Object Storage Service:Single-connection bandwidth throttling (OSS SDK for C# 1.0)

Observações

• Neste tópico, é usado o endpoint público da região China (Hangzhou). Para acessar o OSS a partir de outros serviços Alibaba Cloud na mesma região do OSS, use um endpoint interno. Para mais informações sobre regiões e endpoints do OSS, consulte Regions and endpoints.

• Este tópico demonstra a criação de uma instância OSSClient com um endpoint do OSS. Para configurações alternativas, como uso de domínio personalizado ou autenticação com credenciais do Security Token Service (STS), consulte Initialization (C# SDK V1).

Configurar limitação de largura de banda por conexão única para upload e download simples

O código de exemplo a seguir mostra como configurar a limitação de largura de banda por conexão única para upload e download simples:

using System.Text;
using Aliyun.OSS;
using Aliyun.OSS.Common;

// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. Example: examplebucket. 
var bucketName = "examplebucket";
// Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
var objectName = "exampledir/exampleobject.txt";
var objectContent = "More than just cloud.";
// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
const string region = "cn-hangzhou";
            
// Create a ClientConfiguration instance and modify parameters as required.
var conf = new ClientConfiguration();
            
// Use the signature algorithm V4.
conf.SignatureVersion = SignatureVersion.V4;
            
// Create an OSSClient instance.
var client = new OssClient(endpoint, accessKeyId, accessKeySecret, conf);
client.SetRegion(region);
try
{
    byte[] binaryData = Encoding.ASCII.GetBytes(objectContent);
    MemoryStream requestContent = new MemoryStream(binaryData);
    // Set the bandwidth limit for object upload to 100 KB/s, which is equal to 819,200 bit/s. 
    var putRequest = new PutObjectRequest(bucketName, objectName, requestContent)
    {
        TrafficLimit = 100*1024*8
    };
    client.PutObject(putRequest);
    Console.WriteLine("Put object succeeded");

    // Set the bandwidth limit for object download to 100 KB/s, which is equal to 819,200 bit/s. 
    var getRequest = new GetObjectRequest(bucketName, objectName)
    {
        TrafficLimit = 100 * 1024 * 8
    };
    var getResult = client.GetObject(getRequest);
    Console.WriteLine("Get object succeeded");
}
catch (Exception ex)
{
    Console.WriteLine("Put object failed, {0}", ex.Message);
}

Configurar limitação de largura de banda para upload e download com URLs assinadas

O código de exemplo a seguir mostra como configurar a limitação de largura de banda por conexão única ao usar URLs assinadas para fazer upload ou download de objetos:

using System.Text;
using Aliyun.OSS;
using Aliyun.OSS.Common;

// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. Example: examplebucket. 
var bucketName = "examplebucket";
// Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
var objectName = "exampledir/exampleobject.txt";
var objectContent = "More than just cloud.";
var downloadFilename  = "D:\\localpath\\examplefile.txt";
// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
const string region = "cn-hangzhou";
            
// Create a ClientConfiguration instance and modify parameters as required.
 var conf = new ClientConfiguration();
            
// Use the signature algorithm V4.
conf.SignatureVersion = SignatureVersion.V4;
            
// Create an OSSClient instance.
var client = new OssClient(endpoint, accessKeyId, accessKeySecret, conf);
client.SetRegion(region);
try
{       
    // Generate a signed URL to upload the object. 
    var generatePresignedUriRequest = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Put)
    {
        Expiration = DateTime.Now.AddHours(1),
    };

    // Set the bandwidth limit to 100 KB/s, which is equal to 819,200 bit/s. 
    generatePresignedUriRequest.AddQueryParam("x-oss-traffic-limit", "819200");

    var signedUrl = client.GeneratePresignedUri(generatePresignedUriRequest);
    // Use the signed URLs to upload the object. 
    var buffer = Encoding.UTF8.GetBytes(objectContent);
    using (var ms = new MemoryStream(buffer))
    {
        client.PutObject(signedUrl, ms);
    }
    Console.WriteLine("Put object by signatrue succeeded. {0} ", signedUrl.ToString());

    var metadata = client.GetObjectMetadata(bucketName, objectName);
    var etag = metadata.ETag;
    // Generate a signed URL to download the object. 
    // Set the bandwidth limit to 100 KB/s, which is equal to 819,200 bit/s. 
    var req = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Get);
    req.AddQueryParam("x-oss-traffic-limit", "819200");

    var uri = client.GeneratePresignedUri(req);
    // Use the signed URL to download the object. 
    OssObject ossObject = client.GetObject(uri);
    using (var file = File.Open(downloadFilename, FileMode.OpenOrCreate))
    {
        using (Stream stream = ossObject.Content)
        {
            int length = 4 * 1024;
            var buf = new byte[length];
            do
            {
                length = stream.Read(buf, 0, length);
                file.Write(buf, 0, length);
            } while (length != 0);
        }
    }
    Console.WriteLine("Get object by signatrue succeeded. {0} ", uri.ToString());
}
catch (Exception ex)
{
    Console.WriteLine("Put object failed, {0}", ex.Message);
}