mirror of
https://github.com/overleaf/overleaf.git
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454 lines
15 KiB
CoffeeScript
454 lines
15 KiB
CoffeeScript
async = require "async"
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_ = require "underscore"
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{db, ObjectId} = require "./mongojs"
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BSON=db.bson.BSON
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logger = require "logger-sharelatex"
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LockManager = require "./LockManager"
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module.exports = PackManager =
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# The following functions implement methods like a mongo find, but
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# expands any documents containing a 'pack' field into multiple
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# values
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#
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# e.g. a single update looks like
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#
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# {
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# "doc_id" : 549dae9e0a2a615c0c7f0c98,
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# "project_id" : 549dae9c0a2a615c0c7f0c8c,
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# "op" : [ {"p" : 6981, "d" : "?" } ],
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# "meta" : { "user_id" : 52933..., "start_ts" : 1422310693931, "end_ts" : 1422310693931 },
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# "v" : 17082
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# }
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#
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# and a pack looks like this
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#
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# {
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# "doc_id" : 549dae9e0a2a615c0c7f0c98,
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# "project_id" : 549dae9c0a2a615c0c7f0c8c,
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# "pack" : [ U1, U2, U3, ...., UN],
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# "meta" : { "user_id" : 52933..., "start_ts" : 1422310693931, "end_ts" : 1422310693931 },
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# "v" : 17082
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# }
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#
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# where U1, U2, U3, .... are single updates stripped of their
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# doc_id and project_id fields (which are the same for all the
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# updates in the pack).
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#
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# The pack itself has v and meta fields, this makes it possible to
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# treat packs and single updates in the same way.
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#
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# The v field of the pack itself is from the first entry U1
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# The meta.end_ts field of the pack itself is from the last entry UN.
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findDocResults: (collection, query, limit, callback) ->
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# query - the mongo query selector, includes both the doc_id/project_id and
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# the range on v
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# limit - the mongo limit, we need to apply it after unpacking any
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# packs
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sort = {}
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sort['v'] = -1;
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cursor = collection
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.find( query )
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.sort( sort )
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# if we have packs, we will trim the results more later after expanding them
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if limit?
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cursor.limit(limit)
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# take the part of the query which selects the range over the parameter
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rangeQuery = query['v']
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# helper function to check if an item from a pack is inside the
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# desired range
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filterFn = (item) ->
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return false if rangeQuery?['$gte']? && item['v'] < rangeQuery['$gte']
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return false if rangeQuery?['$lte']? && item['v'] > rangeQuery['$lte']
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return false if rangeQuery?['$lt']? && item['v'] >= rangeQuery['$lt']
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return false if rangeQuery?['$gt']? && item['v'] <= rangeQuery['$gt']
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return true
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versionOrder = (a, b) ->
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b.v - a.v
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# create a query which can be used to select the entries BEFORE
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# the range because we sometimes need to find extra ones (when the
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# boundary falls in the middle of a pack)
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extraQuery = _.clone(query)
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# The pack uses its first entry for its metadata and v, so the
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# only queries where we might not get all the packs are those for
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# $gt and $gte (i.e. we need to find packs which start before our
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# range but end in it)
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if rangeQuery?['$gte']?
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extraQuery['v'] = {'$lt' : rangeQuery['$gte']}
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else if rangeQuery?['$gt']
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extraQuery['v'] = {'$lte' : rangeQuery['$gt']}
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else
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delete extraQuery['v']
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needMore = false # keep track of whether we need to load more data
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updates = [] # used to accumulate the set of results
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cursor.toArray (err, result) ->
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unpackedSet = PackManager._unpackResults(result)
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updates = PackManager._filterAndLimit(updates, unpackedSet, filterFn, limit)
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# check if we need to retrieve more data, because there is a
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# pack that crosses into our range
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last = if unpackedSet.length then unpackedSet[unpackedSet.length-1] else null
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if limit? && updates.length == limit
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needMore = false
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else if extraQuery['v']? && last? && filterFn(last)
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needMore = true
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else if extraQuery['v']? && updates.length == 0
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needMore = true
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if needMore
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# we do need an extra result set
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extra = collection
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.find(extraQuery)
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.sort(sort)
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.limit(1)
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extra.toArray (err, result2) ->
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if err?
