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/*
* Copyright 2016 Huawei Technologies Co., Ltd.
*
* 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 org.onap.vfc.nfvo.multivimproxy.common.util.restclient;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.GZIPInputStream;
import org.apache.commons.lang.StringUtils;
import org.eclipse.jetty.client.ContentExchange;
import org.eclipse.jetty.client.HttpDestination;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.HttpHeaders;
import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.util.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ContentExchange implementation classe to provide access to response.
* <br/>
* <p>
* </p>
*
* @author
* @version 28-May-2016
*/
public class RestHttpContentExchange extends ContentExchange {
private static final Logger LOGGER = LoggerFactory.getLogger(RestHttpContentExchange.class);
private boolean gzip = false;
private RestfulAsyncCallback callback = null;
/**
* Constructor<br/>
* <p>
* </p>
*
* @since
* @param cacheFields whether to cache response header.
* @param asyncCallback callback method.
*/
RestHttpContentExchange(final boolean cacheFields, final RestfulAsyncCallback asyncCallback) {
super(cacheFields);
this.callback = asyncCallback;
}
/**
* Extract message.
* <br/>
*
* @param data GZipped data.
* @return Uncompressed data.
* @throws IOException
* @since
*/
public String decompressGzipToStr(final byte[] data) throws IOException {
if(data == null) {
return "";
}
final StringBuilder out = new StringBuilder();
try (
ByteArrayInputStream input = new ByteArrayInputStream(data);
GZIPInputStream gzis = new GZIPInputStream(input);
InputStreamReader reader = new InputStreamReader(gzis, Charset.forName(RestfulClientConst.ENCODING))){
final char[] buff = new char[1024];
for(int n; (n = reader.read(buff)) != -1;) {
out.append(new String(buff, 0, n));
}
}
return out.toString();
}
/**
* View response headers Content-Encoding values if you need to extract data.<br/>
*
* @param name buffer
* @param value value
* @throws IOException
* @since
*/
@Override
protected synchronized void onResponseHeader(final Buffer name, final Buffer value) throws IOException {
super.onResponseHeader(name, value);
final int header = HttpHeaders.CACHE.getOrdinal(name);
if(header == HttpHeaders.CONTENT_ENCODING_ORDINAL) {
final String encoding = StringUtil.asciiToLowerCase(value.toString());
gzip = encoding != null && StringUtils.contains(encoding, "gzip");
}
}
@Override
protected void onResponseComplete() throws IOException {
if(LOGGER.isInfoEnabled()) {
LOGGER.info("Response has Complete:" + "path:" + this.getRequestURI().replace("\n", "0x0A"));
}
super.onResponseComplete();
if(callback != null) {
final RestfulResponse rsp = getResponse();
callback.callback(rsp);
}
}
@Override
protected void onRequestCommitted() throws IOException {
if(LOGGER.isInfoEnabled()) {
LOGGER.info("Request Header has been send:" + "path:" + this.getRequestURI().replace("\n", "0x0A"));
}
super.onRequestCommitted();
}
@Override
protected void onRequestComplete() throws IOException {
if(LOGGER.isInfoEnabled()) {
LOGGER.info("Request has bend send complete:" + "path:" + this.getRequestURI().replace("\n", "0x0A"));
}
super.onRequestComplete();
}
@Override
protected void onException(final Throwable x) {
LOGGER.warn("onException:", x);
super.onException(x);
if(callback != null) {
callback.handleExcepion(x);
}
}
@Override
protected void onConnectionFailed(final Throwable x) {
LOGGER.warn("onConnectionFailed:", x);
super.onConnectionFailed(x);
if(callback != null) {
callback.handleExcepion(x);
}
}
@Override
protected void expire(final HttpDestination destination) {
super.expire(destination);
if(callback != null) {
callback.handleExcepion(new ServiceException("request is expired, status:" + toState(getStatus())));
}
}
public boolean isGzip() {
return gzip;
}
/**
* Get the response as RestfulResponse.
* <br/>
*
* @return response object.
* @throws IOException
* @since
*/
public RestfulResponse getResponse() throws IOException {
final RestfulResponse rsp = new RestfulResponse();
rsp.setStatus(this.getResponseStatus());
if(isGzip()) {
final String responseString = decompressGzipToStr(getResponseContentBytes());
rsp.setResponseJson(responseString);
} else {
rsp.setResponseJson(this.getResponseContent());
}
final HttpFields field = this.getResponseFields();
if(field != null) {
final Map<String, String> header = new HashMap<>();
final Enumeration<String> names = field.getFieldNames();
for(final Enumeration<String> e = names; e.hasMoreElements();) {
final String fieldName = e.nextElement();
final String fieldValue = field.getStringField(fieldName);
header.put(fieldName, fieldValue);
}
rsp.setRespHeaderMap(header);
}
return rsp;
}
}
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