Torch Object Storage
Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceC++Object InterfaceUpload ObjectUpload Callback (C++ SDK)
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Download PDFUpload Object
Upload Callback (C++ SDK)
Copy pageDownload PDFUpload Callback (C++ SDK)
An upload callback refers to a process in which the client includes a callback parameter in its request. Upon completion of the upload, the server sends a synchronous POST callback request to the third-party application server specified in the Callback parameter. Only after the third-party server confirms receipt and returns a result does the server return all results to the client.
Sample Code
Implementation of upload callback for standard upload
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string objectName = "exampledir/exampleobject.txt";
std::string callback = "your callback param";
std::string callbackVar = "your callback custom variable";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
std::string data("Object data to be uploaded");
auto ss = std::make_shared<std::stringstream>(data);
PutObjectV2Input input(bucketName, objectName, ss);
input.setCallBack(callback);
input.setCallBackVar(callbackVar);
auto output = client.putObject(input);
if (!output.isSuccess()) {
std::cout << "PutObject failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "PutObject success. the object etag:" << output.result().getETag() << std::endl;
CloseClient();
return 0;
}
Implementing upload callbacks for multipart uploads
#include "TosClientV2.h"
using namespace VolcengineTos;
static int64_t getFileSize(const std::string& file)
{
std::fstream f(file, std::ios::in | std::ios::binary);
f.seekg(0, f.end);
int64_t size = f.tellg();
f.close();
return size;
}
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string objectName = "exampledir/exampleobject.txt";
std::string callback = "your callback param";
std::string callbackVar = "your callback custom variable";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
CreateMultipartUploadInput input(bucketName, objectName);
input.setAcl(ACLType::PublicRead);
input.setStorageClass(StorageClassType::IA);
input.setMeta({{"self-test", "yes"}});
auto upload = client.createMultipartUpload(input);
if (!upload.isSuccess()) {
std::cout << "createMultipartUpload failed." << upload.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "createMultipartUpload success." << std::endl;
std::string fileToUpload = "yourLocalFilename";
int64_t partSize = 5 * 1024 * 1024;
std::vector<UploadedPartV2> partResList;
auto fileSize = getFileSize(fileToUpload);
int partCount = static_cast<int>(fileSize / partSize);
if (fileSize % partSize != 0) {
partCount++;
}
auto uploadId = upload.result().getUploadId();
for (int i = 1; i <= partCount; i++) {
auto offset = partSize * (i - 1);
auto size = (partSize < fileSize - offset) ? partSize : (fileSize - offset);
std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>(fileToUpload, std::ios::in|std::ios::binary);
content->seekg(offset, std::ios::beg);
UploadPartV2Input uploadPartInput(bucketName, objectName,uploadId, size,i,content);
auto uploadPartOutput = client.uploadPart(uploadPartInput);
if (!uploadPartOutput.isSuccess()) {
std::cout << "uploadPart failed." << upload.error().String() << std::endl;
CloseClient();
return -1;
}
UploadedPartV2 part(i, uploadPartOutput.result().getETag());
partResList.push_back(part);
}
CompleteMultipartUploadV2Input completeMultipartUploadInput(bucketName, objectName, uploadId, partResList);
auto com = client.completeMultipartUpload(completeMultipartUploadInput);
completeMultipartUploadInput.setCallBack(callback);
completeMultipartUploadInput.setCallBackVar(callbackVar);
if (!com.isSuccess()) {
std::cout << "CompleteMultipartUpload failed." << upload.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "CompleteMultipartUpload success." << com.result().getRequestInfo().getRequestId() << std::endl;
CloseClient();
return 0;
}
Last updated: 2025.09.25 14:22:47
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