[ONOS-7144] Membership CLI Command

Change-Id: I7f36e288f3ff2ebb5a1df74123a8e1adb22cb769
diff --git a/cli/src/main/java/org/onosproject/cli/MembershipsListCommand.java b/cli/src/main/java/org/onosproject/cli/MembershipsListCommand.java
new file mode 100644
index 0000000..f1a5c42
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/MembershipsListCommand.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+package org.onosproject.cli;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cluster.ClusterAdminService;
+import org.onosproject.cluster.ControllerNode;
+import org.onosproject.cluster.Member;
+import org.onosproject.cluster.MembershipService;
+
+import java.util.List;
+import java.util.Optional;
+
+import static com.google.common.collect.Lists.newArrayList;
+import static org.onosproject.utils.Comparators.MEMBERSHIP_COMPARATOR;
+
+/**
+ * Command to list the memberships in the system.
+ */
+@Command(scope = "onos", name = "memberships",
+        description = "Lists information about memberships in the system")
+public class MembershipsListCommand extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        MembershipService service = get(MembershipService.class);
+        ClusterAdminService clusterService = get(ClusterAdminService.class);
+
+        if (outputJson()) {
+            print("%s", json(service));
+        } else {
+            service.getGroups().forEach(group -> {
+                List<Member> members = newArrayList(group.members());
+                print("-------------------------------------------------------------------");
+                print("Version: %s, Members: %d", group.version(), members.size());
+                members.sort(MEMBERSHIP_COMPARATOR);
+                members.forEach(
+                        member -> {
+                            Optional<ControllerNode> controllerNode =
+                                    Optional.ofNullable(clusterService.getNode(member.nodeId()));
+
+                            if (!controllerNode.isPresent()) {
+                                print(" id=%s, version=%s, self=%s",
+                                        member.nodeId(),
+                                        member.version(),
+                                        member.equals(service.getLocalMember()) ? "*" : "");
+                            } else {
+                                ControllerNode node = controllerNode.get();
+                                print(" id=%s, ip=%s, tcpPort=%s, state=%s, self=%s",
+                                        member.nodeId(),
+                                        node.ip(),
+                                        node.tcpPort(),
+                                        clusterService.getState(node.id()),
+                                        member.equals(service.getLocalMember()) ? "*" : "");
+                            }
+                        }
+                );
+                print("-------------------------------------------------------------------");
+            });
+        }
+    }
+
+    /**
+     * Produces JSON structure.
+     *
+     * @param service membership service
+     * @return json structure
+     */
+    private JsonNode json(MembershipService service) {
+        ObjectMapper mapper = new ObjectMapper();
+        ArrayNode result = mapper.createArrayNode();
+
+        service.getGroups().forEach(group -> {
+            ObjectNode groupNode = mapper.createObjectNode();
+
+            ArrayNode membersNode = mapper.createArrayNode();
+            groupNode.put("version", group.version().toString());
+            groupNode.put("members", membersNode);
+
+            group.members().forEach(member -> membersNode.add(member.nodeId().toString()));
+
+            result.add(groupNode);
+        });
+
+        return result;
+    }
+}
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index a401a1f..82470e5 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -919,6 +919,10 @@
             </optional-completers>
         </command>
 
+        <command>
+            <action class="org.onosproject.cli.MembershipsListCommand"/>
+        </command>
+
         <!--Domain command-->
         <command>
             <action class="org.onosproject.cli.net.GetDomainsCommand"/>
diff --git a/core/common/src/main/java/org/onosproject/utils/Comparators.java b/core/common/src/main/java/org/onosproject/utils/Comparators.java
index c03c99b..b509012 100644
--- a/core/common/src/main/java/org/onosproject/utils/Comparators.java
+++ b/core/common/src/main/java/org/onosproject/utils/Comparators.java
@@ -16,6 +16,7 @@
 package org.onosproject.utils;
 
 import org.onosproject.cluster.ControllerNode;
+import org.onosproject.cluster.Member;
 import org.onosproject.core.Application;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.net.intf.Interface;
@@ -93,6 +94,9 @@
     public static final Comparator<ControllerNode> NODE_COMPARATOR =
             (ci1, ci2) -> ci1.id().toString().compareTo(ci2.id().toString());
 
+    public static final Comparator<Member> MEMBERSHIP_COMPARATOR =
+            (ci1, ci2) -> ci1.nodeId().toString().compareTo(ci2.nodeId().toString());
+
     public static final Comparator<ConnectPoint> CONNECT_POINT_COMPARATOR =
             (o1, o2) -> {
                 int compareId = ELEMENT_ID_COMPARATOR.compare(o1.elementId(), o2.elementId());