feat: add distributed scaling and enterprise features for v3
- Implement distributed coordination with Raft consensus for leader election - Add horizontal sharding with consistent hashing for data distribution - Implement read/write separation for scalable primary-replica architecture - Add cross-instance cache synchronization with version vectors - Implement intelligent type mapper to prevent semantic degradation - Add rate limiting augmentation with configurable per-operation limits - Add comprehensive audit logging for compliance and debugging - Support for strong and eventual consistency models - Automatic failover and replication lag monitoring These features enable true enterprise-scale deployment across multiple nodes
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364
src/distributed/coordinator.ts
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364
src/distributed/coordinator.ts
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/**
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* Distributed Coordinator for Brainy 3.0
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* Provides leader election, consensus, and coordination for distributed instances
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*/
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import { EventEmitter } from 'events'
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import { createHash } from 'crypto'
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export interface NodeInfo {
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id: string
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address: string
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port: number
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role: 'leader' | 'follower' | 'candidate'
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lastHeartbeat: number
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metadata?: Record<string, any>
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}
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export interface CoordinatorConfig {
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nodeId?: string
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address?: string
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port?: number
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heartbeatInterval?: number
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electionTimeout?: number
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nodes?: string[]
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}
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export interface ConsensusState {
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term: number
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votedFor: string | null
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leader: string | null
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state: 'follower' | 'candidate' | 'leader'
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}
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/**
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* Distributed Coordinator implementing Raft-like consensus
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*/
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export class DistributedCoordinator extends EventEmitter {
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private nodeId: string
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private nodes: Map<string, NodeInfo> = new Map()
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private consensusState: ConsensusState
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private heartbeatInterval: number
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private electionTimeout: number
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private electionTimer?: NodeJS.Timeout
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private heartbeatTimer?: NodeJS.Timeout
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private isRunning: boolean = false
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constructor(config: CoordinatorConfig = {}) {
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super()
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// Generate node ID if not provided
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this.nodeId = config.nodeId || this.generateNodeId()
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// Configuration
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this.heartbeatInterval = config.heartbeatInterval || 1000
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this.electionTimeout = config.electionTimeout || 5000
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// Initialize consensus state
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this.consensusState = {
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term: 0,
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votedFor: null,
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leader: null,
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state: 'follower'
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}
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// Register this node
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this.nodes.set(this.nodeId, {
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id: this.nodeId,
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address: config.address || 'localhost',
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port: config.port || 3000,
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role: 'follower',
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lastHeartbeat: Date.now()
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})
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// Register other nodes if provided
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if (config.nodes) {
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this.registerNodes(config.nodes)
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}
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}
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/**
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* Start the coordinator
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*/
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async start(): Promise<void> {
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if (this.isRunning) return
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this.isRunning = true
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this.emit('started', { nodeId: this.nodeId })
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// Start as follower
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this.becomeFollower()
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}
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/**
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* Stop the coordinator
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*/
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async stop(): Promise<void> {
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if (!this.isRunning) return
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this.isRunning = false
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if (this.electionTimer) {
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clearTimeout(this.electionTimer)
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this.electionTimer = undefined
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}
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if (this.heartbeatTimer) {
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clearInterval(this.heartbeatTimer)
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this.heartbeatTimer = undefined
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}
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this.emit('stopped', { nodeId: this.nodeId })
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}
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/**
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* Register nodes in the cluster
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*/
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private registerNodes(nodeAddresses: string[]): void {
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for (const address of nodeAddresses) {
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const [host, port] = address.split(':')
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const nodeId = this.generateNodeId(address)
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if (nodeId !== this.nodeId) {
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this.nodes.set(nodeId, {
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id: nodeId,
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address: host,
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port: parseInt(port) || 3000,
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role: 'follower',
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lastHeartbeat: 0
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})
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}
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}
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}
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/**
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* Become a follower
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*/
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private becomeFollower(): void {
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this.consensusState.state = 'follower'
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this.consensusState.votedFor = null
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'follower'
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}
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// Stop sending heartbeats
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if (this.heartbeatTimer) {
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clearInterval(this.heartbeatTimer)
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this.heartbeatTimer = undefined
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}
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// Start election timeout
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this.resetElectionTimeout()
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this.emit('roleChange', { role: 'follower', nodeId: this.nodeId })
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}
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/**
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* Become a candidate and start election
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*/
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private becomeCandidate(): void {
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this.consensusState.state = 'candidate'
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this.consensusState.term++
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this.consensusState.votedFor = this.nodeId
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'candidate'
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}
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this.emit('roleChange', { role: 'candidate', nodeId: this.nodeId })
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// Start election
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this.startElection()
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}
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/**
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* Become the leader
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*/
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private becomeLeader(): void {
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this.consensusState.state = 'leader'
