kubernetes aws_assumerole_provider 源码
kubernetes aws_assumerole_provider 代码
文件路径：/staging/src/k8s.io/legacy-cloud-providers/aws/aws_assumerole_provider.go
/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package aws
import (
"sync"
"time"
"github.com/aws/aws-sdk-go/aws/credentials"
)
const (
invalidateCredsCacheAfter = 1 * time.Second
)
// assumeRoleProviderWithRateLimiting makes sure we call the underlying provider only
// once after `invalidateCredsCacheAfter` period
type assumeRoleProviderWithRateLimiting struct {
provider credentials.Provider
invalidateCredsCacheAfter time.Duration
sync.RWMutex
lastError error
lastValue credentials.Value
lastRetrieveTime time.Time
}
func assumeRoleProvider(provider credentials.Provider) credentials.Provider {
return &assumeRoleProviderWithRateLimiting{provider: provider,
invalidateCredsCacheAfter: invalidateCredsCacheAfter}
}
func (l *assumeRoleProviderWithRateLimiting) Retrieve() (credentials.Value, error) {
l.Lock()
defer l.Unlock()
if time.Since(l.lastRetrieveTime) < l.invalidateCredsCacheAfter {
if l.lastError != nil {
return credentials.Value{}, l.lastError
}
return l.lastValue, nil
}
l.lastValue, l.lastError = l.provider.Retrieve()
l.lastRetrieveTime = time.Now()
return l.lastValue, l.lastError
}
func (l *assumeRoleProviderWithRateLimiting) IsExpired() bool {
return l.provider.IsExpired()
}
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