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# distbuild/serialise.py -- (de)serialise Artifact object graphs
#
# Copyright (C) 2014 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA..
import json
import morphlib
morphology_attributes = [
'needs_artifact_metadata_cached',
]
def serialise_artifact(artifact):
'''Serialise an Artifact object and its dependencies into string form.'''
def encode_morphology(morphology):
result = {}
for key in morphology.keys():
result[key] = morphology[key]
for x in morphology_attributes:
result['__%s' % x] = getattr(morphology, x)
return result
def encode_source(source):
source_dic = {
'repo': None,
'repo_name': source.repo_name,
'original_ref': source.original_ref,
'sha1': source.sha1,
'tree': source.tree,
'morphology': encode_morphology(source.morphology),
'filename': source.filename,
}
if source.morphology['kind'] == 'chunk':
source_dic['build_mode'] = source.build_mode
source_dic['prefix'] = source.prefix
return source_dic
def encode_single_artifact(a, encoded):
if artifact.source.morphology['kind'] == 'system':
arch = artifact.source.morphology['arch']
else:
arch = artifact.arch
return {
'source': encode_source(a.source),
'name': a.name,
'cache_id': a.cache_id,
'cache_key': a.cache_key,
'dependencies': [encoded[d.cache_key]['cache_key']
for d in a.dependencies],
'arch': arch,
}
visited = set()
def traverse(a):
visited.add(a)
for dep in a.dependencies:
if dep in visited:
continue
for ret in traverse(dep):
yield ret
yield a
encoded = {}
for a in traverse(artifact):
if a.cache_key not in encoded:
encoded[a.cache_key] = encode_single_artifact(a, encoded)
encoded['_root'] = artifact.cache_key
return json.dumps(encoded)
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.
'''
def unserialise_morphology(le_dict):
'''Convert a dict into something that kinda acts like a Morphology.
As it happens, we don't need the full Morphology so we cheat.
Cheating is good.
'''
class FakeMorphology(dict):
def get_commands(self, which):
'''Get commands to run from a morphology or build system'''
if self[which] is None:
attr = '_'.join(which.split('-'))
bs = morphlib.buildsystem.lookup_build_system(
self['build-system'])
return getattr(bs, attr)
else:
return self[which]
morphology = FakeMorphology(le_dict)
for x in morphology_attributes:
setattr(morphology, x, le_dict['__%s' % x])
del morphology['__%s' % x]
return morphology
def unserialise_source(le_dict):
'''Convert a dict into a Source object.'''
morphology = unserialise_morphology(le_dict['morphology'])
source = morphlib.source.Source(le_dict['repo_name'],
le_dict['original_ref'],
le_dict['sha1'],
le_dict['tree'],
morphology,
le_dict['filename'])
if morphology['kind'] == 'chunk':
source.build_mode = le_dict['build_mode']
source.prefix = le_dict['prefix']
return source
def unserialise_single_artifact(le_dict):
'''Convert dict into an Artifact object.
Do not set dependencies, that will be dealt with later.
'''
source = unserialise_source(le_dict['source'])
artifact = morphlib.artifact.Artifact(source, le_dict['name'])
artifact.cache_id = le_dict['cache_id']
artifact.cache_key = le_dict['cache_key']
artifact.arch = le_dict['arch']
return artifact
le_dicts = json.loads(encoded)
cache_keys = [k for k in le_dicts.keys() if k != '_root']
artifacts = {}
for cache_key in cache_keys:
le_dict = le_dicts[cache_key]
artifacts[cache_key] = unserialise_single_artifact(le_dict)
for cache_key in cache_keys:
le_dict = le_dicts[cache_key]
artifact = artifacts[cache_key]
artifact.dependencies = [artifacts[k] for k in le_dict['dependencies']]
return artifacts[le_dicts['_root']]
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