class __impl:
def __init__(self):
persistent = False
force_clean = False
# couchdb cannot handle capital letters, apparently
datastore_name = bootstrap.sys_name.lower() + "_directory"
if 'directory' in CFG:
directory_cfg = CFG['directory']
if 'persistent' in directory_cfg:
persistent = directory_cfg['persistent']
if 'force_clean' in directory_cfg:
force_clean = directory_cfg['force_clean']
if persistent:
self.datastore = CouchDB_DataStore(datastore_name=datastore_name)
else:
self.datastore = MockDB_DataStore(datastore_name=datastore_name)
if force_clean:
self._delete()
if not self.datastore.datastore_exists(datastore_name):
self._create()
self._init()
def _delete(self):
"""
Method to delete directory. Delete occurs as side effect
of deleting the underlying data store.
TODO: Change this functionality in the future?
"""
log.debug("Deleting data store and Directory")
try:
self.datastore.delete_datastore()
except NotFound:
pass
def _get_dn(self, parent, key):
if parent == '/':
return "/%s" % (key)
else:
return "%s/%s" % (parent,key)
def _init(self):
self._assert_existence("/", "Agents")
self._assert_existence("/", "Config")
self._assert_existence("/", "Containers")
self._assert_existence("/", "ObjectTypes")
self._assert_existence("/", "ResourceTypes")
self._assert_existence("/", "ServiceInterfaces")
self._assert_existence("/", "Services")
def _assert_existence(self, parent, key):
dn = self._get_dn(parent, key)
direntry = self._safe_read(dn)
if not direntry:
direntry = IonObject("DirEntry", parent=parent, key=key, attributes={})
# TODO: This may fail because of concurrent create
self.datastore.create(direntry, dn)
def _safe_read(self, oid):
try:
res = self.datastore.read(oid)
return res
except NotFound:
return None
def _create(self):
"""
Method which will create the underlying data store and
persist an empty Directory object.
"""
log.debug("Creating data store and Directory")
self.datastore.create_datastore()
# Persist empty Directory object under known name
self.dir_name = bootstrap.sys_name
directory_obj = IonObject('Directory', name=self.dir_name)
dir_id,rev = self.datastore.create(directory_obj, 'DIR')
# Persist ROOT Directory object
root_obj = IonObject('DirEntry', parent='/', key="ROOT", attributes=dict(sys_name=bootstrap.sys_name))
root_id,rev = self.datastore.create(root_obj, self._get_dn(root_obj.parent, root_obj.key))
def register(self, parent, key, **kwargs):
"""
Add/replace an entry to directory below a parent node.
Note: Does not merge the attribute values of the entry if existing
"""
assert parent and key, "Malformed Directory register"
dn = self._get_dn(parent, key)
log.debug("Directory.add(%s): %s" % (dn, kwargs))
entry_old = None
direntry = self._safe_read(dn)
if direntry:
entry_old = direntry.attributes
direntry.attributes = kwargs
# TODO: This may fail because of concurrent update
self.datastore.update(direntry)
else:
direntry = IonObject("DirEntry", parent=parent, key=key, attributes=kwargs)
# TODO: This may fail because of concurrent create
self.datastore.create(direntry, dn)
return entry_old
def lookup(self, qualified_key='/'):
"""
Read entry residing in directory at parent node level.
"""
log.debug("Reading content at path %s" % qualified_key)
direntry = self._safe_read(qualified_key)
return direntry.attributes if direntry else None
def unregister(self, parent, key):
"""
Remove entry residing in directory at parent node level.
"""
dn = self._get_dn(parent, key)
log.debug("Removing content at path %s" % dn)
entry_old = None
direntry = self._safe_read(dn)
if direntry:
entry_old = direntry.attributes
self.datastore.delete(direntry)
return entry_old
def find_entries(self, qname='/'):
if not str(qname).startswith('/'):
raise BadRequest("Illegal directory node: qname=%s" % qname)
delist = self.datastore.find_dir_entries(qname)
return delist
class ResourceRegistryService(BaseResourceRegistryService):
"""
Service that manages the definition of types of resources and all cross-cutting concerns of all system resources.
The resource registry uses the underlying push and pull ops of the datastore to fetch, retrieve and create
resource objects.
