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102 lines
5 KiB
CoffeeScript
102 lines
5 KiB
CoffeeScript
LockManager = require "./LockManager"
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RedisManager = require "./RedisManager"
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RealTimeRedisManager = require "./RealTimeRedisManager"
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ShareJsUpdateManager = require "./ShareJsUpdateManager"
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HistoryManager = require "./HistoryManager"
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Settings = require('settings-sharelatex')
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async = require("async")
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logger = require('logger-sharelatex')
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Metrics = require "./Metrics"
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Errors = require "./Errors"
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DocumentManager = require "./DocumentManager"
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RangesManager = require "./RangesManager"
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module.exports = UpdateManager =
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processOutstandingUpdates: (project_id, doc_id, callback = (error) ->) ->
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timer = new Metrics.Timer("updateManager.processOutstandingUpdates")
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UpdateManager.fetchAndApplyUpdates project_id, doc_id, (error) ->
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timer.done()
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return callback(error) if error?
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callback()
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processOutstandingUpdatesWithLock: (project_id, doc_id, callback = (error) ->) ->
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LockManager.tryLock doc_id, (error, gotLock, lockValue) =>
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return callback(error) if error?
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return callback() if !gotLock
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UpdateManager.processOutstandingUpdates project_id, doc_id, (error) ->
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return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
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LockManager.releaseLock doc_id, lockValue, (error) =>
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return callback(error) if error?
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UpdateManager.continueProcessingUpdatesWithLock project_id, doc_id, callback
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continueProcessingUpdatesWithLock: (project_id, doc_id, callback = (error) ->) ->
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RealTimeRedisManager.getUpdatesLength doc_id, (error, length) =>
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return callback(error) if error?
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if length > 0
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UpdateManager.processOutstandingUpdatesWithLock project_id, doc_id, callback
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else
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callback()
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fetchAndApplyUpdates: (project_id, doc_id, callback = (error) ->) ->
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RealTimeRedisManager.getPendingUpdatesForDoc doc_id, (error, updates) =>
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return callback(error) if error?
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if updates.length == 0
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return callback()
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async.eachSeries updates,
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(update, cb) -> UpdateManager.applyUpdate project_id, doc_id, update, cb
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callback
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applyUpdate: (project_id, doc_id, update, _callback = (error) ->) ->
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callback = (error) ->
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if error?
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RealTimeRedisManager.sendData {project_id, doc_id, error: error.message || error}
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_callback(error)
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UpdateManager._sanitizeUpdate update
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DocumentManager.getDoc project_id, doc_id, (error, lines, version, ranges) ->
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return callback(error) if error?
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if !lines? or !version?
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return callback(new Errors.NotFoundError("document not found: #{doc_id}"))
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ShareJsUpdateManager.applyUpdate project_id, doc_id, update, lines, version, (error, updatedDocLines, version, appliedOps) ->
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return callback(error) if error?
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RangesManager.applyUpdate project_id, doc_id, ranges, appliedOps, updatedDocLines, (error, new_ranges) ->
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return callback(error) if error?
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RedisManager.updateDocument doc_id, updatedDocLines, version, appliedOps, new_ranges, (error, historyOpsLength) ->
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return callback(error) if error?
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HistoryManager.recordAndFlushHistoryOps project_id, doc_id, appliedOps, historyOpsLength, callback
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lockUpdatesAndDo: (method, project_id, doc_id, args..., callback) ->
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LockManager.getLock doc_id, (error, lockValue) ->
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return callback(error) if error?
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UpdateManager.processOutstandingUpdates project_id, doc_id, (error) ->
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return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
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method project_id, doc_id, args..., (error, response_args...) ->
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return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
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LockManager.releaseLock doc_id, lockValue, (error) ->
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return callback(error) if error?
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callback null, response_args...
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# We held the lock for a while so updates might have queued up
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UpdateManager.continueProcessingUpdatesWithLock project_id, doc_id
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_handleErrorInsideLock: (doc_id, lockValue, original_error, callback = (error) ->) ->
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LockManager.releaseLock doc_id, lockValue, (lock_error) ->
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callback(original_error)
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_sanitizeUpdate: (update) ->
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# In Javascript, characters are 16-bits wide. It does not understand surrogates as characters.
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#
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# From Wikipedia (http://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane):
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# "The High Surrogates (U+D800–U+DBFF) and Low Surrogate (U+DC00–U+DFFF) codes are reserved
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# for encoding non-BMP characters in UTF-16 by using a pair of 16-bit codes: one High Surrogate
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# and one Low Surrogate. A single surrogate code point will never be assigned a character.""
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#
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# The main offender seems to be \uD835 as a stand alone character, which would be the first
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# 16-bit character of a blackboard bold character (http://www.fileformat.info/info/unicode/char/1d400/index.htm).
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# Something must be going on client side that is screwing up the encoding and splitting the
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# two 16-bit characters so that \uD835 is standalone.
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for op in update.op or []
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if op.i?
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# Replace high and low surrogate characters with 'replacement character' (\uFFFD)
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op.i = op.i.replace(/[\uD800-\uDFFF]/g, "\uFFFD")
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return update
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