Merge pull request #24 from sharelatex/bg-support-project-version

support project version
This commit is contained in:
Brian Gough 2018-03-20 11:29:04 +00:00 committed by GitHub
commit dffc0a42c3
7 changed files with 169 additions and 70 deletions

View file

@ -161,10 +161,10 @@ module.exports = HttpController =
updateProject: (req, res, next = (error) ->) ->
timer = new Metrics.Timer("http.updateProject")
project_id = req.params.project_id
{userId, docUpdates, fileUpdates} = req.body
logger.log {project_id, docUpdates, fileUpdates}, "updating project via http"
{userId, docUpdates, fileUpdates, version} = req.body
logger.log {project_id, docUpdates, fileUpdates, version}, "updating project via http"
ProjectManager.updateProjectWithLocks project_id, userId, docUpdates, fileUpdates, (error) ->
ProjectManager.updateProjectWithLocks project_id, userId, docUpdates, fileUpdates, version, (error) ->
timer.done()
return next(error) if error?
logger.log project_id: project_id, "updated project via http"

View file

@ -7,47 +7,49 @@ module.exports = ProjectHistoryRedisManager =
queueOps: (project_id, ops..., callback) ->
rclient.rpush projectHistoryKeys.projectHistoryOps({project_id}), ops..., callback
queueRenameEntity: (project_id, entity_type, entity_id, user_id, update, callback) ->
update =
pathname: update.pathname
new_pathname: update.newPathname
queueRenameEntity: (project_id, entity_type, entity_id, user_id, projectUpdate, callback) ->
projectUpdate =
pathname: projectUpdate.pathname
new_pathname: projectUpdate.newPathname
meta:
user_id: user_id
ts: new Date()
update[entity_type] = entity_id
version: projectUpdate.version
projectUpdate[entity_type] = entity_id
logger.log {project_id, update}, "queue rename operation to project-history"
jsonUpdate = JSON.stringify(update)
logger.log {project_id, projectUpdate}, "queue rename operation to project-history"
jsonUpdate = JSON.stringify(projectUpdate)
ProjectHistoryRedisManager.queueOps project_id, jsonUpdate, callback
queueAddEntity: (project_id, entity_type, entitiy_id, user_id, update, callback = (error) ->) ->
update =
pathname: update.pathname
docLines: update.docLines
url: update.url
queueAddEntity: (project_id, entity_type, entitiy_id, user_id, projectUpdate, callback = (error) ->) ->
projectUpdate =
pathname: projectUpdate.pathname
docLines: projectUpdate.docLines
url: projectUpdate.url
meta:
user_id: user_id
ts: new Date()
update[entity_type] = entitiy_id
version: projectUpdate.version
projectUpdate[entity_type] = entitiy_id
logger.log {project_id, update}, "queue add operation to project-history"
jsonUpdate = JSON.stringify(update)
logger.log {project_id, projectUpdate}, "queue add operation to project-history"
jsonUpdate = JSON.stringify(projectUpdate)
ProjectHistoryRedisManager.queueOps project_id, jsonUpdate, callback
queueResyncProjectStructure: (project_id, docs, files, callback) ->
logger.log {project_id, docs, files}, "queue project structure resync"
update =
projectUpdate =
resyncProjectStructure: { docs, files }
meta:
ts: new Date()
jsonUpdate = JSON.stringify update
jsonUpdate = JSON.stringify projectUpdate
ProjectHistoryRedisManager.queueOps project_id, jsonUpdate, callback
queueResyncDocContent: (project_id, doc_id, lines, version, pathname, callback) ->
logger.log {project_id, doc_id, lines, version, pathname}, "queue doc content resync"
update =
projectUpdate =
resyncDocContent:
content: lines.join("\n"),
version: version
@ -55,5 +57,5 @@ module.exports = ProjectHistoryRedisManager =
doc: doc_id
meta:
ts: new Date()
jsonUpdate = JSON.stringify update
jsonUpdate = JSON.stringify projectUpdate
ProjectHistoryRedisManager.queueOps project_id, jsonUpdate, callback

