v5.1.0

changelog.md

@@ -1,5 +1,25 @@
 # Changelog
 
+## 2026-02-03 - 5.1.0 - feat(localtsmdb)
+export ILocalTsmDbConnectionInfo and expand LocalTsmDb/TsmDB documentation and examples
+
+- Exported new type ILocalTsmDbConnectionInfo from ts_local (ts/index.ts)
+- Added LocalTsmDb configuration example, methods table, and ConnectionInfo interface to README
+- Documented Unix socket vs TCP connection modes and updated usage examples (TCP and socket examples)
+- Expanded TsmDB docs: additional server properties, aggregation stages, regex examples, index operations, database ops, checksums, and wire protocol commands
+- Updated architecture notes to include Unix socket support and new engine components (QueryEngine, UpdateEngine, AggregationEngine)
+
+## 2026-02-03 - 5.0.0 - BREAKING CHANGE(localtsmdb)
+add Unix socket support and change LocalTsmDb API to return connection info instead of a MongoClient
+
+- LocalTsmDb.start() now returns ILocalTsmDbConnectionInfo { socketPath, connectionUri } instead of a connected MongoClient
+- Removed internal MongoClient management: consumers must create/connect/close their own MongoClient using the returned connectionUri (close client before calling db.stop())
+- Added ILocalTsmDbConnectionInfo type and getConnectionInfo() (replaces getClient())
+- TsmdbServer: added socketPath option to listen on Unix sockets, cleans up stale socket files on start/stop, and encodes socket paths in getConnectionUri()
+- LocalTsmDb can auto-generate socket paths in the OS temp dir; LocalTsmDb no longer depends on the mongodb package internally (lightweight Unix socket wrapper)
+- Updated docs and tests to use MongoClient externally and to demonstrate socketPath/connectionUri workflow
+- ts_local plugins no longer export net (net usage moved to server implementation)
+
 ## 2026-02-03 - 4.3.0 - feat(docs)
 add LocalTsmDb documentation and examples; update README code samples and imports; correct examples and variable names; update package author
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartmongo",
-  "version": "4.3.0",
+  "version": "5.1.0",
   "private": false,
   "description": "A module for creating and managing a local MongoDB instance for testing purposes.",
   "exports": {

readme.md

@@ -21,27 +21,33 @@ For reporting bugs, issues, or security vulnerabilities, please visit [community
 | Feature | SmartMongo | TsmDB | LocalTsmDb |
 |---------|------------|-------|------------|
 | **Type** | Real MongoDB (memory server) | Wire protocol server | Zero-config local DB |
-| **Speed** | ~2-5s startup | ⚡ Instant (~5ms) | ⚡ Instant + auto-connect |
+| **Speed** | ~2-5s startup | ⚡ Instant (~5ms) | ⚡ Instant (Unix socket) |
 | **Compatibility** | 100% MongoDB | MongoDB driver compatible | MongoDB driver compatible |
-| **Dependencies** | Downloads MongoDB binary | Zero external deps | Zero external deps |
+| **Dependencies** | Downloads MongoDB binary | Zero external deps | Zero external deps (no MongoDB driver!) |
+| **Connection** | TCP | TCP or Unix socket | Unix socket (default) |
 | **Replication** | ✅ Full replica set | Single node | Single node |
 | **Persistence** | Dump to directory | Memory or file | File-based (automatic) |
 | **Use Case** | Integration testing | Unit testing, CI/CD | Quick prototyping, local dev |
 
 ## 🚀 Quick Start
 
-### Option 1: LocalTsmDb (Zero-Config Local Database) ⭐ NEW
+### Option 1: LocalTsmDb (Zero-Config Local Database) ⭐
 
