/// <summary>
/// Retrieves current live track points
/// </summary>
/// <param name="trackName">track name to use</param>
/// <param name="appResourceUri">app resource uri to use</param>
/// <returns>loaded live track</returns>
private static async Task <Track> GetLiveTrack(string trackName, AppResourceUri appResourceUri)
{
var dataService = DependencyService.Get <IDataService>();
LiveTrackQueryResult result = await dataService.GetLiveTrackDataAsync(
appResourceUri.ToString(),
null);
var track = new Track
{
Id = result.Data.ID,
Name = trackName ?? result.Data.Name,
Description = HtmlConverter.Sanitize(result.Data.Description),
IsFlightTrack = true,
IsLiveTrack = true,
Color = "ff8000",
TrackPoints = result.Data.TrackPoints.Select(
trackPoint => new TrackPoint(
latitude: trackPoint.Latitude,
longitude: trackPoint.Longitude,
altitude: trackPoint.Altitude,
null)
{
Time = result.Data.TrackStart.AddSeconds(trackPoint.Offset),
}).ToList()
};
track.CalculateStatistics();
return(track);
}
/// <summary>
/// Retrieves latest info about a live track, including new list of track points and
/// description.
/// </summary>
/// <param name="liveTrackId">live track ID</param>
/// <param name="lastTrackPointTime">
/// last track point that the client already has received, or null when no track points
/// are known yet
/// </param>
/// <returns>query result for live track</returns>
public async Task <LiveTrackQueryResult> GetLiveTrackDataAsync(
string liveTrackId,
DateTimeOffset?lastTrackPointTime)
{
LiveTrackQueryResult result = await this.backendWebApi.GetLiveTrackDataAsync(
liveTrackId,
lastTrackPointTime);
result.Data.ID = System.Net.WebUtility.UrlDecode(result.Data.ID);
return(result);
}
/// <summary>
/// Called when page requests an update for a live track
/// </summary>
/// <param name="data">update live track data</param>
/// <returns>
/// JSON result of query, either a LiveTrackQueryResult or an exception text
/// </returns>
public async Task <JsonResult> OnGetUpdateLiveTrackAsync(UpdateLiveTrackData data)
{
string liveTrackId = data.Uri;
DateTimeOffset?lastTrackPointTime = data.LastTrackPointTime;
try
{
LiveTrackQueryResult queryResult =
await this.backendWebApi.GetLiveTrackDataAsync(
liveTrackId,
lastTrackPointTime);
return(new JsonResult(queryResult));
}
catch (Exception ex)
{
return(new JsonResult(ex.Message));
}
}
