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// +build example
package main
import (
"fmt"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}
// Will make a request to S3 for the contents of an object. If the request
// was successful, and the object was found the object's path and size will be
// printed to stdout.
//
// If the object's bucket or key does not exist a specific error message will
// be printed to stderr for the error.
//
// Any other error will be printed as an unknown error.
//
// Usage: handleServiceErrorCodes <bucket> <key>
func main() {
if len(os.Args) < 3 {
exitErrorf("Usage: %s <bucket> <key>", filepath.Base(os.Args[0]))
}
sess := session.Must(session.NewSession())
svc := s3.New(sess)
resp, err := svc.GetObject(&s3.GetObjectInput{
Bucket: aws.String(os.Args[1]),
Key: aws.String(os.Args[2]),
})
if err != nil {
// Casting to the awserr.Error type will allow you to inspect the error
// code returned by the service in code. The error code can be used
// to switch on context specific functionality. In this case a context
// specific error message is printed to the user based on the bucket
// and key existing.
//
// For information on other S3 API error codes see:
// http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
if aerr, ok := err.(awserr.Error); ok {
switch aerr.Code() {
case s3.ErrCodeNoSuchBucket:
exitErrorf("bucket %s does not exist", os.Args[1])
case s3.ErrCodeNoSuchKey:
exitErrorf("object with key %s does not exist in bucket %s", os.Args[2], os.Args[1])
}
}
exitErrorf("unknown error occurred, %v", err)
}
defer resp.Body.Close()
fmt.Printf("s3://%s/%s exists. size: %d\n", os.Args[1], os.Args[2],
aws.Int64Value(resp.ContentLength))
}
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