513 lines
14 KiB
TypeScript
513 lines
14 KiB
TypeScript
import { getSafeJson } from '@openpanel/json';
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import {
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type Redis,
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getRedisCache,
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publishEvent,
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} from '@openpanel/redis';
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import { ch } from '../clickhouse/client';
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import {
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type IClickhouseEvent,
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type IServiceEvent,
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transformEvent,
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} from '../services/event.service';
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import { BaseBuffer } from './base-buffer';
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/**
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* Event Buffer
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*
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* 1. All events go into a single list buffer (event_buffer:queue)
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* 2. screen_view events are handled specially:
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* - Store current screen_view as "last" for the session
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* - When a new screen_view arrives, flush the previous one with calculated duration
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* 3. session_end events:
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* - Retrieve the last screen_view (don't modify it)
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* - Push both screen_view and session_end to buffer
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* 4. Flush: Process all events from the list buffer
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*/
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interface PendingEvent {
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event: IClickhouseEvent;
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eventJson: string;
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eventWithTimestamp?: string;
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type: 'regular' | 'screen_view' | 'session_end';
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}
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export class EventBuffer extends BaseBuffer {
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private batchSize = process.env.EVENT_BUFFER_BATCH_SIZE
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? Number.parseInt(process.env.EVENT_BUFFER_BATCH_SIZE, 10)
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: 4000;
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private chunkSize = process.env.EVENT_BUFFER_CHUNK_SIZE
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? Number.parseInt(process.env.EVENT_BUFFER_CHUNK_SIZE, 10)
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: 1000;
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private microBatchIntervalMs = process.env.EVENT_BUFFER_MICRO_BATCH_MS
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? Number.parseInt(process.env.EVENT_BUFFER_MICRO_BATCH_MS, 10)
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: 10;
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private microBatchMaxSize = process.env.EVENT_BUFFER_MICRO_BATCH_SIZE
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? Number.parseInt(process.env.EVENT_BUFFER_MICRO_BATCH_SIZE, 10)
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: 100;
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private pendingEvents: PendingEvent[] = [];
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private flushTimer: ReturnType<typeof setTimeout> | null = null;
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private isFlushing = false;
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/** Tracks consecutive flush failures for observability; reset on success. */
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private flushRetryCount = 0;
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private activeVisitorsExpiration = 60 * 5; // 5 minutes
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/** How often (ms) we refresh the heartbeat key + zadd per visitor. */
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private heartbeatRefreshMs = 60_000; // 1 minute
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private lastHeartbeat = new Map<string, number>();
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private queueKey = 'event_buffer:queue';
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protected bufferCounterKey = 'event_buffer:total_count';
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private scriptShas: {
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addScreenView?: string;
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addSessionEnd?: string;
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} = {};
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private getLastScreenViewKeyBySession(sessionId: string) {
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return `event_buffer:last_screen_view:session:${sessionId}`;
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}
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private getLastScreenViewKeyByProfile(projectId: string, profileId: string) {
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return `event_buffer:last_screen_view:profile:${projectId}:${profileId}`;
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}
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/**
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* Lua script for screen_view addition.
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* Uses GETDEL for atomic get-and-delete to prevent race conditions.
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*
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* KEYS[1] = last screen_view key (by session)
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* KEYS[2] = last screen_view key (by profile, may be empty)
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* KEYS[3] = queue key
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* KEYS[4] = buffer counter key
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* ARGV[1] = new event with timestamp as JSON: {"event": {...}, "ts": 123456}
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* ARGV[2] = TTL for last screen_view (1 hour)
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*/
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private readonly addScreenViewScript = `
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local sessionKey = KEYS[1]
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local profileKey = KEYS[2]
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local queueKey = KEYS[3]
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local counterKey = KEYS[4]
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local newEventData = ARGV[1]
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local ttl = tonumber(ARGV[2])
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local previousEventData = redis.call("GETDEL", sessionKey)
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redis.call("SET", sessionKey, newEventData, "EX", ttl)
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if profileKey and profileKey ~= "" then
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redis.call("SET", profileKey, newEventData, "EX", ttl)
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end
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if previousEventData then
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local prev = cjson.decode(previousEventData)
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local curr = cjson.decode(newEventData)
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if prev.ts and curr.ts then
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prev.event.duration = math.max(0, curr.ts - prev.ts)
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end
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redis.call("RPUSH", queueKey, cjson.encode(prev.event))
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redis.call("INCR", counterKey)
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return 1
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end
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return 0
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`;
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/**
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* Lua script for session_end.
