Alex Newman
500 lines
14 KiB
TypeScript
500 lines
14 KiB
TypeScript
/**
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* ChromaSync Service
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*
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* Automatically syncs observations and session summaries to ChromaDB via MCP.
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* This service provides real-time semantic search capabilities by maintaining
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* a vector database synchronized with SQLite.
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*
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* Design: Fail-fast with no fallbacks - if Chroma is unavailable, syncing fails.
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*/
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import { Client } from '@modelcontextprotocol/sdk/client/index.js';
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import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
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import { ParsedObservation, ParsedSummary } from '../../sdk/parser.js';
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import { SessionStore } from '../sqlite/SessionStore.js';
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import { logger } from '../../utils/logger.js';
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import path from 'path';
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import os from 'os';
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interface ChromaDocument {
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id: string;
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document: string;
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metadata: Record<string, string | number>;
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}
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interface StoredObservation {
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id: number;
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sdk_session_id: string;
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project: string;
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text: string | null;
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type: string;
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title: string | null;
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subtitle: string | null;
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facts: string | null; // JSON
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narrative: string | null;
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concepts: string | null; // JSON
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files_read: string | null; // JSON
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files_modified: string | null; // JSON
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prompt_number: number;
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created_at: string;
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created_at_epoch: number;
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}
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interface StoredSummary {
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id: number;
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sdk_session_id: string;
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project: string;
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request: string | null;
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investigated: string | null;
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learned: string | null;
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completed: string | null;
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next_steps: string | null;
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notes: string | null;
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prompt_number: number;
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created_at: string;
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created_at_epoch: number;
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}
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export class ChromaSync {
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private client: Client | null = null;
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private connected: boolean = false;
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private project: string;
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private collectionName: string;
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private readonly VECTOR_DB_DIR: string;
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private readonly BATCH_SIZE = 100;
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constructor(project: string) {
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this.project = project;
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this.collectionName = `cm__${project}`;
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this.VECTOR_DB_DIR = path.join(os.homedir(), '.claude-mem', 'vector-db');
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}
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/**
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* Ensure MCP client is connected to Chroma server
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* Throws error if connection fails
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*/
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private async ensureConnection(): Promise<void> {
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if (this.connected && this.client) {
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return;
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}
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logger.info('CHROMA_SYNC', 'Connecting to Chroma MCP server...', { project: this.project });
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try {
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const transport = new StdioClientTransport({
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command: 'uvx',
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args: [
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'chroma-mcp',
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'--client-type', 'persistent',
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'--data-dir', this.VECTOR_DB_DIR
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]
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});
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this.client = new Client({
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name: 'claude-mem-chroma-sync',
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version: '1.0.0'
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}, {
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capabilities: {}
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});
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await this.client.connect(transport);
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this.connected = true;
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logger.info('CHROMA_SYNC', 'Connected to Chroma MCP server', { project: this.project });
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} catch (error) {
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logger.error('CHROMA_SYNC', 'Failed to connect to Chroma MCP server', { project: this.project }, error as Error);
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throw new Error(`Chroma connection failed: ${error instanceof Error ? error.message : String(error)}`);
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}
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}
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/**
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* Ensure collection exists, create if needed
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* Throws error if collection creation fails
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*/
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private async ensureCollection(): Promise<void> {
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await this.ensureConnection();
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if (!this.client) {
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throw new Error('Chroma client not initialized');
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}
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try {
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// Try to get collection info (will fail if doesn't exist)
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await this.client.callTool({
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name: 'chroma_get_collection_info',
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arguments: {
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collection_name: this.collectionName
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}
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});
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logger.debug('CHROMA_SYNC', 'Collection exists', { collection: this.collectionName });
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} catch (error) {
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// Collection doesn't exist, create it
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logger.info('CHROMA_SYNC', 'Creating collection', { collection: this.collectionName });
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try {
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await this.client.callTool({
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name: 'chroma_create_collection',
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arguments: {
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collection_name: this.collectionName,
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embedding_function_name: 'default'
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}
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});
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logger.info('CHROMA_SYNC', 'Collection created', { collection: this.collectionName });
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} catch (createError) {
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logger.error('CHROMA_SYNC', 'Failed to create collection', { collection: this.collectionName }, createError as Error);
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throw new Error(`Collection creation failed: ${createError instanceof Error ? createError.message : String(createError)}`);
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}
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}
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}
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/**
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* Format observation into Chroma documents (granular approach)
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* Each semantic field becomes a separate vector document
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*/
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private formatObservationDocs(obs: StoredObservation): ChromaDocument[] {
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const documents: ChromaDocument[] = [];
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// Parse JSON fields
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const facts = obs.facts ? JSON.parse(obs.facts) : [];
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const concepts = obs.concepts ? JSON.parse(obs.concepts) : [];
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const files_read = obs.files_read ? JSON.parse(obs.files_read) : [];
