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authordrebs <drebs@leap.se>2012-12-10 11:00:10 -0200
committerdrebs <drebs@leap.se>2012-12-10 11:00:10 -0200
commitded8b721def13751fe0b27e50ab1a3cb999fb292 (patch)
tree14f47d36aff68e657f52d6fc148e8637bc2efc5e /backends/objectstore.py
parent275ccbcdfaf7b1bdca606b1d75f5cc55a3abc2ff (diff)
Refactor to add ObjectStore class.
Diffstat (limited to 'backends/objectstore.py')
-rw-r--r--backends/objectstore.py153
1 files changed, 153 insertions, 0 deletions
diff --git a/backends/objectstore.py b/backends/objectstore.py
new file mode 100644
index 00000000..e36df72d
--- /dev/null
+++ b/backends/objectstore.py
@@ -0,0 +1,153 @@
+from u1db.backends import CommonBackend
+
+
+class ObjectStore(CommonBackend):
+
+ def __init__(self):
+ self._sync_log = SyncLog()
+ self._transaction_log = TransactionLog()
+
+ #-------------------------------------------------------------------------
+ # implemented methods from Database
+ #-------------------------------------------------------------------------
+
+ def set_document_factory(self, factory):
+ self._factory = factory
+
+ def set_document_size_limit(self, limit):
+ raise NotImplementedError(self.set_document_size_limit)
+
+ def whats_changed(self, old_generation=0):
+ self._get_u1db_data()
+ return self._transaction_log.whats_changed(old_generation)
+
+ def get_doc(self, doc_id, include_deleted=False):
+ doc = self._get_doc(doc_id, check_for_conflicts=True)
+ if doc is None:
+ return None
+ if doc.is_tombstone() and not include_deleted:
+ return None
+ return doc
+
+ def delete_doc(self, doc):
+ old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
+ if old_doc is None:
+ raise errors.DocumentDoesNotExist
+ if old_doc.rev != doc.rev:
+ raise errors.RevisionConflict()
+ if old_doc.is_tombstone():
+ raise errors.DocumentAlreadyDeleted
+ if old_doc.has_conflicts:
+ raise errors.ConflictedDoc()
+ new_rev = self._allocate_doc_rev(doc.rev)
+ doc.rev = new_rev
+ doc.make_tombstone()
+ self._put_doc(olddoc)
+ return new_rev
+
+ # start of index-related methods: these are not supported by this backend.
+
+ def create_index(self, index_name, *index_expressions):
+ return False
+
+ def delete_index(self, index_name):
+ return False
+
+ def list_indexes(self):
+ return []
+
+ def get_from_index(self, index_name, *key_values):
+ return []
+
+ def get_range_from_index(self, index_name, start_value=None,
+ end_value=None):
+ return []
+
+ def get_index_keys(self, index_name):
+ return []
+
+ # end of index-related methods: these are not supported by this backend.
+
+ def get_doc_conflicts(self, doc_id):
+ return []
+
+ def resolve_doc(self, doc, conflicted_doc_revs):
+ raise NotImplementedError(self.resolve_doc)
+
+ def _get_replica_gen_and_trans_id(self, other_replica_uid):
+ self._get_u1db_data()
+ return self._sync_log.get_replica_gen_and_trans_id(other_replica_uid)
+
+ def _set_replica_gen_and_trans_id(self, other_replica_uid,
+ other_generation, other_transaction_id):
+ self._get_u1db_data()
+ self._sync_log.set_replica_gen_and_trans_id(other_replica_uid,
+ other_generation,
+ other_transaction_id)
+ self._set_u1db_data()
+
+ #-------------------------------------------------------------------------
+ # implemented methods from CommonBackend
+ #-------------------------------------------------------------------------
+
+ def _get_generation(self):
+ self._get_u1db_data()
+ return self._transaction_log.get_generation()
+
+ def _get_generation_info(self):
+ self._get_u1db_data()
+ return self._transaction_log.get_generation_info()
+
+ def _has_conflicts(self, doc_id):
+ # Documents never have conflicts on server.
+ return False
+
+ def _put_and_update_indexes(self, doc_id, old_doc, new_rev, content):
+ raise NotImplementedError(self._put_and_update_indexes)
+
+
+ def _get_trans_id_for_gen(self, generation):
+ self._get_u1db_data()
+ trans_id = self._transaction_log.get_trans_id_for_gen(generation)
+ if trans_id is None:
+ raise errors.InvalidGeneration
+ return trans_id
+
+ def _ensure_u1db_data(self):
+ """
+ Guarantee that u1db data exists in store.
+ """
+ if not self._is_initialized():
+ self._initialize()
+ u1db_data = self._get_doc('u1db_data')
+ self._sync_log.log = u1db_data.content['sync_log']
+ self._transaction_log.log = u1db_data.content['transaction_log']
+
+ def _is_initialized(self):
+ """
+ Verify if u1db data exists in store.
+ """
+ if not self._get_doc('u1db_data'):
+ return False
+ return True
+
+ def _initialize(self):
+ """
+ Create u1db data object in store.
+ """
+ content = { 'transaction_log' : [],
+ 'sync_log' : [] }
+ doc = self.create_doc('u1db_data', content)
+
+ def _get_u1db_data(self):
+ data = self.get_doc('u1db_data').content
+ self._transaction_log = data['transaction_log']
+ self._sync_log = data['sync_log']
+
+ def _set_u1db_data(self):
+ doc = self._factory('u1db_data')
+ doc.content = { 'transaction_log' : self._transaction_log,
+ 'sync_log' : self._sync_log }
+ self.put_doc(doc)
+
+