Enum DurabilityDeclError 

pub enum DurabilityDeclError {
    RetiredAnnotation {
        key: String,
        field: &'static str,
    },
    MissingStore {
        tier: DurabilityTier,
    },
    StoreWithoutTier,
    RpoOnNonStreamTier {
        tier: DurabilityTier,
    },
    MissingEngine {
        tier: DurabilityTier,
    },
    EngineWithoutTier,
    MissingSubjects {
        tier: DurabilityTier,
    },
    SubjectsWithoutTier,
    EmptySubject,
    AbsoluteSubject {
        subject: String,
    },
    TraversingSubject {
        subject: String,
    },
    DuplicateSubject {
        subject: String,
    },
}

A durability declaration that cannot be acted on.

Every variant is a refusal to guess. The alternative — falling back to “undeclared” on a malformed value, the way WorkloadSpec::memory_request_mb falls back to its ceiling — is safe there and unsafe here: a mistyped memory request costs a placement, a mistyped durability tier costs the database. (An unknown tier or engine, or a non-numeric RPO, no longer reaches this type: those are serde refusals on the typed field.)

Variants

RetiredAnnotation

R896-F3: the spec still declares durability through the retired yah.durability.* annotations. Nothing reads them, so passing the spec would silently mean “no backup”.

Fields

key: String

field: &'static str

MissingStore

A tier that ships bytes with nowhere to ship them.

Fields

tier: DurabilityTier

StoreWithoutTier

tier = "none" with a store — contradictory, and the reader cannot tell which half is the mistake.

RpoOnNonStreamTier

An RPO on a tier that has no bounded loss window to state.

Fields

tier: DurabilityTier

MissingEngine

R850-F1: a bytes-shipping tier with no engine. The tier names are turso-backup’s; a spec that means a different engine has to say so.

Fields

tier: DurabilityTier

EngineWithoutTier

R850-F1: an engine alongside tier = "none" — nothing ships, so there is nothing for an engine to be the engine of.

MissingSubjects

R850-F1: a bytes-shipping tier that names no database files.

Fields

tier: DurabilityTier

SubjectsWithoutTier

R850-F1: subjects alongside tier = "none".

EmptySubject

R850-F1: a blank entry in the subject list. Skipping it silently would hide a truncated list.

AbsoluteSubject

R850-F1: a subject that is not volume-relative.

Fields

subject: String

TraversingSubject

R850-F1: a subject containing a . or .. component.

Fields

subject: String

DuplicateSubject

R850-F1: the same subject listed twice — it would be backed up twice under one key and restored twice over itself.

Fields

subject: String

Trait Implementations

impl Clone for DurabilityDeclError

fn clone(&self) -> DurabilityDeclError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DurabilityDeclError

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

Formats the value using the given formatter.

impl Display for DurabilityDeclError

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

Formats the value using the given formatter.

impl Eq for DurabilityDeclError

impl Error for DurabilityDeclError

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 DurabilityDeclError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for DurabilityDeclError