Struct VarDefinition

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pub struct VarDefinition {
    pub name: &'static UncasedStr,
    pub description: &'static str,
    pub user_visible: bool,
    pub value: VarDefaultValue,
    pub constraint: Option<ValueConstraint>,
    pub require_feature_flag: Option<&'static FeatureFlag>,
    parse: fn(VarInput<'_>) -> Result<Box<dyn Value>, VarParseError>,
    type_name: fn() -> Cow<'static, str>,
}
Expand description

Definition of a variable.

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§name: &'static UncasedStr

Name of the variable, case-insensitive matching.

§description: &'static str

Description of the variable.

§user_visible: bool

Is the variable visible to users, when false only visible to system users.

§value: VarDefaultValue

Default compiled in value for this variable.

§constraint: Option<ValueConstraint>

Constraint that must be upheld for this variable to be valid.

§require_feature_flag: Option<&'static FeatureFlag>

When set, prevents getting or setting the variable unless the specified feature flag is enabled.

§parse: fn(VarInput<'_>) -> Result<Box<dyn Value>, VarParseError>

Method to parse VarInput into a type that implements Value.

The reason parse exists as a function pointer is because we want to achieve two things:

  1. VarDefinition has no generic parameters.
  2. Value::parse returns an instance of Self. VarDefinition holds a dyn Value, but Value::parse is not object safe because it returns Self, so we can’t call that method. We could change Value::parse to return a Box<dyn Value> making it object safe, but that creates a footgun where it’s possible for Value::parse to return a type that isn’t Self, e.g. <String as Value>::parse could return a usize!

So to prevent making VarDefinition generic over some type V: Value, but also defining Value::parse as returning Self, we store a static function pointer to the parse implementation of our default value.

§type_name: fn() -> Cow<'static, str>

Returns a human readable name for the type of this variable. We store this as a static function pointer for the same reason as parse.

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impl VarDefinition

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pub const fn new<V: Value>( name: &'static str, value: &'static V, description: &'static str, user_visible: bool, ) -> Self

Create a new VarDefinition in a const context with a value known at compile time.

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pub const fn new_lazy<V: Value, L: LazyValueFn<V>>( name: &'static str, _value: L, description: &'static str, user_visible: bool, ) -> Self

Create a new VarDefinition in a const context with a lazily evaluated value.

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pub fn new_runtime<V: Value>( name: &'static str, value: V, description: &'static str, user_visible: bool, ) -> Self

Create a new VarDefinition with a value known at runtime.

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pub const fn with_constraint<V: Value, D: DomainConstraint<Value = V>>( self, constraint: &'static D, ) -> Self

TODO(parkmycar): Refactor this method onto a VarDefinitionBuilder that would allow us to constrain V here to be the same V used in VarDefinition::new.

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pub const fn fixed(self) -> Self

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pub const fn read_only(self) -> Self

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pub const fn with_feature_flag(self, feature_flag: &'static FeatureFlag) -> Self

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pub fn parse(&self, input: VarInput<'_>) -> Result<Box<dyn Value>, VarError>

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pub fn default_value(&self) -> &dyn Value

Trait Implementations§

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impl Clone for VarDefinition

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fn clone(&self) -> VarDefinition

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for VarDefinition

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fn fmt(&self, __f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Var for VarDefinition

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fn name(&self) -> &'static str

Returns the name of the configuration parameter.
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fn value(&self) -> String

Constructs a flattened string representation of the current value of the configuration parameter. Read more
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fn description(&self) -> &'static str

Returns a short sentence describing the purpose of the configuration parameter.
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fn type_name(&self) -> Cow<'static, str>

Returns the name of the type of this variable.
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fn visible(&self, user: &User, system_vars: &SystemVars) -> Result<(), VarError>

Indicates wither the Var is visible as a function of the user and system_vars. “Invisible” parameters return VarErrors. Read more
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fn is_unsafe(&self) -> bool

Reports whether the variable is only visible in unsafe mode.
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fn as_var(&self) -> &dyn Var
where Self: Sized,

Upcast self to a dyn Var, useful when working with multiple different implementors of Var.

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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where T: Any,

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<T> AsAny for T
where T: Any,

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fn as_any(&self) -> &(dyn Any + 'static)

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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

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fn type_name(&self) -> &'static str

Gets the type name of self
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impl<T> Borrow<T> for T
where T: ?Sized,

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Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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fn cast_into(self) -> U

Performs the cast.
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Converts self into T using Into<T>. Read more
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fn is<T>(&self) -> bool
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Returns true if the boxed type is the same as T. Read more
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Forward to the method defined on the type Any.
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Forward to the method defined on the type Any.
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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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Causes self to use its Octal implementation when Debug-formatted.
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Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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Returns the argument unchanged.

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Converts to this type from a reference to the input type.
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Calls U::from(self).

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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Wrap the input message T in a tonic::Request
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Decompress response bodies. Read more
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fn trace_for_http(self) -> Trace<Self, SharedClassifier<ServerErrorsAsFailures>>
where Self: Sized,

High level tracing that classifies responses using HTTP status codes. Read more
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fn trace_for_grpc(self) -> Trace<Self, SharedClassifier<GrpcErrorsAsFailures>>
where Self: Sized,

High level tracing that classifies responses using gRPC headers. Read more
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fn follow_redirects(self) -> FollowRedirect<Self>
where Self: Sized,

Follow redirect resposes using the Standard policy. Read more
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> Data for T
where T: Clone + 'static,

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impl<T> MaybeSend for T
where T: Send,