markdown-mermaid-converter-cli/dist/diagramCache.js

CLI tool to convert Markdown files with Mermaid diagrams to various formats (PDF, etc.)

import * as crypto from 'crypto';
import { renderMermaid } from './mermaidRenderer.js';
export class DiagramCache {
    static instance;
    cache = new Map();
    hits = 0;
    misses = 0;
    constructor() { }
    static getInstance() {
        if (!DiagramCache.instance) {
            DiagramCache.instance = new DiagramCache();
        }
        return DiagramCache.instance;
    }
    generateHash(mermaidCode) {
        return crypto.createHash('sha256').update(mermaidCode.trim()).digest('hex');
    }
    async getOrRender(mermaidCode, tempImagePath) {
        const hash = this.generateHash(mermaidCode);
        const cached = this.cache.get(hash);
        if (cached) {
            this.hits++;
            return cached.base64Data;
        }
        this.misses++;
        await renderMermaid(mermaidCode, tempImagePath);
        const { promises: fs } = await import('fs');
        const imageBuffer = await fs.readFile(tempImagePath);
        const base64Data = imageBuffer.toString('base64');
        this.cache.set(hash, {
            base64Data,
            timestamp: Date.now()
        });
        return base64Data;
    }
    getStats() {
        const totalRequests = this.hits + this.misses;
        const hitRate = totalRequests > 0 ? (this.hits / totalRequests) * 100 : 0;
        return {
            totalEntries: this.cache.size,
            hitRate: Math.round(hitRate * 100) / 100
        };
    }
    destroy() {
        this.cache.clear();
        this.hits = 0;
        this.misses = 0;
        DiagramCache.instance = null;
    }
}
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