Add adhoc REST call debug stats

backend/src/restCallStats.ts

@@ -0,0 +1,35 @@
+import { sorter } from "./utils";
+
+Error.stackTraceLimit = Infinity;
+
+type CallStats = { method: string; path: string; source: string; count: number };
+const restCallStats: Map<string, CallStats> = new Map();
+
+const looseSnowflakeRegex = /\d{15,}/g;
+const queryParamsRegex = /\?.*$/g;
+
+export function logRestCall(method: string, path: string) {
+  const anonymizedPath = path.replace(looseSnowflakeRegex, "0000").replace(queryParamsRegex, "");
+  const stackLines = (new Error().stack || "").split("\n").slice(10); // Remove initial fluff
+  const firstSrcLine = stackLines.findIndex((line) => line.includes("/backend/src"));
+  const source = stackLines
+    .slice(firstSrcLine !== -1 ? firstSrcLine : -5)
+    .filter((l) => !l.includes("processTicksAndRejections"))
+    .join("\n");
+  const key = `${method}|${anonymizedPath}|${source}`;
+  if (!restCallStats.has(key)) {
+    restCallStats.set(key, {
+      method,
+      path: anonymizedPath,
+      source,
+      count: 0,
+    });
+  }
+  restCallStats.get(key)!.count++;
+}
+
+export function getTopRestCallStats(count: number): CallStats[] {
+  const stats = Array.from(restCallStats.values());
+  stats.sort(sorter("count", "DESC"));
+  return stats.slice(0, count);
+}