[英]404 for a small period of time after uploading file to Azure Blob Storage
我将附件上传到 Azure Blob 存储。 上传时我还创建了一个 SAS-Token; 我检索到唯一的 URL,将其发送到立即打开的浏览器。
当我这样做时,我经常(但不总是)检索该资源不存在的 404。 几秒钟后刷新页面时,它被正确检索。
所以上传附件后我似乎“太快了”。 有没有办法等到 Azure 准备好提供附件? 我原以为等待电话就足以实现这一目标。
public async void UploadFile(string filename, byte[] filecontent)
{
var containerClient = _blobServiceclient.GetBlobContainerClient("attachments");
var blobClient = containerClient.GetBlobClient(filename);
using (var stream = new MemoryStream(filecontent))
{
await blobClient.UploadAsync(stream, new BlobHttpHeaders { ContentType = GetContentTypeByFilename(filename) });
}
}
public async Task<string> GetLinkForFile(string filename)
{
var containerClient = _blobServiceclient.GetBlobContainerClient("attachments");
var sasBuilder = new BlobSasBuilder()
{
BlobContainerName = containerName,
BlobName = filename,
Resource = "b",
StartsOn = DateTime.UtcNow.AddMinutes(-1),
ExpiresOn = DateTime.UtcNow.AddMinutes(5),
};
// Specify read permissions
sasBuilder.SetPermissions(BlobSasPermissions.Read);
var credentials = new StorageSharedKeyCredential(_blobServiceclient.AccountName, _accountKey);
var sasToken = sasBuilder.ToSasQueryParameters(credentials);
// Construct the full URI, including the SAS token.
UriBuilder fullUri = new UriBuilder()
{
Scheme = "https",
Host = string.Format("{0}.blob.core.windows.net", _blobServiceclient.AccountName),
Path = string.Format("{0}/{1}", containerName, filename),
Query = sasToken.ToString()
};
return fullUri.ToString();
}
public async Task<Document> GetInvoice(byte[] invoiceContent, string invoiceFilename)
{
string filePath = await GetLinkForFile(invoiceFilename);
UploadFile(invoiceFilename, file);
return new Document()
{
Url = filePath
};
}
GetInvoice 方法由GetInvoice
调用,响应(包含 URL)返回到打开它的浏览器。
如果您注意到,您不会在此处等待上传操作完成:
_azureStorageRepository.UploadFile(invoiceFilename, file);
请将其更改为:
await _azureStorageRepository.UploadFile(invoiceFilename, file);
而且您不应该看到 404 错误。 Azure Blob 存储是强一致的。
此外,如@Fildor 在评论中提到的,将UploadFile
方法从public async void UploadFile
更改为public async Task UploadFile
。
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