Enum GrantChainError 

pub enum GrantChainError {
    Empty,
    BadTimestamp {
        index: usize,
    },
    ScopeWidened {
        parent: usize,
    },
    ExpiryWidened {
        parent: usize,
    },
    DepthNotIncremented {
        parent: usize,
    },
    DepthExceedsMax {
        parent: usize,
    },
    AudienceChanged {
        parent: usize,
    },
    ObjectiveChanged {
        parent: usize,
    },
}

Why a grant chain failed its attenuation invariants.

Variants

Empty

Chain was empty.

BadTimestamp

A grant carried an unparseable issued_at/expiry.

Fields

index: usize

ScopeWidened

child.scope is not a subset of parent.scope.

Fields

parent: usize

ExpiryWidened

child.expiry is later than parent.expiry.

Fields

parent: usize

DepthNotIncremented

child.delegation_depth is not exactly parent.delegation_depth + 1.

Fields

parent: usize

DepthExceedsMax

child.delegation_depth exceeds parent.max_delegation.

Fields

parent: usize

AudienceChanged

child.audience differs from parent.audience.

Fields

parent: usize

ObjectiveChanged

The declared objective changed, or was dropped, across a delegation.

objective_hash commits to what task a grant was issued to serve. Scope says which actions are permitted; the objective says what they were permitted for. A delegation that keeps the scope and swaps the objective is authority minted for one task being spent on another – every existing check passes, because none of them look at why.

Dropping it is the same violation. A child with no objective is unconstrained by one, so removing it widens authority exactly as extending an expiry does.

Fields

parent: usize

Trait Implementations

impl Clone for GrantChainError

fn clone(&self) -> GrantChainError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GrantChainError

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

Formats the value using the given formatter.

impl Display for GrantChainError

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

parent is the index of the parent in the resolved root-first chain, so the violation is reported as the hop between it and its child – which is where an operator has to look to fix it.

impl Eq for GrantChainError

impl Error for GrantChainError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for GrantChainError

fn eq(&self, other: &GrantChainError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for GrantChainError