Question

使用AWS S3 C ++ SDK向某个IAM用户上载.jpg图像会带来巨大的时间延迟，这在任何情况下都是由于网络流量和延迟问题引起的。我正在为我的应用程序使用自由层S3版本和MSVC 2017 64位（在Windows 10 PC上）。这是示例代码：

Aws::SDKOptions options;
Aws::InitAPI(options);

Aws::Client::ClientConfiguration config;
config.region = Aws::Region::US_EAST_2;

Aws::S3::S3Client s3_client(Aws::Auth::AWSCredentials(KEY,ACCESS_KEY), config);

const Aws::String bucket_name = BUCKET;
const Aws::String object_name = "image.jpg";

Aws::S3::Model::PutObjectRequest put_object_request;

put_object_request.SetBucket(bucket_name);
put_object_request.SetKey(object_name);

std::shared_ptr<Aws::IOStream> input_data =
        Aws::MakeShared<Aws::FStream>("PutObjectInputStream",
                                      "../image.jpg",
                                      std::ios_base::in | std::ios::binary);

put_object_request.SetBody(input_data);
put_object_request.SetContentType("image/jpeg");

input_data->seekg(0LL, input_data->end);
put_object_request.SetContentLength(static_cast<long>(input_data->tellg()));

auto put_object_outcome = s3_client.PutObject(put_object_request);

当我上传的图片总大小超过100KB时

PutObject（put_object_request）;

对于520KB图像，

执行时间超过2分钟。

我使用Python boto3尝试了相同的示例，同一张图片的总上传时间约为25s。

有人遇到过同样的问题吗？

Answer 1

仔细查看AWS github repo之后，我发现了问题所在。

问题是 WinHttpSyncHttpClient 进行了限制并在内部重置了上载活动，因此没有退出上载线程并最终中止了事务。通过添加自定义超时值，问题得以解决。

我使用分段上传来重新实现该示例，因为它似乎更健壮和易于管理。尽管我认为C ++ SDK不可用，但事实并非如此，因为TransferManager对C ++所做的工作相同（不是像Java，.NET和PHP那样使用S3标头）。

感谢AWS github存储库中的KaibaLopez和SCalwas，他们帮助我解决了这些问题（issue1，issue2）。我要粘贴示例代码，以防有人遇到相同的问题：

#include "pch.h"
#include <iostream>
#include <fstream>
#include <filesystem>

#include <aws/core/Aws.h>
#include <aws/core/auth/AWSCredentials.h>
#include <aws/s3/S3Client.h>
#include <aws/s3/model/Bucket.h>
#include <aws/transfer/TransferManager.h>
#include <aws/transfer/TransferHandle.h>

static const char* KEY = "KEY";
static const char* BUCKET = "BUCKET_NAME";
static const char* ACCESS_KEY = "AKEY";
static const char* OBJ_NAME = "img.jpg";
static const char* const ALLOCATION_TAG = "S3_SINGLE_OBJ_TEST";

int main()
{
    Aws::SDKOptions options;
    Aws::InitAPI(options);
    {
        Aws::Client::ClientConfiguration config;
        config.region = Aws::Region::US_EAST_2;
        config.requestTimeoutMs = 20000;

        auto s3_client = std::make_shared<Aws::S3::S3Client>(Aws::Auth::AWSCredentials(KEY, ACCESS_KEY), config);

        const Aws::String bucket_name = BUCKET;
        const Aws::String object_name = OBJ_NAME;
        const Aws::String key_name = OBJ_NAME;

        auto s3_client_executor = Aws::MakeShared<Aws::Utils::Threading::DefaultExecutor>(ALLOCATION_TAG);
        Aws::Transfer::TransferManagerConfiguration trConfig(s3_client_executor.get());
        trConfig.s3Client = s3_client;


        trConfig.uploadProgressCallback =
            [](const Aws::Transfer::TransferManager*, const std::shared_ptr<const Aws::Transfer::TransferHandle>&transferHandle)
        { std::cout << "Upload Progress: " << transferHandle->GetBytesTransferred() <<
            " of " << transferHandle->GetBytesTotalSize() << " bytes" << std::endl;};

        std::cout << "File start upload" << std::endl;

        auto tranfer_manager = Aws::Transfer::TransferManager::Create(trConfig);
        auto transferHandle = tranfer_manager->UploadFile(object_name.c_str(),
            bucket_name.c_str(), key_name.c_str(), "multipart/form-data", Aws::Map<Aws::String, Aws::String>());

        transferHandle->WaitUntilFinished();

        if(transferHandle->GetStatus() == Aws::Transfer::TransferStatus::COMPLETED)
            std::cout << "File up" << std::endl;
        else
            std::cout << "Error uploading: " << transferHandle->GetLastError() << std::endl;
    }
    Aws::ShutdownAPI(options);
    return 0;
}

在AWS S3 c ++ SDK上上传图像文件花费的时间太长

1 个答案: