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/*-
* ============LICENSE_START=======================================================
* openECOMP : APP-C
* ================================================================================
* Copyright (C) 2017 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.openecomp.appc.adapter.dmaap;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
public class DmaapConsumer extends CommonHttpClient implements Consumer {
private static final EELFLogger LOG = EELFManager.getInstance().getLogger(DmaapConsumer.class);
// Default values
private static final int DEFAULT_TIMEOUT_MS = 15000;
private static final int DEFAULT_LIMIT = 1000;
private static final String HTTPS_PORT = ":3905";
private static final String URL_TEMPLATE = "%s/events/%s/%s/%s";
private List<String> urls;
private String filter;
private boolean useHttps = false;
public DmaapConsumer(Collection<String> hosts, String topicName, String consumerName, String consumerId) {
this(hosts, topicName, consumerName, consumerId, null);
}
public DmaapConsumer(Collection<String> hosts, String topicName, String consumerName, String consumerId,
String filter) {
this(hosts, topicName, consumerName, consumerId, filter, null, null);
}
public DmaapConsumer(Collection<String> hosts, String topicName, String consumerName, String consumerId,
String filter, String user, String password) {
urls = new ArrayList<String>();
for (String host : hosts) {
urls.add(String.format(URL_TEMPLATE, formatHostString(host), topicName, consumerName, consumerId));
}
this.filter = filter;
updateCredentials(user, password);
}
@Override
public void updateCredentials(String user, String pass) {
LOG.debug(String.format("Setting auth to %s for %s", user, this.toString()));
this.setBasicAuth(user, pass);
}
@Override
public List<String> fetch(int waitMs, int limit) {
LOG.debug(String.format("Fetching up to %d records with %dms wait on %s", limit, waitMs, this.toString()));
List<String> out = new ArrayList<String>();
try {
List<NameValuePair> urlParams = new ArrayList<NameValuePair>();
urlParams.add(new BasicNameValuePair("timeout", String.valueOf(waitMs)));
urlParams.add(new BasicNameValuePair("limit", String.valueOf(limit)));
if (filter != null) {
urlParams.add(new BasicNameValuePair("filter", filter));
}
URIBuilder builder = new URIBuilder(urls.get(0));
builder.setParameters(urlParams);
URI uri = builder.build();
LOG.info(String.format("GET %s", uri));
HttpGet request = getReq(uri, waitMs);
CloseableHttpResponse response = getClient().execute(request);
int httpStatus = response.getStatusLine().getStatusCode();
HttpEntity entity = response.getEntity();
String body = (entity != null) ? EntityUtils.toString(entity) : null;
LOG.debug(String.format("Request to %s completed with status %d and a body size of %s", uri, httpStatus,
(body != null ? body.length() : "null")));
response.close();
if (httpStatus == 200 && body != null) {
JSONArray json = new JSONArray(body);
LOG.info(String.format("Got %d messages from DMaaP", json.length()));
for (int i = 0; i < json.length(); i++) {
out.add(json.getString(i));
}
} else {
LOG.error(String.format("Did not get 200 from DMaaP. Got %d - %s", httpStatus, body));
sleep(waitMs);
}
} catch (Exception e) {
if (urls.size() > 1) {
String failedUrl = urls.remove(0);
urls.add(failedUrl);
LOG.debug(String.format("Moving host %s to the end of the pool. New primary host is %s", failedUrl,
urls.get(0)));
}
LOG.error(String.format("Got exception while querying DMaaP. Message: %s", e.getMessage()), e);
sleep(waitMs);
}
return out;
}
@Override
public List<String> fetch() {
return fetch(DEFAULT_TIMEOUT_MS, DEFAULT_LIMIT);
}
@Override
public String toString() {
String hostStr = (urls == null && !urls.isEmpty()) ? "N/A" : urls.get(0);
return String.format("Consumer listening to [%s]", hostStr);
}
@Override
public void useHttps(boolean yes) {
useHttps = yes;
}
private void sleep(int ms) {
LOG.info(String.format("Sleeping for %ds after failed request", ms / 1000));
try {
Thread.sleep(ms);
} catch (InterruptedException e1) {
LOG.error("Interrupted while sleeping");
}
}
public void close(){
//not used yet
}
}
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