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65 lines
2.2 KiB
CoffeeScript
65 lines
2.2 KiB
CoffeeScript
ShareJsModel = require "./sharejs/server/model"
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ShareJsDB = require "./ShareJsDB"
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async = require "async"
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logger = require "logger-sharelatex"
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Settings = require('settings-sharelatex')
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Keys = require "./RedisKeyBuilder"
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{EventEmitter} = require "events"
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util = require "util"
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redis = require('redis')
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redisConf = Settings.redis.web
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rclient = redis.createClient(redisConf.port, redisConf.host)
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rclient.auth(redisConf.password)
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ShareJsModel:: = {}
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util.inherits ShareJsModel, EventEmitter
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module.exports = ShareJsUpdateManager =
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getNewShareJsModel: () -> new ShareJsModel(ShareJsDB)
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applyUpdates: (project_id, doc_id, updates, callback = (error, updatedDocLines) ->) ->
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logger.log project_id: project_id, doc_id: doc_id, updates: updates, "applying sharejs updates"
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jobs = []
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# We could use a global model for all docs, but we're hitting issues with the
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# internal state of ShareJS not being accessible for clearing caches, and
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# getting stuck due to queued callbacks (line 260 of sharejs/server/model.coffee)
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# This adds a small but hopefully acceptable overhead (~12ms per 1000 updates on
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# my 2009 MBP).
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model = @getNewShareJsModel()
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@_listenForOps(model)
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doc_key = Keys.combineProjectIdAndDocId(project_id, doc_id)
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for update in updates
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do (update) =>
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jobs.push (callback) =>
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model.applyOp doc_key, update, callback
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async.series jobs, (error) =>
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logger.log project_id: project_id, doc_id: doc_id, error: error, "applied updates"
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if error?
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@_sendError(project_id, doc_id, error)
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return callback(error)
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model.getSnapshot doc_key, (error, data) =>
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if error?
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@_sendError(project_id, doc_id, error)
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return callback(error)
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docLines = data.snapshot.split(/\r\n|\n|\r/)
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callback(null, docLines, data.v)
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_listenForOps: (model) ->
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model.on "applyOp", (doc_key, opData) ->
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[project_id, doc_id] = Keys.splitProjectIdAndDocId(doc_key)
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data = JSON.stringify
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project_id: project_id
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doc_id: doc_id
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op: opData
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rclient.publish "applied-ops", data
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_sendError: (project_id, doc_id, error) ->
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data = JSON.stringify
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project_id: project_id
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doc_id: doc_id
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error: error.message || error
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rclient.publish "applied-ops", data
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