uncloud/ucloud/host/main.py

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import argparse
import multiprocessing as mp
import time
import sys
from ucloud.common.request import RequestEntry, RequestType
from ucloud.common.host import HostPool
from ucloud.shared import shared
from ucloud.settings import settings
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from . import virtualmachine, logger
vmm = virtualmachine.VMM()
def update_heartbeat(hostname):
"""Update Last HeartBeat Time for :param hostname: in etcd"""
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host_pool = shared.host_pool
this_host = next(filter(lambda h: h.hostname == hostname, host_pool.hosts), None)
while True:
this_host.update_heartbeat()
host_pool.put(this_host)
time.sleep(10)
def main(hostname):
host_pool = shared.host_pool
host = next(filter(lambda h: h.hostname == hostname, host_pool.hosts), None)
assert host is not None, "No such host with name = {}".format(hostname)
try:
heartbeat_updating_process = mp.Process(target=update_heartbeat, args=(hostname,))
heartbeat_updating_process.start()
except Exception as e:
logger.exception(e)
sys.exit("No Need To Go Further. ucloud-host heartbeat updating mechanism is not working")
for events_iterator in [
shared.etcd_client.get_prefix(settings['etcd']['request_prefix'], value_in_json=True),
shared.etcd_client.watch_prefix(settings['etcd']['request_prefix'], timeout=10, value_in_json=True),
]:
for request_event in events_iterator:
request_event = RequestEntry(request_event)
if request_event.type == "TIMEOUT":
vmm.maintenance(host)
continue
# If the event is directed toward me OR I am destination of a InitVMMigration
if request_event.hostname == host.key or request_event.destination == host.key:
logger.debug("VM Request: %s", request_event)
shared.request_pool.client.client.delete(request_event.key)
vm_entry = shared.vm_pool.get(request_event.uuid)
if vm_entry:
if request_event.type == RequestType.StartVM:
vmm.start(vm_entry)
elif request_event.type == RequestType.StopVM:
vmm.stop(vm_entry)
elif request_event.type == RequestType.DeleteVM:
vmm.delete(vm_entry)
elif request_event.type == RequestType.InitVMMigration:
vmm.start(vm_entry, host.key)
elif request_event.type == RequestType.TransferVM:
vmm.transfer(request_event)
else:
logger.info("VM Entry missing")
logger.info("Running VMs %s", vmm.running_vms)
if __name__ == "__main__":
argparser = argparse.ArgumentParser()
argparser.add_argument("hostname", help="Name of this host. e.g /v1/host/1")
args = argparser.parse_args()
mp.set_start_method('spawn')
main(args.hostname)