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* Uses GETDEL to atomically retrieve and delete the last screen_view.
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*
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* KEYS[1] = last screen_view key (by session)
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* KEYS[2] = last screen_view key (by profile, may be empty)
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* KEYS[3] = queue key
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* KEYS[4] = buffer counter key
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* ARGV[1] = session_end event JSON
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*/
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private readonly addSessionEndScript = `
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local sessionKey = KEYS[1]
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local profileKey = KEYS[2]
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local queueKey = KEYS[3]
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local counterKey = KEYS[4]
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local sessionEndJson = ARGV[1]
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local previousEventData = redis.call("GETDEL", sessionKey)
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local added = 0
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if previousEventData then
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local prev = cjson.decode(previousEventData)
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redis.call("RPUSH", queueKey, cjson.encode(prev.event))
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redis.call("INCR", counterKey)
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added = added + 1
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end
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redis.call("RPUSH", queueKey, sessionEndJson)
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redis.call("INCR", counterKey)
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added = added + 1
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if profileKey and profileKey ~= "" then
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redis.call("DEL", profileKey)
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end
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return added
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`;
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constructor() {
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super({
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name: 'event',
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onFlush: async () => {
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await this.processBuffer();
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},
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});
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this.loadScripts();
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}
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private async loadScripts() {
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try {
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const redis = getRedisCache();
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const [screenViewSha, sessionEndSha] = await Promise.all([
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redis.script('LOAD', this.addScreenViewScript),
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redis.script('LOAD', this.addSessionEndScript),
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]);
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this.scriptShas.addScreenView = screenViewSha as string;
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this.scriptShas.addSessionEnd = sessionEndSha as string;
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this.logger.info('Loaded Lua scripts into Redis', {
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addScreenView: this.scriptShas.addScreenView,
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addSessionEnd: this.scriptShas.addSessionEnd,
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});
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} catch (error) {
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this.logger.error('Failed to load Lua scripts', { error });
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}
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}
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bulkAdd(events: IClickhouseEvent[]) {
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for (const event of events) {
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this.add(event);
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}
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}
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add(event: IClickhouseEvent) {
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const eventJson = JSON.stringify(event);
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let type: PendingEvent['type'] = 'regular';
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let eventWithTimestamp: string | undefined;
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if (event.session_id && event.name === 'screen_view') {
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type = 'screen_view';
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const timestamp = new Date(event.created_at || Date.now()).getTime();
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eventWithTimestamp = JSON.stringify({
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event: event,
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ts: timestamp,
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});
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} else if (event.session_id && event.name === 'session_end') {
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type = 'session_end';
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}
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const pendingEvent: PendingEvent = {
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event,
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eventJson,
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eventWithTimestamp,
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type,
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};
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this.pendingEvents.push(pendingEvent);
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if (this.pendingEvents.length >= this.microBatchMaxSize) {
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this.flushLocalBuffer();
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return;
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}
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if (!this.flushTimer) {
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this.flushTimer = setTimeout(() => {
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this.flushTimer = null;
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this.flushLocalBuffer();
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}, this.microBatchIntervalMs);
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}
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}
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private addToMulti(multi: ReturnType<Redis['multi']>, pending: PendingEvent) {
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const { event, eventJson, eventWithTimestamp, type } = pending;
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if (type === 'screen_view' && event.session_id) {
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const sessionKey = this.getLastScreenViewKeyBySession(event.session_id);
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const profileKey = event.profile_id
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? this.getLastScreenViewKeyByProfile(event.project_id, event.profile_id)
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: '';
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this.evalScript(
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multi,
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'addScreenView',
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this.addScreenViewScript,
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4,
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sessionKey,
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profileKey,
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this.queueKey,
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this.bufferCounterKey,
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eventWithTimestamp!,