-The easiest way to get started — just point it at a folder and you have a persistent MongoDB-compatible database with automatic port discovery!
+The easiest way to get started — just point it at a folder and you have a persistent MongoDB-compatible database using Unix sockets. No port conflicts, no MongoDB driver dependency in LocalTsmDb!
 
 ```typescript
 import { LocalTsmDb } from '@push.rocks/smartmongo';
+import { MongoClient } from 'mongodb';
 
 // Create a local database backed by files
 const db = new LocalTsmDb({ folderPath: './my-data' });
 
-// Start and get a connected MongoDB client
-const client = await db.start();
+// Start and get connection info (Unix socket path + connection URI)
+const { connectionUri } = await db.start();
+
+// Connect with your own MongoDB client
+const client = new MongoClient(connectionUri, { directConnection: true });
+await client.connect();
 
 // Use exactly like MongoDB
 const users = client.db('myapp').collection('users');
@@ -51,11 +57,14 @@ const user = await users.findOne({ name: 'Alice' });
 console.log(user); // { _id: ObjectId(...), name: 'Alice', email: 'alice@example.com' }
 
 // Data persists to disk automatically!
+await client.close();
 await db.stop();
 
 // Later... data is still there
 const db2 = new LocalTsmDb({ folderPath: './my-data' });
-const client2 = await db2.start();
+const { connectionUri: uri2 } = await db2.start();
+const client2 = new MongoClient(uri2, { directConnection: true });
+await client2.connect();
 const savedUser = await client2.db('myapp').collection('users').findOne({ name: 'Alice' });
 // savedUser exists!
 ```
@@ -68,7 +77,7 @@ A lightweight, pure TypeScript MongoDB-compatible server — use the official `m
 import { tsmdb } from '@push.rocks/smartmongo';
 import { MongoClient } from 'mongodb';
 
-// Start TsmDB server
+// Start TsmDB server (TCP mode)
 const server = new tsmdb.TsmdbServer({ port: 27017 });
 await server.start();
 
@@ -109,44 +118,91 @@ console.log(descriptor.mongoDbUrl); // mongodb://127.0.0.1:xxxxx/...
 await mongo.stop();
 ```
 
+---
+
 ## 📖 LocalTsmDb API
 
-The simplest option for local development and prototyping — zero config, auto port discovery, and automatic persistence.
+The simplest option for local development and prototyping — lightweight, Unix socket-based, and automatic persistence.
+
+### Configuration
+
+```typescript
+import { LocalTsmDb } from '@push.rocks/smartmongo';
+import type { ILocalTsmDbOptions, ILocalTsmDbConnectionInfo } from '@push.rocks/smartmongo';
+
+const options: ILocalTsmDbOptions = {
+  folderPath: './data',           // Required: where to store data
+  socketPath: '/tmp/my.sock',     // Optional: custom socket path (default: auto-generated)
+};
+
+const db = new LocalTsmDb(options);
+```
+
+### Methods
+
+| Method | Returns | Description |
+|--------|---------|-------------|
+| `start()` | `Promise<ILocalTsmDbConnectionInfo>` | Starts the server and returns connection info |
+| `stop()` | `Promise<void>` | Stops the server and cleans up the socket |
+| `getConnectionInfo()` | `ILocalTsmDbConnectionInfo` | Returns current connection info |
+| `getConnectionUri()` | `string` | Returns the MongoDB connection URI |
+| `getServer()` | `TsmdbServer` | Returns the underlying TsmDB server instance |
+| `running` | `boolean` | Property indicating if the server is running |
+
+### Connection Info
+
+The `start()` method returns an `ILocalTsmDbConnectionInfo` object:
+
+```typescript
+interface ILocalTsmDbConnectionInfo {
+  socketPath: string;      // The Unix socket file path, e.g., /tmp/smartmongo-abc123.sock
+  connectionUri: string;   // MongoDB URI, e.g., mongodb://%2Ftmp%2Fsmartmongo-abc123.sock
+}
+```
 
 ### Basic Usage
 
 ```typescript
 import { LocalTsmDb } from '@push.rocks/smartmongo';
+import { MongoClient } from 'mongodb';
 
-const db = new LocalTsmDb({
-  folderPath: './data',    // Required: where to store data
-  port: 27017,             // Optional: defaults to auto-discovery
-  host: '127.0.0.1',       // Optional: bind address
-});
+const db = new LocalTsmDb({ folderPath: './data' });
 
