--- /dev/null
+#
+#
+
+# Copyright (C) 2010 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+
+"""Module for a simple query language"""
+
+from ganeti import errors
+
+
+OP_OR = "|"
+OP_EQUAL = "="
+
+
+def ReadSimpleFilter(namefield, filter_):
+ """Function extracting wanted names from restricted filter.
+
+ This should only be used until proper filtering is implemented. The filter
+ must either be empty or of the format C{["|", ["=", field, "name1"], ["=",
+ field, "name2"], ...]}.
+
+ """
+ if filter_ is None:
+ return []
+
+ if not isinstance(filter_, list):
+ raise errors.ParameterError("Filter should be list")
+
+ if not filter_ or filter_[0] != OP_OR:
+ raise errors.ParameterError("Filter should start with OR operator")
+
+ if len(filter_) < 2:
+ raise errors.ParameterError("Invalid filter, OR operator should have"
+ " operands")
+
+ result = []
+
+ for idx, item in enumerate(filter_[1:]):
+ if not isinstance(item, list):
+ raise errors.ParameterError("Invalid OR operator, operand %s not a"
+ " list" % idx)
+
+ if len(item) != 3 or item[0] != OP_EQUAL:
+ raise errors.ParameterError("Invalid OR operator, operand %s is not an"
+ " equality filter" % idx)
+
+ (_, name, value) = item
+
+ if not isinstance(value, basestring):
+ raise errors.ParameterError("Operand %s for OR should compare against a"
+ " string" % idx)
+
+ if name != namefield:
+ raise errors.ParameterError("Operand %s for OR should filter field '%s',"
+ " not '%s'" % (idx, namefield, name))
+
+ result.append(value)
+
+ return result
--- /dev/null
+#!/usr/bin/python
+#
+
+# Copyright (C) 2010 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+
+"""Script for testing ganeti.qlang"""
+
+import unittest
+
+from ganeti import utils
+from ganeti import errors
+from ganeti import qlang
+
+import testutils
+
+
+class TestReadSimpleFilter(unittest.TestCase):
+ def _Test(self, filter_, expected):
+ self.assertEqual(qlang.ReadSimpleFilter("name", filter_), expected)
+
+ def test(self):
+ self._Test(None, [])
+ self._Test(["|", ["=", "name", "xyz"]], ["xyz"])
+
+ for i in [1, 3, 10, 25, 140]:
+ self._Test(["|"] + [["=", "name", "node%s" % j] for j in range(i)],
+ ["node%s" % j for j in range(i)])
+
+ def testErrors(self):
+ for i in [123, True, False, "", "Hello World", "a==b",
+ [], ["x"], ["x", "y", "z"], ["|"],
+ ["|", ["="]], ["|", "x"], ["|", 123],
+ ["|", ["=", "otherfield", "xyz"]],
+ ["|", ["=", "name", "xyz"], "abc"],
+ ["|", ["=", "name", "xyz", "too", "long"]],
+ ["|", ["=", "name", []]],
+ ["|", ["=", "name", 999]],
+ ["|", ["=", "name", "abc"], ["=", "otherfield", "xyz"]]]:
+ self.assertRaises(errors.ParameterError, qlang.ReadSimpleFilter,
+ "name", i)
+
+
+if __name__ == "__main__":
+ testutils.GanetiTestProgram()