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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 yaml
import morphlib
import logging
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]
return result
def encode_source(source, prune_leaf=False):
source_dic = {
'name': source.name,
'repo': None,
'repo_name': source.repo_name,
'original_ref': source.original_ref,
'sha1': source.sha1,
'tree': source.tree,
'morphology': id(source.morphology),
'filename': source.filename,
'artifact_ids': [],
'cache_id': source.cache_id,
'cache_key': source.cache_key,
'dependencies': [],
}
if not prune_leaf:
source_dic['artifact_ids'].extend(id(artifact) for (_, artifact)
in source.artifacts.iteritems())
source_dic['dependencies'].extend(id(d)
for d in source.dependencies)
if source.morphology['kind'] == 'chunk':
source_dic['build_mode'] = source.build_mode
source_dic['prefix'] = source.prefix
return source_dic
def encode_artifact(a):
if artifact.source.morphology['kind'] == 'system': # pragma: no cover
arch = artifact.source.morphology['arch']
else:
arch = artifact.arch
return {
'source_id': id(a.source),
'name': a.name,
'arch': arch,
'dependents': [id(d)
for d in a.dependents],
}
encoded_artifacts = {}
encoded_sources = {}
encoded_morphologies = {}
visited_artifacts = {}
for a in artifact.walk():
if id(a.source) not in encoded_sources:
for sa in a.source.artifacts.itervalues():
if id(sa) not in encoded_artifacts:
visited_artifacts[id(sa)] = sa
encoded_artifacts[id(sa)] = encode_artifact(sa)
encoded_morphologies[id(a.source.morphology)] = \
encode_morphology(a.source.morphology)
encoded_sources[id(a.source)] = encode_source(a.source)
if id(a) not in encoded_artifacts: # pragma: no cover
visited_artifacts[id(a)] = a
encoded_artifacts[id(a)] = encode_artifact(a)
# Include one level of dependents above encoded artifacts, as we need
# them to be able to tell whether two sources are in the same stratum.
for a in visited_artifacts.itervalues():
for source in a.dependents: # pragma: no cover
if id(source) not in encoded_sources:
encoded_morphologies[id(source.morphology)] = \
encode_morphology(source.morphology)
encoded_sources[id(source)] = \
encode_source(source, prune_leaf=True)
content = {
'sources': encoded_sources,
'artifacts': encoded_artifacts,
'morphologies': encoded_morphologies,
'root_artifact': id(artifact),
'default_split_rules': {
'chunk': morphlib.artifactsplitrule.DEFAULT_CHUNK_RULES,
'stratum': morphlib.artifactsplitrule.DEFAULT_STRATUM_RULES,
},
}
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.
'''
def decode_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.
'''
return morphlib.morphology.Morphology(le_dict)
def decode_source(le_dict, morphology, split_rules):
'''Convert a dict into a Source object.'''
source = morphlib.source.Source(le_dict['name'],
le_dict['repo_name'],
le_dict['original_ref'],
le_dict['sha1'],
le_dict['tree'],
morphology,
le_dict['filename'],
split_rules)
if morphology['kind'] == 'chunk':
source.build_mode = le_dict['build_mode']
source.prefix = le_dict['prefix']
source.cache_id = le_dict['cache_id']
source.cache_key = le_dict['cache_key']
return source
def decode_artifact(artifact_dict, source):
'''Convert dict into an Artifact object.
Do not set dependencies, that will be dealt with later.
'''
artifact = morphlib.artifact.Artifact(source, artifact_dict['name'])
artifact.arch = artifact_dict['arch']
artifact.source = source
return artifact
le_dicts = yaml.load(json.loads(encoded))
artifacts_dict = le_dicts['artifacts']
sources_dict = le_dicts['sources']
morphologies_dict = le_dicts['morphologies']
root_artifact = le_dicts['root_artifact']
assert root_artifact in artifacts_dict
artifacts = {}
sources = {}
morphologies = {id: decode_morphology(d)
for (id, d) in morphologies_dict.iteritems()}
# Decode sources
for source_id, source_dict in sources_dict.iteritems():
morphology = morphologies[source_dict['morphology']]
kind = morphology['kind']
ruler = getattr(morphlib.artifactsplitrule, 'unify_%s_matches' % kind)
if kind in ('chunk', 'stratum'):
rules = ruler(morphology, le_dicts['default_split_rules'][kind])
else: # pragma: no cover
rules = ruler(morphology)
sources[source_id] = decode_source(source_dict, morphology, rules)
# decode artifacts
for artifact_id, artifact_dict in artifacts_dict.iteritems():
source_id = artifact_dict['source_id']
source = sources[source_id]
artifact = decode_artifact(artifact_dict, source)
artifacts[artifact_id] = artifact
# add source artifacts reference
for source_id, source in sources.iteritems():
source_dict = sources_dict[source_id]
source.artifacts = {artifacts[a].name: artifacts[a]
for a in source_dict['artifact_ids']}
# add source dependencies
for source_id, source_dict in sources_dict.iteritems():
source = sources[source_id]
source.dependencies = [artifacts[aid]
for aid in source_dict['dependencies']]
# add artifact dependents
for artifact_id, artifact in artifacts.iteritems():
artifact_dict = artifacts_dict[artifact_id]
artifact.dependents = [sources[sid]
for sid in artifact_dict['dependents']]
return artifacts[root_artifact]
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