Lesson 45-WinterJS Source Code Architecture

WinterJS Core Module Source Code

V8 Engine Integration and Optimization

Rust and V8 Interaction Implementation

// src/v8_integration.rs
use v8::{Isolate, Context, Script};

pub struct V8Runtime {
    isolate: Isolate,
    context: Context,
}

impl V8Runtime {
    pub fn new() -> Self {
        // Create V8 isolate instance
        let isolate = Isolate::new(Default::default());

        // Create execution context
        let context = Context::new(&isolate);

        V8Runtime { isolate, context }
    }

    pub fn execute_script(&mut self, code: &str) -> Result<String, String> {
        // Enter V8 context
        let scope = &mut v8::HandleScope::new(&self.isolate);
        let context = self.context.enter(scope);

        // Compile script
        let script = match v8::Script::compile(context, code) {
            Some(s) => s,
            None => return Err("Script compilation failed".into()),
        };

        // Execute script
        let result = match script.run(context) {
            Some(r) => r,
            None => return Err("Script execution failed".into()),
        };

        // Convert result to string
        let result_str = match result.to_string(context) {
            Some(s) => s.to_rust_string_lossy(scope),
            None => return Err("Result conversion failed".into()),
        };

        Ok(result_str)
    }
}

// V8 optimization strategy implementation
pub struct V8Optimizer {
    warmup_scripts: Vec<String>,
}

impl V8Optimizer {
    pub fn new() -> Self {
        V8Optimizer {
            warmup_scripts: vec![
                "function add(a, b) { return a + b; }".into(),
                "const arr = new Array(1000).fill(0);".into(),
            ],
        }
    }

    pub fn warmup(&self, runtime: &mut V8Runtime) {
        for script in &self.warmup_scripts {
            runtime.execute_script(script).unwrap();
        }
    }
}

Module System Source Code Implementation

ESM Module Loader

// src/module_system/esm_loader.rs
use std::collections::HashMap;
use std::path::PathBuf;
use tokio::fs;

pub struct ESMLoader {
    module_cache: HashMap<String, String>,
    base_path: PathBuf,
}

impl ESMLoader {
    pub fn new(base_path: PathBuf) -> Self {
        ESMLoader {
            module_cache: HashMap::new(),
            base_path,
        }
    }

    pub async fn load_module(&mut self, module_path: &str) -> Result<String, String> {
        // Check cache
        if let Some(cached) = self.module_cache.get(module_path) {
            return Ok(cached.clone());
        }

        // Build full path
        let full_path = self.base_path.join(module_path);

        // Asynchronously read file
        let content = fs::read_to_string(full_path)
            .await
            .map_err(|e| format!("Failed to read module: {}", e))?;

        // Cache module
        self.module_cache.insert(module_path.to_string(), content.clone());

        Ok(content)
    }
}

// Dynamic import optimization implementation
pub struct DynamicImportOptimizer {
    preload_queue: Vec<String>,
}

impl DynamicImportOptimizer {
    pub fn new() -> Self {
        DynamicImportOptimizer {
            preload_queue: Vec::new(),
        }
    }

    pub fn predict_and_preload(&mut self, current_module: &str) {
        // Simple prediction algorithm: predict dependencies based on current module name
        if current_module.ends_with(".js") {
            let predicted = current_module.replace(".js", "_utils.js");
            self.preload_queue.push(predicted);
        }
    }

    pub async fn preload_modules(&self, loader: &mut ESMLoader) {
        for module in &self.preload_queue {
            if !loader.module_cache.contains_key(module) {
                let _ = loader.load_module(module).await;
            }
        }
    }
}

Built-in Toolchain Source Code Implementation

Package Manager Core Logic

// src/tools/package_manager.rs
use semver::VersionReq;
use std::collections::HashMap;

pub struct PackageManager {
    installed_packages: HashMap<String, VersionReq>,
}

impl PackageManager {
    pub fn new() -> Self {
        PackageManager {
            installed_packages: HashMap::new(),
        }
    }

    pub fn install(&mut self, name: &str, version_req: &str) -> Result<(), String> {
        let req = VersionReq::parse(version_req)
            .map_err(|e| format!("Invalid version requirement: {}", e))?;

