// Read a single client record using a partial read from S3 using the given
// headers, which should contain a "Range: bytes=M-N" header.
func getClientRecord(bucket *s3.Bucket, o *MessageLocation, headers map[string][]string) ([]byte, error) {
resp, err := bucket.GetResponseWithHeaders(o.Key, headers)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err == nil && len(body) != int(o.Length) {
err = fmt.Errorf("Unexpected body length: %d != %d\n", len(body), o.Length)
}
return body, err
}
// Callers must call Close() on rc.
func getS3Reader(bucket *s3.Bucket, s3Key string, offset uint64) (rc io.ReadCloser, err error) {
if offset == 0 {
rc, err = bucket.GetReader(s3Key)
return
}
headers := map[string][]string{
"Range": []string{fmt.Sprintf("bytes=%d-", offset)},
}
resp, err := bucket.GetResponseWithHeaders(s3Key, headers)
if resp != nil {
rc = resp.Body
}
return
}