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return callback err, updates.sort versionOrder
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else
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extraSet = PackManager._unpackResults(result2)
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updates = PackManager._filterAndLimit(updates, extraSet, filterFn, limit)
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callback err, updates.sort versionOrder
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return
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if err?
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callback err, result
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else
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callback err, updates.sort versionOrder
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findProjectResults: (collection, query, limit, callback) ->
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# query - the mongo query selector, includes both the doc_id/project_id and
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# the range on meta.end_ts
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# limit - the mongo limit, we need to apply it after unpacking any
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# packs
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sort = {}
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sort['meta.end_ts'] = -1;
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projection = {"op":false, "pack.op": false}
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cursor = collection
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.find( query, projection ) # no need to return the op only need version info
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.sort( sort )
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# if we have packs, we will trim the results more later after expanding them
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if limit?
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cursor.limit(limit)
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# take the part of the query which selects the range over the parameter
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before = query['meta.end_ts']?['$lt'] # may be null
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updates = [] # used to accumulate the set of results
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cursor.toArray (err, result) ->
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if err?
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return callback err, result
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if result.length == 0 && not before? # no results and no time range specified
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return callback err, result
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unpackedSet = PackManager._unpackResults(result)
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if limit?
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unpackedSet = unpackedSet.slice(0, limit)
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# find the end time of the last result, we will take all the
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# results up to this, and then all the changes at that time
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# (without imposing a limit) and any overlapping packs
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cutoff = if unpackedSet.length then unpackedSet[unpackedSet.length-1].meta.end_ts else null
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filterFn = (item) ->
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ts = item?.meta?.end_ts
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return false if before? && ts >= before
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return false if cutoff? && ts < cutoff
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return true
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timeOrder = (a, b) ->
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(b.meta.end_ts - a.meta.end_ts) || documentOrder(a, b)
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documentOrder = (a, b) ->
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x = a.doc_id.valueOf()
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y = b.doc_id.valueOf()
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if x > y then 1 else if x < y then -1 else 0
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updates = PackManager._filterAndLimit(updates, unpackedSet, filterFn, limit)
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# get all elements on the lower bound (cutoff)
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tailQuery = _.clone(query)
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tailQuery['meta.end_ts'] = cutoff
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tail = collection
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.find(tailQuery, projection)
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.sort(sort)
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# now find any packs that overlap with the time window
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overlapQuery = _.clone(query)
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if before? && cutoff?
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overlapQuery['meta.end_ts'] = {"$gte": before}
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overlapQuery['pack.0.meta.end_ts'] = {"$lte": before }
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else if before? && not cutoff?
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overlapQuery['meta.end_ts'] = {"$gte": before}
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overlapQuery['pack.0.meta.end_ts'] = {"$lte": before }
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else if not before? && cutoff?
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overlapQuery['meta.end_ts'] = {"$gte": cutoff}
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overlapQuery['pack.0.meta.end_ts'] = {"$gte": 0 }
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else if not before? && not cutoff?
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overlapQuery['meta.end_ts'] = {"$gte": 0 }
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overlapQuery['pack.0.meta.end_ts'] = {"$gte": 0 }
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overlap = collection
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.find(overlapQuery, projection)
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.sort(sort)
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# we don't specify a limit here, as there could be any number of overlaps
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# NB. need to catch items in original query and followup query for duplicates
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applyAndUpdate = (result) ->
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extraSet = PackManager._unpackResults(result)
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# note: final argument is null, no limit applied because we
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# need all the updates at the final time to avoid breaking
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# the changeset into parts
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updates = PackManager._filterAndLimit(updates, extraSet, filterFn, null)
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tail.toArray (err, result2) ->
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if err?
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return callback err, updates.sort timeOrder
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else
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applyAndUpdate result2
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overlap.toArray (err, result3) ->
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if err?
