Struct ProgressToken 

pub struct ProgressToken(pub u64);

A per-turn, monotonically advancing marker of forward progress.

Why this exists (EVE-534)

A durable turn that crashes and gets reclaimed repeatedly can loop forever (re-running reason/act, burning tokens/billing) until it incidentally hits max-iterations. To defend against this poison-turn case we need a notion of progress that is:

• Derived from durably-recorded facts so it is stable under replay — the highest durable_workflow_events.sequence_num for the turn’s workflow, or equivalently the (iteration, atoms_completed, settled_tool_calls) tuple.
• Impossible to game by a non-advancing retry — re-running the same atom that crashes before recording any event leaves the token unchanged.

The token is a single u64 so the no-progress guard can compare cheaply and persist it on the task across recovery attempts. A strictly larger value means the turn advanced; an equal (or smaller) value means it did not.

Tuple Fields

0: u64

Implementations

impl ProgressToken

pub const ZERO: ProgressToken

The token before any durable fact has been recorded.

pub fn from_event_sequence(highest_sequence: i64) -> Self

Build a token from the highest durable event sequence observed for the turn. Sequence numbers are monotonic per workflow, so this is monotonic per turn. The +1 keeps ZERO reserved for “no events yet” while a missing/-1 sequence maps to ZERO.

pub fn advanced_from(&self, prev: ProgressToken) -> bool

Returns true if self represents strictly more progress than prev.

Trait Implementations

impl Clone for ProgressToken

fn clone(&self) -> ProgressToken

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ProgressToken

impl Debug for ProgressToken

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ProgressToken

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ProgressToken

impl Ord for ProgressToken

fn cmp(&self, other: &ProgressToken) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ProgressToken

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for ProgressToken

fn partial_cmp(&self, other: &ProgressToken) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for ProgressToken

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ProgressToken