Switch to using the dep tool and update all the dependencies

vendor/github.com/aws/aws-sdk-go/service/dynamodb/customizations.go

@@ -0,0 +1,109 @@
+package dynamodb
+
+import (
+	"bytes"
+	"hash/crc32"
+	"io"
+	"io/ioutil"
+	"math"
+	"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"
+)
+
+type retryer struct {
+	client.DefaultRetryer
+}
+
+func (d retryer) RetryRules(r *request.Request) time.Duration {
+	delay := time.Duration(math.Pow(2, float64(r.RetryCount))) * 50
+	return delay * time.Millisecond
+}
+
+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 = retryer{
+		DefaultRetryer: client.DefaultRetryer{
+			NumMaxRetries: maxRetries,
+		},
+	}
+}
+
+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)
+	}
+}