Adding in cancel for a build that is building.

buildman/manager/buildcanceller.py

@@ -0,0 +1,25 @@
+import logging
+
+from buildman.manager.etcd_canceller import EtcdCanceller
+from buildman.manager.noop_canceller import NoopCanceller
+
+logger = logging.getLogger(__name__)
+
+CANCELLERS = {'ephemeral': EtcdCanceller}
+
+
+class BuildCanceller(object):
+  """ A class to manage cancelling a build """
+
+  def __init__(self, app=None):
+    build_manager_config = app.config.get('BUILD_MANAGER')
+    if app is None or build_manager_config is None:
+      self.handler = NoopCanceller()
+      return
+
+    canceller = CANCELLERS.get(build_manager_config[0], NoopCanceller)
+    self.handler = canceller(build_manager_config[1])
+
+  def try_cancel_build(self, uuid):
+    """ A method to kill a running build """
+    return self.handler.try_cancel_build(uuid)