LeaderCommand.java
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/*
* Copyright 2014-present 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 | %-5s | %-10s |";
private static final String FMT_C = "%-30s | %-15s | %-5s | %-10s | %-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 = (l1, l2) ->
String.valueOf(l1.leaderNodeId()).compareTo(String.valueOf(l2.leaderNodeId()));
/**
* Displays text representing the leaders.
*
* @param leaderBoard map of leaders
*/
private void displayLeaders(Map<String, Leadership> leaderBoard) {
print("------------------------------------------------------------------------");
print(FMT, "Topic", "Leader", "Term", "Elected");
print("------------------------------------------------------------------------");
leaderBoard.values()
.stream()
.filter(l -> allTopics || pattern.matcher(l.topic()).matches())
.filter(l -> l.leader() != null)
.sorted(leadershipComparator)
.forEach(l -> print(FMT,
l.topic(),
l.leaderNodeId(),
l.leader().term(),
Tools.timeAgo(l.leader().termStartTime())));
print("------------------------------------------------------------------------");
}
private void displayCandidates(Map<String, Leadership> leaderBoard) {
print("--------------------------------------------------------------------------------------------");
print(FMT_C, "Topic", "Leader", "Term", "Elected", "Candidates");
print("--------------------------------------------------------------------------------------------");
leaderBoard.entrySet()
.stream()
.filter(es -> allTopics || pattern.matcher(es.getKey()).matches())
.sorted((a, b) -> leadershipComparator.compare(a.getValue(), b.getValue()))
.forEach(es -> {
Leadership l = es.getValue();
List<NodeId> candidateList = l.candidates();
if (candidateList == null || candidateList.isEmpty()) {
return;
}
print(FMT_C,
es.getKey(),
String.valueOf(l.leaderNodeId()),
l.leader().term(),
Tools.timeAgo(l.leader().termStartTime()),
// formatting hacks to get it into a table
candidateList.get(0).toString());
candidateList.subList(1, candidateList.size())
.forEach(n -> print(FMT_C, " ", " ", " ", " ", n));
print(FMT_C, " ", " ", " ", " ", " ");
});
print("--------------------------------------------------------------------------------------------");
}
/**
* Returns JSON node representing the leaders and candidates.
*
* @param leaderBoard map of leaders
*/
private JsonNode json(Map<String, Leadership> leaderBoard) {
ObjectMapper mapper = new ObjectMapper();
ArrayNode result = mapper.createArrayNode();
leaderBoard.forEach((topic, leadership) -> {
result.add(
mapper.createObjectNode()
.put("topic", topic)
.put("leader", leadership.leaderNodeId() == null ?
"none" : leadership.leaderNodeId().toString())
.put("term", leadership.leader() != null ?
leadership.leader().term() : 0)
.put("termStartTime", leadership.leader() != null ?
leadership.leader().termStartTime() : 0)
.put("candidates", leadership.candidates().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 (outputJson()) {
print("%s", json(leaderBoard));
return;
}
if (showCandidates) {
displayCandidates(leaderBoard);
} else {
displayLeaders(leaderBoard);
}
}
}