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

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LockManager = require "./LockManager"
RedisManager = require "./RedisManager"
RealTimeRedisManager = require "./RealTimeRedisManager"
ShareJsUpdateManager = require "./ShareJsUpdateManager"
HistoryManager = require "./HistoryManager"
Settings = require('settings-sharelatex')
_ = require("underscore")
async = require("async")
logger = require('logger-sharelatex')
Metrics = require "./Metrics"
Errors = require "./Errors"
DocumentManager = require "./DocumentManager"
RangesManager = require "./RangesManager"
Profiler = require "./Profiler"
module.exports = UpdateManager =
processOutstandingUpdates: (project_id, doc_id, callback = (error) ->) ->
timer = new Metrics.Timer("updateManager.processOutstandingUpdates")
UpdateManager.fetchAndApplyUpdates project_id, doc_id, (error) ->
timer.done()
return callback(error) if error?
callback()
processOutstandingUpdatesWithLock: (project_id, doc_id, callback = (error) ->) ->
profile = new Profiler("processOutstandingUpdatesWithLock", {project_id, doc_id})
LockManager.tryLock doc_id, (error, gotLock, lockValue) =>
return callback(error) if error?
return callback() if !gotLock
profile.log("tryLock")
UpdateManager.processOutstandingUpdates project_id, doc_id, (error) ->
return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
profile.log("processOutstandingUpdates")
LockManager.releaseLock doc_id, lockValue, (error) =>
return callback(error) if error?
profile.log("releaseLock").end()
UpdateManager.continueProcessingUpdatesWithLock project_id, doc_id, callback
continueProcessingUpdatesWithLock: (project_id, doc_id, callback = (error) ->) ->
RealTimeRedisManager.getUpdatesLength doc_id, (error, length) =>
return callback(error) if error?
if length > 0
UpdateManager.processOutstandingUpdatesWithLock project_id, doc_id, callback
else
callback()
fetchAndApplyUpdates: (project_id, doc_id, callback = (error) ->) ->
profile = new Profiler("fetchAndApplyUpdates", {project_id, doc_id})
RealTimeRedisManager.getPendingUpdatesForDoc doc_id, (error, updates) =>
return callback(error) if error?
logger.info {project_id: project_id, doc_id: doc_id, count: updates.length}, "processing updates"
if updates.length == 0
return callback()
profile.log("getPendingUpdatesForDoc")
doUpdate = (update, cb)->
UpdateManager.applyUpdate project_id, doc_id, update, (err) ->
profile.log("applyUpdate")
cb(err)
finalCallback = (err) ->
profile.log("async done").end()
callback(err)
async.eachSeries updates, doUpdate, finalCallback
applyUpdate: (project_id, doc_id, update, _callback = (error) ->) ->
callback = (error) ->
if error?
RealTimeRedisManager.sendData {project_id, doc_id, error: error.message || error}
profile.log("sendData")
profile.end()
_callback(error)
profile = new Profiler("applyUpdate", {project_id, doc_id})
UpdateManager._sanitizeUpdate update
profile.log("sanitizeUpdate")
DocumentManager.getDoc project_id, doc_id, (error, lines, version, ranges, pathname, projectHistoryId) ->
profile.log("getDoc")
return callback(error) if error?
if !lines? or !version?
return callback(new Errors.NotFoundError("document not found: #{doc_id}"))
ShareJsUpdateManager.applyUpdate project_id, doc_id, update, lines, version, (error, updatedDocLines, version, appliedOps) ->
profile.log("sharejs.applyUpdate")
return callback(error) if error?
RangesManager.applyUpdate project_id, doc_id, ranges, appliedOps, updatedDocLines, (error, new_ranges) ->
UpdateManager._addProjectHistoryMetadataToOps(appliedOps, pathname, projectHistoryId, lines)
profile.log("RangesManager.applyUpdate")
return callback(error) if error?
RedisManager.updateDocument project_id, doc_id, updatedDocLines, version, appliedOps, new_ranges, (error, doc_ops_length, project_ops_length) ->
profile.log("RedisManager.updateDocument")
return callback(error) if error?
HistoryManager.recordAndFlushHistoryOps project_id, doc_id, appliedOps, doc_ops_length, project_ops_length, (error) ->
profile.log("recordAndFlushHistoryOps")
callback(error)
lockUpdatesAndDo: (method, project_id, doc_id, args..., callback) ->
profile = new Profiler("lockUpdatesAndDo", {project_id, doc_id})
LockManager.getLock doc_id, (error, lockValue) ->
profile.log("getLock")
return callback(error) if error?
UpdateManager.processOutstandingUpdates project_id, doc_id, (error) ->
return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
profile.log("processOutstandingUpdates")
method project_id, doc_id, args..., (error, response_args...) ->
return UpdateManager._handleErrorInsideLock(doc_id, lockValue, error, callback) if error?
profile.log("method")
LockManager.releaseLock doc_id, lockValue, (error) ->
return callback(error) if error?
profile.log("releaseLock").end()
callback null, response_args...
# We held the lock for a while so updates might have queued up
UpdateManager.continueProcessingUpdatesWithLock project_id, doc_id
_handleErrorInsideLock: (doc_id, lockValue, original_error, callback = (error) ->) ->
LockManager.releaseLock doc_id, lockValue, (lock_error) ->
callback(original_error)
_sanitizeUpdate: (update) ->
# In Javascript, characters are 16-bits wide. It does not understand surrogates as characters.
#
# From Wikipedia (http://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane):
# "The High Surrogates (U+D800U+DBFF) and Low Surrogate (U+DC00U+DFFF) codes are reserved
# for encoding non-BMP characters in UTF-16 by using a pair of 16-bit codes: one High Surrogate
# and one Low Surrogate. A single surrogate code point will never be assigned a character.""
#
# The main offender seems to be \uD835 as a stand alone character, which would be the first
# 16-bit character of a blackboard bold character (http://www.fileformat.info/info/unicode/char/1d400/index.htm).
# Something must be going on client side that is screwing up the encoding and splitting the
# two 16-bit characters so that \uD835 is standalone.
for op in update.op or []
if op.i?
# Replace high and low surrogate characters with 'replacement character' (\uFFFD)
op.i = op.i.replace(/[\uD800-\uDFFF]/g, "\uFFFD")
return update
_addProjectHistoryMetadataToOps: (updates, pathname, projectHistoryId, lines) ->
doc_length = _.reduce lines,
(chars, line) -> chars + line.length,
0
doc_length += lines.length - 1 # count newline characters
updates.forEach (update) ->
update.projectHistoryId = projectHistoryId
update.meta ||= {}
update.meta.pathname = pathname
update.meta.doc_length = doc_length
# Each update may contain multiple ops, i.e.
# [{
# ops: [{i: "foo", p: 4}, {d: "bar", p:8}]
# }, {
# ops: [{d: "baz", p: 40}, {i: "qux", p:8}]
# }]
# We want to include the doc_length at the start of each update,
# before it's ops are applied. However, we need to track any
# changes to it for the next update.
for op in update.op
if op.i?
doc_length += op.i.length
if op.d?
doc_length -= op.d.length