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Add Redis Manager for fetching and deleting uncompressed ops
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services/track-changes/app/coffee/RedisManager.coffee
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21
services/track-changes/app/coffee/RedisManager.coffee
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Settings = require "settings-sharelatex"
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redis = require('redis')
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redisConf = Settings.redis?.web or {host: "localhost", port: 6379}
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rclient = redis.createClient(redisConf.port, redisConf.host)
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rclient.auth(redisConf.password)
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buildRawUpdatesKey = (doc_id) -> "UncompressedHistoryOps:#{doc_id}"
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module.exports = RedisManager =
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getOldestRawUpdates: (doc_id, batchSize, callback = (error, rawUpdates) ->) ->
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key = buildRawUpdatesKey(doc_id)
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rclient.lrange key, 0, batchSize - 1, (error, jsonUpdates) ->
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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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deleteOldestRawUpdates: (doc_id, batchSize, callback = (error, rawUpdates) ->) ->
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key = buildRawUpdatesKey(doc_id)
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rclient.ltrim key, batchSize, -1, callback
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sinon = require('sinon')
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chai = require('chai')
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should = chai.should()
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expect = chai.expect
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modulePath = "../../../../app/js/RedisManager.js"
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SandboxedModule = require('sandboxed-module')
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describe "RedisManager", ->
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beforeEach ->
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@RedisManager = SandboxedModule.require modulePath, requires:
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"redis" :
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createClient: () => @rclient =
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auth: sinon.stub()
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"settings-sharelatex": {}
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@doc_id = "doc-id-123"
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@batchSize = 100
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@callback = sinon.stub()
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describe "getOldestRawUpdates", ->
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beforeEach ->
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@rawUpdates = [ {v: 42, op: "mock-op-42"}, { v: 45, op: "mock-op-45" }]
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@jsonUpdates = (JSON.stringify(update) for update in @rawUpdates)
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@rclient.lrange = sinon.stub().callsArgWith(3, null, @jsonUpdates)
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@RedisManager.getOldestRawUpdates @doc_id, @batchSize, @callback
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it "should read the updates from redis", ->
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@rclient.lrange
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.calledWith("UncompressedHistoryOps:#{@doc_id}", 0, @batchSize - 1)
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.should.equal true
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it "should call the callback with the parsed ops", ->
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@callback.calledWith(null, @rawUpdates).should.equal true
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describe "deleteOldestRawUpdates", ->
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beforeEach ->
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@rclient.ltrim = sinon.stub().callsArg(3)
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@RedisManager.deleteOldestRawUpdates @doc_id, @batchSize, @callback
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it "should delete the updates from redis", ->
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@rclient.ltrim
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.calledWith("UncompressedHistoryOps:#{@doc_id}", @batchSize, -1)
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.should.equal true
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it "should call the callback", ->
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@callback.called.should.equal true
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