Function onError

src/proxy.ts:3139–3174

(err: NodeJS.ErrnoException)

  const tryListen = (attempt: number): Promise<void> => {
    return new Promise<void>((resolveAttempt, rejectAttempt) => {
      const onError = async (err: NodeJS.ErrnoException) => {
        server.removeListener("error", onError);

        if (err.code === "EADDRINUSE") {
          // Port is in use - check if a proxy is actually running
          const existingProxy2 = await checkExistingProxy(listenPort);
          if (existingProxy2) {
            // Proxy is actually running - this is fine, reuse it
            console.log(`[ClawRouter] Existing proxy detected on port ${listenPort}, reusing`);
            rejectAttempt({
              code: "REUSE_EXISTING",
              wallet: existingProxy2.wallet,
              existingChain: existingProxy2.paymentChain,
            });
            return;
          }

          // Port is in TIME_WAIT (no proxy responding) - retry after delay
          if (attempt < PORT_RETRY_ATTEMPTS) {
            console.log(
              `[ClawRouter] Port ${listenPort} in TIME_WAIT, retrying in ${PORT_RETRY_DELAY_MS}ms (attempt ${attempt}/${PORT_RETRY_ATTEMPTS})`,
            );
            rejectAttempt({ code: "RETRY", attempt });
            return;
          }

          // Max retries exceeded
          console.error(
            `[ClawRouter] Port ${listenPort} still in use after ${PORT_RETRY_ATTEMPTS} attempts`,
          );
          rejectAttempt(err);
          return;
        }

        rejectAttempt(err);
      };

      server.once("error", onError);
      server.listen(listenPort, "127.0.0.1", () => {