Package ch.ethz.inf.vs.californium.examples

Source Code of ch.ethz.inf.vs.californium.examples.ExampleClient

/*******************************************************************************
* Copyright (c) 2012, Institute for Pervasive Computing, ETH Zurich.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Californium (Cf) CoAP framework.
******************************************************************************/
package ch.ethz.inf.vs.californium.examples;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.logging.Level;

import ch.ethz.inf.vs.californium.CaliforniumLogger;
import ch.ethz.inf.vs.californium.Utils;
import ch.ethz.inf.vs.californium.coap.CoAP;
import ch.ethz.inf.vs.californium.coap.MediaTypeRegistry;
import ch.ethz.inf.vs.californium.coap.Request;
import ch.ethz.inf.vs.californium.coap.Response;
import ch.ethz.inf.vs.californium.network.CoAPEndpoint;
import ch.ethz.inf.vs.californium.network.Endpoint;
import ch.ethz.inf.vs.californium.network.EndpointManager;
import ch.ethz.inf.vs.californium.network.EndpointManager.ClientMessageDeliverer;
import ch.ethz.inf.vs.californium.network.config.NetworkConfig;
import ch.ethz.inf.vs.scandium.DTLSConnector;
import ch.ethz.inf.vs.scandium.ScandiumLogger;

/**
* This class implements a simple CoAP client for testing purposes. Usage:
* <p>
* {@code java -jar SampleClient.jar [-l] METHOD URI [PAYLOAD]}
* <ul>
* <li>METHOD: {GET, POST, PUT, DELETE, DISCOVER, OBSERVE}
* <li>URI: The URI to the remote endpoint or resource}
* <li>PAYLOAD: The data to send with the request}
* </ul>
* Options:
* <ul>
* <li>-l: Loop for multiple responses}
* </ul>
* Examples:
* <ul>
* <li>{@code SampleClient DISCOVER coap://localhost}
* <li>{@code SampleClient POST coap://someServer.org:5683 my data}
* </ul>
* @author Dominique Im Obersteg, Daniel Pauli, and Matthias Kovatsch
*/
public class ExampleClient {

  static {
    CaliforniumLogger.initialize();
    CaliforniumLogger.setLevel(Level.WARNING);
   
    ScandiumLogger.initialize();
    ScandiumLogger.setLevel(Level.FINER);
  }
 
  // resource URI path used for discovery
  private static final String DISCOVERY_RESOURCE = "/.well-known/core";

  // indices of command line parameters
  private static final int IDX_METHOD          = 0;
  private static final int IDX_URI             = 1;
  private static final int IDX_PAYLOAD         = 2;

  // exit codes for runtime errors
  private static final int ERR_MISSING_METHOD  = 1;
  private static final int ERR_UNKNOWN_METHOD  = 2;
  private static final int ERR_MISSING_URI     = 3;
  private static final int ERR_BAD_URI         = 4;
  private static final int ERR_REQUEST_FAILED  = 5;
  private static final int ERR_RESPONSE_FAILED = 6;


  // initialize parameters
  static String method = null;
  static URI uri = null;
  static String payload = "";
  static boolean loop = false;

  // for coaps
  private static Endpoint dtlsEndpoint;
 
  /*
   * Main method of this client.
   */
  public static void main(String[] args) throws IOException {
   
    // display help if no parameters specified
    if (args.length == 0) {
      printInfo();
      return;
    }
   
    // input parameters
    int idx = 0;
    for (String arg : args) {
      if (arg.startsWith("-")) {
        if (arg.equals("-l")) {
          loop = true;
        } else {
          System.out.println("Unrecognized option: " + arg);
        }
      } else {
        switch (idx) {
        case IDX_METHOD:
          method = arg.toUpperCase();
          break;
        case IDX_URI:
          try {
            uri = new URI(arg);
          } catch (URISyntaxException e) {
            System.err.println("Failed to parse URI: " + e.getMessage());
            System.exit(ERR_BAD_URI);
          }
          break;
        case IDX_PAYLOAD:
          payload = arg;
          break;
        default:
          System.out.println("Unexpected argument: " + arg);
        }
        ++idx;
      }
    }

    // check if mandatory parameters specified
    if (method == null) {
      System.err.println("Method not specified");
      System.exit(ERR_MISSING_METHOD);
    }
    if (uri == null) {
      System.err.println("URI not specified");
      System.exit(ERR_MISSING_URI);
    }
   
