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ea76b7c442
Summary:
Until now, we've been hiding transactions beneath the surface. When you call persistModel, you're implicitly creating a transaction.
You could explicitly create them with `atomically`..., but there were several critical problems that are fixed in this diff:
- Calling persistModel / unpersistModel within a transaction could cause the DatabaseStore to trigger. This could result in other parts of the app making queries /during/
the transaction, potentially before the COMMIT occurred and saved the changes. The new, explicit inTransaction syntax holds all changes until after COMMIT and then triggers.
- Calling atomically and then calling persistModel inside that resulted in us having to check whether a transaction was present and was gross.
- Many parts of the code ran extensive logic inside a promise chained within `atomically`:
BAD:
```
DatabaseStore.atomically =>
DatabaseStore.persistModel(draft) =>
GoMakeANetworkRequestThatReturnsAPromise
```
OVERWHELMINGLY BETTER:
```
DatabaseStore.inTransaction (t) =>
t.persistModel(draft)
.then =>
GoMakeANetworkRequestThatReturnsAPromise
```
Having explicit transactions also puts us on equal footing with Sequelize and other ORMs. Note that you /have/ to call DatabaseStore.inTransaction (t) =>. There is no other way to access the methods that let you alter the database. :-)
Other changes:
- This diff removes Message.labels and the Message-Labels table. We weren't using Message-level labels anywhere, and the table could grow very large.
- This diff changes the page size during initial sync from 250 => 200 in an effort to make transactions a bit faster.
Test Plan: Run tests!
Reviewers: juan, evan
Reviewed By: juan, evan
Differential Revision: https://phab.nylas.com/D2353
178 lines
7.6 KiB
CoffeeScript
178 lines
7.6 KiB
CoffeeScript
_ = require 'underscore'
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Label = require '../../src/flux/models/label'
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Thread = require '../../src/flux/models/thread'
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Message = require '../../src/flux/models/message'
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Actions = require '../../src/flux/actions'
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NylasAPI = require '../../src/flux/nylas-api'
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DatabaseStore = require '../../src/flux/stores/database-store'
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ChangeLabelsTask = require '../../src/flux/tasks/change-labels-task'
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{APIError} = require '../../src/flux/errors'
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{Utils} = require '../../src/flux/models/utils'
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testLabels = {}
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testThreads = {}
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describe "ChangeLabelsTask", ->
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beforeEach ->
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# IMPORTANT: These specs do not run the performLocal logic of their superclass!
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# Tests for that logic are in change-mail-task-spec.
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spyOn(ChangeLabelsTask.__super__, 'performLocal').andCallFake =>
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Promise.resolve()
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spyOn(DatabaseStore, 'modelify').andCallFake (klass, items) =>
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Promise.resolve items.map (item) =>
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return testLabels[item] if testLabels[item]
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return testThreads[item] if testThreads[item]
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item
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testLabels = @testLabels =
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"l1": new Label({name: 'inbox', id: 'l1', displayName: "INBOX"}),
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"l2": new Label({name: 'drafts', id: 'l2', displayName: "MyDrafts"})
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"l3": new Label({name: null, id: 'l3', displayName: "My Label"})
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testThreads = @testThreads =
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't1': new Thread(id: 't1', labels: [@testLabels['l1']])
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't2': new Thread(id: 't2', labels: _.values(@testLabels))
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't3': new Thread(id: 't3', labels: [@testLabels['l2'], @testLabels['l3']])
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@basicThreadTask = new ChangeLabelsTask
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labelsToAdd: ["l1", "l2"]
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labelsToRemove: ["l3"]
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threads: ['t1']
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describe "description", ->
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it "should include the name of the added label if it's the only mutation and it was provided as an object", ->
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task = new ChangeLabelsTask(labelsToAdd: ["l1"], labelsToRemove: [], threads: ['t1'])
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expect(task.description()).toEqual("Changed labels on 1 thread")
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task = new ChangeLabelsTask(labelsToAdd: [new Label(id: 'l1', displayName: 'LABEL')], labelsToRemove: [], threads: ['t1'])
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expect(task.description()).toEqual("Added LABEL to 1 thread")
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task = new ChangeLabelsTask(labelsToAdd: [new Label(id: 'l1', displayName: 'LABEL')], labelsToRemove: ['l2'], threads: ['t1'])
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expect(task.description()).toEqual("Changed labels on 1 thread")
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it "should include the name of the removed label if it's the only mutation and it was provided as an object", ->
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task = new ChangeLabelsTask(labelsToAdd: [], labelsToRemove: ["l1"], threads: ['t1'])
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expect(task.description()).toEqual("Changed labels on 1 thread")
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task = new ChangeLabelsTask(labelsToAdd: [], labelsToRemove: [new Label(id: 'l1', displayName: 'LABEL')], threads: ['t1'])
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expect(task.description()).toEqual("Removed LABEL from 1 thread")
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task = new ChangeLabelsTask(labelsToAdd: ['l2'], labelsToRemove: [new Label(id: 'l1', displayName: 'LABEL')], threads: ['t1'])
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expect(task.description()).toEqual("Changed labels on 1 thread")
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it "should pluralize properly", ->
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task = new ChangeLabelsTask(labelsToAdd: ["l2"], labelsToRemove: ["l1"], threads: ['t1', 't2', 't3'])
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expect(task.description()).toEqual("Changed labels on 3 threads")
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describe "performLocal", ->
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it "should throw an exception if task has not been given a label, has been given messages, or no threads", ->
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badTasks = [
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new ChangeLabelsTask(),
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new ChangeLabelsTask(threads: [123]),
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new ChangeLabelsTask(threads: [123], messages: ["foo"]),
