Code improvements and addad test #3
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- Updated `.gitignore` to include additional files and directories for better project management. - Refactored `package.json` to move the main server file to `src/`, added Jest for testing, and integrated Husky for pre-commit checks. - Expanded `CHANGELOG.md` with new project features and improvements. - Updated `README.md` to include setup instructions, available tools, and contribution guidelines. - Removed `mcp-sqlite-server.js` as it has been relocated to the `src/` directory.
- Added an ignore pattern for test files in `lint-staged` configuration within `package.json`. - Removed unnecessary lines from the pre-commit hook script in `.husky/pre-commit` to streamline the process.
Summary of ChangesHello @spazyCZ, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the developer experience and reliability of the MCP SQLite Server. It introduces a robust testing infrastructure, integrates code quality tools, and refines the server's core logic to provide more structured and informative responses, particularly for AI agent interactions. The changes aim to streamline development, improve maintainability, and ensure the stability of the server's operations. Highlights
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Pull Request Overview
This pull request adds comprehensive test coverage and improves code organization for the MCP SQLite Server. The changes focus on scaffolding test descriptions for AI agent understanding, performing code optimizations to improve performance and readability, and adding extensive tests to ensure reliability and coverage.
- Restructured project with proper source directory organization (
src/folder) - Added comprehensive Jest test suite with multiple test categories (unit, integration, performance, error handling)
- Enhanced tool descriptions with detailed documentation, parameter explanations, and performance tips
Reviewed Changes
Copilot reviewed 28 out of 32 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| src/mcp-sqlite-server.js | Main server implementation moved to src/ with enhanced tool descriptions and structured error responses |
| test/ | Complete test suite including unit tests, integration tests, performance benchmarks, and error handling tests |
| package.json | Updated scripts, dependencies, and project structure configuration |
| Configuration files | Added ESLint, Prettier, Husky, and GitHub workflows for code quality and CI/CD |
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test/visual-comparison.js
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| console.log(''); | ||
| console.log('The "negative improvement" (-356%) is misleading because:'); | ||
| console.log(''); | ||
| console.log("1. 📈 We're measuring raw parsing speed, not value"); |
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Corrected spelling of 'addad' to 'added' in the PR title.
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| // Add a database info tool for debugging | ||
| server.tool( | ||
| 'db_info', | ||
| 'Get comprehensive information about the SQLite database including path, existence, size, last modified time, and table count. Useful for debugging and monitoring database status. Returns metadata without executing queries against user tables, making it fast and safe for frequent calls.', |
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[nitpick] The tool description is very detailed and helpful for AI agents, providing clear context about the tool's purpose, performance characteristics, and safety guarantees.
| 'Get comprehensive information about the SQLite database including path, existence, size, last modified time, and table count. Useful for debugging and monitoring database status. Returns metadata without executing queries against user tables, making it fast and safe for frequent calls.', | |
| 'Get basic information about the SQLite database for debugging and monitoring.', |
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.github/workflows/ci.yml
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| run: npm ci | ||
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| - name: Run linting | ||
| run: npx eslint mcp-sqlite-server.js |
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The CI workflow is linting the old file path. It should lint src/mcp-sqlite-server.js instead since the file was moved.
| run: npx eslint mcp-sqlite-server.js | |
| run: npx eslint src/mcp-sqlite-server.js |
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.github/workflows/ci.yml
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| run: node -c mcp-sqlite-server.js | ||
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| - name: Test MCP server startup | ||
| run: 'timeout 10s node mcp-sqlite-server.js :memory: || true' |
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The CI workflow references the old file path. Should be src/mcp-sqlite-server.js to match the new project structure.
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![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
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Code Review
This pull request introduces a significant number of improvements to the project, including a major refactoring of the server logic, the addition of comprehensive testing and project configuration files (ESLint, Prettier, Jest, Husky), and enhanced documentation. The new server implementation with structured responses, detailed tool descriptions, and robust error handling is a fantastic step forward.
