An occupied worker checks about every 15 seconds if it's current job was
cancelled. Use this to introduce a heartbeat mechanism, where if
composer hasn't heard from the worker in 2 minutes, the job times out
and is set to fail.
JobArgs() function replaced with more general Job() function that
returns all the parameters used to originally define a job during
Enqueue(). This new function enables access to the type of a job in the
queue, which wasn't available until now (except when Dequeueing).
JobArgs() returns the arguments submitted with a job in raw form.
Since the structure of the args are opaque to job queue, it's the
responsibility of the caller to deserialize the arguments.
Args retrieval is added to the existing TestArgs() function.
The status of a job may depend on the status of its dependenices,
as we do not repeat for instance the failed state in each dependent
job.
Return also the list of dependencies so these can be queried too.
Similarly to the recent changes to Dequeue(), let the caller unmarshal the
return JSON. This allows us to pass the result on without being able
to unmarshal it.
In follow-up patches, we will pass results of jobs to dependent jobs,
but the worker API does not know about the different job types, nor how
to unmarshal them.
Once a job has been enqueued, there is no way to query its dependencies.
This makes dequeue more symmetric to enqueue by returning the
dependencies that were passed to enqueue, allowing the caller to
query the dependencies and their results.
Signed-off-by: Tom Gundersen <teg@jklm.no>
The worker server was heavily tied to OSBuildJob(Result). Untie it so
that it can deal with different job types in the future.
This necessitates a change in the jobqueue: Dequeue() now returns the
job type, as well as job arguments as json.RawMessage. This is so that
the server can wait on multiple job types with different argument
types.
The weldr, composer, and koji APIs continue to use only "osbuild" jobs.
The enum is redundant information that can be deduced from the job's
times: queuedAt, startedAt, and finishedAt. Not having it reduces the
potential for inconsistent state.
Now that the "old" `jobqueue` package was renamed to `worker`, add a new
package that contains an interface to an actual job queue. Also add two
implementations: fsjobqueue, a job queue backed by the file system, and
testjobqueue, which can be used as a mock implementation for testing.
These packages are not yet used.
