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    Impressive totalitarian style Multipurpose Application Server for node.js. All decisions are made. Solutions are scaled. Tools are provided and optimized for high load. Ready for applied development and production.
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    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 and worker threads;
    • Domain code need to be separated from system code; so we use layered architecture and contract-based approach;
    • Impress supports both stateful applications with RPC and client-session sticky to servers;
    • 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 and upgrade

    Requirements

    • Node.js v12.5.0 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
    • certbot (recommended but optional)

    Contributors

    License

    Copyright (c) 2020 Metarhia contributors. Impress Application Server is MIT licensed. Project coordinator: <timur.shemsedinov@gmail.com>

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