/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.http;
import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import com.google.common.io.InputSupplier;
import com.google.gson.Gson;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferInputStream;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import java.util.List;
/**
* InternalHttpResponder is used when a handler is being called internally by some other handler, and thus there
* is no need to go through the network. It stores the status code and content in memory and returns them when asked.
*/
public class InternalHttpResponder implements HttpResponder {
private int statusCode;
private List<ChannelBuffer> contentChunks;
private InputSupplier<? extends InputStream> inputSupplier;
private static final Gson gson = new Gson();
public InternalHttpResponder() {
contentChunks = Lists.newLinkedList();
statusCode = 0;
}
@Override
public void sendJson(HttpResponseStatus status, Object object) {
sendJson(status, object, object.getClass());
}
@Override
public void sendJson(HttpResponseStatus status, Object object, Type type) {
sendJson(status, object, type, gson);
}
@Override
public void sendJson(HttpResponseStatus status, Object object, Type type, Gson gson) {
setResponseContent(status, gson.toJson(object, type).getBytes(Charsets.UTF_8));
}
@Override
public void sendString(HttpResponseStatus status, String data) {
if (data == null) {
sendStatus(status);
} else {
setResponseContent(status, data.getBytes(Charsets.UTF_8));
}
}
@Override
public void sendStatus(HttpResponseStatus status) {
statusCode = status.getCode();
}
@Override
public void sendStatus(HttpResponseStatus status, Multimap<String, String> headers) {
statusCode = status.getCode();
}
@Override
public void sendByteArray(HttpResponseStatus status, byte[] bytes, Multimap<String, String> headers) {
setResponseContent(status, bytes);
}
@Override
public void sendBytes(HttpResponseStatus status, ByteBuffer buffer, Multimap<String, String> headers) {
byte[] bytes = new byte[buffer.remaining()];
int position = buffer.position();
buffer.get(bytes);
buffer.position(position);
setResponseContent(status, bytes);
}
@Override
public void sendError(HttpResponseStatus status, String errorMessage) {
Preconditions.checkArgument(!status.equals(HttpResponseStatus.OK), "Response status cannot be OK for errors");
setResponseContent(status, errorMessage.getBytes(Charsets.UTF_8));
}
@Override
public void sendChunkStart(HttpResponseStatus status, Multimap<String, String> headers) {
statusCode = status.getCode();
contentChunks.clear();
}
@Override
public void sendChunk(ChannelBuffer content) {
contentChunks.add(content);
}
@Override
public void sendChunkEnd() {
ChannelBuffer[] chunks = new ChannelBuffer[contentChunks.size()];
contentChunks.toArray(chunks);
final ChannelBuffer body = ChannelBuffers.wrappedBuffer(chunks);
body.markReaderIndex();
inputSupplier = new InputSupplier<InputStream>() {
@Override
public InputStream getInput() throws IOException {
body.resetReaderIndex();
return new ChannelBufferInputStream(body);
}
};
}
@Override
public void sendContent(HttpResponseStatus status, ChannelBuffer content, String contentType,
Multimap<String, String> headers) {
setResponseContent(status, content.array());
}
private void setResponseContent(HttpResponseStatus status, byte[] content) {
statusCode = status.getCode();
inputSupplier = ByteStreams.newInputStreamSupplier(content);
}
@Override
public void sendFile(File file, Multimap<String, String> headers) {
statusCode = HttpResponseStatus.OK.getCode();
inputSupplier = Files.newInputStreamSupplier(file);
}
public InternalHttpResponse getResponse() {
return new BasicInternalHttpResponse(statusCode, inputSupplier);
}
}