out-of-your-element/d2m/actions/speedbump.js

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// @ts-check
const DiscordTypes = require("discord-api-types/v10")
const passthrough = require("../../passthrough")
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const {discord, select, db} = passthrough
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const SPEEDBUMP_SPEED = 4000 // 4 seconds delay
const SPEEDBUMP_UPDATE_FREQUENCY = 2 * 60 * 60 // 2 hours
/** @type {Set<any>} */
const KNOWN_BOTS = new Set([
"466378653216014359" // PluralKit
])
/**
* Fetch new speedbump data for the channel and put it in the database as cache
* @param {string} channelID
* @param {number?} lastChecked
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*/
async function updateCache(channelID, lastChecked) {
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const now = Math.floor(Date.now() / 1000)
if (lastChecked && now - lastChecked < SPEEDBUMP_UPDATE_FREQUENCY) return
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const webhooks = await discord.snow.webhook.getChannelWebhooks(channelID)
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const found = webhooks.find(b => KNOWN_BOTS.has(b.application_id))
const foundApplication = found?.application_id
const foundWebhook = found?.id
db.prepare("UPDATE channel_room SET speedbump_id = ?, speedbump_webhook_id = ?, speedbump_checked = ? WHERE channel_id = ?").run(foundApplication, foundWebhook, now, channelID)
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}
/** @type {Set<string>} set of messageID */
const bumping = new Set()
/**
* Slow down a message. After it passes the speedbump, return whether it's okay or if it's been deleted.
* @param {string} messageID
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* @returns whether it was deleted
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*/
async function doSpeedbump(messageID) {
bumping.add(messageID)
await new Promise(resolve => setTimeout(resolve, SPEEDBUMP_SPEED))
return !bumping.delete(messageID)
}
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/**
* Check whether to slow down a message, and do it. After it passes the speedbump, return whether it's okay or if it's been deleted.
* @param {string} channelID
* @param {string} messageID
* @returns whether it was deleted, and data about the channel's (not thread's) speedbump
*/
async function maybeDoSpeedbump(channelID, messageID) {
let row = select("channel_room", ["thread_parent", "speedbump_id", "speedbump_webhook_id"], {channel_id: channelID}).get()
if (row?.thread_parent) row = select("channel_room", ["thread_parent", "speedbump_id", "speedbump_webhook_id"], {channel_id: row.thread_parent}).get() // webhooks belong to the channel, not the thread
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if (!row?.speedbump_webhook_id) return {affected: false, row: null} // not affected, no speedbump
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const affected = await doSpeedbump(messageID)
return {affected, row} // maybe affected, and there is a speedbump
}
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/**
* @param {string} messageID
*/
function onMessageDelete(messageID) {
bumping.delete(messageID)
}
module.exports.updateCache = updateCache
module.exports.doSpeedbump = doSpeedbump
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module.exports.maybeDoSpeedbump = maybeDoSpeedbump
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module.exports.onMessageDelete = onMessageDelete