70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
# Avoid shadowing of system copy module by copy action plugin.
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from __future__ import absolute_import
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from copy import deepcopy
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import operator
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from ansible.errors import AnsibleActionFail
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from ansible.module_utils._text import to_text
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from ansible.plugins.action import ActionBase
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from six import iteritems
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class ActionModule(ActionBase):
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def run(self, tmp=None, task_vars=None):
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"""
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Schedule specifications of VMs by flavour onto hypervisors.
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:param hypervisor_vars: A dict of hostvars for each hypervisor, keyed
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by hypervisor hostname.
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:param specs: A dict mapping flavour names to the number of VMs
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required of that flavour.
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:param flavours: A dict mapping flavour names to a dict of properties
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of that flavour.
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:param vm_name_prefix: A string with with to prefix all sequential VM
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names.
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:returns: A dict containing lists of VM details, keyed by the
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hostname of the hypervisor to which they are scheduled.
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:raises: AnsibleError if insufficient hypervisors exist to host the
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requested VMs.
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"""
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result = super(ActionModule, self).run(tmp, task_vars)
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del tmp # tmp no longer has any effect
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self._validate_vars(task_vars)
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vms = []
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idx = 0
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for flav, cnt in iteritems(task_vars['specs']):
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for _ in xrange(cnt):
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vm = deepcopy(task_vars['flavours'][flav])
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# Sequentially number the VM names.
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vm['name'] = "%s%d" % (task_vars['vm_name_prefix'], idx)
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vms.append(vm)
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idx += 1
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# TODO(w-miller): currently we just arbitrarily schedule all VMs to the
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# first hypervisor. Improve this algorithm to make it more
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# sophisticated.
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result['result'] = {task_vars['hypervisor_vars'].keys()[0]: vms}
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return result
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def _validate_vars(self, task_vars):
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if task_vars is None:
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task_vars = {}
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REQUIRED_TASK_VARS = {'hypervisor_vars', 'specs', 'flavours'}
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OPTIONAL_TASK_VARS = {('vm_name_prefix', 'vm')}
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for var in REQUIRED_TASK_VARS:
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if var not in task_vars:
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e = "The parameter '%s' must be specified." % var
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raise AnsibleActionFail(to_text(e))
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for var in OPTIONAL_TASK_VARS:
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if var[0] not in task_vars:
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task_vars[var[0]] = var[1]
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if not task_vars['hypervisor_vars']:
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e = ("There are no hosts in the 'hypervisors' group to which we "
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"can schedule.")
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raise AnsibleActionFail(to_text(e))
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