lib/zodb: Add support for opening neo:// and zeo:// databases

Done via manual hacky way for now. The clean solution would be to reuse
e.g. repoze.zodbconn[1] or zodburi[2] and teach them to support NEO.

But for now we can't -- those eggs depend on ZODB, and we still use
ZODB3 for maintaining compatibility with both ZODB3.10 and ZODB4.

/cc @jm

[1] https://pypi.python.org/pypi/repoze.zodbconn
[2] https://pypi.python.org/pypi/zodburi

lib/zodb.py

@@ -20,9 +20,33 @@ from ZODB.FileStorage import FileStorage
 from ZODB import DB
 
 
+# open db storage by uri
+def dbstoropen(uri):
+    # TODO better use repoze.zodbconn or zodburi
+    #      ( but they require ZODB, instead of ZODB3, and thus we cannot use
+    #        them together with ZODB 3.10 which we still support )
+    if uri.startswith('neo://'):
+        # XXX hacky, only 1 master supported
+        from neo.client.Storage import Storage
+        name, master = uri[6:].split('@', 1)    # neo://db@master -> db, master
+        stor = Storage(master_nodes=master, name=name)
+
+    elif uri.startswith('zeo://'):
+        # XXX hacky
+        from ZEO.ClientStorage import ClientStorage
+        host, port = uri[6:].split(':',1)       # zeo://host:port -> host, port
+        port = int(port)
+        stor = ClientStorage((host, port))
+
+    else:
+        stor = FileStorage(uri)
+
+    return stor
+
+
 # open stor/db/connection and return root obj
-def dbopen(path):
-    stor = FileStorage(path)
+def dbopen(uri):
+    stor = dbstoropen(uri)
     db   = DB(stor)
     conn = db.open()
     root = conn.root()