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* Edge Runtime - For Cloudflare Workers, Deno, Bun, and other edge environments
* Provides server-side rendering without Node.js dependencies
*/
import { render } from '@coherent.js/core';
export class EdgeRuntime {
constructor(options = {}) {
this.options = {
caching: true,
streaming: false,
headers: {
'Content-Type': 'text/html; charset=utf-8',
'Cache-Control': 'public, max-age=3600',
...options.headers
},
...options
};
this.componentRegistry = new Map();
this.routeRegistry = new Map();
this.cache = new Map();
this.middleware = [];
this.renderCount = 0;
// Initialize cache cleanup if caching is enabled
if (this.options.caching) {
this.initializeCacheCleanup();
}
}
initializeCacheCleanup() {
// Simple LRU-style cleanup
if (typeof setInterval !== 'undefined') {
setInterval(() => {
if (this.cache.size > 1000) {
const entries = Array.from(this.cache.entries());
const toDelete = entries.slice(0, entries.length - 500);
toDelete.forEach(([key]) => this.cache.delete(key));
}
}, 300000); // Every 5 minutes
}
}
// Component management
registerComponent(name, component) {
this.componentRegistry.set(name, component);
return component;
}
getComponent(name) {
return this.componentRegistry.get(name);
}
// Route management
addRoute(pattern, handler) {
this.routeRegistry.set(pattern, handler);
}
matchRoute(pathname) {
for (const [pattern, handler] of this.routeRegistry) {
const match = this.matchPattern(pattern, pathname);
if (match) {
return { handler, params: match.params };
}
}
return null;
}
matchPattern(pattern, pathname) {
// Simple pattern matching - supports :param and * wildcards
if (pattern === '*' || pattern === pathname) {
return { params: {} };
}
const patternParts = pattern.split('/').filter(Boolean);
const pathParts = pathname.split('/').filter(Boolean);
if (patternParts.length !== pathParts.length) {
return null;
}
const params = {};
for (let i = 0; i < patternParts.length; i++) {
const patternPart = patternParts[i];
const pathPart = pathParts[i];
if (patternPart.startsWith(':')) {
// Parameter
params[patternPart.slice(1)] = pathPart;
} else if (patternPart !== pathPart) {
// Literal mismatch
return null;
}
}
return { params };
}
// Rendering
async renderComponent(component, props = {}, options = {}) {
const _startTime = Date.now();
try {
// Resolve component
const resolvedComponent = typeof component === 'string'
? this.getComponent(component)
: component;
if (!resolvedComponent) {
throw new Error(`Component not found: ${component}`);
}
// Check cache
const cacheKey = this.generateCacheKey(resolvedComponent, props);
if (this.options.caching && this.cache.has(cacheKey)) {
const cached = this.cache.get(cacheKey);
if (Date.now() - cached.timestamp < (options.cacheMaxAge || 300000)) { // 5 min default
return cached.html;
}
this.cache.delete(cacheKey);
}
// Render component
const vdom = resolvedComponent(props);
const html = render(vdom);
// Cache result
if (this.options.caching && options.cacheable !== false) {
this.cache.set(cacheKey, {
html,
timestamp: Date.now()
});
}
this.renderCount++;
return html;
} catch (error) {
console.error('Edge render error:', error);
throw error;
} finally {
// Track render time
if (typeof performance !== 'undefined' && performance.mark) {
performance.mark(`coherent-edge-render-${Date.now()}`);
}
}
}
generateCacheKey(component, props) {
const componentName = component.name || 'anonymous';
const propsHash = this.hashObject(props);
return `${componentName}-${propsHash}`;
}
hashObject(obj) {
const str = JSON.stringify(obj, Object.keys(obj).sort());
let hash = 0;
for (let i = 0; i < str.length; i++) {
const char = str.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash; // Convert to 32-bit integer
}
return hash.toString(36);
}
// HTTP Request handling
async handleRequest(request) {
try {
const url = new URL(request.url);
const pathname = url.pathname;
// Create context
const context = {
request,
url,
pathname,
