/**
*
* Copyright (c) 2009-2013 Freedomotic team http://freedomotic.com
*
* This file is part of Freedomotic
*
* 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 2, 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
* Freedomotic; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*/
package it.cicolella.ethrly;
import it.freedomotic.api.EventTemplate;
import it.freedomotic.api.Protocol;
import it.freedomotic.app.Freedomotic;
import it.freedomotic.events.ProtocolRead;
import it.freedomotic.exceptions.UnableToExecuteException;
import it.freedomotic.reactions.Command;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ConnectException;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
import org.apache.commons.codec.binary.Base64;
public class DevantechEthRly extends Protocol {
private static final Logger LOG = Logger.getLogger(DevantechEthRly.class.getName());
Map<String, Board> devices = new HashMap<String, Board>();
private static int BOARD_NUMBER = 1;
private static int POLLING_TIME = 1000;
private Socket socket = null;
private DataOutputStream outputStream = null;
private BufferedReader inputStream = null;
private String[] address = null;
private int SOCKET_TIMEOUT = configuration.getIntProperty("socket-timeout", 1000);
private String GET_STATUS_URL = configuration.getStringProperty("get-status-url", "status.xml");
private String CHANGE_STATE_RELAY_URL = configuration.getStringProperty("change-state-relay-url", "leds.cgi?led=");
/**
* Initializations
*/
public DevantechEthRly() {
super("Devantech EthRly", "/devantech-eth-rly/devantech-eth-rly-manifest.xml");
setPollingWait(POLLING_TIME);
}
private void loadBoards() {
if (devices == null) {
devices = new HashMap<String, Board>();
}
setDescription("Reading status changes from"); //empty description
for (int i = 0; i < BOARD_NUMBER; i++) {
String ipToQuery;
String ledTag;
String digitalInputTag;
String analogInputTag;
String autoConfiguration;
String objectClass;
String alias;
String username;
String password;
String httpAuthentication;
int portToQuery;
int relayNumber;
// filter the tuples with "object.class" property
String result = configuration.getTuples().getProperty(i, "object.class");
// if the tuple hasn't an "object.class" property it's a board configuration one
if (result == null) {
ipToQuery = configuration.getTuples().getStringProperty(i, "ip-to-query", "192.168.1.201");
portToQuery = configuration.getTuples().getIntProperty(i, "port-to-query", 80);
alias = configuration.getTuples().getStringProperty(i, "alias", "default");
username = configuration.getTuples().getStringProperty(i, "username", "admin");
password = configuration.getTuples().getStringProperty(i, "password", "password");
httpAuthentication = configuration.getTuples().getStringProperty(i, "http-authentication", "true");
relayNumber = configuration.getTuples().getIntProperty(i, "relay-number", 8);
autoConfiguration = configuration.getTuples().getStringProperty(i, "auto-configuration", "false");
objectClass = configuration.getTuples().getStringProperty(i, "object.class", "Light");
Board board = new Board(ipToQuery, portToQuery, alias, relayNumber, autoConfiguration, objectClass, username, password, httpAuthentication);
// add board object and its alias as key for the hashmap
devices.put(alias, board);
}
//setDescription(getDescription() + " " + ipToQuery + ":" + portToQuery + ";");
}
}
/**
* Connection to boards
*/
private boolean connect(String address, int port) {
LOG.info("Trying to connect to Devantech Eth-Rly board on address " + address + ':' + port);
try {
//TimedSocket is a non-blocking socket with timeout on exception
socket = TimedSocket.getSocket(address, port, SOCKET_TIMEOUT);
socket.setSoTimeout(SOCKET_TIMEOUT); //SOCKET_TIMEOUT ms of waiting on socket read/write
BufferedOutputStream buffOut = new BufferedOutputStream(socket.getOutputStream());
outputStream = new DataOutputStream(buffOut);
return true;
} catch (IOException e) {
LOG.severe("Unable to connect to host " + address + " on port " + port);
return false;
}
}
private void disconnect() {
// close streams and socket
try {
inputStream.close();
outputStream.close();
socket.close();
} catch (Exception ex) {
//do nothing. Best effort
}
}
/**
* Sensor side
*/
@Override
public void onStart() {
super.onStart();
POLLING_TIME = configuration.getIntProperty("polling-time", 1000);
BOARD_NUMBER = configuration.getTuples().size();
setPollingWait(POLLING_TIME);
loadBoards();
}
@Override
public void onStop() {
super.onStop();
//release resources
devices.clear();
devices = null;
setPollingWait(-1); //disable polling
//display the default description
setDescription(configuration.getStringProperty("description", "Devantech Eth-Rly"));
}
@Override
protected void onRun() {
// select all boards in the devices hashmap and evaluate the status
Set<String> keySet = devices.keySet();
for (String key : keySet) {
Board board = devices.get(key);
evaluateDiffs(getXMLStatusFile(board), board);
}
try {
Thread.sleep(POLLING_TIME);
} catch (InterruptedException ex) {
Logger.getLogger(DevantechEthRly.class.getName()).log(Level.SEVERE, null, ex);
}
}
private Document getXMLStatusFile(Board board) {
//get the xml file from the socket connection
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = null;
try {
dBuilder = dbFactory.newDocumentBuilder();
} catch (ParserConfigurationException ex) {
Logger.getLogger(DevantechEthRly.class.getName()).log(Level.SEVERE, null, ex);
}
Document doc = null;
URL url = null;
try {
String authString = board.getUsername() + ":" + board.getPassword();
byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
String authStringEnc = new String(authEncBytes);
//Create a URL for the desired page
url = new URL("http://" + board.getIpAddress() + ":"
