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* Builders additionally derive: Debug, Serialize, Deserialize.
* Validated structs no longer derive: Serialize, Deserialize
and all related attributes deleted.
* As a consequence, all the `#[serde(deny_unknown_fields)]`
are gone. That means that right now unknown fields are totally
ignored. This is good for compatibility but poor for useability.
Doing something better here is arti#417, in progress.
* As a consequence, delete tor_dirmgr::retry::default_parallelism.
(The default value was already duplicated into a builder attr.)
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And drop the ad-hoc orport() method. This brings FallbackDir's
orports field in line with our list builder API.
The general semver note in "configuation" seems to cover most of this.
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This avoids it having to recapitulate defaulting logic.
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Now the network fallbacks configuration wants to Deserialize
a Vec<FallbackDirBuilder>, rather than validated Vec<FallbackDir>.
Methods on FallbackListBuilder are as per
https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/462#note_2797697
mutatis mutandi for the fact that this struct has only fallbacks in it.
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This is where the FallbackList type is. We are going to want to
provide a builder too, which ought to impl Default.
This means that the default value for the type must be next to the
type. In any case, it was anomalous that it wasn't.
This commit is pure code motion.
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It's about to be shared between fallbacks and guards.
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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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