Enum Event 

pub enum Event {
    StateChanged {
        from: NodeState,
        to: NodeState,
    },
    PayloadReceived(DeliveredPayload),
    Control {
        from: MemberId,
        opcode: ControlOpcode,
        transition_id: TransitionId,
        request_id: u32,
        args: Vec<u8>,
    },
    Error {
        code: u16,
        class: ErrorClass,
        retryable: bool,
        fatal: bool,
        reason: String,
    },
    EpochAdvanced {
        epoch: u64,
        transition_id: TransitionId,
    },
    CoordinatorElectionNeeded,
    BecameCoordinator,
    CoordinatorClaim {
        claimant: MemberId,
    },
}

Events surfaced by the GBP layer.

Variants

StateChanged

Node FSM changed state.

Fields

from: NodeState

Previous state.

to: NodeState

New state.

PayloadReceived(DeliveredPayload)

Payload delivered to a sub-protocol (Text / Audio / Signal). Control frames are handled internally and do not surface as Event::PayloadReceived.

Control

A control plane message was received and parsed.

Fields

from: MemberId

Sender member id.

opcode: ControlOpcode

Decoded opcode.

transition_id: TransitionId

transition_id carried by the message.

request_id: u32

request_id echoed by ACK / NACK responders.

args: Vec<u8>

Opcode-specific args (CBOR or opaque bytes; e.g. the MLS Commit embedded in PREPARE_TRANSITION).

Error

An error was raised.

Fields

code: u16

Numeric error code.

class: ErrorClass

Error class.

retryable: bool

MAY be retried.

fatal: bool

Fatal — the node is now in FAILED.

reason: String

Human-readable reason.

EpochAdvanced

Epoch transition has been applied locally.

Fields

epoch: u64

New epoch.

transition_id: TransitionId

transition_id that produced the new epoch.

CoordinatorElectionNeeded

Coordinator silence exceeded T_coordinator_grace. The application should call GroupNode::claim_coordinator if this node has the lowest MemberId among currently active members.

BecameCoordinator

This node successfully claimed the coordinator role (sent CAPABILITIES_ADVERTISE with coordinator_claim=true).

CoordinatorClaim

A remote member broadcast a coordinator claim.

Fields

claimant: MemberId

The claiming member’s id.

Trait Implementations

impl Clone for Event

fn clone(&self) -> Event

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Event

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

Formats the value using the given formatter.