2 files changed, 60 insertions, 2 deletions
diff --git a/backends/couch.py b/backends/couch.py
index c8dadfa8..56b12574 100644
--- a/backends/couch.py
+++ b/backends/couch.py
@@ -1,10 +1,16 @@
+# general imports
 import uuid
 from base64 import b64encode, b64decode
+import re
+# u1db
 from u1db import errors
 from u1db.sync import LocalSyncTarget
 from u1db.backends.inmemory import InMemoryIndex
+from u1db.remote.server_state import ServerState
+# couchdb
 from couchdb.client import Server, Document as CouchDocument
 from couchdb.http import ResourceNotFound
+# leap
 from leap.soledad.backends.objectstore import ObjectStore
 from leap.soledad.backends.leap_backend import LeapDocument
 
@@ -14,9 +20,29 @@ except ImportError:
     import json  # noqa
 
 
+class InvalidURLError(Exception):
+    pass
+
+
 class CouchDatabase(ObjectStore):
     """A U1DB implementation that uses Couch as its persistence layer."""
 
+    @classmethod
+    def open_database(cls, url, create):
+        # get database from url
+        m = re.match('(.*)/([^/]+)$', url)
+        if not m:
+            raise InvalidURLError
+        url = m.group(1)
+        dbname = m.group(2)
+        server = Server(url=url)
+        try:
+            server[dbname]
+        except ResourceNotFound:
+            if not create:
+                raise
+            return cls(url, dbname)
+
     def __init__(self, url, database, replica_uid=None, full_commit=True,
                  session=None):
         """Create a new Couch data container."""
@@ -215,3 +241,30 @@ class CouchSyncTarget(LocalSyncTarget):
         self._db._set_replica_gen_and_trans_id(
             source_replica_uid, source_replica_generation,
             source_replica_transaction_id)
+
+
+class CouchServerState(ServerState):
+
+    def open_database(self, path):
+        """
+        Open a database at the given location.
+        """
+        return CouchDatabase.open_database(path, create=False)
+
+    def check_database(self, path):
+        """
+        Check if the database at the given location exists.
+        """
+        db = self.open_database(path)
+        db.close()
+
+    def ensure_database(self, path):
+        """Ensure database at the given location."""
+        db = CouchDatabase.open_database(path,
+                                         create=True)
+        return db, db._replica_uid
+
+    def delete_database(self, path):
+        """Delete database at the given location."""
+        db = CouchDatabase.open_database(path)
+        db.delete_database()
diff --git a/backends/objectstore.py b/backends/objectstore.py
index 588fc7a1..199107af 100644
--- a/backends/objectstore.py
+++ b/backends/objectstore.py
@@ -7,8 +7,13 @@ class ObjectStore(InMemoryDatabase):
     A backend for storing u1db data in an object store.
     """
 
-    def __init__(self, replica_uid=None):
-        super(ObjectStore, self).__init__(replica_uid)
+    @classmethod
+    def open_database(cls, url, create, document_factory=None):
+        raise NotImplementedError(cls.open_database)
+
+    def __init__(self, replica_uid=None, document_factory=None):
+        super(ObjectStore, self).__init__(replica_uid,
+                                          document_factory=document_factory)
         # sync data in memory with data in object store
         if not self._get_doc(self.U1DB_DATA_DOC_ID):
             self._init_u1db_data()