-// Start and get connected client
-const client = await db.start();
+// Start and get connection info
+const { socketPath, connectionUri } = await db.start();
+console.log(socketPath);    // /tmp/smartmongo-abc123.sock (auto-generated)
+console.log(connectionUri); // mongodb://%2Ftmp%2Fsmartmongo-abc123.sock
 
-// Access the underlying server if needed
-const server = db.getServer();
-const uri = db.getConnectionUri();
+// Connect with your own MongoDB client
+const client = new MongoClient(connectionUri, { directConnection: true });
+await client.connect();
+
+// Use the client
+const users = client.db('mydb').collection('users');
+await users.insertOne({ name: 'Alice' });
 
 // Check status
 console.log(db.running); // true
 
-// Stop when done
+// Stop when done (close your client first!)
+await client.close();
 await db.stop();
 ```
 
 ### Features
 
-- 🔍 **Auto Port Discovery** — Automatically finds an available port if 27017 is in use
+- 🔌 **Unix Sockets** — No port conflicts, faster IPC than TCP
 - 💾 **Automatic Persistence** — Data saved to files, survives restarts
-- 🔌 **Pre-connected Client** — `start()` returns a ready-to-use MongoDB client
+- 🪶 **Lightweight** — No MongoDB driver dependency in LocalTsmDb itself
 - 🎯 **Zero Config** — Just specify a folder path and you're good to go
+- 🔗 **Connection URI** — Ready-to-use URI for your own MongoClient
+
+---
 
 ## 📖 SmartMongo API
 
+Full MongoDB replica set in memory using `mongodb-memory-server`.
+
 ### Creating an Instance
 
 ```typescript
@@ -182,27 +238,44 @@ await mongo.stopAndDumpToDir('./test-data');
 await mongo.stopAndDumpToDir('./test-data', (doc) => `${doc.collection}-${doc._id}.bson`);
 ```
 
+---
+
 ## 🔧 TsmDB API
 
+Pure TypeScript MongoDB wire protocol server. No external dependencies.
+
 ### Server Configuration
 
 ```typescript
 import { tsmdb } from '@push.rocks/smartmongo';
 
+// TCP mode (default)
 const server = new tsmdb.TsmdbServer({
-  port: 27017,           // Default MongoDB port
-  host: '127.0.0.1',     // Bind address
-  storage: 'memory',     // 'memory' or 'file'
-  storagePath: './data', // For file-based storage
+  port: 27017,             // Default MongoDB port
+  host: '127.0.0.1',       // Bind address
+  storage: 'memory',       // 'memory' or 'file'
+  storagePath: './data',   // For file-based storage
+});
+
+// Unix socket mode (no port conflicts!)
+const server = new tsmdb.TsmdbServer({
+  socketPath: '/tmp/my-tsmdb.sock',
+  storage: 'file',
+  storagePath: './data',
 });
 
 await server.start();
-console.log(server.getConnectionUri()); // mongodb://127.0.0.1:27017
+console.log(server.getConnectionUri());
+// TCP: mongodb://127.0.0.1:27017
+// Socket: mongodb://%2Ftmp%2Fmy-tsmdb.sock
 
 // Server properties
 console.log(server.running);              // true
-console.log(server.getUptime());          // seconds
-console.log(server.getConnectionCount()); // active connections
+console.log(server.port);                 // 27017 (TCP mode)
+console.log(server.host);                 // '127.0.0.1' (TCP mode)
+console.log(server.socketPath);           // '/tmp/my-tsmdb.sock' (socket mode)
+console.log(server.getUptime());          // seconds since start
+console.log(server.getConnectionCount()); // active client connections
 
