/*
* Copyright (c) 2016 Network New Technologies Inc.
*
* 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.networknt.traceability;
import com.networknt.config.Config;
import com.networknt.handler.MiddlewareHandler;
import com.networknt.utility.Constants;
import com.networknt.utility.ModuleRegistry;
import io.undertow.Handlers;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.HttpString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This is a handler that checks if X-Traceability-Id exists in request header and put it into
* response header if it exists.
*
* The traceability-id is set by the consumer and it will be passed to all services and returned
* to the consumer eventually if there is no error. The SimpleAuditHandler will log it in audit log
* and Client will pass it to the next service.
*
* Dependencies: SimpleAuditHandler/FullAuditHandler, Client
*
* Created by steve on 05/11/16.
*/
public class TraceabilityHandler implements MiddlewareHandler {
static final Logger logger = LoggerFactory.getLogger(TraceabilityHandler.class);
public static final String CONFIG_NAME = "traceability";
public static TraceabilityConfig config = null;
static {
config = (TraceabilityConfig)Config.getInstance().getJsonObjectConfig(CONFIG_NAME, TraceabilityConfig.class);
}
private volatile HttpHandler next;
public TraceabilityHandler() {
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
String tid = exchange.getRequestHeaders().getFirst(Constants.TRACEABILITY_ID);
if(tid != null) {
exchange.getResponseHeaders().put(new HttpString(Constants.TRACEABILITY_ID), tid);
}
next.handleRequest(exchange);
}
@Override
public HttpHandler getNext() {
return next;
}
@Override
public MiddlewareHandler setNext(final HttpHandler next) {
Handlers.handlerNotNull(next);
this.next = next;
return this;
}
@Override
public boolean isEnabled() {
return config.isEnabled();
}
@Override
public void register() {
ModuleRegistry.registerModule(TraceabilityHandler.class.getName(), Config.getInstance().getJsonMapConfigNoCache(CONFIG_NAME), null);
}
}