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+# Copyright 2011 Canonical Ltd.
+#
+# This file is part of u1db.
+#
+# u1db is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# u1db is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with u1db. If not, see <http://www.gnu.org/licenses/>.
+
+"""State for servers exposing a set of U1DB databases."""
+import os
+import errno
+
+class ServerState(object):
+ """Passed to a Request when it is instantiated.
+
+ This is used to track server-side state, such as working-directory, open
+ databases, etc.
+ """
+
+ def __init__(self):
+ self._workingdir = None
+
+ def set_workingdir(self, path):
+ self._workingdir = path
+
+ def _relpath(self, relpath):
+ # Note: We don't want to allow absolute paths here, because we
+ # don't want to expose the filesystem. We should also check that
+ # relpath doesn't have '..' in it, etc.
+ return self._workingdir + '/' + relpath
+
+ def open_database(self, path):
+ """Open a database at the given location."""
+ from u1db.backends import sqlite_backend
+ full_path = self._relpath(path)
+ return sqlite_backend.SQLiteDatabase.open_database(full_path,
+ create=False)
+
+ def check_database(self, path):
+ """Check if the database at the given location exists.
+
+ Simply returns if it does or raises DatabaseDoesNotExist.
+ """
+ db = self.open_database(path)
+ db.close()
+
+ def ensure_database(self, path):
+ """Ensure database at the given location."""
+ from u1db.backends import sqlite_backend
+ full_path = self._relpath(path)
+ db = sqlite_backend.SQLiteDatabase.open_database(full_path,
+ create=True)
+ return db, db._replica_uid
+
+ def delete_database(self, path):
+ """Delete database at the given location."""
+ from u1db.backends import sqlite_backend
+ full_path = self._relpath(path)
+ sqlite_backend.SQLiteDatabase.delete_database(full_path)