mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-08 19:26:48 +00:00
a0a31cd3f2
libvirt measures a pool's size and free space only when the pool is refreshed and keeps those figures until the next refresh. The pool lists read them without a refresh, so they showed a pool's space as of whenever libvirt last refreshed it: two hosts sharing one pool's storage told different free space for it, each its own refresh's. On a test host, a 1 GiB file left libvirt's free space unchanged while df showed 1 GiB less, until the pool was refreshed. get_storages_info refreshes each active pool before reading it; a refresh libvirt refuses (while a volume is cloned in the pool) leaves the last figures, as the pool pages already do. A refresh scans the pool's volumes, so pools are read only where one host's are shown: a host's overview (views.host_pools, its Storage card) and its Storages page and API. The Computes list and the new-VM dialog's host lines, which read every host at once, no longer show pools; Compute.capacity is the vCPUs and memory given.
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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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=32, blank=True, validators=[validate_login])
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password = CharField(_("password"), max_length=255, 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 vCPUs per CPU; or None when the host cannot be read. Not its
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pools: their space is measured by a refresh that scans each pool,
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too slow for pages that read every host (computes.views.host_pools)."""
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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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except libvirtError:
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return None
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given["ratio"] = given["vcpus"]["all"] / given["cpus"] if given["cpus"] else 0
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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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