Question

我正在尝试使用axios流式处理传入的响应。响应是一个带有许多键的大型JSON对象，但我只想要一个特定的键。但是此特定键中的值是一个具有数十兆字节数据的数组。有效负载如下所示：

{
  "requestTime": "20190606",
  "fuelStations": [{
    "a": "begin",
    ...
  }, {
    "a": "massive",
    ...
  }, {
    "a": "array",
    ...
  }, {
    "a": "here",
    ...
  }],
  "some-other-key": "goes here",
  ...
}

这是我用于axios的功能。但是我不确定如何在响应中从流中获取fuelStations数组。

axios.get(baseUrl, { responseType: "stream" }).then(response => {
  const stream = response.data;

  stream.on("data", chunk => {
    // ???
    // do something with just the fuelStations key, discard everything else
  };

  stream.on("end", () => console.log("all done streaming"));
});

Answer 1

我最终使用了stream-json软件包。代码看起来像这样：

const stream = await axios
  .get(baseUrl, { responseType: "stream" })
  .then(response => response.data);

const pipeline = stream
  .pipe(Pick.withParser({ filter: "fuel_stations" }))
  .pipe(streamArray());

pipeline.on("data", ({ value }) => console.log(value));
pipeline.on("end", () => console.log("end"));

使用axios流式传输响应，但只需要特定的密钥

1 个答案: