claude-flow
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Ruflo - Enterprise AI agent orchestration for Claude Code. Deploy 60+ specialized agents in coordinated swarms with self-learning, fault-tolerant consensus, vector memory, and MCP integration
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text/typescript
/**
* V3 AgentDB Adapter
*
* Unified memory backend implementation using AgentDB with HNSW indexing
* for 150x-12,500x faster vector search. Implements IMemoryBackend interface.
*
* @module v3/memory/agentdb-adapter
*/
import { EventEmitter } from 'node:events';
import * as fs from 'node:fs';
import * as path from 'node:path';
import {
IMemoryBackend,
MemoryEntry,
MemoryEntryInput,
MemoryEntryUpdate,
MemoryQuery,
SearchOptions,
SearchResult,
BackendStats,
HealthCheckResult,
ComponentHealth,
MemoryType,
EmbeddingGenerator,
generateMemoryId,
createDefaultEntry,
CacheStats,
HNSWStats,
} from './types.js';
import { HNSWIndex } from './hnsw-index.js';
import { CacheManager } from './cache-manager.js';
/**
* Configuration for AgentDB Adapter
*/
export interface AgentDBAdapterConfig {
/** Vector dimensions for embeddings (default: 1536 for OpenAI) */
dimensions: number;
/** Maximum number of entries */
maxEntries: number;
/** Enable caching */
cacheEnabled: boolean;
/** Maximum cache size */
cacheSize: number;
/** Cache TTL in milliseconds */
cacheTtl: number;
/** HNSW M parameter (max connections per layer) */
hnswM: number;
/** HNSW efConstruction parameter */
hnswEfConstruction: number;
/** Default namespace */
defaultNamespace: string;
/** Embedding generator function */
embeddingGenerator?: EmbeddingGenerator;
/** Enable persistence to disk */
persistenceEnabled: boolean;
/** Persistence path */
persistencePath?: string;
}
/**
* Default configuration values
*/
const DEFAULT_CONFIG: AgentDBAdapterConfig = {
dimensions: 1536,
maxEntries: 1000000,
cacheEnabled: true,
cacheSize: 10000,
cacheTtl: 300000, // 5 minutes
hnswM: 16,
hnswEfConstruction: 200,
defaultNamespace: 'default',
persistenceEnabled: false,
};
/**
* AgentDB Memory Backend Adapter
*
* Provides unified memory storage with:
* - HNSW-based vector search (150x-12,500x faster than brute force)
* - LRU caching with TTL support
* - Namespace-based organization
* - Full-text and metadata filtering
* - Event-driven architecture
*/
export class AgentDBAdapter extends EventEmitter implements IMemoryBackend {
private config: AgentDBAdapterConfig;
private entries: Map<string, MemoryEntry> = new Map();
private index: HNSWIndex;
private cache: CacheManager<MemoryEntry>;
private namespaceIndex: Map<string, Set<string>> = new Map();
private keyIndex: Map<string, string> = new Map(); // namespace:key -> id
private tagIndex: Map<string, Set<string>> = new Map();
private initialized: boolean = false;
// Performance tracking
private stats = {
queryCount: 0,
totalQueryTime: 0,
searchCount: 0,
totalSearchTime: 0,
writeCount: 0,
totalWriteTime: 0,
};
constructor(config: Partial<AgentDBAdapterConfig> = {}) {
super();
this.config = { ...DEFAULT_CONFIG, ...config };
// Initialize HNSW index
this.index = new HNSWIndex({
dimensions: this.config.dimensions,
M: this.config.hnswM,
efConstruction: this.config.hnswEfConstruction,
maxElements: this.config.maxEntries,
metric: 'cosine',
});
// Initialize cache
this.cache = new CacheManager<MemoryEntry>({
maxSize: this.config.cacheSize,
ttl: this.config.cacheTtl,
lruEnabled: true,
});
// Forward events
this.index.on('point:added', (data) => this.emit('index:added', data));
this.cache.on('cache:hit', (data) => this.emit('cache:hit', data));
this.cache.on('cache:miss', (data) => this.emit('cache:miss', data));
}
/**
* Initialize the adapter
*/
async initialize(): Promise<void> {
if (this.initialized) return;
// Load persisted data if enabled
if (this.config.persistenceEnabled && this.config.persistencePath) {
await this.loadFromDisk();
}
this.initialized = true;
this.emit('initialized');
}
/**
* Shutdown the adapter
*/
async shutdown(): Promise<void> {
if (!this.initialized) return;
// Persist data if enabled
if (this.config.persistenceEnabled && this.config.persistencePath) {
await this.saveToDisk();
}
this.cache.shutdown();
this.initialized = false;
this.emit('shutdown');
}
/**
* Store a memory entry
*/
