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/*-
* ============LICENSE_START======================================================================
* Copyright (C) 2020-2021 Nokia. 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.dcaegen2.collectors.datafile.http;
import org.jetbrains.annotations.NotNull;
import org.onap.dcaegen2.collectors.datafile.exceptions.DatafileTaskException;
import org.onap.dcaegen2.collectors.datafile.commons.FileCollectClient;
import org.onap.dcaegen2.collectors.datafile.commons.FileServerData;
import org.onap.dcaegen2.collectors.datafile.exceptions.NonRetryableDatafileTaskException;
import org.onap.dcaegen2.collectors.datafile.service.HttpUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.Disposable;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.netty.http.client.HttpClient;
import reactor.netty.http.client.HttpClientResponse;
import reactor.netty.resources.ConnectionProvider;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;
/**
* Gets file from PNF with HTTP protocol.
*
* @author <a href="mailto:krzysztof.gajewski@nokia.com">Krzysztof Gajewski</a>
*/
public class DfcHttpClient implements FileCollectClient {
//Be aware to be less than ScheduledTasks.NUMBER_OF_WORKER_THREADS
private static final int MAX_NUMBER_OF_CONNECTIONS = 200;
private static final Logger logger = LoggerFactory.getLogger(DfcHttpClient.class);
private static final ConnectionProvider pool = ConnectionProvider.create("default", MAX_NUMBER_OF_CONNECTIONS);
private final FileServerData fileServerData;
private Disposable disposableClient;
protected HttpClient client;
public DfcHttpClient(FileServerData fileServerData) {
this.fileServerData = fileServerData;
}
@Override public void open() throws DatafileTaskException {
logger.trace("Setting httpClient for file download.");
String authorizationContent = getAuthorizationContent();
this.client = HttpClient.create(pool).keepAlive(true).headers(
h -> h.add("Authorization", authorizationContent));
logger.trace("httpClient, auth header was set.");
}
protected String getAuthorizationContent() throws DatafileTaskException {
String jwtToken = HttpUtils.getJWTToken(fileServerData);
if (!jwtToken.isEmpty()) {
return HttpUtils.jwtAuthContent(jwtToken);
}
if (!HttpUtils.isBasicAuthDataFilled(fileServerData)) {
throw new DatafileTaskException("Not sufficient basic auth data for file.");
}
return HttpUtils.basicAuthContent(this.fileServerData.userId(), this.fileServerData.password());
}
@Override public void collectFile(String remoteFile, Path localFile) throws DatafileTaskException {
logger.trace("Prepare to collectFile {}", localFile);
CountDownLatch latch = new CountDownLatch(1);
final AtomicReference<Exception> errorMessage = new AtomicReference<>();
Consumer<Throwable> onError = processFailedConnectionWithServer(latch, errorMessage);
Consumer<InputStream> onSuccess = processDataFromServer(localFile, latch, errorMessage);
Flux<InputStream> responseContent = getServerResponse(remoteFile);
disposableClient = responseContent.subscribe(onSuccess, onError);
try {
latch.await();
} catch (InterruptedException e) {
throw new DatafileTaskException("Interrupted exception after datafile download - ", e);
}
if (isDownloadFailed(errorMessage)) {
if (errorMessage.get() instanceof NonRetryableDatafileTaskException) {
throw (NonRetryableDatafileTaskException) errorMessage.get();
}
throw (DatafileTaskException) errorMessage.get();
}
logger.trace("HTTP collectFile OK");
}
protected boolean isDownloadFailed(AtomicReference<Exception> errorMessage) {
return (errorMessage.get() != null);
}
@NotNull protected Consumer<Throwable> processFailedConnectionWithServer(CountDownLatch latch, AtomicReference<Exception> errorMessages) {
return (Throwable response) -> {
Exception e = new Exception("Error in connection has occurred during file download", response);
errorMessages.set(new DatafileTaskException(response.getMessage(), e));
if (response instanceof NonRetryableDatafileTaskException) {
errorMessages.set(new NonRetryableDatafileTaskException(response.getMessage(), e));
}
latch.countDown();
};
}
@NotNull protected Consumer<InputStream> processDataFromServer(Path localFile, CountDownLatch latch,
AtomicReference<Exception> errorMessages) {
return (InputStream response) -> {
logger.trace("Starting to process response.");
try {
long numBytes = Files.copy(response, localFile);
logger.trace("Transmission was successful - {} bytes downloaded.", numBytes);
logger.trace("CollectFile fetched: {}", localFile);
response.close();
} catch (IOException e) {
errorMessages.set(new DatafileTaskException("Error fetching file with", e));
} finally {
latch.countDown();
}
};
}
protected Flux<InputStream> getServerResponse(String remoteFile) {
return client.get()
.uri(HttpUtils.prepareHttpUri(fileServerData, remoteFile))
.response((responseReceiver, byteBufFlux) -> {
logger.trace("HTTP response status - {}", responseReceiver.status());
if(isResponseOk(responseReceiver)){
return byteBufFlux.aggregate().asInputStream();
}
if (isErrorInConnection(responseReceiver)) {
return Mono.error(new NonRetryableDatafileTaskException(
HttpUtils.nonRetryableResponse(getResponseCode(responseReceiver))));
}
return Mono.error(new DatafileTaskException(
HttpUtils.retryableResponse(getResponseCode(responseReceiver))));
});
}
protected boolean isResponseOk(HttpClientResponse httpClientResponse) {
return getResponseCode(httpClientResponse) == 200;
}
private int getResponseCode(HttpClientResponse responseReceiver) {
return responseReceiver.status().code();
}
protected boolean isErrorInConnection(HttpClientResponse httpClientResponse) {
return getResponseCode(httpClientResponse) >= 400;
}
@Override public void close() {
logger.trace("Starting http client disposal.");
disposableClient.dispose();
logger.trace("Http client disposed.");
}
}
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