the GuardMgr APIs to record success and
failure about it when appropriate. We can use this to mark
FallbackDirs retriable (or not).
With this change, FallbackDir is now stored internally as a Guard in
the GuardMgr crate. That's fine: the FallbackDir type really only
matters for configuration.
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We need to extend our notion of "the origin of a guard" to include
"somewhere outside the guard list"; we need the ability to return a
FallbackDir as a Guard; and we need to remember a few more pieces of
information in each pending request.
As before, this commit may break compilation; it will be restored soon.
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The guard manager is responsible for handing out the first hops of
tor circuits, keeping track of their successes and failures, and
remembering their states. Given that, it makes sense to store this
information here. It is not yet used; I'll be fixing that in
upcoming commits.
Arguably, this information no longer belongs in the directory
manager: I've added a todo about moving it.
This commit will break compilation on its own in a couple of places;
subsequent commits will fix it up.
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This is the logical place for it, I think: the GuardMgr's job is to
pick the first hop for a circuit depending on remembered status for
possible first hops. Making this change will let us streamline the
code that interacts with these objects.
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