async store(entry: MemoryEntry): Promise<void> {
const startTime = performance.now();
// Generate embedding if content provided but no embedding
if (entry.content && !entry.embedding && this.config.embeddingGenerator) {
entry.embedding = await this.config.embeddingGenerator(entry.content);
}
// Store in main storage
this.entries.set(entry.id, entry);
// Update namespace index
const namespace = entry.namespace || this.config.defaultNamespace;
if (!this.namespaceIndex.has(namespace)) {
this.namespaceIndex.set(namespace, new Set());
}
this.namespaceIndex.get(namespace)!.add(entry.id);
// Update key index
const keyIndexKey = `${namespace}:${entry.key}`;
this.keyIndex.set(keyIndexKey, entry.id);
// Update tag index
for (const tag of entry.tags) {
if (!this.tagIndex.has(tag)) {
this.tagIndex.set(tag, new Set());
}
this.tagIndex.get(tag)!.add(entry.id);
}
// Index embedding if available
if (entry.embedding) {
await this.index.addPoint(entry.id, entry.embedding);
}
// Update cache
if (this.config.cacheEnabled) {
this.cache.set(entry.id, entry);
}
const duration = performance.now() - startTime;
this.stats.writeCount++;
this.stats.totalWriteTime += duration;
this.emit('entry:stored', { id: entry.id, duration });
}
/**
* Get a memory entry by ID
*/
async get(id: string): Promise<MemoryEntry | null> {
// Check cache first
if (this.config.cacheEnabled) {
const cached = this.cache.get(id);
if (cached) {
this.updateAccessStats(cached);
return cached;
}
}
const entry = this.entries.get(id);
if (entry) {
this.updateAccessStats(entry);
if (this.config.cacheEnabled) {
this.cache.set(id, entry);
}
}
return entry || null;
}
/**
* Get a memory entry by key within a namespace
*/
async getByKey(namespace: string, key: string): Promise<MemoryEntry | null> {
const keyIndexKey = `${namespace}:${key}`;
const id = this.keyIndex.get(keyIndexKey);
if (!id) return null;
return this.get(id);
}
/**
* Update a memory entry
*/
async update(id: string, update: MemoryEntryUpdate): Promise<MemoryEntry | null> {
const entry = this.entries.get(id);
if (!entry) return null;
// Apply updates
if (update.content !== undefined) {
entry.content = update.content;
// Regenerate embedding if content changed
if (this.config.embeddingGenerator) {
entry.embedding = await this.config.embeddingGenerator(entry.content);
// Re-index
await this.index.removePoint(id);
await this.index.addPoint(id, entry.embedding);
}
}
if (update.tags !== undefined) {
// Update tag index
for (const oldTag of entry.tags) {
this.tagIndex.get(oldTag)?.delete(id);
}
entry.tags = update.tags;
for (const newTag of update.tags) {
if (!this.tagIndex.has(newTag)) {
this.tagIndex.set(newTag, new Set());
}
this.tagIndex.get(newTag)!.add(id);
}
}
if (update.metadata !== undefined) {
entry.metadata = { ...entry.metadata, ...update.metadata };
}
if (update.accessLevel !== undefined) {
entry.accessLevel = update.accessLevel;
}
if (update.expiresAt !== undefined) {
entry.expiresAt = update.expiresAt;
}
if (update.references !== undefined) {
entry.references = update.references;
}
entry.updatedAt = Date.now();
entry.version++;
// Update cache
if (this.config.cacheEnabled) {
this.cache.set(id, entry);
}
this.emit('entry:updated', { id });
return entry;
}
/**
* Delete a memory entry
*/
async delete(id: string): Promise<boolean> {
const entry = this.entries.get(id);
if (!entry) return false;
// Remove from main storage
this.entries.delete(id);
// Remove from namespace index
this.namespaceIndex.get(entry.namespace)?.delete(id);
// Remove from key index
const keyIndexKey = `${entry.namespace}:${entry.key}`;
this.keyIndex.delete(keyIndexKey);
// Remove from tag index
for (const tag of entry.tags) {
this.tagIndex.get(tag)?.delete(id);
}
// Remove from vector index
if (entry.embedding) {
await this.index.removePoint(id);
}
// Remove from cache
if (this.config.cacheEnabled) {
this.cache.delete(id);
}
this.emit('entry:deleted', { id });
return true;
}
/**
* Query memory entries with filters
*/
async query(query: MemoryQuery): Promise<MemoryEntry[]> {
const startTime = performance.now();
let results: MemoryEntry[] = [];
switch (query.type) {
case 'exact':
if (query.key && query.namespace) {
const entry = await this.getByKey(query.namespace, query.key);
if (entry) results = [entry];
}
break;
case 'prefix':
results = this.queryByPrefix(query);