"""
def on_init(self):
resource_registry_name = sys_name + "_resources"
resource_registry_name = resource_registry_name.lower()
persistent = False
force_clean = False
if 'resource_registry' in self.CFG:
resource_registry_cfg = self.CFG['resource_registry']
if 'persistent' in resource_registry_cfg:
if resource_registry_cfg['persistent'] == True:
persistent = True
if 'force_clean' in resource_registry_cfg:
if resource_registry_cfg['force_clean'] == True:
force_clean = True
if persistent:
self.resource_registry = CouchDB_DataStore(datastore_name=resource_registry_name)
else:
self.resource_registry = MockDB_DataStore(datastore_name=resource_registry_name)
if force_clean:
try:
self.resource_registry.delete_datastore(resource_registry_name)
except NotFound:
pass
if not self.resource_registry.datastore_exists(resource_registry_name):
self.resource_registry.create_datastore(resource_registry_name)
# For easier interactive debugging
self.dss = self.resource_registry.server[resource_registry_name] if persistent else None
self.ds = self.resource_registry
def create(self, object={}):
cur_time = get_ion_ts()
object.ts_created = cur_time
object.ts_updated = cur_time
return self.resource_registry.create(object)
def read(self, object_id='', rev_id=''):
return self.resource_registry.read(object_id, rev_id)
def update(self, object={}):
# Do an check whether LCS has been modified
res_obj = self.read(object._id, object._rev)
self.assert_condition(res_obj.lcstate == object.lcstate, "Cannot modify life cycle state in update!")
object.ts_updated = get_ion_ts()
return self.resource_registry.update(object)
def delete(self, object_id=''):
res_obj = self.read(object_id)
if not res_obj:
raise NotFound("Resource %s does not exist" % object_id)
return self.resource_registry.delete(res_obj)
def execute_lifecycle_transition(self, resource_id='', transition_event='', current_lcstate=''):
self.assert_condition(not current_lcstate or current_lcstate in LCS, "Unknown life-cycle state %s" % current_lcstate)
res_obj = self.read(resource_id)
if current_lcstate and res_obj.lcstate != current_lcstate:
raise Inconsistent("Resource id=%s lcstate is %s, expected was %s" % (
resource_id, res_obj.lcstate, current_lcstate))
restype = type(res_obj).__name__
restype_workflow = lcs_workflows.get(restype, None)
if not restype_workflow:
restype_workflow = lcs_workflows['Resource']
new_state = restype_workflow.get_successor(res_obj.lcstate, transition_event)
if not new_state:
raise Inconsistent("Resource id=%s, type=%s, lcstate=%s has no transition for event %s" % (
resource_id, restype, res_obj.lcstate, transition_event))
res_obj.lcstate = new_state
res_obj.ts_updated = get_ion_ts()
updres = self.resource_registry.update(res_obj)
return new_state
def create_association(self, subject=None, predicate=None, object=None, assoc_type=None):
return self.resource_registry.create_association(subject, predicate, object, assoc_type)
def delete_association(self, association=''):
return self.resource_registry.delete_association(association)
def find(self, **kwargs):
raise NotImplementedError("Do not use find. Use a specific find operation instead.")
def find_objects(self, subject="", predicate="", object_type="", id_only=False):
return self.resource_registry.find_objects(subject, predicate, object_type, id_only=id_only)
def find_subjects(self, subject_type="", predicate="", object="", id_only=False):
return self.resource_registry.find_subjects(subject_type, predicate, object, id_only=id_only)
def find_associations(self, subject="", predicate="", object="", id_only=False):
return self.resource_registry.find_associations(subject, predicate, object, id_only=id_only)
def get_association(self, subject="", predicate="", object=""):
assoc = self.resource_registry.find_associations(subject, predicate, object, id_only=True)
if not assoc:
raise NotFound("Association for subject/predicate/object %s/%s/%s not found" % (str(subject),str(predicate),str(object)))
elif len(assoc) > 1:
raise Inconsistent("Duplicate associations found for subject/predicate/object %s/%s/%s" % (str(subject),str(predicate),str(object)))
return assoc[0]
def find_resources(self, restype="", lcstate="", name="", id_only=False):
return self.resource_registry.find_resources(restype, lcstate, name, id_only=id_only)
