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/*
* 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);
}
}
}
}
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