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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
111 lines
3.6 KiB
CoffeeScript
111 lines
3.6 KiB
CoffeeScript
{DestroyCategoryTask,
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NylasAPI,
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Task,
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APIError,
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Label,
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Folder,
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DatabaseStore,
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DatabaseTransaction} = require "nylas-exports"
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describe "DestroyCategoryTask", ->
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pathOf = (fn) ->
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fn.calls[0].args[0].path
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methodOf = (fn) ->
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fn.calls[0].args[0].method
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accountIdOf = (fn) ->
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fn.calls[0].args[0].accountId
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nameOf = (fn) ->
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fn.calls[0].args[0].body.display_name
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makeTask = (CategoryClass) ->
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category = new CategoryClass
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displayName: "important emails"
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accountId: "account 123"
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serverId: "server-444"
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new DestroyCategoryTask
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category: category
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beforeEach ->
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spyOn(DatabaseTransaction.prototype, '_query').andCallFake -> Promise.resolve([])
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spyOn(DatabaseTransaction.prototype, 'persistModel').andCallFake -> Promise.resolve()
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describe "performLocal", ->
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it "sets an `isDeleted` flag and persists the category", ->
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task = makeTask(Folder)
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runs =>
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task.performLocal()
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waitsFor =>
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DatabaseTransaction.prototype.persistModel.callCount > 0
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runs =>
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model = DatabaseTransaction.prototype.persistModel.calls[0].args[0]
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expect(model.serverId).toEqual "server-444"
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expect(model.isDeleted).toBe true
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describe "performRemote", ->
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it "throws error when no category present", ->
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waitsForPromise ->
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task = makeTask(Label)
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task.category = null
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task.performRemote()
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.then ->
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throw new Error('The promise should reject')
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.catch Error, (err) ->
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expect(err).toBeDefined()
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it "throws error when category does not have a serverId", ->
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waitsForPromise ->
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task = makeTask(Label)
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task.category.serverId = undefined
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task.performRemote()
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.then ->
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throw new Error('The promise should reject')
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.catch Error, (err) ->
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expect(err).toBeDefined()
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describe "when request succeeds", ->
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beforeEach ->
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spyOn(NylasAPI, "makeRequest").andCallFake -> Promise.resolve("null")
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it "sends API req to /labels if user uses labels", ->
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task = makeTask(Label)
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task.performRemote()
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expect(pathOf(NylasAPI.makeRequest)).toBe "/labels/server-444"
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it "sends API req to /folders if user uses folders", ->
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task = makeTask(Folder)
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task.performRemote()
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expect(pathOf(NylasAPI.makeRequest)).toBe "/folders/server-444"
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it "sends DELETE request", ->
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task = makeTask(Folder)
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task.performRemote()
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expect(methodOf(NylasAPI.makeRequest)).toBe "DELETE"
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it "sends the account id", ->
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task = makeTask(Label)
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task.performRemote()
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expect(accountIdOf(NylasAPI.makeRequest)).toBe "account 123"
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describe "when request fails", ->
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beforeEach ->
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spyOn(NylasEnv, 'emitError')
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spyOn(NylasAPI, 'makeRequest').andCallFake ->
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Promise.reject(new APIError({statusCode: 403}))
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it "updates the isDeleted flag for the category and notifies error", ->
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waitsForPromise ->
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task = makeTask(Folder)
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spyOn(task, "_notifyUserOfError")
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task.performRemote().then (status) ->
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expect(status).toEqual Task.Status.Failed
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expect(task._notifyUserOfError).toHaveBeenCalled()
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expect(NylasEnv.emitError).toHaveBeenCalled()
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expect(DatabaseTransaction.prototype.persistModel).toHaveBeenCalled()
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model = DatabaseTransaction.prototype.persistModel.calls[0].args[0]
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expect(model.serverId).toEqual "server-444"
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expect(model.isDeleted).toBe false
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