Function discoverBackendPort

client-next/src/lib/api.ts:19–51

()

}

async function discoverBackendPort(): Promise<string> {
    if (cachedApiUrl) return cachedApiUrl;
    if (resolvingApiUrl) return resolvingApiUrl;

    resolvingApiUrl = (async () => {
        const preferred = [envApiUrl, DEFAULT_API_URL].filter(Boolean) as string[];
        for (const candidate of preferred) {
            const ok = await probeBackendUrl(candidate);
            if (ok) {
                cachedApiUrl = ok;
                return ok;
            }
        }

        for (let i = 0; i < MAX_PORT_TRIES; i++) {
            const port = BACKEND_BASE_PORT + i;
            const testUrl = `http://127.0.0.1:${port}/api`;
            const ok = await probeBackendUrl(testUrl);
            if (ok) {
                cachedApiUrl = ok;
                return ok;
            }
        }

        throw new Error(`Cannot find backend server on ports ${BACKEND_BASE_PORT}-${BACKEND_BASE_PORT + MAX_PORT_TRIES - 1}`);
    })();

    try {
        return await resolvingApiUrl;
    } finally {
        resolvingApiUrl = null;
    }
}

const envApiUrl = process.env.NEXT_PUBLIC_API_URL;