// ableToRun determines if the Agent can run the provided Job based on
// the Agent's desired state. A boolean indicating whether this is the
// case or not is returned. The following criteria is used:
// - Agent must meet the Job's machine target requirement (if any)
// - Job must pass signature verification
// - Agent must have all of the Job's required metadata (if any)
// - Agent must have all required Peers of the Job scheduled locally (if any)
// - Job must not conflict with any other Jobs scheduled to the agent
func (ar *AgentReconciler) ableToRun(as *agentState, ms *machine.MachineState, j *job.Job) (bool, string) {
log.V(1).Infof("Attempting to determine if able to run Job(%s)", j.Name)
if tgt, ok := j.RequiredTarget(); ok && !ms.MatchID(tgt) {
return false, fmt.Sprintf("Agent ID %q does not match required %q", ms.ID, tgt)
}
if !ar.verifyJobSignature(j) {
return false, "unable to verify signature"
}
log.V(1).Infof("Job(%s) has requirements: %s", j.Name, j.Requirements())
metadata := j.RequiredTargetMetadata()
if len(metadata) == 0 {
log.V(1).Infof("Job(%s) has no required machine metadata", j.Name)
} else {
log.V(1).Infof("Job(%s) requires machine metadata: %v", j.Name, metadata)
if !machine.HasMetadata(ms, metadata) {
return false, "local Machine metadata insufficient"
}
}
peers := j.Peers()
if len(peers) == 0 {
log.V(1).Infof("Job(%s) has no required peers", j.Name)
} else {
log.V(1).Infof("Job(%s) requires peers: %v", j.Name, peers)
for _, peer := range peers {
if !as.jobScheduled(peer) {
return false, fmt.Sprintf("required peer Job(%s) is not scheduled locally", peer)
}
}
}
if cExists, cJobName := as.hasConflict(j.Name, j.Conflicts()); cExists {
return false, fmt.Sprintf("found conflict with locally-scheduled Job(%s)", cJobName)
}
log.V(1).Infof("Determined local Agent is able to run Job(%s)", j.Name)
return true, ""
}
