mirror of
https://github.com/overleaf/overleaf.git
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84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/* eslint-disable
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camelcase,
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*/
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let EventLogger
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const logger = require('logger-sharelatex')
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const metrics = require('@overleaf/metrics')
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const settings = require('@overleaf/settings')
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// keep track of message counters to detect duplicate and out of order events
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// messsage ids have the format "UNIQUEHOSTKEY-COUNTER"
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const EVENT_LOG_COUNTER = {}
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const EVENT_LOG_TIMESTAMP = {}
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let EVENT_LAST_CLEAN_TIMESTAMP = 0
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// counter for debug logs
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let COUNTER = 0
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module.exports = EventLogger = {
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MAX_STALE_TIME_IN_MS: 3600 * 1000,
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debugEvent(channel, message) {
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if (settings.debugEvents > 0) {
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logger.info({ channel, message, counter: COUNTER++ }, 'logging event')
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settings.debugEvents--
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}
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},
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checkEventOrder(channel, message_id) {
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if (typeof message_id !== 'string') {
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return
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}
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let result
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if (!(result = message_id.match(/^(.*)-(\d+)$/))) {
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return
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}
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const key = result[1]
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const count = parseInt(result[2], 0)
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if (!(count >= 0)) {
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// ignore checks if counter is not present
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return
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}
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// store the last count in a hash for each host
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const previous = EventLogger._storeEventCount(key, count)
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if (!previous || count === previous + 1) {
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metrics.inc(`event.${channel}.valid`)
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return // order is ok
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}
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if (count === previous) {
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metrics.inc(`event.${channel}.duplicate`)
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logger.warn({ channel, message_id }, 'duplicate event')
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return 'duplicate'
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} else {
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metrics.inc(`event.${channel}.out-of-order`)
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logger.warn(
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{ channel, message_id, key, previous, count },
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'out of order event'
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)
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return 'out-of-order'
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}
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},
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_storeEventCount(key, count) {
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const previous = EVENT_LOG_COUNTER[key]
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const now = Date.now()
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EVENT_LOG_COUNTER[key] = count
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EVENT_LOG_TIMESTAMP[key] = now
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// periodically remove old counts
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if (now - EVENT_LAST_CLEAN_TIMESTAMP > EventLogger.MAX_STALE_TIME_IN_MS) {
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EventLogger._cleanEventStream(now)
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EVENT_LAST_CLEAN_TIMESTAMP = now
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}
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return previous
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},
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_cleanEventStream(now) {
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Object.entries(EVENT_LOG_TIMESTAMP).forEach(([key, timestamp]) => {
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if (now - timestamp > EventLogger.MAX_STALE_TIME_IN_MS) {
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delete EVENT_LOG_COUNTER[key]
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delete EVENT_LOG_TIMESTAMP[key]
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}
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})
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},
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}
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