 await server.stop();
 ```
@@ -212,6 +285,7 @@ await server.stop();
 TsmDB supports the core MongoDB operations via the wire protocol:
 
 #### 🔹 CRUD Operations
+
 ```typescript
 // Insert
 await collection.insertOne({ name: 'Bob' });
@@ -241,6 +315,7 @@ const result = await collection.findOneAndUpdate(
 ```
 
 #### 🔹 Query Operators
+
 ```typescript
 // Comparison
 { age: { $eq: 25 } }
@@ -263,9 +338,14 @@ const result = await collection.findOneAndUpdate(
 { tags: { $all: ['mongodb', 'database'] } }
 { scores: { $elemMatch: { $gte: 80, $lt: 90 } } }
 { tags: { $size: 3 } }
+
+// Regex
+{ name: { $regex: /^Al/i } }
+{ email: { $regex: '@example\\.com$' } }
 ```
 
 #### 🔹 Update Operators
+
 ```typescript
 { $set: { name: 'New Name' } }
 { $unset: { tempField: '' } }
@@ -278,9 +358,12 @@ const result = await collection.findOneAndUpdate(
 { $addToSet: { tags: 'unique-tag' } }
 { $pop: { queue: 1 } }  // Remove last
 { $pop: { queue: -1 } } // Remove first
+{ $rename: { oldField: 'newField' } }
+{ $currentDate: { lastModified: true } }
 ```
 
 #### 🔹 Aggregation Pipeline
+
 ```typescript
 const results = await collection.aggregate([
   { $match: { status: 'active' } },
@@ -291,17 +374,28 @@ const results = await collection.aggregate([
 ]).toArray();
 ```
 
-Supported stages: `$match`, `$project`, `$group`, `$sort`, `$limit`, `$skip`, `$unwind`, `$lookup`, `$addFields`, `$count`, `$facet`, and more.
+**Supported stages:** `$match`, `$project`, `$group`, `$sort`, `$limit`, `$skip`, `$unwind`, `$lookup`, `$addFields`, `$count`, `$facet`, `$replaceRoot`, `$set`, `$unset`, and more.
+
+**Supported group accumulators:** `$sum`, `$avg`, `$min`, `$max`, `$first`, `$last`, `$push`, `$addToSet`, `$count`.
 
 #### 🔹 Index Operations
+
 ```typescript
+// Create indexes
 await collection.createIndex({ email: 1 }, { unique: true });
 await collection.createIndex({ name: 1, age: -1 });
+await collection.createIndex({ location: '2dsphere' }); // Geospatial
+
+// List indexes
 const indexes = await collection.listIndexes().toArray();
+
+// Drop indexes
 await collection.dropIndex('email_1');
+await collection.dropIndexes(); // Drop all except _id
 ```
 
 #### 🔹 Database Operations
+
 ```typescript
 // List databases
 const dbs = await client.db().admin().listDatabases();
@@ -315,9 +409,13 @@ await db.dropCollection('oldcollection');
 
 // Drop database
 await db.dropDatabase();
+
+// Database stats
+const stats = await db.stats();
 ```
 
 #### 🔹 Count & Distinct
+
 ```typescript
 // Count documents
 const total = await collection.countDocuments({});
@@ -330,6 +428,7 @@ const activeDepts = await collection.distinct('department', { status: 'active' }
 ```
 
 #### 🔹 Bulk Operations
+
 ```typescript
 const result = await collection.bulkWrite([
   { insertOne: { document: { name: 'Bulk1' } } },
@@ -358,22 +457,22 @@ const server = new tsmdb.TsmdbServer({
   persistIntervalMs: 30000  // Save every 30 seconds
 });
 
-// File-based - persistent storage with optional checksums
-import { tsmdb } from '@push.rocks/smartmongo';
-
+// File-based - persistent storage with checksums
 const server = new tsmdb.TsmdbServer({
   storage: 'file',
   storagePath: './data/tsmdb'
 });
 ```
 
+---
+
 ## ⚡ Performance & Reliability Features
 
 TsmDB includes enterprise-grade features for robustness:
 
 ### 🔍 Index-Accelerated Queries
 
-Indexes are automatically used to accelerate queries. Instead of scanning all documents, TsmDB uses:
+Indexes are automatically used to accelerate queries:
 
 - **Hash indexes** for equality queries (`$eq`, `$in`)
 - **B-tree indexes** for range queries (`$gt`, `$gte`, `$lt`, `$lte`)
@@ -463,22 +562,26 @@ import { tsmdb } from '@push.rocks/smartmongo';
 
 // Checksums are used internally for WAL and data integrity
 // Documents are checksummed on write, verified on read
+const checksum = tsmdb.calculateDocumentChecksum(doc);
+const isValid = tsmdb.verifyChecksum(docWithChecksum);
 ```
 
