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package.py
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package.py
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import datetime
from calendar import timegm
import logging
logger = logging.getLogger(__name__)
from sqlalchemy.sql import select, and_, union, or_
from sqlalchemy import orm
from sqlalchemy import types, Column, Table
from pylons import config
import vdm.sqlalchemy
import meta
import core
import license as _license
import types as _types
import domain_object
import activity
import extension
import ckan.misc
import ckan.lib.dictization
__all__ = ['Package', 'package_table', 'package_revision_table',
'PACKAGE_NAME_MAX_LENGTH', 'PACKAGE_NAME_MIN_LENGTH',
'PACKAGE_VERSION_MAX_LENGTH', 'PackageTagRevision', 'PackageRevision']
PACKAGE_NAME_MAX_LENGTH = 100
PACKAGE_NAME_MIN_LENGTH = 2
PACKAGE_VERSION_MAX_LENGTH = 100
## Our Domain Object Tables
package_table = Table('package', meta.metadata,
Column('id', types.UnicodeText, primary_key=True, default=_types.make_uuid),
Column('name', types.Unicode(PACKAGE_NAME_MAX_LENGTH),
nullable=False, unique=True),
Column('title', types.UnicodeText),
Column('version', types.Unicode(PACKAGE_VERSION_MAX_LENGTH)),
Column('url', types.UnicodeText),
Column('author', types.UnicodeText),
Column('author_email', types.UnicodeText),
Column('maintainer', types.UnicodeText),
Column('maintainer_email', types.UnicodeText),
Column('notes', types.UnicodeText),
Column('license_id', types.UnicodeText),
Column('type', types.UnicodeText),
)
vdm.sqlalchemy.make_table_stateful(package_table)
package_revision_table = core.make_revisioned_table(package_table)
## -------------------
## Mapped classes
class Package(vdm.sqlalchemy.RevisionedObjectMixin,
vdm.sqlalchemy.StatefulObjectMixin,
domain_object.DomainObject):
text_search_fields = ['name', 'title']
def __init__(self, **kw):
from ckan import model
super(Package, self).__init__(**kw)
resource_group = model.ResourceGroup(label="default")
self.resource_groups.append(resource_group)
@classmethod
def search_by_name(cls, text_query):
text_query = text_query
return meta.Session.query(cls).filter(cls.name.contains(text_query.lower()))
@classmethod
def get(cls, reference):
'''Returns a package object referenced by its id or name.'''
query = meta.Session.query(cls).filter(cls.id==reference)
query = query.options(orm.eagerload_all('package_tags.tag'))
query = query.options(orm.eagerload_all('resource_groups_all.resources_all'))
pkg = query.first()
if pkg == None:
pkg = cls.by_name(reference)
return pkg
# Todo: Make sure package names can't be changed to look like package IDs?
@property
def resources(self):
if len(self.resource_groups_all) == 0:
return []
assert len(self.resource_groups_all) == 1, "can only use resources on packages if there is only one resource_group"
return self.resource_groups_all[0].resources
def update_resources(self, res_dicts, autoflush=True):
'''Change this package\'s resources.
@param res_dicts - ordered list of dicts, each detailing a resource
The resource dictionaries contain 'url', 'format' etc. Optionally they
can also provide the 'id' of the Resource, to help matching
res_dicts to existing Resources. Otherwise, it searches
for an otherwise exactly matching Resource.
The caller is responsible for creating a revision and committing.'''
from ckan import model
assert isinstance(res_dicts, (list, tuple))
# Map the incoming res_dicts (by index) to existing resources
index_to_res = {}
# Match up the res_dicts by id
def get_resource_identity(resource_obj_or_dict):
if isinstance(resource_obj_or_dict, dict):
