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54 lines
1.6 KiB
CoffeeScript
54 lines
1.6 KiB
CoffeeScript
Settings = require "settings-sharelatex"
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redis = require('redis')
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redisConf = Settings.redis?.web or {host: "localhost", port: 6379}
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rclient = redis.createClient(redisConf.port, redisConf.host)
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rclient.auth(redisConf.password)
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module.exports = LockManager =
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LOCK_TEST_INTERVAL: 50 # 50ms between each test of the lock
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MAX_LOCK_WAIT_TIME: 10000 # 10s maximum time to spend trying to get the lock
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LOCK_TTL: 10 # seconds
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tryLock : (key, callback = (err, gotLock) ->) ->
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rclient.set key, "locked", "EX", @LOCK_TTL, "NX", (err, gotLock)->
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return callback(err) if err?
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if gotLock == "OK"
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callback err, true
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else
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callback err, false
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getLock: (key, callback = (error) ->) ->
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startTime = Date.now()
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do attempt = () ->
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if Date.now() - startTime > LockManager.MAX_LOCK_WAIT_TIME
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return callback(new Error("Timeout"))
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LockManager.tryLock key, (error, gotLock) ->
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return callback(error) if error?
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if gotLock
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callback(null)
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else
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setTimeout attempt, LockManager.LOCK_TEST_INTERVAL
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checkLock: (key, callback = (err, isFree) ->) ->
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rclient.exists key, (err, exists) ->
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return callback(err) if err?
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exists = parseInt exists
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if exists == 1
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callback err, false
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else
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callback err, true
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releaseLock: (key, callback) ->
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rclient.del key, callback
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runWithLock: (key, runner = ( (releaseLock = (error) ->) -> ), callback = ( (error) -> )) ->
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LockManager.getLock key, (error) ->
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return callback(error) if error?
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runner (error1) ->
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LockManager.releaseLock key, (error2) ->
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error = error1 or error2
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return callback(error) if error?
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callback()
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