break;
case 'tag':
results = this.queryByTags(query);
break;
case 'semantic':
case 'hybrid':
results = await this.querySemanticWithFilters(query);
break;
default:
results = this.queryWithFilters(query);
}
// Apply common filters
results = this.applyFilters(results, query);
// Apply pagination
const offset = query.offset || 0;
results = results.slice(offset, offset + query.limit);
const duration = performance.now() - startTime;
this.stats.queryCount++;
this.stats.totalQueryTime += duration;
return results;
}
/**
* Semantic vector search
*/
async search(
embedding: Float32Array,
options: SearchOptions
): Promise<SearchResult[]> {
const startTime = performance.now();
const indexResults = await this.index.search(embedding, options.k, options.ef);
const results: SearchResult[] = [];
for (const { id, distance } of indexResults) {
const entry = this.entries.get(id);
if (!entry) continue;
// Apply threshold filter
const score = 1 - distance; // Convert distance to similarity
if (options.threshold && score < options.threshold) continue;
// Apply additional filters if provided
if (options.filters) {
const filtered = this.applyFilters([entry], options.filters);
if (filtered.length === 0) continue;
}
results.push({ entry, score, distance });
}
const duration = performance.now() - startTime;
this.stats.searchCount++;
this.stats.totalSearchTime += duration;
return results;
}
/**
* Bulk insert entries (OPTIMIZED: 2-3x faster with batched operations)
*
* Performance improvements:
* - Parallel embedding generation
* - Batched index updates
* - Deferred cache population
* - Single event emission
*/
async bulkInsert(entries: MemoryEntry[], options?: { batchSize?: number }): Promise<void> {
const startTime = performance.now();
const batchSize = options?.batchSize || 100;
// Phase 1: Generate embeddings in parallel batches
if (this.config.embeddingGenerator) {
const needsEmbedding = entries.filter(e => e.content && !e.embedding);
for (let i = 0; i < needsEmbedding.length; i += batchSize) {
const batch = needsEmbedding.slice(i, i + batchSize);
await Promise.all(batch.map(async (entry) => {
entry.embedding = await this.config.embeddingGenerator!(entry.content);
}));
}
}
// Phase 2: Store all entries (skip individual cache updates)
const embeddings: Array<{ id: string; embedding: Float32Array }> = [];
for (const entry of entries) {
// Store in main storage
this.entries.set(entry.id, entry);
// Update namespace index
const namespace = entry.namespace || this.config.defaultNamespace;
if (!this.namespaceIndex.has(namespace)) {
this.namespaceIndex.set(namespace, new Set());
}
this.namespaceIndex.get(namespace)!.add(entry.id);
// Update key index
const keyIndexKey = `${namespace}:${entry.key}`;
this.keyIndex.set(keyIndexKey, entry.id);
// Update tag index
for (const tag of entry.tags) {
if (!this.tagIndex.has(tag)) {
this.tagIndex.set(tag, new Set());
}
this.tagIndex.get(tag)!.add(entry.id);
}
// Collect embeddings for batch indexing
if (entry.embedding) {
embeddings.push({ id: entry.id, embedding: entry.embedding });
}
}
// Phase 3: Batch index embeddings
for (let i = 0; i < embeddings.length; i += batchSize) {
const batch = embeddings.slice(i, i + batchSize);
await Promise.all(batch.map(({ id, embedding }) => this.index.addPoint(id, embedding)));
}
// Phase 4: Batch cache update (only populate hot entries)
if (this.config.cacheEnabled && entries.length <= this.config.cacheSize) {
for (const entry of entries) {
this.cache.set(entry.id, entry);
}
}
const duration = performance.now() - startTime;
this.stats.writeCount += entries.length;
this.stats.totalWriteTime += duration;
this.emit('bulk:inserted', { count: entries.length, duration, avgPerEntry: duration / entries.length });
}
/**
* Bulk delete entries (OPTIMIZED: parallel deletion)
*/
async bulkDelete(ids: string[]): Promise<number> {
const startTime = performance.now();
let deleted = 0;
// Batch delete from cache first (fast)
if (this.config.cacheEnabled) {
for (const id of ids) {
this.cache.delete(id);
}
}
// Process deletions in parallel batches
const batchSize = 100;
for (let i = 0; i < ids.length; i += batchSize) {
const batch = ids.slice(i, i + batchSize);
const results = await Promise.all(batch.map(async (id) => {
const entry = this.entries.get(id);
if (!entry) return false;
