public async Task <HttpGetIksSuccessResult> ExecuteAsync(DateTime date, string batchTag)
{
_logger.WriteRequestingData(date, batchTag);
var uri = new Uri($"{_efgsConfig.BaseUrl}/diagnosiskeys/download/{date:yyyy-MM-dd}");
try
{
// Configure authentication certificate
using var clientCert = _certificateProvider.GetCertificate();
using var clientHandler = new HttpClientHandler
{
ClientCertificateOptions = ClientCertificateOption.Manual
};
// Provide the authentication certificate manually
clientHandler.ClientCertificates.Clear();
clientHandler.ClientCertificates.Add(clientCert);
// Build the request
var request = new HttpRequestMessage {
RequestUri = uri
};
request.Headers.Add("Accept", ApplicationProtobuf);
if (!string.IsNullOrWhiteSpace(batchTag))
{
request.Headers.Add("batchTag", batchTag);
}
if (_efgsConfig.SendClientAuthenticationHeaders)
{
request.Headers.Add("X-SSL-Client-SHA256", clientCert.ComputeSha256Hash());
request.Headers.Add("X-SSL-Client-DN", clientCert.Subject.Replace(" ", string.Empty));
}
using var client = new HttpClient(clientHandler);
_logger.WriteRequest(request);
var response = await client.SendAsync(request);
_logger.WriteResponse(response.StatusCode);
_logger.WriteResponseHeaders(response.Headers);
// Handle response
switch (response.StatusCode)
{
case HttpStatusCode.OK:
// EFGS returns the string 'null' if there is no batch tag. We will represent this with an actual null.
var nextBatchTag = response.Headers.SafeGetValue("nextBatchTag");
nextBatchTag = nextBatchTag == "null" ? null : nextBatchTag;
return(new HttpGetIksSuccessResult
{
//TODO errors if info not present
BatchTag = response.Headers.SafeGetValue("batchTag"),
NextBatchTag = nextBatchTag,
Content = await response.Content.ReadAsByteArrayAsync()
});
case HttpStatusCode.NotFound:
_logger.WriteResponseNotFound();
return(null);
case HttpStatusCode.Gone:
_logger.WriteResponseGone();
return(null);
case HttpStatusCode.BadRequest:
_logger.WriteResponseBadRequest();
throw new EfgsCommunicationException();
case HttpStatusCode.Forbidden:
_logger.WriteResponseForbidden();
throw new EfgsCommunicationException();
case HttpStatusCode.NotAcceptable:
_logger.WriteResponseNotAcceptable();
throw new EfgsCommunicationException();
default:
_logger.WriteResponseUndefined(response.StatusCode);
throw new EfgsCommunicationException();
}
}
catch (Exception e)
{
_logger.WriteEfgsError(e);
throw;
}
}
public async Task ExecuteAsync()
{
var jobInfo = GetJobInfo();
var downloadCount = 0;
var lastWrittenBatchTag = jobInfo.LastBatchTag;
// Set date to a default of today.
// Either we continue where we left off, or we grab as many batches as allowed
// (i.e., a few days worth back from today)
var date = _dateTimeProvider.Snapshot.Date;
var batchTagDatePart = lastWrittenBatchTag.Split("-").FirstOrDefault();
if (!string.IsNullOrEmpty(batchTagDatePart))
{
// All is good, start requesting batch from where we left off.
// The date and the batchTag's creation date need to be the same,
// otherwise EFGS will return a HTTP status 404.
date = DateTime.ParseExact(batchTagDatePart, "yyyyMMdd", null);
}
else
{
// If lastWrittenBatchTag is somehow unusable or unavailable,
// go as far back as allowed and don't send a batchTag to EFGS.
date = date.AddDays(_efgsConfig.DaysToDownload * -1);
lastWrittenBatchTag = string.Empty;
}
// If we have a batchTag, we will re-request that batch from EFGS to start our run.
// If we do not have a batchTag (it is null or empty), the first batch of the date requested will be returned by EFGS.
// We may already have some of that requested date's batches,
// but we may not have all its batches or batches from the subsequent days.
var result = await _receiverFactory().ExecuteAsync(date, lastWrittenBatchTag);
downloadCount++;
while (result != null && downloadCount <= _efgsConfig.MaxBatchesPerRun)
{
// If we haven't already received the current batchTag, process it
if (!_iksInDbContext.Received.Any(x => x.BatchTag == result.BatchTag))
{
_logger.WriteProcessingData(date, result.BatchTag);
try
{
await WriteSingleBatchAsync(result.BatchTag, result.Content);
lastWrittenBatchTag = result.BatchTag;
await UpdateJobInfoAsync(jobInfo, lastWrittenBatchTag);
}
catch (Exception e)
{
_logger.WriteEfgsError(e);
}
}
else
{
_logger.WriteBatchAlreadyProcessed(result.BatchTag);
}
// Move on to the next batchTag
if (!string.IsNullOrEmpty(result.NextBatchTag))
{
_logger.WriteNextBatchFound(result.NextBatchTag);
_logger.WriteBatchProcessedInNextLoop(result.NextBatchTag);
result = await _receiverFactory().ExecuteAsync(date, result.NextBatchTag);
downloadCount++;
}
else
{
// No next batch available, we're done for lastWrittenBatchTag's day's set of batches.
_logger.WriteNoNextBatch();
// Check if we can move on to a possible next day's worth of batches,
// now that this current set of batches is finished.
// Don't move past today though :)
if (date < _dateTimeProvider.Snapshot.Date)
{
_logger.WriteMovingToNextDay();
date = date.AddDays(1);
result = await _receiverFactory().ExecuteAsync(date, string.Empty);
downloadCount++;
}
else
{
// No more days with batches available, we're done.
_logger.WriteNoNextBatchNoMoreDays();
result = null;
}
}
// Log this for informational purposes
if (downloadCount > _efgsConfig.MaxBatchesPerRun)
{
_logger.WriteBatchMaximumReached(_efgsConfig.MaxBatchesPerRun);
}
}
}