overleaf/services/track-changes/app/coffee/RedisManager.coffee
2017-04-24 14:23:32 +01:00

32 lines
1.3 KiB
CoffeeScript

Settings = require "settings-sharelatex"
redis = require("redis-sharelatex")
rclient = redis.createClient(Settings.redis.history)
Keys = Settings.redis.history.key_schema
module.exports = RedisManager =
getOldestDocUpdates: (doc_id, batchSize, callback = (error, jsonUpdates) ->) ->
key = Keys.uncompressedHistoryOps({doc_id})
rclient.lrange key, 0, batchSize - 1, callback
expandDocUpdates: (jsonUpdates, callback = (error, rawUpdates) ->) ->
try
rawUpdates = ( JSON.parse(update) for update in jsonUpdates or [] )
catch e
return callback(e)
callback null, rawUpdates
deleteAppliedDocUpdates: (project_id, doc_id, docUpdates, callback = (error) ->) ->
multi = rclient.multi()
# Delete all the updates which have been applied (exact match)
for update in docUpdates or []
multi.lrem Keys.uncompressedHistoryOps({doc_id}), 0, update
# It's ok to delete the doc_id from the set here. Even though the list
# of updates may not be empty, we will continue to process it until it is.
multi.srem Keys.docsWithHistoryOps({project_id}), doc_id
multi.exec (error, results) ->
return callback(error) if error?
callback null
getDocIdsWithHistoryOps: (project_id, callback = (error, doc_ids) ->) ->
rclient.smembers Keys.docsWithHistoryOps({project_id}), callback