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Onion services (and later, exits and caches) will need this.
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This commit addresses multiple problems highlighted by arti#182:
- `arti-client` had some types in its public API that weren't accessible
without importing another crate (`CfgPath`, `DataReader`,
`DataWriter`). This has been fixed.
- In addition, the doc comments for `DataReader` and `DataWriter` were
cleaned up to be of better quality, now that they're public.
- It was impossible to use `arti-client` without also importing
`tor-rtcompat`. This is now fixed by the addition of two convenience
methods: `TorClient::bootstrap_with_tokio` and
`TorClient::bootstrap_with_async_std`.
- Potentially controversially: `tor-rtcompat` now returns *concrete*
types from methods like `current_runtime`, instead of `impl Runtime`.
- This was needed in order to actually be able to name the `TorClient`
type that results from using these methods.
- This does mean we lose API flexibility, but on balance I think this
is a good thing, because the API we *do* have is actually usable...
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Previously, the reactor would use an `UnboundedSender` to send things to
the `RawCellStream`, in order that the reactor wouldn't block if you
failed to read from the latter. This is bad, though, since it means
people can just run us out of memory by sending lots of things.
To fix this, we make the new `StreamReader` type (which does the reading
parts from `RawCellStream`) keep track of the stream's receive window
and issue SENDMEs once *it* has consumed enough data to require it, thus
meaning that we shouldn't get sent enough data to fill the channel
between reactor and `StreamReader` (and, if we do, that's someone trying
to flood us, and we abort the circuit).
As hinted to above, the `RawCellStream` was removed and its reading
functionalities replaced by `StreamReader`; its writing functionalities
are handled by `StreamTarget` anyway, so we just give out one of those
for the write end. This now means we don't need any mutexes!
note: this commit introduces a known issue, arti#230
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It seems like a good time to do this, before we add a zillion other
arguments to begin_stream.
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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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