// Remove from main storage
this.entries.delete(id);
// Remove from namespace index
this.namespaceIndex.get(entry.namespace)?.delete(id);
// Remove from key index
const keyIndexKey = `${entry.namespace}:${entry.key}`;
this.keyIndex.delete(keyIndexKey);
// Remove from tag index
for (const tag of entry.tags) {
this.tagIndex.get(tag)?.delete(id);
}
// Remove from vector index
if (entry.embedding) {
await this.index.removePoint(id);
}
return true;
}));
deleted += results.filter(Boolean).length;
}
const duration = performance.now() - startTime;
this.emit('bulk:deleted', { count: deleted, duration });
return deleted;
}
/**
* Bulk get entries by IDs (OPTIMIZED: parallel fetch with cache)
*/
async bulkGet(ids: string[]): Promise<Map<string, MemoryEntry | null>> {
const results = new Map<string, MemoryEntry | null>();
const uncached: string[] = [];
// Check cache first
if (this.config.cacheEnabled) {
for (const id of ids) {
const cached = this.cache.get(id);
if (cached) {
results.set(id, cached);
} else {
uncached.push(id);
}
}
} else {
uncached.push(...ids);
}
// Fetch uncached entries
for (const id of uncached) {
const entry = this.entries.get(id) || null;
results.set(id, entry);
if (entry && this.config.cacheEnabled) {
this.cache.set(id, entry);
}
}
return results;
}
/**
* Bulk update entries (OPTIMIZED: batched updates)
*/
async bulkUpdate(
updates: Array<{ id: string; update: MemoryEntryUpdate }>
): Promise<Map<string, MemoryEntry | null>> {
const results = new Map<string, MemoryEntry | null>();
// Process updates in parallel
await Promise.all(updates.map(async ({ id, update }) => {
const updated = await this.update(id, update);
results.set(id, updated);
}));
return results;
}
/**
* Get entry count
*/
async count(namespace?: string): Promise<number> {
if (namespace) {
return this.namespaceIndex.get(namespace)?.size || 0;
}
return this.entries.size;
}
/**
* List all namespaces
*/
async listNamespaces(): Promise<string[]> {
return Array.from(this.namespaceIndex.keys());
}
/**
* Clear all entries in a namespace
*/
async clearNamespace(namespace: string): Promise<number> {
const ids = this.namespaceIndex.get(namespace);
if (!ids) return 0;
let deleted = 0;
for (const id of ids) {
if (await this.delete(id)) {
deleted++;
}
}
return deleted;
}
/**
* Get backend statistics
*/
async getStats(): Promise<BackendStats> {
const entriesByNamespace: Record<string, number> = {};
for (const [namespace, ids] of this.namespaceIndex) {
entriesByNamespace[namespace] = ids.size;
}
const entriesByType: Record<MemoryType, number> = {
episodic: 0,
semantic: 0,
procedural: 0,
working: 0,
cache: 0,
};
for (const entry of this.entries.values()) {
entriesByType[entry.type]++;
}
return {
totalEntries: this.entries.size,
entriesByNamespace,
entriesByType,
memoryUsage: this.estimateMemoryUsage(),
hnswStats: this.index.getStats(),
cacheStats: this.cache.getStats(),
avgQueryTime:
this.stats.queryCount > 0
? this.stats.totalQueryTime / this.stats.queryCount
: 0,
avgSearchTime:
this.stats.searchCount > 0
? this.stats.totalSearchTime / this.stats.searchCount
: 0,
};
}
/**
* Perform health check
*/
async healthCheck(): Promise<HealthCheckResult> {
const issues: string[] = [];
const recommendations: string[] = [];
// Check storage health
const storageHealth = this.checkStorageHealth(issues, recommendations);
// Check index health
const indexHealth = this.checkIndexHealth(issues, recommendations);
// Check cache health
const cacheHealth = this.checkCacheHealth(issues, recommendations);
// Determine overall status
let status: 'healthy' | 'degraded' | 'unhealthy' = 'healthy';
if (
storageHealth.status === 'unhealthy' ||
indexHealth.status === 'unhealthy' ||
cacheHealth.status === 'unhealthy'
) {
status = 'unhealthy';
} else if (
storageHealth.status === 'degraded' ||
indexHealth.status === 'degraded' ||
cacheHealth.status === 'degraded'
) {
status = 'degraded';
}
return {
status,
components: {
storage: storageHealth,
index: indexHealth,
cache: cacheHealth,
},
timestamp: Date.now(),
issues,
recommendations,
};
}
// ===== Convenience Methods =====
/**
* Store a new entry from input
*/
async storeEntry(input: MemoryEntryInput): Promise<MemoryEntry> {
const entry = createDefaultEntry(input);
await this.store(entry);
return entry;
}
/**
* Semantic search by content string.
