RemoveAliasAction.java

package org.epics.archiverappliance.mgmt.bpl;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.HashMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.epics.archiverappliance.common.BPLAction;
import org.epics.archiverappliance.config.ApplianceInfo;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.config.PVTypeInfo;
import org.epics.archiverappliance.utils.ui.GetUrlContent;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

/**
 *
 * @epics.BPLAction - Remove an alias for the specified PV. This is only supported for PVs who have completed their archive PV workflow.
 * @epics.BPLActionParam pv - The real name of the pv.
 * @epics.BPLActionParam aliasname - The alias name of the pv. 
 * @epics.BPLActionEnd
 * @author mshankar
 *
 */
public class RemoveAliasAction implements BPLAction {
	private static Logger logger = Logger.getLogger(RemoveAliasAction.class.getName());

	@Override
	public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService) throws IOException {
		String pvName = req.getParameter("pv");
		if(pvName == null || pvName.equals("")) {
			resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
			return;
		}

		String aliasName = req.getParameter("aliasname");
		if(aliasName == null || aliasName.equals("")) {
			resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
			return;
		}
		
		logger.info("Removing alias " + aliasName + " for pv " + pvName);
		
		PVTypeInfo typeInfo = configService.getTypeInfoForPV(pvName);
		if(typeInfo == null) {
			logger.error("We do not yet support removing aliases for PVs which have not completed their workflow " + pvName);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
			return;
		}
		
		ApplianceInfo infoForPV = configService.getApplianceForPV(pvName);
		if(infoForPV.equals(configService.getMyApplianceInfo())) {
			configService.removeAlias(aliasName, pvName);
			HashMap<String, Object> infoValues = new HashMap<String, Object>();
			infoValues.put("status", "ok");
			infoValues.put("desc", "Removed an alias " + aliasName + " for PV " + pvName);
			try(PrintWriter out = resp.getWriter()) {
				out.println(JSONValue.toJSONString(infoValues));
			}
			return;
		} else { 
			// Route to the appliance that hosts the PVTypeInfo
			String redirectURL = infoForPV.getMgmtURL()
					+ "/removeAlias?pv=" 
					+ URLEncoder.encode(pvName, "UTF-8") 
					+ "&aliasname=" 
					+ URLEncoder.encode(aliasName, "UTF-8"); 

			logger.info("Redirecting removeAlias request for PV to " + infoForPV.getIdentity() + " using URL " + redirectURL);
			JSONObject status = GetUrlContent.getURLContentAsJSONObject(redirectURL);
			try(PrintWriter out = resp.getWriter()) {
				out.println(JSONValue.toJSONString(status));
			}
			return;
		}		
	}
}