/// <summary>
/// 视频消息文件的缩略图
/// </summary>
/// <returns></returns>
public ActionResult MessageThumbFile()
{
FileDownloadQueueWithMediaIdResult args = RequestArgs <FileDownloadQueueWithMediaIdResult>();
if (args == null)
{
return(RespondResult(false, "参数无效。"));
}
_messageManager.MessageThumbFile(args);
return(RespondResult());
}
public void MessageThumbFile(FileDownloadQueueWithMediaIdResult args)
{
Guid messageId = Guid.Parse(args.Tag);
SqlStructureBuild sqlBuild = new SqlStructureBuild();
sqlBuild.Table = "Message";
sqlBuild.Type = SqlExpressionType.Update;
sqlBuild.AddParameter("Id", messageId, true);
sqlBuild.AddParameter("ThumbContentType", args.ContentType);
sqlBuild.AddParameter("ThumbUrl", _fileService.FileServiceUri + args.OutputFile);
sqlBuild.AddParameter("ThumbLength", args.FileLength);
_dataBase.ExcuteSqlExpression(sqlBuild.GetSqlExpression());
}
private void Download(FileDownloadQueueEntity item)
{
_log.Write("下载队列中的文件", JsonConvert.SerializeObject(item), TraceEventType.Verbose);
DomainContext domainContext = _fileDomainPool.GetDomainContext(item.Domain);
if (domainContext == null)
{
item.Status = FileDownloadQueueItemStatus.Done;
item.Success = false;
item.Message = "无效域";
item.FinishTime = DateTime.Now;
_dataBase.Update(item);
return;
}
string targetDir = Path.Combine(_serverRootDir, "FileStore", item.Domain.ToString());
if (Directory.Exists(targetDir) == false)
{
Directory.CreateDirectory(targetDir);
}
string accessToken = domainContext.AccessToken;
HttpDownloadArgs downloadArgs = new HttpDownloadArgs();
downloadArgs.Url = String.Format(
"http://file.api.weixin.qq.com/cgi-bin/media/get?access_token={0}&media_id={1}",
accessToken, item.MediaId);
downloadArgs.TargetDir = targetDir;
HttpDownloadResult downloadResult = _httpService.Download(downloadArgs);
if (downloadResult.Success == false)
{
item.Status = FileDownloadQueueItemStatus.Done;
item.Success = false;
item.Message = "下载失败：" + downloadResult.Message;
item.FinishTime = DateTime.Now;
_dataBase.Update(item);
return;
}
item.Status = FileDownloadQueueItemStatus.Done;
item.Success = downloadResult.Success;
item.Message = downloadResult.Message;
item.OutputFile = String.Format("FileStore/{0}/{1}", item.Domain, downloadResult.StoreFileName);
item.ContentType = downloadResult.ContentType;
item.FileLength = (int)(downloadResult.FileLength / 1024);
FileDownloadQueueWithMediaIdResult result = new FileDownloadQueueWithMediaIdResult();
result.Success = item.Success;
result.Message = item.Message;
result.OutputFile = item.OutputFile;
result.ContentType = item.ContentType;
result.Tag = item.Tag;
result.MediaId = item.MediaId;
result.FileLength = item.FileLength;
_log.Write("下载队列中的文件返回（WithMediaId）", JsonConvert.SerializeObject(result), TraceEventType.Verbose);
//把下载结果POST到回调地址上
HttpRequestArgs requestArgs = new HttpRequestArgs();
requestArgs.Method = "POST";
requestArgs.Url = item.CallbackUrl;
requestArgs.Content = JsonConvert.SerializeObject(result);
HttpRequestResult requestResult = _httpService.Request(requestArgs);
if (requestResult.Success)
{
ApiResult callbackApiResult = JsonConvert.DeserializeObject <ApiResult>(requestResult.Content);
if (callbackApiResult.Success == false)
{
item.Status = FileDownloadQueueItemStatus.Done;
item.Success = false;
item.Message = "回调失败：" + callbackApiResult.Message;
item.FinishTime = DateTime.Now;
}
}
else
{
item.Status = FileDownloadQueueItemStatus.Done;
item.Success = false;
item.Message = "回调失败：" + requestResult.Exception.Message;
item.FinishTime = DateTime.Now;
}
_dataBase.Update(item);
}