/// <summary>
/// Override method of IHostedService execute async
/// </summary>
/// <param name="stoppingToken"></param>
/// <returns></returns>
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
var webRoot = _environment.WebRootPath;
var imagesFolder = _fileSystem.Path.Combine(webRoot, Constants.ImageDirectory);
while (!stoppingToken.IsCancellationRequested)
{
try
{
if (!_fileSystem.File.Exists(_dateConfigFile))
{
_logger.LogWarning("File does not exists.", new[] { _dateConfigFile });
continue;
}
var dates = _fileSystem.File.ReadAllLines(_dateConfigFile);
foreach (var date in dates)
{
var validDate = DateTime.Today;
var isValidDate = DateTime.TryParse(date, out validDate);
if (!isValidDate)
{
_logger.LogWarning("Invalid date found in the text file", new[] { date });
continue;
}
var earth_date = validDate.ToString("yyyy-MM-dd");
var albumFolder = $"{imagesFolder}/{earth_date}";
if (_fileSystem.Directory.Exists(albumFolder))
{
_logger.LogInformation($"Images for {earth_date} are already downloaded");
continue;
}
_fileSystem.Directory.CreateDirectory(albumFolder);
var images = await _roverService.GetImages(validDate).ConfigureAwait(false);
foreach (var image in images)
{
var imageStream = await _roverService.DownloadImage(image.URL).ConfigureAwait(false);
var filename = $"{albumFolder}/{image.Caption}.jpg";
using (var stream = _fileSystem.FileStream.Create(filename, FileMode.Create))
{
imageStream.CopyTo(stream);
}
}
}
}
catch (Exception e)
{
_logger.LogError(e.Message);
}
await Task.Delay(TimeSpan.FromMinutes(_noOfMinutesToWait), stoppingToken).ConfigureAwait(false);
}
}