Unfortunately we need to pull tracing-opentelemetry from git because
there hasn't been a release including the dependency bump on the other
opentelemetry crates.
Also adds a utility for formatting an error message in addition to all
of its sources, i.e. errors that came before it that led to the current
error.
This helps us to provide better error messages to users by including
more information: both our own error message and all of the underlying
error messages, if any, instead of only one or the other.
`panic!()` (and things that invoke it, such as `expect` and `unwrap`)
produces terrible looking error messages and `std::process::exit()`
doesn't run destructors. Instead, we'll make a `try_main` that can
return a `Result` with a structured error type, but for now I'm going to
be lazy and just use `Box<dyn Error>`. Then, `main` will call it and
return the appropriate `ExitCode` value based on `try_main`'s `Result`.
This gives us the opportunity to produce good error messages and doesn't
violently terminate the program.
This allows us to use the `ruma_route` convenience function even when we
need to add our own hacks into the responses, thus making us less
reliant on Ruma.
This change is fully automated, except the `rustfmt.toml` changes and
a few clippy directives to allow specific functions with too many lines
because they are longer now.
This drastically reduces the maintenance burden.
You may notice the `CODE_OF_CONDUCT.md` is deleted here. This is because
I don't feel like updating the relevant parts and I don't think this
will ever actually have a community build around it. If that changes for
some reason, I'm not opposed to adding a code of conduct again.
I removed some lint configuration in the process:
* `#[allow(clippy::suspicious_else_formatting)]` because nothing is
currently triggering it.
* `#[warn(clippy::future_not_send)]` because some stuff under
`src/lib.rs` is. And also like, auto-trait leakage generally means
this isn't a problem, and if things really need to be `Send`, then
you'll probably know to mark it manually.
* `#[warn(rust_2018_idioms)]` and replaced it with
`explicit-outlives-requirements = "warn"` which is the most useful
lint in that group that isn't enabled by default.
