120 lines
3 KiB
Go
120 lines
3 KiB
Go
package ec2
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import (
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awsutil"
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"github.com/aws/aws-sdk-go/aws/client"
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"github.com/aws/aws-sdk-go/aws/endpoints"
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"github.com/aws/aws-sdk-go/aws/request"
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"github.com/aws/aws-sdk-go/internal/sdkrand"
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)
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type retryer struct {
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client.DefaultRetryer
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}
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func (d retryer) RetryRules(r *request.Request) time.Duration {
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switch r.Operation.Name {
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case opModifyNetworkInterfaceAttribute:
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fallthrough
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case opAssignPrivateIpAddresses:
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return customRetryRule(r)
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default:
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return d.DefaultRetryer.RetryRules(r)
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}
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}
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func customRetryRule(r *request.Request) time.Duration {
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retryTimes := []time.Duration{
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time.Second,
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3 * time.Second,
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5 * time.Second,
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}
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count := r.RetryCount
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if count >= len(retryTimes) {
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count = len(retryTimes) - 1
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}
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minTime := int(retryTimes[count])
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return time.Duration(sdkrand.SeededRand.Intn(minTime) + minTime)
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}
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func setCustomRetryer(c *client.Client) {
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maxRetries := aws.IntValue(c.Config.MaxRetries)
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if c.Config.MaxRetries == nil || maxRetries == aws.UseServiceDefaultRetries {
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maxRetries = 3
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}
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c.Retryer = retryer{
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DefaultRetryer: client.DefaultRetryer{
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NumMaxRetries: maxRetries,
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},
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}
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}
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func init() {
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initClient = func(c *client.Client) {
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if c.Config.Retryer == nil {
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// Only override the retryer with a custom one if the config
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// does not already contain a retryer
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setCustomRetryer(c)
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}
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}
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initRequest = func(r *request.Request) {
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if r.Operation.Name == opCopySnapshot { // fill the PresignedURL parameter
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r.Handlers.Build.PushFront(fillPresignedURL)
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}
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}
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}
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func fillPresignedURL(r *request.Request) {
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if !r.ParamsFilled() {
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return
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}
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origParams := r.Params.(*CopySnapshotInput)
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// Stop if PresignedURL/DestinationRegion is set
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if origParams.PresignedUrl != nil || origParams.DestinationRegion != nil {
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return
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}
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origParams.DestinationRegion = r.Config.Region
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newParams := awsutil.CopyOf(r.Params).(*CopySnapshotInput)
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// Create a new request based on the existing request. We will use this to
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// presign the CopySnapshot request against the source region.
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cfg := r.Config.Copy(aws.NewConfig().
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WithEndpoint("").
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WithRegion(aws.StringValue(origParams.SourceRegion)))
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clientInfo := r.ClientInfo
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resolved, err := r.Config.EndpointResolver.EndpointFor(
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clientInfo.ServiceName, aws.StringValue(cfg.Region),
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func(opt *endpoints.Options) {
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opt.DisableSSL = aws.BoolValue(cfg.DisableSSL)
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opt.UseDualStack = aws.BoolValue(cfg.UseDualStack)
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},
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)
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if err != nil {
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r.Error = err
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return
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}
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clientInfo.Endpoint = resolved.URL
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clientInfo.SigningRegion = resolved.SigningRegion
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// Presign a CopySnapshot request with modified params
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req := request.New(*cfg, clientInfo, r.Handlers, r.Retryer, r.Operation, newParams, r.Data)
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url, err := req.Presign(5 * time.Minute) // 5 minutes should be enough.
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if err != nil { // bubble error back up to original request
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r.Error = err
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return
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}
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// We have our URL, set it on params
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origParams.PresignedUrl = &url
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}
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