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Replace request with node-fetch, implement retry-on-error

This commit is contained in:
Mattéo Delabre 2020-11-28 15:35:44 +01:00
parent 31fd89ad58
commit 3cc2c25775
Signed by: matteo
GPG Key ID: AE3FBD02DC583ABB
3 changed files with 41 additions and 360 deletions
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59
explore/api.mjs
View File

@ -1,46 +1,53 @@
import util from 'util';
import request from 'request';
import fetch from 'node-fetch';
const YOUTUBE_BASE = 'https://www.youtube.com/%s';
const WATCH_BASE = util.format(YOUTUBE_BASE, 'watch?v=%s');
const PLAYER_REGEX = /ytplayer\.config = (\{.*?\});/;
const PLAYER_CONFIG_REGEX = /ytplayer\.config = (\{.*?\});/;
/**
* Make a promise that is resolved in a point in the future.
*
* @param Number time Time to wait before resolving the promise (ms).
* @return null
*/
const sleep = time => new Promise(resolve => setTimeout(resolve, time));
/**
* Fetch the `ytplayer.config` object for a YouTube video.
*
* @async
* @param videoId Identifier of the video to fetch.
* @return The player configuration object.
* @param String videoId Identifier of the video to fetch.
* @param Number retries Allowed number of retries after fetch errors.
* @param Number cooldown Time to wait before retrying (ms).
* @return Object The player configuration object.
*/
export const getPlayerConfig = videoId =>
export const getPlayerConfig = async (videoId, retries = 3, cooldown = 1000) =>
{
const url = util.format(WATCH_BASE, videoId);
return new Promise((resolve, reject) =>
{
request(url, (err, _, body) =>
{
if (err)
{
reject(err);
return;
}
const res = await fetch(url);
const body = await res.text();
// Look for the definition of ytplayer.config and unserialize it
// and the player_response subobject
try
const configSearch = body.match(PLAYER_CONFIG_REGEX);
if (configSearch === null)
{
const playerConfig = JSON.parse(body.match(PLAYER_REGEX)[1]);
playerConfig.args.player_response
= JSON.parse(playerConfig.args.player_response);
resolve(playerConfig);
}
catch (err)
if (retries > 0)
{
reject(err);
console.info(`Error while fetching ${videoId}, retrying in ${cooldown} ms`);
await sleep(cooldown);
return getPlayerConfig(videoId, retries - 1, cooldown * 2);
}
});
});
else
{
throw new Error('Unable to find player configuration');
}
}
const config = JSON.parse(configSearch[1]);
config.args.player_response = JSON.parse(config.args.player_response);
return config;
};
/**

334
package-lock.json generated
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@ -4,336 +4,10 @@
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6
package.json
View File

@ -1,7 +1,7 @@
{
"name": "epenser-maze",
"name": "youtube-maze",
"private": true,
"version": "0.2.0",
"version": "0.3.0",
"main": "src/index.js",
"license": "CC0",
"scripts": {
@ -9,6 +9,6 @@
"defakator": "mkdir -p build && node explore/index.mjs XM1ssJ8yxdg build/defakator.dot && dot -Tsvg build/defakator.dot -o build/defakator.svg"
},
"dependencies": {
"request": "^2.88.2"
"node-fetch": "^2.6.1"
}
}