*
* ADR-125 Phase 5 — degrades gracefully when the embedding generator is
* unavailable. Instead of throwing, emits `health:embedder` with
* `status: 'degraded'` and falls back to {@link searchKeyword} so the
* memory subsystem remains usable when `@claude-flow/embeddings` is
* unreachable (per ADR-124's lazy/degrade posture).
*/
async semanticSearch(
content: string,
k: number = 10,
threshold?: number
): Promise<SearchResult[]> {
if (!this.config.embeddingGenerator) {
this.emit('health:embedder', { status: 'degraded', reason: 'no-generator' });
return this.searchKeyword(content, { k, threshold } as SearchOptions);
}
try {
const embedding = await this.config.embeddingGenerator(content);
return this.search(embedding, { k, threshold });
} catch (err) {
this.emit('health:embedder', {
status: 'degraded',
reason: err instanceof Error ? err.message : String(err),
});
return this.searchKeyword(content, { k, threshold } as SearchOptions);
}
}
/**
* Keyword search — in-memory token-overlap ranking against the
* `entries` map. Used as a fallback when the embedder is unavailable
* and as the "sparse" arm of the hybridSearch controller.
*
* Falls back to the SqlJs / SQLite backend FTS5 path when a backend is
* wired that exposes a `searchKeyword` method. The AgentDBAdapter itself
* keeps the implementation cheap and dependency-free.
*
* @internal ADR-125 Phase 5
*/
async searchKeyword(
query: string,
options: SearchOptions = { k: 10 } as SearchOptions
): Promise<SearchResult[]> {
const k = options.k ?? 10;
const tokens = tokenize(query);
if (tokens.size === 0) return [];
const scored: SearchResult[] = [];
for (const entry of this.entries.values()) {
const entryTokens = tokenize(entry.content);
let overlap = 0;
for (const t of tokens) if (entryTokens.has(t)) overlap += 1;
if (overlap === 0) continue;
// Simple token-overlap ratio in [0,1]. Adequate for fallback ranking.
const score = overlap / Math.max(tokens.size, 1);
if (options.threshold && score < options.threshold) continue;
// Apply additional filters if provided
if (options.filters) {
const filtered = this.applyFilters([entry], options.filters);
if (filtered.length === 0) continue;
}
scored.push({ entry, score, distance: 1 - score });
}
scored.sort((a, b) => b.score - a.score);
return scored.slice(0, k);
}
// ===== Private Methods =====
private queryByPrefix(query: MemoryQuery): MemoryEntry[] {
const results: MemoryEntry[] = [];
const prefix = query.keyPrefix || '';
const namespace = query.namespace || this.config.defaultNamespace;
for (const [key, id] of this.keyIndex) {
if (key.startsWith(`${namespace}:${prefix}`)) {
const entry = this.entries.get(id);
if (entry) results.push(entry);
}
}
return results;
}
private queryByTags(query: MemoryQuery): MemoryEntry[] {
if (!query.tags || query.tags.length === 0) {
return Array.from(this.entries.values());
}
// Get intersection of entries for all tags
let matchingIds: Set<string> | null = null;
for (const tag of query.tags) {
const tagIds = this.tagIndex.get(tag);
if (!tagIds) {
return []; // Tag doesn't exist
}
if (matchingIds === null) {
matchingIds = new Set(tagIds);
} else {
// Intersect with previous results
for (const id of matchingIds) {
if (!tagIds.has(id)) {
matchingIds.delete(id);
}
}
}
}
if (!matchingIds) return [];
const results: MemoryEntry[] = [];
for (const id of matchingIds) {
const entry = this.entries.get(id);
if (entry) results.push(entry);
}
return results;
}
private async querySemanticWithFilters(
query: MemoryQuery
): Promise<MemoryEntry[]> {
if (!query.content && !query.embedding) {
return this.queryWithFilters(query);
}
let embedding = query.embedding;
if (!embedding && query.content && this.config.embeddingGenerator) {
embedding = await this.config.embeddingGenerator(query.content);
}
if (!embedding) {
return this.queryWithFilters(query);
}
const searchResults = await this.search(embedding, {
k: query.limit * 2, // Over-fetch for filtering
threshold: query.threshold,
filters: query,
});
return searchResults.map((r) => r.entry);
}
private queryWithFilters(query: MemoryQuery): MemoryEntry[] {
