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72 lines
2.8 KiB
CoffeeScript
72 lines
2.8 KiB
CoffeeScript
Settings = require "settings-sharelatex"
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redis = require("redis-sharelatex")
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rclient = redis.createClient(Settings.redis.web)
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rawUpdatesKey = (doc_id) -> "UncompressedHistoryOps:#{doc_id}"
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docsWithHistoryOpsKey = (project_id) -> "DocsWithHistoryOps:#{project_id}"
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module.exports = RedisManager =
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getOldestDocUpdates: (doc_id, batchSize, callback = (error, jsonUpdates) ->) ->
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key = rawUpdatesKey(doc_id)
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rclient.lrange key, 0, batchSize - 1, callback
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expandDocUpdates: (jsonUpdates, callback = (error, rawUpdates) ->) ->
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try
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rawUpdates = ( JSON.parse(update) for update in jsonUpdates or [] )
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catch e
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return callback(e)
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callback null, rawUpdates
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deleteAppliedDocUpdates: (project_id, doc_id, docUpdates, callback = (error) ->) ->
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multi = rclient.multi()
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# Delete all the updates which have been applied (exact match)
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for update in docUpdates or []
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multi.lrem rawUpdatesKey(doc_id), 0, update
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# It's ok to delete the doc_id from the set here. Even though the list
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# of updates may not be empty, we will continue to process it until it is.
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multi.srem docsWithHistoryOpsKey(project_id), doc_id
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multi.exec (error, results) ->
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return callback(error) if error?
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callback null
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getDocIdsWithHistoryOps: (project_id, callback = (error, doc_ids) ->) ->
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rclient.smembers docsWithHistoryOpsKey(project_id), callback
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# iterate over keys asynchronously using redis scan (non-blocking)
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_getKeys: (pattern, callback) ->
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cursor = 0 # redis iterator
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keySet = {} # use hash to avoid duplicate results
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# scan over all keys looking for pattern
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doIteration = (cb) ->
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rclient.scan cursor, "MATCH", pattern, "COUNT", 1000, (error, reply) ->
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return callback(error) if error?
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[cursor, keys] = reply
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for key in keys
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keySet[key] = true
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if cursor == '0' # note redis returns string result not numeric
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return callback(null, Object.keys(keySet))
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else
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doIteration()
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doIteration()
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# extract ids from keys like DocsWithHistoryOps:57fd0b1f53a8396d22b2c24b
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_extractIds: (keyList) ->
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ids = (key.split(":")[1] for key in keyList)
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return ids
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# this will only work on single node redis, not redis cluster
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getProjectIdsWithHistoryOps: (callback = (error, project_ids) ->) ->
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RedisManager._getKeys docsWithHistoryOpsKey("*"), (error, project_keys) ->
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return callback(error) if error?
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project_ids = RedisManager._extractIds project_keys
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callback(error, project_ids)
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# this will only work on single node redis, not redis cluster
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getAllDocIdsWithHistoryOps: (callback = (error, doc_ids) ->) ->
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# return all the docids, to find dangling history entries after
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# everything is flushed.
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RedisManager._getKeys rawUpdatesKey("*"), (error, doc_keys) ->
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return callback(error) if error?
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doc_ids = RedisManager._extractIds doc_keys
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callback(error, doc_ids)
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