Source code for stacker.lookups.handlers.xref
"""Handler for fetching outputs from fully qualified stacks.
The `output` handler supports fetching outputs from stacks created within a
sigle config file. Sometimes it's useful to fetch outputs from stacks created
outside of the current config file. `xref` supports this by not using the
:class:`stacker.context.Context` to expand the fqn of the stack.
Example:
conf_value: ${xref some-fully-qualified-stack-name::SomeOutputName}
"""
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
from . import LookupHandler
from .output import deconstruct
TYPE_NAME = "xref"
[docs]class XrefLookup(LookupHandler):
[docs] @classmethod
def handle(cls, value, provider=None, **kwargs):
"""Fetch an output from the designated stack.
Args:
value (str): string with the following format:
<stack_name>::<output_name>, ie. some-stack::SomeOutput
provider (:class:`stacker.provider.base.BaseProvider`): subclass of
the base provider
Returns:
str: output from the specified stack
"""
if provider is None:
raise ValueError('Provider is required')
d = deconstruct(value)
stack_fqn = d.stack_name
output = provider.get_output(stack_fqn, d.output_name)
return output