@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.
121 lines • 15.7 kB
JavaScript
/**
* In-memory ring buffer sink for metric snapshots.
*
* Stores snapshots in an EvictingQueue and provides a query interface
* for the MCP query_metrics tool. Follows the same query pattern as
* MemoryLogSink (see src/logging/sinks/MemoryLogSink.ts).
*/
import { EvictingQueue } from '../../utils/EvictingQueue.js';
export class MemoryMetricsSink {
name = 'MemoryMetricsSink';
queue;
constructor(maxSnapshots = 240) {
this.queue = new EvictingQueue(maxSnapshots);
}
onSnapshot(snapshot) {
this.queue.push(snapshot);
}
async flush() {
// No-op — in-memory, nothing to flush.
}
async close() {
this.queue.clear();
}
query(options) {
const latest = options?.latest ?? true;
const limit = Math.min(Math.max(options?.limit ?? 1, 0), 100);
const offset = Math.max(options?.offset ?? 0, 0);
const allSnapshots = this.queue.toArray();
// Compute availability bounds BEFORE filtering
const oldestAvailable = allSnapshots.length > 0 ? allSnapshots[0].timestamp : '';
const newestAvailable = allSnapshots.length > 0 ? allSnapshots.at(-1).timestamp : '';
// If limit is 0, return empty result with bounds
if (limit === 0) {
return {
snapshots: [],
total: 0,
hasMore: false,
limit,
offset,
oldestAvailable,
newestAvailable,
};
}
// 1. Select snapshots based on latest flag
let snapshots;
if (latest) {
snapshots = allSnapshots.length > 0 ? [allSnapshots.at(-1)] : [];
}
else {
snapshots = [...allSnapshots];
}
// 2. Filter by time range
if (options?.since) {
const since = options.since;
snapshots = snapshots.filter(s => s.timestamp > since);
}
if (options?.until) {
const until = options.until;
snapshots = snapshots.filter(s => s.timestamp < until);
}
// 3. Filter metrics within each snapshot by name/source/type
if (options?.names || options?.source || options?.type) {
const filtered = [];
for (const snapshot of snapshots) {
const matchedMetrics = snapshot.metrics.filter(metric => matchesMetricFilters(metric, options));
if (matchedMetrics.length > 0) {
filtered.push({ ...snapshot, metrics: matchedMetrics });
}
}
snapshots = filtered;
}
// 4. Sort newest-first (descending timestamp)
snapshots.sort((a, b) => b.timestamp.localeCompare(a.timestamp));
// 5. Count total before pagination
const total = snapshots.length;
// 6. Paginate
snapshots = snapshots.slice(offset, offset + limit);
return {
snapshots,
total,
hasMore: offset + limit < total,
limit,
offset,
oldestAvailable,
newestAvailable,
};
}
getStats() {
return { size: this.queue.size, capacity: this.queue.capacity };
}
}
// ---------------------------------------------------------------------------
// Internal helpers
// ---------------------------------------------------------------------------
function matchesMetricFilters(metric, options) {
// Name filter: prefix match if ends with '.' or '.*', else exact match
if (options.names && options.names.length > 0) {
const matched = options.names.some(name => {
if (name.endsWith('.') || name.endsWith('.*')) {
const prefix = name.endsWith('.*') ? name.slice(0, -1) : name;
return metric.name.startsWith(prefix);
}
return metric.name === name;
});
if (!matched)
return false;
}
// Source filter: case-insensitive substring match
if (options.source) {
const needle = options.source.toLowerCase();
if (!metric.source.toLowerCase().includes(needle))
return false;
}
// Type filter: exact match
if (options.type) {
if (metric.type !== options.type)
return false;
}
return true;
}