 ### 📋 Supported Wire Protocol Commands
 
 | Category | Commands |
 |----------|----------|
-| **Handshake** | `hello`, `isMaster` |
+| **Handshake** | `hello`, `isMaster`, `ismaster` |
 | **CRUD** | `find`, `insert`, `update`, `delete`, `findAndModify`, `getMore`, `killCursors` |
 | **Aggregation** | `aggregate`, `count`, `distinct` |
 | **Indexes** | `createIndexes`, `dropIndexes`, `listIndexes` |
 | **Transactions** | `startTransaction`, `commitTransaction`, `abortTransaction` |
-| **Sessions** | `startSession`, `endSessions` |
-| **Admin** | `ping`, `listDatabases`, `listCollections`, `drop`, `dropDatabase`, `create`, `serverStatus`, `buildInfo`, `dbStats`, `collStats` |
+| **Sessions** | `startSession`, `endSessions`, `refreshSessions` |
+| **Admin** | `ping`, `listDatabases`, `listCollections`, `drop`, `dropDatabase`, `create`, `serverStatus`, `buildInfo`, `dbStats`, `collStats`, `connectionStatus` |
 
 TsmDB supports MongoDB wire protocol versions 0-21, compatible with MongoDB 3.6 through 7.0 drivers.
 
+---
+
 ## 🧪 Testing Examples
 
 ### Jest/Mocha with LocalTsmDb
@@ -492,10 +595,13 @@ let client: MongoClient;
 
 beforeAll(async () => {
   db = new LocalTsmDb({ folderPath: './test-data' });
-  client = await db.start();
+  const { connectionUri } = await db.start();
+  client = new MongoClient(connectionUri, { directConnection: true });
+  await client.connect();
 });
 
 afterAll(async () => {
+  await client.close();
   await db.stop();
 });
 
@@ -555,16 +661,19 @@ test('should insert and find user', async () => {
 ```typescript
 import { expect, tap } from '@git.zone/tstest/tapbundle';
 import { LocalTsmDb } from '@push.rocks/smartmongo';
+import { MongoClient } from 'mongodb';
 
 let db: LocalTsmDb;
+let client: MongoClient;
 
 tap.test('setup', async () => {
   db = new LocalTsmDb({ folderPath: './test-data' });
-  await db.start();
+  const { connectionUri } = await db.start();
+  client = new MongoClient(connectionUri, { directConnection: true });
+  await client.connect();
 });
 
 tap.test('should perform CRUD operations', async () => {
-  const client = db.getClient();
   const col = client.db('test').collection('items');
 
   // Create
@@ -587,12 +696,15 @@ tap.test('should perform CRUD operations', async () => {
 });
 
 tap.test('teardown', async () => {
+  await client.close();
   await db.stop();
 });
 
 export default tap.start();
 ```
 
