Summary:
Ref T9252. Broadly, Drydock currently races on releasing objects from the "active" state. To reproduce this:
- Scatter some sleep()s pretty much anywhere in the release code.
- Release several times from web UI or CLI in quick succession.
Resources or leases will execute some release code twice or otherwise do inconsistent things.
(I didn't chase down a detailed reproduction scenario for this since inspection of the code makes it clear that there are no meaningful locks or mechanisms preventing this.)
Instead, add a Harbormaster-style command queue to resources and leases. When something wants to do a release, it adds a command to the queue and schedules a worker. The workers acquire a lock, then try to consume commands from the queue.
This guarantees that only one process is responsible for writes to active resource/leases.
This is the last major step to giving resources and leases a single writer during all states:
- Resource, Unsaved: AllocatorWorker
- Resource, Pending: ResourceWorker (Possible rename to "Allocated?")
- Resource, Open: This diff, ResourceUpdateWorker. (Likely rename to "Active").
- Resource, Closed/Broken: Future destruction worker. (Likely rename to "Released" / "Broken"; maybe remove "Broken").
- Resource, Destroyed: No writes.
- Lease, Unsaved: Whatever wants the lease.
- Lease, Pending: AllocatorWorker
- Lease, Acquired: LeaseWorker
- Lease, Active: This diff, LeaseUpdateWorker.
- Lease, Released/Broken: Future destruction worker (Maybe remove "Broken"?)
- Lease, Expired: No writes. (Likely rename to "Destroyed").
In most phases, we can already guarantee that there is a single writer without doing any extra work. This is more complicated in the "Active" case because the release buttons on the web UI, the release tools on the CLI, the lease requestor itself, the garbage collector, and any other release process cleaning up related objects may try to effect a release. All of these could race one another (and, in many cases, race other processes from other phases because all of these get to act immediately) as this code is currently written. Using a queue here lets us make sure there's only a single writer in this phase.
One thing which is notable is that whatever acquires a lease **can not write to it**! It is never the writer once it queues the lease for activation. It can not write to any resources, either. And, likewise, Blueprints can not write to resources while acquiring or releasing leases.
We may need to provide a mechinism so that blueprints and/or resource/lease holders get to attach some storage to resources/leases for bookkeeping. For example, a blueprint might need to keep some kind of cache on a resource to help it manage state. But I think we can cross that bridge when we come to it, and nothing else would need to write to this storage so it's technically straightforward to introduce such a mechanism if we need one.
Test Plan:
- Viewed buttons in web UI, checked enabled/disabled states.
- Clicked the buttons.
- Saw commands show up in the command queue.
- Saw some daemon stuff get scheduled.
- Ran CLI tools, saw commands get consumed and resources/leases release.
Reviewers: hach-que, chad
Reviewed By: chad
Maniphest Tasks: T9252
Differential Revision: https://secure.phabricator.com/D14143
Summary: Fixes T8659. This isn't //explicitly// documented but I'm going to wait for a bit until the "Harbormaster" doc splits into internal/external builds to add docs for it. There's other similar stuff coming soon anyway.
Test Plan:
{F716439}
{F716440}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T8659
Differential Revision: https://secure.phabricator.com/D13903
Summary:
Ref T8659. In the general case, this eventually allows build processes to do things like:
- Upload build results (like a ".app" or ".exe" or other binary).
- Pass complex results between build steps (e.g., build step A does something hard and build step B uses it to do something else).
Today, we're a long way away from having the infrastructure for that. However, it is useful to let third party build processes (like Jenkins) upload URIs that link back to the external build results.
This adds `harbormaster.createartifact` so they can do that. The only useful thing to do with this method today is have your Jenkins build do this:
params = array(
"uri": "https://jenkins.mycompany.com/build/23923/details/",
"name": "View Build Results in Jenkins",
"ui.external": true,
);
harbormaster.createartifact(target, 'uri', params);
Then (after the next diff) we'll show a link in Differential and a prominent link in Harbormaster. I didn't actually do the UI stuff in this diff since it's already pretty big.
This change moves a lot of code around, too:
- Adds PHIDs to artifacts.
- It modularizes build artifact types (currently "file", "host" and "URI").
- It formalizes build artifact parameters and construction:
- This lets me generate usable documentation about how to create artifacts.
- This prevents users from doing dangerous or policy-violating things.
- It does some other general modernization.
Test Plan:
{F715633}
{F715634}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T8659
Differential Revision: https://secure.phabricator.com/D13900
