func (as *AgentState) GetReplacedUnit(j *job.Job) (string, error) {
cExists, replaced := as.hasReplace(j.Name, j.Replaces())
if !cExists {
return "", fmt.Errorf("cannot find units to be replaced for Unit(%s)", j.Name)
}
return replaced, nil
}
// AbleToRun determines if an Agent can run the provided Job based on
// the Agent's current 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)
// - 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 Units scheduled to the agent
// - Job must specially handle replaced units to be rescheduled
func (as *AgentState) AbleToRun(j *job.Job) (jobAction job.JobAction, errstr string) {
if tgt, ok := j.RequiredTarget(); ok && !as.MState.MatchID(tgt) {
return job.JobActionUnschedule, fmt.Sprintf("agent ID %q does not match required %q", as.MState.ID, tgt)
}
metadata := j.RequiredTargetMetadata()
if len(metadata) != 0 {
if !machine.HasMetadata(as.MState, metadata) {
return job.JobActionUnschedule, "local Machine metadata insufficient"
}
}
peers := j.Peers()
if len(peers) != 0 {
for _, peer := range peers {
if !as.unitScheduled(peer) {
return job.JobActionUnschedule, fmt.Sprintf("required peer Unit(%s) is not scheduled locally", peer)
}
}
}
if cExists, cJobName := as.HasConflict(j.Name, j.Conflicts()); cExists {
return job.JobActionUnschedule, fmt.Sprintf("found conflict with locally-scheduled Unit(%s)", cJobName)
}
// Handle Replace option specially for rescheduling the unit
if cExists, cJobName := as.hasReplace(j.Name, j.Replaces()); cExists {
return job.JobActionReschedule, fmt.Sprintf("found replace with locally-scheduled Unit(%s)", cJobName)
}
return job.JobActionSchedule, ""
}