Impress Application Server for node.js. All decisions are made. Solutions are scaled and optimized for performance and load.

Metarhia and Impress Application Server way:

• Applied code need to be simple and secure, so we use code sandboxing with v8 isolated contexts, worker threads and minimal trusted npm dependencies;
• Domain code need to be separated from system code; so we use DDE, layered (onion) architecture, DI, SOLID:DIP principle and contract-based approach;
• Impress supports both stateful applications with RPC and client-session sticky to servers; microservices, centralized and distributed architectire;
• No I/O is faster even then async I/O, so we hold state in memory and use lazy I/O for persistent storage;

Features

• Auto API routing, just create endpoint files as an async js lambda function;
• API code live reload with file system watch (when files changes on disk);
• Graceful shutdown and application state recovery after reload;
• Minimum code size and dependencies;
• Can scale on multiple threads and servers;
• Code sandboxing for security, dependency injection and context isolation;
• Utilize multiple CPU cores and serve multiple ports with worker threads;
• Inter-process communication and shared memory used for state management;
• State synchronization mechanism with transactions and subscription;
• Cache server-side executable JavaScript in memory;
• API development support: AJAX RPC and Websocket support;
• Serve static files from memory cache;
• Application configuration (for different named environments);
• Database access layer for PostgreSQL and Relational db schemas;
• Persistent sessions support with authentication, groups and anonymous;
• Multiple protocols: HTTP, HTTPS, WS, WSS;
• Logging with buffering (lazy write) and rotation (keep logs N days);
• File utilities: upload, download, streaming;
• Built-in simple testing framework;
• Server health monitoring;
• Built-in data structures validation and preprocessing library;
• Task scheduling (interval or certain time);
• Request queue with timeout and size;
• Execution timeout and error handling;

Installation, upgrade and start

• Install with npm install impress
• See project structure Metarhia Starter Kit
• Start server with npm run start or node server.js
• To select execution mode (test, dev, prod) use MODE=dev node server.js

Requirements

• Node.js v12.9.0 or later (v14 preferred)
• Linux (tested on Fedora 30, Ubuntu 16, 18, 19 and 20, CentOS 7 and 8)
• Postgresql 9.5 or later (v11.8 preferred)
• OpenSSL v1.1.1 or later (optional, for https & wss)
• certbot (recommended but optional)

Contributors

• Timur Shemsedinov (marcusaurelius)
• See github for full contributors list

License

Copyright (c) 2012-2020 Metarhia contributors. Impress Application Server is MIT licensed. Project coordinator: <[email protected]>