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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Javascript for device_broker, served from chrome://bluetooth-internals/.
* Provides a single source to access DeviceRemotes. DeviceRemotes are cached
* for repeated use. Multiple connection requests will result in the same
* DeviceRemote being shared among all requesters.
*/
import {getAdapterBroker} from './adapter_broker.js';
import {DeviceRemote} from './device.mojom-webui.js';
// Expose for testing.
/**
* @type {Map<string,
* !DeviceRemote|!Promise<!DeviceRemote>>}
*/
export const connectedDevices = new Map();
/**
* Creates a GATT connection to the device with |address|. If a connection to
* the device already exists, the promise is resolved with the existing
* DeviceRemote. If a connection is in progress, the promise resolves when
* the existing connection request promise is fulfilled.
* @param {string} address
* @return {!Promise<!DeviceRemote>}
*/
export function connectToDevice(address) {
const deviceOrPromise = connectedDevices.get(address) || null;
if (deviceOrPromise !== null) {
return Promise.resolve(deviceOrPromise);
}
const promise = /** @type {!Promise<!DeviceRemote>} */ (
getAdapterBroker()
.then(function(adapterBroker) {
return adapterBroker.connectToDevice(address);
})
.then(function(device) {
connectedDevices.set(address, device);
device.onConnectionError.addListener(
() => connectedDevices.delete(address));
return device;
})
.catch(function(error) {
connectedDevices.delete(address);
throw error;
}));
connectedDevices.set(address, promise);
return promise;
}
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