Function checkExistingProxy

src/proxy.ts:636–663

* Check if a proxy is already running on the given port. * Returns the wallet address if running, undefined otherwise.

(
  port: number,
)

 * Returns the wallet address if running, undefined otherwise.
 */
async function checkExistingProxy(
  port: number,
): Promise<{ wallet: string; paymentChain?: string } | undefined> {
  const controller = new AbortController();
  const timeoutId = setTimeout(() => controller.abort(), HEALTH_CHECK_TIMEOUT_MS);

  try {
    const response = await fetch(`http://127.0.0.1:${port}/health`, {
      signal: controller.signal,
    });
    clearTimeout(timeoutId);

    if (response.ok) {
      const data = (await response.json()) as {
        status?: string;
        wallet?: string;
        paymentChain?: string;
      };
      if (data.status === "ok" && data.wallet) {
        return { wallet: data.wallet, paymentChain: data.paymentChain };
      }
    }
    return undefined;
  } catch {
    clearTimeout(timeoutId);
    return undefined;
  }
}

/**
 * Error patterns that indicate a provider-side issue (not user's fault).