| /* |
| * Copyright 2014-2015 Open Networking Laboratory |
| * |
| * 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.net; |
| |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.regex.Pattern; |
| |
| import org.apache.karaf.shell.commands.Argument; |
| import org.apache.karaf.shell.commands.Command; |
| import org.apache.karaf.shell.commands.Option; |
| import org.onlab.util.Tools; |
| import org.onosproject.cli.AbstractShellCommand; |
| import org.onosproject.cluster.Leadership; |
| import org.onosproject.cluster.LeadershipService; |
| import org.onosproject.cluster.NodeId; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| |
| /** |
| * Prints the leader for every topic. |
| */ |
| @Command(scope = "onos", name = "leaders", |
| description = "Finds the leader for particular topic.") |
| public class LeaderCommand extends AbstractShellCommand { |
| |
| private static final String FMT = "%-30s | %-15s | %-6s | %-10s |"; |
| private static final String FMT_C = "%-30s | %-15s | %-19s |"; |
| private boolean allTopics; |
| private Pattern pattern; |
| |
| @Argument(index = 0, name = "topic", description = "A leadership topic. Can be a regex", |
| required = false, multiValued = false) |
| String topicPattern = null; |
| |
| @Option(name = "-c", aliases = "--candidates", |
| description = "List candidate Nodes for each topic's leadership race", |
| required = false, multiValued = false) |
| private boolean showCandidates = false; |
| |
| /** |
| * Compares leaders, sorting by toString() output. |
| */ |
| private Comparator<Leadership> leadershipComparator = |
| (e1, e2) -> { |
| if (e1.leader() == null && e2.leader() == null) { |
| return 0; |
| } |
| if (e1.leader() == null) { |
| return 1; |
| } |
| if (e2.leader() == null) { |
| return -1; |
| } |
| return e1.leader().toString().compareTo(e2.leader().toString()); |
| }; |
| |
| /** |
| * Displays text representing the leaders. |
| * |
| * @param leaderBoard map of leaders |
| */ |
| private void displayLeaders(Map<String, Leadership> leaderBoard) { |
| print("------------------------------------------------------------------------"); |
| print(FMT, "Topic", "Leader", "Epoch", "Elected"); |
| print("------------------------------------------------------------------------"); |
| |
| leaderBoard.values() |
| .stream() |
| .filter(l -> allTopics || pattern.matcher(l.topic()).matches()) |
| .sorted(leadershipComparator) |
| .forEach(l -> print(FMT, |
| l.topic(), |
| l.leader(), |
| l.epoch(), |
| Tools.timeAgo(l.electedTime()))); |
| print("------------------------------------------------------------------------"); |
| } |
| |
| private void displayCandidates(Map<String, Leadership> leaderBoard, |
| Map<String, List<NodeId>> candidates) { |
| print("------------------------------------------------------------------------"); |
| print(FMT_C, "Topic", "Leader", "Candidates"); |
| print("------------------------------------------------------------------------"); |
| candidates |
| .entrySet() |
| .stream() |
| .filter(es -> allTopics || pattern.matcher(es.getKey()).matches()) |
| .forEach(es -> { |
| List<NodeId> list = es.getValue(); |
| if (list == null || list.isEmpty()) { |
| return; |
| } |
| Leadership l = leaderBoard.get(es.getKey()); |
| print(FMT_C, |
| es.getKey(), |
| l == null ? "null" : l.leader(), |
| // formatting hacks to get it into a table |
| list.get(0).toString()); |
| list.subList(1, list.size()).forEach(n -> print(FMT_C, " ", " ", n)); |
| print(FMT_C, " ", " ", " "); |
| }); |
| print("------------------------------------------------------------------------"); |
| } |
| |
| /** |
| * Returns JSON node representing the leaders. |
| * |
| * @param leaderBoard map of leaders |
| */ |
| private JsonNode json(Map<String, Leadership> leaderBoard) { |
| ObjectMapper mapper = new ObjectMapper(); |
| ArrayNode result = mapper.createArrayNode(); |
| leaderBoard.values() |
| .stream() |
| .sorted(leadershipComparator) |
| .forEach(l -> |
| result.add( |
| mapper.createObjectNode() |
| .put("topic", l.topic()) |
| .put("leader", l.leader().toString()) |
| .put("candidates", l.candidates().toString()) |
| .put("epoch", l.epoch()) |
| .put("electedTime", Tools.timeAgo(l.electedTime())))); |
| |
| return result; |
| } |
| |
| /** |
| * Returns JSON node representing the leaders. |
| * |
| * @param leaderBoard map of leaders |
| */ |
| private JsonNode json(Map<String, Leadership> leaderBoard, |
| Map<String, List<NodeId>> candidateBoard) { |
| ObjectMapper mapper = new ObjectMapper(); |
| ArrayNode result = mapper.createArrayNode(); |
| candidateBoard.entrySet() |
| .stream() |
| .forEach(es -> { |
| Leadership l = leaderBoard.get(es.getKey()); |
| result.add( |
| mapper.createObjectNode() |
| .put("topic", es.getKey()) |
| .put("leader", l == null ? "none" : l.leader().toString()) |
| .put("candidates", es.getValue().toString())); |
| }); |
| return result; |
| } |
| |
| @Override |
| protected void execute() { |
| LeadershipService leaderService = get(LeadershipService.class); |
| Map<String, Leadership> leaderBoard = leaderService.getLeaderBoard(); |
| if (topicPattern == null) { |
| allTopics = true; |
| } else { |
| allTopics = false; |
| pattern = Pattern.compile(topicPattern); |
| } |
| |
| if (showCandidates) { |
| Map<String, List<NodeId>> candidates = leaderService |
| .getCandidates(); |
| if (outputJson()) { |
| print("%s", json(leaderBoard, candidates)); |
| } else { |
| displayCandidates(leaderBoard, candidates); |
| } |
| } else { |
| if (outputJson()) { |
| print("%s", json(leaderBoard)); |
| } else { |
| displayLeaders(leaderBoard); |
| } |
| } |
| } |
| } |