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# distbuild/serialise.py -- (de)serialise Artifact object graphs
#
# 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 __getattr__(self, name):
if not name.startswith('_'):
return self._dict.get(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 serialise_artifact(artifact, repo, ref):
'''Serialise an Artifact object and its dependencies into string form.'''
def encode_source(source):
s_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_artifacts': [],
'dependencies': []
}
for dep in source.dependencies:
s_dict['dependencies'].append(dep.basename())
for sa in source.artifacts:
s_dict['source_artifacts'].append(sa)
return s_dict
def encode_artifact(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
def encode_artifact_reference(a): # pragma: no cover
a_dict = {
'arch': a.arch,
'cache_key': a.cache_key,
'name': a.name,
'repo': a.repo,
'ref': a.ref
}
s_dict = {
'filename': a.filename,
'kind': a.kind,
'source_name': a.source_name,
'source_repo': a.source_repo,
'source_ref': a.source_ref,
'source_sha1': a.source_sha1,
'source_artifacts': [],
'dependencies': []
}
for dep in a.dependencies:
s_dict['dependencies'].append(dep.basename())
for sa in a.source_artifacts:
s_dict['source_artifacts'].append(sa)
return a_dict, s_dict
encoded_artifacts = {}
encoded_sources = {}
if isinstance(artifact, ArtifactReference): # pragma: no cover
root_filename = artifact.root_filename
a_dict, s_dict = encode_artifact_reference(artifact)
encoded_artifacts[artifact.basename()] = a_dict
encoded_sources[artifact.cache_key] = s_dict
else:
root_filename = artifact.source.filename
for a in artifact.walk():
if a.basename() not in encoded_artifacts: # pragma: no cover
encoded_artifacts[a.basename()] = encode_artifact(a)
encoded_sources[a.source.cache_key] = encode_source(a.source)
content = {
'root-artifact': artifact.basename(),
'root-filename': root_filename,
'artifacts': encoded_artifacts,
'sources': encoded_sources
}
return json.dumps(yaml.dump(content))
def deserialise_artifact(encoded):
'''Re-construct the Artifact object (and dependencies).
The argument should be a string returned by ``serialise_artifact``.
The reconstructed Artifact objects will be sufficiently like the
originals that they can be used as a build graph, and other such
purposes, by Morph.
'''
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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