/// <summary>
/// Call Mars Rover Photos API Request for the specified date
/// </summary>
/// <param name="photoDate"></param>
/// <returns></returns>
public async Task <HTTPResponseDetails> GetNASAPhotosAsync(string photoDate)
{
HTTPResponseDetails responseDetails = new HTTPResponseDetails();
string response;
Stream dataStream;
string method = "GET";
string endpoint = $"{_uri}?earth_date={photoDate}&api_key={_apiKey}"; //?earth_date=2020-12-11&api_key=DEMO_KEY
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint);
request.Method = method;
request.Date = DateTime.Now;
using (HttpWebResponse webResponse = (HttpWebResponse)await request.GetResponseAsync())
{
// Get content received after request
dataStream = webResponse.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
// Read to the end of the stream
response = reader.ReadToEnd();
// Save the response and the response code into the object returned by this method
responseDetails.ResponseResult = response;
responseDetails.ResponseStatus = webResponse.StatusCode;
}
}
catch (WebException ex)
{
if (ex?.Response != null)
{
using (WebResponse exResponse = ex.Response)
{
HttpWebResponse exWebResponse = (HttpWebResponse)exResponse;
using (Stream reader = exResponse.GetResponseStream())
{
string responseStream = new StreamReader(reader).ReadToEnd();
responseDetails.ResponseResult = responseStream;
}
responseDetails.ResponseStatus = exWebResponse.StatusCode;
}
}
else
{
responseDetails.ResponseResult = ex.ToString();
}
}
catch (Exception ex)
{
//Do some logging
}
return(responseDetails);
}
/// <summary>
/// Download NASA files for each date in Dates.txt
/// </summary>
/// <returns></returns>
public async Task DownLoadNASAPhotos()
{
try
{
// Create the required folder structure
_fileService.CreateRequiredFolders();
// Retrieve list of dates from Dates.txt
List <string> dateList = _fileService.ReadDatesFile();
// Process each date
foreach (string ds in dateList)
{
// Convert each date to format "yyyy-MM-dd" i.e. 2020-12-01
string dateString = ConvertDateString(ds);
// Check for date in the correct format
if (dateString != null)
{
// Call Mars Rover Photos API Request for the specified date
HTTPResponseDetails responseDetails = await _apiService.GetNASAPhotosAsync(dateString);
// If the response is ok, deserialize to NASA_ResponseObject model
if (responseDetails.ResponseStatus == System.Net.HttpStatusCode.OK)
{
// Deserialize the response
NASA_ResponseObject nasaResponseObject = JsonConvert.DeserializeObject <NASA_ResponseObject>(responseDetails.ResponseResult);
// Loop through the List<Photo>
foreach (Photo p in nasaResponseObject.photos)
{
// Get the file name part of the file name
string filename = Path.GetFileName(p.img_src);
// Save the photo to a local folder
await _fileService.SaveNASAPhoto(p.img_src, $"{_outputFilePath}{filename}");
}
}
else
{
// Do some logging
throw new Exception();
}
}
}
}
catch (Exception ex)
{
//Do Some logging, rethrow
throw;
}
}
