[ONOS-7902] Add node handler and a set of CLIs for kubernetes node

Change-Id: Iee4a88e4af437d551a38342de339455387389f61
diff --git a/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/cli/K8sNodeInitCommand.java b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/cli/K8sNodeInitCommand.java
new file mode 100644
index 0000000..a414e15
--- /dev/null
+++ b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/cli/K8sNodeInitCommand.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2019-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.k8snode.cli;
+
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.Option;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.k8snode.api.K8sNode;
+import org.onosproject.k8snode.api.K8sNodeAdminService;
+import org.onosproject.k8snode.api.K8sNodeService;
+
+import static org.onosproject.k8snode.api.K8sNodeState.COMPLETE;
+import static org.onosproject.k8snode.api.K8sNodeState.INIT;
+
+/**
+ * Initializes nodes for node service.
+ */
+@Service
+@Command(scope = "onos", name = "k8s-node-init",
+        description = "Initializes nodes for kubernetes node service")
+public class K8sNodeInitCommand extends AbstractShellCommand {
+
+    @Option(name = "-a", aliases = "--all", description = "Apply this command to all nodes",
+            required = false, multiValued = false)
+    private boolean isAll = false;
+
+    @Option(name = "-i", aliases = "--incomplete",
+            description = "Apply this command to incomplete nodes",
+            required = false, multiValued = false)
+    private boolean isIncomplete = false;
+
+    @Argument(index = 0, name = "hostnames", description = "Hostname(s) to apply this command",
+            required = false, multiValued = true)
+    @Completion(K8sHostnameCompleter.class)
+    private String[] hostnames = null;
+
+    @Override
+    protected void doExecute() {
+        K8sNodeService nodeService = get(K8sNodeService.class);
+        K8sNodeAdminService nodeAdminService = get(K8sNodeAdminService.class);
+
+        if ((!isAll && !isIncomplete && hostnames == null) ||
+                (isAll && isIncomplete) ||
+                (isIncomplete && hostnames != null) ||
+                (hostnames != null && isAll)) {
+            print("Please specify one of hostname, --all, and --incomplete options.");
+            return;
+        }
+
+        if (isAll) {
+            hostnames = nodeService.nodes().stream()
+                    .map(K8sNode::hostname).toArray(String[]::new);
+        } else if (isIncomplete) {
+            hostnames = nodeService.nodes().stream()
+                    .filter(node -> node.state() != COMPLETE)
+                    .map(K8sNode::hostname).toArray(String[]::new);
+        }
+
+        for (String hostname : hostnames) {
+            K8sNode node = nodeService.node(hostname);
+            if (node == null) {
+                print("Unable to find %s", hostname);
+                continue;
+            }
+            print("Initializing %s", hostname);
+            K8sNode updated = node.updateState(INIT);
+            nodeAdminService.updateNode(updated);
+        }
+        print("Done.");
+    }
+}