88 lines
3.4 KiB
Python
88 lines
3.4 KiB
Python
# Copyright (c) 2011 Openstack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import nova.scheduler
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from nova.scheduler.filters import abstract_filter
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class InstanceTypeFilter(abstract_filter.AbstractHostFilter):
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"""HostFilter hard-coded to work with InstanceType records."""
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def instance_type_to_filter(self, instance_type):
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"""Use instance_type to filter hosts."""
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return (self._full_name(), instance_type)
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def _satisfies_extra_specs(self, capabilities, instance_type):
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"""Check that the capabilities provided by the compute service
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satisfy the extra specs associated with the instance type"""
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if 'extra_specs' not in instance_type:
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return True
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# NOTE(lorinh): For now, we are just checking exact matching on the
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# values. Later on, we want to handle numerical
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# values so we can represent things like number of GPU cards
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try:
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for key, value in instance_type['extra_specs'].iteritems():
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if capabilities[key] != value:
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return False
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except KeyError:
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return False
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return True
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def filter_hosts(self, zone_manager, query):
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"""Return a list of hosts that can create instance_type."""
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instance_type = query
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selected_hosts = []
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for host, services in zone_manager.service_states.iteritems():
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capabilities = services.get('compute', {})
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if not capabilities:
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continue
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host_ram_mb = capabilities['host_memory_free']
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disk_bytes = capabilities['disk_available']
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spec_ram = instance_type['memory_mb']
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spec_disk = instance_type['local_gb']
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extra_specs = instance_type['extra_specs']
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if ((host_ram_mb >= spec_ram) and (disk_bytes >= spec_disk) and
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self._satisfies_extra_specs(capabilities, instance_type)):
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selected_hosts.append((host, capabilities))
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return selected_hosts
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# host entries (currently) are like:
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# {'host_name-description': 'Default install of XenServer',
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# 'host_hostname': 'xs-mini',
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# 'host_memory_total': 8244539392,
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# 'host_memory_overhead': 184225792,
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# 'host_memory_free': 3868327936,
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# 'host_memory_free_computed': 3840843776,
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# 'host_other_config': {},
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# 'host_ip_address': '192.168.1.109',
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# 'host_cpu_info': {},
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# 'disk_available': 32954957824,
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# 'disk_total': 50394562560,
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# 'disk_used': 17439604736,
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# 'host_uuid': 'cedb9b39-9388-41df-8891-c5c9a0c0fe5f',
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# 'host_name_label': 'xs-mini'}
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# instance_type table has:
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# name = Column(String(255), unique=True)
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# memory_mb = Column(Integer)
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# vcpus = Column(Integer)
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# local_gb = Column(Integer)
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# flavorid = Column(Integer, unique=True)
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# swap = Column(Integer, nullable=False, default=0)
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# rxtx_quota = Column(Integer, nullable=False, default=0)
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# rxtx_cap = Column(Integer, nullable=False, default=0)
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