/// <summary>
/// Write files to disk by downloading from NASA API.
/// </summary>
/// <param name="roverPhotos"></param>
private void WriteFilesToDisk(RoverPhotosResponse roverPhotos)
{
// Setup directory structure
CreateMissingDirectories(roverPhotos);
using (var client = new WebClient())
{
foreach (var roverPhoto in roverPhotos.photos)
{
var roverFileFolder = GetRoverPhotoFolderName(roverPhoto);
var downloadUrl = roverPhoto.img_src + "?api_key=" + apiKey;
var localFileName = System.IO.Path.GetFileName(roverPhoto.img_src);
var localFileFullPath = roverFileFolder + localFileName;
if (!File.Exists(localFileFullPath))
{
client.DownloadFile(downloadUrl, localFileFullPath);
roverPhoto.isDownloaded = true;
}
else
{
roverPhoto.isExists = true;
}
}
}
}
/// <summary>
/// Build directory stucture. This is done before image files are saved.
/// </summary>
/// <param name="roverPhotos"></param>
private void CreateMissingDirectories(RoverPhotosResponse roverPhotos)
{
foreach (var roverPhoto in roverPhotos.photos)
{
var roverFileFolder = GetRoverPhotoFolderName(roverPhoto);
if (!System.IO.Directory.Exists(roverFileFolder))
{
System.IO.Directory.CreateDirectory(roverFileFolder);
}
}
}
/// <summary>
/// Download metadata for a rover for a specified date.
/// </summary>
/// <param name="rover"></param>
/// <param name="formattedDate"></param>
/// <returns></returns>
private RoverPhotosResponse DownloadRoverDataForDate(string rover, string formattedDate)
{
var url = apiUrl + $"/mars-photos/api/v1/rovers/{rover}/photos?earth_date={formattedDate}&api_key={apiKey}";
var t = Task.Run(() => RestHelper.ProcessGetRequestAsync(url));
t.Wait();
RestResponse webResponse = t.Result;
RoverPhotosResponse roverPhotos = JsonConvert.DeserializeObject <RoverPhotosResponse>(webResponse.data);
return(roverPhotos);
}