TracingClientHttpRequestFactory.java

/**
 * Copyright (C) 2009-2010 Wilfred Springer
 * Changed by Ernst Vorsteveld
 *
 * 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 nl.iwelcome.connector.google;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.HexDump;
import org.apache.commons.io.output.TeeOutputStream;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.ClientHttpResponse;

public class TracingClientHttpRequestFactory implements ClientHttpRequestFactory {

	private final ClientHttpRequestFactory factory;

	public TracingClientHttpRequestFactory(ClientHttpRequestFactory factory) {
		this.factory = factory;
	}

	@Override
	public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException {
		return new LoggingClientHttpRequest(factory.createRequest(uri, httpMethod));
	}

	private static class LoggingClientHttpRequest implements ClientHttpRequest {

		private final ClientHttpRequest decorated;
		private final ByteArrayOutputStream body = new ByteArrayOutputStream();

		public LoggingClientHttpRequest(ClientHttpRequest request) {
			decorated = request;
		}

		@Override
		public HttpMethod getMethod() {
			return decorated.getMethod();
		}

		@Override
		public URI getURI() {
			return decorated.getURI();
		}

		@Override
		public ClientHttpResponse execute() throws IOException {
			for (Map.Entry<String, List<String>> entry : decorated.getHeaders().entrySet()) {
				System.err.println(entry.getKey() + ": " + entry.getValue());
			}
			if (body.size() != 0) {
				HexDump.dump(body.toByteArray(), 0, System.err, 0);
			}
			ClientHttpResponse response = decorated.execute();
			System.err.println(response.getHeaders().getContentType());
			return response;
		}

		@Override
		public OutputStream getBody() throws IOException {
			return new TeeOutputStream(decorated.getBody(), body);
		}

		@Override
		public HttpHeaders getHeaders() {
			return decorated.getHeaders();
		}
	}

}