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package org.onap.sdc.dcae.controller.proxy;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.proxy.ProxyServlet;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.util.StringUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.concurrent.TimeUnit;
public class DcaeProxy extends ProxyServlet {
private static Logger log = LoggerFactory.getLogger(DcaeProxy.class);
private static Cache<String, MdcData> mdcDataCache = CacheBuilder.newBuilder().expireAfterWrite(10, TimeUnit.SECONDS).build();
//TODO proper configuration class
private static String beHostUrl;
public DcaeProxy(String beHostUrl){
this.beHostUrl = beHostUrl;
}
@Override
protected HttpClient newHttpClient() {
SslContextFactory factory = new SslContextFactory(true);
return new HttpClient(factory);
}
@Override
protected HttpClient createHttpClient() throws ServletException {
HttpClient client = super.createHttpClient();
client.setIdleTimeout(180000);
client.setConnectTimeout(180000);
return client;
}
@Override
protected String rewriteTarget(HttpServletRequest request) {
try{
logRequest(request);
}catch (Exception e){
log.error("Unexpected FE request logging error :", e);
}
String uri = request.getRequestURI();
uri = uri.replaceFirst("/dcaed", "/dcae"); // replacing the new FE context (/dcaed) with BE context (/dcae)
uri = uri.replace("/dcaeProxy", ""); // removing the proxy from the request
String query = request.getQueryString();
StringBuilder url = new StringBuilder();
url.append(beHostUrl).append(uri);
if(null != query){
url.append("?").append(query); // restoring all query params if tsuch exists
}
String urlString = url.toString();
log.info("New FE Proxy outgoing request={}", urlString);
return urlString;
}
@Override
protected void onProxyResponseSuccess(HttpServletRequest clientRequest, HttpServletResponse proxyResponse, Response serverResponse) {
try{
logResponse(clientRequest, serverResponse);
}catch (Exception e){
log.error("Unexpected FE response logging error :", e);
}
super.onProxyResponseSuccess(clientRequest, proxyResponse, serverResponse);
}
private void logRequest(HttpServletRequest httpRequest) {
MDC.clear();
Long transactionStartTime = System.currentTimeMillis();
String requestId = httpRequest.getHeader("X-ECOMP-RequestID");
String serviceInstanceID = httpRequest.getHeader("X-ECOMP-ServiceID");
if (!StringUtils.isEmpty(requestId)) {
String userId = httpRequest.getHeader("USER_ID");
String remoteAddr = httpRequest.getRemoteAddr();
String localAddr = httpRequest.getLocalAddr();
mdcDataCache.put(requestId, new MdcData(serviceInstanceID, userId, remoteAddr, localAddr, transactionStartTime));
updateMdc(requestId, serviceInstanceID, userId, remoteAddr, localAddr, null);
}
inHttpRequest(httpRequest);
}
private void logResponse(HttpServletRequest request, Response proxyResponse) {
String requestId = request.getHeader("X-ECOMP-RequestID");
if (requestId != null) {
MdcData mdcData = mdcDataCache.getIfPresent(requestId);
if (mdcData != null) {
Long transactionStartTime = mdcData.getTransactionStartTime();
String transactionRoundTime = Long.toString(System.currentTimeMillis() - transactionStartTime);
updateMdc(requestId, mdcData.getServiceInstanceID(), mdcData.getUserId(), mdcData.getRemoteAddr(), mdcData.getLocalAddr(), transactionRoundTime);
}
}
outHttpResponse(proxyResponse);
MDC.clear();
}
private class MdcData {
private String serviceInstanceID;
private String userId;
private String remoteAddr;
private String localAddr;
private Long transactionStartTime;
MdcData(String serviceInstanceID, String userId, String remoteAddr, String localAddr, Long transactionStartTime) {
this.serviceInstanceID = serviceInstanceID;
this.userId = userId;
this.remoteAddr = remoteAddr;
this.localAddr = localAddr;
this.transactionStartTime = transactionStartTime;
}
Long getTransactionStartTime() {
return transactionStartTime;
}
public String getUserId() {
return userId;
}
String getRemoteAddr() {
return remoteAddr;
}
String getLocalAddr() {
return localAddr;
}
String getServiceInstanceID() {
return serviceInstanceID;
}
}
private void updateMdc(String uuid, String serviceInstanceID, String userId, String remoteAddr, String localAddr, String transactionStartTime) {
MDC.put("uuid", uuid);
MDC.put("serviceInstanceID", serviceInstanceID);
MDC.put("userId", userId);
MDC.put("remoteAddr", remoteAddr);
MDC.put("localAddr", localAddr);
MDC.put("timer", transactionStartTime);
}
// Extracted for purpose of clear method name, for logback %M parameter
private void inHttpRequest(HttpServletRequest httpRequest) {
log.info("{} {} {}", httpRequest.getMethod(), httpRequest.getRequestURI(), httpRequest.getProtocol());
}
// Extracted for purpose of clear method name, for logback %M parameter
private void outHttpResponse(Response proxyResponse) {
log.info("SC=\"{}\"", proxyResponse.getStatus());
}
}
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