        // Simulate installation process
        println!("Installing {}@{}", name, version_req);

        self.installed_packages.insert(name.to_string(), req);
        Ok(())
    }

    pub fn uninstall(&mut self, name: &str) -> Result<(), String> {
        if self.installed_packages.remove(name).is_none() {
            return Err(format!("Package {} not installed", name));
        }
        Ok(())
    }

    pub fn update(&mut self, name: &str, new_version_req: &str) -> Result<(), String> {
        self.uninstall(name)?;
        self.install(name, new_version_req)
    }
}

Test Framework Integration

// src/tools/test_framework.rs
pub struct TestRunner {
    test_cases: Vec<Box<dyn TestCase>>,
}

pub trait TestCase {
    fn run(&self) -> bool;
    fn name(&self) -> &str;
}

impl TestRunner {
    pub fn new() -> Self {
        TestRunner {
            test_cases: Vec::new(),
        }
    }

    pub fn add_test_case(&mut self, test_case: Box<dyn TestCase>) {
        self.test_cases.push(test_case);
    }

    pub fn run_all(&self) -> TestResults {
        let mut passed = 0;
        let mut failed = 0;

        for test_case in &self.test_cases {
            if test_case.run() {
                passed += 1;
                println!("✓ {}", test_case.name());
            } else {
                failed += 1;
                println!("✗ {}", test_case.name());
            }
        }

        TestResults { passed, failed }
    }
}

pub struct TestResults {
    pub passed: usize,
    pub failed: usize,
}

Lightweight Event Loop Source Code Implementation

Event Loop Core

// src/event_loop.rs
use std::collections::VecDeque;
use std::future::Future;
use std::pin::Pin;
use std::sync::{Arc, Mutex};
use tokio::sync::mpsc;

pub struct EventLoop {
    task_queue: Arc<Mutex<VecDeque<Pin<Box<dyn Future<Output = ()> + Send>>>>>,
    notifier: mpsc::Sender<()>,
}

impl EventLoop {
    pub fn new() -> Self {
        let (notifier, mut receiver) = mpsc::channel(32);
        let task_queue = Arc::new(Mutex::new(VecDeque::new()));

        // Start event loop thread
        let queue_clone = task_queue.clone();
        tokio::spawn(async move {
            while let Some(_) = receiver.recv().await {
                let mut queue = queue_clone.lock().unwrap();
                while let Some(task) = queue.pop_front() {
                    task.await;
                }
            }
        });

        EventLoop { task_queue, notifier }
    }

    pub fn spawn<F>(&self, future: F)
    where
        F: Future<Output = ()> + Send + 'static,
    {
        let mut queue = self.task_queue.lock().unwrap();
        queue.push_back(Box::pin(future));
        let _ = self.notifier.try_send(());
    }
}

Performance Optimization Mechanism Source Code Implementation

Memory Management Strategy

// src/memory_manager.rs
use std::alloc::{GlobalAlloc, System};
use std::sync::atomic::{AtomicUsize, Ordering};

pub struct TrackingAllocator;

static ALLOCATED: AtomicUsize = AtomicUsize::new(0);

unsafe impl GlobalAlloc for TrackingAllocator {
    unsafe fn alloc(&self, layout: std::alloc::Layout) -> *mut u8 {
        let ret = System.alloc(layout);
        if !ret.is_null() {
            ALLOCATED.fetch_add(layout.size(), Ordering::SeqCst);
        }
        ret
    }

    unsafe fn dealloc(&self, ptr: *mut u8, layout: std::alloc::Layout) {
        System.dealloc(ptr, layout);
        ALLOCATED.fetch_sub(layout.size(), Ordering::SeqCst);
    }
}

pub fn current_memory_usage() -> usize {
    ALLOCATED.load(Ordering::SeqCst)
}

#[global_allocator]
static GLOBAL: TrackingAllocator = TrackingAllocator;

