279 lines
8.9 KiB
TypeScript
279 lines
8.9 KiB
TypeScript
import { Client } from "https://deno.land/x/postgres@v0.19.3/mod.ts";
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import { formatTimestampToPsql } from "lib/utils/formatTimestampToPostgre.ts";
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import { SnapshotScheduleType } from "./schema.d.ts";
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import logger from "lib/log/logger.ts";
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import { MINUTE } from "$std/datetime/constants.ts";
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import { redis } from "lib/db/redis.ts";
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import { Redis } from "ioredis";
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const WINDOW_SIZE = 2880;
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const REDIS_KEY = "cvsa:snapshot_window_counts";
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function getCurrentWindowIndex(): number {
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const now = new Date();
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const minutesSinceMidnight = now.getHours() * 60 + now.getMinutes();
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const currentWindow = Math.floor(minutesSinceMidnight / 5);
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return currentWindow;
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}
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export async function refreshSnapshotWindowCounts(client: Client, redisClient: Redis) {
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const now = new Date();
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const startTime = now.getTime();
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const result = await client.queryObject<{ window_start: Date; count: number }>`
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SELECT
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date_trunc('hour', started_at) +
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(EXTRACT(minute FROM started_at)::int / 5 * INTERVAL '5 minutes') AS window_start,
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COUNT(*) AS count
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FROM snapshot_schedule
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WHERE started_at >= NOW() AND status = 'pending' AND started_at <= NOW() + INTERVAL '10 days'
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GROUP BY 1
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ORDER BY window_start
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`
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await redisClient.del(REDIS_KEY);
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const currentWindow = getCurrentWindowIndex();
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for (const row of result.rows) {
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const targetOffset = Math.floor((row.window_start.getTime() - startTime) / (5 * MINUTE));
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const offset = (currentWindow + targetOffset);
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if (offset >= 0 && offset < WINDOW_SIZE) {
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await redisClient.hset(REDIS_KEY, offset.toString(), Number(row.count));
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}
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}
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}
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export async function initSnapshotWindowCounts(client: Client, redisClient: Redis) {
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await refreshSnapshotWindowCounts(client, redisClient);
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setInterval(async () => {
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await refreshSnapshotWindowCounts(client, redisClient);
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}, 5 * MINUTE);
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}
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async function getWindowCount(redisClient: Redis, offset: number): Promise<number> {
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const count = await redisClient.hget(REDIS_KEY, offset.toString());
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return count ? parseInt(count, 10) : 0;
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}
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async function updateWindowCount(redisClient: Redis, offset: number, increment: number): Promise<void> {
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await redisClient.hincrby(REDIS_KEY, offset.toString(), increment);
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}
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export async function snapshotScheduleExists(client: Client, id: number) {
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const res = await client.queryObject<{ id: number }>(
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`SELECT id FROM snapshot_schedule WHERE id = $1`,
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[id],
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);
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return res.rows.length > 0;
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}
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export async function videoHasActiveSchedule(client: Client, aid: number) {
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const res = await client.queryObject<{ status: string }>(
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`SELECT status FROM snapshot_schedule WHERE aid = $1 AND (status = 'pending' OR status = 'processing')`,
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[aid],
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);
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return res.rows.length > 0;
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}
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export async function videoHasProcessingSchedule(client: Client, aid: number) {
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const res = await client.queryObject<{ status: string }>(
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`SELECT status FROM snapshot_schedule WHERE aid = $1 AND status = 'processing'`,
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[aid],
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);
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return res.rows.length > 0;
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}
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interface Snapshot {
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created_at: number;
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views: number;
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}
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export async function findClosestSnapshot(
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client: Client,
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aid: number,
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targetTime: Date,
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): Promise<Snapshot | null> {
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const query = `
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SELECT created_at, views
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FROM video_snapshot
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WHERE aid = $1
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ORDER BY ABS(EXTRACT(EPOCH FROM (created_at - $2::timestamptz)))
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LIMIT 1
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`;
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const result = await client.queryObject<{ created_at: string; views: number }>(
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query,
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[aid, targetTime.toISOString()],
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);
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if (result.rows.length === 0) return null;
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const row = result.rows[0];
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return {
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created_at: new Date(row.created_at).getTime(),
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views: row.views,
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};
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}
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export async function findSnapshotBefore(
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client: Client,
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aid: number,
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targetTime: Date,
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): Promise<Snapshot | null> {
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const query = `
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SELECT created_at, views
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FROM video_snapshot
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WHERE aid = $1
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AND created_at <= $2::timestamptz
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ORDER BY created_at DESC
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LIMIT 1
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`;
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const result = await client.queryObject<{ created_at: string; views: number }>(
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query,
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[aid, targetTime.toISOString()],
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);
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if (result.rows.length === 0) return null;
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const row = result.rows[0];
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return {
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created_at: new Date(row.created_at).getTime(),
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views: row.views,
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};
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}
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export async function hasAtLeast2Snapshots(client: Client, aid: number) {
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const res = await client.queryObject<{ count: number }>(
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`SELECT COUNT(*) FROM video_snapshot WHERE aid = $1`,
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[aid],
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);
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return res.rows[0].count >= 2;
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}
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export async function getLatestSnapshot(client: Client, aid: number): Promise<Snapshot | null> {
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const res = await client.queryObject<{ created_at: string; views: number }>(
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`SELECT created_at, views FROM video_snapshot WHERE aid = $1 ORDER BY created_at DESC LIMIT 1`,
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[aid],
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);
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if (res.rows.length === 0) return null;
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const row = res.rows[0];
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return {
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created_at: new Date(row.created_at).getTime(),
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views: row.views,
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};
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}
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/*
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* Returns the number of snapshot schedules within the specified range.
