Enum StoreError 

pub enum StoreError {
    SequenceConflict {
        expected: u64,
        found: u64,
    },
    NotFound {
        workflow_id: WorkflowId,
    },
    AssistantSessionNotFound {
        session_id: String,
    },
    NotOwner {
        shard: usize,
    },
    InvalidQuery(String),
    Backend(String),
    Serialization(String),
}

Errors returned by crate::ReadableEventStore and crate::EventStore implementations.

Variants

SequenceConflict

The workflow history head did not match the caller’s optimistic-concurrency guard.

Fields

expected: u64

Sequence number the caller expected to be the current workflow head.

found: u64

Sequence number currently stored as the workflow head.

NotFound

Reserved for operations that target a must-exist workflow; read and query methods return empty results, not NotFound, for absent workflows.

Fields

workflow_id: WorkflowId

Workflow identifier targeted by the must-exist operation.

AssistantSessionNotFound

An assistant-session transcript append named a session with no record.

Deliberately NOT a silent create: a transcript with no session record is a conversation with no owner, no harness and no subject, which every read surface would then have to invent an answer for. Shaped like Self::NotFound — the must-exist refusal — but carrying a session id rather than a workflow id, because an assistant session is not a workflow and has no workflow identity to borrow.

Fields

session_id: String

The session the append or mutation targeted.

NotOwner

The targeted shard is owned by a different node: a quorum write was fenced because this node is not the current owner of the workflow’s shard. Unlike Self::Backend this is a typed, retryable routing signal — the caller (or the request-routing edge) should re-resolve the shard’s owner and retry or forward, rather than treating it as an opaque internal failure. Emitted only on the distributed ([store.cluster]) replication path.

Fields

shard: usize

The distribution shard the fenced workflow’s durable state lives on.

InvalidQuery(String)

A list request the store refuses on its face: a zero page limit, or a cursor that was not minted under the request’s own namespace, filter, and sort. Never a backend fault; the caller’s input is wrong.

Backend(String)

Backend-specific failure mapped into the store contract’s closed error surface.

Serialization(String)

Serialization or deserialization failure while crossing the store boundary.

Trait Implementations

impl Clone for StoreError

fn clone(&self) -> StoreError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StoreError

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

Formats the value using the given formatter.

impl Display for StoreError

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

Formats the value using the given formatter.

impl Eq for StoreError

impl Error for StoreError

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 StoreError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for StoreError