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main.go
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main.go
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package main
import (
"fmt"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/nikhil-thomas/technik-dojo/aws/gosdk/internal/errhndl"
)
func main() {
if len(os.Args) != 3 {
errhndl.ExitErrorf(
"Bucket and item names required\nusage: %s bucket_name object_name",
filepath.Base(os.Args[0]),
)
}
bucket := os.Args[1]
objectKey := os.Args[2]
region := os.Getenv("AWS_REGION")
sess, err := session.NewSession(&aws.Config{
Region: aws.String(region),
})
if err != nil {
errhndl.ExitErrorf("error in creating session %s\n", err)
}
downloader := s3manager.NewDownloader(sess)
file, err := os.Create(objectKey)
if err != nil {
errhndl.ExitErrorf("error in creating file %s\n", err)
}
defer file.Close()
numBytes, err := downloader.Download(
file,
&s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(objectKey),
},
)
if err != nil {
errhndl.ExitErrorf("error in downloading file %s\n", err)
}
fmt.Println("download successfull", file.Name(), "Size:", numBytes)
}