My review focuses on a few key areas to ensure these new additions work together correctly:
- Testing Correctness: The new Jest tests are not currently testing the new server logic. I've left critical comments on how to fix this by exporting the
SQLiteHandlerclass and updating the test files to import it. - Configuration Consistency: There are conflicting ESLint configuration files that should be consolidated.
- Code Cleanup: A minor cleanup in the
.gitignorefile is suggested to remove duplicate entries.
Once these points are addressed, this will be an excellent merge that greatly improves the developer experience and reliability of the project.
src/mcp-sqlite-server.js
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| await server.connect(transport); | ||
| } | ||
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| main(); |
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The main() function is called directly, which prevents this file from being imported for testing without executing the server logic. To make the SQLiteHandler class and other components testable, it's a best practice to only run main() when the script is executed directly. This will allow your new Jest tests to import and test the actual implementation.
| main(); | |
| if (require.main === module) { | |
| main(); | |
| } | |
| module.exports = { SQLiteHandler }; |
test/error-handling.test.js
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| class SQLiteHandler { | ||
| constructor(dbPath) { | ||
| this.dbPath = dbPath; | ||
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| this.db = new sqlite3.Database(dbPath, err => { | ||
| if (err) { | ||
| console.error(`Error opening database: ${err.message}`); | ||
| } | ||
| }); | ||
| } | ||
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| async executeQuery(sql, values = []) { | ||
| return new Promise((resolve, reject) => { | ||
| this.db.all(sql, values, (err, rows) => { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve(rows); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| async executeRun(sql, values = []) { | ||
| return new Promise((resolve, reject) => { | ||
| this.db.run(sql, values, function (err) { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve({ | ||
| lastID: this.lastID, | ||
| changes: this.changes, | ||
| }); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| async listTables() { | ||
| return this.executeQuery( | ||
| "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | ||
| ); | ||
| } | ||
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| async getTableSchema(tableName) { | ||
| return this.executeQuery(`PRAGMA table_info(${tableName})`); | ||
| } | ||
| } | ||
|
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This test suite re-defines the SQLiteHandler class locally. This appears to be an outdated version, which means the new implementation in src/mcp-sqlite-server.js is not being tested. After exporting SQLiteHandler from the main server file (as suggested in another comment), you should import it here to ensure you are testing the correct code.
const { SQLiteHandler } = require('../src/mcp-sqlite-server');
test/mcp-tools.test.js
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| // Import the SQLiteHandler class (we'll need to extract it from the main file) | ||
| const sqlite3 = require('sqlite3').verbose(); | ||
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| class SQLiteHandler { | ||
| constructor(dbPath) { | ||
| this.dbPath = dbPath; | ||
| this.isValid = true; | ||
| this.db = null; | ||
| this.initError = null; | ||
| this.initPromise = null; | ||
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| // Create database connection and handle initialization asynchronously | ||
| this.initPromise = new Promise((resolve, reject) => { | ||
| try { | ||
| this.db = new sqlite3.Database(dbPath, err => { | ||
| if (err) { | ||
| this.initError = err; | ||
| this.isValid = false; | ||
| reject(err); | ||
| } else { | ||
| this.isValid = true; | ||
| resolve(); | ||
| } | ||
| }); | ||
| } catch (err) { | ||
| this.initError = err; | ||
| this.isValid = false; | ||
| reject(err); | ||
| } | ||
| }); | ||
| } | ||
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| // Helper method to check if database is valid | ||
| async checkDatabase() { | ||
| try { | ||
| // Wait for initialization to complete | ||
| await this.initPromise; | ||
| } catch (err) { | ||
| // Initialization failed, this is expected for invalid paths | ||
| throw new Error(`Database not accessible: ${err.message}`); | ||
| } | ||
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| if (!this.isValid || !this.db) { | ||
| throw new Error('Database connection not established'); | ||
| } | ||
| } | ||
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| async executeQuery(sql, values = []) { | ||
| await this.checkDatabase(); | ||
| return new Promise((resolve, reject) => { | ||
| this.db.all(sql, values, (err, rows) => { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve(rows); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| async executeRun(sql, values = []) { | ||
| await this.checkDatabase(); | ||
| return new Promise((resolve, reject) => { | ||
| this.db.run(sql, values, function (err) { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve({ | ||
| lastID: this.lastID, | ||
| changes: this.changes, | ||
| }); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| async listTables() { | ||
| return this.executeQuery( | ||
| "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | ||
| ); | ||
| } | ||
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| async getTableSchema(tableName) { | ||
| return this.executeQuery(`PRAGMA table_info(${tableName})`); | ||
| } | ||
| } |
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This test suite re-defines the SQLiteHandler class locally, and the comment on line 8 even notes that it needs to be extracted. This version is outdated, and the new implementation in src/mcp-sqlite-server.js is not being tested. After exporting SQLiteHandler from the main server file, you should import it here to ensure you are testing the correct code.
