This topic describes how to add parameters in an object upload or download request to set the limit of upload or download bandwidth. This ensures sufficient bandwidth for other applications.
Usage notes
In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access Object Storage Service (OSS) by using other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about the regions and endpoints supported by OSS, see Regions and endpoints.
In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.
Configure single-connection bandwidth throttling for simple upload and download
The following sample code provides an example on how to configure single-connection bandwidth throttling for simple upload and download:
#include <alibabacloud/oss/OssClient.h>
#include <fstream>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* Initialize information about the account that is used to access OSS. */
/* 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. */
std::string Endpoint = "yourEndpoint";
/* 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. */
std::string Region = "yourRegion";
/* Specify the name of the bucket. Example: examplebucket. */
std::string BucketName = "examplebucket";
/* Specify the full path of the object. Do not include the bucket name in the full path of the object. Example: exampledir/exampleobject.txt. */
std::string ObjectName = "exampledir/exampleobject.txt";
/* Initialize resources, such as network resources. */
InitializeSdk();
ClientConfiguration conf;
conf.signatureVersion = SignatureVersionType::V4;
/* 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. */
auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
OssClient client(Endpoint, credentialsProvider, conf);
client.SetRegion(Region);
/* Upload the object. */
std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>("yourLocalFilename", std::ios::in|std::ios::binary);
PutObjectRequest putrequest(BucketName, ObjectName,content);
/* Set the maximum speed to upload the object to 100 KB/s. */
putrequest.setTrafficLimit(819200);
auto putoutcome = client.PutObject(putrequest);
/* Download the object to local memory. */
GetObjectRequest getrequest(BucketName, ObjectName);
/* Set the maximum speed to download the object to 100 KB/s. */
getrequest.setTrafficLimit(819200);
auto getoutcome = client.GetObject(getrequest);
/* Release resources, such as network resources. */
ShutdownSdk();
return 0;
}Configure bandwidth throttling for upload and download that use signed URLs
The following sample code provides an example on how to configure single-connection bandwidth throttling when you use signed URLs to upload or download objects:
#include <alibabacloud/oss/OssClient.h>
#include <fstream>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* Initialize information about the account that is used to access OSS. */
/* 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. */
std::string Endpoint = "yourEndpoint";
/*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.*/
std::string Region = "yourRegion";
/* Specify the name of the bucket. Example: examplebucket. */
std::string BucketName = "examplebucket";
/* Specify the full path of the object. Do not include the bucket name in the full path of the object. Example: exampledir/exampleobject.txt. */
std::string ObjectName = "exampledir/exampleobject.txt";
/* Initialize resources, such as network resources. */
InitializeSdk();
ClientConfiguration conf;
conf.signatureVersion = SignatureVersionType::V4;
/* 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. */
auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
OssClient client(Endpoint, credentialsProvider, conf);
client.SetRegion(Region);
/* Set the validity period of the signed URL to 32,400 seconds. */
std::time_t expires = std::time(nullptr) + 1200;
/* Generate the signed URL that is used to upload the object. */
GeneratePresignedUrlRequest putrequest(BucketName, ObjectName, Http::Put);
putrequest.setExpires(expires);
/* Set the maximum speed to upload the object to 100 KB/s. */
putrequest.setTrafficLimit(819200);
auto genOutcome = client.GeneratePresignedUrl(putrequest);
std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
*content << "test cpp sdk";
/* Display the signed upload URL. */
std::cout << "Signed upload URL:" << genOutcome.result() << std::endl;
/* Use the signed URL to upload the object. */
auto outcome = client.PutObjectByUrl(genOutcome.result(), content);
/* Generate the signed URL that is used to download the object. */
GeneratePresignedUrlRequest getrequest(BucketName, ObjectName, Http::Get);
getrequest.setExpires(expires);
/* Set the maximum speed to download the object to 100 KB/s. */
getrequest.setTrafficLimit(819200);
genOutcome = client.GeneratePresignedUrl(getrequest);
/* Display the signed download URL. */
std::cout << "Signed download URL:" << genOutcome.result() << std::endl;
/* Use the signed URL to download the object. */
auto goutcome = client.GetObjectByUrl(genOutcome.result());
/* Release resources, such as network resources. */
ShutdownSdk();
return 0;
}