+---
+
 ## 🏗️ Architecture
 
 ### Module Structure
@@ -601,7 +713,7 @@ export default tap.start();
 @push.rocks/smartmongo
 ├── SmartMongo      → Real MongoDB memory server (mongodb-memory-server wrapper)
 ├── tsmdb           → Wire protocol server with full engine stack
-└── LocalTsmDb      → Zero-config local database (convenience wrapper)
+└── LocalTsmDb      → Lightweight Unix socket wrapper (no MongoDB driver dependency)
 ```
 
 ### TsmDB Wire Protocol Stack
@@ -611,7 +723,7 @@ export default tap.start();
 │                   Official MongoDB Driver                    │
 │                      (mongodb npm)                          │
 └─────────────────────────┬───────────────────────────────────┘
-                          │ TCP + OP_MSG/BSON
+                          │ TCP/Unix Socket + OP_MSG/BSON
                           ▼
 ┌─────────────────────────────────────────────────────────────┐
 │                      TsmdbServer                            │
@@ -650,11 +762,16 @@ export default tap.start();
 | **WireProtocol** | Parses MongoDB OP_MSG binary protocol |
 | **CommandRouter** | Routes commands to appropriate handlers |
 | **QueryPlanner** | Analyzes queries and selects execution strategy |
+| **QueryEngine** | Executes queries with filter matching |
+| **UpdateEngine** | Processes update operators (`$set`, `$inc`, etc.) |
+| **AggregationEngine** | Executes aggregation pipelines |
 | **IndexEngine** | Manages B-tree and hash indexes |
 | **SessionEngine** | Tracks client sessions and timeouts |
 | **TransactionEngine** | Handles ACID transaction semantics |
 | **WAL** | Write-ahead logging for durability |
 
+---
+
 ## License and Legal Information
 
 This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the [LICENSE](./LICENSE) file.

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartmongo',
-  version: '4.3.0',
+  version: '5.1.0',
   description: 'A module for creating and managing a local MongoDB instance for testing purposes.'
 }

ts/index.ts

@@ -8,7 +8,7 @@ export * as tsmdb from './ts_tsmdb/index.js';
 
 // Export LocalTsmDb from ts_local
 export { LocalTsmDb } from './ts_local/index.js';
-export type { ILocalTsmDbOptions } from './ts_local/index.js';
+export type { ILocalTsmDbOptions, ILocalTsmDbConnectionInfo } from './ts_local/index.js';
 
 // Export commitinfo
 export { commitinfo };

ts/ts_local/classes.localtsmdb.ts

@@ -1,98 +1,106 @@
 import * as plugins from './plugins.js';
+import * as crypto from 'crypto';
+import * as path from 'path';
+import * as os from 'os';
 import { TsmdbServer } from '../ts_tsmdb/index.js';
-import type { MongoClient } from 'mongodb';
+
+/**
+ * Connection information returned by LocalTsmDb.start()
+ */
+export interface ILocalTsmDbConnectionInfo {
+  /** The Unix socket file path */
+  socketPath: string;
+  /** MongoDB connection URI ready for MongoClient */
+  connectionUri: string;
+}
 
 export interface ILocalTsmDbOptions {
+  /** Required: where to store data */
   folderPath: string;
-  port?: number;
-  host?: string;
+  /** Optional: custom socket path (default: auto-generated in /tmp) */
+  socketPath?: string;
 }
 
 /**
- * LocalTsmDb - Convenience class for local MongoDB-compatible database
+ * LocalTsmDb - Lightweight local MongoDB-compatible database using Unix sockets
  *
  * This class wraps TsmdbServer and provides a simple interface for
- * starting a local file-based MongoDB-compatible server and connecting to it.
+ * starting a local file-based MongoDB-compatible server. Returns connection
+ * info that you can use with your own MongoDB driver instance.
  *
  * @example
  * ```typescript
  * import { LocalTsmDb } from '@push.rocks/smartmongo';
+ * import { MongoClient } from 'mongodb';
  *
  * const db = new LocalTsmDb({ folderPath: './data' });
- * const client = await db.start();
+ * const { connectionUri } = await db.start();
+ *
+ * // Connect with your own MongoDB client
+ * const client = new MongoClient(connectionUri, { directConnection: true });
+ * await client.connect();
  *
  * // Use the MongoDB client
  * const collection = client.db('mydb').collection('users');
  * await collection.insertOne({ name: 'Alice' });
  *
  * // When done
+ * await client.close();
  * await db.stop();
  * ```
  */
 export class LocalTsmDb {
   private options: ILocalTsmDbOptions;
   private server: TsmdbServer | null = null;
-  private client: MongoClient | null = null;
+  private generatedSocketPath: string | null = null;
 
   constructor(options: ILocalTsmDbOptions) {
     this.options = options;
   }
 
   /**
-   * Find an available port starting from the given port
+   * Generate a unique socket path in /tmp
    */
-  private async findAvailablePort(startPort = 27017): Promise<number> {
-    return new Promise((resolve, reject) => {
