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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/artifacts</a> artifact_engine.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Artifact Engine
* Routes artifact types to appropriate renderers and manages caching
*/
import { createHash } from 'crypto';
import { ArtifactRenderer, ArtifactMetadata, ArtifactCacheEntry } from './types.js';
import { ArtifactVersionRegistry, CacheTagger } from './artifact_metadata.js';
import { initTreeSitter, getMetrics as getParserMetrics } from '../utils/tree_sitter.js';
/**
* Performance metrics for artifact rendering
*/
export interface ArtifactMetrics {
renderCount: number;
totalRenderTime: number;
averageRenderTime: number;
cacheHits: number;
cacheMisses: number;
cacheHitRate: number;
errors: Array<{ type: string; message: string; timestamp: number }>;
timeouts: number;
}
export class ArtifactEngine {
private renderers: Map<string, ArtifactRenderer> = <span class="cstat-no" title="statement not covered" >new Map();</span>
private cache: Map<string, ArtifactCacheEntry> = <span class="cstat-no" title="statement not covered" >new Map();</span>
private readonly maxCacheSize = <span class="cstat-no" title="statement not covered" >50;</span> // Maximum cached artifacts
private registry: ArtifactVersionRegistry = <span class="cstat-no" title="statement not covered" >new ArtifactVersionRegistry();</span>
/**
* Performance metrics tracking
*/
private metrics: ArtifactMetrics = <span class="cstat-no" title="statement not covered" >{</span>
renderCount: 0,
totalRenderTime: 0,
averageRenderTime: 0,
cacheHits: 0,
cacheMisses: 0,
cacheHitRate: 0,
errors: [],
timeouts: 0,
};
/**
* Default render timeout (5 seconds)
*/
private readonly renderTimeout = <span class="cstat-no" title="statement not covered" >5000;</span>
/**
* Register a renderer for a specific artifact type
*/
<span class="fstat-no" title="function not covered" > registerRenderer(</span>renderer: ArtifactRenderer, version?: string): void {
<span class="cstat-no" title="statement not covered" > this.renderers.set(renderer.type, renderer);</span>
// Register version if provided
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (version) {</span>
<span class="cstat-no" title="statement not covered" > this.registry.registerVersion(renderer.type, version);</span>
}
<span class="cstat-no" title="statement not covered" > console.error(`[ArtifactEngine] Registered renderer: ${renderer.type}${version ? ` (v${version})` : ''}`);</span>
}
/**
* Get all registered renderer types
*/
<span class="fstat-no" title="function not covered" > getRegisteredTypes(</span>): string[] {
<span class="cstat-no" title="statement not covered" > return Array.from(this.renderers.keys());</span>
}
/**
* Check if a renderer exists for a type
*/
<span class="fstat-no" title="function not covered" > hasRenderer(</span>type: string): boolean {
<span class="cstat-no" title="statement not covered" > return this.renderers.has(type);</span>
}
/**
* Render an artifact with caching, timeout enforcement, and performance tracking
*/
<span class="fstat-no" title="function not covered" > async </span>renderArtifact(
type: string,
data: unknown,
metadata?: Partial<ArtifactMetadata>
): Promise<{ html: string; cached: boolean; metadata: ArtifactMetadata }> {
const startTime = <span class="cstat-no" title="statement not covered" >Date.now();</span>
<span class="cstat-no" title="statement not covered" > try {</span>
// Ensure tree-sitter is initialized if this renderer needs it
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.requiresTreeSitter(type)) {</span>
<span class="cstat-no" title="statement not covered" > await this.ensureTreeSitterInit();</span>
}
// Validate renderer exists
const renderer = <span class="cstat-no" title="statement not covered" >this.renderers.get(type);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!renderer) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error(`No renderer registered for artifact type: ${type}`);</span>
}
// Create metadata
const fullMetadata: ArtifactMetadata = <span class="cstat-no" title="statement not covered" >{</span>
type,
title: metadata?.title || `${type} Artifact`,
description: metadata?.description,
timestamp: Date.now(),
};
// Check cache
const version = <span class="cstat-no" title="statement not covered" >this.registry.getVersion(type);</span>
const cacheKey = <span class="cstat-no" title="statement not covered" >CacheTagger.generateKey(type, data, version);</span>
const cached = <span class="cstat-no" title="statement not covered" >this.cache.get(cacheKey);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (cached) {</span>
<span class="cstat-no" title="statement not covered" > this.recordMetric('cacheHit', Date.now() - startTime);</span>
<span class="cstat-no" title="statement not covered" > console.error(`[ArtifactEngine] Cache hit for ${type} (${Date.now() - startTime}ms)`);</span>