| // Import the SQLiteHandler class (we'll need to extract it from the main file) | |
| const sqlite3 = require('sqlite3').verbose(); | |
| class SQLiteHandler { | |
| constructor(dbPath) { | |
| this.dbPath = dbPath; | |
| this.isValid = true; | |
| this.db = null; | |
| this.initError = null; | |
| this.initPromise = null; | |
| // Create database connection and handle initialization asynchronously | |
| this.initPromise = new Promise((resolve, reject) => { | |
| try { | |
| this.db = new sqlite3.Database(dbPath, err => { | |
| if (err) { | |
| this.initError = err; | |
| this.isValid = false; | |
| reject(err); | |
| } else { | |
| this.isValid = true; | |
| resolve(); | |
| } | |
| }); | |
| } catch (err) { | |
| this.initError = err; | |
| this.isValid = false; | |
| reject(err); | |
| } | |
| }); | |
| } | |
| // Helper method to check if database is valid | |
| async checkDatabase() { | |
| try { | |
| // Wait for initialization to complete | |
| await this.initPromise; | |
| } catch (err) { | |
| // Initialization failed, this is expected for invalid paths | |
| throw new Error(`Database not accessible: ${err.message}`); | |
| } | |
| if (!this.isValid || !this.db) { | |
| throw new Error('Database connection not established'); | |
| } | |
| } | |
| async executeQuery(sql, values = []) { | |
| await this.checkDatabase(); | |
| return new Promise((resolve, reject) => { | |
| this.db.all(sql, values, (err, rows) => { | |
| if (err) { | |
| reject(err); | |
| } else { | |
| resolve(rows); | |
| } | |
| }); | |
| }); | |
| } | |
| async executeRun(sql, values = []) { | |
| await this.checkDatabase(); | |
| return new Promise((resolve, reject) => { | |
| this.db.run(sql, values, function (err) { | |
| if (err) { | |
| reject(err); | |
| } else { | |
| resolve({ | |
| lastID: this.lastID, | |
| changes: this.changes, | |
| }); | |
| } | |
| }); | |
| }); | |
| } | |
| async listTables() { | |
| return this.executeQuery( | |
| "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | |
| ); | |
| } | |
| async getTableSchema(tableName) { | |
| return this.executeQuery(`PRAGMA table_info(${tableName})`); | |
| } | |
| } | |
| const { SQLiteHandler } = require('../src/mcp-sqlite-server'); |
test/sqlite-handler.test.js
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| const sqlite3 = require('sqlite3').verbose(); | ||
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| class SQLiteHandler { | ||
| constructor(dbPath) { | ||
| this.dbPath = dbPath; | ||
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| // Open the database without logging | ||
| this.db = new sqlite3.Database(dbPath, err => { | ||
| if (err) { | ||
| console.error(`Error opening database: ${err.message}`); | ||
| } | ||
| }); | ||
| } | ||
|
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| async executeQuery(sql, values = []) { | ||
| return new Promise((resolve, reject) => { | ||
| this.db.all(sql, values, (err, rows) => { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve(rows); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
|
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| async executeRun(sql, values = []) { | ||
| return new Promise((resolve, reject) => { | ||
| this.db.run(sql, values, function (err) { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve({ | ||
| lastID: this.lastID, | ||
| changes: this.changes, | ||
| }); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
|
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| async listTables() { | ||
| return this.executeQuery( | ||
| "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | ||
| ); | ||
| } | ||
|
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| async getTableSchema(tableName) { | ||
| return this.executeQuery(`PRAGMA table_info(${tableName})`); | ||
| } | ||
| } |
There was a problem hiding this comment.
