/*
* Copyright (C) 2015 NuBits Developers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.matthewmitchell.peercoinj.shapeshift;
import com.google.common.base.Charsets;
import com.google.common.io.CharStreams;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.zip.GZIPInputStream;
import org.slf4j.LoggerFactory;
/**
* This class provides a way of asynchronously communicating over HTTP
*
* @author Matthew Mitchell
*/
public class AsyncHttpClient {
public static final ExecutorService executor = Executors.newSingleThreadExecutor();
public static final int CONNECTION_ERROR = -1;
public static final int PARSE_ERROR = -2;
public static final int API_ERROR = -3;
/**
* Make an HTTP post request
*
* @params url A string of the URL to make an HTTP post request to
* @params postData A string of the post data
* @params contentType A string of the content mime type to be used with the Content-Type header
* @params cbks Callbacks for successful or unsuccessful responses
*/
public void post(final String url, final String postData, final String contentType, final HttpResponseCallbacks cbks) {
executor.execute(new Runnable() {
@Override
public void run() {
try {
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(false);
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
connection.addRequestProperty("Accept-Encoding", "gzip");
if (postData != null) {
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", contentType);
connection.setDoOutput(true);
OutputStream os = connection.getOutputStream();
os.write(postData.getBytes(Charsets.UTF_8));
os.flush();
os.close();
}
connection.connect();
final int responseCode = connection.getResponseCode();
if (responseCode != HttpURLConnection.HTTP_OK) {
cbks.onFailure(responseCode, connection.getResponseMessage());
return;
}
final String contentEncoding = connection.getContentEncoding();
InputStream is = new BufferedInputStream(connection.getInputStream(), 1024);
if ("gzip".equalsIgnoreCase(contentEncoding))
is = new GZIPInputStream(is);
Reader reader = new InputStreamReader(is, Charsets.UTF_8);
String result = CharStreams.toString(reader);
cbks.onSuccess(result);
} catch (IOException ex) {
cbks.onFailure(CONNECTION_ERROR, "");
}
}
});
}
/**
* Make an HTTP get request
*
* @params url A string of the URL to make an HTTP get request to
* @params cbks Callbacks for successful or unsuccessful responses
*/
public void get(String url, HttpResponseCallbacks cbks) {
post(url, null, null, cbks);
}
public interface HttpResponseCallbacks {
/**
* Provides the string response on a 200 OK success
*/
public void onSuccess(String response);
/**
* Provides the string response and the HTTP code of a non 200 OK response
*/
public void onFailure(int responseCode, String error);
}
}