View file

@ -105,39 +105,44 @@ module.exports = ProjectManager =
clearProjectState: (project_id, callback = (error) ->) ->
RedisManager.clearProjectState project_id, callback
updateProjectWithLocks: (project_id, user_id, docUpdates, fileUpdates, _callback = (error) ->) ->
updateProjectWithLocks: (project_id, user_id, docUpdates, fileUpdates, version, _callback = (error) ->) ->
timer = new Metrics.Timer("projectManager.updateProject")
callback = (args...) ->
timer.done()
_callback(args...)
project_version = version
project_subversion = 0 # project versions can have multiple operations
project_ops_length = 0
handleDocUpdate = (update, cb) ->
doc_id = update.id
if update.docLines?
ProjectHistoryRedisManager.queueAddEntity project_id, 'doc', doc_id, user_id, update, (error, count) ->
handleDocUpdate = (projectUpdate, cb) ->
doc_id = projectUpdate.id
projectUpdate.version = "#{project_version}.#{project_subversion++}"
if projectUpdate.docLines?
ProjectHistoryRedisManager.queueAddEntity project_id, 'doc', doc_id, user_id, projectUpdate, (error, count) ->
project_ops_length = count
cb(error)
else
DocumentManager.renameDocWithLock project_id, doc_id, user_id, update, (error, count) ->
DocumentManager.renameDocWithLock project_id, doc_id, user_id, projectUpdate, (error, count) ->
project_ops_length = count
cb(error)
handleFileUpdate = (update, cb) ->
file_id = update.id
if update.url?
ProjectHistoryRedisManager.queueAddEntity project_id, 'file', file_id, user_id, update, (error, count) ->
handleFileUpdate = (projectUpdate, cb) ->
file_id = projectUpdate.id
projectUpdate.version = "#{project_version}.#{project_subversion++}"
if projectUpdate.url?
ProjectHistoryRedisManager.queueAddEntity project_id, 'file', file_id, user_id, projectUpdate, (error, count) ->
project_ops_length = count
cb(error)
else
ProjectHistoryRedisManager.queueRenameEntity project_id, 'file', file_id, user_id, update, (error, count) ->
ProjectHistoryRedisManager.queueRenameEntity project_id, 'file', file_id, user_id, projectUpdate, (error, count) ->
project_ops_length = count
cb(error)
async.each docUpdates, handleDocUpdate, (error) ->
async.eachSeries docUpdates, handleDocUpdate, (error) ->
return callback(error) if error?
async.each fileUpdates, handleFileUpdate, (error) ->
async.eachSeries fileUpdates, handleFileUpdate, (error) ->
return callback(error) if error?
if HistoryManager.shouldFlushHistoryOps(project_ops_length, docUpdates.length + fileUpdates.length, HistoryManager.FLUSH_PROJECT_EVERY_N_OPS)
HistoryManager.flushProjectChangesAsync project_id

