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79 lines
3.9 KiB
CoffeeScript
79 lines
3.9 KiB
CoffeeScript
Settings = require('settings-sharelatex')
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RedisManager = require "./RedisManager"
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ProjectManager = require "./ProjectManager"
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logger = require "logger-sharelatex"
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metrics = require "./Metrics"
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async = require "async"
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# Maintain a sorted set of project flushAndDelete requests, ordered by timestamp
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# (ZADD), and process them from oldest to newest. A flushAndDelete request comes
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# from real-time and is triggered when a user leaves a project.
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#
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# The aim is to remove the project from redis 5 minutes after the last request
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# if there has been no activity (document updates) in that time. If there is
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# activity we can expect a further flushAndDelete request when the editing user
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# leaves the project.
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#
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# If a new flushAndDelete request comes in while an existing request is already
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# in the queue we update the timestamp as we can postpone flushing further.
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#
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# Documents are processed by checking the queue, seeing if the first entry is
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# older than 5 minutes, and popping it from the queue in that case.
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module.exports = DeleteQueueManager =
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flushAndDeleteOldProjects: (options, callback) ->
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startTime = Date.now()
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cutoffTime = startTime - options.min_delete_age + 100 * (Math.random() - 0.5)
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count = 0
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flushProjectIfNotModified = (project_id, flushTimestamp, cb) ->
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ProjectManager.getProjectDocsTimestamps project_id, (err, timestamps) ->
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return callback(err) if err?
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if timestamps.length == 0
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logger.log {project_id}, "skipping flush of queued project - no timestamps"
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return cb()
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# are any of the timestamps newer than the time the project was flushed?
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for timestamp in timestamps when timestamp > flushTimestamp
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metrics.inc "queued-delete-skipped"
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logger.debug {project_id, timestamps, flushTimestamp}, "found newer timestamp, will skip delete"
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return cb()
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logger.log {project_id, flushTimestamp}, "flushing queued project"
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ProjectManager.flushAndDeleteProjectWithLocks project_id, {skip_history_flush: false}, (err) ->
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if err?
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logger.err {project_id, err}, "error flushing queued project"
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metrics.inc "queued-delete-completed"
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return cb(null, true)
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flushNextProject = () ->
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now = Date.now()
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if now - startTime > options.timeout
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logger.log "hit time limit on flushing old projects"
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return callback(null, count)
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if count > options.limit
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logger.log "hit count limit on flushing old projects"
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return callback(null, count)
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RedisManager.getNextProjectToFlushAndDelete cutoffTime, (err, project_id, flushTimestamp, queueLength) ->
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return callback(err) if err?
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return callback(null, count) if !project_id?
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logger.log {project_id, queueLength: queueLength}, "flushing queued project"
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metrics.globalGauge "queued-flush-backlog", queueLength
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flushProjectIfNotModified project_id, flushTimestamp, (err, flushed) ->
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count++ if flushed
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flushNextProject()
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flushNextProject()
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startBackgroundFlush: () ->
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SHORT_DELAY = 10
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LONG_DELAY = 1000
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doFlush = () ->
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if Settings.shuttingDown
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logger.warn "discontinuing background flush due to shutdown"
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return
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DeleteQueueManager.flushAndDeleteOldProjects {
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timeout:1000,
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min_delete_age:3*60*1000,
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limit:1000 # high value, to ensure we always flush enough projects
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}, (err, flushed) ->
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setTimeout doFlush, (if flushed > 10 then SHORT_DELAY else LONG_DELAY)
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doFlush()
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