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* @param client The database client.
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* @param start The start time of the range. (Timestamp in milliseconds)
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* @param end The end time of the range. (Timestamp in milliseconds)
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*/
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export async function getSnapshotScheduleCountWithinRange(client: Client, start: number, end: number) {
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const startTimeString = formatTimestampToPsql(start);
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const endTimeString = formatTimestampToPsql(end);
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const query = `
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SELECT COUNT(*) FROM snapshot_schedule
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WHERE started_at BETWEEN $1 AND $2
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AND status = 'pending'
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`;
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const res = await client.queryObject<{ count: number }>(query, [startTimeString, endTimeString]);
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return res.rows[0].count;
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}
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/*
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* Creates a new snapshot schedule record.
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* @param client The database client.
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* @param aid The aid of the video.
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* @param targetTime Scheduled time for snapshot. (Timestamp in milliseconds)
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*/
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export async function scheduleSnapshot(client: Client, aid: number, type: string, targetTime: number, force: boolean = false) {
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if (await videoHasActiveSchedule(client, aid) && !force) return;
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let adjustedTime = new Date(targetTime);
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if (type !== "milestone" && type !== "new") {
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adjustedTime = await adjustSnapshotTime(new Date(targetTime), 1000, redis);
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}
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logger.log(`Scheduled snapshot for ${aid} at ${adjustedTime.toISOString()}`, "mq", "fn:scheduleSnapshot");
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return client.queryObject(
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`INSERT INTO snapshot_schedule (aid, type, started_at) VALUES ($1, $2, $3)`,
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[aid, type, adjustedTime.toISOString()],
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);
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}
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export async function adjustSnapshotTime(
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expectedStartTime: Date,
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allowedCounts: number = 1000,
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redisClient: Redis,
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): Promise<Date> {
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const currentWindow = getCurrentWindowIndex();
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const targetOffset = Math.floor((expectedStartTime.getTime() - Date.now()) / (5 * MINUTE));
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let timePerIteration = 0;
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const t = performance.now();
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for (let i = 0; i < WINDOW_SIZE; i++) {
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const offset = (currentWindow + targetOffset + i) % WINDOW_SIZE;
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const count = await getWindowCount(redisClient, offset);
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if (count < allowedCounts) {
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await updateWindowCount(redisClient, offset, 1);
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const startPoint = new Date();
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startPoint.setHours(0, 0, 0, 0);
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const startTime = startPoint.getTime();
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const windowStart = startTime + offset * 5 * MINUTE;
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const randomDelay = Math.floor(Math.random() * 5 * MINUTE);
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const delayedDate = new Date(windowStart + randomDelay);
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const now = new Date();
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if (delayedDate.getTime() < now.getTime()) {
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const elapsed = performance.now() - t;
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timePerIteration = elapsed / (i+1);
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logger.log(`${timePerIteration.toFixed(3)}ms * ${i+1}iterations`, "perf", "fn:adjustSnapshotTime");
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return now;
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}
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const elapsed = performance.now() - t;
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timePerIteration = elapsed / (i+1);
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logger.log(`${timePerIteration.toFixed(3)}ms * ${i+1}iterations`, "perf", "fn:adjustSnapshotTime");
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return delayedDate;
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}
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}
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const elapsed = performance.now() - t;
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timePerIteration = elapsed / WINDOW_SIZE;
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logger.log(`${timePerIteration.toFixed(3)}ms * ${WINDOW_SIZE}iterations`, "perf", "fn:adjustSnapshotTime");
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return expectedStartTime;
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}
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export async function getSnapshotsInNextSecond(client: Client) {
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const query = `
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SELECT *
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FROM snapshot_schedule
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WHERE started_at <= NOW() + INTERVAL '1 seconds' AND status = 'pending'
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ORDER BY
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CASE
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WHEN type = 'milestone' THEN 0
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ELSE 1
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END,
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started_at
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LIMIT 10;
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`;
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const res = await client.queryObject<SnapshotScheduleType>(query, []);
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return res.rows;
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}
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export async function setSnapshotStatus(client: Client, id: number, status: string) {
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return await client.queryObject(
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`UPDATE snapshot_schedule SET status = $2 WHERE id = $1`,
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[id, status],
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);
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}
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export async function getVideosWithoutActiveSnapshotSchedule(client: Client) {
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const query: string = `
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SELECT s.aid
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FROM songs s
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LEFT JOIN snapshot_schedule ss ON s.aid = ss.aid AND (ss.status = 'pending' OR ss.status = 'processing')
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WHERE ss.aid IS NULL
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`;
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const res = await client.queryObject<{ aid: number }>(query, []);
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return res.rows.map((r) => Number(r.aid));
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}
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