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'3600',
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);
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} else if (type === 'session_end' && event.session_id) {
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const sessionKey = this.getLastScreenViewKeyBySession(event.session_id);
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const profileKey = event.profile_id
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? this.getLastScreenViewKeyByProfile(event.project_id, event.profile_id)
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: '';
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this.evalScript(
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multi,
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'addSessionEnd',
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this.addSessionEndScript,
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4,
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sessionKey,
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profileKey,
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this.queueKey,
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this.bufferCounterKey,
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eventJson,
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);
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} else {
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multi.rpush(this.queueKey, eventJson).incr(this.bufferCounterKey);
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}
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if (event.profile_id) {
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this.incrementActiveVisitorCount(
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multi,
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event.project_id,
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event.profile_id,
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);
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}
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}
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public async flush() {
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if (this.flushTimer) {
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clearTimeout(this.flushTimer);
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this.flushTimer = null;
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}
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await this.flushLocalBuffer();
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}
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private async flushLocalBuffer() {
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if (this.isFlushing || this.pendingEvents.length === 0) {
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return;
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}
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this.isFlushing = true;
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const eventsToFlush = this.pendingEvents;
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this.pendingEvents = [];
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try {
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const redis = getRedisCache();
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const multi = redis.multi();
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for (const pending of eventsToFlush) {
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this.addToMulti(multi, pending);
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}
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await multi.exec();
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this.flushRetryCount = 0;
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this.pruneHeartbeatMap();
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} catch (error) {
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// Re-queue failed events at the front to preserve order and avoid data loss
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this.pendingEvents = eventsToFlush.concat(this.pendingEvents);
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this.flushRetryCount += 1;
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this.logger.warn('Failed to flush local buffer to Redis; events re-queued', {
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error,
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eventCount: eventsToFlush.length,
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flushRetryCount: this.flushRetryCount,
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});
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} finally {
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this.isFlushing = false;
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// Events may have accumulated while we were flushing; schedule another flush if needed
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if (this.pendingEvents.length > 0 && !this.flushTimer) {
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this.flushTimer = setTimeout(() => {
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this.flushTimer = null;
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this.flushLocalBuffer();
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}, this.microBatchIntervalMs);
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}
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}
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}
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private evalScript(
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multi: ReturnType<Redis['multi']>,
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scriptName: keyof typeof this.scriptShas,
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scriptContent: string,
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numKeys: number,
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...args: (string | number)[]
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) {
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const sha = this.scriptShas[scriptName];
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if (sha) {
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multi.evalsha(sha, numKeys, ...args);
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} else {
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multi.eval(scriptContent, numKeys, ...args);
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this.logger.warn(`Script ${scriptName} not loaded, using EVAL fallback`);
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this.loadScripts();
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}
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}
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async processBuffer() {
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const redis = getRedisCache();
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try {
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const queueEvents = await redis.lrange(
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this.queueKey,
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0,
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this.batchSize - 1,
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);
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if (queueEvents.length === 0) {
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this.logger.debug('No events to process');
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return;
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}
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const eventsToClickhouse: IClickhouseEvent[] = [];
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for (const eventStr of queueEvents) {
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const event = getSafeJson<IClickhouseEvent>(eventStr);
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if (event) {
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eventsToClickhouse.push(event);
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}
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}
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if (eventsToClickhouse.length === 0) {
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this.logger.debug('No valid events to process');
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return;
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}
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eventsToClickhouse.sort(
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(a, b) =>
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new Date(a.created_at || 0).getTime() -
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new Date(b.created_at || 0).getTime(),
