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The information is pretty basic here: we use "have we been able to
connect/TLS-handshake/Tor-handshake" as a proxy for "are we on the
internet? Are we on a reasonably unfiltered part of the internet?"
Eventually we'll want to make the information gathered and exported
more detailed: I've noted a few places in the code. For now,
however, this is about as good as C Tor does today, and it should be
a good starting point.
This uses a slightly different design from tor-dirmgr. Instead of
exporting an entire state structure via `postage::watch`, it exports
only the parts of that structure which the user is supposed to
read. I think that's more reasonable in this case because most of
the possible internal transitions in the tor-chanmgr state don't
cause a change in the exposed status.
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`tor-rtcompat`'s `TlsConnector` trait previously included a method to
create a TLS-over-TCP connection, which implied creating a TCP stream
inside that method. This commit changes that, and makes the function
wrap a TCP stream, as returned from the runtime's `TcpProvider` trait
implementation, instead.
This means you can actually override `TcpProvider` and have it apply to
*all* connections Arti makes, which is useful for issues like arti#235
and other cases where you want to have a custom TCP stream
implementation.
This required updating the mock TCP/TLS types in `tor-rtmock` slightly;
due to the change in API, we now store whether a `LocalStream` should
actually be a TLS stream inside the stream itself, and check this
property on reads/writes in order to detect misuse. The fake TLS wrapper
checks this property and removes it in order to "wrap" the stream,
making reads and writes work again.
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Instead of awkwardly sharing the internals of a `tor-proto` `Channel`
between the reactor task and any other tasks, move most of the internals
into the reactor and have other tasks communicate with the reactor via
message-passing to allocate circuits and send cells.
This makes a lot of things simple, and has convenient properties like
not needing to wrap the `Channel` in an `Arc` (though some places in the
code still do this for now).
A lot of test code required tweaking in order to deal with the refactor;
in fact, fixing the tests probably took longer than writing the mainline
code (!). Importantly, we now use `tokio`'s `tokio::test` annotation
instead of `async_test`, so that we can run things in the background
(which is required to have reactors running for the circuit tests).
This is an instance of #205, and also kind of #217.
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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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