refactor: separate transit sources and request service

server/providers/common/rate-limit.js

@@ -1,38 +1,5 @@
-/**
- * Minimal fixed-window per-key rate limiter for the dev proxies. Not a hard
- * security boundary (dev-only), just a backstop so a runaway client can't hammer
- * the public Overpass / OSRM mirrors or exhaust this process.
- */
-const RATE_LIMITER_MAX_KEYS = 2000;
-
-export function makeRateLimiter({ windowMs, max, globalMax }) {
-  const hits = new Map(); // key -> number[] (timestamps within window)
-  let globalTimes = []; // all hits in window, for the global backstop
-  return function allow(key) {
-    const now = Date.now();
-    globalTimes = globalTimes.filter((t) => now - t < windowMs);
-    if (globalMax && globalTimes.length >= globalMax) return false; // global backstop
-    const recent = (hits.get(key) || []).filter((t) => now - t < windowMs);
-    if (recent.length >= max) {
-      hits.set(key, recent);
-      return false;
-    }
-    recent.push(now);
-    hits.set(key, recent);
-    globalTimes.push(now);
-    // Hard key cap so a key-rotating caller can't grow the map without bound.
-    if (hits.size > RATE_LIMITER_MAX_KEYS) {
-      const oldest = hits.keys().next().value;
-      if (oldest !== undefined) hits.delete(oldest);
-    }
-    if (hits.size > 256) {
-      for (const [k, v] of hits) {
-        if (!v.length || now - v[v.length - 1] > windowMs) hits.delete(k);
-      }
-    }
-    return true;
-  };
-}
+import { makeRateLimiter } from '../../../src/sources/rateLimit.js';
+export { makeRateLimiter } from '../../../src/sources/rateLimit.js';
 
 /**
  * Opt-in per-IP rate limiter for the cost-bearing API proxies (OpenAI / Google).