Cache Strategy Implementation

// src/cache.rs
use std::collections::HashMap;
use std::hash::Hash;
use std::time::{Duration, Instant};

pub struct Cache<K, V> 
where
    K: Eq + Hash,
{
    store: HashMap<K, CacheEntry<V>>,
    ttl: Duration,
}

struct CacheEntry<V> {
    value: V,
    expires_at: Instant,
}

impl<K, V> Cache<K, V>
where
    K: Eq + Hash,
{
    pub fn new(ttl: Duration) -> Self {
        Cache {
            store: HashMap::new(),
            ttl,
        }
    }

    pub fn get(&mut self, key: &K) -> Option<&V> {
        if let Some(entry) = self.store.get(key) {
            if entry.expires_at > Instant::now() {
                return Some(&entry.value);
            } else {
                self.store.remove(key);
            }
        }
        None
    }

    pub fn set(&mut self, key: K, value: V) {
        let expires_at = Instant::now() + self.ttl;
        self.store.insert(key, CacheEntry { value, expires_at });
    }

    pub fn cleanup(&mut self) {
        let now = Instant::now();
        self.store.retain(|_, entry| entry.expires_at > now);
    }
}

Network and File System Source Code

HTTP Server and Client Source Code Implementation

HTTP Server Core

// src/network/http/server.rs
use std::net::SocketAddr;
use tokio::net::TcpListener;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

pub struct HttpServer {
    addr: SocketAddr,
}

impl HttpServer {
    pub fn new(addr: SocketAddr) -> Self {
        HttpServer { addr }
    }

    pub async fn run(&self) -> Result<(), std::io::Error> {
        let listener = TcpListener::bind(self.addr).await?;
        println!("HTTP server listening on {}", self.addr);

        loop {
            let (mut socket, _) = listener.accept().await?;
            tokio::spawn(async move {
                let mut buf = [0; 1024];
                let n = match socket.read(&mut buf).await {
                    Ok(n) if n == 0 => return,
                    Ok(n) => n,
                    Err(e) => {
                        eprintln!("failed to read from socket; err = {:?}", e);
                        return;
                    }
                };

                let request = String::from_utf8_lossy(&buf[..n]);
                println!("Received request:\n{}", request);

                let response = "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n\r\nHello, World!";
                if let Err(e) = socket.write_all(response.as_bytes()).await {
                    eprintln!("failed to write to socket; err = {:?}", e);
                }
            });
        }
    }
}

HTTP Client Implementation

// src/network/http/client.rs
use std::time::Duration;
use tokio::net::TcpStream;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

pub struct HttpClient;

impl HttpClient {
    pub async fn get(url: &str) -> Result<String, String> {
        // Simplified URL parsing
        let host = if let Some(host) = url.strip_prefix("http://") {
            host.split('/').next().unwrap_or("localhost")
        } else {
            return Err("Only http:// URLs are supported".into());
        };

        let port = 80;
        let path = if let Some(path) = url.strip_prefix(&format!("http://{}", host)) {
            if path.is_empty() {
                "/"
            } else {
                path
            }
        } else {
            "/"
        };

        // Establish TCP connection
        let mut stream = TcpStream::connect(format!("{}:{}", host, port))
            .await
            .map_err(|e| format!("Failed to connect: {}", e))?;

        // Send HTTP request
        let request = format!(
            "GET {} HTTP/1.1\r\nHost: {}\r\nConnection: close\r\n\r\n",
            path, host
        );
        stream
            .write_all(request.as_bytes())
            .await
            .map_err(|e| format!("Failed to send request: {}", e))?;

        // Read response
        let mut response = Vec::new();
        stream
            .read_to_end(&mut response)
            .await
            .map_err(|e| format!("Failed to read response: {}", e))?;

