英文:
How to decode protobuf obtained via axios using typescript
问题
我是新手typescript，我正在尝试理解如何使用axios下载实时gtfs数据（以protobuf形式）。当我尝试运行此代码时，出现了非法缓冲错误。我已在下面完整地发布了错误。
英文:
I'm new to typescript, and I'm trying to understand how to use axios to download real-time gtfs data (which is in protobuf form). I'm getting an illegal buffer error when I try to run this code. I've posted the error in full below.
import axios from "axios";
import * as GtfsRealtimeBindings from "gtfs-realtime-bindings";
const url = "https://www.rtd-denver.com/files/gtfs-rt/TripUpdate.pb";
export type RealtimeGtfsUrl = string;
export async function decodeRealtimeGtfs(
url: RealtimeGtfsUrl,
): Promise<GtfsRealtimeBindings.transit_realtime.FeedMessage> {
return await axios.get(url).then((response) => {
return GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(
response.data,
);
});
}
const result = decodeRealtimeGtfs(url);
/Users/.../playground/node_modules/protobufjs/src/reader.js:47
throw Error("illegal buffer");
^
Error: illegal buffer
at create_typed_array (/Users/.../playground/node_modules/protobufjs/src/reader.js:47:15)
at create_buffer (/Users/.../playground/node_modules/protobufjs/src/reader.js:63:23)
at Function.create_buffer_setup (/Users/.../playground/node_modules/protobufjs/src/reader.js:64:15)
at Function.decode (/Users/.../playground/node_modules/gtfs-realtime-bindings/gtfs-realtime.js:134:34)
at /Users/.../playground/test.cjs:48:82
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
答案1
得分: 1
The response is in a binary format where Axios defaults to expecting JSON / plain text.
The decoder expects an ArrayBuffer so all you should need to do is tell Axios what response type to expect.
Also, don't mix await with .then(); it just makes for confusing code.
export async function decodeRealtimeGtfs(
url: RealtimeGtfsUrl,
): Promise<GtfsRealtimeBindings.transit_realtime.FeedMessage> {
const { data } = await axios.get(url, { responseType: "arraybuffer" });
return GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(data);
}
英文:
The response is in a binary format where Axios defaults to expecting JSON / plain text.
The decoder expects an ArrayBuffer so all you should need to do is tell Axios what response type to expect.
Also, don't mix await with .then(); it just makes for confusing code.
export async function decodeRealtimeGtfs(
url: RealtimeGtfsUrl,
): Promise<GtfsRealtimeBindings.transit_realtime.FeedMessage> {
const { data } = await axios.get(url, { responseType: "arraybuffer" });
return GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(data);
}
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