| package net.onrc.onos.apps.sdnip; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.net.HttpURLConnection; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.nio.charset.StandardCharsets; |
| |
| import org.apache.commons.httpclient.ConnectTimeoutException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A simple HTTP client. It is used to make REST calls to the BGPd process. |
| */ |
| public final class RestClient { |
| private static final Logger log = LoggerFactory.getLogger(RestClient.class); |
| |
| /** |
| * Default constructor. |
| */ |
| private RestClient() { |
| // Private constructor to prevent instantiation |
| } |
| |
| /** |
| * Issues a HTTP GET request to the specified URL. |
| * |
| * @param strUrl the URL to make the request to |
| * @return a String containing any data returned by the server |
| */ |
| public static String get(String strUrl) { |
| StringBuilder response = new StringBuilder(); |
| |
| try { |
| URL url = new URL(strUrl); |
| HttpURLConnection conn = (HttpURLConnection) url.openConnection(); |
| conn.setConnectTimeout(2 * 1000); // 2 seconds |
| conn.setRequestMethod("GET"); |
| conn.setRequestProperty("Accept", "application/json"); |
| |
| if (conn.getResponseCode() != 200) { |
| // XXX bad. RestClient API needs to be redesigned |
| throw new IOException("Failed : HTTP error code : " |
| + conn.getResponseCode()); |
| } |
| |
| if (!conn.getContentType().equals("application/json")) { |
| log.warn("The content received from {} is not json", strUrl); |
| } |
| |
| BufferedReader br = new BufferedReader(new InputStreamReader( |
| conn.getInputStream(), StandardCharsets.UTF_8)); |
| String line; |
| while ((line = br.readLine()) != null) { |
| response.append(line); |
| } |
| |
| br.close(); |
| conn.disconnect(); |
| |
| } catch (MalformedURLException e) { |
| log.error("Malformed URL for GET request", e); |
| } catch (ConnectTimeoutException e) { |
| log.warn("Couldn't connect to the remote REST server", e); |
| } catch (IOException e) { |
| log.warn("Couldn't connect to the remote REST server", e); |
| } |
| |
| return response.toString(); |
| } |
| |
| /** |
| * Issues a HTTP POST request to the specified URL. |
| * |
| * @param strUrl the URL to make the request to |
| */ |
| public static void post(String strUrl) { |
| |
| try { |
| URL url = new URL(strUrl); |
| HttpURLConnection conn = (HttpURLConnection) url.openConnection(); |
| conn.setDoOutput(true); |
| conn.setRequestMethod("POST"); |
| conn.setRequestProperty("Content-Type", "application/json"); |
| |
| if (conn.getResponseCode() != 200) { |
| // XXX bad. RestClient API needs to be redesigned |
| throw new IOException("Failed : HTTP error code : " |
| + conn.getResponseCode()); |
| } |
| |
| conn.disconnect(); |
| |
| } catch (MalformedURLException e) { |
| log.error("Malformed URL for GET request", e); |
| } catch (IOException e) { |
| log.warn("Couldn't connect to the remote REST server", e); |
| } |
| } |
| |
| /** |
| * Issues a HTTP DELETE request to the specified URL. |
| * |
| * @param strUrl the URL to make the request to |
| */ |
| public static void delete(String strUrl) { |
| |
| try { |
| URL url = new URL(strUrl); |
| HttpURLConnection conn = (HttpURLConnection) url.openConnection(); |
| conn.setRequestMethod("DELETE"); |
| conn.setRequestProperty("Accept", "application/json"); |
| |
| if (conn.getResponseCode() != 200) { |
| // XXX bad. RestClient API needs to be redesigned |
| throw new IOException("Failed : HTTP error code : " |
| + conn.getResponseCode()); |
| } |
| |
| conn.disconnect(); |
| |
| } catch (MalformedURLException e) { |
| log.error("Malformed URL for GET request", e); |
| } catch (IOException e) { |
| log.warn("Couldn't connect to the remote REST server", e); |
| } |
| } |
| } |