479 lines
16 KiB
JavaScript
479 lines
16 KiB
JavaScript
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/**
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* Phase 8: Helm Chart Extractor
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*
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* Extracts structure from Helm charts with Go template syntax:
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* - Chart.yaml: metadata, dependencies
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* - values.yaml: contract surface (configurable parameters)
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* - templates/: K8s resource types, service interactions
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*
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* Strategy: strip Go templates before YAML parse, regex-extract K8s kinds from templates.
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*/
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const fs = require('fs');
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const path = require('path');
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const jsYaml = require('js-yaml');
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/** Strip Go template directives so js-yaml can parse the structural YAML */
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function stripGoTemplates(source) {
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// Replace {{- ... -}} and {{ ... }} with empty string or placeholder
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// Multi-line blocks: {{- if ... }} ... {{- end }}
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let out = source;
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// Remove template comments {{/* ... */}}
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out = out.replace(/\{\{\/\*[\s\S]*?\*\/\}\}/g, '');
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// Replace {{ expr }} with a safe YAML placeholder
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// For values in mapping positions, replace with a quoted string
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out = out.replace(/\{\{-?\s*[\s\S]*?\s*-?\}\}/g, '"__helm_tpl__"');
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// Clean up lines that are entirely template control flow (if/range/end/define/with)
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// These often leave broken YAML structure
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out = out.split('\n').map(line => {
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const trimmed = line.trim();
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// Lines that are just template placeholders or empty after stripping
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if (trimmed === '"__helm_tpl__"') return '';
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// Lines starting with - "__helm_tpl__" that break list structure
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if (trimmed === '- "__helm_tpl__"' && !line.includes(':')) return '';
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return line;
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}).join('\n');
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return out;
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}
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/** Parse Chart.yaml — plain YAML, no templates */
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function parseChartYaml(chartDir) {
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const chartPath = path.join(chartDir, 'Chart.yaml');
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if (!fs.existsSync(chartPath)) return null;
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try {
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const doc = jsYaml.load(fs.readFileSync(chartPath, 'utf8'));
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return {
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name: doc.name || path.basename(chartDir),
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version: doc.version || '0.0.0',
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appVersion: doc.appVersion || '',
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description: doc.description || '',
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type: doc.type || 'application',
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dependencies: (doc.dependencies || []).map(d => ({
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name: d.name,
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version: d.version || '',
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repository: d.repository || '',
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condition: d.condition || '',
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isLocal: (d.repository || '').startsWith('file://'),
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})),
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};
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} catch (e) {
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return { name: path.basename(chartDir), version: '0.0.0', description: '', type: 'application', dependencies: [], _parseError: e.message };
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}
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}
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/** Extract top-level keys from values.yaml as the chart's contract surface */
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function parseValuesYaml(chartDir) {
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const valuesPath = path.join(chartDir, 'values.yaml');
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if (!fs.existsSync(valuesPath)) return { keys: [], raw: '' };
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const raw = fs.readFileSync(valuesPath, 'utf8');
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const stripped = stripGoTemplates(raw);
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try {
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const doc = jsYaml.load(stripped);
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if (!doc || typeof doc !== 'object') return { keys: [], raw };
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const keys = [];
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for (const [key, val] of Object.entries(doc)) {
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const type = Array.isArray(val) ? 'list' : typeof val === 'object' && val !== null ? 'object' : typeof val;
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keys.push({
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name: key,
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type,
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hasDefault: val !== null && val !== undefined && val !== '' && val !== '__helm_tpl__',
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defaultValue: typeof val === 'string' && val === '__helm_tpl__' ? '(templated)' :
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typeof val === 'object' ? undefined : val,
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});
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}
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return { keys, raw };
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} catch (e) {
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// Fallback: regex extract top-level keys
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const keys = [];
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const keyRegex = /^([a-zA-Z_][a-zA-Z0-9_-]*):/gm;
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let m;
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while ((m = keyRegex.exec(raw)) !== null) {
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if (!keys.find(k => k.name === m[1])) {
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keys.push({ name: m[1], type: 'unknown', hasDefault: true });
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}
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}
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return { keys, raw, _parseError: e.message };
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}
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}
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/** Scan template files for K8s resource kinds and .Values references */
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function parseTemplates(chartDir) {
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const templatesDir = path.join(chartDir, 'templates');
