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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 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.onap.dcae.apod.analytics.aai.service;
import com.google.common.base.Optional;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;
import org.onap.dcae.apod.analytics.aai.domain.config.AAIHttpClientConfig;
import org.onap.dcae.apod.analytics.common.utils.HTTPUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;
import java.util.Map;
import javax.annotation.Nonnull;
/**
* A concrete implementation for {@link AAIEnrichmentClient} which uses A&AI REST API to get A&AI Enrichment details
*
* @author Rajiv Singla . Creation Date: 9/18/2017.
*/
public class AAIEnrichmentClientImpl implements AAIEnrichmentClient {
private static final Logger LOG = LoggerFactory.getLogger(AAIEnrichmentClientImpl.class);
private final CloseableHttpClient closeableHttpClient;
private final String aaiProtocol;
private final String aaiHost;
private final Integer aaiHostPortNumber;
@Inject
public AAIEnrichmentClientImpl(@Assisted final AAIHttpClientConfig aaiHttpClientConfig,
final AAIHttpClientFactory aaiHttpClientFactory) {
final AAIHttpClient aaiHttpClient = aaiHttpClientFactory.create(aaiHttpClientConfig);
closeableHttpClient = aaiHttpClient.getAAIHttpClient();
aaiProtocol = aaiHttpClientConfig.getAaiProtocol();
aaiHost = aaiHttpClientConfig.getAaiHost();
aaiHostPortNumber = aaiHttpClientConfig.getAaiHostPortNumber();
}
/**
* Provides enrichment details from A&AI API and returns them as string. If no enrichment lookup fails returns null
*
* @param aaiAPIPath A&AI API Path
* @param queryParams A&AI Query Params map
* @param headers A&AI HTTP Headers
*
* @return Enrichment details from A&AI API and returns them as string. If enrichment lookup fails returns null
*/
@Override
public String getEnrichmentDetails(final String aaiAPIPath, final Map<String, String> queryParams,
final Map<String, String> headers) {
final URI enrichmentURI =
createAAIEnrichmentURI(aaiProtocol, aaiHost, aaiHostPortNumber, aaiAPIPath, queryParams);
if (enrichmentURI == null) {
return null;
}
// create new get request
final HttpGet getRequest = new HttpGet(enrichmentURI);
// add http headers
for (Map.Entry<String, String> headersEntry : headers.entrySet()) {
getRequest.addHeader(headersEntry.getKey(), headersEntry.getValue());
}
Optional<String> enrichmentDetails = Optional.absent();
// execute http get request
try {
enrichmentDetails = closeableHttpClient.execute(getRequest, aaiResponseHandler());
} catch (IOException ex) {
LOG.error("Failed to get A&AI Enrichment Details for A&AI Enrichment URI: {} A&AI Error: {}",
enrichmentURI, ex);
}
// return response
if (enrichmentDetails.isPresent()) {
return enrichmentDetails.get();
} else {
return null;
}
}
/**
* Create A&AI API Enrichment URI. If invalid URI - null will be returned
*
* @param protocol A&AI API protocol
* @param hostName A&AI API hostname
* @param portNumber A&AI API port number
* @param path A&AI API path
* @param queryParams A&AI API query parameters
*
* @return A&AI API Enrichment URI
*/
private URI createAAIEnrichmentURI(final String protocol, final String hostName,
final Integer portNumber, final String path,
Map<String, String> queryParams) {
final URIBuilder uriBuilder = new URIBuilder().setScheme(protocol).setHost(hostName).setPort(portNumber)
.setPath(path);
// creates custom query string which is not encoded
final String customQuery = createCustomQuery(queryParams);
if (StringUtils.isNoneBlank(customQuery)) {
uriBuilder.setCustomQuery(customQuery);
}
URI enrichmentURI = null;
try {
enrichmentURI = uriBuilder.build();
} catch (URISyntaxException e) {
LOG.error("URI Syntax Exception when creating A&AI Enrichment URI. " +
"Protocol: {}, HostName: {}, Port: {}, Path: {}, Custom Query String: {}, Exception: {}",
protocol, hostName, portNumber, path, customQuery, e);
}
LOG.trace("Created A&AI Enrichment URI: {}", enrichmentURI);
return enrichmentURI;
}
/**
* Creates Custom Query string to be used for A&AI API URI as A&AI currently does not expect encoded
* query params.
*
* @param queryParams query param map
*
* @return custom query string which does not encode query param values
*/
private static String createCustomQuery(@Nonnull final Map<String, String> queryParams) {
final StringBuilder queryStringBuilder = new StringBuilder("");
final Iterator<Map.Entry<String, String>> queryParamIterator = queryParams.entrySet().iterator();
while (queryParamIterator.hasNext()) {
final Map.Entry<String, String> queryParamsEntry = queryParamIterator.next();
queryStringBuilder.append(queryParamsEntry.getKey());
queryStringBuilder.append("=");
queryStringBuilder.append(queryParamsEntry.getValue());
if (queryParamIterator.hasNext()) {
queryStringBuilder.append("&");
}
}
return queryStringBuilder.toString();
}
/**
* Response Handler for A&AI Enrichment API
*
* @return Response Handler that
*/
static ResponseHandler<Optional<String>> aaiResponseHandler() {
return new ResponseHandler<Optional<String>>() {
@Override
public Optional<String> handleResponse(final HttpResponse response) throws IOException {
final int responseCode = response.getStatusLine().getStatusCode();
final HttpEntity responseEntity = response.getEntity();
if (HTTPUtils.isSuccessfulResponseCode(responseCode) && null != responseEntity) {
final String aaiResponse = EntityUtils.toString(responseEntity);
return Optional.of(aaiResponse);
} else {
String aaiResponse = responseEntity != null ? EntityUtils.toString(responseEntity) : "";
LOG.error("Unable to fetch response from A&AI API. A&AI Response Code: {}, " +
"A&AI Response Message: {}", responseCode, aaiResponse);
return Optional.absent();
}
}
};
}
}
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