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const files_modified = obs.files_modified ? JSON.parse(obs.files_modified) : [];
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const baseMetadata: Record<string, string | number> = {
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sqlite_id: obs.id,
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doc_type: 'observation',
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sdk_session_id: obs.sdk_session_id,
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project: obs.project,
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created_at_epoch: obs.created_at_epoch,
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type: obs.type || 'discovery',
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title: obs.title || 'Untitled'
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};
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// Add optional metadata fields
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if (obs.subtitle) {
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baseMetadata.subtitle = obs.subtitle;
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}
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if (concepts.length > 0) {
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baseMetadata.concepts = concepts.join(',');
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}
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if (files_read.length > 0) {
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baseMetadata.files_read = files_read.join(',');
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}
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if (files_modified.length > 0) {
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baseMetadata.files_modified = files_modified.join(',');
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}
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// Narrative as separate document
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if (obs.narrative) {
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documents.push({
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id: `obs_${obs.id}_narrative`,
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document: obs.narrative,
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metadata: { ...baseMetadata, field_type: 'narrative' }
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});
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}
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// Text as separate document (legacy field)
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if (obs.text) {
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documents.push({
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id: `obs_${obs.id}_text`,
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document: obs.text,
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metadata: { ...baseMetadata, field_type: 'text' }
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});
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}
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// Each fact as separate document
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facts.forEach((fact: string, index: number) => {
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documents.push({
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id: `obs_${obs.id}_fact_${index}`,
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document: fact,
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metadata: { ...baseMetadata, field_type: 'fact', fact_index: index }
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});
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});
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return documents;
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}
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/**
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* Format summary into Chroma documents (granular approach)
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* Each summary field becomes a separate vector document
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*/
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private formatSummaryDocs(summary: StoredSummary): ChromaDocument[] {
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const documents: ChromaDocument[] = [];
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const baseMetadata: Record<string, string | number> = {
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sqlite_id: summary.id,
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doc_type: 'session_summary',
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sdk_session_id: summary.sdk_session_id,
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project: summary.project,
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created_at_epoch: summary.created_at_epoch,
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prompt_number: summary.prompt_number || 0
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};
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// Each field becomes a separate document
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if (summary.request) {
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documents.push({
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id: `summary_${summary.id}_request`,
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document: summary.request,
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metadata: { ...baseMetadata, field_type: 'request' }
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});
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}
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if (summary.investigated) {
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documents.push({
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id: `summary_${summary.id}_investigated`,
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document: summary.investigated,
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metadata: { ...baseMetadata, field_type: 'investigated' }
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});
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}
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if (summary.learned) {
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documents.push({
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id: `summary_${summary.id}_learned`,
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document: summary.learned,
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metadata: { ...baseMetadata, field_type: 'learned' }
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});
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}
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if (summary.completed) {
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documents.push({
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id: `summary_${summary.id}_completed`,
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document: summary.completed,
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metadata: { ...baseMetadata, field_type: 'completed' }
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});
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}
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if (summary.next_steps) {
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documents.push({
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id: `summary_${summary.id}_next_steps`,
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document: summary.next_steps,
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metadata: { ...baseMetadata, field_type: 'next_steps' }
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});
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}
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if (summary.notes) {
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documents.push({
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id: `summary_${summary.id}_notes`,
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document: summary.notes,
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metadata: { ...baseMetadata, field_type: 'notes' }
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});
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}
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return documents;
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}
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/**
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* Add documents to Chroma in batch
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* Throws error if batch add fails
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*/
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private async addDocuments(documents: ChromaDocument[]): Promise<void> {
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if (documents.length === 0) {
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return;
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}
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await this.ensureCollection();
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if (!this.client) {
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throw new Error('Chroma client not initialized');
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}
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try {
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await this.client.callTool({
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name: 'chroma_add_documents',
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arguments: {
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collection_name: this.collectionName,
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documents: documents.map(d => d.document),
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ids: documents.map(d => d.id),
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metadatas: documents.map(d => d.metadata)
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}
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});
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logger.debug('CHROMA_SYNC', 'Documents added', {
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collection: this.collectionName,
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count: documents.length
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});
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} catch (error) {
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logger.error('CHROMA_SYNC', 'Failed to add documents', {
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collection: this.collectionName,
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count: documents.length
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}, error as Error);
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throw new Error(`Document add failed: ${error instanceof Error ? error.message : String(error)}`);
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}
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}
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/**
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* Sync a single observation to Chroma
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* Blocks until sync completes, throws on error
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*/
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async syncObservation(
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observationId: number,
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sdkSessionId: string,
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project: string,