        Ok(String::from_utf8_lossy(&response).to_string())
    }
}

File System Operations Source Code Implementation

Asynchronous File Read/Write

// src/fs/async_fs.rs
use tokio::fs;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

pub struct AsyncFileSystem;

impl AsyncFileSystem {
    pub async fn read_file(path: &str) -> Result<String, std::io::Error> {
        let mut file = fs::File::open(path).await?;
        let mut contents = String::new();
        file.read_to_string(&mut contents).await?;
        Ok(contents)
    }

    pub async fn write_file(path: &str, contents: &str) -> Result<(), std::io::Error> {
        let mut file = fs::File::create(path).await?;
        file.write_all(contents.as_bytes()).await?;
        Ok(())
    }

    pub async fn copy_file(src: &str, dest: &str) -> Result<u64, std::io::Error> {
        fs::copy(src, dest).await
    }
}

High-Performance File Read/Write

// src/fs/high_performance_fs.rs
use tokio::fs::File;
use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, BufWriter};

pub struct HighPerformanceFileSystem;

impl HighPerformanceFileSystem {
    pub async fn read_large_file(path: &str) -> Result<Vec<u8>, std::io::Error> {
        let file = File::open(path).await?;
        let mut reader = BufReader::new(file);
        let mut buffer = Vec::new();
        reader.read_to_end(&mut buffer).await?;
        Ok(buffer)
    }

    pub async fn write_large_file(path: &str, data: &[u8]) -> Result<(), std::io::Error> {
        let file = File::create(path).await?;
        let mut writer = BufWriter::new(file);
        writer.write_all(data).await?;
        writer.flush().await?;
        Ok(())
    }
}

WebSocket Source Code Implementation

WebSocket Server

// src/network/websocket/server.rs
use tokio::net::{TcpListener, TcpStream};
use tokio_tungstenite::tungstenite::protocol::Message;
use futures_util::{SinkExt, StreamExt};

pub struct WebSocketServer {
    addr: String,
}

impl WebSocketServer {
    pub fn new(addr: &str) -> Self {
        WebSocketServer {
            addr: addr.to_string(),
        }
    }

    pub async fn run(&self) -> Result<(), Box<dyn std::error::Error>> {
        let listener = TcpListener::bind(&self.addr).await?;
        println!("WebSocket server listening on ws://{}", self.addr);

        while let Ok((stream, _)) = listener.accept().await {
            tokio::spawn(handle_connection(stream));
        }

        Ok(())
    }
}

async fn handle_connection(stream: TcpStream) {
    let ws_stream = tokio_tungstenite::accept_async(stream)
        .await
        .expect("WebSocket handshake failed");

    let (mut write, mut read) = ws_stream.split();

    while let Some(msg) = read.next().await {
        match msg {
            Ok(Message::Text(text)) => {
                println!("Received text message: {}", text);
                if let Err(e) = write.send(Message::Text(format!("Echo: {}", text))).await {
                    eprintln!("Error sending message: {}", e);
                    break;
                }
            }
            Ok(Message::Close(_)) => {
                println!("Client disconnected");
                break;
            }
            Err(e) => {
                eprintln!("Error receiving message: {}", e);
                break;
            }
            _ => {}
        }
    }
}

Network Protocol Parsing Source Code Implementation

TCP Protocol Parsing

// src/network/protocol/tcp_parser.rs
use bytes::BytesMut;

pub struct TcpParser;

impl TcpParser {
    pub fn parse(&self, data: &mut BytesMut) -> Option<TcpPacket> {
        if data.len() < 20 {
            return None; // TCP header minimum 20 bytes
        }

        let src_port = u16::from_be_bytes([data[0], data[1]]);
        let dst_port = u16::from_be_bytes([data[2], data[3]]);
        let seq_num = u32::from_be_bytes([data[4], data[5], data[6], data[7]]);
        let ack_num = u32::from_be_bytes([data[8], data[9], data[10], data[11]]);
        let data_offset = (data[12] >> 4) as usize * 4;
        let flags = data[13];

        if data.len() < data_offset {
            return None; // Insufficient data
        }

        let payload = if data_offset < data.len() {
            Some(data[data_offset..].to_vec())
        } else {
            None
        };

        Some(TcpPacket {
            src_port,
            dst_port,
            seq_num,
            ack_num,
            flags,
            payload,
        })
    }
}

pub struct TcpPacket {
    pub src_port: u16,
    pub dst_port: u16,
    pub seq_num: u32,
    pub ack_num: u32,
    pub flags: u8,
    pub payload: Option<Vec<u8>>,
}