View file

@ -13,6 +13,7 @@ DocUpdaterApp = require "./helpers/DocUpdaterApp"
describe "Applying updates to a project's structure", ->
before ->
@user_id = 'user-id-123'
@version = 1234
describe "renaming a file", ->
before (done) ->
@ -24,7 +25,7 @@ describe "Applying updates to a project's structure", ->
@fileUpdates = [ @fileUpdate ]
DocUpdaterApp.ensureRunning (error) =>
throw error if error?
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, [], @fileUpdates, (error) ->
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, [], @fileUpdates, @version, (error) ->
throw error if error?
setTimeout done, 200
@ -38,6 +39,7 @@ describe "Applying updates to a project's structure", ->
update.new_pathname.should.equal '/new-file-path'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
done()
@ -52,7 +54,7 @@ describe "Applying updates to a project's structure", ->
describe "when the document is not loaded", ->
before (done) ->
@project_id = DocUpdaterClient.randomId()
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], (error) ->
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], @version, (error) ->
throw error if error?
setTimeout done, 200
@ -66,6 +68,7 @@ describe "Applying updates to a project's structure", ->
update.new_pathname.should.equal '/new-doc-path'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
done()
@ -76,7 +79,7 @@ describe "Applying updates to a project's structure", ->
DocUpdaterClient.preloadDoc @project_id, @docUpdate.id, (error) =>
throw error if error?
sinon.spy MockWebApi, "getDocument"
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], (error) ->
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], @version, (error) ->
throw error if error?
setTimeout done, 200
@ -98,9 +101,77 @@ describe "Applying updates to a project's structure", ->
update.new_pathname.should.equal '/new-doc-path'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
done()
describe "renaming multiple documents and files", ->
before ->
@docUpdate0 =
id: DocUpdaterClient.randomId()
pathname: '/doc-path0'
newPathname: '/new-doc-path0'
@docUpdate1 =
id: DocUpdaterClient.randomId()
pathname: '/doc-path1'
newPathname: '/new-doc-path1'
@docUpdates = [ @docUpdate0, @docUpdate1 ]
@fileUpdate0 =
id: DocUpdaterClient.randomId()
pathname: '/file-path0'
newPathname: '/new-file-path0'
@fileUpdate1 =
id: DocUpdaterClient.randomId()
pathname: '/file-path1'
newPathname: '/new-file-path1'
@fileUpdates = [ @fileUpdate0, @fileUpdate1 ]
describe "when the documents are not loaded", ->
before (done) ->
@project_id = DocUpdaterClient.randomId()
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, @fileUpdates, @version, (error) ->
throw error if error?
setTimeout done, 200
it "should push the applied doc renames to the project history api", (done) ->
rclient_history.lrange ProjectHistoryKeys.projectHistoryOps({@project_id}), 0, -1, (error, updates) =>
throw error if error?
update = JSON.parse(updates[0])
update.doc.should.equal @docUpdate0.id
update.pathname.should.equal '/doc-path0'
update.new_pathname.should.equal '/new-doc-path0'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
update = JSON.parse(updates[1])
update.doc.should.equal @docUpdate1.id
update.pathname.should.equal '/doc-path1'
update.new_pathname.should.equal '/new-doc-path1'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.1"
update = JSON.parse(updates[2])
update.file.should.equal @fileUpdate0.id
update.pathname.should.equal '/file-path0'
update.new_pathname.should.equal '/new-file-path0'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.2"
update = JSON.parse(updates[3])
update.file.should.equal @fileUpdate1.id
update.pathname.should.equal '/file-path1'
update.new_pathname.should.equal '/new-file-path1'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.3"
done()
describe "adding a file", ->
before (done) ->
@project_id = DocUpdaterClient.randomId()
@ -109,7 +180,7 @@ describe "Applying updates to a project's structure", ->
pathname: '/file-path'
url: 'filestore.example.com'
@fileUpdates = [ @fileUpdate ]
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, [], @fileUpdates, (error) ->
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, [], @fileUpdates, @version, (error) ->
throw error if error?
setTimeout done, 200
@ -123,6 +194,7 @@ describe "Applying updates to a project's structure", ->
update.url.should.equal 'filestore.example.com'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
done()
@ -134,7 +206,7 @@ describe "Applying updates to a project's structure", ->
pathname: '/file-path'
docLines: 'a\nb'
@docUpdates = [ @docUpdate ]
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], (error) ->
DocUpdaterClient.sendProjectUpdate @project_id, @user_id, @docUpdates, [], @version, (error) ->
throw error if error?
setTimeout done, 200
@ -148,6 +220,7 @@ describe "Applying updates to a project's structure", ->
update.docLines.should.equal 'a\nb'
update.meta.user_id.should.equal @user_id
update.meta.ts.should.be.a('string')
update.version.should.equal "#{@version}.0"
done()
@ -155,7 +228,8 @@ describe "Applying updates to a project's structure", ->
before (done) ->
@project_id = DocUpdaterClient.randomId()
@user_id = DocUpdaterClient.randomId()
@version0 = 12345
@version1 = @version0 + 1
updates = []
for v in [0..599] # Should flush after 500 ops
updates.push
@ -168,9 +242,9 @@ describe "Applying updates to a project's structure", ->
# Send updates in chunks to causes multiple flushes
projectId = @project_id
userId = @project_id
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(0, 250), [], (error) ->
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(0, 250), [], @version0, (error) ->
throw error if error?
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(250), [], (error) ->
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(250), [], @version1, (error) ->
throw error if error?
setTimeout done, 2000
@ -184,6 +258,8 @@ describe "Applying updates to a project's structure", ->
before (done) ->
@project_id = DocUpdaterClient.randomId()
@user_id = DocUpdaterClient.randomId()
@version0 = 12345
@version1 = @version0 + 1
updates = []
for v in [0..42] # Should flush after 500 ops
@ -197,9 +273,9 @@ describe "Applying updates to a project's structure", ->
# Send updates in chunks
projectId = @project_id
userId = @project_id
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(0, 10), [], (error) ->
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(0, 10), [], @version0, (error) ->
throw error if error?
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(10), [], (error) ->
DocUpdaterClient.sendProjectUpdate projectId, userId, updates.slice(10), [], @version1, (error) ->
throw error if error?
setTimeout done, 2000

