perf: cache allowlist and account-id normalization

src/channels/allowlist-match.ts

@@ -16,6 +16,17 @@ export type AllowlistMatch<TSource extends string = AllowlistMatchSource> = {
   matchSource?: TSource;
 };
 
+type CachedAllowListSet = {
+  size: number;
+  set: Set<string>;
+};
+
+const ALLOWLIST_SET_CACHE = new WeakMap<string[], CachedAllowListSet>();
+const SIMPLE_ALLOWLIST_CACHE = new WeakMap<
+  Array<string | number>,
+  { normalized: string[]; size: number; wildcard: boolean; set: Set<string> }
+>();
+
 export function formatAllowlistMatchMeta(
   match?: { matchKey?: string; matchSource?: string } | null,
 ): string {
@@ -26,11 +37,12 @@ export function resolveAllowlistMatchByCandidates<TSource extends string>(params
   allowList: string[];
   candidates: Array<{ value?: string; source: TSource }>;
 }): AllowlistMatch<TSource> {
+  const allowSet = resolveAllowListSet(params.allowList);
   for (const candidate of params.candidates) {
     if (!candidate.value) {
       continue;
     }
-    if (params.allowList.includes(candidate.value)) {
+    if (allowSet.has(candidate.value)) {
       return {
         allowed: true,
         matchKey: candidate.value,
@@ -47,26 +59,57 @@ export function resolveAllowlistMatchSimple(params: {
   senderName?: string | null;
   allowNameMatching?: boolean;
 }): AllowlistMatch<"wildcard" | "id" | "name"> {
-  const allowFrom = params.allowFrom
+  const allowFrom = resolveSimpleAllowFrom(params.allowFrom);
-    .map((entry) => String(entry).trim().toLowerCase())
-    .filter(Boolean);
 
-  if (allowFrom.length === 0) {
+  if (allowFrom.size === 0) {
     return { allowed: false };
   }
-  if (allowFrom.includes("*")) {
+  if (allowFrom.wildcard) {
     return { allowed: true, matchKey: "*", matchSource: "wildcard" };
   }
 
   const senderId = params.senderId.toLowerCase();
-  if (allowFrom.includes(senderId)) {
+  if (allowFrom.set.has(senderId)) {
     return { allowed: true, matchKey: senderId, matchSource: "id" };
   }
 
   const senderName = params.senderName?.toLowerCase();
-  if (params.allowNameMatching === true && senderName && allowFrom.includes(senderName)) {
+  if (params.allowNameMatching === true && senderName && allowFrom.set.has(senderName)) {
     return { allowed: true, matchKey: senderName, matchSource: "name" };
   }
 
   return { allowed: false };
 }
+
+function resolveAllowListSet(allowList: string[]): Set<string> {
+  const cached = ALLOWLIST_SET_CACHE.get(allowList);
+  if (cached && cached.size === allowList.length) {
+    return cached.set;
+  }
+  const set = new Set(allowList);
+  ALLOWLIST_SET_CACHE.set(allowList, { size: allowList.length, set });
+  return set;
+}
+
+function resolveSimpleAllowFrom(allowFrom: Array<string | number>): {
+  normalized: string[];
+  size: number;
+  wildcard: boolean;
+  set: Set<string>;
+} {
+  const cached = SIMPLE_ALLOWLIST_CACHE.get(allowFrom);
+  if (cached && cached.size === allowFrom.length) {
+    return cached;
+  }
+
+  const normalized = allowFrom.map((entry) => String(entry).trim().toLowerCase()).filter(Boolean);
+  const set = new Set(normalized);
+  const built = {
+    normalized,
+    size: allowFrom.length,
+    wildcard: set.has("*"),
+    set,
+  };
+  SIMPLE_ALLOWLIST_CACHE.set(allowFrom, built);
+  return built;
+}

src/routing/account-id.ts

@@ -6,6 +6,10 @@ const VALID_ID_RE = /^[a-z0-9][a-z0-9_-]{0,63}$/i;
 const INVALID_CHARS_RE = /[^a-z0-9_-]+/g;
 const LEADING_DASH_RE = /^-+/;
 const TRAILING_DASH_RE = /-+$/;
+const ACCOUNT_ID_CACHE_MAX = 512;
+
+const normalizeAccountIdCache = new Map<string, string>();
+const normalizeOptionalAccountIdCache = new Map<string, string | undefined>();
 
 function canonicalizeAccountId(value: string): string {
   if (VALID_ID_RE.test(value)) {
@@ -32,7 +36,13 @@ export function normalizeAccountId(value: string | undefined | null): string {
   if (!trimmed) {
     return DEFAULT_ACCOUNT_ID;
   }
-  return normalizeCanonicalAccountId(trimmed) || DEFAULT_ACCOUNT_ID;
+  const cached = normalizeAccountIdCache.get(trimmed);
+  if (cached) {
+    return cached;
+  }
+  const normalized = normalizeCanonicalAccountId(trimmed) || DEFAULT_ACCOUNT_ID;
+  setNormalizeCache(normalizeAccountIdCache, trimmed, normalized);
+  return normalized;
 }
 
 export function normalizeOptionalAccountId(value: string | undefined | null): string | undefined {
@@ -40,5 +50,21 @@ export function normalizeOptionalAccountId(value: string | undefined | null): st
   if (!trimmed) {
     return undefined;
   }
-  return normalizeCanonicalAccountId(trimmed) || undefined;
+  if (normalizeOptionalAccountIdCache.has(trimmed)) {
+    return normalizeOptionalAccountIdCache.get(trimmed);
+  }
+  const normalized = normalizeCanonicalAccountId(trimmed) || undefined;
+  setNormalizeCache(normalizeOptionalAccountIdCache, trimmed, normalized);
+  return normalized;
+}
+
+function setNormalizeCache<T>(cache: Map<string, T>, key: string, value: T): void {
+  cache.set(key, value);
+  if (cache.size <= ACCOUNT_ID_CACHE_MAX) {
+    return;
+  }
+  const oldest = cache.keys().next();
+  if (!oldest.done) {
+    cache.delete(oldest.value);
+  }
 }

src/slack/monitor/allow-list.ts

@@ -8,8 +8,24 @@ import {
   normalizeStringEntriesLower,
 } from "../../shared/string-normalization.js";
 
+const SLACK_SLUG_CACHE_MAX = 512;
+const slackSlugCache = new Map<string, string>();
+
 export function normalizeSlackSlug(raw?: string) {
-  return normalizeHyphenSlug(raw);
+  const key = raw ?? "";
+  const cached = slackSlugCache.get(key);
+  if (cached !== undefined) {
+    return cached;
+  }
+  const normalized = normalizeHyphenSlug(raw);
+  slackSlugCache.set(key, normalized);
+  if (slackSlugCache.size > SLACK_SLUG_CACHE_MAX) {
+    const oldest = slackSlugCache.keys().next();
+    if (!oldest.done) {
+      slackSlugCache.delete(oldest.value);
+    }
+  }
+  return normalized;
 }
 
 export function normalizeAllowList(list?: Array<string | number>) {