def vm_info_dump():
# Periodic tasks - get all the vms in VCenter and dump to json file
for vc in VC_POOL.keys():
    conn = VCenterInfo(vc)
    vm_info_list = conn.get_vc_vm(vc)
    file_name = vc
    json.dump(
        vm_info_list,
        open(BASE_DIR + '/vmserver/data/{0}.json'.format(file_name), 'w'),
        ensure_ascii=False, indent=4
    )

class VCenterInfo(object):

def __init__(self, ip, user=USER, passwd=PASSWORD):
    # init connection
    self.ip = ip
    self.user = user
    self.password = passwd
    self.si = connect.SmartConnect(
        host=self.ip,
        user=self.user,
        pwd=self.password
    )

def vms_info(self):
    # vm obj list
    atexit.register(connect.Disconnect, self.si)
    content = self.si.RetrieveContent()
    container = content.rootFolder
    VmViewType = [vim.VirtualMachine]
    recursive = True
    VmContainerView = content.viewManager.CreateContainerView(
        container, VmViewType, recursive)
    vm_children = VmContainerView.view

    return vm_children

def get_vc_vm(self, vc):
    vms = self.vms_info()
    data_list = []
    for vm in vms:
        data = {}
        summary = vm.summary
        guest = vm.guest
        config = vm.config
        runtime = vm.runtime
        devices = vm.config.hardware.device
        # if hasattr(summary, 'config')
        disk_kb = 0
        for device in devices:
            if isinstance(device, vim.vm.device.VirtualDisk):
                disk_kb_one = device.capacityInKB
                disk_kb += disk_kb_one
        total_disk_gb = disk_kb / 1024 / 1024
        data['instance_uuid'] = config.instanceUuid
        data['list_name'] = config.name
        data['hostname'] = guest.hostName
        data['ip'] = get_public_ip(vm)
        data['os'] = guest.guestFamily
        data['os_version'] = guest.guestFullName
        if hasattr(config, 'hardware'):
            data['cpu'] = config.hardware.numCPU
            data['mem'] = config.hardware.memoryMB / 1024
        data['total_hard_disk'] = total_disk_gb
        data['tools_status'] = guest.toolsStatus
        data['guest_status'] = guest.guestState
        data['power_status'] = runtime.powerState
        data['vc'] = vc
        data['esxi_host'] = runtime.host.name
        data['template'] = summary.config.template
        data_list.append(data)
    return data_list