/**
* Copyright © 2016-2017 The Thingsboard Authors
*
* 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.thingsboard.server.extensions.core.plugin.messaging;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.thingsboard.server.common.data.Device;
import org.thingsboard.server.common.data.id.CustomerId;
import org.thingsboard.server.common.data.id.DeviceId;
import org.thingsboard.server.common.data.id.RuleId;
import org.thingsboard.server.common.data.id.TenantId;
import org.thingsboard.server.common.msg.core.ToServerRpcRequestMsg;
import org.thingsboard.server.common.msg.core.ToServerRpcResponseMsg;
import org.thingsboard.server.extensions.api.plugins.PluginCallback;
import org.thingsboard.server.extensions.api.plugins.PluginContext;
import org.thingsboard.server.extensions.api.plugins.handlers.RuleMsgHandler;
import org.thingsboard.server.extensions.api.plugins.msg.*;
import org.thingsboard.server.extensions.api.rules.RuleException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
/**
* @author Andrew Shvayka
*/
@Slf4j
public class DeviceMessagingRuleMsgHandler implements RuleMsgHandler {
private static final Gson GSON = new Gson();
private static final String GET_DEVICE_LIST_METHOD_NAME = "getDevices";
private static final String SEND_MSG_METHOD_NAME = "sendMsg";
private static final String ON_MSG_METHOD_NAME = "onMsg";
private static final String ONEWAY = "oneway";
private static final String TIMEOUT = "timeout";
private static final String DEVICE_ID = "deviceId";
private Map<UUID, PendingRpcRequestMetadata> pendingMsgs = new HashMap<>();
@Setter
private DeviceMessagingPluginConfiguration configuration;
@Override
public void process(PluginContext ctx, TenantId tenantId, RuleId ruleId, RuleToPluginMsg<?> msg) throws RuleException {
if (msg.getPayload() instanceof ToServerRpcRequestMsg) {
ToServerRpcRequestMsg request = (ToServerRpcRequestMsg) msg.getPayload();
try {
PendingRpcRequestMetadata md = new PendingRpcRequestMetadata(msg.getUid(),
request.getRequestId(), tenantId, ruleId, msg.getCustomerId(), msg.getDeviceId());
switch (request.getMethod()) {
case GET_DEVICE_LIST_METHOD_NAME:
processGetDeviceList(ctx, md);
case SEND_MSG_METHOD_NAME:
processSendMsg(ctx, md, request);
break;
default:
throw new RuleException("Method " + request.getMethod() + " not supported!");
}
} catch (RuleException e) {
throw e;
} catch (Exception e) {
throw new RuleException(e.getMessage(), e);
}
}
}
public void process(PluginContext ctx, FromDeviceRpcResponse msg) {
UUID requestId = msg.getId();
PendingRpcRequestMetadata pendindMsg = pendingMsgs.remove(requestId);
if (pendindMsg != null) {
log.trace("[{}] Received response: {}", requestId, msg);
ToServerRpcResponseMsg response;
if (msg.getError().isPresent()) {
response = new ToServerRpcResponseMsg(pendindMsg.getRequestId(), toJsonString(msg.getError().get()));
} else {
response = new ToServerRpcResponseMsg(pendindMsg.getRequestId(), msg.getResponse().orElse(""));
}
ctx.reply(new RpcResponsePluginToRuleMsg(
pendindMsg.getUid(), pendindMsg.getTenantId(), pendindMsg.getRuleId(), response));
} else {
log.trace("[{}] Received stale response: {}", requestId, msg);
}
}
private void processGetDeviceList(PluginContext ctx, PendingRpcRequestMetadata requestMd) {
CustomerId customerId = requestMd.getCustomerId();
if (!customerId.isNullUid()) {
ctx.getCustomerDevices(requestMd.getTenantId(), customerId, configuration.getMaxDeviceCountPerCustomer(), new PluginCallback<List<Device>>() {
@Override
public void onSuccess(PluginContext ctx, List<Device> devices) {
JsonArray deviceList = new JsonArray();
devices.stream().filter(device -> !requestMd.getDeviceId().equals(device.getId())).forEach(device -> {
JsonObject deviceJson = new JsonObject();
deviceJson.addProperty("id", device.getId().toString());
deviceJson.addProperty("name", device.getName());
