[modules/docker] Add basic docker list module

bumblebee/modules/docker_ps.py

@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*-
+
+"""Displays the number of docker containers running
+
+Requires the following python packages:
+    * docker
+
+"""
+
+try:
+    import docker
+except ImportError:
+    pass
+
+from requests.exceptions import ConnectionError
+
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        widget = bumblebee.output.Widget(full_text=self.status)
+        super(Module, self).__init__(engine, config, widget)
+        self._status = self.status
+
+    def update(self, widgets):
+        self._status = self.status
+
+    def status(self, _):
+        cli = docker.DockerClient(base_url='unix://var/run/docker.sock')
+        try:
+            cli.ping()
+        except ConnectionError:
+            return "Daemon off"
+        return "OK - {}".format(len(cli.containers.list(filters={'status': "running"})))