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🌱 tmc e2e : Split SyncerFixture #2730

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merged 6 commits into from
Feb 7, 2023

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Summary

Split the SyncerFixture start method to provide a way to only maintain Synctarget heartbeat and import apis, without
effectively syncing upstream resources.

Related issue(s)

No related issue, but this is required in order to avoid conflicting with the e2e tests of the Upsyncer virtual workspace with the implementation of the Upsyncer controller (on the Syncer side) is merged.
This will also allow lighter e2e tests for all the tests that don't need effective syncing of resources to the downstream cluster.

@davidfestal davidfestal force-pushed the split-SyncerFixture branch 2 times, most recently from a8933e9 to d597bdf Compare February 2, 2023 20:17
@davidfestal davidfestal changed the title 🌱 [WIP] tmc e2e : Split SyncerFixture 🌱 tmc e2e : Split SyncerFixture Feb 2, 2023
test/e2e/framework/syncer.go Outdated Show resolved Hide resolved
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kcpSyncTargetInformerFactory.Start(ctx.Done())
kcpSyncTargetInformerFactory.WaitForCacheSync(ctx.Done())

go apiImporter.Start(klog.NewContext(ctx, klog.FromContext(ctx).WithValues("resources", resources)), 5*time.Second)
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why is the api importer needed in this fixture?

Could we make it optional in another StartAPIImporter method?

I.e. something like syncerFxture.StartHeartBeat(...).StartAPIImport(...)?

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Rule of thumb: smaller fixtures

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And a fixture without the need of a downstream cluster would be probably a good idea.

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For the SyncTarget to be ready to use, we would expected, in most tests, that the API compatibility check has been run and that the Accepted (or Imcompatible in some cases) state would be set to every resource of the synctarget.Status.SyncedResources array.

There are very few e2e tests that don't even require this information in the SyncTarget, even maybe none.

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I have separated the 2 functions as you proposed:

syncerFixture.CreateAndStartHeartBeat(t).StartAPIImporter(t)

And a fixture without the need of a downstream cluster would be probably a good idea.

I'd rather keep that for later, since I don't see the need of this right now, and this would involve more coding / refactoring. Do you agree ?

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@davidfestal davidfestal Feb 6, 2023

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I went a step further and allowed stopping the heatbeat and starting it again. This would be useful for some tests @jmprusi is currently writing.

So the way to create a syncer with APIImports and heatbeats is now:

syncerFixture..Create(t).StartAPIImporter(t).StartHeartBeat(t)

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Thanks! worked perfectly for my PR! being able to start/stop the heartbeat allows us to test some "complex" scheduling scenarios!

@davidfestal davidfestal force-pushed the split-SyncerFixture branch 4 times, most recently from e2d15f4 to ac998d9 Compare February 6, 2023 18:44
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@jmprusi Is the new ability to call StopHeartBeat() and call the StartHeartBeat() again later working for your new e2e test case ?

pkg/syncer/syncer.go Outdated Show resolved Hide resolved
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// and then starts a new syncer against the given upstream kcp workspace.
// Whether the syncer runs in-process or deployed on a pcluster will depend
// whether --pcluster-kubeconfig and --syncer-image are supplied to the test invocation.
func (sf *syncerFixture) CreateAndStart(t *testing.T) *StartedSyncerFixture {
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am confused. How is a SyncTarget applied to the physical cluster?

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This looks a whole lot like Create(t).StartSyncer(t), i.e. it overlaps with Create, no?

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Yeah, bad wording. The SyncTarget is not what is applied. But the Syncer-related resources are applied in the physical cluster.

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Fixed in commit 13a4a06

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This looks a whole lot like Create(t).StartSyncer(t), i.e. it overlaps with Create, no?

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I changed it to have either:

syncerFixture.Create(t).StartSyncer(t)

or

syncerFixture.Create(t).StartAPIImporter(t).StartHeartBeat(t)

kcpSyncTargetInformerFactory.Start(ctx.Done())
kcpSyncTargetInformerFactory.WaitForCacheSync(ctx.Done())

go apiImporter.Start(klog.NewContext(ctx, klog.FromContext(ctx).WithValues("resources", resources)), 5*time.Second)
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I think I asked before, maybe the comment/answer got lost: why do we have to run a full api importer, why not just set some conditions to fake the outcome?

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Afair you asked about replacing the the whole logic of checking authorization for synced resources in the downstream cluster, which drives the "Authorized" condition. This logic I effectively removed, since the Authorized condition is not checked by any KCP controller.

It seems to me that the API importer is something else: It doesn't drive a direct condition, but allows the compatibility check controller, which runs on the KCP side, to set the Accepted status on every resource of the syncTarget.syncedResources array.
If we try to set this status manually on the SyncTarget in the test fixture, the KCP controller will very probably reset the values to incompatible until it has the downstream schemas imported.

See my previous comment: #2730 (comment)

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jmprusi commented Feb 7, 2023

/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Feb 7, 2023
test/e2e/framework/syncer.go Outdated Show resolved Hide resolved
... to provide a way to only maintain
heartbeat and import apis without
effectively syncing.

And change all the candidate tests to use the new function.

Signed-off-by: David Festal <dfestal@redhat.com>
Signed-off-by: David Festal <dfestal@redhat.com>
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jmprusi commented Feb 7, 2023

@jmprusi Is the new ability to call StopHeartBeat() and call the StartHeartBeat() again later working for your new e2e test case ?

Yes, I'm using it for testing the resource scheduler interaction with upsynced resources (#2533), and being able to stop the syncer and restart is required.

... into 2 functions: `Create()` (already exists) and
`StartSyncer()`.

Signed-off-by: David Festal <dfestal@redhat.com>
@openshift-ci openshift-ci bot removed the lgtm Indicates that a PR is ready to be merged. label Feb 7, 2023
Signed-off-by: David Festal <dfestal@redhat.com>
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Signed-off-by: David Festal <dfestal@redhat.com>
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sttts commented Feb 7, 2023

/approve

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openshift-ci bot commented Feb 7, 2023

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sttts

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@openshift-ci openshift-ci bot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Feb 7, 2023
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jmprusi commented Feb 7, 2023

/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Feb 7, 2023
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Signed-off-by: David Festal <dfestal@redhat.com>
@openshift-ci openshift-ci bot removed the lgtm Indicates that a PR is ready to be merged. label Feb 7, 2023
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jmprusi commented Feb 7, 2023

/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Feb 7, 2023
@openshift-merge-robot openshift-merge-robot merged commit 74e06bb into kcp-dev:main Feb 7, 2023
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4 participants