Add km module kafka

tests/kafkatest/services/trogdor/task_spec.py

@@ -0,0 +1,54 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+
+
+class TaskSpec(object):
+    """
+    The base class for a task specification.
+
+    MAX_DURATION_MS         The longest duration we should use for a task specification.
+    """
+
+    MAX_DURATION_MS=10000000
+
+    def __init__(self, start_ms, duration_ms):
+        """
+        Create a new task specification.
+
+        :param start_ms:        The target start time in milliseconds since the epoch.
+        :param duration_ms:     The duration in milliseconds.
+        """
+        self.message = {
+            'startMs': start_ms,
+            'durationMs': duration_ms
+        }
+
+    @staticmethod
+    def to_node_names(nodes):
+        """
+        Convert an array of nodes or node names to an array of node names.
+        """
+        node_names = []
+        for obj in nodes:
+            if isinstance(obj, basestring):
+                node_names.append(obj)
+            else:
+                node_names.append(obj.name)
+        return node_names
+
+    def __str__(self):
+        return json.dumps(self.message)