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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017 Amdocs
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.openecomp.sparky.viewandinspect.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.openecomp.cl.api.Logger;
import org.openecomp.cl.eelf.LoggerFactory;
import org.openecomp.sparky.config.oxm.OxmModelLoader;
import org.openecomp.sparky.dal.rest.OperationResult;
import org.openecomp.sparky.dal.servlet.ResettableStreamHttpServletRequest;
import org.openecomp.sparky.logging.AaiUiMsgs;
import org.openecomp.sparky.util.NodeUtils;
import org.openecomp.sparky.viewandinspect.entity.QueryRequest;
import org.openecomp.sparky.viewandinspect.services.VisualizationService;
import org.openecomp.cl.mdc.MdcContext;
/**
* A dedicated servlet for handling Front-End Visualization Requests and performing feats of magic
* to execute the right model/type/config driven queries to build the D3 visualization output JSON
* back to the FE.
*
* @author DAVEA
*
*/
public class VisualizationServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 4678831934652478571L;
private static final Logger LOG =
LoggerFactory.getInstance().getLogger(VisualizationServlet.class);
private static final String VISUALIZATION_API_ENDPOINT = "prepareVisualization";
private final VisualizationService visualizationService;
/**
* Instantiates a new visualization servlet.
*
* @throws Exception the exception
*/
public VisualizationServlet() throws Exception {
this.visualizationService = new VisualizationService(OxmModelLoader.getInstance());
}
/**
* Inits the.
*
* @param filterConfig the filter config
* @throws ServletException the servlet exception
*/
public void init(FilterConfig filterConfig) throws ServletException {
LOG.debug(AaiUiMsgs.DEBUG_GENERIC, "init()");
}
/**
* Gets the request body.
*
* @param request the request
* @return the request body
*/
private String getRequestBody(HttpServletRequest request) {
ResettableStreamHttpServletRequest requestWrapper =
new ResettableStreamHttpServletRequest(request);
String body = null;
try {
body = IOUtils.toString(requestWrapper.getRequestBody());
} catch (IOException exc) {
LOG.error(AaiUiMsgs.EXCEPTION_CAUGHT, "Trying to get body from request",
exc.getLocalizedMessage());
}
return body;
}
/*
* (non-Javadoc)
*
* @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
* javax.servlet.http.HttpServletResponse)
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/*
* (non-Javadoc)
*
* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
* javax.servlet.http.HttpServletResponse)
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String txnID = request.getHeader("X-TransactionId");
if (txnID == null) {
txnID = NodeUtils.getRandomTxnId();
}
String partnerName = request.getHeader("X-FromAppId");
if (partnerName == null) {
partnerName = "Browser";
}
MdcContext.initialize(txnID, "AAI-UI", "", partnerName, request.getRemoteAddr());
String postRequestBody = getRequestBody(request);
String requestUri = request.getRequestURI();
OperationResult operationResult = null;
/*
* For now we only have a single API call but there could be more in the future
*/
if (requestUri.endsWith(VISUALIZATION_API_ENDPOINT)) {
/*
* Work our magic and determine the best way to interrogate AAI to get the stuff we are
* interested in. Perhaps it should be an edge-tag-query or perhaps it is a straight up
* derived self-link query.
*/
/*
* Map request body to an interpreted API PoJo object
*/
QueryRequest queryRequest = visualizationService.analyzeQueryRequestBody(postRequestBody);
if (queryRequest != null) {
operationResult = visualizationService.buildVisualizationUsingGenericQuery(queryRequest);
} else {
LOG.error(AaiUiMsgs.FAILED_TO_ANALYZE,
String.format("Failed to analyze post request query body = '%s'", postRequestBody));
operationResult = new OperationResult();
operationResult.setResult(500,
String.format("Failed to analyze post request query body = '%s'", postRequestBody));
}
} else {
// unhandled type
LOG.error(AaiUiMsgs.UNKNOWN_SERVER_ERROR, "Unhandled requestUri - " + requestUri);
operationResult = new OperationResult();
operationResult.setResult(500, "Unknown Server Error: Unhandled requestUri = " + requestUri);
}
PrintWriter out = response.getWriter();
response.addHeader("Content-Type", "application/xml");
response.setStatus(operationResult.getResultCode());
if (operationResult.getResultCode() == 200) {
response.setContentLength(operationResult.getResult().length());
out.print(operationResult.getResult());
out.print("\n");
} else {
response.setContentLength(operationResult.getResult().length());
out.print(operationResult.getResult());
out.print("\n");
}
}
@Override
public void destroy() {
super.destroy();
visualizationService.shutdown();
}
}
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