@dollhousemcp/mcp-server
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DollhouseMCP - A Model Context Protocol (MCP) server that enables dynamic AI persona management from markdown files, allowing Claude and other compatible AI assistants to activate and switch between different behavioral personas.
90 lines • 12.2 kB
JavaScript
/**
* Metrics API routes for the unified dev console.
*
* Mounts on the existing Express app to provide:
* - GET /api/metrics — JSON query (delegates to MemoryMetricsSink)
* - GET /api/metrics/stream — SSE endpoint, pushes each new snapshot
*/
import { Router } from 'express';
import { UnicodeValidator } from '../../security/validators/unicodeValidator.js';
function normalizedStringParam(query, key) {
const val = query[key];
if (typeof val === 'string' && val) {
return UnicodeValidator.normalize(val).normalizedContent;
}
return undefined;
}
function parseMetricsQueryOptions(query) {
const options = {};
const names = normalizedStringParam(query, 'names');
if (names)
options['names'] = names.split(',').map(s => s.trim());
const source = normalizedStringParam(query, 'source');
if (source)
options['source'] = source;
const type = normalizedStringParam(query, 'type');
if (type)
options['type'] = type;
for (const field of ['since', 'until']) {
if (typeof query[field] === 'string' && query[field])
options[field] = query[field];
}
if (typeof query['latest'] === 'string') {
options['latest'] = query['latest'] !== 'false';
}
for (const field of ['limit', 'offset']) {
if (typeof query[field] === 'string') {
const parsed = Number.parseInt(query[field], 10);
if (!Number.isNaN(parsed))
options[field] = parsed;
}
}
return options;
}
export function createMetricsRoutes(metricsSink) {
const router = Router();
const clients = new Set();
// GET /api/metrics — JSON query
router.get('/metrics', (req, res) => {
const result = metricsSink.query(parseMetricsQueryOptions(req.query));
res.json(result);
});
// GET /api/metrics/stream — SSE endpoint for real-time metric snapshots.
// Currently unused by the built-in web console (which polls /api/metrics).
// Retained for third-party consumers (Prometheus, Grafana agent, custom dashboards)
// that benefit from push-based metric delivery.
router.get('/metrics/stream', (req, res) => {
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive',
});
res.write(':connected\n\n');
const client = { res };
clients.add(client);
// Keep-alive heartbeat — prevents proxies from closing idle connections
const heartbeat = setInterval(() => {
res.write(': heartbeat\n\n');
}, 30_000);
req.on('close', () => {
clearInterval(heartbeat);
clients.delete(client);
});
});
function onSnapshot(snapshot) {
const data = JSON.stringify(snapshot);
for (const client of clients) {
if (client.res.destroyed) {
clients.delete(client);
continue;
}
client.res.write(`data: ${data}\n\n`);
}
}
return {
router,
onSnapshot,
clientCount: () => clients.size,
};
}
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GET /api/metrics        — JSON query (delegates to MemoryMetricsSink)\n * - GET /api/metrics/stream — SSE endpoint, pushes each new snapshot\n */\n\nimport { Router } from 'express';\nimport type { Request, Response } from 'express';\nimport type { MemoryMetricsSink } from '../../metrics/sinks/MemoryMetricsSink.js';\nimport type { MetricSnapshot, MetricType } from '../../metrics/types.js';\nimport { UnicodeValidator } from '../../security/validators/unicodeValidator.js';\n\ninterface SSEClient {\n  res: Response;\n}\n\nexport interface MetricsRoutesResult {\n  router: Router;\n  onSnapshot: (snapshot: MetricSnapshot) => void;\n  clientCount: () => number;\n}\n\nfunction normalizedStringParam(query: Request['query'], key: string): string | undefined {\n  const val = query[key];\n  if (typeof val === 'string' && val) {\n    return UnicodeValidator.normalize(val).normalizedContent;\n  }\n  return undefined;\n}\n\nfunction parseMetricsQueryOptions(query: Request['query']): Record<string, unknown> {\n  const options: Record<string, unknown> = {};\n\n  const names = normalizedStringParam(query, 'names');\n  if (names) options['names'] = names.split(',').map(s => s.trim());\n\n  const source = normalizedStringParam(query, 'source');\n  if (source) options['source'] = source;\n\n  const type = normalizedStringParam(query, 'type');\n  if (type) options['type'] = type as MetricType;\n\n  for (const field of ['since', 'until'] as const) {\n    if (typeof query[field] === 'string' && query[field]) options[field] = query[field];\n  }\n  if (typeof query['latest'] === 'string') {\n    options['latest'] = query['latest'] !== 'false';\n  }\n  for (const field of ['limit', 'offset'] as const) {\n    if (typeof query[field] === 'string') {\n      const parsed = Number.parseInt(query[field], 10);\n      if (!Number.isNaN(parsed)) options[field] = parsed;\n    }\n  }\n  return options;\n}\n\nexport function createMetricsRoutes(metricsSink: MemoryMetricsSink): MetricsRoutesResult {\n  const router = Router();\n  const clients = new Set<SSEClient>();\n\n  // GET /api/metrics — JSON query\n  router.get('/metrics', (req: Request, res: Response) => {\n    const result = metricsSink.query(parseMetricsQueryOptions(req.query));\n    res.json(result);\n  });\n\n  // GET /api/metrics/stream — SSE endpoint for real-time metric snapshots.\n  // Currently unused by the built-in web console (which polls /api/metrics).\n  // Retained for third-party consumers (Prometheus, Grafana agent, custom dashboards)\n  // that benefit from push-based metric delivery.\n  router.get('/metrics/stream', (req: Request, res: Response) => {\n    res.writeHead(200, {\n      'Content-Type': 'text/event-stream',\n      'Cache-Control': 'no-cache',\n      'Connection': 'keep-alive',\n    });\n    res.write(':connected\\n\\n');\n\n    const client: SSEClient = { res };\n    clients.add(client);\n\n    // Keep-alive heartbeat — prevents proxies from closing idle connections\n    const heartbeat = setInterval(() => {\n      res.write(': heartbeat\\n\\n');\n    }, 30_000);\n\n    req.on('close', () => {\n      clearInterval(heartbeat);\n      clients.delete(client);\n    });\n  });\n\n  function onSnapshot(snapshot: MetricSnapshot): void {\n    const data = JSON.stringify(snapshot);\n    for (const client of clients) {\n      if (client.res.destroyed) { clients.delete(client); continue; }\n      client.res.write(`data: ${data}\\n\\n`);\n    }\n  }\n\n  return {\n    router,\n    onSnapshot,\n    clientCount: () => clients.size,\n  };\n}\n"]}