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return callback err, updates.sort timeOrder
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else
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applyAndUpdate result3
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callback err, updates.sort timeOrder
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_unpackResults: (updates) ->
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# iterate over the updates, if there's a pack, expand it into ops and
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# insert it into the array at that point
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result = []
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updates.forEach (item) ->
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if item.pack?
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all = PackManager._explodePackToOps item
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result = result.concat all
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else
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result.push item
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return result
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_explodePackToOps: (packObj) ->
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# convert a pack into an array of ops
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doc_id = packObj.doc_id
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project_id = packObj.project_id
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result = packObj.pack.map (item) ->
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item.doc_id = doc_id
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item.project_id = project_id
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item
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return result.reverse()
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_filterAndLimit: (results, extra, filterFn, limit) ->
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# update results with extra docs, after filtering and limiting
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filtered = extra.filter(filterFn)
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newResults = results.concat filtered
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# remove duplicates
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seen = {}
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newResults = newResults.filter (item) ->
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key = item.doc_id + ' ' + item.v
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if seen[key]
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return false
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else
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seen[key] = true
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return true
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newResults.slice(0, limit) if limit?
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return newResults
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MAX_SIZE: 1024*1024 # make these configurable parameters
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MAX_COUNT: 1024
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MIN_COUNT: 100
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KEEP_OPS: 100
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convertDocsToPacks: (docs, callback) ->
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packs = []
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top = null
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# keep the last KEEP_OPS as individual ops
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docs = docs.slice(0,-PackManager.KEEP_OPS)
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docs.forEach (d,i) ->
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# skip existing packs
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if d.pack?
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top = null
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return
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# skip temporary ops (we could pack these into temporary packs in future)
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if d.expiresAt?
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top = null
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return
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sz = BSON.calculateObjectSize(d)
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if top? && top.pack.length < PackManager.MAX_COUNT && top.sz + sz < PackManager.MAX_SIZE
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top.pack = top.pack.concat {v: d.v, meta: d.meta, op: d.op, _id: d._id}
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top.sz += sz
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top.v_end = d.v
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top.meta.end_ts = d.meta.end_ts
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return
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else if sz < PackManager.MAX_SIZE
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# create a new pack
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top = _.clone(d)
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top.pack = [ {v: d.v, meta: d.meta, op: d.op, _id: d._id} ]
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top.meta = { start_ts: d.meta.start_ts, end_ts: d.meta.end_ts }
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top.sz = sz
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delete top.op
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delete top._id
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packs.push top
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else
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# keep the op
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# util.log "keeping large op unchanged (#{sz} bytes)"
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# only store packs with a sufficient number of ops, discard others
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packs = packs.filter (packObj) ->
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packObj.pack.length > PackManager.MIN_COUNT
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callback(null, packs)
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checkHistory: (docs, callback) ->
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errors = []
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prev = null
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error = (args...) ->
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errors.push args
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docs.forEach (d,i) ->
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if d.pack?
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n = d.pack.length
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last = d.pack[n-1]
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error('bad pack v_end', d) if d.v_end != last.v
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error('bad pack start_ts', d) if d.meta.start_ts != d.pack[0].meta.start_ts
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error('bad pack end_ts', d) if d.meta.end_ts != last.meta.end_ts
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d.pack.forEach (p, i) ->
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prev = v
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v = p.v
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error('bad version', v, 'in', p) if v <= prev
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#error('expired op', p, 'in pack') if p.expiresAt?
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else
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prev = v
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v = d.v
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error('bad version', v, 'in', d) if v <= prev
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if errors.length
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callback(errors)
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else
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callback()
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insertPack: (packObj, callback) ->
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bulk = db.docHistory.initializeOrderedBulkOp()
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doc_id = packObj.doc_id
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expect_nInserted = 1
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expect_nRemoved = packObj.pack.length
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logger.log {doc_id: doc_id}, "adding pack, removing #{expect_nRemoved} ops"
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bulk.insert packObj
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packObj.pack.forEach (op) ->
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bulk.find({_id:op._id}).removeOne()
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bulk.execute (err, result) ->
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if err?
