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JMole Zabbix protocol
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package net.welen.jmole.protocols.zabbix;

/*
 * #%L
 * JMole, https://bitbucket.org/awelen/jmole
 * %%
 * Copyright (C) 2015 - 2020 Anders Welén, [email protected]
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.ObjectName;
import javax.management.ReflectionException;

import net.welen.jmole.Configuration;
import net.welen.jmole.JMole;
import net.welen.jmole.threshold.Threshold;
import net.welen.jmole.threshold.ThresholdValues;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.quigley.zabbixj.metrics.MetricsException;
import com.quigley.zabbixj.metrics.MetricsKey;
import com.quigley.zabbixj.metrics.MetricsProvider;

public class JMoleMetricsProvider implements MetricsProvider {

	private final static Logger LOG = Logger.getLogger(JMoleMetricsProvider.class.getName());
	
	private JMole jmole = null;

	public JMoleMetricsProvider(JMole jmole) {
		this.jmole = jmole;
	}

	public Object getValue(MetricsKey metricKey) throws MetricsException {
		String key = metricKey.getKey();
		LOG.log(Level.FINE, "Key: " + key);

		// Zabbix Discovery?
		if (key.equals("discovery")) {
			try {
				return getZabbixDiscovery();
			} catch (Throwable t) {
				LOG.log(Level.SEVERE, "Couldn't get Zabbix discovery", t);
				throw new MetricsException(t);
			}
		}

		// Zabbix ping
		if (key.equals("ping")) {
			return 1;
		}

		// Zabbix fetching values?
		if (key.equals("fetch")) {
			try {
				return getZabbixFetch(metricKey);
			} catch (Exception e) {
				throw new MetricsException(e);
			}
		}

		LOG.log(Level.WARNING, "Unknown key: " + key);
		throw new MetricsException("Unknown key: " + key);
	}

	private String getZabbixFetch(MetricsKey metricKey) throws InstanceNotFoundException, AttributeNotFoundException, ReflectionException, MBeanException, UnsupportedEncodingException {
		String path = metricKey.getParameters()[0];
		String paths[] = path.split("/");
		if (paths.length != 3) {
			LOG.log(Level.SEVERE, "Incorrect path: " + path);
			throw new MetricsException("Incorrect path: " + path);
		}
		Object answer = jmole.collectMeasurement(URLDecoder.decode(paths[0], "UTF-8"),
												URLDecoder.decode(paths[1], "UTF-8"),
												URLDecoder.decode(paths[2], "UTF-8"));

		LOG.log(Level.FINE, "Returning \"" + answer.toString() + "\" for: " + metricKey.getKey());		
		return answer.toString();
	}

	private String getZabbixDiscovery() throws JSONException, InstanceNotFoundException, ReflectionException, AttributeNotFoundException, MBeanException, UnsupportedEncodingException {
		JSONObject jsonObject = new JSONObject();
		JSONArray jsonArray = new JSONArray();

		// Get all measurements
		for (Configuration configuration : jmole.getConfiguration()) {
			String category = configuration.getPresentationInformation().getCategory();
			for (ObjectName objectName : configuration.getMBeanFinder().getMatchingObjectNames()) {
				String name = configuration.getMBeanCollector().getConstructedName(objectName);					
				for (String attribute : configuration.getMBeanCollector().getAttributes()) {	

					JSONObject tmpObject = new JSONObject();
					tmpObject.put("{#JMOLEPATH}",
											URLEncoder.encode(category, "UTF-8") + "/" +
											URLEncoder.encode(name, "UTF-8") + "/" +
											URLEncoder.encode(attribute, "UTF-8"));
					tmpObject.put("{#JMOLECATEGORY}", category);
					tmpObject.put("{#JMOLENAME}", name);
					tmpObject.put("{#JMOLEATTRIBUTE}", attribute);
					
					// Unit is not used until Zabbix can pick it up in the template
					tmpObject.put("{#JMOLEUNIT}", configuration.getPresentationInformation().getUnit());
					tmpObject.put("{#JMOLETITLE}", configuration.getMBeanCollector().getConstructedName(objectName));
					tmpObject.put("{#JMOLEATTRIBUTEDESCRIPTION}", configuration.getPresentationInformation().translateAttributeLabel(attribute));

					Threshold threshold = configuration.getThresholds().get(attribute);					
					if (threshold != null) {

						ThresholdValues individualValues = threshold.getIndividualThresholds().get(configuration.getMBeanCollector().getConstructedName(objectName));
						String low;
						String high;
						
						// Warnings
						if (individualValues == null) {
							low = threshold.getWarningLowThreshold();	
							high = threshold.getWarningHighThreshold();
						} else {
							low = individualValues.getWarningLowThreshold();
							high = individualValues.getWarningHighThreshold();
						}
						low = Threshold.calculateThreshold(low, configuration.getMBeanCollector(), objectName, attribute);
						if (low.length() > 0) {							
							tmpObject.put("{#JMOLEWARNLOW}", low);
						}
						high = Threshold.calculateThreshold(high, configuration.getMBeanCollector(), objectName, attribute);
						if (high.length() > 0) {							
							tmpObject.put("{#JMOLEWARNHIGH}", high);
						}

						// Critical
						if (individualValues == null) {
							low = threshold.getCriticalLowThreshold();	
							high = threshold.getCriticalHighThreshold();
						} else {
							low = individualValues.getCriticalLowThreshold();
							high = individualValues.getCriticalHighThreshold();
						}
						low = Threshold.calculateThreshold(low, configuration.getMBeanCollector(), objectName, attribute);
						if (low.length() > 0) {							
							tmpObject.put("{#JMOLECRITICALLOW}", low);
						}
						high = Threshold.calculateThreshold(high, configuration.getMBeanCollector(), objectName, attribute);
						if (high.length() > 0) {							
							tmpObject.put("{#JMOLECRITICALHIGH}", high);
						}

					}
					jsonArray.put(tmpObject);
				}
			}
		}

		jsonObject.put("data", jsonArray);

		String answer = jsonObject.toString();

		LOG.log(Level.FINE, "Returning Zabbix discovery: " + answer);
		return answer;
	}

}