This test suite re-defines the SQLiteHandler class locally. This appears to be an outdated version, which means the new implementation in src/mcp-sqlite-server.js is not being tested. After exporting SQLiteHandler from the main server file (as suggested in another comment), you should import it here to ensure you are testing the correct code.
| const sqlite3 = require('sqlite3').verbose(); | |
| class SQLiteHandler { | |
| constructor(dbPath) { | |
| this.dbPath = dbPath; | |
| // Open the database without logging | |
| this.db = new sqlite3.Database(dbPath, err => { | |
| if (err) { | |
| console.error(`Error opening database: ${err.message}`); | |
| } | |
| }); | |
| } | |
| async executeQuery(sql, values = []) { | |
| return new Promise((resolve, reject) => { | |
| this.db.all(sql, values, (err, rows) => { | |
| if (err) { | |
| reject(err); | |
| } else { | |
| resolve(rows); | |
| } | |
| }); | |
| }); | |
| } | |
| async executeRun(sql, values = []) { | |
| return new Promise((resolve, reject) => { | |
| this.db.run(sql, values, function (err) { | |
| if (err) { | |
| reject(err); | |
| } else { | |
| resolve({ | |
| lastID: this.lastID, | |
| changes: this.changes, | |
| }); | |
| } | |
| }); | |
| }); | |
| } | |
| async listTables() { | |
| return this.executeQuery( | |
| "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | |
| ); | |
| } | |
| async getTableSchema(tableName) { | |
| return this.executeQuery(`PRAGMA table_info(${tableName})`); | |
| } | |
| } | |
| const { SQLiteHandler } = require('../src/mcp-sqlite-server'); |
.eslintrc.js
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| module.exports = { | ||
| env: { | ||
| node: true, | ||
| es6: true, | ||
| }, | ||
| extends: 'eslint:recommended', | ||
| parserOptions: { | ||
| ecmaVersion: 2020, | ||
| sourceType: 'commonjs', | ||
| }, | ||
| rules: { | ||
| 'no-console': 'off', // Allow console statements for server logging | ||
| 'no-unused-vars': 'warn', | ||
| 'no-undef': 'error', | ||
| semi: ['error', 'always'], | ||
| quotes: 'off', // Handled by Prettier | ||
| indent: 'off', // Handled by Prettier | ||
| }, | ||
| overrides: [ | ||
| { | ||
| files: ['test/**/*.js'], | ||
| env: { | ||
| node: true, | ||
| es6: true, | ||
| jest: true, | ||
| }, | ||
| rules: { | ||
| 'no-console': 'off', | ||
| 'no-unused-vars': 'warn', | ||
| }, | ||
| }, | ||
| ], | ||
| }; |
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This pull request adds a modern eslint.config.js file, which is the new standard for ESLint configuration. However, this legacy .eslintrc.js file was also added. Having both can cause conflicts and confusion. It's best to consolidate all ESLint rules into eslint.config.js and remove this file.