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@ -87,9 +87,9 @@ module.exports = DocUpdaterClient =
body = JSON.parse(body)
callback error, res, body
sendProjectUpdate: (project_id, userId, docUpdates, fileUpdates, callback = (error) ->) ->
sendProjectUpdate: (project_id, userId, docUpdates, fileUpdates, version, callback = (error) ->) ->
request.post {
url: "http://localhost:3003/project/#{project_id}"
json: { userId, docUpdates, fileUpdates }
json: { userId, docUpdates, fileUpdates, version }
}, (error, res, body) ->
callback error, res, body

View file

@ -512,19 +512,20 @@ describe "HttpController", ->
@userId = "user-id-123"
@docUpdates = sinon.stub()
@fileUpdates = sinon.stub()
@version = 1234567
@req =
body: {@userId, @docUpdates, @fileUpdates}
body: {@userId, @docUpdates, @fileUpdates, @version}
params:
project_id: @project_id
describe "successfully", ->
beforeEach ->
@ProjectManager.updateProjectWithLocks = sinon.stub().callsArgWith(4)
@ProjectManager.updateProjectWithLocks = sinon.stub().callsArgWith(5)
@HttpController.updateProject(@req, @res, @next)
it "should accept the change", ->
@ProjectManager.updateProjectWithLocks
.calledWith(@project_id, @userId, @docUpdates, @fileUpdates)
.calledWith(@project_id, @userId, @docUpdates, @fileUpdates, @version)
.should.equal true
it "should return a successful No Content response", ->
@ -537,7 +538,7 @@ describe "HttpController", ->
describe "when an errors occurs", ->
beforeEach ->
@ProjectManager.updateProjectWithLocks = sinon.stub().callsArgWith(4, new Error("oops"))
@ProjectManager.updateProjectWithLocks = sinon.stub().callsArgWith(5, new Error("oops"))
@HttpController.updateProject(@req, @res, @next)
it "should call next with the error", ->

