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97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package aws
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import (
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"sync"
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"k8s.io/klog"
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"k8s.io/apimachinery/pkg/util/sets"
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)
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// wellKnownRegions is the complete list of regions known to the AWS cloudprovider
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// and credentialprovider.
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var wellKnownRegions = [...]string{
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// from `aws ec2 describe-regions --region us-east-1 --query Regions[].RegionName | sort`
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"ap-northeast-1",
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"ap-northeast-2",
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"ap-northeast-3",
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"ap-south-1",
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"ap-southeast-1",
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"ap-southeast-2",
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"ca-central-1",
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"eu-central-1",
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"eu-west-1",
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"eu-west-2",
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"eu-west-3",
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"sa-east-1",
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"us-east-1",
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"us-east-2",
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"us-west-1",
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"us-west-2",
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// these are not registered in many / most accounts
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"cn-north-1",
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"cn-northwest-1",
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"us-gov-west-1",
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}
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// awsRegionsMutex protects awsRegions
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var awsRegionsMutex sync.Mutex
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// awsRegions is a set of recognized regions
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var awsRegions sets.String
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// recognizeRegion is called for each AWS region we know about.
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// It currently registers a credential provider for that region.
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// There are two paths to discovering a region:
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// * we hard-code some well-known regions
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// * if a region is discovered from instance metadata, we add that
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func recognizeRegion(region string) {
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awsRegionsMutex.Lock()
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defer awsRegionsMutex.Unlock()
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if awsRegions == nil {
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awsRegions = sets.NewString()
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}
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if awsRegions.Has(region) {
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klog.V(6).Infof("found AWS region %q again - ignoring", region)
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return
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}
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klog.V(4).Infof("found AWS region %q", region)
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awsRegions.Insert(region)
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}
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// recognizeWellKnownRegions calls RecognizeRegion on each WellKnownRegion
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func recognizeWellKnownRegions() {
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for _, region := range wellKnownRegions {
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recognizeRegion(region)
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}
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}
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// isRegionValid checks if the region is in the set of known regions
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func isRegionValid(region string) bool {
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awsRegionsMutex.Lock()
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defer awsRegionsMutex.Unlock()
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return awsRegions.Has(region)
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}
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