    // create request according to specified method
    Request request = newRequest(method);

    // set request URI
    if (method.equals("DISCOVER") && (uri.getPath() == null || uri.getPath().isEmpty() || uri.getPath().equals("/"))) {
      // add discovery resource path to URI
      try {
        uri = new URI(uri.getScheme(), uri.getAuthority(), DISCOVERY_RESOURCE, uri.getQuery());
       
      } catch (URISyntaxException e) {
        System.err.println("Failed to parse URI: " + e.getMessage());
        System.exit(ERR_BAD_URI);
      }
    }
   
    request.setURI(uri);
    request.setPayload(payload);
    request.getOptions().setContentFormat(MediaTypeRegistry.TEXT_PLAIN);
   
    if (request.getScheme().equals(CoAP.COAP_SECURE_URI_SCHEME)) {
      dtlsEndpoint = new CoAPEndpoint(new DTLSConnector(new InetSocketAddress(0)), NetworkConfig.getStandard());
      dtlsEndpoint.setMessageDeliverer(new ClientMessageDeliverer());
      dtlsEndpoint.start();
      EndpointManager.getEndpointManager().setDefaultSecureEndpoint(dtlsEndpoint);
    }
   
    // execute request
    try {
      request.send();

      // loop for receiving multiple responses
      do {
 
        // receive response
        Response response = null;
        try {
          response = request.waitForResponse();
        } catch (InterruptedException e) {
          System.err.println("Failed to receive response: " + e.getMessage());
          System.exit(ERR_RESPONSE_FAILED);
        }
 
        // output response
 
        if (response != null) {
 
          System.out.println(Utils.prettyPrint(response));
          System.out.println("Time elapsed (ms): " + response.getRTT());
 
          // check of response contains resources
          if (response.getOptions().hasContentFormat(MediaTypeRegistry.APPLICATION_LINK_FORMAT)) {
 
            String linkFormat = response.getPayloadString();
 
            // output discovered resources
            System.out.println("\nDiscovered resources:");
            System.out.println(linkFormat);
 
          } else {
 
            // check if link format was expected by client
            if (method.equals("DISCOVER")) {
              System.out.println("Server error: Link format not specified");
            }
          }
 
        } else {
 
          // no response received 
          System.err.println("Request timed out");
          break;
        }
 
      } while (loop);
   
    if (dtlsEndpoint!=null) {
      dtlsEndpoint.stop();
    }
     
    } catch (Exception e) {
      System.err.println("Failed to execute request: " + e.getMessage());
      System.exit(ERR_REQUEST_FAILED);
    }
  }

  /*
   * Outputs user guide of this program.
   */
  public static void printInfo() {
    System.out.println("Californium (Cf) Example Client");
    System.out.println("(c) 2014, Institute for Pervasive Computing, ETH Zurich");
    System.out.println();
    System.out.println("Usage: " + ExampleClient.class.getSimpleName() + " [-l] METHOD URI [PAYLOAD]");
    System.out.println("  METHOD  : {GET, POST, PUT, DELETE, DISCOVER, OBSERVE}");
    System.out.println("  URI     : The CoAP URI of the remote endpoint or resource");
    System.out.println("  PAYLOAD : The data to send with the request");
    System.out.println("Options:");
    System.out.println("  -l      : Loop for multiple responses");
    System.out.println("           (automatic for OBSERVE and separate responses)");
    System.out.println();
    System.out.println("Examples:");
    System.out.println("  ExampleClient DISCOVER coap://localhost");
    System.out.println("  ExampleClient POST coap://vs0.inf.ethz.ch:5683/storage my data");
  }

  /*
   * Instantiates a new request based on a string describing a method.
   *
   * @return A new request object, or null if method not recognized
   */
  private static Request newRequest(String method) {
    if (method.equals("GET")) {
      return Request.newGet();
    } else if (method.equals("POST")) {
      return Request.newPost();
    } else if (method.equals("PUT")) {
      return Request.newPut();
    } else if (method.equals("DELETE")) {
      return Request.newDelete();
    } else if (method.equals("DISCOVER")) {
      return Request.newGet();
    } else if (method.equals("OBSERVE")) {
      Request request = Request.newGet();
      request.setObserve();
      loop = true;
      return request;
    } else {
      System.err.println("Unknown method: " + method);
      System.exit(ERR_UNKNOWN_METHOD);
      return null;
    }
  }

}
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