Go?? io.WriterAt? ?? ??
aws-sdk? ???? Amazon S3?? ??? ????? ? ???? ??? ??? ????. io.WriterAt ?????? ???? ??? ?? ?? ?????. ??? Go? bytes.Buffer ??? ? ??? ???? ????.
? ??? ????? aws ???? aws.WriteAtBuffer ??? ???? ?? ????. ? ??? AWS SDK ??? ??? ?? ??? ?? ??? ???????.
??? aws.WriteAtBuffer? ???? S3 ??? ???? ?? ?????? ??? ?? ????.
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
func main() {
// Create a new session object with the default options.
sess := session.Must(session.NewSession())
// Create a new S3 client.
client := s3.New(sess)
// Prepare the request input with the bucket and key of the object to download.
requestInput := &s3.GetObjectInput{
Bucket: aws.String("my-bucket"),
Key: aws.String("my-file"),
}
// Create a new aws.WriteAtBuffer to receive the downloaded object data.
buf := aws.NewWriteAtBuffer([]byte{})
// Download the object into the buffer.
if _, err := client.GetObjectWithContext(context.Background(), requestInput, buf); err != nil {
fmt.Printf("Error downloading file: %v", err)
return
}
// Print the number of bytes downloaded.
fmt.Printf("Downloaded %v bytes", len(buf.Bytes()))
}
aws.WriteAtBuffer? ???? ?? ???? ?? ??? ??? S3 ??? ???? ?? ?? ????? ? ????.
? ??? Go?? ???? S3 ?? ????? ?? io.WriterAt? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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GO?? ?? ??? ???? ?? ??? lock () ? unlock () ???? sync.mutex? ???? ????. 1. ???? ???? ?? ? ???? ?? ??????. 2. ?? ??? ???? ?? Lock ()? ???? ??? ? ?? ? ?? ???? ??? ? ? ??? ??????. 3. Deferunlock ()? ???? ?? ??? ??? ?? ??? ?? ?????????. 4. ??? ????? ??? ???? ??? ?? ?????. 5. ? ?? ?? ? ?? ????? ????? ?? Sync.rwMutex? ?????? rlock ()/runlock ()? ?? ??? ?? Lock ()/unlock ()? ?? ??? ???? ??? ???? ??????.