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Follows the same query pattern as\n * MemoryLogSink (see src/logging/sinks/MemoryLogSink.ts).\n */\n\nimport { EvictingQueue } from '../../utils/EvictingQueue.js';\nimport type {\n  IMetricsSink,\n  MetricEntry,\n  MetricQueryOptions,\n  MetricQueryResult,\n  MetricSnapshot,\n} from '../types.js';\n\nexport class MemoryMetricsSink implements IMetricsSink {\n  readonly name = 'MemoryMetricsSink';\n  private readonly queue: EvictingQueue<MetricSnapshot>;\n\n  constructor(maxSnapshots: number = 240) {\n    this.queue = new EvictingQueue<MetricSnapshot>(maxSnapshots);\n  }\n\n  onSnapshot(snapshot: MetricSnapshot): void {\n    this.queue.push(snapshot);\n  }\n\n  async flush(): Promise<void> {\n    // No-op — in-memory, nothing to flush.\n  }\n\n  async close(): Promise<void> {\n    this.queue.clear();\n  }\n\n  query(options?: MetricQueryOptions): MetricQueryResult {\n    const latest = options?.latest ?? true;\n    const limit = Math.min(Math.max(options?.limit ?? 1, 0), 100);\n    const offset = Math.max(options?.offset ?? 0, 0);\n\n    const allSnapshots = this.queue.toArray();\n\n    // Compute availability bounds BEFORE filtering\n    const oldestAvailable = allSnapshots.length > 0 ? allSnapshots[0].timestamp : '';\n    const newestAvailable = allSnapshots.length > 0 ? allSnapshots.at(-1)!.timestamp : '';\n\n    // If limit is 0, return empty result with bounds\n    if (limit === 0) {\n      return {\n        snapshots: [],\n        total: 0,\n        hasMore: false,\n        limit,\n        offset,\n        oldestAvailable,\n        newestAvailable,\n      };\n    }\n\n    // 1. Select snapshots based on latest flag\n    let snapshots: MetricSnapshot[];\n    if (latest) {\n      snapshots = allSnapshots.length > 0 ? [allSnapshots.at(-1)!] : [];\n    } else {\n      snapshots = [...allSnapshots];\n    }\n\n    // 2. Filter by time range\n    if (options?.since) {\n      const since = options.since;\n      snapshots = snapshots.filter(s => s.timestamp > since);\n    }\n    if (options?.until) {\n      const until = options.until;\n      snapshots = snapshots.filter(s => s.timestamp < until);\n    }\n\n    // 3. Filter metrics within each snapshot by name/source/type\n    if (options?.names || options?.source || options?.type) {\n      const filtered: MetricSnapshot[] = [];\n      for (const snapshot of snapshots) {\n        const matchedMetrics = snapshot.metrics.filter(metric =>\n          matchesMetricFilters(metric, options),\n        );\n        if (matchedMetrics.length > 0) {\n          filtered.push({ ...snapshot, metrics: matchedMetrics });\n        }\n      }\n      snapshots = filtered;\n    }\n\n    // 4. Sort newest-first (descending timestamp)\n    snapshots.sort((a, b) => b.timestamp.localeCompare(a.timestamp));\n\n    // 5. Count total before pagination\n    const total = snapshots.length;\n\n    // 6. Paginate\n    snapshots = snapshots.slice(offset, offset + limit);\n\n    return {\n      snapshots,\n      total,\n      hasMore: offset + limit < total,\n      limit,\n      offset,\n      oldestAvailable,\n      newestAvailable,\n    };\n  }\n\n  getStats(): { size: number; capacity: number } {\n    return { size: this.queue.size, capacity: this.queue.capacity };\n  }\n}\n\n// ---------------------------------------------------------------------------\n// Internal helpers\n// ---------------------------------------------------------------------------\n\nfunction matchesMetricFilters(\n  metric: MetricEntry,\n  options: MetricQueryOptions,\n): boolean {\n  // Name filter: prefix match if ends with '.' or '.*', else exact match\n  if (options.names && options.names.length > 0) {\n    const matched = options.names.some(name => {\n      if (name.endsWith('.') || name.endsWith('.*')) {\n        const prefix = name.endsWith('.*') ? name.slice(0, -1) : name;\n        return metric.name.startsWith(prefix);\n      }\n      return metric.name === name;\n    });\n    if (!matched) return false;\n  }\n\n  // Source filter: case-insensitive substring match\n  if (options.source) {\n    const needle = options.source.toLowerCase();\n    if (!metric.source.toLowerCase().includes(needle)) return false;\n  }\n\n  // Type filter: exact match\n  if (options.type) {\n    if (metric.type !== options.type) return false;\n  }\n\n  return true;\n}\n"]}