-      const server = plugins.net.createServer();
-      server.listen(startPort, '127.0.0.1', () => {
-        const addr = server.address();
-        const port = typeof addr === 'object' && addr ? addr.port : startPort;
-        server.close(() => resolve(port));
-      });
-      server.on('error', () => {
-        this.findAvailablePort(startPort + 1).then(resolve).catch(reject);
-      });
-    });
+  private generateSocketPath(): string {
+    const randomId = crypto.randomBytes(8).toString('hex');
+    return path.join(os.tmpdir(), `smartmongo-${randomId}.sock`);
   }
 
   /**
-   * Start the local TsmDB server and return a connected MongoDB client
+   * Start the local TsmDB server and return connection info
    */
-  async start(): Promise<MongoClient> {
-    if (this.server && this.client) {
+  async start(): Promise<ILocalTsmDbConnectionInfo> {
+    if (this.server) {
       throw new Error('LocalTsmDb is already running');
     }
 
-    const port = this.options.port ?? await this.findAvailablePort();
-    const host = this.options.host ?? '127.0.0.1';
+    // Use provided socket path or generate one
+    this.generatedSocketPath = this.options.socketPath ?? this.generateSocketPath();
 
     this.server = new TsmdbServer({
-      port,
-      host,
+      socketPath: this.generatedSocketPath,
       storage: 'file',
       storagePath: this.options.folderPath,
     });
     await this.server.start();
 
-    // Dynamically import mongodb to avoid requiring it as a hard dependency
-    const mongodb = await import('mongodb');
-    this.client = new mongodb.MongoClient(this.server.getConnectionUri(), {
-      directConnection: true,
-      serverSelectionTimeoutMS: 5000,
-    });
-    await this.client.connect();
-
-    return this.client;
+    return {
+      socketPath: this.generatedSocketPath,
+      connectionUri: this.server.getConnectionUri(),
+    };
   }
 
   /**
-   * Get the MongoDB client (throws if not started)
+   * Get connection info (throws if not started)
    */
-  getClient(): MongoClient {
-    if (!this.client) {
+  getConnectionInfo(): ILocalTsmDbConnectionInfo {
+    if (!this.server || !this.generatedSocketPath) {
       throw new Error('LocalTsmDb is not running. Call start() first.');
     }
-    return this.client;
+    return {
+      socketPath: this.generatedSocketPath,
+      connectionUri: this.server.getConnectionUri(),
+    };
   }
 
   /**
@@ -123,16 +131,13 @@ export class LocalTsmDb {
   }
 
   /**
-   * Stop the local TsmDB server and close the client connection
+   * Stop the local TsmDB server
    */
   async stop(): Promise<void> {
-    if (this.client) {
-      await this.client.close();
-      this.client = null;
-    }
     if (this.server) {
       await this.server.stop();
       this.server = null;
+      this.generatedSocketPath = null;
     }
   }
 }

ts/ts_local/index.ts

@@ -1,2 +1,2 @@
 export { LocalTsmDb } from './classes.localtsmdb.js';
-export type { ILocalTsmDbOptions } from './classes.localtsmdb.js';
+export type { ILocalTsmDbOptions, ILocalTsmDbConnectionInfo } from './classes.localtsmdb.js';

ts/ts_local/plugins.ts

@@ -1,4 +1,3 @@
 import * as smartpromise from '@push.rocks/smartpromise';
-import * as net from 'net';
 
-export { smartpromise, net };
+export { smartpromise };

ts/ts_tsmdb/server/TsmdbServer.ts

@@ -1,4 +1,5 @@
 import * as net from 'net';
+import * as fs from 'fs/promises';
 import * as plugins from '../plugins.js';
 import { WireProtocol, OP_QUERY } from './WireProtocol.js';
 import { CommandRouter } from './CommandRouter.js';
@@ -10,10 +11,12 @@ import type { IStorageAdapter } from '../storage/IStorageAdapter.js';
  * Server configuration options
  */
 export interface ITsmdbServerOptions {
-  /** Port to listen on (default: 27017) */
+  /** Port to listen on (default: 27017) - ignored if socketPath is set */
   port?: number;
-  /** Host to bind to (default: 127.0.0.1) */
+  /** Host to bind to (default: 127.0.0.1) - ignored if socketPath is set */
   host?: string;
+  /** Unix socket path - if set, server listens on socket instead of TCP */
+  socketPath?: string;
   /** Storage type: 'memory' or 'file' (default: 'memory') */
   storage?: 'memory' | 'file';
   /** Path for file storage (required if storage is 'file') */
@@ -54,7 +57,7 @@ interface IConnectionState {
  * ```
  */
 export class TsmdbServer {
-  private options: Required<ITsmdbServerOptions>;
+  private options: Required<Omit<ITsmdbServerOptions, 'socketPath'>> & { socketPath: string };
   private server: net.Server | null = null;
   private storage: IStorageAdapter;
   private commandRouter: CommandRouter;
@@ -62,11 +65,14 @@ export class TsmdbServer {
   private connectionIdCounter = 0;
   private isRunning = false;
   private startTime: Date = new Date();
+  private useSocket: boolean;
 
