from functools import wraps
from fabric.decorators import _wrap_as_new
from .ec2.api import Ec2InstanceWrapper
def _list_annotating_decorator(attribute, *values):
def attach_list(func):
@wraps(func)
def inner_decorator(*args, **kwargs):
return func(*args, **kwargs)
_values = values
# Allow for single iterable argument as well as *args
if len(_values) == 1 and not isinstance(_values[0], basestring):
_values = _values[0]
setattr(inner_decorator, attribute, list(_values))
# Don't replace @task new-style task objects with inner_decorator by
# itself -- wrap in a new Task object first.
inner_decorator = _wrap_as_new(func, inner_decorator)
return inner_decorator
return attach_list
[docs]def ec2instance(nametag=None, instanceid=None, tags=None, region=None):
"""
Wraps the decorated function to execute as if it had been invoked with
``--ec2names`` or ``--ec2ids``.
"""
if instanceid:
instancewrappers = [Ec2InstanceWrapper.get_by_instanceid(instanceid)]
elif nametag:
instancewrappers = [Ec2InstanceWrapper.get_by_nametag(nametag)]
elif tags:
instancewrappers = Ec2InstanceWrapper.get_by_tagvalue(tags, region)
else:
raise ValueError('nametag, instanceid, or tags must be supplied.')
return _list_annotating_decorator('hosts', [instancewrapper['public_dns_name']
for instancewrapper in instancewrappers])