# Convert dict into a Resource object, since that ensures
# all columns exist when you redictize it. This object is
# garbage collected as it isn't added to the Session.
res_keys = set(resource_obj_or_dict.keys()) - \
set(('id', 'position'))
res_dict = dict([(res_key, resource_obj_or_dict[res_key]) \
for res_key in res_keys])
resource = model.Resource(**res_dict)
else:
resource = resource_obj_or_dict
res_dict = resource.as_dict(core_columns_only=True)
del res_dict['created']
return res_dict
existing_res_identites = [get_resource_identity(res) \
for res in self.resources]
for i, res_dict in enumerate(res_dicts):
assert isinstance(res_dict, dict)
id = res_dict.get('id')
if id:
res = meta.Session.query(model.Resource).autoflush(autoflush).get(id)
if res:
index_to_res[i] = res
else:
res_identity = get_resource_identity(res_dict)
try:
matching_res_index = existing_res_identites.index(res_identity)
except ValueError:
continue
index_to_res[i] = self.resources[matching_res_index]
# Edit resources and create the new ones
new_res_list = []
for i, res_dict in enumerate(res_dicts):
if i in index_to_res:
res = index_to_res[i]
for col in set(res_dict.keys()) - set(('id', 'position')):
setattr(res, col, res_dict[col])
else:
# ignore particular keys that disrupt creation of new resource
for key in set(res_dict.keys()) & set(('id', 'position')):
del res_dict[key]
res = model.Resource(**res_dict)
meta.Session.add(res)
new_res_list.append(res)
self.resource_groups[0].resources = new_res_list
def related_packages(self):
return [self]
def add_resource(self, url, format=u'', description=u'', hash=u'', **kw):
import resource
self.resources.append(resource.Resource(
resource_group_id=self.resource_groups[0].id,
url=url,
format=format,
description=description,
hash=hash,
**kw))
def add_tag(self, tag):
import ckan.model as model
if tag in self.get_tags(tag.vocabulary):
return
else:
package_tag = model.PackageTag(self, tag)
meta.Session.add(package_tag)
def add_tags(self, tags):
for tag in tags:
self.add_tag(tag)
def add_tag_by_name(self, tag_name, vocab=None, autoflush=True):
"""Add a tag with the given name to this package's tags.
By default the given tag_name will be searched for among the free tags
(tags which do not belong to any vocabulary) only. If the optional
argument `vocab` is given then the named vocab will be searched for the
tag name instead.
If no tag with the given name is found, one will be created. If the
optional argument vocab is given and there is no tag with the given
name in the given vocabulary, then a new tag will be created and added
to the vocabulary.
"""
from tag import Tag
if not tag_name:
return
# Get the named tag.
tag = Tag.by_name(tag_name, vocab=vocab, autoflush=autoflush)
if not tag:
# Tag doesn't exist yet, make a new one.
if vocab:
tag = Tag(name=tag_name, vocabulary_id=vocab.id)
else:
tag = Tag(name=tag_name)
assert tag is not None
self.add_tag(tag)
def get_tags(self, vocab=None):
"""Return a sorted list of this package's tags
Tags are sorted by their names.
"""
import ckan.model as model
query = meta.Session.query(model.Tag)
query = query.join(model.PackageTagRevision)
query = query.filter(model.PackageTagRevision.tag_id == model.Tag.id)
query = query.filter(model.PackageTagRevision.package_id == self.id)
query = query.filter(and_(
model.PackageTagRevision.state == 'active',
model.PackageTagRevision.current == True))
if vocab:
query = query.filter(model.Tag.vocabulary_id == vocab.id)
else:
query = query.filter(model.Tag.vocabulary_id == None)
query = query.order_by(model.Tag.name)
tags = query.all()
return tags
def remove_tag(self, tag):
import ckan.model as model
query = meta.Session.query(model.PackageTag)
query = query.filter(model.PackageTag.package_id == self.id)
query = query.filter(model.PackageTag.tag_id == tag.id)
package_tag = query.one()
package_tag.delete()
meta.Session.commit()
def isopen(self):
if self.license and self.license.isopen():
return True
return False
def get_average_rating(self):
total = 0
for rating in self.ratings:
total += rating.rating
if total == 0:
return None
else:
return total / len(self.ratings)
def as_dict(self, ref_package_by='name', ref_group_by='name'):
_dict = domain_object.DomainObject.as_dict(self)
