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44 lines
1.6 KiB
CoffeeScript
44 lines
1.6 KiB
CoffeeScript
Settings = require('settings-sharelatex')
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rclient = require("redis-sharelatex").createClient(Settings.redis.documentupdater)
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pubsubClient = require("redis-sharelatex").createClient(Settings.redis.pubsub)
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Keys = Settings.redis.documentupdater.key_schema
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logger = require('logger-sharelatex')
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os = require "os"
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crypto = require "crypto"
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HOST = os.hostname()
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RND = crypto.randomBytes(4).toString('hex') # generate a random key for this process
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COUNT = 0
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MAX_OPS_PER_ITERATION = 8 # process a limited number of ops for safety
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module.exports = RealTimeRedisManager =
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getPendingUpdatesForDoc : (doc_id, callback)->
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multi = rclient.multi()
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multi.lrange Keys.pendingUpdates({doc_id}), 0, (MAX_OPS_PER_ITERATION-1)
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multi.ltrim Keys.pendingUpdates({doc_id}), MAX_OPS_PER_ITERATION, -1
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multi.exec (error, replys) ->
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return callback(error) if error?
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jsonUpdates = replys[0]
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updates = []
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for jsonUpdate in jsonUpdates
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try
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update = JSON.parse jsonUpdate
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catch e
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return callback e
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updates.push update
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callback error, updates
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getUpdatesLength: (doc_id, callback)->
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rclient.llen Keys.pendingUpdates({doc_id}), callback
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sendData: (data) ->
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# create a unique message id using a counter
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message_id = "doc:#{HOST}:#{RND}-#{COUNT++}"
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data?._id = message_id
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# publish on separate channels for individual projects and docs when
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# configured (needs realtime to be configured for this too).
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if Settings.publishOnIndividualChannels
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pubsubClient.publish "applied-ops:#{data.doc_id}", JSON.stringify(data)
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else
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pubsubClient.publish "applied-ops", JSON.stringify(data)
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