Now it is an Option, and is set to None if bridges aren't enabled.
This simplifies `replace_bridge_config` a bit, and forces us to
check for `None` in a few more places.
We do this by checking the FirstHops we're about to return, and when
they correspond to bridges, looking up an appropriate BridgeRelay
in the current BridgeSet (if we can).
The `GuardMgr` code has functionality to tell the DirMgr "Hey,
don't switch to the new NetDir yet: we still need more guard
information!" But we never want to do that if we're selecting
bridges, since they don't come from the NetDir.
Instead of duplicating the logic about which guard sample uses which
universe, we explicitly ask it, and then use that universe. This
will avoid trouble if/when we introduce more samples.
I'm using an Arc<[]> here though I think that there's a chance
that a simple Vec<> would suffice. Since it's an internal type,
nothing will break if we change it later.
Also, we now switch into and out of the Bridges guard sample
as needed. However, that selection is not (yet) built from the
list of bridges. That will come soon.
The first part changes which guard set is active based on based on
the parameters, which always come from a NetDir; the second changes
the contents of the active guard set, based on a Universe.
These arguments were used only for legacy (testing) purposes; the
tests now use `TestNetDirProvider`. This lets us simplify our
internal logic for passing a `NetDir` to our samples, and prepare
for having a `BridgeSet` to pass there instead.
This is a breaking change to `guardmgr` and `circmgr`.
This introduces the new API functions to Store.
But currently they are all no-ops.
So all this machinery doesn't actually do anything.
Also, it changes the API to the mockable downloader, to allow it to
support if-modified-since. So this isn't used either. But it is more
convenient to do this all at once in BridgeDescManager, since care
needs to be taken about the intraction between if-modified-since and
the persistent cache.
We use the one in the dirmgr. That means that our constructor now has
to take a dirmgr. And, the dirmgr must have a circmgr.
This is all rather odd, TBH.
Add .. to the binding of the return values from setup, as
future-proofing.
The tests now need to provide a Store too. Make the sqlite::new_empty
function pub(crate) so we can use it.
We must retain the _db_tmp_dir, since when it goes away the tmp
directory is deleted and the db goes readonly.
Nick Mathewson
Ian Jackson
Dimitris Apostolou