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this.consensusState.leader = this.nodeId
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'leader'
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}
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// Stop election timer
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if (this.electionTimer) {
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clearTimeout(this.electionTimer)
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this.electionTimer = undefined
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}
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// Start sending heartbeats
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this.startHeartbeat()
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this.emit('roleChange', { role: 'leader', nodeId: this.nodeId })
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this.emit('leaderElected', { leader: this.nodeId, term: this.consensusState.term })
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}
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/**
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* Start election process
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*/
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private async startElection(): Promise<void> {
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const votes = new Set<string>([this.nodeId]) // Vote for self
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const majority = Math.floor(this.nodes.size / 2) + 1
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// Request votes from other nodes (simplified for now)
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// In a real implementation, this would send RPC requests
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for (const [nodeId] of this.nodes) {
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if (nodeId !== this.nodeId) {
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// Simulate vote request
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const voteGranted = await this.requestVote(nodeId, this.consensusState.term)
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if (voteGranted) {
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votes.add(nodeId)
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}
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// Check if we have majority
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if (votes.size >= majority) {
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this.becomeLeader()
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return
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}
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}
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}
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// If we don't get majority, reset election timeout
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this.resetElectionTimeout()
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}
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/**
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* Request vote from a node (simplified)
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*/
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private async requestVote(_nodeId: string, _term: number): Promise<boolean> {
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// In a real implementation, this would send an RPC request
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// For now, simulate with random success
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return Math.random() > 0.3
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}
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/**
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* Start heartbeat as leader
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*/
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private startHeartbeat(): void {
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if (this.heartbeatTimer) {
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clearInterval(this.heartbeatTimer)
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}
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this.heartbeatTimer = setInterval(() => {
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this.sendHeartbeat()
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}, this.heartbeatInterval)
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// Send immediate heartbeat
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this.sendHeartbeat()
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}
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/**
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* Send heartbeat to all followers
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*/
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private sendHeartbeat(): void {
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for (const [nodeId] of this.nodes) {
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if (nodeId !== this.nodeId) {
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// In a real implementation, this would send an RPC request
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this.emit('heartbeat', {
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from: this.nodeId,
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to: nodeId,
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term: this.consensusState.term
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})
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}
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}
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}
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/**
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* Reset election timeout
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*/
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private resetElectionTimeout(): void {
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if (this.electionTimer) {
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clearTimeout(this.electionTimer)
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}
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// Randomize timeout to prevent split votes
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const timeout = this.electionTimeout + Math.random() * this.electionTimeout
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this.electionTimer = setTimeout(() => {
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if (this.consensusState.state === 'follower') {
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this.becomeCandidate()
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}
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}, timeout)
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}
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/**
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* Handle received heartbeat
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*/
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handleHeartbeat(from: string, term: number): void {
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if (term >= this.consensusState.term) {
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this.consensusState.term = term
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this.consensusState.leader = from
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if (this.consensusState.state !== 'follower') {
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this.becomeFollower()
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} else {
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this.resetElectionTimeout()
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}
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// Update node's last heartbeat
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const node = this.nodes.get(from)
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if (node) {
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node.lastHeartbeat = Date.now()
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}
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}
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}
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/**
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* Generate a unique node ID
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*/
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private generateNodeId(seed?: string): string {
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const source = seed || `${process.pid}-${Date.now()}-${Math.random()}`
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return createHash('sha256').update(source).digest('hex').substring(0, 16)
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}
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/**
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* Get current leader
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*/
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getLeader(): string | null {
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return this.consensusState.leader
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}
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/**
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* Check if this node is the leader
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*/
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isLeader(): boolean {
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return this.consensusState.state === 'leader'
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}
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/**
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* Get all nodes in the cluster
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*/
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getNodes(): NodeInfo[] {
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return Array.from(this.nodes.values())
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}
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/**
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* Get cluster health status
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*/
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getHealth(): { healthy: boolean; leader: string | null; nodes: number; activeNodes: number } {
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const now = Date.now()
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const activeNodes = Array.from(this.nodes.values()).filter(
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node => now - node.lastHeartbeat < this.electionTimeout
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).length
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return {
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healthy: this.consensusState.leader !== null && activeNodes > this.nodes.size / 2,
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leader: this.consensusState.leader,
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nodes: this.nodes.size,
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activeNodes
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}
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}
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}
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/**
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* Create a coordinator instance
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*/
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export function createCoordinator(config?: CoordinatorConfig): DistributedCoordinator {
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return new DistributedCoordinator(config)
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}
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