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logger.error {doc_id: doc_id}, "error adding pack"
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callback(err, result)
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else if result.nInserted != expect_nInserted or result.nRemoved != expect_nRemoved
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logger.error {doc_id: doc_id, result}, "unexpected result adding pack"
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callback(new Error(
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msg: 'unexpected result'
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expected: {expect_nInserted, expect_nRemoved}
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), result)
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else
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db.docHistoryStats.update {doc_id:doc_id}, {
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$inc:{update_count:-expect_nRemoved},
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$currentDate:{last_packed:true}
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}, {upsert:true}, () ->
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callback(err, result)
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# retrieve document ops/packs and check them
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getDocHistory: (doc_id, callback) ->
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db.docHistory.find({doc_id:ObjectId(doc_id)}).sort {v:1}, (err, docs) ->
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return callback(err) if err?
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# for safety, do a consistency check of the history
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logger.log {doc_id}, "checking history for document"
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PackManager.checkHistory docs, (err) ->
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return callback(err) if err?
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callback(err, docs)
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#PackManager.deleteExpiredPackOps docs, (err) ->
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# return callback(err) if err?
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# callback err, docs
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packDocHistory: (doc_id, options, callback) ->
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if typeof callback == "undefined" and typeof options == 'function'
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callback = options
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options = {}
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LockManager.runWithLock(
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"HistoryLock:#{doc_id}",
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(releaseLock) ->
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PackManager._packDocHistory(doc_id, options, releaseLock)
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, callback
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)
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_packDocHistory: (doc_id, options, callback) ->
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logger.log {doc_id},"starting pack operation for document history"
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PackManager.getDocHistory doc_id, (err, docs) ->
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return callback(err) if err?
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origDocs = 0
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origPacks = 0
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for d in docs
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if d.pack? then origPacks++ else origDocs++
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PackManager.convertDocsToPacks docs, (err, packs) ->
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return callback(err) if err?
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total = 0
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for p in packs
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total = total + p.pack.length
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logger.log {doc_id, origDocs, origPacks, newPacks: packs.length, totalOps: total}, "document stats"
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if packs.length
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if options['dry-run']
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logger.log {doc_id}, 'dry-run, skipping write packs'
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return callback()
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PackManager.savePacks packs, (err) ->
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return callback(err) if err?
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# check the history again
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PackManager.getDocHistory doc_id, callback
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else
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logger.log {doc_id}, "no packs to write"
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# keep a record that we checked this one to avoid rechecking it
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db.docHistoryStats.update {doc_id:doc_id}, {
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$currentDate:{last_checked:true}
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}, {upsert:true}, () ->
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callback null, null
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DB_WRITE_DELAY: 2000
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savePacks: (packs, callback) ->
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async.eachSeries packs, PackManager.safeInsert, (err, result) ->
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if err?
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logger.log {err, result}, "error writing packs"
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callback err, result
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else
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callback()
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safeInsert: (packObj, callback) ->
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PackManager.insertPack packObj, (err, result) ->
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setTimeout () ->
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callback(err,result)
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, PackManager.DB_WRITE_DELAY
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deleteExpiredPackOps: (docs, callback) ->
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now = Date.now()
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toRemove = []
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toUpdate = []
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docs.forEach (d,i) ->
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if d.pack?
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newPack = d.pack.filter (op) ->
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if op.expiresAt? then op.expiresAt > now else true
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if newPack.length == 0
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toRemove.push d
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else if newPack.length < d.pack.length
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# adjust the pack properties
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d.pack = newPack
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first = d.pack[0]
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last = d.pack[d.pack.length - 1]
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d.v_end = last.v
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d.meta.start_ts = first.meta.start_ts
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d.meta.end_ts = last.meta.end_ts
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toUpdate.push d
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if toRemove.length or toUpdate.length
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bulk = db.docHistory.initializeOrderedBulkOp()
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toRemove.forEach (pack) ->
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console.log "would remove", pack
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#bulk.find({_id:pack._id}).removeOne()
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toUpdate.forEach (pack) ->
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console.log "would update", pack
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#bulk.find({_id:pack._id}).updateOne(pack);
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bulk.execute callback
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else
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callback()
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