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new ChangeLabelsTask(labelsToAdd: ['l2'], labelsToRemove: ['l1'], messages: [123]),
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new ChangeLabelsTask(threads: "Thread"),
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]
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goodTasks = [
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new ChangeLabelsTask(
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labelsToAdd: ['l2']
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labelsToRemove: ['l1']
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threads: ['t1']
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)
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]
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caught = []
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succeeded = []
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runs ->
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[].concat(badTasks, goodTasks).forEach (task) ->
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task.performLocal()
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.then -> succeeded.push(task)
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.catch (err) -> caught.push(task)
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waitsFor ->
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succeeded.length + caught.length == 6
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runs ->
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expect(caught.length).toEqual(badTasks.length)
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expect(succeeded.length).toEqual(goodTasks.length)
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it 'calls through to super performLocal', ->
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task = new ChangeLabelsTask
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labelsToAdd: ['l2']
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labelsToRemove: ['l1']
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threads: ['t1']
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waitsForPromise =>
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task.performLocal().then =>
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expect(task.constructor.__super__.performLocal).toHaveBeenCalled()
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describe "when object IDs are provided", ->
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beforeEach ->
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@task = new ChangeLabelsTask
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labelsToAdd: ['l2']
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labelsToRemove: ['l1']
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threads: ['t1']
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it 'resolves the objects before calling super', ->
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waitsForPromise =>
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@task.performLocal().then =>
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expect(@task.labelsToAdd).toEqual([testLabels['l2']])
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expect(@task.labelsToRemove).toEqual([testLabels['l1']])
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expect(@task.threads).toEqual([testThreads['t1']])
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describe "when objects are provided", ->
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beforeEach ->
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@task = new ChangeLabelsTask
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labelsToAdd: [testLabels['l2']]
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labelsToRemove: [testLabels['l1']]
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threads: [testThreads['t1']]
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it 'still has the objects when calling super', ->
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waitsForPromise =>
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@task.performLocal().then =>
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expect(@task.labelsToAdd).toEqual([testLabels['l2']])
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expect(@task.labelsToRemove).toEqual([testLabels['l1']])
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expect(@task.threads).toEqual([testThreads['t1']])
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describe 'change methods', ->
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describe "changesToModel", ->
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it 'properly adds labels', ->
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task = new ChangeLabelsTask
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labelsToAdd: [testLabels['l1'], testLabels['l2']]
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labelsToRemove: []
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out = task.changesToModel(testThreads['t1'])
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expect(out).toEqual(labels: [testLabels['l1'], testLabels['l2']])
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it 'properly removes labels', ->
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task = new ChangeLabelsTask
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labelsToAdd: []
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labelsToRemove: [testLabels['l1'], testLabels['l2']]
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out = task.changesToModel(testThreads['t3'])
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expect(out).toEqual(labels: [testLabels['l3']])
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it 'properly adds and removes labels', ->
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task = new ChangeLabelsTask
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labelsToAdd: [testLabels['l1'], testLabels['l2']]
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labelsToRemove: [testLabels['l2'], testLabels['l3']]
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out = task.changesToModel(testThreads['t1'])
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expect(out).toEqual(labels: [testLabels['l1']])
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it 'should return an == array of labels when no changes have occurred', ->
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thread = new Thread(id: '1', labels: [testLabels['l2'], testLabels['l3'], testLabels['l1']])
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task = new ChangeLabelsTask
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labelsToAdd: [testLabels['l3'], testLabels['l1'], testLabels['l2']]
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labelsToRemove: []
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out = task.changesToModel(thread)
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expect(_.isEqual(thread.labels, out.labels)).toBe(true)
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it 'should not modify the input thread in any way', ->
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thread = new Thread(id: '1', labels: [testLabels['l2'], testLabels['l1']])
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task = new ChangeLabelsTask
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labelsToAdd: []
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labelsToRemove: [testLabels['l2']]
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out = task.changesToModel(thread)
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expect(thread.labels.length).toBe(2)
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expect(out.labels.length).toBe(1)
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describe "requestBodyForModel", ->
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it 'returns labels:<ids> for both threads and messages', ->
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task = new ChangeLabelsTask()
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out = task.requestBodyForModel(testThreads['t3'])
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expect(out).toEqual(labels: ['l2', 'l3'])
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