View file

@ -3,6 +3,7 @@ chai = require('chai')
should = chai.should()
modulePath = "../../../../app/js/ProjectManager.js"
SandboxedModule = require('sandboxed-module')
_ = require('underscore')
describe "ProjectManager", ->
beforeEach ->
@ -18,6 +19,7 @@ describe "ProjectManager", ->
@project_id = "project-id-123"
@user_id = "user-id-123"
@version = 1234567
@HistoryManager.shouldFlushHistoryOps = sinon.stub().returns(false)
@HistoryManager.flushProjectChangesAsync = sinon.stub()
@callback = sinon.stub()
@ -45,19 +47,22 @@ describe "ProjectManager", ->
describe "successfully", ->
beforeEach ->
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should rename the docs in the updates", ->
firstDocUpdateWithVersion = _.extend({}, @firstDocUpdate, {version: "#{@version}.0"})
secondDocUpdateWithVersion = _.extend({}, @secondDocUpdate, {version: "#{@version}.1"})
@DocumentManager.renameDocWithLock
.calledWith(@project_id, @firstDocUpdate.id, @user_id, @firstDocUpdate)
.calledWith(@project_id, @firstDocUpdate.id, @user_id, firstDocUpdateWithVersion)
.should.equal true
@DocumentManager.renameDocWithLock
.calledWith(@project_id, @secondDocUpdate.id, @user_id, @secondDocUpdate)
.calledWith(@project_id, @secondDocUpdate.id, @user_id, secondDocUpdateWithVersion)
.should.equal true
it "should rename the files in the updates", ->
firstFileUpdateWithVersion = _.extend({}, @firstFileUpdate, {version: "#{@version}.2"})
@ProjectHistoryRedisManager.queueRenameEntity
.calledWith(@project_id, 'file', @firstFileUpdate.id, @user_id, @firstFileUpdate)
.calledWith(@project_id, 'file', @firstFileUpdate.id, @user_id, firstFileUpdateWithVersion)
.should.equal true
it "should not flush the history", ->
@ -72,7 +77,7 @@ describe "ProjectManager", ->
beforeEach ->
@error = new Error('error')
@DocumentManager.renameDocWithLock = sinon.stub().yields(@error)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should call the callback with the error", ->
@callback.calledWith(@error).should.equal true
@ -81,7 +86,7 @@ describe "ProjectManager", ->
beforeEach ->
@error = new Error('error')
@ProjectHistoryRedisManager.queueRenameEntity = sinon.stub().yields(@error)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should call the callback with the error", ->
@callback.calledWith(@error).should.equal true
@ -89,7 +94,7 @@ describe "ProjectManager", ->
describe "with enough ops to flush", ->
beforeEach ->
@HistoryManager.shouldFlushHistoryOps = sinon.stub().returns(true)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should flush the history", ->
@HistoryManager.flushProjectChangesAsync
@ -106,26 +111,36 @@ describe "ProjectManager", ->
docLines: "a\nb"
@docUpdates = [ @firstDocUpdate, @secondDocUpdate ]
@firstFileUpdate =
id: 2
id: 3
url: 'filestore.example.com/2'
@fileUpdates = [ @firstFileUpdate ]
@secondFileUpdate =
id: 4
url: 'filestore.example.com/3'
@fileUpdates = [ @firstFileUpdate, @secondFileUpdate ]
@ProjectHistoryRedisManager.queueAddEntity = sinon.stub().yields()
describe "successfully", ->
beforeEach ->
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should add the docs in the updates", ->
@ProjectHistoryRedisManager.queueAddEntity
.calledWith(@project_id, 'doc', @firstDocUpdate.id, @user_id, @firstDocUpdate)
firstDocUpdateWithVersion = _.extend({}, @firstDocUpdate, {version: "#{@version}.0"})
secondDocUpdateWithVersion = _.extend({}, @secondDocUpdate, {version: "#{@version}.1"})
@ProjectHistoryRedisManager.queueAddEntity.getCall(0)
.calledWith(@project_id, 'doc', @firstDocUpdate.id, @user_id, firstDocUpdateWithVersion)
.should.equal true
@ProjectHistoryRedisManager.queueAddEntity
.calledWith(@project_id, 'doc', @secondDocUpdate.id, @user_id, @secondDocUpdate)
@ProjectHistoryRedisManager.queueAddEntity.getCall(1)
.calledWith(@project_id, 'doc', @secondDocUpdate.id, @user_id, secondDocUpdateWithVersion)
.should.equal true
it "should add the files in the updates", ->
@ProjectHistoryRedisManager.queueAddEntity
.calledWith(@project_id, 'file', @firstFileUpdate.id, @user_id, @firstFileUpdate)
firstFileUpdateWithVersion = _.extend({}, @firstFileUpdate, {version: "#{@version}.2"})
secondFileUpdateWithVersion = _.extend({}, @secondFileUpdate, {version: "#{@version}.3"})
@ProjectHistoryRedisManager.queueAddEntity.getCall(2)
.calledWith(@project_id, 'file', @firstFileUpdate.id, @user_id, firstFileUpdateWithVersion)
.should.equal true
@ProjectHistoryRedisManager.queueAddEntity.getCall(3)
.calledWith(@project_id, 'file', @secondFileUpdate.id, @user_id, secondFileUpdateWithVersion)
.should.equal true
it "should not flush the history", ->
@ -140,7 +155,7 @@ describe "ProjectManager", ->
beforeEach ->
@error = new Error('error')
@ProjectHistoryRedisManager.queueAddEntity = sinon.stub().yields(@error)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should call the callback with the error", ->
@callback.calledWith(@error).should.equal true
@ -149,7 +164,7 @@ describe "ProjectManager", ->
beforeEach ->
@error = new Error('error')
@ProjectHistoryRedisManager.queueAddEntity = sinon.stub().yields(@error)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should call the callback with the error", ->
@callback.calledWith(@error).should.equal true
@ -157,7 +172,7 @@ describe "ProjectManager", ->
describe "with enough ops to flush", ->
beforeEach ->
@HistoryManager.shouldFlushHistoryOps = sinon.stub().returns(true)
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @callback
@ProjectManager.updateProjectWithLocks @project_id, @user_id, @docUpdates, @fileUpdates, @version, @callback
it "should flush the history", ->
@HistoryManager.flushProjectChangesAsync