org.deephacks.graphene.Http.java Source code

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Here is the source code for org.deephacks.graphene.Http.java

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/**
 * 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 org.deephacks.graphene;

import com.google.common.io.CharStreams;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Generic http client.
 */
public class Http {
    public static final int BAD_REQUEST = 400;
    public static final String CONTENT_TYPE = "Content-Type";
    public final static String APPLICATION_JSON = "application/json";
    private final String address;

    public Http(String host, int port) {
        this.address = "http://" + host + ":" + port;
    }

    public String get(String path) {
        return request("GET", path);
    }

    public String post(String path) {
        return request("POST", path);
    }

    private String request(String method, String path) {
        HttpURLConnection conn = null;
        try {
            URL url = new URL(address + path);
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod(method);
            conn.setRequestProperty(CONTENT_TYPE, APPLICATION_JSON);
            conn.setDoOutput(true);
            try (OutputStream os = conn.getOutputStream()) {
                os.flush();
            }
            if (conn.getResponseCode() >= BAD_REQUEST) {
                String body = CharStreams.toString(new InputStreamReader(conn.getErrorStream()));

                throw new RuntimeException("HTTP error code " + conn.getResponseCode() + ". "
                        + conn.getResponseMessage() + ". " + body);
            }
            return CharStreams.toString(new InputStreamReader(conn.getInputStream()));
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
        }
    }
}