# Set 'license' in _dict to cater for old clients.
# Todo: Remove from Version 2?
_dict['license'] = self.license.title if self.license else _dict.get('license_id', '')
_dict['isopen'] = self.isopen()
tags = [tag.name for tag in self.get_tags()]
tags.sort() # so it is determinable
_dict['tags'] = tags
groups = [getattr(group, ref_group_by) for group in self.get_groups()]
groups.sort()
_dict['groups'] = groups
_dict['extras'] = dict([(key, value) for key, value in self.extras.items()])
_dict['ratings_average'] = self.get_average_rating()
_dict['ratings_count'] = len(self.ratings)
_dict['resources'] = [res.as_dict(core_columns_only=False) \
for res in self.resources]
site_url = config.get('ckan.site_url', None)
if site_url:
_dict['ckan_url'] = '%s/dataset/%s' % (site_url, self.name)
_dict['relationships'] = [rel.as_dict(self, ref_package_by=ref_package_by) for rel in self.get_relationships()]
_dict['metadata_modified'] = self.metadata_modified.isoformat() \
if self.metadata_modified else None
_dict['metadata_created'] = self.metadata_created.isoformat() \
if self.metadata_created else None
_dict['notes_rendered'] = ckan.misc.MarkdownFormat().to_html(self.notes)
#tracking
import ckan.model as model
tracking = model.TrackingSummary.get_for_package(self.id)
_dict['tracking_summary'] = tracking
return _dict
def add_relationship(self, type_, related_package, comment=u''):
'''Creates a new relationship between this package and a
related_package. It leaves the caller to commit the change.
Raises KeyError if the type_ is invalid.
'''
import package_relationship
if type_ in package_relationship.PackageRelationship.get_forward_types():
subject = self
object_ = related_package
elif type_ in package_relationship.PackageRelationship.get_reverse_types():
type_ = package_relationship.PackageRelationship.reverse_to_forward_type(type_)
assert type_
subject = related_package
object_ = self
else:
raise KeyError, 'Package relationship type: %r' % type_
rels = self.get_relationships(with_package=related_package,
type=type_, active=False, direction="forward")
if rels:
rel = rels[0]
if comment:
rel.comment=comment
if rel.state == core.State.DELETED:
rel.undelete()
else:
rel = package_relationship.PackageRelationship(
subject=subject,
object=object_,
type=type_,
comment=comment)
meta.Session.add(rel)
return rel
def get_relationships(self, with_package=None, type=None, active=True,
direction='both'):
'''Returns relationships this package has.
Keeps stored type/ordering (not from pov of self).'''
assert direction in ('both', 'forward', 'reverse')
if with_package:
assert isinstance(with_package, Package)
from package_relationship import PackageRelationship
forward_filters = [PackageRelationship.subject==self]
reverse_filters = [PackageRelationship.object==self]
if with_package:
forward_filters.append(PackageRelationship.object==with_package)
reverse_filters.append(PackageRelationship.subject==with_package)
if active:
forward_filters.append(PackageRelationship.state==core.State.ACTIVE)
reverse_filters.append(PackageRelationship.state==core.State.ACTIVE)
if type:
forward_filters.append(PackageRelationship.type==type)
reverse_type = PackageRelationship.reverse_type(type)
reverse_filters.append(PackageRelationship.type==reverse_type)
q = meta.Session.query(PackageRelationship)
if direction == 'both':
q = q.filter(or_(
and_(*forward_filters),
and_(*reverse_filters),
))
elif direction == 'forward':
q = q.filter(and_(*forward_filters))
elif direction == 'reverse':
q = q.filter(and_(*reverse_filters))
return q.all()
def get_relationships_with(self, other_package, type=None, active=True):
return self.get_relationships(with_package=other_package,
type=type,
active=active)
def get_relationships_printable(self):
'''Returns a list of tuples describing related packages, including
non-direct relationships (such as siblings).
@return: e.g. [(annakarenina, u"is a parent"), ...]