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if (!fs.existsSync(templatesDir)) return { resources: [], valuesRefs: new Set(), templateFiles: [] };
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const resources = [];
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const valuesRefs = new Set();
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const templateFiles = [];
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const seenResources = new Set();
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function scanDir(dir) {
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let entries;
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try { entries = fs.readdirSync(dir, { withFileTypes: true }); } catch { return; }
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for (const e of entries) {
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const fp = path.join(dir, e.name);
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if (e.isDirectory()) { scanDir(fp); continue; }
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if (!e.name.endsWith('.yaml') && !e.name.endsWith('.yml') && !e.name.endsWith('.tpl')) continue;
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const relTpl = path.relative(chartDir, fp);
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templateFiles.push(relTpl);
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let content;
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try { content = fs.readFileSync(fp, 'utf8'); } catch { continue; }
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// Extract K8s resource kinds via "kind: <Kind>" pattern
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const kindRegex = /^\s*kind:\s*([A-Z][a-zA-Z]+)/gm;
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let km;
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while ((km = kindRegex.exec(content)) !== null) {
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const kind = km[1];
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const key = `${kind}:${relTpl}`;
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if (!seenResources.has(key)) {
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seenResources.add(key);
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// Try to extract the name
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const nameRegex = /name:\s*(?:\{\{[^}]*\}\}|"[^"]*"|'[^']*'|([a-zA-Z0-9_.-]+))/;
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const nameMatch = content.slice(Math.max(0, km.index - 200), km.index + 500).match(nameRegex);
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resources.push({
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kind,
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file: relTpl,
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name: nameMatch ? (nameMatch[1] || '(templated)') : '(unknown)',
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});
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}
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}
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// Extract .Values.xxx references
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const valRegex = /\.Values\.([a-zA-Z_][a-zA-Z0-9_.]*)/g;
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let vm;
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while ((vm = valRegex.exec(content)) !== null) {
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valuesRefs.add(vm[1].split('.')[0]); // top-level key
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}
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}
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}
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scanDir(templatesDir);
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return { resources, valuesRefs: Array.from(valuesRefs), templateFiles };
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}
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/** Extract interactions: what external services/endpoints does this chart reference? */
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function extractInteractions(chartDir, chartMeta) {
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const interactions = [];
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const templatesDir = path.join(chartDir, 'templates');
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if (!fs.existsSync(templatesDir)) return interactions;
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function scanDir(dir) {
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let entries;
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try { entries = fs.readdirSync(dir, { withFileTypes: true }); } catch { return; }
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for (const e of entries) {
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const fp = path.join(dir, e.name);
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if (e.isDirectory()) { scanDir(fp); continue; }
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let content;
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try { content = fs.readFileSync(fp, 'utf8'); } catch { continue; }
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// Service references: <service>.<namespace>.svc.cluster.local
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const svcRegex = /([a-z][a-z0-9-]+)\.(?:\{\{[^}]*\}\}|[a-z0-9-]+)\.svc\.cluster\.local/g;
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let sm;
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while ((sm = svcRegex.exec(content)) !== null) {
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interactions.push({ type: 'k8s-service', target: sm[1], file: path.relative(chartDir, fp) });
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}
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// ConfigMap/Secret references in envFrom or volumeMounts
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const configRefRegex = /configMapKeyRef:\s*\n\s*name:\s*([^\n]+)|secretKeyRef:\s*\n\s*name:\s*([^\n]+)/g;
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let cr;
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while ((cr = configRefRegex.exec(content)) !== null) {
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let ref = (cr[1] || cr[2] || '').trim().replace(/["'{}]/g, '');
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if (ref.includes('helm_tpl') || ref.includes('__helm')) continue;
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// Strip Go template noise — if it's mostly template syntax, skip it
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if (ref.includes('tpl') || ref.includes('.Values') || ref.includes('include') || ref.includes('$')) continue;
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if (!ref || ref.length < 2) continue;
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interactions.push({ type: 'config-ref', target: ref, file: path.relative(chartDir, fp) });
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}
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// Port references (containerPort, port, targetPort)
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const portRegex = /(?:containerPort|port|targetPort):\s*(\d+)/g;
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let pr;
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while ((pr = portRegex.exec(content)) !== null) {
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interactions.push({ type: 'port', target: pr[1], file: path.relative(chartDir, fp) });
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}
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}
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}
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scanDir(templatesDir);
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// Deduplicate
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const seen = new Set();
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return interactions.filter(i => {
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const key = `${i.type}:${i.target}`;
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if (seen.has(key)) return false;
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seen.add(key);
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return true;
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});
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}
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/**
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* Discover and extract all Helm charts under a root directory.