params: {},
searchParams: Object.fromEntries(url.searchParams),
method: request.method,
headers: Object.fromEntries(request.headers),
runtime: this,
state: {} // Shared state for middleware
};
// Execute middleware chain
let middlewareIndex = 0;
const next = async () => {
if (middlewareIndex < this.middleware.length) {
const middleware = this.middleware[middlewareIndex++];
return await middleware(context, next);
}
};
// Run middleware
if (this.middleware.length > 0) {
await next();
}
// Check if middleware already sent a response
if (context.response) {
return context.response;
}
// Find matching route
const match = this.matchRoute(pathname);
if (!match) {
return this.createErrorResponse(404, 'Not Found');
}
// Add route params to context
context.params = match.params;
// Execute route handler
const result = await match.handler(context);
// Handle different response types
if (result instanceof Response) {
return result;
}
if (typeof result === 'string') {
return this.createHtmlResponse(result);
}
if (result && typeof result === 'object') {
if (result.component) {
// Render component
const html = await this.renderComponent(
result.component,
result.props || {},
result.options || {}
);
return this.createHtmlResponse(html, result.status, result.headers);
}
if (result.json) {
return this.createJsonResponse(result.json, result.status, result.headers);
}
if (result.redirect) {
return Response.redirect(result.redirect, result.status || 302);
}
}
// Default JSON response
return this.createJsonResponse(result);
} catch (error) {
console.error('Request handling error:', error);
return this.createErrorResponse(500, 'Internal Server Error');
}
}
createHtmlResponse(html, status = 200, customHeaders = {}) {
return new Response(html, {
status,
headers: {
...this.options.headers,
...customHeaders
}
});
}
createJsonResponse(data, status = 200, customHeaders = {}) {
return new Response(JSON.stringify(data), {
status,
headers: {
'Content-Type': 'application/json',
...customHeaders
}
});
}
createErrorResponse(status, message) {
const errorHtml = `
<!DOCTYPE html>
<html>
<head>
<title>Error ${status}</title>
<style>
body { font-family: Arial, sans-serif; text-align: center; padding: 50px; }
h1 { color: #e74c3c; }
</style>
</head>
<body>
<h1>Error ${status}</h1>
<p>${message}</p>
</body>
</html>
`;
return new Response(errorHtml, {
status,
headers: { 'Content-Type': 'text/html; charset=utf-8' }
});
}
// API Routes
async handleApiRequest(request, handler) {
try {
const url = new URL(request.url);
const context = {
request,
url,
method: request.method,
headers: Object.fromEntries(request.headers),
searchParams: Object.fromEntries(url.searchParams),
runtime: this
};
// Parse body for POST/PUT requests
if (request.method === 'POST' || request.method === 'PUT') {
const contentType = request.headers.get('content-type') || '';
if (contentType.includes('application/json')) {
context.body = await request.json();
} else if (contentType.includes('application/x-www-form-urlencoded')) {
const formData = await request.formData();
context.body = Object.fromEntries(formData);
} else {
context.body = await request.text();
}
}
const result = await handler(context);
if (result instanceof Response) {
return result;
}
return this.createJsonResponse(result);
} catch (error) {
console.error('API request error:', error);
return this.createJsonResponse({ error: error.message }, 500);
}
}
// Streaming support (for environments that support it)
async renderStream(component, props = {}) {
if (!this.options.streaming) {
return await this.renderComponent(component, props);
}
// Implement streaming rendering with chunked output
const encoder = new TextEncoder();
let buffer = '';
const chunkSize = this.options.streamChunkSize || 1024;
// Create a readable stream
const stream = new ReadableStream({
async start(controller) {
try {
// Helper to flush buffer
const flush = () => {
if (buffer.length > 0) {
controller.enqueue(encoder.encode(buffer));