.gitignore
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| # Runtime data | ||
| pids | ||
| *.pid | ||
| *.seed | ||
| *.pid.lock | ||
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| # Directory for instrumented libs generated by jscoverage/JSCover | ||
| lib-cov | ||
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| # Coverage directory used by tools like istanbul | ||
| coverage | ||
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| # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) | ||
| .grunt | ||
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| # Compiled binary addons (http://nodejs.org/api/addons.html) | ||
| build/Release | ||
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| # Users Environment Variables | ||
| .lock-wscript |
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This section contains several entries that are duplicates of entries appearing earlier in the file. For example:
- The "Runtime data" block (lines 93-97) is a repeat of lines 7-11.
coverage(line 103) is a repeat of line 14..grunt(line 106) is a repeat of line 21.build/Release(line 109) is a repeat of line 30..lock-wscript(line 112) is a repeat of line 27.
To keep the .gitignore file clean and maintainable, these redundant lines should be removed.
package.json
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| "ignore": [ | ||
| "test/**" | ||
| ], |
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The lint-staged configuration ignores the test/** directory. While this is sometimes intentional, the newly added test files contain a significant amount of code, including helper classes and simulation logic, that would benefit from being linted and formatted to maintain code quality and consistency across the entire codebase.
"ignore": [],- Deleted `.eslintrc.js` as it is no longer needed. - Updated `.gitignore` to remove obsolete entries for better clarity. - Adjusted `lint-staged` configuration in `package.json` to include test files for linting. - Refactored SQL query strings in `mcp-sqlite-server.js` and tests for consistency. - Improved error handling in the SQLite handler and tests.
- Changed ESLint configuration to target only JavaScript files in the `src` directory. - Removed obsolete test file configurations from ESLint settings. - Simplified `lint-staged` command in `package.json` by removing the explicit config reference.
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Pull Request Overview
Copilot reviewed 28 out of 32 changed files in this pull request and generated 5 comments.
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| @@ -0,0 +1,127 @@ | |||
| #!/usr/bin/env node | |||
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Corrected spelling of 'addad' to 'added' in PR title.
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src/mcp-sqlite-server.js
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| const dbExists = existsSync(absoluteDbPath); | ||
| let fileSize = 0; | ||
| let fileStats = null; | ||
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| if (dbExists) { | ||
| fileStats = statSync(absoluteDbPath); | ||
| fileSize = fileStats.size; | ||
| } | ||
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| // Get table count - handle case where database is not accessible | ||
| let tableCount = 0; | ||
| try { | ||
| const tableCountResult = await handler.executeQuery( | ||
| "SELECT count(*) as count FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'" | ||
| ); | ||
| tableCount = tableCountResult[0].count; | ||
| } catch { | ||
| // Database is not accessible, table count remains 0 | ||
| tableCount = 0; | ||
| } |
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[nitpick] Consider extracting database info gathering logic into a separate method to improve readability and reusability.
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test/test-utils.js
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| const originalError = console.error; | ||
| console.error = jest.fn(); | ||
| return () => { | ||
| console.error = originalError; |
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Consider using jest.spyOn() instead of directly overriding console.error for better test isolation and automatic cleanup.
| const originalError = console.error; | |
| console.error = jest.fn(); | |
| return () => { | |
| console.error = originalError; | |
| const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {}); | |
| return () => { | |
| errorSpy.mockRestore(); |
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test/client-simulation-test.js
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| const timeout = setTimeout(() => { | ||
| reject(new Error('Request timeout')); | ||
| }, 5000); |
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Magic number 5000 should be extracted as a constant (e.g., REQUEST_TIMEOUT_MS) for better maintainability.
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| const placeholders = columns.map(() => '?').join(', '); | ||
| const values = Object.values(data); | ||
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| const sql = `INSERT INTO ${table} (${columns.join(', ')}) VALUES (${placeholders})`; |
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Table name is not parameterized and could be vulnerable to SQL injection. Consider validating table names against existing tables or using a whitelist approach.
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…trieval - Added isValidTableName method to validate table names against SQL injection. - Implemented getDatabaseInfo method to retrieve database existence, size, last modified date, and table count. - Updated listTables and getTableSchema methods to include validation. - Refactored main function to utilize getDatabaseInfo for improved database handling. - Adjusted tool descriptions for clarity and consistency in error handling.
