115 lines
3.2 KiB
Python
Executable File
115 lines
3.2 KiB
Python
Executable File
from collections import Counter
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from functools import reduce
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from ucloud_common.vm import VmPool, VMStatus
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from ucloud_common.host import HostPool, HostStatus
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from ucloud_common.request import RequestEntry, RequestPool, RequestType
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from decouple import config
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from config import etcd_client as client
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vm_pool = VmPool(client, config("VM_PREFIX"))
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host_pool = HostPool(client, config("HOST_PREFIX"))
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request_pool = RequestPool(client, config("REQUEST_PREFIX"))
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def accumulated_specs(vms_specs):
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if not vms_specs:
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return {}
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return reduce((lambda x, y: Counter(x) + Counter(y)), vms_specs)
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def remaining_resources(host_specs, vms_specs):
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"""Return remaining resources host_specs - vms"""
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vms_specs = Counter(vms_specs)
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remaining = Counter(host_specs)
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remaining.subtract(vms_specs)
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return remaining
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def get_suitable_host(vm_specs, hosts=None):
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if hosts is None:
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hosts = host_pool.by_status(HostStatus.alive)
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for host in hosts:
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# Filter them by host_name
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vms = vm_pool.by_host(host.key)
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# Filter them by status
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vms = vm_pool.except_status(VMStatus.requested_new, vms)
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running_vms_specs = [vm.specs for vm in vms]
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# Accumulate all of their combined specs
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running_vms_accumulated_specs = accumulated_specs(
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running_vms_specs
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)
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# Find out remaining resources after
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# host_specs - already running vm_specs
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remaining = remaining_resources(
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host.specs, running_vms_accumulated_specs
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)
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# Find out remaining - new_vm_specs
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remaining = remaining_resources(remaining, vm_specs)
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# if remaining resources >= 0 return this host_name
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if all(
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map(
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lambda x: True if remaining[x] >= 0 else False,
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remaining,
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)
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):
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return host.key
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return None
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def dead_host_detection():
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# Bring out your dead! - Monty Python and the Holy Grail
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hosts = host_pool.by_status(HostStatus.alive)
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dead_hosts_keys = []
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for host in hosts:
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# Only check those who claims to be alive
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if host.status == HostStatus.alive:
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if not host.is_alive():
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dead_hosts_keys.append(host.key)
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return dead_hosts_keys
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def dead_host_mitigation(dead_hosts_keys):
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for host_key in dead_hosts_keys:
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host = host_pool.get(host_key)
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host.declare_dead()
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vms_hosted_on_dead_host = vm_pool.by_host(host_key)
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for vm in vms_hosted_on_dead_host:
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vm.declare_killed()
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vm_pool.put(vm)
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host_pool.put(host)
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def assign_host(vm):
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host_name = get_suitable_host(vm.specs)
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if host_name:
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# if vm.status == VMStatus.requested_new:
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# vm.status = VMStatus.scheduled_deploy
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#
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# if vm.status == VMStatus.killed:
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# vm.status = VMStatus.requested_start
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vm.hostname = host_name
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vm_pool.put(vm)
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r = RequestEntry.from_scratch(type=RequestType.StartVM,
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uuid=vm.uuid,
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hostname=vm.hostname)
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request_pool.put(r)
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vm.log.append("VM scheduled for starting")
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return host_name
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return None
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