在 Node.js 中列出来自 Azure Blob 存储和读取流的 blob

Question

这是我列出 blob 的代码。

已编辑！！！

--------------------------------编辑-------- ----------------------------------

我编辑了代码并用这个 TypeScript 重写了：

    const blobServiceClient = new BlobServiceClient(`https://${accountName}.blob.core.windows.net?${sasToken}`,
      pipeline)
    const containerClient = blobServiceClient.getContainerClient(containerName)
    console.log(containerClient)
    if (!containerClient.exists()) {
      console.log("the container does not exit")
      await containerClient.create()

    }
    const client = containerClient.getBlockBlobClient(this.currentFile.name)

    //name of uploded blob
    console.log(this.currentFile.name)
    //metaata from the blob
    console.log(client)

    //List each blobs in the container
    for await (const blob of containerClient.listBlobsFlat()) {
      console.log('\t', blob.name);
      const blockBlobClient = containerClient.getBlockBlobClient(blob.name);
      const downloadBlockBlobResponse = await blockBlobClient.download(0);
      console.log('\nDownloaded blob content...');
      console.log('\t', await streamToString(downloadBlockBlobResponse.readableStreamBody));
      //end of loop
  }



  async function streamToString(readableStream) {
    return new Promise((resolve, reject) => {
      const chunks = [];
      readableStream.on("data", (data) => {
        chunks.push(data.toString());
      });
      readableStream.on("end", () => {
        resolve(chunks.join(""));
      });
      readableStream.on("error", reject);
    });
  }

但随后我在浏览器中收到错误消息：

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'on' of undefined TypeError: Cannot read property 'on' of undefined

Answer 1

通过调用 download 方法下载 blob。示例代码包括一个名为 streamToString 的辅助函数，用于将 Node.js 可读流读入字符串 .

将此代码添加到主函数的末尾：

const blockBlobClient = containerClient.getBlockBlobClient(blob.name);
const downloadBlockBlobResponse = await blockBlobClient.download(0);
console.log('\nDownloaded blob content...');
console.log('\t', await streamToString(downloadBlockBlobResponse.readableStreamBody));

在主函数之后添加这个辅助函数：

// A helper function used to read a Node.js readable stream into a string
async function streamToString(readableStream) {
  return new Promise((resolve, reject) => {
    const chunks = [];
    readableStream.on("data", (data) => {
      chunks.push(data.toString());
    });
    readableStream.on("end", () => {
      resolve(chunks.join(""));
    });
    readableStream.on("error", reject);
  });
}

更多细节，你可以参考这个article。

在 Node.js 中列出来自 Azure Blob 存储和读取流的 blob

List blob from Azure Blob Storage and Readstream in Node.js

javascript

azure

azure-storage

node.js

azure-blob-storage