'''
from package_relationship import PackageRelationship
rel_list = []
for rel in self.get_relationships():
if rel.subject == self:
type_printable = PackageRelationship.make_type_printable(rel.type)
rel_list.append((rel.object, type_printable, rel.comment))
else:
type_printable = PackageRelationship.make_type_printable(\
PackageRelationship.forward_to_reverse_type(
rel.type)
)
rel_list.append((rel.subject, type_printable, rel.comment))
# sibling types
# e.g. 'gary' is a child of 'mum', looking for 'bert' is a child of 'mum'
# i.e. for each 'child_of' type relationship ...
for rel_as_subject in self.get_relationships(direction='forward'):
if rel_as_subject.state != core.State.ACTIVE:
continue
# ... parent is the object
parent_pkg = rel_as_subject.object
# Now look for the parent's other relationships as object ...
for parent_rel_as_object in parent_pkg.get_relationships(direction='reverse'):
if parent_rel_as_object.state != core.State.ACTIVE:
continue
# and check children
child_pkg = parent_rel_as_object.subject
if (child_pkg != self and
parent_rel_as_object.type == rel_as_subject.type and
child_pkg.state == core.State.ACTIVE):
type_printable = PackageRelationship.inferred_types_printable['sibling']
rel_list.append((child_pkg, type_printable, None))
return sorted(list(set(rel_list)))
#
## Licenses are currently integrated into the domain model here.
@classmethod
def get_license_register(cls):
if not hasattr(cls, '_license_register'):
cls._license_register = _license.LicenseRegister()
return cls._license_register
@classmethod
def get_license_options(cls):
register = cls.get_license_register()
return [(l.title, l.id) for l in register.values()]
def get_license(self):
if self.license_id:
try:
license = self.get_license_register()[self.license_id]
except KeyError:
license = None
else:
license = None
return license
def set_license(self, license):
if type(license) == _license.License:
self.license_id = license.id
elif type(license) == dict:
self.license_id = license['id']
else:
msg = "Value not a license object or entity: %s" % repr(license)
raise Exception, msg
license = property(get_license, set_license)
@property
def all_related_revisions(self):
'''Returns chronological list of all object revisions related to
this package. Includes PackageRevisions, PackageTagRevisions,
PackageExtraRevisions and ResourceRevisions.
@return List of tuples (revision, [list of object revisions of this
revision])
Ordered by most recent first.
'''
from tag import PackageTag
from resource import ResourceGroup, Resource
from package_extra import PackageExtra
results = {} # revision:[PackageRevision1, PackageTagRevision1, etc.]
for pkg_rev in self.all_revisions:
if not results.has_key(pkg_rev.revision):
results[pkg_rev.revision] = []
results[pkg_rev.revision].append(pkg_rev)
for class_ in [ResourceGroup, Resource, PackageExtra, PackageTag]:
rev_class = class_.__revision_class__
if class_ == Resource:
q = meta.Session.query(rev_class).join('continuity',
'resource_group')
obj_revisions = q.filter(ResourceGroup.package_id == self.id).all()
else:
obj_revisions = meta.Session.query(rev_class).filter_by(package_id=self.id).all()
for obj_rev in obj_revisions:
if not results.has_key(obj_rev.revision):
results[obj_rev.revision] = []
results[obj_rev.revision].append(obj_rev)
result_list = results.items()
ourcmp = lambda rev_tuple1, rev_tuple2: \
cmp(rev_tuple2[0].timestamp, rev_tuple1[0].timestamp)
return sorted(result_list, cmp=ourcmp)
@property
def latest_related_revision(self):
'''Returns the latest revision for the package and its related
objects.'''
return self.all_related_revisions[0][0]
def diff(self, to_revision=None, from_revision=None):
'''Overrides the diff in vdm, so that related obj revisions are
diffed as well as PackageRevisions'''
from tag import PackageTag
from resource import ResourceGroup, Resource
from package_extra import PackageExtra
results = {} # field_name:diffs
results.update(super(Package, self).diff(to_revision, from_revision))