+ Integer.toString(board.getPort()) + "/" + GET_STATUS_URL);
URLConnection urlConnection = url.openConnection();
// if required set the authentication
if (board.getHttpAuthentication().equalsIgnoreCase("true")) {
urlConnection.setRequestProperty("Authorization", "Basic " + authStringEnc);
}
LOG.info("Devantech Eth-Rly gets relay status from file " + url);
doc = dBuilder.parse(urlConnection.getInputStream());
doc.getDocumentElement().normalize();
} catch (ConnectException connEx) {
disconnect();
this.stop();
this.setDescription("Connection timed out, no reply from the board at " + url);
} catch (SAXException ex) {
disconnect();
this.stop();
LOG.severe(Freedomotic.getStackTraceInfo(ex));
} catch (Exception ex) {
disconnect();
this.stop();
setDescription("Unable to connect to " + url);
LOG.severe(Freedomotic.getStackTraceInfo(ex));
}
return doc;
}
private void evaluateDiffs(Document doc, Board board) {
//parses xml
if (doc != null && board != null) {
Node n = doc.getFirstChild();
NodeList nl = n.getChildNodes();
valueTag(doc, board, board.getRelayNumber(), "led", 0);
}
}
private void valueTag(Document doc, Board board, Integer nl, String tag, int startingRelay) {
for (int i = startingRelay; i < nl; i++) {
try {
String tagName = tag + i;
// control for storing value
if (!(board.getRelayStatus(i) == Integer.parseInt(doc.getElementsByTagName(tagName).item(0).getTextContent()))) {
sendChanges(i, board, doc.getElementsByTagName(tagName).item(0).getTextContent());
board.setRelayStatus(i, Integer.parseInt(doc.getElementsByTagName(tagName).item(0).getTextContent()));
//System.out.println("led" + i + " status " + Integer.parseInt(doc.getElementsByTagName(tagName).item(0).getTextContent()));
}
} catch (DOMException dOMException) {
//do nothing
} catch (NumberFormatException numberFormatException) {
//do nothing
} catch (NullPointerException ex) {
//do nothing
}
}
}
private void sendChanges(int relayLine, Board board, String status) {
relayLine++;
//reconstruct freedomotic object address
String address = board.getAlias() + ":" + relayLine;
LOG.info("Sending Devantech Eth-Rly protocol read event for object address '" + address + "'. It's readed status is " + status);
//building the event
ProtocolRead event = new ProtocolRead(this, "devantech-eth-rly", address); //ALIAS:RELAYLINE
if (status.equals("0")) {
event.addProperty("isOn", "false");
} else {
event.addProperty("isOn", "true");
}
//if autoconfiguration is true create an object if not already exists
if (board.getAutoConfiguration().equalsIgnoreCase("true")) {
event.addProperty("object.class", board.getObjectClass());
event.addProperty("object.name", address);
}
//adding some optional information to the event
event.addProperty("boardIP", board.getIpAddress());
event.addProperty("boardPort", new Integer(board.getPort()).toString());
event.addProperty("relayLine", new Integer(relayLine).toString());
//publish the event on the messaging bus
this.notifyEvent(event);
}
/**
* Actuator side
*/
@Override
public void onCommand(Command c) throws UnableToExecuteException {
//get connection paramentes address:port from received freedomotic command
String delimiter = configuration.getProperty("address-delimiter");
address = c.getProperty("address").split(delimiter);
Board board = (Board) devices.get(address[0]);
String ip_board = board.getIpAddress();
int port_board = board.getPort();
//connect to the ethernet board
boolean connected = false;
try {
connected = connect(ip_board, port_board);
} catch (ArrayIndexOutOfBoundsException outEx) {
LOG.severe("The object address '" + c.getProperty("address") + "' is not properly formatted. Check it!");
throw new UnableToExecuteException();
} catch (NumberFormatException numberFormatException) {
LOG.severe(port_board + " is not a valid ethernet port to connect to");
throw new UnableToExecuteException();
}
if (connected) {
String message = createMessage(c);
String expectedReply = c.getProperty("expected-reply");
try {
String reply = sendToBoard(message);
if ((reply != null) && (!reply.equals(expectedReply))) {
//TODO: implement reply check
}
} catch (IOException iOException) {
setDescription("Unable to send the message to host " + address[0] + " on port " + address[1]);
LOG.severe("Unable to send the message to host " + ip_board + " on port " + port_board);
System.err.println(iOException);
throw new UnableToExecuteException();
} finally {
disconnect();
}
} else {
throw new UnableToExecuteException();
}
}
private String sendToBoard(String message) throws IOException {
String receivedReply = null;
if (outputStream != null) {
outputStream.writeBytes(message);
outputStream.flush();
inputStream = new BufferedReader(new InputStreamReader(socket.getInputStream()));
try {
receivedReply = inputStream.readLine(); // read device reply
} catch (IOException iOException) {
throw new IOException();
}
}
return receivedReply;
}
// create message to send to the board
// this part must be changed to relect board protocol
public String createMessage(Command c) {
String message = null;
String page = null;
Integer relay = 0;
relay = Integer.parseInt(address[1]) - 1;
page = CHANGE_STATE_RELAY_URL + relay;
// http request sending to the board
message = "GET /" + page + " HTTP 1.1\r\n\r\n";
LOG.info("Sending 'GET /" + page + " HTTP 1.1' to relay board");
return (message);
}
@Override
protected boolean canExecute(Command c) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
protected void onEvent(EventTemplate event) {
throw new UnsupportedOperationException("Not supported yet.");
}
// retrieve a key from value in the hashmap
public static Object getKeyFromValue(Map hm, Object value) {
for (Object o : hm.keySet()) {
if (hm.get(o).equals(value)) {
return o;
}
}
return null;
}
}