Enum FlowError 

#[non_exhaustive]
pub enum FlowError {
    RunNotFound(String),
    RunTerminal(String),
    InvalidRunId(String),
    ContinueAsNewCycle(String),
    ContinueAsNewLimitExceeded(usize),
    ChildWorkflowCycle(String),
    ChildWorkflowDepthExceeded(usize),
    RunConflict {
        run_id: String,
        reason: String,
    },
    InvalidRuntimeBuildId(String),
    InvalidWorkflowPatchId(String),
    RuntimeBuildUnavailable {
        run_id: String,
        required_build_id: Option<RuntimeBuildId>,
        current_build_id: Option<RuntimeBuildId>,
    },
    RuntimeBuildRouteNotFound {
        required_build_id: Option<RuntimeBuildId>,
    },
    NonDeterministic {
        run_id: String,
        reason: String,
    },
    EventConflict {
        run_id: String,
        expected_sequence: u64,
        actual_sequence: u64,
    },
    HookTokenNotFound(String),
    LeaseLost(String),
    HookTokenConflict {
        token: String,
        existing_run_id: String,
        existing_hook_id: String,
    },
    HookConflict {
        run_id: String,
        hook_id: String,
        reason: String,
    },
    SignalConflict {
        run_id: String,
        signal_id: String,
        reason: String,
    },
    InvalidWorkflow(String),
    InvalidTransition(String),
    InvalidWorkerConfiguration(String),
    TaskManagement(String),
    Store(String),
    Runtime(String),
    Serialization(Error),
    Io(Error),
    ReplayLimitExceeded(usize),
}

Errors surfaced by the workflow engine and runtime adapters.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

RunNotFound(String)

A requested workflow run does not exist.

RunTerminal(String)

An operation attempted to append work to a terminal run.

InvalidRunId(String)

A run identifier violates the storage-safe identifier contract.

ContinueAsNewCycle(String)

A continue-as-new chain contains a repeated run.

ContinueAsNewLimitExceeded(usize)

A continue-as-new chain exceeds the configured traversal bound.

ChildWorkflowCycle(String)

Parent and child ownership links contain a cycle.

ChildWorkflowDepthExceeded(usize)

A child workflow request exceeds the configured nesting bound.

RunConflict

An idempotent run start disagrees with the existing run definition.

Fields

run_id: String

Existing run identifier.

reason: String

Description of the conflicting immutable input.

InvalidRuntimeBuildId(String)

A runtime build identity is empty or malformed.

InvalidWorkflowPatchId(String)

A workflow patch identity is empty, malformed, or too long.

RuntimeBuildUnavailable

No configured runtime can replay the run’s pinned build.

Fields

run_id: String

Run that requires replay admission.

required_build_id: Option<RuntimeBuildId>

Runtime build pinned by the run, if any.

current_build_id: Option<RuntimeBuildId>

Runtime build configured on the attempted executor, if any.

RuntimeBuildRouteNotFound

No task queue route is registered for a required runtime build.

Fields

required_build_id: Option<RuntimeBuildId>

Runtime build required by the task, if pinned.

NonDeterministic

Runtime replay emitted a command that conflicts with durable history.

Fields

run_id: String

Run whose replay diverged.

reason: String

Description of the durable command mismatch.

EventConflict

An optimistic event append used a stale expected sequence.

Fields

run_id: String

Run whose history changed concurrently.

expected_sequence: u64

Last sequence assumed by the caller.

actual_sequence: u64

Last sequence currently stored.

HookTokenNotFound(String)

The original token remains available for programmatic routing, while Display and Debug deliberately redact it.

LeaseLost(String)

A queue lease was lost before its task could be acknowledged.

HookTokenConflict

The conflicting token remains available for programmatic handling, while Display and Debug deliberately redact it.

Fields

token: String

Conflicting bearer token, retained only for programmatic recovery.

existing_run_id: String

Run that already owns the token.

existing_hook_id: String

Hook that already owns the token.

HookConflict

A hook retry conflicts with its durable identity or resolution.

Fields

run_id: String

Run that owns the hook.

hook_id: String

Replay-stable hook identity.

reason: String

Description of the conflicting request.

SignalConflict

A signal retry conflicts with its durable identity or payload.

Fields

run_id: String

Run targeted by the signal.

signal_id: String

Caller-owned signal identity.

reason: String

Description of the conflicting delivery.

InvalidWorkflow(String)

A workflow definition violates a static invariant.

InvalidTransition(String)

An event or command violates the current durable state.

InvalidWorkerConfiguration(String)

Worker settings cannot provide the requested execution guarantees.

TaskManagement(String)

An external task manager rejected or failed an operation.

Store(String)

A durable event store rejected or failed an operation.

Runtime(String)

A workflow or step runtime failed outside application commands.

Serialization(Error)

JSON serialization or deserialization failed.

Io(Error)

Filesystem, process, or stream I/O failed.

ReplayLimitExceeded(usize)

Replay emitted more commands than the configured safety bound.

Trait Implementations

impl Debug for FlowError

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

Formats the value using the given formatter.

impl Display for FlowError

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

Formats the value using the given formatter.

impl Error for FlowError

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 From<Error> for FlowError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for FlowError

fn from(source: Error) -> Self

Converts to this type from the input type.