注意：有人可以给我一个需要发送到 Azure blob 存储的示例 SAS 字符串（在右侧区域附加块信息）吗？我认为这就是我遇到的问题。我需要弄清楚每个块发送到 Azure 的字符串中 uri、key 等的顺序。
我想要完成的是从服务中获取一个 SAS 密钥，修改字符串密钥，以便 azure 知道我正在发送块，然后使用来自 Web 客户端的 sas 密钥发送文件的各个块. 我将每个文件分块为 2MB 块，并一次使用 JavaScript 库发送这些 2MB 块。所以下面代码中的每个“文件”只是一个 2MB 的文件块。
问题：我可以成功地从服务中获取 SAS 密钥，修改密钥使其包含块块信息，发送第一个块，然后从 blob 存储服务器接收响应。但是，当我发送第二个块时，对 blob 存储的流的请求挂起，然后最终超时。超时似乎专门发生在第二次请求到 blob 存储的流时。这段代码就在这里：
服务器网页客户端代码：
using (Stream requestStream = request.GetRequestStream())
{
inputStream.CopyTo(requestStream, file.ContentLength);
}
什么可能导致第二个块超时？会不会是钥匙的窗口关得太早了？下面是我的代码和一些截图：
private void WriteToBlob(HttpPostedFileBase file, string BlockId, FileProp fp)
{
var inputStream = file.InputStream;
Microsoft.WindowsAzure.StorageCredentialsSharedAccessSignature credentials =
new Microsoft.WindowsAzure.StorageCredentialsSharedAccessSignature(fp.facct);
string queryString = (new Uri(fp.folderName)).Query;
string RequestUri = string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}/{1}{2}&comp=block&blockid={3}",
fp.folderName, fp.fileName, queryString, Convert.ToBase64String(Encoding.UTF8.GetBytes(BlockId)));
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(RequestUri);
request.Method = "PUT";
request.ContentLength = inputStream.Length;
using (Stream requestStream = request.GetRequestStream())
{
inputStream.CopyTo(requestStream, file.ContentLength);
}
}
将块发送到 WEB 服务器客户端的 JAVASCRIPT 代码：
var running = 0;
var chunksize = (Modernizr.blobconstructor) ? uploadChunkSize : null; //if browser support Blob API
window.xhrPool = [];
$('#fileupload').fileupload({
url: url,
//formData: [{ name: 'param1', value: 1 }, { name: 'param2', value: 2}],
singleFileUploads: true, //each file is using an individual XHR request
//limitMultiFileUploads: 2, //This option is ignored, if singleFileUploads is set to true.
multipart: true,
maxChunkSize: chunksize, //server side is in streaming mode
sequentialUploads: true, //Set this option to true to issue all file upload requests in a sequential order instead of simultaneous requests.
dataType: 'json',
autoUpload: true,
//acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
progressInterval: 100,
bitrateInterval: 100,
maxFileSize: uploadFileSizeLimit
}).on('fileuploadadd', function (e, data) {
var filename = data.files[0].name;
var filesize = data.files[0].size;
if (filesize == 0) {
var zeroSizeErrMsg = sceneLayoutService.format('This file {filename} is empty please select files again without it. ', { filename: filename });
sceneLayoutService.showErrorDialog(zeroSizeErrMsg);
return;
}
if (window.availableStorageSize != null && window.availableStorageSize != '') {
if (filesize > window.availableStorageSize) {
var overSizeErrMsg = sceneLayoutService.format('File size of {filename} exceeds available storage space in your cloud drive. ', { filename: filename });
sceneLayoutService.showErrorDialog(overSizeErrMsg);
return;
}
} else {
alert('Unable to retrieve the storage usage.');
}
data.jqXHR = data.submit();
window.xhrPool.push(data.jqXHR);
sceneLayoutService.addFileToProgressDialog(data, cancelButton);
}).on('fileuploadprocessalways', function (e, data) {
}).on('fileuploadprogressall', function (e, data) {
}).on('fileuploadsubmit', function (e, data) {
var filesize = data.files[0].size;
if (filesize == 0) {
return false;
}
if (window.availableStorageSize != null && window.availableStorageSize != '') {
if (filesize > window.availableStorageSize) {
return false;
}
}
$('#dlgProgress').parent().show();
running++;
sceneLayoutService.showProgressDialog('Uploading files to ' + currentUser + '\'s Cloud Storage ...', abortAllUploads);
return true;
}).on('fileuploaddone', function (e, data) {
running--;
updateStorageQuota(function () {
var usedStorageSize = (window.usedStorageSize != null) ? bytesToSize(window.usedStorageSize, 2) : 0;
var totalStorageSize = (window.totalStorageSize != null) ? bytesToSize(window.totalStorageSize, 2) : 0;
var usageFooterStr = sceneLayoutService.format("Using {used} of {total} (%)", { used: usedStorageSize, total: totalStorageSize });
$('div.dlgProgressFooter').text(usageFooterStr);
});
var docGridUrl = window.baseUrl + '/CloudStorage/ChangePage?page=1&rand=' + sceneLayoutService.getRandomString(4);
$('#docGridPartial').load(docGridUrl, function () {
grid.init({
pageNumber: 1,
url: window.baseUrl + '/CloudStorage/ChangePage',
sortColumn: '',
sortDirection: ''
});
});
sceneLayoutService.updateFileUploadFinalStatus(data, 'done');
if (!data.result.success) {
debugger;
var errMsg = "";
if (data.result != null) {
if (data.result.message != null) {
errMsg += data.result.message;
}
if (data.result.error != null)
errMsg += data.result.error;
}
sceneLayoutService.showErrorDialog(errMsg);
}
window.removeXHRfromPool(data);
if (running == 0) {
$('#dlgProgress').parent().hide();
$('#progresses').empty();
}
}).on('fileuploadfail', function (e, data) {
running--;
sceneLayoutService.updateFileUploadFinalStatus(data, 'fail');
window.removeXHRfromPool(data);
if (running == 0) {
$('#dlgProgress').parent().hide();
$('#progresses').empty();
}
}).on('fileuploadprogress', function (e, data) {
//XHR upload onProgress event not fired at server-defined intervals/not supported in IE8 and IE9,
//will be supported in IE10 in terms of XMLHttpRequest Level 2 specification, http://caniuse.com/xhr2
sceneLayoutService.updateFileUploadProgress(data);
});
