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Some of these were for decoding particular objects (we now say
what kind of objects), and some were unrelated tor_cert errors that
for some reason we had shoved into a tor_bytes::Error.
There is now a separate tor_cert::CertError type, independent from
tor_cert's use of `tor_bytes::Error` for parsing errors.
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This avoids adding additional information for now; that will come on
the next commits.
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This only affects uses of thread_rng(), and affects them all more or
less indiscriminately. One test does not work with
ARTI_TEST_PRNG=deterministic; the next commit will fix it.
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Now that we require Rust 1.56, we can upgrade to AES 0.8. This
forces us to have some slight API changes.
We require cipher 0.4.1, not cipher 0.4.0, since 0.4.0 has
compatibility issues with Rust 1.56.
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Remove all `use` statements for `TryFrom` and `TryInto`. These are
now redundant in Rust 2021.
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(We'll have a BadChanHandshake soon.)
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There was only one use of this, and it was in as-yet-unused relay-only
code.
Removing this type required refactoring the relay onion handshake code
to use its own error type, which is probably clever anyway.
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Found via clippy::needless_borrow. In some cases I removed needless
`[..]` too. See also:
needless_borrow suggestion doesn't go far enough
https://github.com/rust-lang/rust-clippy/issues/8389
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We generally try to track the latest rust-crypto traits when we can:
fortunately, this upgrade didn't break much, considering.
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There is now a ticket about this issue in general, at arti#254.
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We want to only use TODO in the codebase for non-blockers, and open
tickets for anything that is a bigger blocker than a TODO. These
XXXXs seem like definite non-blockers to me.
Part of arti#231.
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Rather like e8e9699c3c239d6c30f9ad414f15d3bad6ec03fd ("Get rid of
tor-proto's ChannelImpl, and use the reactor more instead"), this
admittedly rather large commit refactors the way circuits in `tor-proto`
work, centralising all of the logic in one large nonblocking reactor
which other things send messages into and out of, instead of having a
bunch of `-Impl` types that are protected by mutexes.
Congestion control becomes a lot simpler with this refactor, since the
reactor can manage both stream- and circuit-level congestion control
unilaterally without having to share this information with consumers,
meaning we can get rid of some locks.
The way streams work also changes, in order to facilitate better
handling of backpressure / fairness between streams: each stream now has
a set of channels to send and receive messages over, instead of sending
relay cells directly onto the channel (now, the reactor pulls messages
off each stream in each map, and tries to avoid doing so if it won't be
able to forward them yet).
Additionally, a lot of "close this circuit / stream" messages aren't
required any more, since that state is simply indicated by one end of a
channel going away. This should make cleanup a lot less brittle.
Getting all of this to work involved writing a fair deal of intricate
nonblocking code in Reactor::run_once that tries very hard to be mindful
of making backpressure work correctly (and congestion control); the old
code could get away with having tasks .await on things, but the new
reactor can't really do this (as it'd lock the reactor up), so has to do
everything in a nonblocking manner.
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Closes #163
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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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