304 lines
9.7 KiB
Dart
304 lines
9.7 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:math';
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import 'package:flutter_broadcast_receiver/flutter_broadcast_receiver.dart';
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import 'package:mqtt_client/mqtt_client.dart';
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import 'package:mqtt_client/mqtt_server_client.dart';
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import 'package:stadtbote/model/bootstrap_request.dart';
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import 'package:stadtbote/model/bootstrap_response_payload.dart';
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import 'package:stadtbote/model/device_object.dart';
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import 'package:stadtbote/model/job.dart';
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import 'package:stadtbote/model/message.dart';
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import 'package:stadtbote/model/start_session_message.dart';
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import 'package:stadtbote/tools/connection_status.dart';
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import 'package:stadtbote/tools/messages/job_received_message.dart';
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import 'package:stadtbote/tools/messages/message_message.dart';
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import 'package:stadtbote/tools/messages/session_info_update.dart';
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import 'package:typed_data/typed_buffers.dart';
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import 'package:http/http.dart' as http;
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import 'package:uuid/uuid.dart';
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import '../main.dart';
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import '../model/status.dart';
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import 'constants.dart';
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import 'util.dart';
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class MqttCore {
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static late MqttCore instance;
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late String _brokerUri;
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late int _brokerPort;
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late String _fromServerTopic;
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late String _toServerTopic;
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late MqttServerClient _mqttClient;
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late int _reconnectDelay = 0;
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MqttCore() {
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_processBootstrap();
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}
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static setup() {
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instance = MqttCore();
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}
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_connectToBroker() async {
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try {
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String clientId = await Util.getAppUuid();
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Util.logInfo("client id: $clientId");
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Util.logInfo("broker uri: $_brokerUri");
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Util.logInfo("broker port: $_brokerPort");
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_mqttClient = MqttServerClient.withPort(_brokerUri, clientId, _brokerPort);
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_mqttClient.logging(on: false);
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_mqttClient.keepAlivePeriod = 20;
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_mqttClient.autoReconnect = false;
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_mqttClient.onDisconnected = _clientDisconnected;
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_mqttClient.connectionMessage = MqttConnectMessage()
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.withClientIdentifier('clientId')
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.withWillQos(MqttQos.atMostOnce)
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//.withWillTopic('willTopic')
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//.withWillMessage('willMessage')
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.authenticateAs("app", "apppwd");
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await _mqttClient.connect();
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if (_mqttClient.connectionStatus?.state == MqttConnectionState.connected) {
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Util.logInfo('Verbunden mit dem MQTT-Broker!');
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_reconnectDelay = 0;
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_setupSubscriptions();
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_initSession();
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} else {
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Util.logInfo('Verbindung zum MQTT-Broker fehlgeschlagen!');
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BroadcastReceiver().publish<ConnectionStatus>(Constants.messageTopicConnectionStatusChanged, arguments: ConnectionStatus(status: ConnectionStatusEnum.notConnected));
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_startReconnectTimer();
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}
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} catch (ex) {
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_startReconnectTimer();
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Util.logInfo('Verbindung zum MQTT-Broker fehlgeschlagen!: $ex');
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BroadcastReceiver().publish<ConnectionStatus>(Constants.messageTopicConnectionStatusChanged, arguments: ConnectionStatus(status: ConnectionStatusEnum.notConnected));
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}
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}
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publishText(String topic, String text) {
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try {
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var buffer = Uint8Buffer();
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buffer.addAll(text.codeUnits);
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_mqttClient.publishMessage(topic, MqttQos.exactlyOnce, buffer);
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} catch (e) {
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Util.logException(e.toString());
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}
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}
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void _setupSubscriptions() async {
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Util.logInfo('_setupSubscriptions called');
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_mqttClient.updates?.listen((List<MqttReceivedMessage<MqttMessage>> c) {
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try {
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final MqttPublishMessage message = c[0].payload as MqttPublishMessage;
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final payload = MqttPublishPayload.bytesToStringAsString(message.payload.message);
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var topic = message.variableHeader?.topicName;
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Util.logInfo('message received');
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Util.logInfo('topic: $topic');
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Util.logInfo('payload: $payload');
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Map<String, dynamic> messageData = jsonDecode(payload);
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for (var entry in messageData.keys) {
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if (entry == 'payload') {
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var payload = messageData[entry];
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for (var payloadEntry in payload.keys) {
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var payloadData = payload[payloadEntry];
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switch(payloadEntry) {
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case 'session':
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_sessionMessageReceived(payloadData);
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break;
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case 'jobs':
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_jobMessageReceived(payloadData);
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break;
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case "mssg":
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_messageMessageReceived(payloadData);
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break;
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default:
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Util.logInfo('Unknown topic: $payloadEntry');
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break;
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}
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}
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}
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}
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} catch(ex) {
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Util.logException(ex.toString());
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}
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});
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_mqttClient.subscribe(_fromServerTopic, MqttQos.exactlyOnce);
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Util.logInfo('subscribed to topic: $_fromServerTopic');
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BroadcastReceiver().publish<ConnectionStatus>(Constants.messageTopicConnectionStatusChanged, arguments: ConnectionStatus(status: ConnectionStatusEnum.connected));
