Azure Blob存储-随进度上载文件

Question

我有以下代码-上传文件到Azure-Blob-Storage是很正常的，但是，当我上传文件而不是多次执行onProgress时，我只使用file.size值执行(并且总是)一次(所以它正在缓慢地发送)文件到azure，但是进度只在完成时执行一次。

    const requestOptions = this.mergeWithDefaultOptions(perRequestOptions);
    const client = this.getRequestClient(requestOptions);
    const containerClient = await client.getContainerClient(this.options.containerName);
    const blobClient = await containerClient.getBlockBlobClient(file.name);
    const uploadStatus = await blobClient.upload(file.buffer, file.size, {onProgress: progressCallBack});

我想知道的是，对于这个库，这种结果是否正常(对于从azure下载文件，同样的方法也可以正常工作)。

Answer 1

根据我的测试，该方法是一种非并行上传方法，它只向Azure Storage服务器发送单个Put Blob请求。更多详情，请参考here。

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因此，如果您希望多次执行onProgress，我建议您使用uploadStream方法。上传使用Put Block操作和Put Block List操作。有关更多详细信息，请访问here

例如

try {
    var creds = new StorageSharedKeyCredential(accountName, accountKey);
    var blobServiceClient = new BlobServiceClient(
      `https://${accountName}.blob.core.windows.net`,
      creds
    );
    var containerClient = blobServiceClient.getContainerClient("upload");
    var blob = containerClient.getBlockBlobClient(
      "spark-3.0.1-bin-hadoop3.2.tgz"
    );

    var maxConcurrency = 20; // max uploading concurrency
    var blockSize = 4 * 1024 * 1024; // the block size in the uploaded block blob
    var res = await blob.uploadStream(
      fs.createReadStream("d:/spark-3.0.1-bin-hadoop3.2.tgz", {
        highWaterMark: blockSize,
      }),
      blockSize,
      maxConcurrency,
      { onProgress: (ev) => console.log(ev) }
    );
    console.log(res._response.status);
  } catch (error) {
    console.log(error);
  }

​

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