These new (internal so far) APIs correspond more closely to what
we'll need for AsyncRead and AsyncWrite.
We also make write methods take a mutable reference to self, since
that seems to be (closer to) what the AsyncRead/AsyncWrite code
expects.
This is fairly ugly and I think I'll need to mess around with the
feature configuration a while until we get something that's pleasant
to develop with. This still seems like a good idea, though, since
we _will_ need to be executor-agnostic in the end, or we'll have no
way to handle wasm or embedded environments.
Later down the road, we'll probably want to use futures::Executor or
futures::Spawn more than having global entry points in
tor_rtcompat. That would probably make our feature story simpler.
Tokio is the default now, since tokio seems to be more heavily used
for performance-critical stuff.
This patch breaks tests; the next one will fix them, albeit
questionably.
This affects the cache_dir and the as-yet-unused state_dir. It uses
the shellexpand and directories crates so that the default values
can be constant strings that use variables to refer to the right
default locations.
This commit adds configuration options for these values, with the
right defaults, and uses those options instead of built-in functions
to set them.
We also remove the function to extract information from chutney
directories: now that arti is configurable, it can be chutney's job
to make its own network configurations.
Nick Mathewson
George Kadianakis