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11x speed up of subscription page generation

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My 30 subscriptions now take 25 ms to generate, instead of around 280.

Around 120 ms were saved by creating a database index.
Around 120 ms were saved by pre-compiling the pug template for video
description timestamps.
The other changes in this commit produced slight improvements.
This commit is contained in:
Cadence Ember 2021-08-26 23:47:53 +12:00
parent 0aa0505009
commit 55065e2a9e
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GPG key ID: BC1C2C61CF521B17
4 changed files with 15 additions and 9 deletions
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11
api/subscriptions.js
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@ -16,18 +16,15 @@ module.exports = [
// trigger a background refresh, needed if they came back from being inactive
refresher.skipWaiting()
// get channels
const subscriptions = user.getSubscriptions()
const template = Array(subscriptions.length).fill("?").join(", ")
channels = db.prepare(`SELECT * FROM Channels WHERE ucid IN (${template}) ORDER BY name`).all(subscriptions)
channels = db.prepare(`SELECT Channels.* FROM Channels INNER JOIN Subscriptions ON Channels.ucid = Subscriptions.ucid WHERE token = ? ORDER BY name`).all(user.token)
// get refreshed status
refreshed = db.prepare(`SELECT min(refreshed) as min, max(refreshed) as max, count(refreshed) as count FROM Channels WHERE ucid IN (${template})`).get(subscriptions)
refreshed = db.prepare(`SELECT min(refreshed) as min, max(refreshed) as max, count(refreshed) as count FROM Channels INNER JOIN Subscriptions ON Channels.ucid = Subscriptions.ucid WHERE token = ?`).get(user.token)
// get watched videos
const watchedVideos = user.getWatchedVideos()
// get videos
if (subscriptions.length) {
if (channels.length) {
hasSubscriptions = true
const template = Array(subscriptions.length).fill("?").join(", ")
videos = db.prepare(`SELECT * FROM Videos WHERE authorId IN (${template}) ORDER BY published DESC LIMIT 60`).all(subscriptions)
videos = db.prepare(`SELECT Videos.* FROM Videos INNER JOIN Subscriptions ON Videos.authorID = Subscriptions.ucid WHERE token = ? ORDER BY published DESC LIMIT 60`).all(user.token)
.map(video => {
video.publishedText = timeToPastText(video.published * 1000)
video.watched = watchedVideos.includes(video.videoId)