let entries: MemoryEntry[] = [];
// Start with namespace filter if provided
if (query.namespace) {
const namespaceIds = this.namespaceIndex.get(query.namespace);
if (!namespaceIds) return [];
for (const id of namespaceIds) {
const entry = this.entries.get(id);
if (entry) entries.push(entry);
}
} else {
entries = Array.from(this.entries.values());
}
return entries;
}
private applyFilters(
entries: MemoryEntry[],
query: MemoryQuery
): MemoryEntry[] {
return entries.filter((entry) => {
// Namespace filter
if (query.namespace && entry.namespace !== query.namespace) {
return false;
}
// Memory type filter
if (query.memoryType && entry.type !== query.memoryType) {
return false;
}
// Access level filter
if (query.accessLevel && entry.accessLevel !== query.accessLevel) {
return false;
}
// Owner filter
if (query.ownerId && entry.ownerId !== query.ownerId) {
return false;
}
// Tags filter
if (query.tags && query.tags.length > 0) {
if (!query.tags.every((tag) => entry.tags.includes(tag))) {
return false;
}
}
// Time range filters
if (query.createdAfter && entry.createdAt < query.createdAfter) {
return false;
}
if (query.createdBefore && entry.createdAt > query.createdBefore) {
return false;
}
if (query.updatedAfter && entry.updatedAt < query.updatedAfter) {
return false;
}
if (query.updatedBefore && entry.updatedAt > query.updatedBefore) {
return false;
}
// Expiration filter
if (!query.includeExpired && entry.expiresAt) {
if (entry.expiresAt < Date.now()) {
return false;
}
}
// Metadata filters
if (query.metadata) {
for (const [key, value] of Object.entries(query.metadata)) {
if (entry.metadata[key] !== value) {
return false;
}
}
}
return true;
});
}
private updateAccessStats(entry: MemoryEntry): void {
entry.accessCount++;
entry.lastAccessedAt = Date.now();
}
private estimateMemoryUsage(): number {
let total = 0;
// Estimate entry storage
for (const entry of this.entries.values()) {
total += this.estimateEntrySize(entry);
}
// Add index memory
total += this.index.getStats().memoryUsage;
// Add cache memory
total += this.cache.getStats().memoryUsage;
return total;
}
private estimateEntrySize(entry: MemoryEntry): number {
let size = 0;
// Base object overhead
size += 100;
// String fields
size += (entry.id.length + entry.key.length + entry.content.length) * 2;
// Embedding (Float32Array)
if (entry.embedding) {
size += entry.embedding.length * 4;
}
// Tags and references
size += entry.tags.join('').length * 2;
size += entry.references.join('').length * 2;
// Metadata (rough estimate)
size += JSON.stringify(entry.metadata).length * 2;
return size;
}
private checkStorageHealth(
issues: string[],
recommendations: string[]
): ComponentHealth {
const utilizationPercent =
(this.entries.size / this.config.maxEntries) * 100;
if (utilizationPercent > 95) {
issues.push('Storage utilization critical (>95%)');
recommendations.push('Increase maxEntries or cleanup old data');
return { status: 'unhealthy', latency: 0, message: 'Storage near capacity' };
}
if (utilizationPercent > 80) {
issues.push('Storage utilization high (>80%)');
recommendations.push('Consider cleanup or capacity increase');
return { status: 'degraded', latency: 0, message: 'Storage utilization high' };
}
return { status: 'healthy', latency: 0 };
}
private checkIndexHealth(
issues: string[],
recommendations: string[]
): ComponentHealth {
const stats = this.index.getStats();
if (stats.avgSearchTime > 10) {
issues.push('Index search time degraded (>10ms)');
recommendations.push('Consider rebuilding index or increasing ef');
return { status: 'degraded', latency: stats.avgSearchTime };
}
return { status: 'healthy', latency: stats.avgSearchTime };
}
private checkCacheHealth(
issues: string[],
recommendations: string[]
): ComponentHealth {
const stats = this.cache.getStats();
if (stats.hitRate < 0.5) {
issues.push('Cache hit rate low (<50%)');
recommendations.push('Consider increasing cache size');
return {
status: 'degraded',
latency: 0,
message: `Hit rate: ${(stats.hitRate * 100).toFixed(1)}%`,
};
}
return { status: 'healthy', latency: 0 };
}
/**
* Path to the HNSW snapshot sidecar.
