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See the new commentary text on `ClientCirc` for the rationale.
Signed-off-by: Ian Jackson <[email protected]>
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We are going to get rid of the Arc. Happily there is an id which is
always constructed uniquely and preserved by clone.
(auto-deref lets us make the function take &Self instead of &Arc)
Signed-off-by: Ian Jackson <[email protected]>
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This removes a lot of open-coded Arc::ptr_eq() calls
Signed-off-by: Ian Jackson <[email protected]>
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This will make the code work when it's not an Arc any more.
Signed-off-by: Ian Jackson <[email protected]>
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We are going to get rid of a lot of Arc, so we need the underlying
thing to be Clone.
Signed-off-by: Ian Jackson <[email protected]>
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IIUC, these anticipatd a need to store min_exit_circs_per_port in
CircMgr. But the current design, where it goes into preemptive.rs and
thence to usage, seems to work fine.
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Emphasize that circuit expiration functions _decide whether to
expire the circuit_, and don't expire it automatically.
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And now the complexity begins: when the user changes the path_rules,
they not only want new circuits to obey those rules: they want
_all new requests_ to be put onto circuits that obey those rules.
That means that when the path rules become more restrictive, we need
to retire all the circuits, and make sure that currently pending
circuits aren't used for any requests.
If it's any comfort, doing this was even more complicated in C tor. ;)
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This patch doesn't actually make anything reconfigurable, but it
does create an API that will tell you "you can't change the value of
that!" If the API looks reasonable, I can start making it possible
to change the values of individual items.
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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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There seems to be some issue here with the new WaitFor code,
where using the same MockSleepProvider with both of these wait_for()
calls gives questionable behavior under some circumstances (like
when running under Tarpaulin with the wrong set of flags).
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Instead of racily advancing time forward, this commit attempts to rework
how WaitFor works, such that it makes advances when all sleeper futures
that have been created have been polled (by handing the MockSleepRuntime
a Waker with which to wake up the WaitFor).
The above described mechanics work well enough for the double timeout
test, but fail in the presence of code that spawns asynchronous /
background tasks that must make progress before time is advanced for the
test to work properly. In order to deal with these cases, a set of APIs
are introduced in order to block time from being advanced until some
code has run, and a carveout added in order to permit small advances in
time where required.
(In some cases, code needed to be hacked up a bit in order to be made
properly testable using these APIs; the `MockablePlan` trait included in
here is somewhat unfortunate.)
This should fix arti#149.
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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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