sharee.bike-App/LockItBLE/Services/BluetoothLock/BLE/LockItServiceBase.cs

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2021-05-13 17:25:46 +02:00
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Linq;
using TINK.Services.BluetoothLock.Tdo;
using TINK.Model.Connector;
using System;
using Serilog;
using TINK.Model.Device;
using Xamarin.Essentials;
using TINK.Model.Bike.BluetoothLock;
namespace TINK.Services.BluetoothLock.BLE
{
public abstract class LockItServiceBase
{
/// <summary>Constructs base object.</summary>
/// <param name="cipher">Encrpyting/ decrypting object.</param> /// <param name="connectTimeout">Timeout to apply when connecting to bluetooth lock.</param>
public LockItServiceBase(ICipher cipher)
{
Cipher = cipher;
}
/// <summary> Holds timeout values for series of connecting attemps to a lock or multiple locks. </summary>
public ITimeOutProvider TimeOut { get; set; }
protected ICipher Cipher { get; }
/// <summary> List of available or connected bluetooth devices. </summary>
protected List<ILockService> DeviceList = new List<ILockService>();
/// <summary> Reconnect locks of interest if required. </summary>
/// <remarks> Consists of a bluetooth connect plus invocation of an authentication sequence for each lock to be reconnected. </remarks>
/// <param name="locksInfo">Locks to reconnect.</param>
/// <param name="connectTimeout">Timeout for connect operation.</param>
public static async Task CheckReconnect(
IEnumerable<ILockService> deviceList,
IEnumerable<LockInfoAuthTdo> locksInfo,
TimeSpan connectTimeout)
{
// Get list of target locks without invalid entries.
var validLocksInfo = locksInfo
.Where(x => x.IsIdValid || x.IsGuidValid)
.Where(x => x.K_seed.Length > 0 && x.K_u.Length > 0)
.ToList();
foreach (var device in deviceList)
{
if (device.GetDeviceState() == DeviceState.Connected)
{
// No need to reconnect device because device is already connected.
continue;
}
var lockInfo = validLocksInfo.FirstOrDefault(x => x.Id == device. Name.GetBluetoothLockId() || x.Guid == device.Guid);
if (lockInfo == null)
{
// Current lock from deviceList is not of interest detected, no need to reconnect.
continue;
}
try
{
await device.ReconnectAsync(lockInfo, connectTimeout);
}
catch (System.Exception exception)
{
// Member is called for background update of missing devices.
// Do not display any error messages.
Log.ForContext<LockItServiceBase>().Error($"Reconnect failed. {exception.Message}");
continue;
}
}
}
/// <summary> Gets the state for locks of interest.</summary>
/// <remarks>
/// Might require a
/// - connect to lock
/// - reconnect to lock
/// </remarks>
/// <param name="locksInfo">Locks toget info for.</param>
/// <param name="connectTimeout">Timeout for connect operation of a single lock.</param>
public async Task<IEnumerable<LockInfoTdo>> GetLocksStateAsync(
IEnumerable<LockInfoAuthTdo> locksInfo,
TimeSpan connectTimeout)
{
if (locksInfo.Count() == 0)
{
// Nothing to do.
return new List<LockInfoTdo>();
}
// Reconnect locks.
await CheckReconnect(DeviceList, locksInfo, connectTimeout);
// Connect to locks which were not yet discovered.
DeviceList.AddRange(await CheckConnectMissing(locksInfo, connectTimeout));
// Get devices for which to update state.
var locksInfoState = new List<LockInfoTdo>();
foreach (var device in DeviceList)
{
var lockInfoAuth = locksInfo.FirstOrDefault(x => x.Guid == device.Guid || x.Id == device.Id);
if (lockInfoAuth == null)
{
// Device is not of interest.
continue;
}
var state = await device.GetLockStateAsync();
locksInfoState.Add(new LockInfoTdo.Builder
{
Id = lockInfoAuth.Id,
Guid = lockInfoAuth.IsGuidValid ? lockInfoAuth.Guid : device.Guid,
State = state?.State
}.Build());
}
return locksInfoState;
}
/// <remarks> Consists of a bluetooth connect plus invocation of an authentication sequence. </remarks>
/// <param name="locksInfo">Locks to reconnect.</param>
/// <param name="connectTimeout">Timeout for connect operation of a single lock.</param>
protected abstract Task<IEnumerable<ILockService>> CheckConnectMissing(
IEnumerable<LockInfoAuthTdo> locksInfo,
TimeSpan connectTimeout);
/// <summary>Gets a lock by bike Id.</summary>
/// <param name="bikeId"></param>
/// <returns>Lock object</returns>
public ILockService this[int bikeId]
{
get
{
var device = DeviceList.FirstOrDefault(x => x.Name.GetBluetoothLockId() == bikeId);
if (device == null)
{
return new NullLock(bikeId);
}
return device;
}
}
/// <summary> Connects to lock.</summary>
/// <remarks> Consists of a bluetooth connect plus invocation of an authentication sequence. </remarks>
/// <param name="authInfo"> Info required to connect to lock.</param>
/// <param name="connectTimeout">Timeout for connect operation.</param>
public async Task<LockingState> DisconnectAsync(int bikeId, Guid bikeGuid)
{
if (DeviceInfo.Platform != DevicePlatform.Unknown && MainThread.IsMainThread == false)
{
throw new System.Exception("Can not disconnect from lock. Bluetooth code must be run on main thread");
}
Log.ForContext<LockItByScanServiceBase>().Debug($"Request to disconnect from device {bikeId}/ {bikeGuid}.");
var lockIt = DeviceList.FirstOrDefault(x => x.Name.GetBluetoothLockId() == bikeId || x.Guid == bikeGuid);
if (lockIt == null)
{
// Nothing to do
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return LockingState.UnknownDisconnected;
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}
DeviceList.Remove(lockIt);
if (lockIt.GetDeviceState() == DeviceState.Disconnected)
{
// Nothing to do
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return LockingState.UnknownDisconnected;
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}
await lockIt.Disconnect();
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return LockingState.UnknownDisconnected;
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}
}
}