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How to use hosts_in_label method in autotest

Best Python code snippet using autotest_python

metahost_scheduler.py

Source:metahost_scheduler.py

2Host Scheduler classes.3"""4class HostSchedulingUtility(object):5    """Interface to host availability information from the scheduler."""6    def hosts_in_label(self, label_id):7        """Return potentially usable hosts with the given label."""8        raise NotImplementedError9    def remove_host_from_label(self, host_id, label_id):10        """Remove this host from the internal list of usable hosts in the label.11        This is provided as an optimization -- when code gets a host from a12        label and concludes it's unusable, it can call this to avoid getting13        that host again in the future (within this tick).  This function should14        not affect correctness.15        """16        raise NotImplementedError17    def pop_host(self, host_id):18        """Remove and return a host from the internal list of available hosts.19        """20        raise NotImplementedError21    def ineligible_hosts_for_entry(self, queue_entry):22        """Get the list of hosts ineligible to run the given queue entry."""23        raise NotImplementedError24    def is_host_usable(self, host_id):25        """Determine if the host is currently usable at all."""26        raise NotImplementedError27    def is_host_eligible_for_job(self, host_id, queue_entry):28        """Determine if the host is eligible specifically for this queue entry.29        :param queue_entry: a HostQueueEntry DBObject30        """31        raise NotImplementedError32class MetahostScheduler(object):33    def can_schedule_metahost(self, queue_entry):34        """Return true if this object can schedule the given queue entry.35        At most one MetahostScheduler should return true for any given entry.36        :param queue_entry: a HostQueueEntry DBObject37        """38        raise NotImplementedError39    def schedule_metahost(self, queue_entry, scheduling_utility):40        """Schedule the given queue entry, if possible.41        This method should make necessary database changes culminating in42        assigning a host to the given queue entry in the database.  It may43        take no action if no host can be assigned currently.44        :param queue_entry: a HostQueueEntry DBObject45        :param scheduling_utility: a HostSchedulingUtility object46        """47        raise NotImplementedError48    def recovery_on_startup(self):49        """Perform any necessary recovery upon scheduler startup."""50        pass51    def tick(self):52        """Called once per scheduler cycle; any actions are allowed."""53        pass54class LabelMetahostScheduler(MetahostScheduler):55    def can_schedule_metahost(self, queue_entry):56        return bool(queue_entry.meta_host)57    def schedule_metahost(self, queue_entry, scheduling_utility):58        label_id = queue_entry.meta_host59        hosts_in_label = scheduling_utility.hosts_in_label(label_id)60        ineligible_host_ids = scheduling_utility.ineligible_hosts_for_entry(61            queue_entry)62        for host_id in hosts_in_label:63            if not scheduling_utility.is_host_usable(host_id):64                scheduling_utility.remove_host_from_label(host_id, label_id)65                continue66            if host_id in ineligible_host_ids:67                continue68            if not scheduling_utility.is_host_eligible_for_job(host_id,69                                                               queue_entry):70                continue71            # Remove the host from our cached internal state before returning72            scheduling_utility.remove_host_from_label(host_id, label_id)73            host = scheduling_utility.pop_host(host_id)...

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