[英]404 for a small period of time after uploading file to Azure Blob Storage
我將附件上傳到 Azure Blob 存儲。 上傳時我還創建了一個 SAS-Token; 我檢索到唯一的 URL,將其發送到立即打開的瀏覽器。
當我這樣做時,我經常(但不總是)檢索該資源不存在的 404。 幾秒鍾后刷新頁面時,它被正確檢索。
所以上傳附件后我似乎“太快了”。 有沒有辦法等到 Azure 准備好提供附件? 我原以為等待電話就足以實現這一目標。
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
調用,響應(包含 URL)返回到打開它的瀏覽器。
如果您注意到,您不會在此處等待上傳操作完成:
_azureStorageRepository.UploadFile(invoiceFilename, file);
請將其更改為:
await _azureStorageRepository.UploadFile(invoiceFilename, file);
而且您不應該看到 404 錯誤。 Azure Blob 存儲是強一致的。
此外,如@Fildor 在評論中提到的,將UploadFile
方法從public async void UploadFile
更改為public async Task UploadFile
。
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