deviceList.add(deviceJson);
});
ToServerRpcResponseMsg response = new ToServerRpcResponseMsg(requestMd.getRequestId(), GSON.toJson(deviceList));
ctx.reply(new RpcResponsePluginToRuleMsg(
requestMd.getUid(), requestMd.getTenantId(), requestMd.getRuleId(), response));
}
@Override
public void onFailure(PluginContext ctx, Exception e) {
replyWithError(ctx, requestMd, RpcError.INTERNAL);
}
});
} else {
replyWithError(ctx, requestMd, "Device is unassigned!");
}
}
private void processSendMsg(PluginContext ctx, PendingRpcRequestMetadata requestMd, ToServerRpcRequestMsg request) {
JsonObject params = new JsonParser().parse(request.getParams()).getAsJsonObject();
String targetDeviceIdStr = params.get(DEVICE_ID).getAsString();
DeviceId targetDeviceId = DeviceId.fromString(targetDeviceIdStr);
boolean oneWay = isOneWay(params);
long timeout = getTimeout(params);
if (timeout <= 0) {
replyWithError(ctx, requestMd, "Timeout can't be negative!");
} else if (timeout > configuration.getMaxTimeout()) {
replyWithError(ctx, requestMd, "Timeout is too large!");
} else {
ctx.getDevice(targetDeviceId, new PluginCallback<Device>() {
@Override
public void onSuccess(PluginContext ctx, Device targetDevice) {
UUID uid = UUID.randomUUID();
if (targetDevice == null) {
replyWithError(ctx, requestMd, RpcError.NOT_FOUND);
} else if (!requestMd.getCustomerId().isNullUid() &&
requestMd.getTenantId().equals(targetDevice.getTenantId())
&& requestMd.getCustomerId().equals(targetDevice.getCustomerId())) {
pendingMsgs.put(uid, requestMd);
log.trace("[{}] Forwarding {} to [{}]", uid, params, targetDeviceId);
ToDeviceRpcRequestBody requestBody = new ToDeviceRpcRequestBody(ON_MSG_METHOD_NAME, GSON.toJson(params.get("body")));
ctx.sendRpcRequest(new ToDeviceRpcRequest(uid, targetDevice.getTenantId(), targetDeviceId, oneWay, System.currentTimeMillis() + timeout, requestBody));
} else {
replyWithError(ctx, requestMd, RpcError.FORBIDDEN);
}
}
@Override
public void onFailure(PluginContext ctx, Exception e) {
replyWithError(ctx, requestMd, RpcError.INTERNAL);
}
});
}
}
private boolean isOneWay(JsonObject params) {
boolean oneWay = false;
if (params.has(ONEWAY)) {
oneWay = params.get(ONEWAY).getAsBoolean();
}
return oneWay;
}
private long getTimeout(JsonObject params) {
long timeout;
if (params.has(TIMEOUT)) {
timeout = params.get(TIMEOUT).getAsLong();
} else {
timeout = configuration.getDefaultTimeout();
}
return timeout;
}
private void replyWithError(PluginContext ctx, PendingRpcRequestMetadata requestMd, RpcError error) {
replyWithErrorJson(ctx, requestMd, toJsonString(error));
}
private void replyWithError(PluginContext ctx, PendingRpcRequestMetadata requestMd, String error) {
replyWithErrorJson(ctx, requestMd, toJsonString(error));
}
private void replyWithErrorJson(PluginContext ctx, PendingRpcRequestMetadata requestMd, String error) {
ToServerRpcResponseMsg response = new ToServerRpcResponseMsg(requestMd.getRequestId(), error);
ctx.reply(new RpcResponsePluginToRuleMsg(
requestMd.getUid(), requestMd.getTenantId(), requestMd.getRuleId(), response));
}
private String toJsonString(String error) {
JsonObject errorObj = new JsonObject();
errorObj.addProperty("error", error);
return GSON.toJson(errorObj);
}
private String toJsonString(RpcError error) {
JsonObject errorObj = new JsonObject();
switch (error) {
case NOT_FOUND:
errorObj.addProperty("error", "Target device not found!");
break;
case NO_ACTIVE_CONNECTION:
errorObj.addProperty("error", "No active connection to remote device!");
break;
case TIMEOUT:
errorObj.addProperty("error", "Timeout while waiting response from device!");
break;
case FORBIDDEN:
errorObj.addProperty("error", "This action is not allowed! Devices are unassigned or assigned to different customers!");
break;
case INTERNAL:
errorObj.addProperty("error", "Internal server error!");
break;
}
return GSON.toJson(errorObj);
}
}