从 azure blob 存储文件生成一个 Zip 文件 [英] generate a Zip file from azure blob storage files

问题描述

我的 windows azure blob 存储中存储了一些文件.我想获取这些文件，创建一个 zip 文件并将它们存储在一个新文件夹中.然后返回 zip 文件的路径.设置对 zip 文件位置的权限，以便我的用户可以通过单击链接将 zip 文件下载到他们的本地计算机

I have some files stored in my windows azure blob storage. I want to take these files, create a zip file and store them in a new folder. Then return the path to the zip file. Set permission to the zip file location so that my users can download the zip file to their local machines by clicking on the link

 https://mystorage.blob.core.windows.net/myfiles/2b5f8ea6-3dc2-4b77-abfe-4da832e02556/AppList/isjirleq/mydocs1.doc
 https://mystorage.blob.core.windows.net/myfiles/2b5f8ea6-3dc2-4b77-abfe-4da832e02556/tempo/xyz/mymusic.mp3
 https://mystorage.blob.core.windows.net/myfiles/2b5f8ea6-3dc2-4b77-abfe-4da832e02556/general/video/myVideo.wmv
 https://mystorage.blob.core.windows.net/myfiles/2b5f8ea6-3dc2-4b77-abfe-4da832e02556/photo/photo1.png

我希望能够遍历这些文件并将它们全部压缩在一起以创建一个新的 zip 文件

I want to be able to loop through these files and zip them all together to create a new zip file

(https://mystorage.blob.core.windows.net/myzippedfiles/allmyFiles.zip ) 并返回 zip 文件的路径

(https://mystorage.blob.core.windows.net/myzippedfiles/allmyFiles.zip ) and return the path to the zip file

我的天蓝色 blob 中有大量文件.所以下载、压缩和上传它们不是一个好主意.

I have a large number of files in my azure blob. So downloading, zipping and uploading them is not a good idea.

我该怎么做?我需要一些示例代码来做到这一点

How can I do this? I need some sample code to do this

推荐答案

通过使用 blob 流将文件直接压缩到输出流，我们已经(部分地)解决了这个问题.这避免了下载压缩然后发送的问题，并避免了发生这种情况时的延迟(我们使用了 ICSharpZipLib，参考).但这仍然意味着通过 Web 服务器路由流:

We have solved this problem (partially) by zipping the files directly to the output stream using the blob streams. This avoids the issue of downloading zipping then sending and avoids the delay while this happens (we used ICSharpZipLib, reference). But it still means routing the stream through the web server:

  public void ZipFilesToResponse(HttpResponseBase response, IEnumerable<Asset> files, string zipFileName)
    {
        using (var zipOutputStream = new ZipOutputStream(response.OutputStream))
        {
            zipOutputStream.SetLevel(0); // 0 - store only to 9 - means best compression
            response.BufferOutput = false;
            response.AddHeader("Content-Disposition", "attachment; filename=" + zipFileName);
            response.ContentType = "application/octet-stream";

            foreach (var file in files)
            {
                var entry = new ZipEntry(file.FilenameSlug())
                {
                    DateTime = DateTime.Now,
                    Size = file.Filesize
                };
                zipOutputStream.PutNextEntry(entry);
                storageService.ReadToStream(file, zipOutputStream);
                response.Flush();
                if (!response.IsClientConnected)
                {
                   break;
                }
            }
            zipOutputStream.Finish();
            zipOutputStream.Close();
        }
        response.End();
    }

存储服务只是这样做:

public void ReadToStream(IFileIdentifier file, Stream stream, StorageType storageType = StorageType.Stored, ITenant overrideTenant = null)
    {
        var reference = GetBlobReference(file, storageType, overrideTenant);
        reference.DownloadToStream(stream);
    }
private CloudBlockBlob GetBlobReference(IFileIdentifier file, StorageType storageType = StorageType.Stored, ITenant overrideTenant = null)
        {
            var filepath = GetFilePath(file, storageType);
            var container = GetTenantContainer(overrideTenant);
            return container.GetBlockBlobReference(filepath);
        }

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