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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.energenie.internal.handler;
  14
  15 import java.io.ByteArrayInputStream;
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18 import java.nio.charset.StandardCharsets;
  19 import java.util.concurrent.ScheduledFuture;
  20 import java.util.concurrent.TimeUnit;
  21
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23 import org.eclipse.jdt.annotation.Nullable;
  24 import org.openhab.binding.energenie.internal.EnergeniePWMStateEnum;
  25 import org.openhab.binding.energenie.internal.config.EnergenieConfiguration;
  26 import org.openhab.core.io.net.http.HttpUtil;
  27 import org.openhab.core.thing.ChannelUID;
  28 import org.openhab.core.thing.Thing;
  29 import org.openhab.core.thing.ThingStatus;
  30 import org.openhab.core.thing.ThingStatusDetail;
  31 import org.openhab.core.thing.binding.BaseThingHandler;
  32 import org.openhab.core.types.Command;
  33 import org.openhab.core.types.RefreshType;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * The {@link EnergeniePWMHandler} is responsible for reading states and update PWM channels.
  39  *
  40  * @author Hans-Jörg Merk - Initial contribution
  41  */
  42
  43 @NonNullByDefault
  44 public class EnergeniePWMHandler extends BaseThingHandler {
  45
  46     private final Logger logger = LoggerFactory.getLogger(EnergeniePWMHandler.class);
  47
  48     private static final int HTTP_TIMEOUT_MILLISECONDS = 6000;
  49
  50     private String host = "";
  51     private String password = "";
  52     private int refreshInterval;
  53
  54     private @Nullable ScheduledFuture<?> refreshJob;
  55
  56     public EnergeniePWMHandler(Thing thing) {
  57         super(thing);
  58     }
  59
  60     @Override
  61     public void handleCommand(ChannelUID channelUID, Command command) {
  62         if (command instanceof RefreshType) {
  63             scheduler.execute(this::getState);
  64         }
  65     }
  66
  67     @Override
  68     public void initialize() {
  69         EnergenieConfiguration config = getConfigAs(EnergenieConfiguration.class);
  70
  71         if (!config.host.isEmpty() && !config.password.isEmpty()) {
  72             host = config.host;
  73             password = config.password;
  74             refreshInterval = EnergenieConfiguration.DEFAULT_REFRESH_INTERVAL;
  75             logger.debug("Initializing EnergeniePWMHandler for Host '{}'", host);
  76             updateStatus(ThingStatus.ONLINE);
  77             onUpdate();
  78         } else {
  79             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  80                     "Can not access device , IP-Address or password not set");
  81         }
  82     }
  83
  84     @Override
  85     public void dispose() {
  86         logger.debug("EnergeniePWMHandler disposed.");
  87         final ScheduledFuture<?> refreshJob = this.refreshJob;
  88
  89         if (refreshJob != null) {
  90             refreshJob.cancel(true);
  91             this.refreshJob = null;
  92         }
  93     }
  94
  95     public synchronized void getState() {
  96         String url = "http://" + host + "/login.html";
  97         String urlParameters = "pw=" + password;
  98         InputStream urlContent = new ByteArrayInputStream(urlParameters.getBytes(StandardCharsets.UTF_8));
  99         String loginResponseString = null;
 100
 101         try {
 102             logger.trace("sending 'POST' request to URL : {}", url);
 103             loginResponseString = HttpUtil.executeUrl("POST", url, urlContent, "TEXT/PLAIN", HTTP_TIMEOUT_MILLISECONDS);
 104
 105             if (loginResponseString != null) {
 106                 updateState("voltage", EnergeniePWMStateEnum.VOLTAGE.readState(loginResponseString));
 107                 updateState("current", EnergeniePWMStateEnum.CURRENT.readState(loginResponseString));
 108                 updateState("power", EnergeniePWMStateEnum.POWER.readState(loginResponseString));
 109                 updateState("energy", EnergeniePWMStateEnum.ENERGY.readState(loginResponseString));
 110                 try {
 111                     HttpUtil.executeUrl("POST", url, HTTP_TIMEOUT_MILLISECONDS);
 112                     logger.trace("logout from ip {}", host);
 113                 } catch (IOException e) {
 114                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 115                             "failed to logout: " + e.getMessage());
 116                 }
 117             }
 118
 119         } catch (IOException e) {
 120             logger.debug("energenie: failed to login to {} with ip {}", thing.getUID(), host, e);
 121             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 122         }
 123     }
 124
 125     private synchronized void onUpdate() {
 126         ScheduledFuture<?> refreshJob = this.refreshJob;
 127         if (refreshJob == null || refreshJob.isCancelled()) {
 128             this.refreshJob = scheduler.scheduleWithFixedDelay(this::getState, 5, refreshInterval, TimeUnit.SECONDS);
 129         }
 130     }
 131 }