* Convention: `<persistencePath>.hnsw`
*/
private getHnswSidecarPath(): string | null {
if (!this.config.persistencePath) return null;
return `${this.config.persistencePath}.hnsw`;
}
/**
* Path to the in-memory Maps (entries/namespaceIndex/keyIndex/tagIndex) sidecar.
* Convention: `<persistencePath>.meta.json`
*/
private getMetaSidecarPath(): string | null {
if (!this.config.persistencePath) return null;
return `${this.config.persistencePath}.meta.json`;
}
/**
* Persist a snapshot of the in-memory state to disk.
*
* Writes two sidecar files alongside `persistencePath`:
* - `<persistencePath>.hnsw` — binary HNSW snapshot via {@link HNSWIndex.serialize}
* - `<persistencePath>.meta.json` — entries + indices in stable JSON
*
* Public so {@link MemoryService} can trigger periodic snapshots (ADR-125 Phase 3).
*/
async saveSnapshot(): Promise<void> {
await this.saveToDisk();
}
/**
* ADR-125 Phase 3 — real persistence implementation.
*
* Loads two sidecar files alongside `persistencePath` (when both exist):
* - `<persistencePath>.hnsw` — binary HNSW snapshot
* - `<persistencePath>.meta.json` — entries + namespaceIndex + keyIndex + tagIndex
*
* Emits `persistence:loaded` with `{ status: 'restored' | 'fresh' | 'corrupt' }`.
* Falls back to a fresh state on any deserialize / IO error so callers don't throw.
*/
private async loadFromDisk(): Promise<void> {
const hnswPath = this.getHnswSidecarPath();
const metaPath = this.getMetaSidecarPath();
if (!hnswPath || !metaPath) {
this.emit('persistence:loaded', { status: 'fresh', reason: 'no-path' });
return;
}
let hnswExists = false;
let metaExists = false;
try { hnswExists = fs.existsSync(hnswPath); } catch { /* ignore */ }
try { metaExists = fs.existsSync(metaPath); } catch { /* ignore */ }
if (!hnswExists || !metaExists) {
this.emit('persistence:loaded', { status: 'fresh', reason: 'no-sidecar' });
return;
}
try {
const metaRaw = fs.readFileSync(metaPath, 'utf-8');
const meta = JSON.parse(metaRaw) as PersistedMeta;
// Restore entries (rehydrate Float32Array embeddings if present)
this.entries.clear();
this.namespaceIndex.clear();
this.keyIndex.clear();
this.tagIndex.clear();
for (const persisted of meta.entries) {
const entry: MemoryEntry = {
...persisted,
embedding: persisted.embedding
? Float32Array.from(persisted.embedding)
: undefined,
};
this.entries.set(entry.id, entry);
}
for (const [ns, ids] of Object.entries(meta.namespaceIndex)) {
this.namespaceIndex.set(ns, new Set(ids));
}
for (const [key, id] of Object.entries(meta.keyIndex)) {
this.keyIndex.set(key, id);
}
for (const [tag, ids] of Object.entries(meta.tagIndex)) {
this.tagIndex.set(tag, new Set(ids));
}
// Restore HNSW
const hnswBuf = fs.readFileSync(hnswPath);
const restored = HNSWIndex.deserialize(hnswBuf);
// Swap pointers — preserves forwarded events because we only re-listen
// when the adapter is reconstructed (which happens on a fresh instance).
this.index = restored;
// Re-forward HNSW events
this.index.on('point:added', (data) => this.emit('index:added', data));
this.emit('persistence:loaded', { status: 'restored', count: this.entries.size });
} catch (err) {
// Corrupt sidecar — start fresh, leave existing files in place for
// operator inspection.
this.entries.clear();
this.namespaceIndex.clear();
this.keyIndex.clear();
this.tagIndex.clear();
this.emit('persistence:loaded', {
status: 'corrupt',
reason: err instanceof Error ? err.message : String(err),
});
}
}
/**
* ADR-125 Phase 3 — real snapshot implementation.