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* @param {string} rootDir - Root directory to scan
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* @param {Set<string>} ignoreDirs - Directory names to skip
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* @returns {Array<object>} Array of chart descriptors
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*/
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function discoverCharts(rootDir, ignoreDirs) {
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const charts = [];
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const ignore = ignoreDirs || new Set(['node_modules', '.git', 'venv', '__pycache__', '.terraform']);
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function walk(dir, depth) {
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if (depth > 10) return; // safety
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let entries;
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try { entries = fs.readdirSync(dir, { withFileTypes: true }); } catch { return; }
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// Check if this directory is a chart
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const hasChart = entries.some(e => e.isFile() && e.name === 'Chart.yaml');
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if (hasChart) {
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const chartMeta = parseChartYaml(dir);
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const values = parseValuesYaml(dir);
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const templates = parseTemplates(dir);
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const interactions = extractInteractions(dir, chartMeta);
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charts.push({
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dir: path.relative(rootDir, dir),
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chart: chartMeta,
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values,
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templates,
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interactions,
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});
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}
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// Recurse into subdirectories
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for (const e of entries) {
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if (!e.isDirectory()) continue;
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if (ignore.has(e.name)) continue;
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walk(path.join(dir, e.name), depth + 1);
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}
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}
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walk(rootDir, 0);
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return charts;
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}
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/**
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* Convert chart data into graph entities and relationships for the pipeline.
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* @param {Array} charts - From discoverCharts
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* @param {string} rootDir - Root directory
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* @returns {{ entities: Array, relationships: Array }}
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*/
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function chartsToGraph(charts, rootDir) {
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const entities = [];
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const relationships = [];
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for (const c of charts) {
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const chartId = `helm:${c.chart.name}@${c.dir}`;
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// Chart as a module
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entities.push({
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id: chartId,
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type: 'HelmChart',
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name: c.chart.name,
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kind: 'helm-chart',
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visibility: 'public',
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description: c.chart.description,
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version: c.chart.version,
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appVersion: c.chart.appVersion,
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chartType: c.chart.type,
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dir: c.dir,
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});
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// Values as contract fields
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for (const key of c.values.keys) {
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const keyId = `${chartId}:values:${key.name}`;
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entities.push({
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id: keyId,
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type: 'HelmValue',
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name: key.name,
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kind: 'helm-value',
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visibility: 'public',
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valueType: key.type,
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hasDefault: key.hasDefault,
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});
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relationships.push({ type: 'CONTAINS', source: chartId, target: keyId });
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}
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// K8s resources
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for (const res of c.templates.resources) {
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const resId = `${chartId}:resource:${res.kind}:${res.file}`;
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entities.push({
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id: resId,
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type: 'K8sResource',
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name: `${res.kind}`,
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kind: 'k8s-resource',
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visibility: 'public',
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resourceKind: res.kind,
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file: res.file,
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});
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relationships.push({ type: 'PRODUCES', source: chartId, target: resId });
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}
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// Dependencies (chart → chart)
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for (const dep of c.chart.dependencies) {
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// Find the dependency chart
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const depChart = charts.find(dc => dc.chart.name === dep.name);
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if (depChart) {
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const depId = `helm:${depChart.chart.name}@${depChart.dir}`;
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relationships.push({ type: 'DEPENDS_ON', source: chartId, target: depId, condition: dep.condition });
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} else {
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// External dependency
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const extId = `helm-ext:${dep.name}`;
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if (!entities.find(e => e.id === extId)) {
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entities.push({
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id: extId,
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type: 'HelmChart',
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name: dep.name,
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kind: 'helm-chart-external',
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visibility: 'public',
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version: dep.version,
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repository: dep.repository,
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});
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}
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relationships.push({ type: 'DEPENDS_ON', source: chartId, target: extId, condition: dep.condition });
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}
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}
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// Service interactions
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for (const interaction of c.interactions) {
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if (interaction.type === 'k8s-service') {
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// Find chart that produces this service
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const targetChart = charts.find(tc => {
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return tc.templates.resources.some(r => r.kind === 'Service') &&
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tc.chart.name.includes(interaction.target);
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});
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if (targetChart && targetChart.chart.name !== c.chart.name) {
|
||
|
|
const targetId = `helm:${targetChart.chart.name}@${targetChart.dir}`;
|
||
|
|
relationships.push({ type: 'CALLS', source: chartId, target: targetId, via: interaction.target });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return { entities, relationships };
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Generate a Mermaid diagram showing cross-chart interactions.
|
||
|
|
* Groups charts by subsystem (top-level dir) and shows dependency/service edges.
