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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.dcaegen2.services.pmmapper.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Optional;
import java.util.UUID;
import java.util.stream.Collectors;
import org.onap.dcaegen2.services.pmmapper.exceptions.ServerResponseException;
import org.onap.dcaegen2.services.pmmapper.model.MapperConfig;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.onap.logging.ref.slf4j.ONAPLogConstants;
import org.slf4j.LoggerFactory;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import org.jboss.logging.MDC;
public class RequestSender {
private static final int MAX_RETRIES = 5;
private static final int RETRY_INTERVAL = 1000;
private static final String SERVER_ERROR_MESSAGE = "Error on Server";
private static final int ERROR_START_RANGE = 300;
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(RequestSender.class));
public static final String DELETE = "DELETE";
public static final String DEFAULT_CONTENT_TYPE = "text/plain";
public static final int DEFAULT_READ_TIMEOUT = 5000;
/**
* Works just like {@link RequestSender#send(method,urlString)}, except {@code method }
* is set to {@code GET} by default.
* @see RequestSender#send(String,String,String)
*/
public String send(final String urlString) throws Exception {
return send("GET", urlString);
}
/**
* Works just like {@link RequestSender#send(method,urlString,body)}, except {@code body }
* is set to empty String by default.
* @see RequestSender#send(String,String,String)
*/
public String send(String method, final String urlString) throws Exception {
return send(method,urlString,"");
}
/**
* Works just like {@link RequestSender#send(method,urlString,body, basicAuth)}, except {@code basicAuth }
* is set to empty String by default.
* @see RequestSender#send(String,String,String,String)
*/
public String send(String method, final String urlString, final String body) throws Exception {
return send(method,urlString,body,"");
}
/**
* Sends an http request to a given endpoint.
* @param method of the outbound request
* @param urlString representing given endpoint
* @param body of the request as json
* @param encodedCredentials base64-encoded username password credentials
* @return http response body
* @throws Exception
*/
public String send(String method, final String urlString, final String body, final String encodedCredentials) throws Exception {
final UUID invocationID = logger.invoke(ONAPLogConstants.InvocationMode.SYNCHRONOUS);
String requestID = Optional.ofNullable((String)MDC.get(ONAPLogConstants.MDCs.REQUEST_ID))
.orElse( UUID.randomUUID().toString());
String result = "";
for (int i = 1; i <= MAX_RETRIES; i++) {
final URL url = new URL(urlString);
final HttpURLConnection connection = getHttpURLConnection(method, url, invocationID, requestID);
if("https".equalsIgnoreCase(url.getProtocol())) {
HttpsURLConnection.setDefaultSSLSocketFactory(SSLContext.getDefault().getSocketFactory());
}
if(!encodedCredentials.isEmpty()) {
connection.setRequestProperty("Authorization", "Basic " + encodedCredentials);
}
if(!body.isEmpty()) {
setMessageBody(connection, body);
}
logger.unwrap().info("Sending {} request to {}.", method, urlString);
try (InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is))) {
result = reader.lines()
.collect(Collectors.joining("\n"));
int responseCode = connection.getResponseCode();
if (!(isWithinErrorRange(responseCode))) {
logger.unwrap().info("Response code: {}, Server Response Received:\n{}",responseCode, result);
break;
}
} catch (Exception e) {
if (retryLimitReached(i)) {
logger.unwrap().error("Execution error: {}", connection.getResponseMessage(), e);
throw new ServerResponseException(SERVER_ERROR_MESSAGE + ": " + connection.getResponseMessage(), e);
}
}
Thread.sleep(RETRY_INTERVAL);
}
return result;
}
private HttpURLConnection getHttpURLConnection(String method, URL url, UUID invocationID, String requestID) throws IOException {
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setReadTimeout(DEFAULT_READ_TIMEOUT);
connection.setRequestProperty(ONAPLogConstants.Headers.REQUEST_ID, requestID);
connection.setRequestProperty(ONAPLogConstants.Headers.INVOCATION_ID, invocationID.toString());
connection.setRequestProperty(ONAPLogConstants.Headers.PARTNER_NAME, MapperConfig.CLIENT_NAME);
connection.setRequestMethod(method);
return connection;
}
private void setMessageBody(HttpURLConnection connection, String body) throws IOException {
connection.setRequestProperty("Content-Type",DEFAULT_CONTENT_TYPE);
connection.setDoOutput(true);
OutputStream outputStream = connection.getOutputStream();
outputStream.write(body.getBytes(StandardCharsets.UTF_8));
outputStream.flush();
outputStream.close();
}
private boolean retryLimitReached(final int retryCount) {
return retryCount >= MAX_RETRIES;
}
private boolean isWithinErrorRange(final int responseCode) {
return responseCode >= ERROR_START_RANGE;
}
}
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