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const fetchFunction = async (
  request: RequestNode,
  variables: Variables,
  cacheConfig: CacheConfig,
  uploadables: ?UploadableMap,
  sink: Sink<any>,
) => {
  const body = getRequestBody(request, variables, uploadables);

  const headers = {
    ...getHeaders(uploadables),
    authorization: getToken(),
  };

  const response = await fetchWithRetries(ENV.GRAPHQL_URL, {
    method: 'POST',
    headers,
    body,
    fetchTimeout: 20000,
    retryDelays: [1000, 3000, 5000, 10000],
  });

  const data = await handleData(response);

  if (isMutation(request) && data.errors) {
    sink.error(data);
    sink.complete();

    return;
  }

  sink.next(data);
  sink.complete();
};

const executeFunction = (
  request: RequestNode,
  variables: Variables,
  cacheConfig: CacheConfig,
  uploadables: ?UploadableMap,
) => {
  return Observable.create(sink => {
    fetchFunction(request, variables, cacheConfig, uploadables, sink);
  });
};