<span class="cstat-no" title="statement not covered" > return {</span>
html: cached.html,
cached: true,
metadata: cached.metadata,
};
}
// Render artifact with timeout enforcement
<span class="cstat-no" title="statement not covered" > console.error(`[ArtifactEngine] Rendering ${type}...`);</span>
const html = <span class="cstat-no" title="statement not covered" >await this.renderWithTimeout(renderer, data, type);</span>
const renderTime = <span class="cstat-no" title="statement not covered" >Date.now() - startTime;</span>
<span class="cstat-no" title="statement not covered" > console.error(`[ArtifactEngine] Rendered ${type} in ${renderTime}ms`);</span>
// Update cache with version
const dataHash = <span class="cstat-no" title="statement not covered" >this.hashData(data);</span>
<span class="cstat-no" title="statement not covered" > this.addToCache(cacheKey, {</span>
metadata: fullMetadata,
html,
dataHash,
schemaVersion: version,
});
<span class="cstat-no" title="statement not covered" > this.recordMetric('cacheMiss', renderTime);</span>
<span class="cstat-no" title="statement not covered" > return {</span>
html,
cached: false,
metadata: fullMetadata,
};
} catch (error) {
const duration = <span class="cstat-no" title="statement not covered" >Date.now() - startTime;</span>
<span class="cstat-no" title="statement not covered" > this.recordError(type, error instanceof Error ? error.message : String(error));</span>
// Fall back to error placeholder
<span class="cstat-no" title="statement not covered" > return this.renderErrorPlaceholder(type, error, metadata);</span>
}
}
/**
* Clear artifact cache
*/
<span class="fstat-no" title="function not covered" > clearCache(</span>): void {
<span class="cstat-no" title="statement not covered" > this.cache.clear();</span>
<span class="cstat-no" title="statement not covered" > console.error('[ArtifactEngine] Cache cleared');</span>
}
/**
* Get cache statistics
*/
<span class="fstat-no" title="function not covered" > getCacheStats(</span>): { size: number; maxSize: number; types: Record<string, number> } {
const types: Record<string, number> = <span class="cstat-no" title="statement not covered" >{};</span>
<span class="cstat-no" title="statement not covered" > for (const [key] of this.cache.entries()) {</span>
const type = <span class="cstat-no" title="statement not covered" >key.split(':')[0];</span>
<span class="cstat-no" title="statement not covered" > types[type] = (types[type] || 0) + 1;</span>
}
<span class="cstat-no" title="statement not covered" > return {</span>
size: this.cache.size,
maxSize: this.maxCacheSize,
types,
};
}
/**
* Get performance metrics
*/
<span class="fstat-no" title="function not covered" > getMetrics(</span>): ArtifactMetrics {
// Update derived metrics
<span class="cstat-no" title="statement not covered" > this.metrics.averageRenderTime = </span>
this.metrics.renderCount > 0
? this.metrics.totalRenderTime / this.metrics.renderCount
: 0;
const totalRequests = <span class="cstat-no" title="statement not covered" >this.metrics.cacheHits + this.metrics.cacheMisses;</span>
<span class="cstat-no" title="statement not covered" > this.metrics.cacheHitRate = </span>
totalRequests > 0
? this.metrics.cacheHits / totalRequests
: 0;
<span class="cstat-no" title="statement not covered" > return { ...this.metrics };</span>
}
/**
* Check if an artifact type requires tree-sitter
*/
private <span class="fstat-no" title="function not covered" >requiresTreeSitter(</span>type: string): boolean {
// Types that need AST parsing
const parserTypes = <span class="cstat-no" title="statement not covered" >['signal_diagram', 'code_flow', 'dependency_graph'];</span>
<span class="cstat-no" title="statement not covered" > return parserTypes.includes(type);</span>
}
/**
* Ensure tree-sitter is initialized before rendering
*/
private <span class="fstat-no" title="function not covered" >async </span>ensureTreeSitterInit(): Promise<void> {
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > await initTreeSitter();</span>
// Verify initialization succeeded by checking metrics
const metrics = <span class="cstat-no" title="statement not covered" >getParserMetrics();</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (metrics.initTime === 0) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Tree-sitter metrics indicate failed initialization');</span>
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > console.error('[ArtifactEngine] Tree-sitter init failed:', error);</span>
<span class="cstat-no" title="statement not covered" > throw new Error(`WASM initialization failed: ${error instanceof Error ? error.message : String(error)}`);</span>
}
}
/**
* Render with timeout enforcement
*/
private <span class="fstat-no" title="function not covered" >async </span>renderWithTimeout(
renderer: ArtifactRenderer,
data: unknown,
type: string
): Promise<string> {
