#!/usr/bin/env python

from __future__ import absolute_import, print_function

import subprocess

from . import clientactor
from . import config

import arvados.util

class ArvadosNodeListMonitorActor(clientactor.RemotePollLoopActor):
    """Actor to poll the Arvados node list.

    This actor regularly polls the list of Arvados node records, and
    sends it to subscribers.
    """

    def is_common_error(self, exception):
        return isinstance(exception, config.ARVADOS_ERRORS)

    def _item_key(self, node):
        return node['uuid']

    def _send_request(self):
        nodelist = arvados.util.list_all(self._client.nodes().list)

        # node hostname, state
        sinfo_out = subprocess.check_output(["sinfo", "--noheader", "--format=%n %t"])
        nodestates = {}
        for out in sinfo_out.splitlines():
            nodename, state = out.split(" ", 2)
            if state in ('alloc', 'comp'):
                nodestates[nodename] = 'busy'
            elif state == 'idle':
                nodestates[nodename] = 'idle'
            else:
                nodestates[nodename] = 'down'

        for n in nodelist:
            if n["slot_number"] and n["hostname"] and n["hostname"] in nodestates:
                n["crunch_worker_state"] = nodestates[n["hostname"]]
            else:
                n["crunch_worker_state"] = 'down'

        return nodelist

class CloudNodeListMonitorActor(clientactor.RemotePollLoopActor):
    """Actor to poll the cloud node list.

    This actor regularly polls the cloud to get a list of running compute
    nodes, and sends it to subscribers.
    """

    def is_common_error(self, exception):
        return self._client.is_cloud_exception(exception)

    def _item_key(self, node):
        return node.id

    def _send_request(self):
        n = self._client.list_nodes()
        return n