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/*-
* ============LICENSE_START=======================================================
* openECOMP : SDN-C
* ================================================================================
* Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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=========================================================
*/
package org.onap.ccsdk.sli.adaptors.messagerouter.consumer.provider.impl;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Base64;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.ConsumerApi;
import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.RequestHandler;
import org.onap.ccsdk.sli.core.utils.common.AcceptIpAddressHostNameVerifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;
import com.google.gson.JsonParseException;
/*
* java.net based client to build message router consumers
*/
public abstract class AbstractBaseConsumer implements ConsumerApi {
private static final Logger LOG = LoggerFactory.getLogger(AbstractBaseConsumer.class);
private static final String REQUEST_METHOD = "GET";
private final String host;
private final Integer connectTimeout;
private final Integer readTimeout;
private final String group;
private final String id;
private final String filter;
private final Integer limit;
private final Integer timeoutQueryParamValue;
private final String authorizationString;
protected RequestHandler requestHandler;
protected URL url;
protected String topic;
public AbstractBaseConsumer(String username, String password, String host, String authentication, Integer connectTimeout, Integer readTimeout, String group, String id, String filter, Integer limit, Integer timeoutQueryParamValue) {
this.host = host;
this.connectTimeout = connectTimeout;
this.readTimeout = readTimeout;
this.group = group;
this.id = id;
this.filter = filter;
this.limit = limit;
this.timeoutQueryParamValue = timeoutQueryParamValue;
if ("basic".equals(authentication)) {
if (username != null && password != null && username.length() > 0 && password.length() > 0) {
authorizationString = buildAuthorizationString(username, password);
} else {
throw new IllegalStateException("Authentication is set to basic but username or password is missing");
}
} else if ("noauth".equals(authentication)) {
authorizationString = null;
} else {
throw new IllegalStateException("Unknown authentication method: " + authentication);
}
}
protected void poll() {
String responseBody = performHttpOperation();
if (responseBody != null && !responseBody.startsWith("[]")) {
LOG.info("New message was fetched from MessageRouter.");
LOG.trace("Fetched message is\n{}", responseBody);
try {
String[] requests = new Gson().fromJson(responseBody, String[].class);
if (requests != null) {
for (String request : requests) {
if (request != null) {
requestHandler.handleRequest(topic,request);
}
}
} else {
LOG.warn("Deserialization of received message results in null array.", responseBody);
}
} catch (JsonParseException e) {
LOG.warn("Received message has bad format. Expected format is JSON.");
}
} else {
LOG.trace("No new message was fetched from MessageRouter.");
}
}
private String buildlUrlString(String topic) {
StringBuilder sb = new StringBuilder();
sb.append(host + "/events/" + topic + "/" + group + "/" + id);
sb.append("?timeout=" + timeoutQueryParamValue);
if (limit != null) {
sb.append("&limit=" + limit);
}
if (filter != null) {
sb.append("&filter=" + filter);
}
return sb.toString();
}
private String performHttpOperation() {
HttpURLConnection httpUrlConnection = null;
try {
httpUrlConnection = buildHttpURLConnection(url);
httpUrlConnection.setRequestMethod(REQUEST_METHOD);
httpUrlConnection.connect();
int status = httpUrlConnection.getResponseCode();
if (status < 300) {
return readFromStream(httpUrlConnection.getInputStream());
} else {
String response = readFromStream(httpUrlConnection.getErrorStream());
LOG.warn("Fetching message from MessageRouter on url {} failed with http status {}. Error message is\n{}.", url, status, response);
}
} catch (Exception e) {
LOG.warn("Exception was thrown during fetching message from MessageRouter on url {}.", url, e);
} finally {
if (httpUrlConnection != null) {
httpUrlConnection.disconnect();
}
}
return null;
}
private String buildAuthorizationString(String userName, String password) {
String basicAuthString = userName + ":" + password;
basicAuthString = Base64.getEncoder().encodeToString(basicAuthString.getBytes());
return "Basic " + basicAuthString;
}
protected HttpURLConnection buildHttpURLConnection(URL url) throws IOException {
HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();
if (authorizationString != null) {
httpUrlConnection.setRequestProperty("Authorization", authorizationString);
}
httpUrlConnection.setRequestProperty("Accept", "application/json");
httpUrlConnection.setUseCaches(false);
httpUrlConnection.setConnectTimeout(connectTimeout);
httpUrlConnection.setReadTimeout(readTimeout);
// Safely ignore hostname errors if host is an ip address or localhost
if (httpUrlConnection instanceof HttpsURLConnection) {
HttpsURLConnection conn = (HttpsURLConnection) httpUrlConnection;
conn.setHostnameVerifier(new AcceptIpAddressHostNameVerifier());
}
return httpUrlConnection;
}
protected String readFromStream(InputStream stream) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(stream));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
br.close();
return sb.toString();
}
@Override
public void registerHandler(String topic, RequestHandler requestHandler) {
this.topic = topic;
try {
this.url = new URL(buildlUrlString(topic));
} catch (MalformedURLException e) {
LOG.error("Topic " + topic + " resulted in MalformedURLException", e);
}
this.requestHandler = requestHandler;
}
@Override
public void close() throws Exception {
//BaseConsumer doesn't spawn any threads
}
}
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