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65 lines
1.7 KiB
CoffeeScript
65 lines
1.7 KiB
CoffeeScript
ASpellWorker = require "./ASpellWorker"
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_ = require "underscore"
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logger = require 'logger-sharelatex'
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metrics = require('metrics-sharelatex')
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class ASpellWorkerPool
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MAX_REQUESTS: 100*1024
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MAX_WORKERS: 32
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constructor: (@options) ->
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@PROCESS_POOL = []
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@timeout = 1000
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create: (language) ->
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if @PROCESS_POOL.length >= @MAX_WORKERS
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logger.log maxworkers: @MAX_WORKERS, "maximum number of workers already running"
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return null
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worker = new ASpellWorker(language, @options)
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worker.pipe.on 'exit', () =>
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@cleanup()
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@PROCESS_POOL.push(worker)
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metrics.gauge 'aspellWorkerPool-size', @PROCESS_POOL.length
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return worker
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cleanup: () ->
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active = @PROCESS_POOL.filter (worker) ->
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worker.state != 'killed'
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@PROCESS_POOL = active
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metrics.gauge 'aspellWorkerPool-size', @PROCESS_POOL.length
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check: (language, words, timeout, callback) ->
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# look for an existing process in the pool
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availableWorker = _.find @PROCESS_POOL, (cached) ->
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cached.language == language && cached.isReady()
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if not availableWorker?
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worker = @create(language)
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else
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worker = availableWorker
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if not worker?
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# return error if too many workers
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callback(new Error("no worker available"))
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return
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if worker.idleTimer?
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clearTimeout worker.idleTimer
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worker.idleTimer = null
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killTimer = setTimeout () ->
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worker.pipe.kill('SIGKILL')
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, timeout || 1000
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worker.check words, (err, output) =>
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clearTimeout killTimer
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callback(err, output)
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# queue a shutdown if worker is not used
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if worker.count > @MAX_REQUESTS
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worker.shutdown("reached limit of " + @MAX_REQUESTS + " requests")
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else
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worker.idleTimer = setTimeout () ->
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worker.shutdown("idle worker")
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worker.idleTimer = null
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, 1000
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module.exports = ASpellWorkerPool
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