buffer = '';
}
};
// Render component tree recursively with streaming
const renderNode = async (node) => {
if (!node || typeof node !== 'object') {
if (node !== null && node !== undefined) {
buffer += String(node);
if (buffer.length >= chunkSize) {
flush();
}
}
return;
}
// Handle arrays
if (Array.isArray(node)) {
for (const child of node) {
await renderNode(child);
}
return;
}
// Handle component objects
for (const [tag, content] of Object.entries(node)) {
if (typeof content === 'object' && content !== null) {
// Opening tag
buffer += `<${tag}`;
// Attributes
for (const [key, value] of Object.entries(content)) {
if (key !== 'children' && key !== 'text' && value !== undefined) {
buffer += ` ${key}="${String(value)}"`;
}
}
buffer += '>';
// Flush if buffer is large
if (buffer.length >= chunkSize) {
flush();
}
// Text content
if (content.text) {
buffer += String(content.text);
if (buffer.length >= chunkSize) {
flush();
}
}
// Children
if (content.children) {
await renderNode(content.children);
}
// Closing tag
buffer += `</${tag}>`;
if (buffer.length >= chunkSize) {
flush();
}
} else {
// Simple text content
buffer += `<${tag}>${String(content)}</${tag}>`;
if (buffer.length >= chunkSize) {
flush();
}
}
}
};
// Start rendering
await renderNode(component);
// Flush remaining buffer
flush();
// Close stream
controller.close();
} catch (error) {
controller.error(error);
}
}
});
return new Response(stream, {
headers: {
'Content-Type': 'text/html; charset=utf-8',
'Transfer-Encoding': 'chunked'
}
});
}
// Create app factory
createApp() {
const app = {
// Component registration
component: (name, component, opts) => this.registerComponent(name, component, opts),
// Routing
get: (pattern, handler) => this.addRoute(pattern, handler),
post: (pattern, handler) => this.addRoute(pattern, handler),
put: (pattern, handler) => this.addRoute(pattern, handler),
delete: (pattern, handler) => this.addRoute(pattern, handler),
route: (pattern, handler) => this.addRoute(pattern, handler),
// API endpoints
api: (pattern, handler) => {
this.addRoute(pattern, (context) => this.handleApiRequest(context.request, handler));
},
// Static file serving (basic)
static: (pattern) => {
this.addRoute(pattern, async () => {
// Basic static file handling
// In a real implementation, this would serve actual files
return this.createErrorResponse(404, 'Static file serving not implemented');
});
},
// Middleware support
use: (middleware) => {
if (typeof middleware !== 'function') {
throw new Error('Middleware must be a function');
}
this.middleware.push(middleware);
return app;
},
// Request handler
fetch: (request) => this.handleRequest(request),
// Utilities
render: (component, props, options) => this.renderComponent(component, props, options),
getRuntime: () => this,
getStats: () => ({
renderCount: this.renderCount,
cacheSize: this.cache.size,
componentCount: this.componentRegistry.size,
routeCount: this.routeRegistry.size
})
};
return app;
}
// Static factory methods
static createApp(options = {}) {
const runtime = new EdgeRuntime(options);
return runtime.createApp(options);
}
static async handleRequest(request, components = {}, routes = {}) {
const runtime = new EdgeRuntime();
// Register components
Object.entries(components).forEach(([name, component]) => {
runtime.registerComponent(name, component);
});
// Register routes
Object.entries(routes).forEach(([pattern, handler]) => {
runtime.addRoute(pattern, handler);
});
return await runtime.handleRequest(request);
}
}
// Helper functions for common edge runtime patterns
export function createCloudflareWorker(app) {
return {
async fetch(request, _env, _ctx) {
return await app.fetch(request);
}
};
}
export function createDenoHandler(app) {
return async (request) => {
return await app.fetch(request);
};
}
export function createBunHandler(app) {
return {
async fetch(request) {
return await app.fetch(request);
},
port: 3000
};
}
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