mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-09-29 15:24:12 +00:00
99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package dynamodb
|
|
|
|
import (
|
|
"bytes"
|
|
"hash/crc32"
|
|
"io"
|
|
"io/ioutil"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/aws/aws-sdk-go/aws"
|
|
"github.com/aws/aws-sdk-go/aws/awserr"
|
|
"github.com/aws/aws-sdk-go/aws/client"
|
|
"github.com/aws/aws-sdk-go/aws/request"
|
|
)
|
|
|
|
func init() {
|
|
initClient = func(c *client.Client) {
|
|
if c.Config.Retryer == nil {
|
|
// Only override the retryer with a custom one if the config
|
|
// does not already contain a retryer
|
|
setCustomRetryer(c)
|
|
}
|
|
|
|
c.Handlers.Build.PushBack(disableCompression)
|
|
c.Handlers.Unmarshal.PushFront(validateCRC32)
|
|
}
|
|
}
|
|
|
|
func setCustomRetryer(c *client.Client) {
|
|
maxRetries := aws.IntValue(c.Config.MaxRetries)
|
|
if c.Config.MaxRetries == nil || maxRetries == aws.UseServiceDefaultRetries {
|
|
maxRetries = 10
|
|
}
|
|
|
|
c.Retryer = client.DefaultRetryer{
|
|
NumMaxRetries: maxRetries,
|
|
MinRetryDelay: 50 * time.Millisecond,
|
|
}
|
|
}
|
|
|
|
func drainBody(b io.ReadCloser, length int64) (out *bytes.Buffer, err error) {
|
|
if length < 0 {
|
|
length = 0
|
|
}
|
|
buf := bytes.NewBuffer(make([]byte, 0, length))
|
|
|
|
if _, err = buf.ReadFrom(b); err != nil {
|
|
return nil, err
|
|
}
|
|
if err = b.Close(); err != nil {
|
|
return nil, err
|
|
}
|
|
return buf, nil
|
|
}
|
|
|
|
func disableCompression(r *request.Request) {
|
|
r.HTTPRequest.Header.Set("Accept-Encoding", "identity")
|
|
}
|
|
|
|
func validateCRC32(r *request.Request) {
|
|
if r.Error != nil {
|
|
return // already have an error, no need to verify CRC
|
|
}
|
|
|
|
// Checksum validation is off, skip
|
|
if aws.BoolValue(r.Config.DisableComputeChecksums) {
|
|
return
|
|
}
|
|
|
|
// Try to get CRC from response
|
|
header := r.HTTPResponse.Header.Get("X-Amz-Crc32")
|
|
if header == "" {
|
|
return // No header, skip
|
|
}
|
|
|
|
expected, err := strconv.ParseUint(header, 10, 32)
|
|
if err != nil {
|
|
return // Could not determine CRC value, skip
|
|
}
|
|
|
|
buf, err := drainBody(r.HTTPResponse.Body, r.HTTPResponse.ContentLength)
|
|
if err != nil { // failed to read the response body, skip
|
|
return
|
|
}
|
|
|
|
// Reset body for subsequent reads
|
|
r.HTTPResponse.Body = ioutil.NopCloser(bytes.NewReader(buf.Bytes()))
|
|
|
|
// Compute the CRC checksum
|
|
crc := crc32.ChecksumIEEE(buf.Bytes())
|
|
|
|
if crc != uint32(expected) {
|
|
// CRC does not match, set a retryable error
|
|
r.Retryable = aws.Bool(true)
|
|
r.Error = awserr.New("CRC32CheckFailed", "CRC32 integrity check failed", nil)
|
|
}
|
|
}
|