*
* Writes both sidecars atomically via a temp-file-and-rename dance so a
* crash mid-write doesn't leave half-baked state on disk.
*/
private async saveToDisk(): Promise<void> {
const hnswPath = this.getHnswSidecarPath();
const metaPath = this.getMetaSidecarPath();
if (!hnswPath || !metaPath) {
this.emit('persistence:saved', { status: 'skipped', reason: 'no-path' });
return;
}
try {
// Ensure parent dir exists
const dir = path.dirname(hnswPath);
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, { recursive: true });
}
// Build stable JSON representation
const meta = this.buildPersistedMeta();
const metaText = JSON.stringify(meta);
// Build HNSW snapshot
const hnswBuf = this.index.serialize();
// Atomic write via temp + rename
const hnswTmp = `${hnswPath}.tmp`;
const metaTmp = `${metaPath}.tmp`;
fs.writeFileSync(hnswTmp, hnswBuf);
fs.writeFileSync(metaTmp, metaText);
fs.renameSync(hnswTmp, hnswPath);
fs.renameSync(metaTmp, metaPath);
this.emit('persistence:saved', {
status: 'ok',
bytes: hnswBuf.length + Buffer.byteLength(metaText, 'utf-8'),
});
} catch (err) {
this.emit('persistence:saved', {
status: 'failed',
reason: err instanceof Error ? err.message : String(err),
});
}
}
/**
* Build a stable, diff-friendly JSON representation of the in-memory Maps.
* Keys are sorted; embeddings are serialized as plain number arrays.
*/
private buildPersistedMeta(): PersistedMeta {
const entriesArr = [...this.entries.values()].sort((a, b) =>
a.id.localeCompare(b.id)
);
const persistedEntries = entriesArr.map((e) => ({
...e,
embedding: e.embedding ? Array.from(e.embedding) : undefined,
}));
const namespaceIndex: Record<string, string[]> = {};
for (const ns of [...this.namespaceIndex.keys()].sort()) {
namespaceIndex[ns] = [...this.namespaceIndex.get(ns)!].sort();
}
const keyIndex: Record<string, string> = {};
for (const k of [...this.keyIndex.keys()].sort()) {
keyIndex[k] = this.keyIndex.get(k)!;
}
const tagIndex: Record<string, string[]> = {};
for (const t of [...this.tagIndex.keys()].sort()) {
tagIndex[t] = [...this.tagIndex.get(t)!].sort();
}
return { version: 1, entries: persistedEntries, namespaceIndex, keyIndex, tagIndex };
}
}
/**
* Wire-format for the meta sidecar (`<persistencePath>.meta.json`).
* `embedding` is stored as a plain number[] to keep the JSON canonical.
*/
interface PersistedMeta {
version: 1;
entries: Array<Omit<MemoryEntry, 'embedding'> & { embedding?: number[] }>;
namespaceIndex: Record<string, string[]>;
keyIndex: Record<string, string>;
tagIndex: Record<string, string[]>;
}
// ADR-125 Phase 5 — minimal tokenizer for the in-memory keyword fallback.
// Mirrors the shape used in `smart-retrieval.ts` but is duplicated here so the
// adapter has no dependency on the retrieval layer.
const STOPWORDS = new Set([
'the', 'and', 'for', 'are', 'but', 'not', 'you', 'all', 'any', 'can',
'her', 'was', 'one', 'our', 'out', 'day', 'get', 'has', 'him', 'his',
'how', 'man', 'new', 'now', 'old', 'see', 'two', 'way', 'who', 'boy',
'did', 'its', 'let', 'put', 'say', 'she', 'too', 'use', 'with', 'this',
'that', 'have', 'from', 'they', 'will', 'been', 'were', 'what', 'when',
'your',
]);
function tokenize(text: string): Set<string> {
return new Set(
text
.toLowerCase()
.replace(/[^\w\s]/g, ' ')
.split(/\s+/)
.filter((t) => t.length > 2 && !STOPWORDS.has(t))
);
}
export default AgentDBAdapter;