mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-08 19:26:48 +00:00
e7361561aa
Under each host's CPU and memory load, the dialog shows one line: Given to VMs: 24 vCPUs (1.5:1), 48.0 GB memory. Pool default: 120.0 GB free. The line is read when the dialog opens, from computes/<id>/capacity/, as plain text, so the VM list itself reads no VM definitions. The CPU bars and the lines share one queue, host by host and two reads at a time, as each read holds a worker. A host that cannot be read says so. Compute.capacity now also gives the vCPUs per CPU and its pools with the default one first, so the Computes page and the dialog share them.
124 lines
4.5 KiB
Python
124 lines
4.5 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), its
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vCPUs per CPU, and its active storage pools, the default one first; or
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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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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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given["ratio"] = given["vcpus"]["all"] / given["cpus"] if given["cpus"] else 0
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given["pools"] = sorted(pools, key=lambda pool: (pool["name"] != "default", pool["name"]))
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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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