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#
# Copyright (C) 2019 Bloomberg Finance LP
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# James Ennis <james.ennis@codethink.co.uk>
from . import Element
from . import _cachekey
from ._exceptions import ArtifactElementError
from ._loader.metaelement import MetaElement
from .types import Scope
# ArtifactElement()
#
# Object to be used for directly processing an artifact
#
# Args:
# context (Context): The Context object
# ref (str): The artifact ref
#
class ArtifactElement(Element):
__instantiated_artifacts = {} # A hash of ArtifactElement by ref
def __init__(self, context, ref):
_, element, key = verify_artifact_ref(ref)
self._ref = ref
self._key = key
project = context.get_toplevel_project()
meta = MetaElement(project, element) # NOTE element has no .bst suffix
plugin_conf = None
super().__init__(context, project, meta, plugin_conf)
# _new_from_artifact_ref():
#
# Recursively instantiate a new ArtifactElement instance, and its
# dependencies from an artifact ref
#
# Args:
# ref (String): The artifact ref
# context (Context): The Context object
# task (Task): A task object to report progress to
#
# Returns:
# (ArtifactElement): A newly created Element instance
#
@classmethod
def _new_from_artifact_ref(cls, ref, context, task=None):
if ref in cls.__instantiated_artifacts:
return cls.__instantiated_artifacts[ref]
artifact_element = ArtifactElement(context, ref)
# XXX: We need to call update state as it is responsible for
# initialising an Element/ArtifactElement's Artifact (__artifact)
artifact_element._update_state()
cls.__instantiated_artifacts[ref] = artifact_element
for dep_ref in artifact_element.get_dependency_refs(Scope.BUILD):
dependency = ArtifactElement._new_from_artifact_ref(dep_ref, context, task)
artifact_element._add_build_dependency(dependency)
return artifact_element
# _clear_artifact_refs_cache()
#
# Clear the internal artifact refs cache
#
# When loading ArtifactElements from artifact refs, we cache already
# instantiated ArtifactElements in order to not have to load the same
# ArtifactElements twice. This clears the cache.
#
# It should be called whenever we are done loading all artifacts in order
# to save memory.
#
@classmethod
def _clear_artifact_refs_cache(cls):
cls.__instantiated_artifacts = {}
# Override Element.get_artifact_name()
def get_artifact_name(self, key=None):
return self._ref
# Dummy configure method
def configure(self, node):
pass
# Dummy preflight method
def preflight(self):
pass
# get_dependency_refs()
#
# Obtain the refs of a particular scope of dependencies
#
# Args:
# scope (Scope): The scope of dependencies for which we want to obtain the refs
#
# Returns:
# (list [str]): A list of artifact refs
#
def get_dependency_refs(self, scope=Scope.BUILD):
artifact = self._get_artifact()
return artifact.get_dependency_refs(deps=scope)
# configure_sandbox()
#
# Configure a sandbox for installing artifacts into
#
# Args:
# sandbox (Sandbox)
#
def configure_sandbox(self, sandbox):
install_root = self.get_variable('install-root')
# Tell the sandbox to mount the build root and install root
sandbox.mark_directory(install_root)
# Tell sandbox which directory is preserved in the finished artifact
sandbox.set_output_directory(install_root)
# Override Element._calculate_cache_key
def _calculate_cache_key(self, dependencies=None):
return self._key
# Override Element._get_cache_key()
def _get_cache_key(self, strength=None):
return self._key
# verify_artifact_ref()
#
# Verify that a ref string matches the format of an artifact
#
# Args:
# ref (str): The artifact ref
#
# Returns:
# project (str): The project's name
# element (str): The element's name
# key (str): The cache key
#
# Raises:
# ArtifactElementError if the ref string does not match
# the expected format
#
def verify_artifact_ref(ref):
try:
project, element, key = ref.split('/', 2) # This will raise a Value error if unable to split
# Explicitly raise a ValueError if the key length is not as expected
if not _cachekey.is_key(key):
raise ValueError
except ValueError:
raise ArtifactElementError("Artifact: {} is not of the expected format".format(ref))
return project, element, key
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