CloudBender/cloudbender/stackgroup.py

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import logging
import pprint
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from .utils import dict_merge
from .jinja import read_config_file
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from .stack import Stack
logger = logging.getLogger(__name__)
class StackGroup(object):
def __init__(self, path, ctx):
self.name = None
self.ctx = ctx
self.path = path
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self.rel_path = path.relative_to(ctx["config_path"])
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self.config = {}
self.sgs = []
self.stacks = []
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if self.rel_path == ".":
self.rel_path = ""
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def dump_config(self):
for sg in self.sgs:
sg.dump_config()
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logger.debug(
"StackGroup {}: {}".format(self.rel_path, pprint.pformat(self.config))
)
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for s in self.stacks:
s.dump_config()
def read_config(self, parent_config={}, loadStacks=True):
if not self.path.is_dir():
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return None
# First read config.yaml if present
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_config = read_config_file(
self.path.joinpath("config.yaml"), parent_config.get("variables", {})
)
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# Stack Group name if not explicit via config is derived from subfolder, or in case of root object the parent folder
if "stackgroupname" in _config:
self.name = _config["stackgroupname"]
elif not self.name:
self.name = self.path.stem
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# Merge config with parent config
self.config = dict_merge(parent_config, _config)
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stackname_prefix = self.config.get("stacknameprefix", "")
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# profile and region need special treatment due to cmd line overwrite option
if self.ctx["region"]:
self.config["region"] = self.ctx["region"]
if self.ctx["profile"]:
self.config["profile"] = self.ctx["profile"]
logger.debug("StackGroup {} added.".format(self.name))
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# Add stacks
if loadStacks:
stacks = [
s for s in self.path.glob("*.yaml") if not s.name == "config.yaml"
]
for stack_path in stacks:
stackname = stack_path.name.split(".")[0]
template = stackname
if stackname_prefix:
stackname = stackname_prefix + stackname
new_stack = Stack(
name=stackname,
template=template,
path=stack_path,
rel_path=str(self.rel_path),
ctx=self.ctx,
)
new_stack.read_config(self.config)
self.stacks.append(new_stack)
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# Create StackGroups recursively
for sub_group in [s for s in self.path.iterdir() if s.is_dir()]:
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sg = StackGroup(sub_group, self.ctx)
sg.read_config(self.config, loadStacks=loadStacks)
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self.sgs.append(sg)
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def get_stacks(self, name=None, recursive=True, match_by="name"):
"""Returns [stack] matching stack_name or [all]"""
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stacks = []
if name:
logger.debug("Looking for stack {} in group {}".format(name, self.name))
for s in self.stacks:
if name:
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if match_by == "name" and s.stackname != name:
continue
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if match_by == "path" and not s.path.match(name):
continue
if self.rel_path:
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logger.debug(
"Found stack {} in group {}".format(s.stackname, self.rel_path)
)
else:
logger.debug("Found stack {}".format(s.stackname))
stacks.append(s)
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if recursive:
for sg in self.sgs:
s = sg.get_stacks(name, recursive, match_by)
if s:
stacks = stacks + s
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return stacks
def get_stackgroup(self, name=None, match_by="path"):
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"""Returns stack group matching stackgroup_name or all if None"""
if self.path.match(name):
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logger.debug("Found stack_group {}".format(self.name))
return self
if name and name != "config":
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logger.debug(
"Looking for stack_group {} in group {}".format(name, self.name)
)
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for sg in self.sgs:
s = sg.get_stackgroup(name, match_by)
if s:
return s
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return None