mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-08 19:26:48 +00:00
d9f9ebab58
The capacity read lived in its own module with raw libvirt calls and a thread pool with a deadline, beside helpers that already read the same things. It now uses them: - wvmHostDetails.get_capacity() sums the vCPUs and memory of all and of the running VMs from get_host_instances(), against the host's info. - get_storages_info() also gives each pool's free space. - Compute.capacity joins the two, like cpu_count and ram_size, and is None when the host is down or the read fails. The page reads the hosts one after another, as it already connected to each of them; a host that cannot be reached is given up after the connect timeout. computes/capacity.py and its thread handling are gone. The page looks and sorts as before.
121 lines
4.3 KiB
Python
121 lines
4.3 KiB
Python
from ipaddress import ip_address
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from django.db import transaction
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from django.db.models import CharField, IntegerField, Model
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from django.utils.functional import cached_property
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from django.utils.translation import gettext_lazy as _
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from libvirt import libvirtError, virConnect
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from computes.validators import validate_hostname, validate_login, validate_migration_address
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from vrtManager.connection import connection_manager
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from vrtManager.hostdetails import wvmHostDetails
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from vrtManager.storage import wvmStorages
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class Compute(Model):
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name = CharField(_("name"), max_length=64, unique=True)
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hostname = CharField(_("hostname"), max_length=64, validators=[validate_hostname])
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login = CharField(_("login"), max_length=20, blank=True, validators=[validate_login])
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password = CharField(_("password"), max_length=14, blank=True, null=True)
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details = CharField(_("details"), max_length=64, null=True, blank=True)
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type = IntegerField()
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migration_address = CharField(
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_("migration address"),
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max_length=64,
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blank=True,
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default="",
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validators=[validate_migration_address],
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help_text=_(
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"IP address or host name the other hosts send migrating VMs to; "
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"empty: the host's own host name, which they must be able to resolve"
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),
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)
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@property
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def migration_uri(self):
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"""The native migration URI for VMs migrated to this host, or None for
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libvirt's default."""
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if not self.migration_address:
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return None
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try:
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if ip_address(self.migration_address).version == 6:
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return f"tcp://[{self.migration_address}]"
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except ValueError:
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pass
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return f"tcp://{self.migration_address}"
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@cached_property
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def status(self):
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"""True if WebVirtCloud can connect to the host (within the connect
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timeout; a host that failed recently is not tried again at once)."""
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return isinstance(self.connection, virConnect)
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@cached_property
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def connection_error(self):
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"""Why the host cannot be reached, or None."""
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return None if self.status else str(self.connection)
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@cached_property
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def connection(self):
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try:
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return connection_manager.get_connection(
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self.hostname,
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self.login,
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self.password,
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self.type,
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)
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except Exception as e:
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return e
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@cached_property
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def proxy(self):
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return wvmHostDetails(
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self.hostname,
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self.login,
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self.password,
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self.type,
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)
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@cached_property
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def cpu_count(self):
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return self.proxy.get_node_info()[3]
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@cached_property
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def ram_size(self):
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return self.proxy.get_node_info()[2]
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@cached_property
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def ram_usage(self):
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return self.proxy.get_memory_usage()["percent"]
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@cached_property
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def capacity(self):
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"""What the host has given its VMs (wvmHostDetails.get_capacity) and
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its active storage pools, or None when it cannot be read."""
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if self.status is not True:
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return None
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try:
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given = self.proxy.get_capacity()
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storages = wvmStorages(self.hostname, self.login, self.password, self.type)
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given["pools"] = [pool for pool in storages.get_storages_info() if pool["status"]]
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except libvirtError:
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return None
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return given
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def __str__(self):
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return self.name
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def delete(self, *args, **kwargs):
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"""Its VMs keep running on the host: their owners wait in tombstones,
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or follow a VM already listed on another compute. The compute is held
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exclusive, so no reconcile, VM operation or job on it runs meanwhile
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(Busy if one does); its row is locked before its VMs', as the
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reconcile does."""
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from computes.utils import forget, libvirt_compute_lock, lock_ownership
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with libvirt_compute_lock(self), transaction.atomic():
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lock_ownership()
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Compute.objects.select_for_update().filter(pk=self.pk).first()
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for inst in self.instance_set.select_for_update():
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forget(inst)
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return super().delete(*args, **kwargs)
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