public async override Task <gDownloadFileResponse> GetDownloadFile(gDownloadFileRequest request, ServerCallContext context)
{
var response = new gDownloadFileResponse();
var result = await _mediatr.Send(new GetDownloadByIdQuery(request.DownloadId, request.RequesterAddress));
response.Status = result.Convert();
if (result.State == OperationState.Success)
{
response.FileItem = result.File.Convert();
response.DownloadSpeed = result.DownloadSpeed;
}
return(response);
}
public async Task <StartDownloadResult> Handle(StartDownloadCommand request, CancellationToken cancellationToken)
{
StartDownloadResult Result = new StartDownloadResult();
gDownloadFileRequest downloadRequest = new gDownloadFileRequest()
{
DownloadId = request.DownloadId,
RequesterAddress = _httpContext.Request.Host.Value
};
// query the api
gDownloadFileResponse dResponse = await _fileMngClient.GetDownloadFileAsync(downloadRequest);
if (dResponse == null)
{
Result.ErrorContent = new ErrorContent("No response has been received from the server.", ErrorOrigin.Server);
return(Result);
}
if (dResponse.Status.Status != Protos.RequestStatus.Success)
{
Result.ErrorContent = new ErrorContent(dResponse.Status.Message, ErrorOrigin.None);
return(Result);
}
string filePath = Path.Combine(_uploadOpt.UploadPath, dResponse.FileItem.UserId, dResponse.FileItem.Id, dResponse.FileItem.Id);
// Check file exist on disk
if (!File.Exists(filePath))
{
_httpContext.Response.StatusCode = 404;
Result.ErrorContent = new ErrorContent("File not found, it may have been moved or deleted!", ErrorOrigin.Server);
return(Result);
}
// Check file is not too large
if (dResponse.FileItem.Size > uint.MaxValue) // ~4Gb
{
_httpContext.Response.StatusCode = 413;
Result.ErrorContent = new ErrorContent("File is too large!", ErrorOrigin.Server);
return(Result);
}
// Get the response header information made by the current http request.
HttpResponseHeader responseHeader = GetResponseHeader(dResponse.FileItem);
if (responseHeader == null)
{
Result.ErrorContent = new ErrorContent("Invalid response header!", ErrorOrigin.Server);
return(Result);
}
// All good, start download
var dStatus = await StartDownload(responseHeader, filePath, dResponse.DownloadSpeed);
// Once download is completed we send request to increment download count
if (dStatus == DownloadStatus.COMPLETED)
{
await _fileMngClient.FileDownloadCompletedAsync(new gDownloadCompletedRequest()
{
FileId = dResponse.FileItem.Id,
RequesterIp = _httpContext.Request.Host.Value
});
}
else
{
_logger.LogInformation("Download request status: " + dStatus);
}
return(null);
}