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gaia/tv_apps/device-deck/js/bluetooth_manager.js

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+/* globals evt, BluetoothLoader */
+(function(exports) {
+  'use strict';
+
+  var BluetoothManager = function() {};
+
+  BluetoothManager.prototype = evt({
+    _mozBluetooth: undefined,
+
+    _defaultAdapter: undefined,
+
+    _discoveryHandle: undefined,
+
+    _handleDeviceFound: undefined,
+
+    _handleBeforeUnload: undefined,
+
+    _deviceDeck: undefined,
+
+    init: function bm_init() {
+      this._mozBluetooth = BluetoothLoader.getMozBluetooth();
+
+      this._handleDeviceFound = this.onDeviceFound.bind(this);
+
+      this._mozBluetooth.addEventListener('attributechanged',
+        this.onAttributeChanged.bind(this));
+
+      this._defaultAdapter = this._mozBluetooth.defaultAdapter;
+    },
+
+    onAttributeChanged: function bm_onAttributeChanged(evt) {
+      var that = this;
+      [].forEach.call(evt.attrs, function(attr, index) {
+        if (attr === 'defaultAdapter') {
+          that._defaultAdapter = that._mozBluetooth.defaultAdapter;
+          that.fire('default-adapter-ready');
+        }
+      });
+    },
+
+    _keepDiscoveryHandle: function bm_keepDiscoveryHandle(handle) {
+      this._discoveryHandle = handle;
+      this._discoveryHandle.addEventListener('devicefound',
+        this._handleDeviceFound);
+    },
+
+    _startDiscovery: function bm_startDiscovery() {
+      var that = this;
+      if (!this._defaultAdapter) {
+        return Promise.reject('default adapter doesn\'t exist');
+      }
+
+      if (this._defaultAdapter.state !== 'enabled') {
+        return this._defaultAdapter.enable().then(function() {
+          return that._defaultAdapter.startDiscovery();
+        }).then(this._keepDiscoveryHandle.bind(this));
+      }
+
+      return this._defaultAdapter.startDiscovery().then(
+        this._keepDiscoveryHandle.bind(this));
+    },
+
+    _stopDiscovery: function bm_stopDiscovery() {
+      if (!this._defaultAdapter) {
+        return Promise.reject('default adapter doesn\'t exist');
+      }
+
+      // force to stop anyway
+      return this._defaultAdapter.stopDiscovery();
+    },
+
+    safelyStartDiscovery: function bm_safelyStartDiscovery() {
+      var that = this;
+      if (!this._defaultAdapter) {
+        return new Promise(function(resolve, reject) {
+          that.on('default-adapter-ready', function() {
+            resolve(that._startDiscovery());
+          });
+        });
+      }
+      return this._startDiscovery();
+    },
+
+    safelyStopDiscovery: function bn_safelyStopDiscovery() {
+      return this._stopDiscovery().catch(function(reason) {
+        console.warn('failed to stop discovery: ' + reason);
+      });
+    },
+
+    onDeviceFound: function bm_onDeviceFound(evt) {
+      var device = evt.device;
+      this.fire('device-found', device);
+    }
+  });
+
+  exports.BluetoothManager = BluetoothManager;
+}(window));