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61 lines
2.5 KiB
CoffeeScript
61 lines
2.5 KiB
CoffeeScript
MongoManager = require "./MongoManager"
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RedisManager = require "./RedisManager"
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UpdateCompressor = require "./UpdateCompressor"
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LockManager = require "./LockManager"
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logger = require "logger-sharelatex"
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module.exports = HistoryManager =
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compressAndSaveRawUpdates: (doc_id, rawUpdates, callback = (error) ->) ->
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length = rawUpdates.length
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if length == 0
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return callback()
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MongoManager.popLastCompressedUpdate doc_id, (error, lastCompressedUpdate) ->
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return callback(error) if error?
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logger.log doc_id: doc_id, "popped last update"
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# Ensure that raw updates start where lastCompressedUpdate left off
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if lastCompressedUpdate?
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rawUpdates = rawUpdates.slice(0)
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while rawUpdates[0]? and rawUpdates[0].v <= lastCompressedUpdate.v
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rawUpdates.shift()
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if rawUpdates[0]? and rawUpdates[0].v != lastCompressedUpdate.v + 1
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return callback new Error("Tried to apply raw op at version #{rawUpdates[0].v} to last compressed update with version #{lastCompressedUpdate.v}")
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compressedUpdates = UpdateCompressor.compressRawUpdates lastCompressedUpdate, rawUpdates
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MongoManager.insertCompressedUpdates doc_id, compressedUpdates, (error) ->
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return callback(error) if error?
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logger.log doc_id: doc_id, rawUpdatesLength: length, compressedUpdatesLength: compressedUpdates.length, "compressed doc updates"
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callback()
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REDIS_READ_BATCH_SIZE: 100
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processUncompressedUpdates: (doc_id, callback = (error) ->) ->
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logger.log "processUncompressedUpdates"
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RedisManager.getOldestRawUpdates doc_id, HistoryManager.REDIS_READ_BATCH_SIZE, (error, rawUpdates) ->
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return callback(error) if error?
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length = rawUpdates.length
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logger.log doc_id: doc_id, length: length, "got raw updates from redis"
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HistoryManager.compressAndSaveRawUpdates doc_id, rawUpdates, (error) ->
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return callback(error) if error?
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logger.log doc_id: doc_id, "compressed and saved doc updates"
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RedisManager.deleteOldestRawUpdates doc_id, length, (error) ->
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return callback(error) if error?
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if length == HistoryManager.REDIS_READ_BATCH_SIZE
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# There might be more updates
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logger.log doc_id: doc_id, "continuing processing updates"
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setTimeout () ->
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HistoryManager.processUncompressedUpdates doc_id, callback
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, 0
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else
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logger.log doc_id: doc_id, "all raw updates processed"
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callback()
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processUncompressedUpdatesWithLock: (doc_id, callback = (error) ->) ->
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LockManager.runWithLock(
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"HistoryLock:#{doc_id}",
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(releaseLock) ->
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HistoryManager.processUncompressedUpdates doc_id, releaseLock
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callback
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)
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