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The new CircMgr::build_circuits_preemptively function actually causes
preemptive circuits to be built; it gets called from arti-client, like
the other daemon tasks the CircMgr has.
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In preparation for making Arti build circuits preemptively, this commit
introduces `TargetCircUsage::Preemptive`, a circuit usage that works
somewhat differently from other ones: it requires at least 2 circuits to
exist that can exit the port it contains in order for an existing
circuit to match against it (path-spec.txt § 2.1.1); if that's not the
case, that usage will require building new circuits (in order that we
build enough to have 2 available).
This required refactoring how circuit reuse worked; now,
`CircList::find_open` uses the new `AbstractSpec::find_supported` trait
method, which we customize to implement the above check in the case of
`Preemptive` circuit usages. To make that work, `OpenEntry` now takes
two type parameters (the spec and circuit types), instead of taking a
builder type parameter and using its associated types. (We also got rid
of type constraints on that struct, yay!)
A WIP implementation of a preemptive circuit predictor that implements
path-spec.txt § 2.1.1 is also included, but this will require additional
effort to wire it up with the `CircMgr` properly.
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This doesn't add much to coverage, but it's important.
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Most of the structs in `arti-client` have example code now, to give a
clearer idea of how they're used.
Annoyingly, a lot of the types exposed in `arti-client` are actually
re-exports, which makes documentation a bit harder: example code that
references other parts of `arti-client` can't actually be run as a
doctest, since the crate it's in is a dependency of `arti-client`.
We might be able to fix this in future by doing the documentation in
`arti-client` itself, but rustdoc seems to have some weird behaviours
there that need to be investigated first (for example, it seems to merge
the re-export and original documentation, and also put the re-export
documentation on the `impl` block for some reason).
For now, though, this commit just writes the docs from the point of view
of an `arti-client` consumer, removing notes specific to the crate in
which they're defined. It's not ideal, but at least the end user
experience is decent.
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Now that we have two kinds of isolation tokens (those set on a
stream, and those set by the stream's associated TorClient), we
need a more sophisticated kind of isolation.
This fixes the bug introduced with the previous commit, where
per-stream tokens would override per-TorClient tokens.
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There are some limitations here, as noted in the comments.
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(When we're building a path with a guard, we need to tell the guard
manager whether the path succeeded, and we need to wait to hear
whether the guard is usable.)
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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