   constructor(options: ITsmdbServerOptions = {}) {
+    this.useSocket = !!options.socketPath;
     this.options = {
       port: options.port ?? 27017,
       host: options.host ?? '127.0.0.1',
+      socketPath: options.socketPath ?? '',
       storage: options.storage ?? 'memory',
       storagePath: options.storagePath ?? './data',
       persistPath: options.persistPath ?? '',
@@ -119,6 +125,18 @@ export class TsmdbServer {
     // Initialize storage
     await this.storage.initialize();
 
+    // Clean up stale socket file if using Unix socket
+    if (this.useSocket && this.options.socketPath) {
+      try {
+        await fs.unlink(this.options.socketPath);
+      } catch (err: any) {
+        // Ignore ENOENT (file doesn't exist)
+        if (err.code !== 'ENOENT') {
+          throw err;
+        }
+      }
+    }
+
     return new Promise((resolve, reject) => {
       this.server = net.createServer((socket) => {
         this.handleConnection(socket);
@@ -132,11 +150,21 @@ export class TsmdbServer {
         }
       });
 
-      this.server.listen(this.options.port, this.options.host, () => {
-        this.isRunning = true;
-        this.startTime = new Date();
-        resolve();
-      });
+      if (this.useSocket && this.options.socketPath) {
+        // Listen on Unix socket
+        this.server.listen(this.options.socketPath, () => {
+          this.isRunning = true;
+          this.startTime = new Date();
+          resolve();
+        });
+      } else {
+        // Listen on TCP
+        this.server.listen(this.options.port, this.options.host, () => {
+          this.isRunning = true;
+          this.startTime = new Date();
+          resolve();
+        });
+      }
     });
   }
 
@@ -161,9 +189,22 @@ export class TsmdbServer {
     await this.storage.close();
 
     return new Promise((resolve) => {
-      this.server!.close(() => {
+      this.server!.close(async () => {
         this.isRunning = false;
         this.server = null;
+
+        // Clean up socket file if using Unix socket
+        if (this.useSocket && this.options.socketPath) {
+          try {
+            await fs.unlink(this.options.socketPath);
+          } catch (err: any) {
+            // Ignore ENOENT (file doesn't exist)
+            if (err.code !== 'ENOENT') {
+              console.error('Failed to remove socket file:', err);
+            }
+          }
+        }
+
         resolve();
       });
     });
@@ -275,9 +316,21 @@ export class TsmdbServer {
    * Get the connection URI for this server
    */
   getConnectionUri(): string {
+    if (this.useSocket && this.options.socketPath) {
+      // URL-encode the socket path (replace / with %2F)
+      const encodedPath = encodeURIComponent(this.options.socketPath);
+      return `mongodb://${encodedPath}`;
+    }
     return `mongodb://${this.options.host}:${this.options.port}`;
   }
 
+  /**
+   * Get the socket path (if using Unix socket mode)
+   */
+  get socketPath(): string | undefined {
+    return this.useSocket ? this.options.socketPath : undefined;
+  }
+
   /**
    * Check if the server is running
    */