traefik/vendor/github.com/aws/aws-sdk-go/service/ec2/customizations.go
2018-02-22 14:58:04 +01:00

120 lines
3 KiB
Go

package ec2
import (
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awsutil"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/internal/sdkrand"
)
type retryer struct {
client.DefaultRetryer
}
func (d retryer) RetryRules(r *request.Request) time.Duration {
switch r.Operation.Name {
case opModifyNetworkInterfaceAttribute:
fallthrough
case opAssignPrivateIpAddresses:
return customRetryRule(r)
default:
return d.DefaultRetryer.RetryRules(r)
}
}
func customRetryRule(r *request.Request) time.Duration {
retryTimes := []time.Duration{
time.Second,
3 * time.Second,
5 * time.Second,
}
count := r.RetryCount
if count >= len(retryTimes) {
count = len(retryTimes) - 1
}
minTime := int(retryTimes[count])
return time.Duration(sdkrand.SeededRand.Intn(minTime) + minTime)
}
func setCustomRetryer(c *client.Client) {
maxRetries := aws.IntValue(c.Config.MaxRetries)
if c.Config.MaxRetries == nil || maxRetries == aws.UseServiceDefaultRetries {
maxRetries = 3
}
c.Retryer = retryer{
DefaultRetryer: client.DefaultRetryer{
NumMaxRetries: maxRetries,
},
}
}
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)
}
}
initRequest = func(r *request.Request) {
if r.Operation.Name == opCopySnapshot { // fill the PresignedURL parameter
r.Handlers.Build.PushFront(fillPresignedURL)
}
}
}
func fillPresignedURL(r *request.Request) {
if !r.ParamsFilled() {
return
}
origParams := r.Params.(*CopySnapshotInput)
// Stop if PresignedURL/DestinationRegion is set
if origParams.PresignedUrl != nil || origParams.DestinationRegion != nil {
return
}
origParams.DestinationRegion = r.Config.Region
newParams := awsutil.CopyOf(r.Params).(*CopySnapshotInput)
// Create a new request based on the existing request. We will use this to
// presign the CopySnapshot request against the source region.
cfg := r.Config.Copy(aws.NewConfig().
WithEndpoint("").
WithRegion(aws.StringValue(origParams.SourceRegion)))
clientInfo := r.ClientInfo
resolved, err := r.Config.EndpointResolver.EndpointFor(
clientInfo.ServiceName, aws.StringValue(cfg.Region),
func(opt *endpoints.Options) {
opt.DisableSSL = aws.BoolValue(cfg.DisableSSL)
opt.UseDualStack = aws.BoolValue(cfg.UseDualStack)
},
)
if err != nil {
r.Error = err
return
}
clientInfo.Endpoint = resolved.URL
clientInfo.SigningRegion = resolved.SigningRegion
// Presign a CopySnapshot request with modified params
req := request.New(*cfg, clientInfo, r.Handlers, r.Retryer, r.Operation, newParams, r.Data)
url, err := req.Presign(5 * time.Minute) // 5 minutes should be enough.
if err != nil { // bubble error back up to original request
r.Error = err
return
}
// We have our URL, set it on params
origParams.PresignedUrl = &url
}