# Iterate over PackageTag, PackageExtra, Resources etc.
for obj_class in [ResourceGroup, Resource, PackageExtra, PackageTag]:
obj_rev_class = obj_class.__revision_class__
# Query for object revisions related to this package
if obj_class == Resource:
obj_rev_query = meta.Session.query(obj_rev_class).\
join('continuity', 'resource_group').\
join('revision').\
filter(ResourceGroup.package_id == self.id).\
order_by(core.Revision.timestamp.desc())
else:
obj_rev_query = meta.Session.query(obj_rev_class).\
filter_by(package_id=self.id).\
join('revision').\
order_by(core.Revision.timestamp.desc())
# Columns to include in the diff
cols_to_diff = obj_class.revisioned_fields()
cols_to_diff.remove('id')
if obj_class is Resource:
cols_to_diff.remove('resource_group_id')
else:
cols_to_diff.remove('package_id')
# Particular object types are better known by an invariant field
if obj_class is PackageTag:
cols_to_diff.remove('tag_id')
elif obj_class is PackageExtra:
cols_to_diff.remove('key')
# Iterate over each object ID
# e.g. for PackageTag, iterate over Tag objects
related_obj_ids = set([related_obj.id for related_obj in obj_rev_query.all()])
for related_obj_id in related_obj_ids:
q = obj_rev_query.filter(obj_rev_class.id==related_obj_id)
to_obj_rev, from_obj_rev = super(Package, self).\
get_obj_revisions_to_diff(
q, to_revision, from_revision)
for col in cols_to_diff:
values = [getattr(obj_rev, col) if obj_rev else '' for obj_rev in (from_obj_rev, to_obj_rev)]
value_diff = self._differ(*values)
if value_diff:
if obj_class.__name__ == 'PackageTag':
display_id = to_obj_rev.tag.name
elif obj_class.__name__ == 'PackageExtra':
display_id = to_obj_rev.key
else:
display_id = related_obj_id[:4]
key = '%s-%s-%s' % (obj_class.__name__, display_id, col)
results[key] = value_diff
return results
@property
def metadata_modified(self):
"""
Return most recent timestamp for revisions related to this package.
NB Excludes changes to the package's groups
"""
from ckan import model
where = [model.package_table.c.id == self.id]
where_clauses = [
and_(model.package_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.package_extra_table.c.package_id == model.package_table.c.id,
model.package_extra_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.package_relationship_table.c.subject_package_id == model.package_table.c.id,
model.package_relationship_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.package_relationship_table.c.object_package_id == model.package_table.c.id,
model.package_relationship_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.resource_group_table.c.package_id == model.package_table.c.id,
model.resource_group_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.resource_group_table.c.package_id == model.package_table.c.id,
model.resource_table.c.resource_group_id == model.resource_group_table.c.id,
model.resource_table.c.revision_id == model.revision_table.c.id, *where),
and_(model.package_tag_table.c.package_id == model.package_table.c.id,
model.package_tag_table.c.revision_id == model.revision_table.c.id, *where)
]
query = union(*[select([model.revision_table.c.timestamp], x) for x in where_clauses]
).order_by('timestamp DESC').limit(1)
# Use current connection because we might be in a 'before_commit' of
# a SessionExtension - only by using the current connection can we get
# at the newly created revision etc. objects.
conn = model.Session.connection()
result = conn.execute(query).fetchone()
if result:
result_datetime = _types.iso_date_to_datetime_for_sqlite(result[0])
timestamp_without_usecs = result_datetime.utctimetuple()
usecs = float(result_datetime.microsecond) / 1e6
# use timegm instead of mktime, because we don't want it localised
timestamp_float = timegm(timestamp_without_usecs) + usecs
return datetime.datetime.utcfromtimestamp(timestamp_float)
@property
def is_private(self):
"""
A package is private if belongs to any private groups
"""
return bool(self.get_groups(capacity='private'))
def is_in_group(self, group):
return group in self.get_groups()
def get_groups(self, group_type=None, capacity=None):