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obs: ParsedObservation,
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promptNumber: number,
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createdAtEpoch: number
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): Promise<void> {
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// Convert ParsedObservation to StoredObservation format
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const stored: StoredObservation = {
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id: observationId,
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sdk_session_id: sdkSessionId,
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project: project,
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text: null, // Legacy field, not used
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type: obs.type,
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title: obs.title,
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subtitle: obs.subtitle,
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facts: JSON.stringify(obs.facts),
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narrative: obs.narrative,
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concepts: JSON.stringify(obs.concepts),
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files_read: JSON.stringify(obs.files_read),
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files_modified: JSON.stringify(obs.files_modified),
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prompt_number: promptNumber,
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created_at: new Date(createdAtEpoch * 1000).toISOString(),
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created_at_epoch: createdAtEpoch
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};
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const documents = this.formatObservationDocs(stored);
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logger.info('CHROMA_SYNC', 'Syncing observation', {
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observationId,
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documentCount: documents.length,
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project
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});
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await this.addDocuments(documents);
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}
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/**
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* Sync a single summary to Chroma
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* Blocks until sync completes, throws on error
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*/
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async syncSummary(
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summaryId: number,
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sdkSessionId: string,
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project: string,
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summary: ParsedSummary,
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promptNumber: number,
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createdAtEpoch: number
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): Promise<void> {
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// Convert ParsedSummary to StoredSummary format
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const stored: StoredSummary = {
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id: summaryId,
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sdk_session_id: sdkSessionId,
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project: project,
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request: summary.request,
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investigated: summary.investigated,
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learned: summary.learned,
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completed: summary.completed,
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next_steps: summary.next_steps,
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notes: summary.notes,
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prompt_number: promptNumber,
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created_at: new Date(createdAtEpoch * 1000).toISOString(),
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created_at_epoch: createdAtEpoch
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};
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const documents = this.formatSummaryDocs(stored);
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logger.info('CHROMA_SYNC', 'Syncing summary', {
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summaryId,
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documentCount: documents.length,
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project
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});
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await this.addDocuments(documents);
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}
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/**
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* Backfill: Sync all observations missing from Chroma
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* Reads from SQLite and syncs in batches
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* Throws error if backfill fails
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*/
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async ensureBackfilled(): Promise<void> {
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logger.info('CHROMA_SYNC', 'Starting backfill', { project: this.project });
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await this.ensureCollection();
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const db = new SessionStore();
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try {
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// Get all observations for this project
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const observations = db.db.prepare(`
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SELECT * FROM observations WHERE project = ? ORDER BY id ASC
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`).all(this.project) as StoredObservation[];
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logger.info('CHROMA_SYNC', 'Backfilling observations', {
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project: this.project,
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count: observations.length
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});
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// Format all observation documents
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const allDocs: ChromaDocument[] = [];
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for (const obs of observations) {
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allDocs.push(...this.formatObservationDocs(obs));
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}
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// Sync in batches
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for (let i = 0; i < allDocs.length; i += this.BATCH_SIZE) {
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const batch = allDocs.slice(i, i + this.BATCH_SIZE);
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await this.addDocuments(batch);
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logger.info('CHROMA_SYNC', 'Backfill progress', {
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project: this.project,
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progress: `${Math.min(i + this.BATCH_SIZE, allDocs.length)}/${allDocs.length}`
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});
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}
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// Get all summaries for this project
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const summaries = db.db.prepare(`
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SELECT * FROM session_summaries WHERE project = ? ORDER BY id ASC
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`).all(this.project) as StoredSummary[];
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logger.info('CHROMA_SYNC', 'Backfilling summaries', {
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project: this.project,
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count: summaries.length
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});
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// Format all summary documents
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const summaryDocs: ChromaDocument[] = [];
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for (const summary of summaries) {
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summaryDocs.push(...this.formatSummaryDocs(summary));
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}
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// Sync in batches
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for (let i = 0; i < summaryDocs.length; i += this.BATCH_SIZE) {
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const batch = summaryDocs.slice(i, i + this.BATCH_SIZE);
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await this.addDocuments(batch);
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logger.info('CHROMA_SYNC', 'Backfill progress', {
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project: this.project,
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progress: `${Math.min(i + this.BATCH_SIZE, summaryDocs.length)}/${summaryDocs.length}`
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});
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}
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logger.info('CHROMA_SYNC', 'Backfill complete', {
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project: this.project,
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observationDocs: allDocs.length,
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summaryDocs: summaryDocs.length
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});
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} catch (error) {
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logger.error('CHROMA_SYNC', 'Backfill failed', { project: this.project }, error as Error);
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throw new Error(`Backfill failed: ${error instanceof Error ? error.message : String(error)}`);
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} finally {
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db.close();
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}
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}
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/**
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* Close the Chroma client connection
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*/
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async close(): Promise<void> {
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if (this.client && this.connected) {
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await this.client.close();
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this.connected = false;
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this.client = null;
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logger.info('CHROMA_SYNC', 'Chroma client closed', { project: this.project });
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}
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}
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}
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