public void Download(CancellationToken cancellationToken)
{
try
{
_logger.LogDebug("Downloading...");
_logger.LogTrace("size = " + _size);
for (int i = 0; i < _urls.Length; i++)
{
_logger.LogTrace("urls[" + i + "].Url = " + _urls[i].Url);
_logger.LogTrace("urls[" + i + "].Country = " + _urls[i].Country);
_logger.LogTrace("urls[" + i + "].PartSize = " + _urls[i].PartSize);
}
_logger.LogTrace("chunksData.ChunkSize = " + _chunksData.ChunkSize);
_logger.LogTrace("chunksData.Chunks.Length = " + _chunksData.Chunks.Length);
Assert.MethodCalledOnlyOnce(ref _downloadHasBeenCalled, "Download");
using (var fileStream = OpenFileStream(cancellationToken))
{
bool retry;
do
{
bool success =
_urls.Any(url => TryDownload(url, fileStream, cancellationToken));
if (success)
{
retry = false;
}
else
{
_logger.LogWarning("All server requests have failed. Checking if retry is possible...");
_retryStrategy.OnRequestFailure();
_timeoutCalculator.OnRequestFailure();
retry = _retryStrategy.ShouldRetry;
if (!retry)
{
throw new DownloadFailureException("Download failure.");
}
_logger.LogDebug(string.Format("Retry is possible. Waiting {0}ms until before attempt...",
_retryStrategy.DelayBeforeNextTry));
Threading.CancelableSleep(_retryStrategy.DelayBeforeNextTry, cancellationToken);
_logger.LogDebug("Trying to download data once again from each server...");
}
} while (retry);
}
_logger.LogDebug("Downloading finished.");
}
catch (Exception e)
{
_logger.LogDebug("Download has failed.", e);
throw;
}
}
public static void TryExecute(Action action, IRequestRetryStrategy retryStrategy, PatchKit.Unity.Patcher.Cancellation.CancellationToken cancellationToken)
{
do
{
try
{
action();
return;
}
catch (IOException e)
{
retryStrategy.OnRequestFailure();
if (!retryStrategy.ShouldRetry)
{
DebugLogger.LogError(string.Format("An IO Exception has occured: {0}. rethrowing.", e));
throw;
}
DebugLogger.LogWarning(string.Format("An IO Exception has occured: {0}. retrying...", e));
Threading.CancelableSleep(retryStrategy.DelayBeforeNextTry, cancellationToken);
}
} while (retryStrategy.ShouldRetry);
}
private IApiResponse SendRequest(Func <Request> requestBuilder)
{
try
{
var request = requestBuilder();
IApiResponse apiResponse;
bool retry;
do
{
if (!TrySendRequest(_connectionSettings.MainServer, request, ServerType.MainServer,
out apiResponse))
{
if (_connectionSettings.CacheServers != null &&
request.Method == RequestMethod.Get)
{
foreach (var cacheServer in _connectionSettings.CacheServers)
{
if (TrySendRequest(cacheServer, request, ServerType.CacheServer, out apiResponse))
{
break;
}
}
}
}
if (apiResponse == null)
{
Logger.LogWarning(
"Connection attempt to every server has failed. Checking whether retry is possible...");
RequestTimeoutCalculator.OnRequestFailure();
RequestRetryStrategy.OnRequestFailure();
retry = RequestRetryStrategy.ShouldRetry;
if (!retry)
{
Logger.LogError("Retry is not possible.");
throw new ApiConnectionException(request.MainServerExceptions,
request.CacheServersExceptions);
}
Logger.LogDebug(
string.Format(
"Retry is possible. Waiting {0}ms before next attempt...",
RequestRetryStrategy.DelayBeforeNextTry));
Thread.Sleep(RequestRetryStrategy.DelayBeforeNextTry);
Logger.LogDebug("Trying to get response from servers once again...");
}
else
{
retry = false;
}
} while (retry);
Logger.LogDebug("Successfully got response.");
Logger.LogTrace(
string.Format("Response body: {0}", apiResponse.Body));
RequestTimeoutCalculator.OnRequestSuccess();
RequestRetryStrategy.OnRequestSuccess();
return(apiResponse);
}
catch (Exception e)
{
Logger.LogError("Failed to get response.", e);
throw;
}
}
/// <summary>
/// Retrieves specified resource from API.
/// </summary>
/// <param name="path">The path to the resource.</param>
/// <param name="query">The query of the resource.</param>
/// <returns>Response with resource result.</returns>
/// <exception cref="ApiConnectionException">Could not connect to API.</exception>
public IApiResponse GetResponse(string path, string query)
{
try
{
Logger.LogDebug("Getting response for path: '" + path + "' and query: '" + query + "'...");
var request = new Request
{
Path = path,
Query = query,
MainServerExceptions = new List <Exception>(),
CacheServersExceptions = new List <Exception>()
};
IApiResponse apiResponse;
bool retry;
do
{
if (!TryGetResponse(_connectionSettings.MainServer, request, ServerType.MainServer,
out apiResponse))
{
if (_connectionSettings.CacheServers != null)
{
foreach (var cacheServer in _connectionSettings.CacheServers)
{
if (TryGetResponse(cacheServer, request, ServerType.CacheServer, out apiResponse))
{
break;
}
}
}
}
if (apiResponse == null)
{
Logger.LogWarning(
"Connection attempt to every server has failed. Checking whether retry is possible...");
RequestTimeoutCalculator.OnRequestFailure();
RequestRetryStrategy.OnRequestFailure();
retry = RequestRetryStrategy.ShouldRetry;
if (!retry)
{
Logger.LogError("Retry is not possible.");
throw new ApiConnectionException(request.MainServerExceptions,
request.CacheServersExceptions);
}
Logger.LogDebug(
"Retry is possible. Waiting " + RequestRetryStrategy.DelayBeforeNextTry + "ms before next attempt...");
Thread.Sleep(RequestRetryStrategy.DelayBeforeNextTry);
Logger.LogDebug("Trying to get response from servers once again...");
}
else
{
retry = false;
}
} while (retry);
Logger.LogDebug("Successfully got response.");
Logger.LogTrace("Response body: " + apiResponse.Body);
RequestTimeoutCalculator.OnRequestSuccess();
RequestRetryStrategy.OnRequestSuccess();
return(apiResponse);
}
catch (Exception e)
{
Logger.LogError("Failed to get response.", e);
throw;
}
}