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);
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this.logger.info('Inserting events into ClickHouse', {
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totalEvents: eventsToClickhouse.length,
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chunks: Math.ceil(eventsToClickhouse.length / this.chunkSize),
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});
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for (const chunk of this.chunks(eventsToClickhouse, this.chunkSize)) {
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await ch.insert({
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table: 'events',
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values: chunk,
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format: 'JSONEachRow',
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});
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}
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const countByProject = new Map<string, number>();
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for (const event of eventsToClickhouse) {
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countByProject.set(event.project_id, (countByProject.get(event.project_id) ?? 0) + 1);
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}
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for (const [projectId, count] of countByProject) {
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publishEvent('events', 'batch', { projectId, count });
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}
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await redis
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.multi()
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.ltrim(this.queueKey, queueEvents.length, -1)
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.decrby(this.bufferCounterKey, queueEvents.length)
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.exec();
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this.logger.info('Processed events from Redis buffer', {
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batchSize: this.batchSize,
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eventsProcessed: eventsToClickhouse.length,
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});
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} catch (error) {
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this.logger.error('Error processing Redis buffer', { error });
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}
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}
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public async getLastScreenView(
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params:
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| {
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sessionId: string;
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}
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| {
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projectId: string;
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profileId: string;
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},
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): Promise<IServiceEvent | null> {
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const redis = getRedisCache();
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let lastScreenViewKey: string;
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if ('sessionId' in params) {
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lastScreenViewKey = this.getLastScreenViewKeyBySession(params.sessionId);
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} else {
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lastScreenViewKey = this.getLastScreenViewKeyByProfile(
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params.projectId,
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params.profileId,
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);
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}
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const eventDataStr = await redis.get(lastScreenViewKey);
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if (eventDataStr) {
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const eventData = getSafeJson<{ event: IClickhouseEvent; ts: number }>(
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eventDataStr,
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);
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if (eventData?.event) {
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return transformEvent(eventData.event);
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}
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}
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return null;
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}
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public async getBufferSize() {
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return this.getBufferSizeWithCounter(async () => {
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const redis = getRedisCache();
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return await redis.llen(this.queueKey);
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});
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}
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private pruneHeartbeatMap() {
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const cutoff = Date.now() - this.activeVisitorsExpiration * 1000;
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for (const [key, ts] of this.lastHeartbeat) {
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if (ts < cutoff) {
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this.lastHeartbeat.delete(key);
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}
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}
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}
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private incrementActiveVisitorCount(
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multi: ReturnType<Redis['multi']>,
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projectId: string,
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profileId: string,
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) {
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const key = `${projectId}:${profileId}`;
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const now = Date.now();
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const last = this.lastHeartbeat.get(key) ?? 0;
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if (now - last < this.heartbeatRefreshMs) {
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return;
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}
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this.lastHeartbeat.set(key, now);
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const zsetKey = `live:visitors:${projectId}`;
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const heartbeatKey = `live:visitor:${projectId}:${profileId}`;
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multi
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.zadd(zsetKey, now, profileId)
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.set(heartbeatKey, '1', 'EX', this.activeVisitorsExpiration);
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}
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public async getActiveVisitorCount(projectId: string): Promise<number> {
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const redis = getRedisCache();
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const zsetKey = `live:visitors:${projectId}`;
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const cutoff = Date.now() - this.activeVisitorsExpiration * 1000;
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const multi = redis.multi();
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multi
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.zremrangebyscore(zsetKey, '-inf', cutoff)
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.zcount(zsetKey, cutoff, '+inf');
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const [, count] = (await multi.exec()) as [
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[Error | null, any],
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[Error | null, number],
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];
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return count[1] || 0;
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}
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}
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