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Pull Request Overview
Copilot reviewed 28 out of 32 changed files in this pull request and generated 3 comments.
Comments suppressed due to low confidence (1)
test/mcp-tools.test.js:1
- The condition checks for both 'success' and 'timestamp' fields but doesn't validate their types or values. Consider using a more robust validation that checks if these fields contain expected data types (boolean for success, ISO string for timestamp).
const { TestDatabase, createTestDbPath, mockConsoleError } = require('./test-utils');
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src/mcp-sqlite-server.js
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| // Register SQLite query tool | ||
| server.tool( | ||
| 'query', | ||
| "Execute raw SQL queries against the database with optional parameterized values for security. Supports SELECT, INSERT, UPDATE, DELETE, and DDL operations. Use parameterized queries (with 'values' array) to prevent SQL injection. For better performance: use LIMIT clauses for large result sets, create indexes for frequently queried columns, and avoid SELECT * when possible. Returns query results as JSON array.", |
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The tool description mentions 'Returns query results as JSON array' but the actual implementation returns a structured JSON object with success, data, rowCount, and timestamp fields. The description should be updated to accurately reflect the structured response format.
| "Execute raw SQL queries against the database with optional parameterized values for security. Supports SELECT, INSERT, UPDATE, DELETE, and DDL operations. Use parameterized queries (with 'values' array) to prevent SQL injection. For better performance: use LIMIT clauses for large result sets, create indexes for frequently queried columns, and avoid SELECT * when possible. Returns query results as JSON array.", | |
| "Execute raw SQL queries against the database with optional parameterized values for security. Supports SELECT, INSERT, UPDATE, DELETE, and DDL operations. Use parameterized queries (with 'values' array) to prevent SQL injection. For better performance: use LIMIT clauses for large result sets, create indexes for frequently queried columns, and avoid SELECT * when possible. Returns a structured JSON object with fields: success, data (array of results), rowCount, and timestamp.", |
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src/mcp-sqlite-server.js
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| if (!handler.isValidTableName(table)) { | ||
| throw new Error(`Invalid table name: ${table}`); |
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Table name validation is performed in multiple places but the validation logic is only in the handler class. Consider extracting this validation to a shared utility function or consistently using the handler method to avoid potential SQL injection if validation is missed elsewhere.
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| const duration = endTime - startTime; | ||
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| // Should complete within reasonable time (adjust threshold as needed) | ||
| expect(duration).toBeLessThan(5000); // 5 seconds |
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[nitpick] The performance test timeout of 5 seconds for 1000 database operations may be too lenient and could mask performance regressions. Consider using a more restrictive threshold based on typical performance benchmarks.
| expect(duration).toBeLessThan(5000); // 5 seconds | |
| expect(duration).toBeLessThan(2000); // 2 seconds |
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…riptions - Moved table name validation logic to a standalone function, isValidTableName, to enhance code clarity and reusability. - Updated getTableSchema and other methods to utilize the new validation function. - Refined descriptions for server tools to improve clarity and consistency in documentation.
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Pull Request Overview
Copilot reviewed 28 out of 32 changed files in this pull request and generated 4 comments.
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| @@ -0,0 +1,127 @@ | |||
| #!/usr/bin/env node | |||
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Fixed typo in file header
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| * Performance Testing Suite for MCP SQLite Server | ||
| * Tests the improvements in descriptions and response formatting | ||
| */ |
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Corrected spelling of 'receive' in PR title
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…ywords - Added a set of SQLite reserved keywords to prevent their use as table names in the isValidTableName function. - Updated the function to check against these keywords, ensuring better security against SQL injection. - Added tests to verify that reserved keywords are correctly rejected as valid table names.
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Scaffolded tool descriptions for AI agent undestanding
Performed code optimizations to improve performance and readability.
Added tests to ensure reliability and coverage.
Included common project files and configurations.
Feel free to adjust or add specific files/changes! Let me know if you want this description formatted directly into your PR.