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# distbuild/artifact_reference.py -- Decode/encode ArtifactReference objects
#
# Copyright (C) 2012, 2014-2015 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
import json
import logging
import yaml
import morphlib
class ArtifactReference(object): # pragma: no cover
'''Container for some basic information about an artifact.'''
def __init__(self, basename, encoded):
self._basename = basename
self._dict = encoded
def __str__(self):
return self._basename
def __repr__(self):
return '<ArtifactReference: %s>' % self._basename
def __getattr__(self, name):
if not name.startswith('_'):
return self._dict[name]
else:
super(ArtifactReference, self).__getattr__(name)
def __setattr__(self, name, val):
if not name.startswith('_'):
self._dict[name] = val
else:
super(ArtifactReference, self).__setattr__(name, val)
def basename(self):
return self._basename
def walk(self):
done = set()
def depth_first(a):
if a not in done:
done.add(a)
for dep in a.dependencies:
for ret in depth_first(dep):
yield ret
yield a
return list(depth_first(self))
def encode_artifact(artifact, repo, ref):
'''Encode part of an Artifact object and dependencies into string form.'''
def get_source_dict(source):
source_dict = {
'filename': source.filename,
'kind': source.morphology['kind'],
'source_name': source.name,
'source_repo': source.repo_name,
'source_ref': source.original_ref,
'source_sha1': source.sha1,
'source_artifact_names': [],
'dependencies': []
}
for dependency in source.dependencies:
source_dict['dependencies'].append(dependency.basename())
for source_artifact_name in source.artifacts:
source_dict['source_artifact_names'].append(source_artifact_name)
return source_dict
def get_artifact_dict(a):
if artifact.source.morphology['kind'] == 'system': # pragma: no cover
arch = artifact.source.morphology['arch']
else:
arch = artifact.arch
a_dict = {
'arch': arch,
'cache_key': a.source.cache_key,
'name': a.name,
'repo': repo,
'ref': ref,
}
return a_dict
encoded_artifacts = {}
encoded_sources = {}
root_filename = artifact.source.filename
for a in artifact.walk():
if a.basename() not in encoded_artifacts: # pragma: no cover
encoded_artifacts[a.basename()] = get_artifact_dict(a)
encoded_sources[a.source.cache_key] = get_source_dict(a.source)
content = {
'root-artifact': artifact.basename(),
'root-filename': root_filename,
'artifacts': encoded_artifacts,
'sources': encoded_sources
}
return json.dumps(yaml.dump(content))
def encode_artifact_reference(artifact): # pragma: no cover
'''Encode an ArtifactReference object into string form.
The ArtifactReference object is encoded such that it can be recreated by
``decode_artifact_reference``.
'''
artifact_dict = {
'arch': artifact.arch,
'cache_key': artifact.cache_key,
'name': artifact.name,
'repo': artifact.repo,
'ref': artifact.ref
}
source_dict = {
'filename': artifact.filename,
'kind': artifact.kind,
'source_name': artifact.source_name,
'source_repo': artifact.source_repo,
'source_ref': artifact.source_ref,
'source_sha1': artifact.source_sha1,
'source_artifact_names': [],
'dependencies': []
}
for dependency in artifact.dependencies:
source_dict['dependencies'].append(dependency.basename())
for source_artifact_name in artifact.source_artifact_names:
source_dict['source_artifact_names'].append(source_artifact_name)
content = {
'root-artifact': artifact.basename(),
'root-filename': artifact.root_filename,
'artifacts': {artifact.basename(): artifact_dict},
'sources': {artifact.cache_key: source_dict}
}
return json.dumps(yaml.dump(content))
def decode_artifact_reference(encoded):
'''Decode an ArtifactReference object from `encoded`.
The argument should be a string returned by ``encode_artifact``
or ``encode_artifact_reference``. The decoded ArtifactReference
object will be sufficient to represent a build graph and contain
enough information to allow `morph worker-build` to calculate a
build graph and find the original Artifact object it needs to
build.
'''
content = yaml.load(json.loads(encoded))
root = content['root-artifact']
encoded_artifacts = content['artifacts']
encoded_sources = content['sources']
artifacts = {}
# decode artifacts
for basename, artifact_dict in encoded_artifacts.iteritems():
artifact_dict.update(encoded_sources[artifact_dict['cache_key']])
artifact = ArtifactReference(basename, artifact_dict)
artifact.root_filename = content['root-filename']
artifacts[basename] = artifact
# add dependencies
for basename, a_dict in encoded_artifacts.iteritems():
artifact = artifacts[basename]
artifact.dependencies = [artifacts.get(dep)
for dep in artifact.dependencies]
return artifacts[root]
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