Method constructor

src/network.js:45–70

(options = {})

class NetworkStack extends EventEmitter {
    constructor(options = {}) {
        super();
        this.gatewayIP = options.gatewayIP || '192.168.127.1';
        this.vmIP = options.vmIP || '192.168.127.3';
        this.gatewayMac = options.gatewayMac || Buffer.from([0x5a, 0x94, 0xef, 0xe4, 0x0c, 0xdd]);
        this.vmMac = Buffer.from([0x02, 0x00, 0x00, 0x00, 0x00, 0x01]); // Default VM MAC
        
        this.natTable = new Map(); // key -> { state, mySeq, myAck, ... } for TCP state tracking
        
        // Network I/O via shared ring buffer for INCOMING data (main → worker)
        // No more MessagePort polling for data!
        this.ringReader = options.ringReader || null;
        
        // MessagePort still needed for OUTGOING control messages (worker → main)
        this.netPort = options.netPort || null;
        
        // QEMU Framing Buffer
        this.txBuffer = Buffer.alloc(0); // Data sending TO the VM (queued)
        this.rxBuffer = Buffer.alloc(0); // Data received FROM the VM (buffering for full frame)
        
        // TCP Flow Control: Maximum buffer before requesting pause
        // Use larger buffers to reduce pause/resume cycle frequency and improve throughput
        this.TX_BUFFER_HIGH_WATER = 256 * 1024;  // 256KB - request pause
        this.TX_BUFFER_LOW_WATER = 64 * 1024;    // 64KB - request resume
        this.txPaused = new Set(); // Set of TCP session keys that are paused
    }
    
    /**
     * Check if there's network data available in the ring buffer