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# distbuild/serialise.py -- (de)serialise Artifact object graphs
#
# Copyright (C) 2012, 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
import logging
def serialise_artifact(artifact):
'''Serialise an Artifact object and its dependencies into string form.'''
def encode_morphology(morphology):
return morphology.data
def encode_source(source, artifacts):
source_dic = {
'name': source.name,
'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,
'cache_id': source.cache_id,
'cache_key': source.cache_key,
'dependencies': [str(id(artifacts[id(d)]))
for d in source.dependencies],
# dict keys are converted to strings by json
# so we encode the artifact ids as strings
'artifact_ids': [str(id(artifact)) for (_, artifact)
in source.artifacts.iteritems()],
}
if source.morphology['kind'] == 'chunk':
source_dic['build_mode'] = source.build_mode
source_dic['prefix'] = source.prefix
return source_dic
def encode_artifact(a, source_id):
return {
'source_id': source_id,
'name': a.name,
}
artifacts = {}
encoded_artifacts = {}
encoded_sources = {}
for a in artifact.walk():
if id(a.source) not in encoded_sources:
#if a.source.morphology['kind'] == 'chunk':
if True:
for (_, sa) in a.source.artifacts.iteritems():
if id(sa) not in artifacts:
artifacts[id(sa)] = sa
encoded_artifacts[id(sa)] = encode_artifact(sa,
id(a.source))
#else:
# We create separate sources for strata and systems,
# this is a bit of a hack, but needed to allow
# us to build strata and systems independently
#s = a.source
#t = morphlib.source.Source(s.repo_name, s.original_ref,
# s.sha1, s.tree, s.morphology, s.filename)
#t.artifacts = {a.name: a}
#a.source = t
encoded_sources[id(a.source)] = encode_source(a.source, artifacts)
if id(a) not in artifacts:
artifacts[id(a)] = a
encoded_artifacts[id(a)] = encode_artifact(a, id(a.source))
encoded_artifacts['_root'] = str(id(artifact))
return json.dumps({'sources': encoded_sources,
'artifacts': encoded_artifacts})
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):
return morphlib.morphology.Morphology(le_dict)
def decode_source(le_dict):
'''Convert a dict into a Source object.
Do not set dependencies, that will be dealt with later.
'''
morphology = decode_morphology(le_dict['morphology'])
sources = morphlib.source.make_sources(le_dict['repo_name'],
le_dict['original_ref'],
le_dict['filename'],
le_dict['sha1'],
le_dict['tree'],
morphology)
# The above function creates all sources produced by one morphology,
# but we're only deserialising one of them. Find it.
for source in sources:
if source.name == le_dict['name']:
break
else:
raise ValueError(
"Didn't find source %s for %s." % (le_dict['name'],
le_dict['filename']))
source.cache_id = le_dict['cache_id']
source.cache_key = le_dict['cache_key']
if morphology['kind'] == 'chunk':
source.build_mode = le_dict['build_mode']
source.prefix = le_dict['prefix']
return source
def decode_artifact(artifact_dict, source):
'''Convert dict into an Artifact object.'''
artifact = morphlib.artifact.Artifact(source, artifact_dict['name'])
#artifact.arch = artifact_dict['arch']
return artifact
le_dicts = json.loads(encoded)
artifacts_dict = le_dicts['artifacts']
sources_dict = le_dicts['sources']
source_ids = [sid for sid in sources_dict.keys()]
artifacts = {}
sources = {}
for source_id in source_ids:
source_dict = sources_dict[source_id]
sources[source_id] = decode_source(source_dict)
# clear the source artifacts that get automatically generated
# we want to add the ones that were sent to us
sources[source_id].artifacts = {}
source_artifacts = source_dict['artifact_ids']
for artifact_id in source_artifacts:
if artifact_id not in artifacts:
artifact_dict = artifacts_dict[artifact_id]
artifact = decode_artifact(artifact_dict, sources[source_id])
artifacts[artifact_id] = artifact
key = artifacts[artifact_id].name
sources[source_id].artifacts[key] = artifacts[artifact_id]
sources[source_id].dependencies = [artifacts_dict[aid] for aid in
source_dict['dependencies']]
return artifacts[artifacts_dict['_root']]
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