Fixed service restart in MapR plugin

MapR plugin made attempts to restart node
processes which are not present in cluster.

Closes-Bug: #1496513
Change-Id: Ib8279c2034ccf73a03456e577d59d625211d388d

sahara/plugins/mapr/base/base_cluster_context.py

@@ -16,35 +16,24 @@
 import collections
 
 from oslo_config import cfg
-import six
 
 import sahara.exceptions as e
 from sahara.i18n import _
 import sahara.plugins.mapr.abstract.cluster_context as cc
 import sahara.plugins.mapr.domain.distro as distro
-import sahara.plugins.mapr.domain.node_process as np
 import sahara.plugins.mapr.services.management.management as mng
 import sahara.plugins.mapr.services.maprfs.maprfs as mfs
 import sahara.plugins.mapr.services.oozie.oozie as oozie
 from sahara.plugins.mapr.services.swift import swift
 import sahara.plugins.mapr.services.yarn.yarn as yarn
 import sahara.plugins.mapr.util.general as g
+import sahara.plugins.mapr.util.service_utils as su
 import sahara.plugins.utils as u
 
-
 CONF = cfg.CONF
 CONF.import_opt("enable_data_locality", "sahara.topology.topology_helper")
 
 
-def _get_node_process_name(node_process):
-    name = None
-    if isinstance(node_process, np.NodeProcess):
-        name = node_process.ui_name
-    elif isinstance(node_process, six.string_types):
-        name = node_process
-    return name
-
-
 class BaseClusterContext(cc.AbstractClusterContext):
     ubuntu_base = 'http://package.mapr.com/releases/v%s/ubuntu/ mapr optional'
     centos_base = 'http://package.mapr.com/releases/v%s/redhat/'
@@ -209,13 +198,14 @@ class BaseClusterContext(cc.AbstractClusterContext):
             return config.default_value
 
     def get_instances(self, node_process=None):
-        name = _get_node_process_name(node_process)
-        return u.get_instances(self.cluster, name)
+        if node_process is not None:
+            node_process = su.get_node_process_name(node_process)
+        return u.get_instances(self.cluster, node_process)
 
     def get_instance(self, node_process):
-        name = _get_node_process_name(node_process)
-        i = u.get_instances(self.cluster, name)
-        return i[0] if i else None
+        node_process_name = su.get_node_process_name(node_process)
+        instances = u.get_instances(self.cluster, node_process_name)
+        return instances[0] if instances else None
 
     def get_instances_ip(self, node_process):
         return [i.internal_ip for i in self.get_instances(node_process)]
@@ -229,9 +219,7 @@ class BaseClusterContext(cc.AbstractClusterContext):
                                for ip in self.get_instances_ip(mng.ZOOKEEPER)])
 
     def check_for_process(self, instance, process):
-        processes = instance.node_group.node_processes
-        name = _get_node_process_name(process)
-        return name in processes
+        return su.has_node_process(instance, process)
 
     def get_services_configs_dict(self, services=None):
         if not services:
@@ -279,19 +267,22 @@ class BaseClusterContext(cc.AbstractClusterContext):
                 return service
 
     def get_service_name_by_node_process(self, node_process):
-        node_process = _get_node_process_name(node_process)
+        node_process_name = su.get_node_process_name(node_process)
         for service in self.all_services:
-            node_processes = [np.ui_name for np in service.node_processes]
-            if node_process in node_processes:
+            service_node_processes = [np.ui_name
+                                      for np in service.node_processes]
+            if node_process_name in service_node_processes:
                 return service.ui_name
 
     def get_instances_count(self, node_process=None):
-        name = _get_node_process_name(node_process)
-        return u.get_instances_count(self.cluster, name)
+        if node_process is not None:
+            node_process = su.get_node_process_name(node_process)
+        return u.get_instances_count(self.cluster, node_process)
 
     def get_node_groups(self, node_process=None):
-        name = _get_node_process_name(node_process)
-        return u.get_node_groups(self.cluster, name)
+        if node_process is not None:
+            node_process = su.get_node_process_name(node_process)
+        return u.get_node_groups(self.cluster, node_process)
 
     def get_cldb_nodes_ip(self, separator=','):
         return separator.join(self.get_instances_ip(mfs.CLDB))
@@ -320,16 +311,9 @@ class BaseClusterContext(cc.AbstractClusterContext):
 
     def filter_instances(self, instances, node_process=None, service=None):
         if node_process:
-            return list(filter(
-                lambda i: self.check_for_process(i, node_process), instances))
+            return su.filter_by_node_process(instances, node_process)
         if service:
-            result = []
-            for instance in instances:
-                for node_process in service.node_processes:
-                    if self.check_for_process(instance, node_process):
-                        result += [instance]
-                        break
-            return result
+            return su.filter_by_service(instances, service)
         return list(instances)
 
     def removed_instances(self, node_process=None, service=None):

sahara/plugins/mapr/domain/service.py

@@ -19,10 +19,10 @@ from sahara import context
 import sahara.exceptions as e
 from sahara.i18n import _
 import sahara.plugins.exceptions as ex
+from sahara.plugins.mapr.util import service_utils as su
 import sahara.plugins.provisioning as p
 from sahara.utils import files as files
 
-
 _INSTALL_PACKAGES_TIMEOUT = 3600
 
 
@@ -197,7 +197,10 @@ class Service(object):
 
     def restart(self, instances):
         for node_process in self.node_processes:
-            node_process.restart(instances)
+            filtered_instances = su.filter_by_node_process(instances,
+                                                           node_process)
+            if filtered_instances:
+                node_process.restart(filtered_instances)
 
     def service_dir(self, cluster_context):
         args = {'mapr_home': cluster_context.mapr_home, 'name': self.name}

sahara/plugins/mapr/services/hue/hue.py

@@ -36,7 +36,6 @@ import sahara.plugins.mapr.util.general as g
 import sahara.plugins.mapr.util.validation_utils as vu
 import sahara.utils.files as files
 
-
 LOG = logging.getLogger(__name__)
 
 HUE = np.NodeProcess(

sahara/plugins/mapr/util/service_utils.py

@@ -0,0 +1,51 @@
+# Copyright (c) 2015, MapR Technologies
+#
+# Licensed 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 six
+
+from sahara.i18n import _
+
+
+def get_node_process_name(node_process):
+    # This import is placed here to avoid circular imports
+    from sahara.plugins.mapr.domain import node_process as np  # noqa
+
+    if isinstance(node_process, np.NodeProcess):
+        return node_process.ui_name
+    if isinstance(node_process, six.string_types):
+        return node_process
+
+    raise TypeError(_("Invalid argument type %s") % type(node_process))
+
+
+def has_node_process(instance, node_process):
+    node_process_name = get_node_process_name(node_process)
+    instance_node_processes = instance.node_group.node_processes
+    return node_process_name in instance_node_processes
+
+
+def has_service(instance, service):
+    return any(has_node_process(instance, node_process)
+               for node_process in service.node_processes)
+
+
+def filter_by_node_process(instances, node_process):
+    return [instance for instance in instances
+            if has_node_process(instance, node_process)]
+
+
+def filter_by_service(instances, service):
+    return [instance for instance in instances
+            if has_service(instance, service)]