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I found these versions empirically, by using the following process:
First, I used `cargo tree --depth 1 --kind all` to get a list of
every immediate dependency we had.
Then, I used `cargo upgrade --workspace package@version` to change
each dependency to the earliest version with which (in theory) the
current version is semver-compatible. IOW, if the current version
was 3.2.3, I picked "3". If the current version was 0.12.8, I
picked "0.12".
Then, I used `cargo +nightly upgrade -Z minimal-versions` to
downgrade Cargo.lock to the minimal listed version for each
dependency. (I had to override a few packages; see .gitlab-ci.yml
for details).
Finally, I repeatedly increased the version of each of our
dependencies until our code compiled and the tests passed. Here's
what I found that we need:
anyhow >= 1.0.5: Earlier versions break our hyper example.
async-broadcast >= 0.3.2: Earlier versions fail our tests.
async-compression 0.3.5: Earlier versions handled futures and tokio
differently.
async-trait >= 0.1.2: Earlier versions are too buggy to compile our
code.
clap 2.33.0: For Arg::default_value_os().
coarsetime >= 0.1.20: exposed as_ticks() function.
curve25519-dalek >= 3.2: For is_identity().
generic-array 0.14.3: Earlier versions don't implement
From<&[T; 32]>
httparse >= 1.2: Earlier versions didn't implement Error.
itertools at 0.10.1: For at_most_once.
rusqlite >= 0.26.3: for backward compatibility with older rustc.
serde 1.0.103: Older versions break our code.
serde_json >= 1.0.50: Since we need its Value type to implement Eq.
shellexpand >= 2.1: To avoid a broken dirs crate version.
tokio >= 1.4: For Handle::block_on().
tracing >= 0.1.18: Previously, tracing_core and tracing had separate
LevelFilter types.
typenum >= 1.12: Compatibility with rust-crypto crates
x25519-dalek >= 1.2.0: For was_contributory().
Closes #275.
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This implements a basic typed event broadcast mechanism, as described in
arti#230: consumers of the new `tor-events` crate can emit `TorEvent`
events, which others can consume via the `TorEventReceiver`.
Under the hood, the crate uses the `async-broadcast`
(https://github.com/smol-rs/async-broadcast) crate, and a
`futures::mpsc::UnboundedSender` for the event emitters; these are glued
together in the `EventReactor`, which must be run in a background thread
for things to work. (This is done so event sending is always cheap and
non-blocking, since `async-broadcast` senders don't have this
functionality.)
Additionally, the `TorEventKind` type is used to implement selective
event reception / emission: receivers can subscribe to certain event
types (and in fact start out receiving nothing), which filters the set
of events they receive. Having no subscribers for a given event type
means it won't even be emitted in the first place, making things more
efficient.
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