overleaf/services/document-updater/app/coffee/RealTimeRedisManager.coffee

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Settings = require('settings-sharelatex')
rclient = require("redis-sharelatex").createClient(Settings.redis.realtime)
Keys = Settings.redis.realtime.key_schema
logger = require('logger-sharelatex')
MAX_OPS_PER_ITERATION = 8 # process a limited number of ops for safety
module.exports = RealTimeRedisManager =
getPendingUpdatesForDoc : (doc_id, callback)->
multi = rclient.multi()
multi.lrange Keys.pendingUpdates({doc_id}), 0, (MAX_OPS_PER_ITERATION-1)
multi.ltrim Keys.pendingUpdates({doc_id}), MAX_OPS_PER_ITERATION, -1
multi.exec (error, replys) ->
return callback(error) if error?
jsonUpdates = replys[0]
updates = []
for jsonUpdate in jsonUpdates
try
update = JSON.parse jsonUpdate
catch e
return callback e
updates.push update
callback error, updates
getUpdatesLength: (doc_id, callback)->
rclient.llen Keys.pendingUpdates({doc_id}), callback
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sendData: (data) ->
rclient.publish "applied-ops", JSON.stringify(data)