Add km module kafka

tests/kafkatest/services/kafka/config.py

@@ -0,0 +1,48 @@
+# 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 config_property
+
+
+class KafkaConfig(dict):
+    """A dictionary-like container class which allows for definition of overridable default values,
+    which is also capable of "rendering" itself as a useable server.properties file.
+    """
+
+    DEFAULTS = {
+        config_property.PORT: 9092,
+        config_property.SOCKET_RECEIVE_BUFFER_BYTES: 65536,
+        config_property.LOG_DIRS: "/mnt/kafka/kafka-data-logs-1,/mnt/kafka/kafka-data-logs-2",
+        config_property.ZOOKEEPER_CONNECTION_TIMEOUT_MS: 2000
+    }
+
+    def __init__(self, **kwargs):
+        super(KafkaConfig, self).__init__(**kwargs)
+
+        # Set defaults
+        for key, val in self.DEFAULTS.items():
+            if not self.has_key(key):
+                self[key] = val
+
+    def render(self):
+        """Render self as a series of lines key=val\n, and do so in a consistent order. """
+        keys = [k for k in self.keys()]
+        keys.sort()
+
+        s = ""
+        for k in keys:
+            s += "%s=%s\n" % (k, str(self[k]))
+        return s
+