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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@ -1,46 +1,53 @@
import util from 'util'; import util from 'util';
import request from 'request'; import fetch from 'node-fetch';
const YOUTUBE_BASE = 'https://www.youtube.com/%s'; const YOUTUBE_BASE = 'https://www.youtube.com/%s';
const WATCH_BASE = util.format(YOUTUBE_BASE, 'watch?v=%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. * Fetch the `ytplayer.config` object for a YouTube video.
* *
* @async * @async
* @param videoId Identifier of the video to fetch. * @param String videoId Identifier of the video to fetch.
* @return The player configuration object. * @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); const url = util.format(WATCH_BASE, videoId);
const res = await fetch(url);
return new Promise((resolve, reject) => const body = await res.text();
{
request(url, (err, _, body) =>
{
if (err)
{
reject(err);
return;
}
// Look for the definition of ytplayer.config and unserialize it // Look for the definition of ytplayer.config and unserialize it
// and the player_response subobject const configSearch = body.match(PLAYER_CONFIG_REGEX);
try
if (configSearch === null)
{ {
const playerConfig = JSON.parse(body.match(PLAYER_REGEX)[1]); if (retries > 0)
playerConfig.args.player_response
= JSON.parse(playerConfig.args.player_response);
resolve(playerConfig);
}
catch (err)
{ {
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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} }

View File

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