Source code for stacker.context

from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
from builtins import object
import collections
import logging

from stacker.config import Config
from .stack import Stack
from .target import Target

logger = logging.getLogger(__name__)


DEFAULT_NAMESPACE_DELIMITER = "-"
DEFAULT_TEMPLATE_INDENT = 4


[docs]def get_fqn(base_fqn, delimiter, name=None): """Return the fully qualified name of an object within this context. If the name passed already appears to be a fully qualified name, it will be returned with no further processing. """ if name and name.startswith("%s%s" % (base_fqn, delimiter)): return name return delimiter.join([_f for _f in [base_fqn, name] if _f])
[docs]class Context(object): """The context under which the current stacks are being executed. The stacker Context is responsible for translating the values passed in via the command line and specified in the config to `Stack` objects. Args: environment (dict): A dictionary used to pass in information about the environment. Useful for templating. stack_names (list): A list of stack_names to operate on. If not passed, usually all stacks defined in the config will be operated on. config (:class:`stacker.config.Config`): The stacker configuration being operated on. force_stacks (list): A list of stacks to force work on. Used to work on locked stacks. """ def __init__(self, environment=None, stack_names=None, config=None, force_stacks=None): self.environment = environment self.stack_names = stack_names or [] self.config = config or Config() self.force_stacks = force_stacks or [] self.hook_data = {} @property def namespace(self): return self.config.namespace @property def namespace_delimiter(self): delimiter = self.config.namespace_delimiter if delimiter is not None: return delimiter return DEFAULT_NAMESPACE_DELIMITER @property def template_indent(self): indent = self.config.template_indent if indent is not None: return int(indent) return DEFAULT_TEMPLATE_INDENT @property def bucket_name(self): if not self.upload_templates_to_s3: return None return self.config.stacker_bucket \ or "stacker-%s" % (self.get_fqn(),) @property def upload_templates_to_s3(self): # Don't upload stack templates to S3 if `stacker_bucket` is explicitly # set to an empty string. if self.config.stacker_bucket == '': logger.debug("Not uploading templates to s3 because " "`stacker_bucket` is explicity set to an " "empty string") return False # If no namespace is specificied, and there's no explicit stacker # bucket specified, don't upload to s3. This makes sense because we # can't realistically auto generate a stacker bucket name in this case. if not self.namespace and not self.config.stacker_bucket: logger.debug("Not uploading templates to s3 because " "there is no namespace set, and no " "stacker_bucket set") return False return True @property def tags(self): tags = self.config.tags if tags is not None: return tags if self.namespace: return {"stacker_namespace": self.namespace} return {} @property def _base_fqn(self): return self.namespace.replace(".", "-").lower() @property def mappings(self): return self.config.mappings or {} def _get_stack_definitions(self): return self.config.stacks
[docs] def get_targets(self): """Returns the named targets that are specified in the config. Returns: list: a list of :class:`stacker.target.Target` objects """ if not hasattr(self, "_targets"): targets = [] for target_def in self.config.targets or []: target = Target(target_def) targets.append(target) self._targets = targets return self._targets
[docs] def get_stacks(self): """Get the stacks for the current action. Handles configuring the :class:`stacker.stack.Stack` objects that will be used in the current action. Returns: list: a list of :class:`stacker.stack.Stack` objects """ if not hasattr(self, "_stacks"): stacks = [] definitions = self._get_stack_definitions() for stack_def in definitions: stack = Stack( definition=stack_def, context=self, mappings=self.mappings, force=stack_def.name in self.force_stacks, locked=stack_def.locked, enabled=stack_def.enabled, protected=stack_def.protected, ) stacks.append(stack) self._stacks = stacks return self._stacks
[docs] def get_stack(self, name): for stack in self.get_stacks(): if stack.name == name: return stack
[docs] def get_stacks_dict(self): return dict((stack.fqn, stack) for stack in self.get_stacks())
[docs] def get_fqn(self, name=None): """Return the fully qualified name of an object within this context. If the name passed already appears to be a fully qualified name, it will be returned with no further processing. """ return get_fqn(self._base_fqn, self.namespace_delimiter, name)
[docs] def set_hook_data(self, key, data): """Set hook data for the given key. Args: key(str): The key to store the hook data in. data(:class:`collections.Mapping`): A dictionary of data to store, as returned from a hook. """ if not isinstance(data, collections.Mapping): raise ValueError("Hook (key: %s) data must be an instance of " "collections.Mapping (a dictionary for " "example)." % key) if key in self.hook_data: raise KeyError("Hook data for key %s already exists, each hook " "must have a unique data_key.", key) self.hook_data[key] = data