com.github.jjYBdx4IL.utils.parser.nagios.Parser Maven / Gradle / Ivy
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/*
* Copyright © 2014 jjYBdx4IL (https://github.com/jjYBdx4IL)
*
* 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 com.github.jjYBdx4IL.utils.parser.nagios;
import com.github.jjYBdx4IL.utils.time.TimeUtils;
import org.apache.commons.io.IOUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
// CHECKSTYLE:OFF
/**
* Nagios status cgi parser.
*
*
* Parses output from
* http://you.nagios.host.com/nagios3/cgi-bin/status.cgi?host=all&style=detail.
*
*
* @author Github jjYBdx4IL Projects
*/
public class Parser {
private static final int MIN_COLS = 7;
private static final String HOST = "Host";
private static final String SERVICE = "Service";
private static final String STATUS = "Status";
private static final String LAST_CHECK = "Last Check";
private static final String DURATION = "Duration";
private static final String ATTEMPT = "Attempt";
private static final String STATUS_INFORMATION = "Status Information";
private static final String SPACE = " ";
private static final String ACK_SELECTOR = "td[class$=ACK]";
private static final String DOWNTIME_SELECTOR =
"img[alt^=This service is currently in a period of scheduled downtime]";
private static final Pattern ATTEMPTS_PATTERN = Pattern.compile("(\\d+)/(\\d+)");
private final SimpleDateFormat lastCheckParser = new SimpleDateFormat("MM-dd-yyyy HH:mm:ss");
private String html;
public Parser() {
lastCheckParser.setTimeZone(TimeZone.getTimeZone("UTC"));
}
// CHECKSTYLE IGNORE .* FOR NEXT 1 LINE
public List parse(String statusCgiHtml) throws ParseException {
html = statusCgiHtml;
return parse();
}
// CHECKSTYLE IGNORE .* FOR NEXT 1 LINE
@SuppressWarnings("deprecation")
public List parse(URL statusCgiUrl) throws IOException, ParseException {
URLConnection conn = statusCgiUrl.openConnection();
conn.setConnectTimeout(15000);
conn.setReadTimeout(15000);
html = IOUtils.toString(conn.getInputStream());
return parse();
}
// CHECKSTYLE IGNORE .* FOR NEXT 1 LINE
public List parse() throws ParseException {
Document doc = Jsoup.parse(html);
// logger.info(doc.toString());
// CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
Map colMap = new HashMap<>(10);
Integer i = 0;
for (Element e : doc.select("html body table th.status")) {
String colName = e.html();
if (colName.indexOf(SPACE) > -1) {
colName = colName.substring(0, colName.indexOf(SPACE));
}
colMap.put(colName, i);
i++;
}
// CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
List res = new ArrayList<>(10);
String defaultHost = null;
for (Element tr : doc.select("html > body > table > tbody > tr")) {
// for(Element p : e.parents()) {
// logger.debug(p.tagName());
// }
// logger.debug("row: " + tr);
Elements tds = tr.select(":root > td");
if (tds.size() < MIN_COLS) {
continue;
}
// logger.info("found td's: " + tds);
String htmlBuf;
final String host;
final String service;
final Status status;
final Date lastCheck;
final long durationMillis;
final Matcher attemptMatcher;
final int attempt;
final int maxAttempts;
final String statusInfo;
final boolean ack;
final boolean downtime;
htmlBuf = tds.get(colMap.get(HOST)).text();
if (htmlBuf.isEmpty()) {
if (defaultHost == null) {
throw new ParseException("check status without host value");
}
host = defaultHost;
} else {
host = htmlBuf;
}
service = tds.get(colMap.get(SERVICE)).text();
if (service.isEmpty()) {
throw new ParseException("failed to parse service field (empty)");
}
htmlBuf = tds.get(colMap.get(STATUS)).html();
if (htmlBuf.indexOf(SPACE) > -1) {
htmlBuf = htmlBuf.substring(0, htmlBuf.indexOf(SPACE));
}
try {
status = Status.byString(htmlBuf);
} catch (InvalidStatusException ex) {
throw new ParseException(String.format("failed to parse status field: '%s'", htmlBuf), ex);
}
htmlBuf = tds.get(colMap.get(LAST_CHECK)).html();
if (htmlBuf.equals("N/A")) {
lastCheck = null;
} else {
try {
lastCheck = lastCheckParser.parse(htmlBuf);
} catch (java.text.ParseException ex) {
throw new ParseException(String.format("failed to parse last-check field: '%s'", htmlBuf), ex);
}
}
durationMillis = TimeUtils.durationToMillis(tds.get(colMap.get(DURATION)).html());
htmlBuf = tds.get(colMap.get(ATTEMPT)).html();
attemptMatcher = ATTEMPTS_PATTERN.matcher(htmlBuf);
if (!attemptMatcher.find()) {
throw new ParseException(String.format("failed to parse attempt field: '%s'", htmlBuf));
}
try {
attempt = Integer.parseInt(attemptMatcher.group(1));
maxAttempts = Integer.parseInt(attemptMatcher.group(2));
} catch (NumberFormatException ex) {
throw new ParseException(String.format("failed to parse attempt field: '%s'", htmlBuf), ex);
}
statusInfo = tds.get(colMap.get(STATUS_INFORMATION)).text();
ack = !tds.get(colMap.get(SERVICE)).select(ACK_SELECTOR).isEmpty();
downtime = !tds.get(colMap.get(SERVICE)).select(DOWNTIME_SELECTOR).isEmpty();
CheckStatus checkStatus = new CheckStatus(host, service, status, lastCheck, durationMillis, attempt,
maxAttempts, statusInfo, ack, downtime);
res.add(checkStatus);
defaultHost = checkStatus.getHost();
}
return res;
}
}