Enum ProtocolMessage 

pub enum ProtocolMessage {
    Handshake {
        node_name: String,
        group_name: String,
        node_type: NodeType,
    },
    HandshakeResponse {
        accepted: bool,
        reason: Option<String>,
    },
    Heartbeat {
        master_vlsn: u64,
        timestamp_ms: u64,
    },
    HeartbeatResponse {
        replica_vlsn: u64,
        timestamp_ms: u64,
    },
    LogEntry {
        vlsn: u64,
        entry_type: u8,
        data: Vec<u8>,
    },
    Ack {
        vlsn: u64,
    },
    GroupChange {
        change_type: GroupChangeType,
        node: RepNode,
    },
    GroupChangeResponse {
        accepted: bool,
    },
    ElectionProposal {
        node_name: String,
        vlsn: u64,
        priority: u32,
        term: u64,
        dtvlsn: u64,
    },
    ElectionVote {
        voter: String,
        granted: bool,
        term: u64,
    },
    ElectionResult {
        master: String,
        term: u64,
    },
    Shutdown {
        reason: String,
    },
}

A message in the replication protocol.

These messages are exchanged between master and replica nodes for handshaking, heartbeats, log replication, elections, and group management.

Variants

Handshake

Initial handshake from a node joining the replication stream.

Fields

node_name: String

group_name: String

node_type: NodeType

HandshakeResponse

Response to a handshake.

Fields

accepted: bool

reason: Option<String>

Heartbeat

Heartbeat from master to replica.

Fields

master_vlsn: u64

timestamp_ms: u64

HeartbeatResponse

Heartbeat response from replica to master.

Fields

replica_vlsn: u64

timestamp_ms: u64

LogEntry

A log entry being replicated from master to replica.

Fields

vlsn: u64

entry_type: u8

data: Vec<u8>

Ack

Acknowledgment of a replicated log entry.

Fields

vlsn: u64

GroupChange

A group membership change request.

Fields

change_type: GroupChangeType

node: RepNode

GroupChangeResponse

Response to a group change request.

Fields

accepted: bool

ElectionProposal

An election proposal from a candidate.

Fields

node_name: String

vlsn: u64

priority: u32

term: u64

dtvlsn: u64

DTVLSN (the major election-ranking key, D2). 0 = UNINITIALIZED.

ElectionVote

A vote in response to an election proposal.

Fields

voter: String

granted: bool

term: u64

ElectionResult

The result of an election.

Fields

master: String

term: u64

Shutdown

Graceful shutdown notification.

Fields

reason: String

Implementations

impl ProtocolMessage

pub fn encode(&self) -> Vec<u8>

Encodes this message into a byte vector.

Format: [tag: u8][payload...] Strings are encoded as [len: u32 LE][utf8 bytes]. Booleans as a single byte (0 or 1). Integers as little-endian fixed-width.

pub fn decode(data: &[u8]) -> Result<Self>

Decodes a message from a byte slice.

Trait Implementations

impl Clone for ProtocolMessage

fn clone(&self) -> ProtocolMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProtocolMessage

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

Formats the value using the given formatter.

impl PartialEq for ProtocolMessage

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ProtocolMessage