UDP Protocol Parsing

// src/network/protocol/udp_parser.rs
use bytes::BytesMut;

pub struct UdpParser;

impl UdpParser {
    pub fn parse(&self, data: &mut BytesMut) -> Option<UdpPacket> {
        if data.len() < 8 {
            return None; // UDP header minimum 8 bytes
        }

        let src_port = u16::from_be_bytes([data[0], data[1]]);
        let dst_port = u16::from_be_bytes([data[2], data[3]]);
        let length = u16::from_be_bytes([data[4], data[5]]) as usize;
        let checksum = u16::from_be_bytes([data[6], data[7]]);

        if data.len() < length {
            return None; // Insufficient data
        }

        let payload = if length > 8 {
            Some(data[8..length].to_vec())
        } else {
            None
        };

        Some(UdpPacket {
            src_port,
            dst_port,
            length,
            checksum,
            payload,
        })
    }
}

pub struct UdpPacket {
    pub src_port: u16,
    pub dst_port: u16,
    pub length: usize,
    pub checksum: u16,
    pub payload: Option<Vec<u8>>,
}

Network Performance Optimization Source Code Implementation

Connection Pool Implementation

// src/network/connection_pool.rs
use std::collections::VecDeque;
use std::sync::{Arc, Mutex};
use tokio::net::TcpStream;

pub struct ConnectionPool {
    pool: Arc<Mutex<VecDeque<TcpStream>>>,
    max_size: usize,
}

impl ConnectionPool {
    pub fn new(max_size: usize) -> Self {
        ConnectionPool {
            pool: Arc::new(Mutex::new(VecDeque::with_capacity(max_size))),
            max_size,
        }
    }

    pub async fn get_connection(&self, addr: &str) -> Result<TcpStream, std::io::Error> {
        let mut pool = self.pool.lock().unwrap();

        if let Some(conn) = pool.pop_front() {
            Ok(conn)
        } else {
            // No available connection in pool, create new one
            TcpStream::connect(addr).await
        }
    }

    pub fn return_connection(&self, conn: TcpStream) {
        let mut pool = self.pool.lock().unwrap();
        if pool.len() < self.max_size {
            pool.push_back(conn);
        }
        // Discard connection if pool is full
    }
}

Request Batch Processing

// src/network/batch_processor.rs
use std::collections::VecDeque;
use tokio::sync::mpsc;

pub struct BatchProcessor<T> {
    batch_size: usize,
    timeout_ms: u64,
    sender: mpsc::Sender<Vec<T>>,
    receiver: mpsc::Receiver<Vec<T>>,
    buffer: VecDeque<T>,
}

impl<T: Clone + Send + 'static> BatchProcessor<T> {
    pub fn new(batch_size: usize, timeout_ms: u64) -> Self {
        let (sender, receiver) = mpsc::channel(32);
        BatchProcessor {
            batch_size,
            timeout_ms,
            sender,
            receiver,
            buffer: VecDeque::with_capacity(batch_size),
        }
    }

    pub async fn add_item(&mut self, item: T) -> Result<(), mpsc::error::SendError<Vec<T>>> {
        self.buffer.push_back(item);

        if self.buffer.len() >= self.batch_size {
            self.flush().await
        } else {
            Ok(())
        }
    }

    pub async fn flush(&mut self) -> Result<(), mpsc::error::SendError<Vec<T>>> {
        if !self.buffer.is_empty() {
            let batch = self.buffer.drain(..).collect();
            self.sender.send(batch).await
        } else {
            Ok(())
        }
    }

    pub async fn run_batcher(mut self) {
        use tokio::time::{sleep, Duration};

        loop {
            if !self.buffer.is_empty() {
                if let Err(e) = self.flush().await {
                    eprintln!("Failed to flush batch: {}", e);
                }
            } else {
                sleep(Duration::from_millis(self.timeout_ms)).await;
            }
        }
    }
}
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