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}
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void _sessionMessageReceived(payloadData) async {
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var statusMessage = Status.fromJson(payloadData['status']);
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await MyApp.isarInstance.writeTxn(() async {
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await MyApp.isarInstance.status.put(statusMessage);
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});
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BroadcastReceiver().publish<StatusInfoUpdate>(Constants.messageTopicStatusInfoUpdate, arguments: StatusInfoUpdate(status: statusMessage));
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}
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void _jobMessageReceived(payloadData) async {
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for (var foundJobData in payloadData) {
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Job newJob = Job.fromJson(foundJobData);
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await MyApp.isarInstance.writeTxn(() async {
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await MyApp.isarInstance.jobs.put(newJob);
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});
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BroadcastReceiver().publish<JobReceivedMessage>(Constants.messageTopicJobReceived, arguments: JobReceivedMessage(job: newJob));
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}
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}
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void _messageMessageReceived(Map<String, dynamic> payloadData) async {
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var newMessage = Message.fromJson(payloadData);
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await MyApp.isarInstance.writeTxn(() async {
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await MyApp.isarInstance.messages.put(newMessage);
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});
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BroadcastReceiver().publish<MessageReceivedMessage>(Constants.messageTopicMessageReceived, arguments: MessageReceivedMessage(message: newMessage));
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}
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void _startReconnectTimer() {
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Util.logInfo("_startReconnectTimer called");
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_reconnectDelay = min(_reconnectDelay + 1, 30);
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Timer(Duration(seconds: _reconnectDelay), () {
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_processBootstrap();
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});
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}
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void _clientDisconnected() {
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Util.logInfo("_clientDisconnected called");
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BroadcastReceiver().publish<ConnectionStatus>(Constants.messageTopicConnectionStatusChanged, arguments: ConnectionStatus(status: ConnectionStatusEnum.notConnected));
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_startReconnectTimer();
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}
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void _processBootstrap() async {
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try {
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var deviceObject = DeviceObject();
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deviceObject.manufacturer = "sven";
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deviceObject.model = "emulator";
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deviceObject.os = "hat es";
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deviceObject.osVer = "0.0";
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var handshakeMessage = BootstrapRequest();
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handshakeMessage.app = "sb";
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handshakeMessage.mqttClientId = "12345";
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handshakeMessage.deviceObject = deviceObject;
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handshakeMessage.ver = 200;
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var jsonMap = handshakeMessage.toJson();
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var json = jsonEncode(jsonMap);
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var uri = "https://init-x.assecutor.de/bootstrap?get_mqtt_broker=$json";
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Util.logInfo("Bootstrap request: $uri");
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var response = await http.get(Uri.parse(uri));
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var responseText = response.body;
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var bootstrapResponsePayload = BootstrapResponsePayload.fromJson(jsonDecode(responseText)["payload"]);
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var brokerUriAndPortArray = bootstrapResponsePayload.config.broker.replaceFirst("mqtt://", "").split(":");
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_brokerUri = brokerUriAndPortArray[0];
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_brokerPort = int.parse(brokerUriAndPortArray[1]);
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_fromServerTopic = bootstrapResponsePayload.config.topics.fromServer;
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_toServerTopic = bootstrapResponsePayload.config.topics.toServer;
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_connectToBroker();
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} catch (ex) {
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_startReconnectTimer();
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}
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}
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_initSession() {
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var playload = Payload();
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playload.startSession = "true";
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var startSessionMessage = StartSessionMessage();
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startSessionMessage.recv = "server";
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startSessionMessage.store = true;
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startSessionMessage.messageId = const Uuid().v4();
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startSessionMessage.payload = playload;
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var jsonMap = startSessionMessage.toJson();
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var json = jsonEncode(jsonMap);
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Util.logInfo("json: $json");
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final builder = MqttClientPayloadBuilder();
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builder.addString(json);
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var payload = builder.payload;
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var topic = "$_toServerTopic/init";
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Util.logInfo("topic: $topic");
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var messageId = _mqttClient.publishMessage(topic, MqttQos.exactlyOnce, payload!);
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Util.logInfo("messageId: $messageId");
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}
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/*
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private async void StartSession()
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{
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App.Logger.Debug("StartSession called");
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App.Logger.Debug("Setting state to start session");
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_mqttState = MqttStateEnum.StartSession;
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var startSession = new JObject
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{
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new JProperty("recv", "server"),
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new JProperty("store", true),
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new JProperty("id", Guid.NewGuid().ToString()),
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new JProperty("payload", new JObject(
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new JProperty("start_session", "true")))
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};
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var json = JsonConvert.SerializeObject(startSession);
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var topic = _toServerTopic + "/init";
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var message = new MqttApplicationMessage()
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{
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Topic = topic,
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Payload = Encoding.UTF8.GetBytes(json),
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QualityOfServiceLevel = MqttQualityOfServiceLevel.ExactlyOnce,
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Retain = true,
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MessageExpiryInterval = 3600,
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};
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await _mqttClient.PublishAsync(message);
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App.Logger.Debug("StartSession message " + json + " published to " + topic);
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SendEnqueuedMessages();
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}
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*/
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}
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