使用 aws-sdk-go 在不创建文件的情况下将对象上传到 AWS S3

问题描述

我正在尝试使用 golang sdk 将对象上传到 AWS S3，而无需在我的系统中创建文件(尝试仅上传字符串).但我很难做到这一点.谁能给我举个例子，说明如何在不需要创建文件的情况下上传到 AWS S3?

I am trying to upload an object to AWS S3 using golang sdk without needing to create a file in my system (trying to upload only the string). But I am having difficulties to accomplish that. Can anybody give me an example of how can I upload to AWS S3 without needing to create a file?

AWS 上传文件的示例:

AWS Example of how to upload a file:

// Creates a S3 Bucket in the region configured in the shared config
// or AWS_REGION environment variable.
//
// Usage:
//    go run s3_upload_object.go BUCKET_NAME FILENAME
func main() {
    if len(os.Args) != 3 {
        exitErrorf("bucket and file name required\nUsage: %s bucket_name filename",
            os.Args[0])
    }

    bucket := os.Args[1]
    filename := os.Args[2]

    file, err := os.Open(filename)
    if err != nil {
        exitErrorf("Unable to open file %q, %v", err)
    }

    defer file.Close()

    // Initialize a session in us-west-2 that the SDK will use to load
    // credentials from the shared credentials file ~/.aws/credentials.
    sess, err := session.NewSession(&aws.Config{
        Region: aws.String("us-west-2")},
    )

    // Setup the S3 Upload Manager. Also see the SDK doc for the Upload Manager
    // for more information on configuring part size, and concurrency.
    //
    // http://docs.aws.amazon.com/sdk-for-go/api/service/s3/s3manager/#NewUploader
    uploader := s3manager.NewUploader(sess)

    // Upload the file's body to S3 bucket as an object with the key being the
    // same as the filename.
    _, err = uploader.Upload(&s3manager.UploadInput{
        Bucket: aws.String(bucket),

        // Can also use the `filepath` standard library package to modify the
        // filename as need for an S3 object key. Such as turning absolute path
        // to a relative path.
        Key: aws.String(filename),

        // The file to be uploaded. io.ReadSeeker is preferred as the Uploader
        // will be able to optimize memory when uploading large content. io.Reader
        // is supported, but will require buffering of the reader's bytes for
        // each part.
        Body: file,
    })
    if err != nil {
        // Print the error and exit.
        exitErrorf("Unable to upload %q to %q, %v", filename, bucket, err)
    }

    fmt.Printf("Successfully uploaded %q to %q\n", filename, bucket)
}

我已经尝试以编程方式创建文件，但它正在我的系统上创建文件，然后将其上传到 S3.

I already tried to create the file programmatically but it is creating the file on my system and then uploading it to S3.

推荐答案

结构只是一个 io.Reader.所以传递任何你想要的 io.Reader —— 它不需要是一个文件.

The Body field of the UploadInput struct is just an io.Reader. So pass any io.Reader you want--it doesn't need to be a file.

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