com.predic8.membrane.core.exchange.snapshots.MessageSnapshot Maven / Gradle / Ivy
/* Copyright 2018 predic8 GmbH, www.predic8.com
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. */
package com.predic8.membrane.core.exchange.snapshots;
import com.predic8.membrane.core.http.*;
import com.predic8.membrane.core.util.functionalInterfaces.Consumer;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.input.CountingInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Stream;
public class MessageSnapshot {
Map header;
byte[] body = null;
/**
* @param msg the message to snapshot
* @param bodyCopiedCallback will be called once the body has been filled. if null, the body stream will be read
* into memory immediately.
* @param aes parameter for the callback
* @param strategy how to handle body lengths exceeding the {@code limit}.
* @param limit maximum length of the body.
*/
public MessageSnapshot(Message msg, Consumer bodyCopiedCallback, AbstractExchangeSnapshot aes, BodyCollectingMessageObserver.Strategy strategy, long limit) throws IOException {
header = new HashMap<>();
Stream.of(msg.getHeader().getAllHeaderFields()).forEach(headerField -> {
String key = headerField.getHeaderName().toString();
String value = header.get(key);
if (value != null)
header.put(key, value + ", " + headerField.getValue());
else
header.put(key, headerField.getValue());
});
if (bodyCopiedCallback == null) {
body = IOUtils.toByteArray(new CountingInputStream(msg.getBodyAsStreamDecoded()) {
@Override
public int read(byte[] b) throws IOException {
if (limit != -1 && getCount() > limit)
switch (strategy) {
case TRUNCATE:
return -1;
case ERROR:
throw new IOException("Body too large. (limit = " + limit + ")");
}
return super.read(b);
}
});
} else {
msg.addObserver(new SnapshottingObserver(strategy, limit, bodyCopiedCallback, aes));
}
}
public MessageSnapshot() {
}
public Map getHeader() {
return header;
}
public void setHeader(Map header) {
this.header = header;
}
public byte[] getBody() {
return body;
}
public void setBody(byte[] body) {
this.body = body;
}
public Header convertHeader(){
Header result = new Header();
header.keySet().stream().forEach(key -> result.add(key,header.get(key)));
return result;
}
public AbstractBody convertBody(){
if(body == null)
return new EmptyBody();
return new Body(body);
}
private class SnapshottingObserver extends BodyCollectingMessageObserver {
private final Consumer bodyCopiedCallback;
private final AbstractExchangeSnapshot aes;
public SnapshottingObserver(Strategy strategy, long limit, Consumer bodyCopiedCallback, AbstractExchangeSnapshot aes) {
super(strategy, limit);
this.bodyCopiedCallback = bodyCopiedCallback;
this.aes = aes;
}
@Override
public void bodyRequested(AbstractBody body) {
}
@Override
public void bodyComplete(AbstractBody body2) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
InputStream body1 = getBody(body2).getContentAsStream();
IOUtils.copy(body1, baos);
} catch (IOException e) {
throw new RuntimeException(e);
}
body = baos.toByteArray();
try {
bodyCopiedCallback.call(aes);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}