const timeoutPromise = <span class="cstat-no" title="statement not covered" >new Promise<never>(<span class="fstat-no" title="function not covered" >(_</span>, reject) => {</span>
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> {</span>
<span class="cstat-no" title="statement not covered" > this.metrics.timeouts++;</span>
<span class="cstat-no" title="statement not covered" > reject(new Error(`Render timeout: ${type} exceeded ${this.renderTimeout}ms`));</span>
}, this.renderTimeout);
});
<span class="cstat-no" title="statement not covered" > try {</span>
const html = <span class="cstat-no" title="statement not covered" >await Promise.race([</span>
renderer.render(data),
timeoutPromise,
]);
<span class="cstat-no" title="statement not covered" > return html;</span>
} catch (error) {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (error instanceof Error && error.message.includes('timeout')) {</span>
<span class="cstat-no" title="statement not covered" > throw error; </span>// Re-throw timeout errors
}
<span class="cstat-no" title="statement not covered" > throw new Error(`Render failed for ${type}: ${error instanceof Error ? error.message : String(error)}`);</span>
}
}
/**
* Record performance metric
*/
private <span class="fstat-no" title="function not covered" >recordMetric(</span>type: 'cacheHit' | 'cacheMiss', renderTime: number): void {
<span class="cstat-no" title="statement not covered" > this.metrics.renderCount++;</span>
<span class="cstat-no" title="statement not covered" > this.metrics.totalRenderTime += renderTime;</span>
<span class="cstat-no" title="statement not covered" > if (type === 'cacheHit') {</span>
<span class="cstat-no" title="statement not covered" > this.metrics.cacheHits++;</span>
} else {
<span class="cstat-no" title="statement not covered" > this.metrics.cacheMisses++;</span>
}
}
/**
* Record error for debugging
*/
private <span class="fstat-no" title="function not covered" >recordError(</span>type: string, message: string): void {
<span class="cstat-no" title="statement not covered" > this.metrics.errors.push({</span>
type,
message,
timestamp: Date.now(),
});
// Keep only last 20 errors
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.metrics.errors.length > 20) {</span>
<span class="cstat-no" title="statement not covered" > this.metrics.errors.shift();</span>
}
}
/**
* Render error placeholder when rendering fails
*/
private <span class="fstat-no" title="function not covered" >renderErrorPlaceholder(</span>
type: string,
error: unknown,
metadata?: Partial<ArtifactMetadata>
): { html: string; cached: false; metadata: ArtifactMetadata } {
const errorMessage = <span class="cstat-no" title="statement not covered" >error instanceof Error ? error.message : String(error);</span>
const html = <span class="cstat-no" title="statement not covered" >`</span>
<div style="padding: 20px; background: #fee; border: 2px solid #c33; border-radius: 8px;">
<h3 style="margin-top: 0; color: #c33;">⚠️ Artifact Rendering Failed</h3>
<p><strong>Type:</strong> ${type}</p>
<p><strong>Error:</strong> ${errorMessage}</p>
<p style="font-size: 0.9em; color: #666;">
This artifact could not be rendered. Check the console for more details.
</p>
</div>
`;
<span class="cstat-no" title="statement not covered" > return {</span>
html,
cached: false,
metadata: {
type,
title: metadata?.title || `Failed ${type} Artifact`,
description: metadata?.description,
timestamp: Date.now(),
},
};
}
/**
* Get version registry (for testing and introspection)
*/
<span class="fstat-no" title="function not covered" > getVersionRegistry(</span>): ArtifactVersionRegistry {
<span class="cstat-no" title="statement not covered" > return this.registry;</span>
}
/**
* Add entry to cache with LRU eviction
*/
private <span class="fstat-no" title="function not covered" >addToCache(</span>key: string, entry: ArtifactCacheEntry): void {
// Evict oldest entry if cache is full
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.cache.size >= this.maxCacheSize) {</span>
const firstKey = <span class="cstat-no" title="statement not covered" >this.cache.keys().next().value;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (firstKey) {</span>
<span class="cstat-no" title="statement not covered" > this.cache.delete(firstKey);</span>
}
}
<span class="cstat-no" title="statement not covered" > this.cache.set(key, entry);</span>
}
/**
* Hash data for cache key generation
*/
private <span class="fstat-no" title="function not covered" >hashData(</span>data: unknown): string {
const json = <span class="cstat-no" title="statement not covered" >JSON.stringify(data);</span>
<span class="cstat-no" title="statement not covered" > return createHash('sha256').update(json).digest('hex').substring(0, 16);</span>
}
}
</pre></td></tr></table></pre>
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at 2025-11-02T03:07:00.852Z
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