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See #2060.
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This type differs from `NamedSubver` in that the represented
subprotocol capability isn't necessarily recognized or valid.
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It is not remotely close to exhausting a u8,
and several of our protocols expect it to be expressible as one.
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This rule makes PartialEq more sensible.
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Part of #1849.
Note that these functions are distributed across crates,
so that if (in the future) we stop doing API breaks
with every release, we will get the right outputs.
Note also that these functions build the list of protocols
out of specific symbolic features, rather than numbers:
this makes it easier to avoid errors about "which feature was
Relay=4 again", and easier to avoid accidentally referring to a
protocol that doesn't exist, like "Consensus" (should be "Cons")
or "HsDir" (case is wrong).
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Closes #1923
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We have places where, if we were to create certain ProtoKinds
or NamedProtos with invalid values, we could cause a panic.
This isn't remotely triggerable, or even triggerable from outside
the protover crate, but it's best to avoid the possibility
of future mistakes.
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This will be helpful in building a list of protocols
from several crates.
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This will be helpful in building a list of protocols
from several crates.
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This will be helpful in checking whether a list of protocols
has any unsupported members.
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It's error-prone to have to remember e.g. that "Desc=5"
means "family ID support", so in torspec!251 we added mnemonic names
like DESC_FAMILY_IDS.
Here we use those names in tor-protover.
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Denies 'mod.rs' files for consistency.
https://rust-lang.github.io/rust-clippy/master/index.html#mod_module_files
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In 1.83, this warning triggers on many of our crates.
We're thinking of fixing them all, but for now,
we're going to disable the warning.
This is part of #1765.
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This commit is automatically generated.
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Closes #950.
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This panics on error, and we're fine with a panic on misbehavior in
tests.
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This warning kind of snuck up on us! (See #748) For now, let's
disable it. (I've cleaned it up in a couple of examples, since
those are meant to be more idiomatic and user-facing.)
Closes #748.
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This is precisely the result of running the rune in
maint/adhoc-add-lint-blocks.
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Apparently cargo fmt doesn't like these, which my perl rune didn't
delete.
This commit is precisely the result of `cargo fmt`.
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The feature we want is `#[doc = include_str!("README.md")]`, which is
stable since 1.54 and our MSRV is now 1.56.
This commit is precisely the result of the following Perl rune:
perl -i~ -0777 -pe 's{(^//!(?!.*\@\@).*\n)+}{#![doc = include_str!("../README.md")]\n}m' crates/*/src/lib.rs
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Update all lint blocks
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These need to survive.
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From running add_warning, with manual picking of the right
hunks/lines.
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This was the result of:
maint/add_warning crates/*/src/{lib,main}.rs
and then manually curating the results.
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This should save around 1MB per consensus, since every relay has a
'protocols' lines, but there are only a few distinct possibilities
for such a line.
Closes #385.
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This lint is IMO inherently ill-conceived.
I have looked for the reasons why this might be thought to be a good
idea and there were basically two (and they are sort of contradictory):
I. "Calling ‘.clone()` on an Rc, Arc, or Weak can obscure the fact
that only the pointer is being cloned, not the underlying data."
This is the wording from
https://rust-lang.github.io/rust-clippy/v0.0.212/#clone_on_ref_ptr
It is a bit terse; we are left to infer why it is a bad idea to
obscure this fact. It seems to me that if it is bad to obscure some
fact, that must be because the fact is a hazard. But why would it be
a hazard to not copy the underlying data ?
In other languages, faliing to copy the underlying data is a serious
correctness hazard. There is a whose class of bugs where things were
not copied, and then mutated and/or reused in multiple places in ways
that were not what the programmer intended. In my experience, this is
a very common bug when writing Python and Javascript. I'm told it's
common in golang too.
But in Rust this bug is much much harder to write. The data inside an
Arc is immutable. To have this bug you'd have use interior mutability
- ie mess around with Mutex or RefCell. That provides a good barrier
to these kind of accidents.
II. "The reason for writing Rc::clone and Arc::clone [is] to make it
clear that only the pointer is being cloned, as opposed to the
underlying data. The former is always fast, while the latter can
be very expensive depending on what is being cloned."
This is the reasoning found here
https://github.com/rust-lang/rust-clippy/issues/2048
This is saying that *not* using Arc::clone is hazardous.
Specifically, that a deep clone is a performance hazard.
But for this argument, the lint is precisely backwards. It's linting
the "good" case and asking for it to be written in a more explicit
way; while the supposedly bad case can be written conveniently.
Also, many objects (in our codebase, and in all the libraries we use)
that are Clone are in fact simply handles. They contain Arc(s) (or
similar) and are cheap to clone. Indeed, that is the usual case.
It does not make sense to distinguish in the syntax we use to clone
such a handle, whether the handle is a transparent Arc, or an opaque
struct containing one or more other handles.
Forcing Arc::clone to be written as such makes for code churn when a
type is changed from Arc<Something> to Something: Clone, or vice
versa.
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Refactor errors in tor-netdoc
See merge request tpo/core/arti!314
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This error type doesn't impement HasKind, since the kind will depend
on context.
However, the existing implementation was pretty messy and inconsistent:
Some errors had positions, some didn't.
Some took messages as str, some as String.
Some had internal errors that were somewhat orthogonal to their actual
types.
This commit refactors tor_netdoc::Error to use a ParseErrorKind, and
adds a set of convenience functions to add positions and
messages to the errors that need them.
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Closes #338.
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