JavaScript Azure Blob 存储移动 blob

Posted 2023-03-28

【中文标题】JavaScript Azure Blob 存储移动 blob

【英文标题】：JavaScript Azure Blob Storage move blob

【发布时间】：2021-10-08 18:22:00

【问题描述】：

我有一个 NodeJS 后端，它使用 Microsoft 的官方 blob 存储库 (@azure/storage-blob) 来管理我的 Blob 存储：

https://www.npmjs.com/package/@azure/storage-blob

必须将 blob 从一个文件夹移动到另一个文件夹。 不幸的是，我找不到任何文档。

到目前为止我所做的是：

const  BlobServiceClient  = require("@azure/storage-blob");

const blobServiceClient = BlobServiceClient.fromConnectionString(process.env.storageconnection);
const containerClient = blobServiceClient.getContainerClient('import');
const blobClient = containerClient.getBlobClient('toImport/' + req.body.file);
const downloadBlockBlobResponse = await blobClient.download();
... do some stuff with the value of the files

就像您在代码中看到的那样，我从文件夹“toImport”中读取了一个文件。之后，我想将文件移动到另一个文件夹“完成”。那可能吗？也许我需要创建文件的副本并删除旧的？

【问题讨论】：

Maybe I need to create a copy of the file and delete the old one? - 这正是您需要做的。您无需下载和上传。

但我该怎么做。我找不到那个命令。 getBlobClient() 有什么方法吗？

【参考方案1】：

因此，Azure Blob 存储不支持此类移动​​操作。您要做的就是将 blob 从源复制到目标，监控复制进度（因为复制操作是异步的）并在复制完成后删除 blob。

对于复制，您要使用的方法是beginCopyFromURL(string, BlobBeginCopyFromURLOptions)。

请看这段代码：

const  BlobServiceClient  = require("@azure/storage-blob");

const connectionString = "DefaultEndpointsProtocol=https;AccountName=account-name;AccountKey=account-key;EndpointSuffix=core.windows.net";
const container = "container-name";
const sourceFolder = "source";
const targetFolder = "target";
const blobName = "blob.png";

async function moveBlob() 
  const blobServiceClient = BlobServiceClient.fromConnectionString(connectionString);
  const containerClient = blobServiceClient.getContainerClient(container);
  const sourceBlobClient = containerClient.getBlobClient(`$sourceFolder/$blobName`);
  const targetBlobClient = containerClient.getBlobClient(`$targetFolder/$blobName`);
  console.log('Copying source blob to target blob...');
  const copyResult = await targetBlobClient.beginCopyFromURL(sourceBlobClient.url);
  console.log('Blob copy operation started successfully...');
  console.log(copyResult);
  do 
    console.log('Checking copy status...')
    const blobCopiedSuccessfully = await checkIfBlobCopiedSuccessfully(targetBlobClient);
    if (blobCopiedSuccessfully) 
      break;
    
   while (true);
  console.log('Now deleting source blob...');
  await sourceBlobClient.delete();
  console.log('Source blob deleted successfully....');
  console.log('Move operation complete.');


async function checkIfBlobCopiedSuccessfully(targetBlobClient) 
  const blobPropertiesResult = await targetBlobClient.getProperties();
  const copyStatus = blobPropertiesResult.copyStatus;
  return copyStatus === 'success';


moveBlob();

【讨论】：

太棒了。非常感谢！