|
||
|
|
*/
|
||
|
|
function generateHelmDiagram(charts) {
|
||
|
|
const lines = ['graph TD'];
|
||
|
|
|
||
|
|
// Use dir-based IDs to avoid collisions between same-named charts
|
||
|
|
function chartId(c) {
|
||
|
|
return c.dir.replace(/[^a-zA-Z0-9]/g, '_');
|
||
|
|
}
|
||
|
|
|
||
|
|
// Group charts by subsystem (first path segment)
|
||
|
|
const groups = {};
|
||
|
|
for (const c of charts) {
|
||
|
|
const sub = c.dir.split('/')[0] || 'root';
|
||
|
|
if (!groups[sub]) groups[sub] = [];
|
||
|
|
groups[sub].push(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emit subgraphs
|
||
|
|
for (const [sub, subCharts] of Object.entries(groups)) {
|
||
|
|
const safeSubId = sub.replace(/[^a-zA-Z0-9]/g, '_');
|
||
|
|
lines.push(` subgraph ${safeSubId}["${sub}"]`);
|
||
|
|
for (const c of subCharts) {
|
||
|
|
const id = chartId(c);
|
||
|
|
const resCount = c.templates.resources.length;
|
||
|
|
lines.push(` ${id}["${c.chart.name}<br/>${resCount} resources"]`);
|
||
|
|
}
|
||
|
|
lines.push(' end');
|
||
|
|
}
|
||
|
|
|
||
|
|
// Build lookup: chart name → chart objects (may be multiple)
|
||
|
|
const nameIndex = {};
|
||
|
|
for (const c of charts) {
|
||
|
|
if (!nameIndex[c.chart.name]) nameIndex[c.chart.name] = [];
|
||
|
|
nameIndex[c.chart.name].push(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emit dependency edges
|
||
|
|
const seenEdges = new Set();
|
||
|
|
for (const c of charts) {
|
||
|
|
const srcId = chartId(c);
|
||
|
|
for (const dep of c.chart.dependencies) {
|
||
|
|
// Find dep chart — prefer one in same subsystem tree
|
||
|
|
const candidates = nameIndex[dep.name] || [];
|
||
|
|
let target = candidates.find(dc => c.dir.startsWith(dc.dir.split('/')[0])) || candidates[0];
|
||
|
|
if (!target || chartId(target) === srcId) continue;
|
||
|
|
const tgtId = chartId(target);
|
||
|
|
const edgeKey = `${srcId}->${tgtId}`;
|
||
|
|
if (!seenEdges.has(edgeKey)) {
|
||
|
|
seenEdges.add(edgeKey);
|
||
|
|
lines.push(` ${srcId} -->|depends| ${tgtId}`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emit shared-secret edges (charts that reference the same config-ref)
|
||
|
|
const configUsers = {};
|
||
|
|
for (const c of charts) {
|
||
|
|
for (const i of c.interactions) {
|
||
|
|
if (i.type === 'config-ref') {
|
||
|
|
if (!configUsers[i.target]) configUsers[i.target] = [];
|
||
|
|
configUsers[i.target].push(c);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for (const [secret, users] of Object.entries(configUsers)) {
|
||
|
|
// Deduplicate by chart dir
|
||
|
|
const unique = [...new Map(users.map(u => [u.dir, u])).values()];
|
||
|
|
if (unique.length > 1) {
|
||
|
|
for (let i = 0; i < unique.length - 1; i++) {
|
||
|
|
const srcId = chartId(unique[i]);
|
||
|
|
const tgtId = chartId(unique[i + 1]);
|
||
|
|
const edgeKey = `${srcId}<->${tgtId}:${secret}`;
|
||
|
|
if (!seenEdges.has(edgeKey)) {
|
||
|
|
seenEdges.add(edgeKey);
|
||
|
|
lines.push(` ${srcId} -.-|${secret}| ${tgtId}`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emit k8s-service edges
|
||
|
|
for (const c of charts) {
|
||
|
|
const srcId = chartId(c);
|
||
|
|
for (const i of c.interactions) {
|
||
|
|
if (i.type === 'k8s-service') {
|
||
|
|
const tgtId = i.target.replace(/[^a-zA-Z0-9]/g, '_');
|
||
|
|
const edgeKey = `${srcId}--svc-->${tgtId}`;
|
||
|
|
if (!seenEdges.has(edgeKey)) {
|
||
|
|
seenEdges.add(edgeKey);
|
||
|
|
lines.push(` ${srcId} ==>|svc: ${i.target}| ${tgtId}`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return lines.join('\n');
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
stripGoTemplates,
|
||
|
|
parseChartYaml,
|
||
|
|
parseValuesYaml,
|
||
|
|
parseTemplates,
|
||
|
|
extractInteractions,
|
||
|
|
discoverCharts,
|
||
|
|
chartsToGraph,
|
||
|
|
generateHelmDiagram
|
||
|
|
};
|