import ckan.model as model
# Gets [ (group, capacity,) ...]
groups = model.Session.query(model.Group,model.Member.capacity).\
join(model.Member, model.Member.group_id == model.Group.id and \
model.Member.table_name == 'package' ).\
join(model.Package, model.Package.id == model.Member.table_id).\
filter(model.Member.state == 'active').\
filter(model.Member.table_id == self.id).all()
caps = [g[1] for g in groups]
groups = [g[0] for g in groups ]
if group_type:
groups = [g for g in groups if g.type == group_type]
if capacity:
groupcaps = zip( groups,caps )
groups = [g[0] for g in groupcaps if g[1] == capacity]
return groups
@property
def metadata_created(self):
import ckan.model as model
q = meta.Session.query(model.PackageRevision.revision_timestamp)\
.filter(model.PackageRevision.id == self.id)\
.order_by(model.PackageRevision.revision_timestamp.asc())
ts = q.first()
if ts:
return ts[0]
@staticmethod
def get_fields(core_only=False, fields_to_ignore=None):
'''Returns a list of the properties of a package.
@param core_only - limit it to fields actually in the package table and
not those on related objects, such as tags & extras.
@param fields_to_ignore - a list of names of fields to not return if
present.
'''
# ['id', 'name', 'title', 'version', 'url', 'author', 'author_email', 'maintainer', 'maintainer_email', 'notes', 'license_id', 'state']
fields = Package.revisioned_fields()
if not core_only:
fields += ['resources', 'tags', 'groups', 'extras', 'relationships']
if fields_to_ignore:
for field in fields_to_ignore:
fields.remove(field)
return fields
def activity_stream_item(self, activity_type, revision, user_id):
import ckan.model
import ckan.logic
assert activity_type in ("new", "changed"), (
str(activity_type))
# Handle 'deleted' objects.
# When the user marks a package as deleted this comes through here as
# a 'changed' package activity. We detect this and change it to a
# 'deleted' activity.
if activity_type == 'changed' and self.state == u'deleted':
if meta.Session.query(activity.Activity).filter_by(
object_id=self.id, activity_type='deleted').all():
# A 'deleted' activity for this object has already been emitted
# FIXME: What if the object was deleted and then activated
# again?
return None
else:
# Emit a 'deleted' activity for this object.
activity_type = 'deleted'
try:
d = {'package': ckan.lib.dictization.table_dictize(self,
context={'model': ckan.model})}
return activity.Activity(user_id, self.id, revision.id,
"%s package" % activity_type, d)
except ckan.logic.NotFound:
# This happens if this package is being purged and therefore has no
# current revision.
# TODO: Purge all related activity stream items when a model object
# is purged.
return None
def activity_stream_detail(self, activity_id, activity_type):
import ckan.model
# Handle 'deleted' objects.
# When the user marks a package as deleted this comes through here as
# a 'changed' package activity. We detect this and change it to a
# 'deleted' activity.
if activity_type == 'changed' and self.state == u'deleted':
activity_type = 'deleted'
package_dict = ckan.lib.dictization.table_dictize(self,
context={'model':ckan.model})
return activity.ActivityDetail(activity_id, self.id, u"Package", activity_type,
{'package': package_dict })
# import here to prevent circular import
import tag
meta.mapper(Package, package_table, properties={
# delete-orphan on cascade does NOT work!
# Why? Answer: because of way SQLAlchemy/our code works there are points
# where PackageTag object is created *and* flushed but does not yet have
# the package_id set (this cause us other problems ...). Some time later a
# second commit happens in which the package_id is correctly set.
# However after first commit PackageTag does not have Package and
# delete-orphan kicks in to remove it!
'package_tags':orm.relation(tag.PackageTag, backref='package',
cascade='all, delete', #, delete-orphan',
),
},
order_by=package_table.c.name,
extension=[vdm.sqlalchemy.Revisioner(package_revision_table),
extension.PluginMapperExtension(),
],
)
vdm.sqlalchemy.modify_base_object_mapper(Package, core.Revision, core.State)
PackageRevision = vdm.sqlalchemy.create_object_version(meta.mapper, Package,
package_revision_table)
def related_packages(self):
return [self.continuity]
PackageRevision.related_packages = related_packages
vdm.sqlalchemy.modify_base_object_mapper(tag.PackageTag, core.Revision, core.State)
PackageTagRevision = vdm.sqlalchemy.create_object_version(meta.mapper, tag.PackageTag,
tag.package_tag_revision_table)
PackageTagRevision.related_packages = lambda self: [self.continuity.package]